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30results about How to "Initiation temperature is low" patented technology
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Process for synthesizing acrylic ester copolymer of ultra-high molecular mass
The invention relates to a synthesis method of acrylic ester copolymer with ultra-high molecular weight (more than 6 million). The technical problem to be solved by the invention is to provide a method with multistage reaction and higher efficiency. The method comprises the following steps: (1) preparation of a seed emulsion: adding a portion weight of water and two or more unsaturated monomers with olefinic bonds, wherein the weight ratio of water to the monomers is 1:0.6 to 1; adding an emulsifying agent and a pH buffer, and adding a portion weight of or the total weight of one or two oxidants and one or two reducers to carry out reaction completely, wherein the weight ratio of the oxidant to the reducer is 1:0.7 to 1.5; and (2) multistage polymerization reaction: adding unsaturated monomers with olefinic bonds in balancing amount in multiple stages after rising the temperature, keeping the temperature at 45 to 65 DEG C, adding the balancing amount of water in multiple stages, rising the temperature to 80 to 85 DEG C, and adding the balancing amount of the oxidant and the reducer.
Owner:安丘市东海塑业有限公司
High-adaptability multi-branched-chain amide imine type polycarboxylate based water reducer and preparation method thereof
InactiveCN108912279AImprove rigidity and flexibilityHigh water reduction rateFunctional monomerMacromonomer
The invention relates to a high-adaptability multi-branched-chain amide imine type polycarboxylate based water reducer and a preparation method thereof, and belongs to the technical field of concreteadditives. The polycarboxylate based water reducer is composed of the following substances: polyether macromonomers, unsaturated acid monomers, branched-chain functional monomer methoxy polyethylene glycol mercaptoacetate, amide imine type functional monomer diethylenetriamine maleate, an initiator, a reducing agent and deionized water, wherein the molar ratio of the polyether macromonomers to theunsaturated acid monomers to the branched-chain monomers to the amide imine type monomers is 1:(2-5):(0.3-0.6):(0.5-1.0). The prepared water reducer has a relatively high water reducing rate and excellent slump retaining performance, and the problem of adaptability between cement concrete and the polycarboxylate based water reducer is also solved. The invention further provides a preparation method thereof. The preparation method comprises four steps, is scientific and reasonable, and is simple and feasible.
Owner:SHANDONG VOCATIONAL COLLEGE OF LIGHT IND
Method for preparing super absorbent resin by grafting and copolymerizing carboxymethyl potato pulp
The invention discloses a method for preparing super absorbent resin by grafting and copolymerizing carboxymethyl potato pulp. The main process is as follows: under ice-water bath cooling, carrying out neutralization reaction by using sodium hydroxide liquor and polymerization inhibitor-removed acrylic acid, adding neutralized liquor into a reaction container which contains carboxymethyl potato pulp, acrylamide, potassium persulfate, sodium hydrogen sulfite, N, N'- methylene bisacrylamide and deionized water for sufficiently mixing uniformly, stirring under nitrogen gas protection, heating in water bath, stopping stirring while heating to 25-45 DEG C, preserving heat for 2 hours in boiling water bath, then stopping ventilating nitrogen gas, taking out a product and shearing the product into small blocks, drying in an oven of 40 DEG C-60 DEG C until weight is constant, crushing to obtain a product. Compared with water-absorbent resin on the market, the super absorbent resin prepared by the method disclosed by the invention has water absorption capacity which is greatly improved, and low preparation cost, and therefore, the method has a very good application prospect in water retention of arid area soil, desert prevention and treatment, gardening of agriculture and forestry, and the like.
