Polyhydroxy vinyl ester resin, preparation method thereof and thickening method

Abstract

The invention discloses polyhydroxy vinyl ester resin, a preparation method thereof and a thickening method, which relate to the technical field of a composite material. The polyhydroxy vinyl ester resin comprises the following components in parts by weight: 10 to 30 parts of an epoxy compound, 20 to 50 parts of epoxy resin, 20 to 30 parts of unsaturated monoacid, 25 to 40 parts of a crosslinkingmonomer, 0.01 to 0.09 parts of a catalyst, and 0.1 to 0.3 parts of a polymerization inhibitor, A structure of the epoxy compound is shown as the specification, wherein the R contains -CmH2m+1, or thestructure shown as the specification, wherein the m=2-14, and n=2-6. The polyhydroxy vinyl ester resin takes the epoxy compound and epoxy resin as a base body, and unsaturated monoacid, the catalyst,the polymerization inhibitor, the crosslinking monomer and the base body are reacted to prepare the hydroxy-vinyl ester resin, the method is simple and convenient, and the polyhydroxy vinyl ester resin can realize rapid thickening.

Description

technical field [0001] The invention relates to the technical field of resin composite materials, in particular to a polyhydroxy vinyl ester resin, a preparation method and a thickening method thereof. Background technique [0002] Compression molding method (SMC / BMC) process, because it is suitable for large-scale production of parts and products with high precision, complex structure and high appearance requirements, has become an important process of composite materials at home and abroad. This SMC / BMC The BMC process can be mechanized and automated, and the products produced have good stability and high reproducibility. [0003] Thickening properties are the basic conditions for vinyl ester resins in SMC / BMC process applications. At present, the application of vinyl ester resins in the SMC process has the disadvantage of slow thickening. Generally, the general-purpose unsaturated polyester resins can reach a stable value of viscosity within 24 to 40 hours, while vinyl e...

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Problems solved by technology

However, general-purpose vinyl ester resins do not contain hydroxyl groups with chemical thickening bases, which limits their application in SMC / BMC processes

[0004] Chinese patent ZL200610200365.8 discloses rapid thickening vinyl ester resin and its preparation method and application. ~6 hours, until the acid value is less than 20mgKOH / g, add maleic anhydride, continue the reaction for 2-3 hours, until the acid value drops to less than 35mgKOH / g, cool down to below 100°C, add cross-linking monomer, and mix well , to make an epoxy vinyl ester resin matrix", it can be seen that the synthesis reaction temperature of the epoxy vinyl ester resin disclosed in this patent is relatively high, which will make the reaction difficult to control and easily produce side reactions

[0005] U.S. Patent No. 4,347,343 uses the method of adding a thickening accelerator to increase the speed and effect of thickening. The thickening accelerator added in this patent is a long linear polymer with free carboxyl group synthesized by high molecular weight polyethylene glycol and trimellitic anhydride. The accelerator can play a certain role in accelerating, but if you want to achieve the best thickening effect in a short cycle, you must add a larger amount of MgO powder or add a larger amount of thickening accelerator, adding MgO powder It will bring a lot of inconvenience to the subsequent operation and construction of the made SMC material, and reduce the efficiency of production; adding a large amount of thickening accelerator will result in the addition of too much inert saturated polyester in the resin system. The curing performance of the resin gel is deteriorated, the hardness is reduced, and the excessively high addition amount will also affect the degree of curing, which will reduce the surface quality of the molded product.

At the same time, too many symmetrical polyethylene glycol structures are introduced into the resin, which will make the color of the obtained resin turbid and affect the appearance of the product.

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