Epoxy adhesive fast curable at room temperature and preparation method thereof

Abstract

The invention discloses an epoxy adhesive fast curable at room temperature and a preparation method thereof. The adhesive is composed of a component A and a component B, wherein the component A and the component B are cooperatively used according to a volume ratio of 100: (40-60). The component A comprises 60 to 80 parts of epoxy resin, 20 to 40 parts of flexible epoxy resin, 40 to 60 parts of a flexibilizer, 4 to 6 parts of a coupling agent, 40 to 60 parts of a filler and 4 to 6 parts of hydrophobic fumed silica. The component B comprises 20-40 parts of a modified polyamide curing agent, 20-30 parts of a modified aliphatic amine curing agent, 15-25 parts of a modified alicyclic amine curing agent, 3-10 parts of a toughening accelerator, 5-10 parts of a toughening agent, 20-30 parts of a filler, 2-3 parts of hydrophobic fumed silica and 2-3 parts of a coupling agent. The adhesive has the advantages of appropriate operation time, fast strength improvement capability, high toughness, good mechanical strength, and excellent adhesion to metals and composite materials.

Description

technical field [0001] The invention relates to the field of epoxy adhesives, in particular to a room-temperature fast-curing epoxy adhesive for toughened high-strength composite materials and a preparation method thereof. Background technique [0002] With the rapid development of science and technology, the application of various new plastics and high-strength composite materials (SMC, GRP, CFRP) in aerospace, automobile industry, machinery manufacturing, medical field, rail vehicles, smart home and other fields is gradually increasing. , in the application process of these materials will involve a large number of bonding between metal and composite materials, composite materials and composite materials. However, composite materials need to add some release agents during the molding process, which makes it difficult to have a good bonding effect. After continuous research and development, acrylic adhesives and epoxy adhesives are currently used more in the field of compos...

AI Technical Summary

Problems solved by technology

However, acrylic adhesives have the following disadvantages: ①It has a strong odor during use, which has a certain impact on users and the environment; ②The operating time is short, the curing speed is fast, and the reaction exotherm is violent, so it cannot be used for bonding large areas and large gaps; ③It is not ideal in terms of high temperature resistance, corrosion resistance and weather resistance

However, the existing epoxy adhesives have the following disadvantages: ① The strength of epoxy adhesives with a long operating time is slow to increase. The operating time of such adhesives is mostly 1-2 hours, and generally takes 10-15 hours to be initially cured, which seriously restricts production efficiency and increases process cost

② Epoxy adhesives with short initial curing time, short operating time and poor toughness

The operation time of this kind of epoxy adhesive is 5-15 minutes, the initial curing time is 2-3 hours, the speed of strength improvement is still slow, and the adaptability to large-size and special-shaped substrates is poor, and most of these epoxy adhesives have poor toughness

③The adhesion of epoxy adhesive to some demolded composite materials needs to be improved

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