Owner:INNER MONGOLIA UNIVERSITY
Efficient slump retaining agent and preparation method thereof
PendingCN111440273AImprove workabilityImprove strength reductionPolymer science(Hydroxyethyl)methacrylate
The invention discloses an efficient slump retaining agent, which is prepared from the following components in parts by weight: 250-600 parts of a monomer A, 11-40 parts of a monomer B, 20-60 parts ofa monomer C, 5-15 parts of a monomer D, 1-20 parts of an initiator, 0.8-10 parts of a composite molecular weight regulator, 0.5-4 parts of vitamin C sodium and 300-700 parts of water, wherein the monomer A is any one or a mixture of more of isopentenyl polyethylene glycol ether, hydroxybutyl vinyl polyethylene glycol ether and ethoxy vinyl polyethylene glycol ether, the monomer B is any one or amixture of two of acrylic acid, fumaric acid, itaconic acid and maleic anhydride, the monomer C is any one or a mixture of more of hydroxyethyl acrylate, hydroxypropyl acrylate, methacryloyloxy phosphate and hydroxyethyl methacrylate, the monomer D is diacrylamide dimethyl propanesulfonic acid or acrylamide, and the composite molecular weight regulator is mercaptoethanol. The components are subjected to a stirring reaction to obtain the product. The efficient slump retaining agent provided by the invention is good in slump retaining performance, small in performance fluctuation and excellent in adaptability, and can effectively meet the slump retaining requirements of concrete in various regions.
Owner:CHONGQING SANSHENG IND CO LTD
Method for preparing nitrogen and potassium contained superabsorbent resin from carboxymethyl potato residues
The invention discloses a method for preparing nitrogen and potassium contained superabsorbent resin from carboxymethyl potato residues. The method comprises the main process steps of enabling a potassium hydroxide solution and polymerization inhibitor removed acrylic acid to be subjected to neutralization reaction under the cooling of ice-water bath; adding the neutralized solution into a reaction vessel filled with carboxymethyl potato residues, acrylamide, potassium persulfate, sodium hydrogen sulfite, N, N'-methylenebisacrylamide and deionized water; stirring under the protection of nitrogen gas, heating in water bath, stopping stirring at the temperature of 25-45 DEG C, and preserving heat in boiling water bath for 1-2h; then, stopping introducing nitrogen gas, taking out a product, shearing the product into small blocks, drying the small blocks in a drying oven with the temperature of 40-60 DEG C until the weights of the small blocks are constant, and smashing to obtain the nitrogen and potassium contained superabsorbent resin prepared from carboxymethyl potato residues. Compared with the like product, the superabsorbent resin prepared by using the method disclosed by the invention is greatly improved in water absorbing capacity, low in preparation cost and favorable in application prospect on the aspects such as water retention of soil in drought regions, desert control, plant growth and the like.
Owner:INNER MONGOLIA UNIVERSITY
Bio-based pentamethylene diisocyanate curing agent as well as preparation method and application thereof
ActiveCN112079979AReduce viscosityLight shadeOrganic chemistryPolyurea/polyurethane coatingsPolymer sciencePtru catalyst
The invention relates to a method for preparing polyisocyanate containing allophanate and isocyanurate groups, in particular to a bio-based pentamethylene diisocyanate curing agent as well as a preparation method and application thereof. The preparation method of the bio-based pentamethylene diisocyanate curing agent provided by the invention can be used for preparing a polyisocyanate curing agentcontaining allophanate and isocyanurate groups, and comprises the following steps: mixing a PDI monomer with a hydrolytic chlorine concentration of 0-50ppm with a catalyst A, carrying out pre-reaction for 0-5h, diluting a PDI tripolymer catalyst with a mixed solvent (a solvent B and a solvent C), dropwise adding the PDI tripolymer catalyst at a constant speed section by sections, carrying out polymerization reaction, adding a polymerization inhibitor to terminate the reaction when the conversion rate reaches 30%-40%, adding an antioxidant D, and carrying out two-stage separation by virtue ofa film evaporator and a molecular distiller to obtain a PDI-type polyisocyanate composition.The residual PDI monomer in the product is 0.5% or below, viscosity is low, and color is light. Meanwhile, the curing agent has good compatibility with hydroxyl resin, and has the advantages of being high in reaction activity, high in glossiness, good in chemical medium resistance and the like.
