Two-component polyurethane structural adhesive and preparation method thereof

Abstract

The invention discloses a two-component polyurethane structural adhesive and a preparation method thereof. The two-component polyurethane structural adhesive is prepared from a component A and a component B. The component A comprises castor oil polyol, phosphorus trichloride modified polyether polyol, aromatic polyester polyol, a first heat conduction filler, a first flame-retardant filler and a first assistant, and the component B comprises an isocyanate-terminated polyurethane prepolymer, polymethylene polyphenyl polyisocyanate, a second heat-conducting filler, a second flame-retardant filler and a second auxiliary agent; the two components are mixed according to a certain volume ratio to prepare the double-component polyurethane structural adhesive. The phosphorus trichloride modified polyether polyol is a special alkyl phosphite stabilizer and is also a phosphorus-containing polyol flame retardant, so that the use amount of flame-retardant filler can be reduced, the component density can be reduced, and the crosslinking density of the system can be improved; the bi-component polyurethane structural adhesive has the advantages of low density, and high flame retardancy, heat conductivity, high-temperature shear strength and low-temperature curing property.

Description

technical field [0001] The invention relates to the technical field of two-component polyurethane structural adhesives, in particular to a two-component polyurethane structural adhesive and a preparation method thereof. Background technique [0002] The polyurethane composite material has high strength and good wear resistance, and its performance has a wide adjustable range. These excellent properties of polyurethane composite materials gradually replace metals and ceramics and are applied to the fields of automobile, industry, construction and electronic appliances. 80% of new energy vehicle battery failures come from power batteries, and the main causes of battery failures are insulation damage, short circuit and fire, and these problems may even lead to explosions and accidents. In order to solve the safety problem of the power battery, it is necessary to comprehensively consider the aspects of shock resistance, flame retardancy, and heat conduction. The flame-retardant...

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Problems solved by technology

However, the process is complex, the synthesis conditions are harsh, and the prepared power battery protective material has poor impact resistance, and adding a large amount of flame-retardant fillers cannot achieve the effect of impa

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