Relationship Between Epoxy Resin And Epoxy Ester
Epoxy resin with excellent adhesion, excellent mechanical properties, good chemical corrosion resistance and excellent thermal stability, is widely used in mechanical manufacturing and daily life production;However, the traditional epoxy resin is difficult to dissolve in water and can only be dissolved in organic solvents such as aromatic hydrocarbons, ketones and alcohols. Therefore, organic solvents must be used as dispersing medium to prepare epoxy resin coating with a certain concentration and viscosity.Diluting epoxy resin with organic solvents is not only costly, but also flammable and explosive, bringing great potential safety hazards. At the same time, the toxic and harmful volatile components of organic solvents bring great harm to the health of operators, and also cause serious pollution to the environment.With the increasing requirement of environment, the state has issued a series of laws and regulations to strictly control the emission of volatile organic compounds.Therefore, environmental friendly green chemical materials is more and more attention, the epoxy resin with open loop of lauric acid esterification, again through the method of free radical graft polymerization, under the catalysis of ammonium persulfate (APS) will hydrophilic monomer methylacrylic acid (MAA), functional monomer methyl methacrylate (MMA), butyl acrylate (BA), styrene (St) and crosslinking monomer N - methylol acrylamide (NMA) grafted to epoxy resin on the molecular chain of ammonia neutralization after small particle size, good stability and performance of waterborne epoxy resin, and analyzes the esterification rate,The influence of the ratio of hard and soft monomers and solvent on the system performance.
A) epoxy resin ring was opened to make epoxy ester, and then hydrophilic monomers, hard and soft monomers and crosslinking monomers were grafted to epoxy ester molecular chain by free radical graft polymerization to prepare water-borne epoxy resin emulsion.
B) when the esterification rate is 50%, the mass ratio of soft and hard monomers is 1:0 and the solvent is removed, the water-based epoxy resin emulsion prepared has small particle size, good dispersion and stability, and the best water-resistance and adhesion after curing into a film.
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