Owner:CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
Fluorescently-labeled polyacrylamide, and preparation method and application thereof as visual soil structure improver
InactiveCN111205391AStable decomposition reactionControllable decomposition reactionAgriculture tools and machinesOrganic fertilisersMeth-Soil science
The invention discloses fluorescently-labeled polyacrylamide, and a preparation method and application thereof as a visual soil structure improver. The method comprises the steps: initiating an acrylamide monomer and a modified fluorescent monomer FL (4-(N'-methyl-1-piperazinyl)-N-propyl-1,8-naphthalenedicarbonyl allyl chloride quaternary ammonium salt) by using an initiator, and carrying out freeradical copolymerization reaction to generate the fluorescently-labeled polyacrylamide. The material can emit macroscopic green fluorescence under the excitation of ultraviolet light. When the material is applied to soil, the migration of polyacrylamide in the soil can be visualized, and a method is provided for subsequent research on the action of polyacrylamide in the soil. Polyacrylamide contains a large number of amide groups, and can adsorb soil particles due to hydrogen bond interaction, so that tiny particles in polyacrylamide are aggregated into stable large aggregates, the volume weight of soil is reduced, soil hardening and water and soil loss are effectively prevented and treated, and a good soil improvement effect is achieved.
Owner:SOUTH CHINA UNIV OF TECH
Free radical, moisture and UV triple curable sealant and preparation method thereof
InactiveCN110951447AInitiation temperature is lowReduce the temperatureNon-macromolecular adhesive additivesMacromolecular adhesive additivesSilicone resinCarbon black
The invention relates to a free radical, moisture and UV triple curable sealant. The free radical, moisture and UV triple curable sealant is a single-component adhesive, wherein a functional MQ resin,a functional methyl silicone oil, a silane coupling agent, spherical hollow glass beads, white carbon black, a peroxide catalyst, a moisture curing catalyst, a UV curing catalyst and a black color paste are mixed according to the weight ratio of (20-35): (40-50): (3-7): (10-15): (4-15): (3-9): (1-6): (0.5-4): (0.02-0.1). The adopted functional MQ resin and functional methyl silicone oil can reduce the peroxide initiation temperature of traditional vinyl silicone resin and vinyl silicone oil; moisture curing and UV curing can make up the defect of incomplete curing caused by inhibition of oxygen on peroxide curing from multiple aspects; due to the introduction of the spherical hollow glass beads, the glue density is reduced, and a promising application prospect in the field of pursuing light-weight devices is achieved.
Owner:YANTAI DARBOND TECH
Preparation method of ethylene-tetrafluoroethylene copolymer resin
The invention relates to a method for preparing ethylene-tetrafluoroethylene copolymer resin by utilizing an inorganic oxidation-reduction system, which solves the technical problems of high initiation temperature of inorganic peroxides and adverse influence on alternating structures, and belongs to the technical field of fluoroplastics. The method is characterized in that an independent gas-mixing tank and a pressurizing system of the gas-mixing tank are arranged, and the gas-mixing tank and a reaction kettle are connected through a check valve, so that gas can only flow from the mixing groove to the reaction kettle in a unidirectional manner; during polymerization reaction, the temperature is reduced to 10 DEG C and is kept constant, the following monomer is added and supplied in the form of mixed gas, and constant pressure is kept in the kettle; and the polymerization reaction adopts an ammonium persulfate-ferrisulphas inorganic redox initiation system. The method has the beneficial effects that the initiation temperature of the inorganic peroxides is lowered, the prepared copolymer resin is in an alternating copolymer structure, radiation-resisting and mechanical performances are improved to a great degree while the good performance of PTFE (Polytetrafluoroethylene) is kept, and the tensile strength can reach 50MPa which is approximately twice as that of the PTFE.
