High-brightness impact-resistant aluminum epoxy repair adhesive and preparation method thereof

Abstract

The invention relates to high-brightness impact-resistant aluminum epoxy repair adhesive and a preparation method thereof. The epoxy repair adhesive is composed of component A and component B based in the weight ratio of 100:12.5-16.6 (i.e. 8:1-6:1), wherein the component A is composed of the following raw materials in weight ratio: 16-30 parts of bisphenol A epoxy resin, 15-25 parts of superfine full-vulcanized carboxylic nitrile butadiene rubber particle modified bisphenol A epoxy resin, 2.5-5 parts of an epoxy resin reactive diluent, 0.6-1.2 parts of a coupling agent, 28-32 parts of spherical metallic aluminum powder, 7-12 parts of spherical-like alumina powder, 5-10 parts of aluminum powder and 3-5 parts of white carbon black; and the component B is composed of the following raw materials in weight ratio: 6-10 parts of aminoethyl piperazine, 10-15 parts of isophorone diamine, 30-40 parts of modified aromatic amine, 25-35 parts of polyether amine, 9-15 parts of spherical-like alumina powder and 3-6 parts of white carbon black. The preparation method comprises the steps of preparation of the component A and the component B; and the component A and the component B are mixed according to the ratio when in use.

Description

technical field [0001] The invention relates to an epoxy repair adhesive, in particular to a high-brightness impact-resistant aluminum epoxy repair adhesive and a preparation method thereof, belonging to the technical field of adhesives. Background technique [0002] More and more modern vehicle parts and engine parts are manufactured by aluminum alloy die-casting process. Aluminum alloy die-casting parts have the characteristics of high precision, complex molding and good brightness. It is difficult to avoid air holes, trachoma, scratches, dimensional tolerances and wear in the manufacture and use of die-casting aluminum. Epoxy resin type aluminum metal repair glue has excellent bonding and repairing properties, and has the advantages of high mechanical strength, corrosion resistance, and firm adhesion to metal substrates. It is suitable for repairing and repairing aluminum alloy castings. [0003] Generally, aluminum epoxy repair glue is composed of epoxy resin curing sys...

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Problems solved by technology

[0004] The general aluminum epoxy repair adhesive cured product is brittle, with low impact resistance and poor aging resistance; the aluminum repair adhesive with better impact resistance is mostly modified by acrylic acid, polyurethane and carboxyl-terminated liquid nitrile rubber. Epoxy resin, but these modification methods improve the impact resistance of aluminum epoxy repair glue, but at the same time, the glass transition temperature of the cured product is greatly reduced; at the same time, because the modified product is mostly elastomer rubber, it has a large The viscoelasticity and viscous force of the resin greatly increase the viscosity of the resin, and it is difficult to fill a large amount of metal aluminum powder, which increases the difference in properties between the cured repair adhesive and the aluminum substrate, and reduces the processing performance; and the glue liquid flows when the temperature is high 1. When the temperature is low, it becomes hard, which makes the construction performance of the aluminum repair adhesive worse, and it is not easy to mix evenly.

[0005] Vehicle parts are mostly in high and low temperature alternating working conditions. Generally, repair adhesives have poor thermal stability and low aging resistance, and it is difficult to meet the harsh environment of long-term cold and hot alternating shocks.

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