Industry news: a variety of different unsaturated monocarboxylic acids and different epoxy resins can be separated to obtain a variety of vinyl ester resins, and other unsaturated monomers and vinyl ester resins can also be used The phase separation of the hydroxyl groups on the molecule allows the resin to be modified in various ways, so there are more types. However, the basic type is a vinyl ester resin based on bisphenol A epoxy. This basic type resin can be used as a pure resin or can be diluted and cross-linked with a reactive monomer such as styrene.
Styrene is the most commonly used crosslinking monomer in the synthesis process of epoxy acrylic vinyl ester resin, and it is also a very important diluent for the resin itself. There are many other monomers with this function, and the main types include: divinyl benzene, vinyltoluene, chlorophenythylene, a-methylstyrene (a -methylphenythylene), isobutythylene, dicyclopentadiene acrylic acid ester, diallyl phthalate DAP, triallyl cyanurate cyanurate), acrylic acid ester, methyl acrylic acid ester.
Styrene has strong response, good performance, and low price.When using styrene in vinyl ester resin, the heat distortion temperature under different styrene dosages can be measured.The amount of monomer added when the highest temperature value is obtained is styrene. The most suitable dosage. The styrene content has an influence on the chemical resistance of the vinyl ester resin. When the styrene content is low, the resin has good chemical resistance, and other cross-linking agents have different effects on the performance of the vinyl ester resin. The vinyl ester resin diluted with vinyl toluene is mostly used for electrical insulation.It has low water absorption, high bending strength, and high electrical breakdown strength preservation rate after thermal aging.It is easy to form in metal die-processing, and Low volatility and higher flash point than styrene. Diluting vinyl ester resin with dicyclopentadiene ester has a longer shelf life than diluting with styrene, and it has good compatibility with vinyl ester resin. In order to obtain the corresponding viscosity value, more dicyclopentadiene acid esters are needed. Such a defect is that the resulting resin is more brittle, and the mechanical properties of the vinyl ester resin in different crosslinking agents are also different. When using styrene or chlorostyrene, vinyl toluene to stop crosslinking and curing, the tensile strength and elongation are higher, while using dicyclopentadiene acrylate and divinylbenzene to stop curing, the tensile strength and elongation are low, Brittleness is greater.
The types and types of modifiers are also huge. The main purpose of the modifier application is to give new properties to the vinyl ester resin or to improve the construction process, usually using isocyanates, rubbers, polyurethanes, etc.The participation of these substances can effectively improve the epoxy acrylate vinyl ester resin The overall performance of the resin, but does not affect the main structure of the resin, in other words, the process of synthesizing epoxy acrylic vinyl ester resin is not related to the modifier. The main purpose of adding the modifier is to improve product application performance or to improve construction process performance. . According to experts, under normal circumstances, it is difficult for a polymer additive to have both toughening and shrinkage reduction effects. However, in the experiment, it was found that the modification of vinyl ester resin by nitrile rubber can have both toughening and shrinking duality, that is, it can play the role of toughening vinyl ester resin at low addition amount, and at high addition amount It can significantly reduce the shrinkage rate of resin curing. After engineering application, the following substances have been found to modify epoxy acrylic vinyl resin. The main types include: toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), polymethylene polyphenyl polyisocyanate (PAPI), hexamethylene diisocyanate (HDI), isophorone diisocyanate (IPDI), trimethyl hexamethylene diisocyanate (TMDI), dicyclohexylmethane diisocyanate (HMDI), xylylene diisocyanate (XDI ), tetramethyl xylylene diisocyanate (TMXDI), methyl styrene isocyanate (TMI), hexahydrotoluene diisocyanate (HTDI), nitrile rubber, polyurethane.