Owner:泰兴梅兰新材料有限公司
Scale inhibitor dispersant for circulating cooling water system and preparation method thereof
ActiveCN103833150BGood dispersionResidue reductionScale removal and water softeningPOLYOXYETHYLENE ETHERCalcium carbonate
The invention discloses a dirt dispersion agent for a circulating cooling water system and a preparation method of the dirt dispersion agent. The dirt dispersion agent is a terpolymer formed by copolymerizing three monomers such as maleic anhydride, allyl ether and hydroxyl compound by adopting an aqueous solution free radical polymerization method; the mass ratio of the maleic anhydride to the allyl ether to the hydroxyl compound is (1-1.5):(0.5-1):(0.2-0.5); the allyl ether is allyl polyoxyethylene ether, the hydroxyl compound is one or mixture of more than one of hydroxy-propyl acrylate, hydroxyethyl acrylate and sodium 3-allyloxy-2-hydroxy-1-propanesulfonate. The dirt dispersion agent disclosed by the invention is the terpolymer of maleic anhydride, allyl ether and hydroxyl compound, contains carboxy, ether and hydroxy functional groups; the dirt dispersion agent not only has excellent performance preventing calcium carbonate scale, calcium sulfate scale and calcium phosphate scale, but also has good zinc-stabilizing and ferric oxide dispersion capacity.
Owner:CHANGZHOU KEWEI TIANSHI ENVIRONMENTAL TECH
Method for Polymerization of Acrylamide Using Ultrasonic Technology
The invention belongs to the field of polymer synthesis, and particularly relates to a preparation method for activating a polymerization monomer and an initiator by an ultrasonic treatment technology to prepare instant ultrahigh-intrinsic viscosity anionic polyacrylamide dry powder. The preparation method comprises the following steps: performing ultrasonic activation treatment on deionized water, an aqueous acrylamide solution, sodium carbonate, a cosolvent and a chain transfer agent, and adding the initiator treated by ultrasonic activation for performing polymerization reaction. Through ultrasonic treatment on the raw materials and the initiator, activity of an acrylamide monomer and the initiator are enhanced, the amount of the initiator required during polymerization is reduced, the initiating temperature is lower, and an obtained polymer has higher intrinsic viscosity and better solubility.
Owner:CHINA PETROLEUM & CHEM CORP
Method for preparing superabsorbent resin by graft copolymerization of carboxymethyl potato residue
The invention discloses a method for preparing super absorbent resin by grafting and copolymerizing carboxymethyl potato pulp. The main process is as follows: under ice-water bath cooling, carrying out neutralization reaction by using sodium hydroxide liquor and polymerization inhibitor-removed acrylic acid, adding neutralized liquor into a reaction container which contains carboxymethyl potato pulp, acrylamide, potassium persulfate, sodium hydrogen sulfite, N, N'- methylene bisacrylamide and deionized water for sufficiently mixing uniformly, stirring under nitrogen gas protection, heating in water bath, stopping stirring while heating to 25-45 DEG C, preserving heat for 2 hours in boiling water bath, then stopping ventilating nitrogen gas, taking out a product and shearing the product into small blocks, drying in an oven of 40 DEG C-60 DEG C until weight is constant, crushing to obtain a product. Compared with water-absorbent resin on the market, the super absorbent resin prepared by the method disclosed by the invention has water absorption capacity which is greatly improved, and low preparation cost, and therefore, the method has a very good application prospect in water retention of arid area soil, desert prevention and treatment, gardening of agriculture and forestry, and the like.
Owner:INNER MONGOLIA UNIVERSITY
Method for preparing nitrogen-containing potassium superabsorbent resin from carboxymethyl potato residue
Owner:INNER MONGOLIA UNIVERSITY
Preparation method of poly dialkyl diallyl ammonium halide
InactiveCN100543047CHigh molecular weightThe preparation process has good stabilityPolymer scienceDecomposition
The invention discloses a preparation method of polydialkyl diallyl ammonium halide. It uses the monomer dialkyldiallyl ammonium halide produced by the high-purity industrial one-step method with known main impurity content as the raw material. A step-by-step method of slowly initiating polymerization and high-temperature aging to increase the relative molecular mass of the product polydialkyl diallyl ammonium halide. At the same time, only by adjusting the initial monomer content and the amount of initiator in the reaction system to control the relative molecular weight of the product to achieve serialization. The invention has industrial application prospects, and because the polymerization reaction is less affected by impurities, the preparation process has good stability; the initiation temperature is lowered, and the polymerization reaction is easy to operate at a lower temperature; the rate of decomposition and initiation of the initiator is controlled, and the polymerization The reaction proceeds smoothly at a lower initiator concentration, and it is easy to obtain polydialkyldiallyl ammonium halide products with higher relative molecular weight.
