Method for preparing high performance urethane elastomer for thermal barrier coating

Abstract

The invention provides a preparation method of a thermal insulation coating high-performance polyurethane elastomer. After the reaction of terminal hydroxyl polybutadiene liquid rubber and polyisocyanate, polyurethane is added for reaction for 3 to 4.5 hours at 85 to 90 DEG C to produce isocyanate-terminated prepolymer; a certain amount of heat insulating filler is added in the prepolymer and is mixed evenly to produce component A; chain extender, antioxidant, curing agent and solvent are mixed evenly according to a certain portion to produce component B; the component A and the component B with the weight portion of 3: 1 to 6: 1 are mixed, stirred evenly, cured at room temperature to produce the thermal insulation coating high-performance polyurethane elastomer. The process of the invention used to synthesize the thermal insulation coating high-performance polyurethane elastomer is more reasonable, the product has higher quality and better comprehensive properties. The test date shows that the tensile strength is 3.50 to 5.80MPa, the elongation at break is more than 220 percent, the bond strength is more than 10.0MPa, the glass transition temperature is less than 60 DEG C below zero, the solidification shrinkage rate is less than 0.1 percent. The product is mainly applicable to aerospace industry.

Description

technical field The invention belongs to the technical field of polymer materials, and relates to the preparation of a high-performance polyurethane elastomer, in particular to the preparation of a high-performance polyurethane elastomer for heat-insulating coatings, which is mainly used in aerospace and other fields. Background technique When the flying object passes through the dense atmosphere at a very high speed, due to the compression and friction of the surrounding air, a large amount of heat energy will be generated, which will cause the deformation of the flying object shell and affect the performance of the flying object. Therefore, a durable The polyurethane material with good abrasion resistance, high temperature resistance and good bonding performance with the base material of the flying object is used as a coating to protect the flying object. As a film-forming material for thermal insulation coatings, it is required to have high and low temperature resistance,...

AI Technical Summary

Problems solved by technology

The disadvantages of polyester polyurethane are poor hydrolysis resistance, high viscosity, strong rigidity, and small solid filling; the disadvantage of polyether polyurethane is poor heat resistance. The products are mainly used in automobiles, construction, mines and shoes, etc.

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