30results about How to "Initiation temperature is low" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.