Owner:NANJING UNIV OF SCI & TECH
Preparation method of colorless transparent sodium polyacrylate dispersing agent
ActiveCN111454385AControl reaction molecular weightSmooth responseBenzoyl peroxideUltraviolet lights
The invention discloses a preparation method of a colorless transparent sodium polyacrylate dispersing agent, which comprises the following steps: initiating polymerization under the assistance of light in the initial stage of polymerization to synthesize low-molecular-weight polyacrylic acid, continuously irradiating ultraviolet light or visible light in the process of neutralizing the polyacrylic acid with sodium hydroxide, and finally, adding a certain amount of benzoyl peroxide into the synthesized polymer to achieve corresponding decolorization and corrosion prevention effects. The sodiumpolyacrylate dispersing agent prepared by the invention is in a colorless and transparent state, the chromaticity of the sodium polyacrylate dispersing agent is excellent by adopting a spectrophotometer, and the sodium polyacrylate dispersing agent achieves a good effect in the application field. The dispersing agent is simple in preparation method and low in cost, and has the characteristics ofstable product performance and good dispersing performances.
Owner:SNF CHINA FLOCCULANT
Polymerizing process for preparing nano microcapsule by radiating emulsion
A radiating polymerization process for preparing nano microcapsules includes such steps as proportioning core, monomer, emulsifier and water, mixing core with monomer, adding emulsifier and water, strong stirring for 15-45 min, high-energy ray radiating while aerating nitrogen gas for polymerizing reaction for 5-6 hr, filtering, and neutralizing to 5-7 of pH value with diluted ammonia solution.
Owner:南京中脉科技发展有限公司
Preparation method of poly dialkyl diallyl ammonium halide
InactiveCN101081884AHigh molecular weightThe preparation process has good stabilityHigh-temperature corrosionReaction system
The present invention discloses preparation process of polyammonium dialkyldiallyl halide. By using ammonium dialkyldiallyl halide with high purity as material, and through adding initiator and complexing agent at relatively low temperature and stepped temperature raising for slow polymerization and high temperature curing, polyammonium dialkyldiallyl halide with relatively high molecular weight is prepared. The molecular weight is regulated through regulating the initial monomer content and initiator amount in the reaction system. The process has industrial application foreground, high technological stability, easy operation and other advantages, and the product has relatively high molecular weight.
Owner:NANJING UNIV OF SCI & TECH
Methyl methacrylate and butyl methacrylate bicontinuous emulsion copolymerized porous material and preparation method thereof
The invention discloses a preparation method of a methyl methacrylate and butyl methacrylate bicontinuous emulsion copolymerized porous material, wherein the preparation method comprises the following steps: (1) assembling a reaction device, and deoxygenating the reaction device; (2) adding sodium persulfate, lauryl sodium sulfate, alkylphenol ethoxylates and water into the reaction device, and mixing and stirring to prepare a mixed solution a; (3) adding MMA and BMA into the mixed solution a, and then mixing and stirring to prepare a mixed solution b; (4) connecting a power supply to carry out electrochemical polymerization on the mixed solution b to prepare a primary product; (5) carrying out standing treatment on the primary product to prepare a standing product; and (6) taking out the standing product, carrying out demulsification treatment, carrying out suction filtration, and drying to obtain the product. Compared with the prior art, the material and the preparation method thereof have the following advantages: (1) the initiation temperature is low, and heat energy is easy to evacuate; (2) preparation is convenient, and time control is accurate; and (3) the controllability of the polymerization degree of the product can be enhanced.
