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A kind of preparation method based on carboxylate-ferric ion self-healing polyurethane elastomer

A polyurethane elastomer and self-healing technology, which is applied in the field of self-healing flexible materials, can solve the problems of low self-healing efficiency, long repair time, low tensile strength and tensile strain, etc., and achieve performance improvement, simple operation, easy to control effects

Active Publication Date: 2021-09-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of low tensile strength and tensile strain, long repair time and low self-repair efficiency in existing self-repair flexible materials, and provide a self-repair polyurethane elastic material based on carboxylate-ferric ion body preparation method

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  • A kind of preparation method based on carboxylate-ferric ion self-healing polyurethane elastomer
  • A kind of preparation method based on carboxylate-ferric ion self-healing polyurethane elastomer
  • A kind of preparation method based on carboxylate-ferric ion self-healing polyurethane elastomer

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specific Embodiment approach 1

[0026] Embodiment 1: This embodiment is a preparation method based on carboxylate-ferric ion self-healing polyurethane elastomer, which is specifically completed in the following steps:

[0027] 1. Preparation of hydroxy-terminated polybutadiene:

[0028] ①. Mix tetrahydrofuran and acetonitrile to obtain a solvent mixture; the volume ratio of tetrahydrofuran and acetonitrile is 1:4; ②. Add sodium bromate and sodium bisulfate to the solvent mixture until the solid is completely dissolved. Dissolve completely, add deionized water to solid and dissolve completely, obtain sodium bromate-sodium bisulfate mixed solution; The quality of described sodium bromate and the volume ratio of solvent mixed solution are 4.7g:50mL; The quality of described sodium bisulfate The volume ratio of the solvent mixture to the solvent mixture is 1.44g:50mL; ③. Add high cis-hydroxyl-terminated polybutadiene I into the sodium bromate-sodium bisulfate mixture, and reflux at a temperature of 60-70°C for 3...

specific Embodiment approach 2

[0032]Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the high cis-hydroxyl-terminated polybutadiene I described in step 1 ③ is prepared by oxidative cracking method to produce 1,4-cis-hydroxyl-terminated polybutadiene The diene content is 98% hydroxyl terminated polybutadiene. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0033] Specific embodiment three: The difference between this embodiment and specific embodiment one or two is that the high cis-terminated hydroxyl polybutadiene II described in step three is prepared by oxidative cracking method to produce 1,4-cis-terminated polybutadiene II The hydroxyl polybutadiene content is 98% hydroxyl terminated polybutadiene. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a preparation method of a self-repairing polyurethane elastomer based on carboxylate-ferric ion, which relates to a preparation method of a self-repairing flexible material. The purpose of the invention is to solve the problems of low tensile strength and tensile strain, long repair time and low self-repair efficiency in the existing self-repair flexible materials. Preparation method: 1. preparing hydroxy-terminated polybutadiene; 2. preparing ferric chloride solution of hydroxy-terminated polybutadiene; 3. preparing prepolymer; 4. polymerizing to obtain self-repairing polyurethane elastomer. The invention has the advantages that by introducing carboxylate and ferric ions, its self-healing performance is greatly improved compared with that of the unintroduced elastomer, and the tensile strength is also correspondingly improved. The self-healing polyurethane elastomer prepared by the invention is applied to construction engineering, military equipment or bionic materials and the like.

Description

technical field [0001] The invention relates to a preparation method of a self-repairing flexible material. Background technique [0002] Polyurethane elastomer prepared from hydroxyl-terminated polybutadiene is a kind of elastomer with good comprehensive properties, and the properties of hydroxyl-terminated polybutadiene are closely related to its molecular chain microstructure. 1,3-butadiene monomer has three different polymerization methods, among which the higher the cis-1,4 content, the lower the glass transition temperature, and the mechanical properties of its processed products, especially the low-temperature mechanical properties, are better, so the preparation High cis-terminated hydroxyl polybutadiene is more suitable for the preparation of polyurethane elastomers. On the other hand, as a flexible material, polyurethane elastomer is susceptible to damage or fracture caused by deformation, and it is not easy to detect, which greatly limits the reliability and life...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/69C08G18/65C08G18/10C08G18/32C08F8/42C08F8/00C08F136/06C08C19/26C08C19/36
CPCC08C19/26C08C19/36C08F8/00C08F8/42C08G18/10C08G18/692C08G18/7614C08G18/3206C08F136/06
Inventor 李春香李锦锦
Owner HARBIN INST OF TECH