Two-component epoxy adhesive as well as preparation method and application thereof

Abstract

The invention relates to a two-component epoxy adhesive as well as a preparation method and application thereof. The adhesive comprises a component A and a component B in a weight ratio of 1:(0.8-1.2), wherein the component A is prepared from the following raw materials in percentage by weight: 5-15 percent of epoxy resin, 10-25 percent of polyurethane modified epoxy resin, 5-20 percent of toughening agent, 3-10 percent of epoxy diluent, 20-50 percent of halogen-free flame-retardant filler, 20-50 percent of heat-conducting filler, 0.1-1 percent of defoaming agent and 1-3 percent of white carbon black, and the sum of the content percentages of the raw materials is 100 percent; and the component B is prepared from the following raw materials in percentage by weight: 5-15 percent of aliphaticamine, 2-10 percent of polyether amine, 8-16 percent of modified polyamide, 20-50 percent of halogen-free flame-retardant filler, 20-50 percent of heat-conducting filler, 0.1-1 percent of defoaming agent and 1-3 percent of white carbon black, and the sum of the content percentages of the raw materials is 100 percent. The adhesive has the characteristics of environmental protection, flame retardance, heat conduction, high curing speed, high bonding strength, good toughness and vibration resistance, and is very suitable for heat conduction bonding between a power battery cell and a bottom watercooling plate.

Description

technical field [0001] The invention relates to a two-component epoxy adhesive and its preparation method and application. Background technique [0002] The new energy vehicle industry is currently developing rapidly, and its battery life and safety have attracted people's attention. As the core component of new energy vehicles, power batteries are very important in terms of energy density, charging and discharging speed, and heat dissipation. Adhesives are becoming more and more important as auxiliary materials for power batteries, and their main functions are fixing, protection, weight reduction, shock absorption, noise reduction, heat transfer, etc. The fixing of the battery cell of the square battery and the bottom water-cooled plate requires the adhesive to have a good bonding and fixing effect, fatigue resistance, aging resistance, excellent dielectric properties, and a certain heat transfer capacity. [0003] Chinese patent applications 201911052237.3 and 2019107425...

AI Technical Summary

Problems solved by technology

[0003] Chinese patent applications 201911052237.3 and 201910742555.6 use two-component polyurethane and two-component epoxy adhesives respectively to realize the bonding of the battery cell in the power battery, but they do not have high thermal conductivity and cannot be used between the battery cell and the water-cooled plate ; Chinese patent application 201811227378.X uses MS-epoxy hybrid system to achieve thermal bonding, but it takes 7 days to reach the final strength, which affects the efficiency of the production line to a certain extent; Chinese patent application 201910624733.5 uses double The one-component epoxy adhesive realizes the heat conduction bonding, but its composition contains bromine, antimony and other non-environmental components; the Chinese patent application 201610974942.9 uses the two-component epoxy adhesive to realize the heat conduction bonding, but it does not reflect the bonding strength Indicators such as shear strength, toughness indicators such as elongation at break, if the epoxy adhesive has insufficient bonding strength or poor toughness, it cannot pass the anti-vibration test, nor can it guarantee long-term vibration use

[0004] To sum up, although some adhesive products have been applied in the power battery industry, there is a lack of a product with better overall performance