Owner:广西产研院新型功能材料研究所有限公司 +1
Method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose
The invention discloses a method for preparing nitrogen and potassium-containing super absorbent resin from carboxymethyl sorghum cellulose, which comprises the following steps: S1, mixing acrylic acid and potassium persulfate for neutralization reaction to obtain an acrylic acid and acrylic acid potassium salt solution; S2, mixing the carboxymethyl sorghum cellulose with acrylamide, an oxidizing agent, a cross-linking agent, the acrylic acid and acrylic acid salt solution and a reducing agent, introducing nitrogen, carrying out a stirring reaction, and stopping stirring when the temperature is raised to 25-35 DEG C; and S3, conducting heating to 95-100 DEG C, carrying out heat preservation for 1.5-2.5 h, stopping introducing nitrogen, and conducting cooling to obtain the nitrogen and potassium-containing super absorbent resin. The water absorption performance and the water retention performance of the super absorbent resin prepared by the method are 2-3 times of those of similar products in the current market, the process is low in preparation cost, and the super absorbent resin has huge application prospects in the industries of soil moisture retention, desert control, agriculture and forestry, flower transportation and the like.
Owner:WEIFANG UNIV OF SCI & TECH
Method for preparing super absorbent resin from sorghum straws
The invention discloses a method for preparing super absorbent resin from sorghum straws, the method comprises the following steps: S1, soaking crushed sorghum straw powder in a low-concentration alkali solution, then adding a high-concentration alkali solution for alkalization reaction, and then adding sodium chloroacetate and the high-concentration alkali solution for etherification reaction to obtain carboxymethyl sorghum cellulose; s2, mixing acrylic acid and a neutralizer for a neutralization reaction, and obtaining acrylic acid and a salt solution thereof; s3, mixing the carboxymethyl sorghum cellulose with an oxidizing agent, a cross-linking agent, acrylic acid, a salt solution of the acrylic acid and a reducing agent, introducing nitrogen, and carrying out a stirring reaction; and S4, after the reaction is finished, heating and carrying out heat preservation. The water absorption performance and the water retention performance of the super absorbent resin prepared by the method are 2-3 times of those of similar products in the current market, and the water absorption is up to 1250-1550g / g. The method is simple in process and low in preparation cost, and has huge application prospects in the industries of soil moisture retention, desert control, agriculture and forestry, flower transportation and the like.
Owner:WEIFANG UNIV OF SCI & TECH
Preparation method of poly dimethyl allyl ammonium chloride
The invention discloses a preparation method of polydimethyl diallyl ammonium chloride. It is based on the industrial cationic monomer DMDAAC aqueous solution obtained by a high-yield one-step clean preparation process as a raw material, adding persulfate as an initiator and Na4EDTA complexing agent at one time, controlling the reaction temperature under stirring, and controlling the initiation rate according to gradient temperature rise , initiate the polymerization reaction of monomer DMDAAC at a lower temperature, increase the degree of polymerization of the product PDMDAAC, improve the relative molecular weight, add an aqueous solution containing a small amount of initiator at a higher temperature in the later stage of the reaction to improve the monomer conversion rate in the product, and finally By controlling the amount of dilution water added, the solid content of the product is adjusted. The present invention is not only easy to obtain polymer products with higher relative molecular weight, but also has good economical and industrial bases for its preparation method; the initiation temperature is reduced, and the polymerization reaction is carried out under relatively mild conditions, which is easy to operate and low in production cost; PDMDAAC products with different solid contents and different uses can be obtained.
Owner:NANJING UNIV OF SCI & TECH
Polymerizing process for preparing nano microcapsule by radiating emulsion
A radiating polymerization process for preparing nano microcapsules includes such steps as proportioning core, monomer, emulsifier and water, mixing core with monomer, adding emulsifier and water, strong stirring for 15-45 min, high-energy ray radiating while aerating nitrogen gas for polymerizing reaction for 5-6 hr, filtering, and neutralizing to 5-7 of pH value with diluted ammonia solution.
