31results about How to "No gel" patented technology

The invention relates to a synthesis process of air-drying epoxy vinyl ester resin, which consists of bisphenol A type epoxy resin with low epoxy equivalent and high epoxy equivalent, and organic monobasic unsaturated carboxylic acid with a catalyst at 120-160 ° C. React in the presence of a polymerization inhibitor, and then be diluted with a cross-linkable monomer to synthesize. The resin has good air-drying property, surface dry ≤ 0.5 hours, solid dry ≤ 4 hours, moderate viscosity, good wettability with glass fiber and glass felt, excellent physical and mechanical properties, excellent chemical corrosion resistance, suitable for such as hand lay-up, winding, stretching Extrusion, injection and other FRP molding processes. In the synthesis process of the invention, the production process is simplified, the production energy consumption is reduced, and the product has good stability.

A low temperature resistant protective film agent for fruit trees and a preparation method thereof. The agent is mainly prepared from components of vinyl acetate, a soft monomer of butyl acrylate monomer, a hard monomer of methyl methacrylate, a functional monomer of acrylic acid and an emulsion synergistic agent into a copolymer emulsion. The copolymer emulsion is then supplemented with functional materials including an inorganic dispersant, an organic dispersant, a wetting agent, a film forming agent, a surface active agent, an antifreeze, a heat resistance material, a fungicide and colloidal. The invention has the advantages of simple preparation process, low cost, stable polymerization of copolymer emulsion, no gel, minimum film forming temperature of 0 DEG C, good film forming effect, solid content of 44.5% and water absorption of 19.66%, can significantly improve the resistance of fruit trees to low temperature cold damage, prevent sunburn and pumping damage, delay the germination period, and is safe and environment-friendly.

The invention discloses a graphene slurry for a cationic waterborne polyurethane coating, and a preparation method and application thereof. The graphene slurry for the cationic waterborne polyurethane coating is an aqueous dispersion of modified graphene prepared by modifying graphene oxide with carbodiimide to obtain the modified graphene and then dispersing the modified graphene in water, wherein in the aqueous dispersion of the modified graphene, a ratio of the modified graphene to water is 2-20 mg: 1 ml in terms of the dry weight of the modified graphene. The graphene slurry can be cooperated with cationic waterborne polyurethane resin, so the advantage of long-term stable dispersion is obtained, and the graphene slurry is friendly to environment, long in storage time and free of precipitation, flocculation and gelation after storage at room temperature for one year or more. A coating prepared from the graphene slurry has elastic modulus of 2.2-2.31 GPa and neutral salt spray time of 72 to 120 h.

The invention belongs to the technical field of industrial defoaming agents, and in particular relates to a defoaming agent for carboxylated nitrile butadiene latex and a preparation method thereof. The antifoaming agent for carboxylated nitrile latex is prepared from the following raw materials in parts by weight: 10-20 parts of polysiloxane; 2-10 parts of white carbon black; 1-5 parts of emulsifier; 100 parts of deionized water The preparation method is as follows: adding polysiloxane and white carbon black to the reaction kettle in turn, heating up to 110-140 ℃, reacting for 3-6 hours, cooling to 60-90 ℃, adding emulsifier and deionized water, The reaction was carried out for 20-50 minutes, and then lowered to room temperature to obtain the product. The defoaming agent of the present invention is a polysiloxane emulsion type defoaming agent, which is mainly used for eliminating foam in the production process of carboxylated nitrile butadiene latex, and is especially suitable for foaming in the process of removing monomer after polymerization. It has the advantages of fast defoaming and excellent anti-foaming, and does not cause the advantages of latex gel; its preparation method is scientific, reasonable and simple.

The invention provides an epoxy oligomer chain extender and a preparation method thereof. The epoxy oligomer chain extender can significantly improve the intrinsic viscosity and molecular weight of polyester and nylon type polymer materials and reduce the content of terminal carboxyl groups. The chain extender is prepared from the following components in parts by weight: 50-80 parts of a styrene monomer, 15-25 parts of an acrylic acid glyceride monomer, 5-25 parts of an acrylic acid monomer, 0.1-0.5 part of an initiating agent and 0.1-1.0 part of a chain transfer agent. The preparation method of the chain extender comprises the steps of selecting the reactive monomers and auxiliary agents, adding the monomers and auxiliary agents into a reaction kettle in sequence, and performing polymerization reaction at a certain stirring speed at 120-150 DEG C; drying the reactant to obtain a finished product which is a multi-monomer copolymerized oligomer with low molecular weight. Compared with the existing conventional micro-molecular chain extender, the epoxy oligomer chain extender provided by the invention has the characteristics of simple preparation, wide application range, safety, reliability, high chain extension efficiency, good water resistance, no generation of gel and the like.

