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Preparation method of self-repairing polyurethane elastomer based on carboxylate radical-ferric ion

A polyurethane elastomer, self-healing technology, applied in the field of preparation of self-healing flexible materials, can solve the problems of low self-healing efficiency, long repair time, low tensile strength and tensile strain, etc. Easy-to-control effects

Active Publication Date: 2020-07-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of self-repairing polyurethane elastomer based on carboxylate radical-ferric ion
  • Preparation method of self-repairing polyurethane elastomer based on carboxylate radical-ferric ion
  • Preparation method of self-repairing polyurethane elastomer based on carboxylate radical-ferric ion

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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 radical-ferric ions, and relates to a preparation method of a self-repairing flexible material. The invention aims to solve the problems of low tensile strength and tensile strain, long repair time and low self-repair efficiency of the existing self-repair flexible material. The preparationmethod comprises the following steps: 1, preparing hydroxyl-terminated carboxyl polybutadiene; 2, preparing a hydroxyl-terminated carboxypolybutadiene ferric chloride solution; 3, preparing a prepolymer; and 4, performing polymerizing to obtain the self-repairing polyurethane elastomer. The preparation method of the self-repairing polyurethane elastomer has the advantages that by introducing carboxylate radicals and ferric ions, the self-repairing performance of the elastomer is greatly improved compared with that of an elastomer to which the introducing carboxylate radicals and ferric ions are not introduced, and the tensile strength of the elastomer is also correspondingly improved. The prepared self-repairing polyurethane elastomer is applied to constructional engineering, military equipment or biomimetic 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 Applications(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