Owner:南京中脉科技发展有限公司
A kind of drilling fluid flow pattern regulator and its preparation method
ActiveCN106496408BReduce dosageInitiation temperature is lowDrilling compositionHigh resistanceFunctional monomer
The invention provides a drilling fluid flow pattern regulating agent and a preparation method thereof. The drilling fluid flow pattern regulating agent is formed by copolymerization of acrylamide, acrylate and organic functional monomers under the action of initiators and catalysts. The organic functional monomers are mixtures of 2-acrylamide-2-methylpropane sulfonic acid and acryloyloxyethyl trimethyl ammonium chloride. The catalysts are transition metal catalysts. The mass ratio of the acrylamide to the acrylate to the organic functional monomers is (13-15):(2-4):(3-9). The drilling fluid flow pattern regulating agent and the preparation method thereof have the advantages that the drilling fluid flow pattern regulating agent has high resistance to salt, grease and other contamination, high inhibition capability, good anti-sloughing effect, low content of inferior solid phases and high lubricity, can meet naturally-built inclined shafts and directional wells both with hole drift angles smaller than 20 degrees, has high temperature resistance, and can enable temperature resistance of saline drilling fluid systems to reach above 150 DEG C.
Owner:CHINA PETROCHEMICAL CORP +2
Bio-based pentamethylene diisocyanate curing agent and preparation method and application thereof
ActiveCN112079979BReduce viscosityLight shadeOrganic chemistryPolyurea/polyurethane coatingsPolymer sciencePtru catalyst
The invention relates to a method for preparing a polyisocyanate containing allophanate and isocyanurate groups, in particular to a bio-based pentamethylene diisocyanate curing agent and a preparation method and application thereof. The preparation method of the bio-based pentamethylene diisocyanate curing agent provided by the present invention can prepare the polyisocyanate curing agent containing allophanate and isocyanurate groups. The concentration of hydrolyzed chlorine is 0-50ppm. After the PDI monomer and the catalyst A are mixed, pre-react for 0~5h, the PDI trimer catalyst is added dropwise at a constant speed under the dilution of the mixed solvent (solvent B and solvent C), and the polymerization reaction is carried out, and the conversion rate reaches 30%- 40%, add polymerization inhibitor to terminate the reaction, add antioxidant D, and obtain PDI type polyisocyanate composition through two-stage separation of thin film evaporator and molecular still, the residual PDI monomer in the product is ≤ 0.5%, the viscosity is low, Light color, good compatibility with hydroxyl resin, high reactivity, high gloss, good chemical resistance and so on.
Owner:CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +2
Polylactic acid injection molding method
PendingCN113461880AGuaranteed processing effectEnsure transparencyCoatingsPolymer scienceDepolymerization
The invention relates to a polylactic acid injection molding method which comprises the following steps: step 1, preliminary polycondensation of lactic acid: dehydrating lactic acid, and then performing polycondensation under the catalytic action of a first catalyst to obtain a preliminary polylactic acid polymer; step 2, primary polymer depolymerization: carrying out depolymerization treatment on the polylactic acid primary polymer to obtain a polylactic acid prepolymer; step 3, ring opening and block polymerization: carrying out ring opening on the polylactic acid prepolymer, and polymerizing the polylactic acid prepolymer with dimethyl diallyl ammonium chloride to obtain a polylactic acid block copolymer; and step 4, injection molding: adding the polylactic acid block copolymer into an injection molding machine for injection molding. The problems existing in an existing polylactic acid injection molding method are solved, namely, the prepared polylactic acid is improved in the aspects of mechanical property and toughness, the processability and transparency of the polylactic acid can be guaranteed, and the polylactic acid can be applied to most industries.
Owner:无锡御束生物材料科技有限公司
A kind of preparation method of colorless transparent sodium polyacrylate dispersant
The invention discloses a preparation method of a colorless and transparent sodium polyacrylate dispersant. The low-molecular-weight polymerized acrylic acid is synthesized through light-assisted initiation of polymerization at the initial stage of polymerization. The polymerized acrylic acid is continuously irradiated with ultraviolet rays during the neutralization process with sodium hydroxide. light or visible light. Finally, a certain amount of benzoyl peroxide is added to the synthesized polymer to achieve the corresponding decolorization and antiseptic effects. The invention prepares a sodium polyacrylate dispersant, the sodium polyacrylate dispersant is in a colorless and transparent state, its chromaticity is excellent when tested by a spectrophotometer, and a good effect is achieved in the application field. The dispersant has simple preparation method, low cost, stable product performance and good dispersion performance.