The invention provides a modified graphene and its preparation method and application, comprising: adding a dispersant and graphene to the first deionized water to obtain a graphene dispersion; adding an acid to the second deionized water to obtain an acid solution and adding the acid solution to the graphene dispersion, stirring, adding a coupling agent, and drying to obtain modified graphene, wherein the modified graphene is coated with a coupling agent and adsorbed with acid. The modified graphene prepared by the method of the present invention improves the compatibility of organic acid and inorganic acid in the epoxy resin system, and solves the compatibility between the acidic substance and the epoxy resin system in the epoxy anti-corrosion paint with rust question.

The invention relates to the field of polymer synthesis, and in particular discloses a ternary iron-based catalyst and application thereof to catalyzing epoxy chloropropane and butadiene to prepare a novel polymer through copolymerization. The application to preparing the novel polymer is characterized by comprising the following steps: enabling the ternary iron-based catalyst to react in a hydrocarbon solvent, wherein epoxy chloropropane and butadiene are adopted as reaction substrates; performing a reaction for 1-24 hours at 0-100 DEG C, terminating the reaction after polymerization is completed, washing for multiple times with ethanol, adding an anti-aging agent, and drying to obtain a target product. As the ternary iron-based catalyst (an iron compound, an organic aluminum compound and an electron donor) is adopted to catalyze copolymerization of epoxy chloropropane and butadiene, the molecular weight of an obtained polymer is 10,000 or above, the polymer is light in color, the PDI is about 1.0-2.0, and the reaction is stable and easy to control.

The invention provides polyvinyl alcohol, which is characterized by having the average degree of polymerization in a range of 50-500, the alcoholysis degree in a range of 30-65 mol%, and the viscosity no more than 1500 mPa*s. Polyvinyl alcohol is prepared into an aqueous solution, which is taken as an auxiliary dispersant for suspension polymerization of vinyl polymers. The cloud point of an aqueous solution, the concentration of which is 5 wt%, (that is, a polyvinyl alcohol aqueous solution of 5 wt%), is no less than 1 DEG C and less than 15 DEG C. The viscosity measured at 25 DEG C of an aqueous solution, the concentration of which is 40 wt%, is no more than 1500 mpa*s. Gel and layering don't appear in an aqueous solution, the concentration of which is in a range of 30wt%-50wt%, in at least one year, so that the aqueous solution is extremely excellent in stability.

The invention discloses graphene slurry for anionic aqueous polyurethane coatings, a preparation method of the graphene slurry and an application. The graphene slurry for the aqueous polyurethane coatings is modified graphene aqueous dispersion, oxidized graphene is modified by carbodiimide to obtain modified graphene, and the modified graphene is dispersed into water to obtain the modified graphene aqueous dispersion. In the modified graphene aqueous dispersion, according to the dry weight of the modified graphene, the ratio of the modified graphene to water is 2-20mg: 1ml. The graphene slurry can be matched with anionic aqueous polyurethane resin to achieve the advantage of long-term dispersion stability, is environmentally friendly and long in preservation time, and is capable of being preserved for at least one year at room temperature without deposition, flocculation or gelling. After use, the elastic modulus of the finally obtained coatings can reach 2.23-2.34GPa, and neutral salt spray time can reach 60-120 hours.

The invention discloses fluorine containing polymer concentrated dispersion liquid and a method for preparing a fluorine containing polymer from the fluorine containing polymer concentrated dispersion liquid. A surfactant with the molecular structural formula being CF3{(CF2)nC(CF3)2CH2}mCOOH is used as a polymerization dispersant to prepare the fluorine containing polymer, wherein n is an integer ranging from 0 to 4, and m is an integer ranging from 1 to 2. The fluorine containing polymer concentrated dispersion liquid can be used for the process of producing the fluorine polymer through a water-phase dispersion polymerization process, and the uncontrollable molecular weight caused by a surfactant chain transfer reaction is avoided when the fluorine containing polymer concentrated dispersion liquid is especially used for TFE, TFE / HFP, TFE / PPVE and TFE / ethylene polymerization reactions; the surfactant can be used as a substitute for PFOA or one of substitute components and used for water-phase dispersion polymerization of the fluorine containing polymer, and no gel is formed by polymerized emulsion.

The invention discloses a polylactic acid material with high melt strength and a preparation method thereof. The composition of raw materials of the present invention is (by mass percentage): 95.7-99.7% of polylactic acid (PLA), 0.1-5% of 1,6-hexanediol diacrylate (HDDA), 0.01% of dicumyl peroxide (DCP) ~0.4% and 0~2% of processing aids; with dicumyl peroxide as initiator, realize polylactic acid and 1,6-hexanediol diacrylate melting grafting reaction by twin-screw extruder, the obtained The product: 1, 6‑hexanediol diacrylate grafted polylactic acid (HDDA‑g‑PLA) material with high melt strength and improved crystallization ability of PLA. The process of the invention is very simple, the obtained grafted polylactic acid material has significantly improved melt strength, and the process is easy to realize large-scale production, the product has no gel and crosslinking phenomenon, high production efficiency, stable quality, and can be used for secondary processing.