A method for reducing the void ratio of FRP

Abstract

The invention relates to the field of glass steel processing and manufacturing, and in particular relates to a method for reducing the voidage of glass steel. According to the method, by pasting an inner layer and an outer layer on the basis of a conventional formula and pasting an intermediate layer on the basis of an adjusted formula, when the inner and outer layers of a glass steel product are normally cured, shrinkage pressure is applied to the intermediate layer which is cured later, the uncured resin of the intermediate layer moves to fill void parts in the inner and outer layers of the product under the internal and external pressures, so that most of voids in the product are blocked, and closed holes in the product are compressed. The uncured resin flows out of a gap of an opening, so that a leakage point of the product can be found; meanwhile, the uncured resin flows out of the leakage point, so that internal stress caused by curing shrinkage is reduced, the density and strength of the product are improved, the voidage and the water absorption are reduced, the corrosion resistance of the product is improved, and the field of application is expanded.

Description

technical field [0001] The invention relates to the field of FRP processing and manufacturing, in particular to a method for reducing the void ratio of FRP. Background technique [0002] At present, with the continuous expansion of the application range of FRP, the application of composite materials is getting more and more attention. Hand lay-up is an indispensable molding method in FRP products. FRP hand lay-up accounts for a large proportion of the entire FRP output, but there are still many shortcomings in hand lay-up molding. For example, the void ratio in hand-laid FRP products is very high. The quality problem brought by the high rate of the product is very big. How to solve this problem, and solve this problem can improve the performance of the FRP product, increase its use range and enhance the service life. [0003] The voids in FRP are divided into two types: open pores and closed pores. The voids in FRP are composed of three parts: ①The voids in the resin, which...

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Problems solved by technology

On the one hand, the presence of voids in the FRP will cause internal stress concentration and reduce the actual load-bearing area. On the other hand, after the gaps are formed between the glass fiber and resin interface, the resin cannot transmit the received stress to the fibers, causing these fibers to lose In terms of actual load capacity, in terms of electrical properties, FRP has a high void content, so its hygroscopicity must be large, and the small molecules are polar, which not only reduces the electrical insulation performance of FRP, but also can hydrolyze the glass fiber and reduce its strength.

[0006] In order to reduce the void content in FRP, improve the quality of FRP itself, and thus improve the performance of FRP products, people have also tried some methods, but the effect is not very obvious

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