Owner:SNF CHINA FLOCCULANT
Thermal expansion microsphere with particle size of 1-100 microns prepared by emulsion polymerization
PendingCN114149608AInitiation temperature is lowHigh utilization rate of blowing agentAcrylic acidOxidizing agent
In order to overcome the defects and deficiencies in the prior art, the invention aims to adopt a novel synthesis technology and formula to synthesize the thermal expansion foaming microspheres through emulsion polymerization. The efficient thermal expansion microspheres prepared by the novel preparation method comprise the following components in parts by mass: 20-30 parts of acrylic monomers, 50-80 parts of acrylonitrile, 1-2 parts of a cross-linking agent, 40-80 parts of a foaming agent, 0.2-0.6 part of an oxidant, 1-2 parts of an emulsifier, 0.5-2 parts of a co-emulsifier, 0.2-0.6 part of a reducing agent, 3-6 parts of a stabilizer and 100-250 parts of water. The method has the advantages that the foaming agent utilization rate is higher; the thermal expansion microspheres are higher in strength; the thermal expansion microspheres are more uniform and smaller in particle size distribution, smooth in surface and perfect in core-shell structure.
Owner:HUBEI UNIV
Highly adaptable multi-branched amidoimide type polycarboxylate water reducer and preparation method thereof
InactiveCN108912279BImprove rigidity and flexibilityHigh water reduction ratePolymer scienceFunctional monomer
The invention relates to a high-adaptability multi-branched-chain amide imine type polycarboxylate based water reducer and a preparation method thereof, and belongs to the technical field of concreteadditives. The polycarboxylate based water reducer is composed of the following substances: polyether macromonomers, unsaturated acid monomers, branched-chain functional monomer methoxy polyethylene glycol mercaptoacetate, amide imine type functional monomer diethylenetriamine maleate, an initiator, a reducing agent and deionized water, wherein the molar ratio of the polyether macromonomers to theunsaturated acid monomers to the branched-chain monomers to the amide imine type monomers is 1:(2-5):(0.3-0.6):(0.5-1.0). The prepared water reducer has a relatively high water reducing rate and excellent slump retaining performance, and the problem of adaptability between cement concrete and the polycarboxylate based water reducer is also solved. The invention further provides a preparation method thereof. The preparation method comprises four steps, is scientific and reasonable, and is simple and feasible.
Owner:SHANDONG VOCATIONAL COLLEGE OF LIGHT IND
Method for preparing plant potassium-containing super absorbent resin by corncob one-pot method
The invention discloses a method for preparing potassium-containing super absorbent resin from corncobs by a one-pot process. The method comprises the following steps: S1, soaking crushed corncob powder in a low-concentration alkali solution, then adding a high-concentration alkali solution for alkalization reaction, and then adding sodium chloroacetate for etherification reaction to obtain corncob carboxymethyl cellulose; S2, mixing acrylic acid and a neutralizer for a neutralization reaction, and obtaining acrylic acid and a salt solution thereof ; S3, mixing the corncob carboxymethyl cellulose prepared in the step S1 with an oxidizing agent, a cross-linking agent, acrylic acid and a salt solution thereof, introducing nitrogen and stirring, and then adding a reducing agent to carry out polymerization reaction; and S4, after the polymerization reaction is finished, carrying out heating and heat preservation to obtain the product. The water absorption performance and the water retention performance of the super absorbent resin prepared by the method are more than two times of those of similar products in the current market, the potassium content is high, the preparation cost is low, and the super absorbent resin has huge application prospects in the industries of soil moisture retention, desert control, agriculture and forestry, flower transportation and the like.
Owner:WEIFANG UNIV OF SCI & TECH
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