Fast thickening vinyl ester resin as well as preparation method and application thereof

Abstract

The invention relates to a fast thickening vinyl ester resin as well as a preparation method and application thereof. The fast thickening vinyl ester resin comprises the following ingredients according to the parts by weight: 1000 parts of bisphenol A epoxy resin, 100-180 parts of unsaturation monocarboxylicacid, 20-35 parts of maleic anhydride, 1-3 parts of catalyst, 0.05-0.2 part of polymerization inhibitor and 800-2500 parts of crosslinking monomer; a thickening accelerator is generated by the reaction of the high-molecular-weight mixture of polyethylene glycol and/or polypropylene glycol and trimellitic anhydride, wherein the molar ratio of the polyethylene glycol/polypropylene glycol and the trimellitic anhydride is 1:1.3-1.5; and the weight ratio of the thickening accelerator and an epoxy vinyl ester resin matrix is 0.03-0.2:1. The preparation method comprises synthesizing the resin matrix and the thickening accelerator and mixing the resin matrix and the thickening accelerator. The invention has the advantages that a plurality of free carboxyls and the thickening accelerator with a plurality of long-chain branches are added, so that the thickening reaction can be more effectively carried out on the free carboxyls and MgO in the raw material of sheet molding compound, therefore, the thickening speed of resin system can be increased.

Description

technical field [0001] The invention relates to the technical field of organic high molecular polymer synthesis, in particular to a rapid thickening vinyl ester resin, a preparation method thereof, and an application thereof in preparing a vinyl ester resin sheet molding compound (SMC). Background technique [0002] Epoxy vinyl ester resins contain vinyl ester groups at both ends of the molecule, and the middle skeleton is epoxy resin, which are obtained by ring-opening esterification of unsaturated organic monocarboxylic acid and epoxy resin. Epoxy vinyl ester resin has both the excellent corrosion resistance and mechanical properties of epoxy resin, and has the convenient processing performance of unsaturated polyester resin. At present, it has become the main matrix material of corrosion-resistant FRP products and has a wide range of applications. , Throughout the anti-corrosion fields of various industries such as chemical industry, metallurgy, and construction. [0003...

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Problems solved by technology

[0004] In U.S. Patent No. 4,347,343, the speed and effect of thickening are also improved by adding a thickening accelerator. The thickening accelerator added in this patent is to use high molecular weight polyethylene glycol and trimellitic anhydride. Alcohol: Trimellitic anhydride = 1:2 molar ratio synthesis of long linear polymers with free carboxyl groups, this accelerator can also play a certain role in accelerating, but if you want to achieve the best thickening in a short cycle Effect, must add a large amount of MgO powder or add a large amount of thickening accelerator, adding MgO powder will bring a lot of inconvenience to the subsequent operation and construction of the SMC material made, reduce the efficiency of production; and add a large amount of The thickening accelerator will cause poor curing performance and lower hardness of the resin gel due to the addition of too much inert saturated polyester in the resin system. Excessive addition will also affect the degree of curing, making the surface of the product obtained by molding The quality is reduced, and it may even lead to problems such as sticking to the mold that are difficult to demould

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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