Thermoplastic polyurethane elastomer with hydrolytic stability and preparation method thereof

Abstract

The invention discloses a thermoplastic polyurethane elastomer which is hydrolysis resistant and the preparation thereof and particularly discloses a thermoplastic polyurethane elastomer which uses organic vulcabond comprising carbodiimide modification as a hydrolysis resisting accessory ingredient. The thermoplastic polyurethane elastomer not only is provided with good hydrolysis resistant performance, but also has good compatibility and low cost without the need to add auxiliary production equipment, therefore the production cost is reduced to a large extent.

Description

technical field [0001] The invention relates to a hydrolytically stable thermoplastic polyurethane elastomer containing a hydrolysis-resistant auxiliary agent and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer (TPU) has both the advantages of rubber and plastic, and has excellent comprehensive properties. Poor, the scope of application is limited. [0003] The reason for the poor hydrolytic stability of thermoplastic polyurethane elastomers is that after water penetrates into the elastomer, it reacts chemically with the groups in TPU, resulting in chemical degradation, the chemical composition and physical structure of the elastomer are destroyed, and the hydrolysis is irreversible. Schol lenberger et al pointed out that the groups most sensitive to hydrolysis in TPU are ester groups, carbamate and urea groups, and the mechanism is as follows: [0004] [0005] In terms of improving the hydrolytic stability of TPU, at pr...

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Problems solved by technology

Although it improves the hydrolysis resistance of the material, the production cost of polyurethane elastomers is greatly increased due to the complicated preparation process and high price of such additives.

[0012] US3716502 discloses a method of adding a small amount of acid silica to improve the hydrolytic stability of polyurethane, but when this method is used for thermoplastic polyurethane elastomers, especially microporous polyurethane elastomers, acid silica is difficult to disperse evenly

[0013] US6559266 discloses a preparation method of thermoplastic polyurethane elastomer, which first mixes polyols for reproduction or mixes TPU prepared by different polyols, which complicates the production process and greatly increases the production cost

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