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High-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application of high-strength room-temperature self-repairing polyurethane elastomer

A polyurethane elastomer, high-strength technology, applied in the field of high-strength room temperature self-healing polyurethane elastomer and its preparation, can solve the problems of less than 3MPa tensile strength of elastomer and harsh repair conditions, so as to improve self-healing performance and enhance mechanical properties. performance, the effect of accelerating energy dissipation

Active Publication Date: 2020-02-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese invention patent application CN108659188A discloses a polyurea self-healing thermoplastic elastomer and its preparation method, which can have a repair efficiency of 95.45% at room temperature in 2 hours by using disulfide exchange reaction, but the elastomer obtained by this technology stretches as it is Strength less than 3MPa
Chinese invention patent application CN106750145A discloses a polyether-type self-healing polyurethane, which coordinates with terbium chloride through an aminopyridine unit. Repair efficiency

Method used

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  • High-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application of high-strength room-temperature self-repairing polyurethane elastomer
  • High-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application of high-strength room-temperature self-repairing polyurethane elastomer
  • High-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application of high-strength room-temperature self-repairing polyurethane elastomer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] 1) Mix 100 parts of isophorone diisocyanate (IPDI) with 50 parts of polytetrahydrofuran diol (PTMEG1000) (dihydric alcohol is dehydrated before use: heat up to 105°C, and keep the vacuum degree above 0.06Mpa for dehydration 1- 2h) Mix and stir evenly, add 3 parts of dibutyltin dilaurate, and react at 80°C for 4 hours to obtain a prepolymer;

[0047] 2) Add 100 parts of N,N-dimethylacetamide diluent and 50 parts of 2,2'-dithiodibenzoic acid to the prepolymer, react at 80°C for 5 hours, then add 50 parts of 2,6 -diaminopyridine, continue to react for 1 hour to obtain a polyurethane masterbatch containing disulfide and ligand at the same time, then precipitate in methanol and dry to obtain product polyurethane;

[0048] 3) Dissolve the above product in 1000 parts of chloroform, add 20 parts of ferric chloride, stir at 60°C for 12 hours (condensation and reflux), pour into a mold for molding, and slowly evaporate the solvent at room temperature to obtain a high-strength roo...

Embodiment 2

[0050] 1) Mix and stir 100 parts of isophorone diisocyanate (IPDI) and 50 parts of polytetrahydrofuran diol (PTMEG 1000) evenly, add 3 parts of dibutyltin dilaurate, and react at 80°C for 4 hours to obtain a prepolymer;

[0051] 2) Add 100 parts of N,N-dimethylacetamide dilution and 50 parts of 2,2'-dithiodibenzoic acid to the prepolymer, add 50 parts of 2,6-diamino after reacting at 80°C for 5 hours Pyridine, and then continue to react for 1 hour to obtain a polyurethane masterbatch containing both disulfide and ligand, and then precipitate in methanol and dry to obtain the product polyurethane;

[0052] 3) Dissolve the above product in 1000 parts of chloroform, add 20 parts of zinc chloride, stir at 60°C for 12 hours, pour into a mold at room temperature and slowly evaporate the solvent to obtain a high-strength room temperature self-healing polyurethane material PU-2.

Embodiment 3

[0054] 1) Mix and stir 100 parts of isophorone diisocyanate (IPDI) and 50 parts of polytetrahydrofuran diol (PTMEG1000) evenly, add 3 parts of dibutyltin dilaurate, and react at 80°C for 4 hours to obtain a prepolymer;

[0055] 2) Add 100 parts of N,N-dimethylacetamide dilution and 50 parts of 2,2'-dithiodibenzoic acid to the prepolymer, add 50 parts of 2,6-diamino after reacting at 80°C for 5 hours Pyridine, and then continue to react for 1 hour to obtain a polyurethane masterbatch containing both disulfide and ligand, and then precipitate in methanol and dry to obtain the product polyurethane;

[0056] 3) Dissolve the above product in 1000 parts of chloroform, add 20 parts of aluminum chloride, stir at 60°C for 12 hours, pour into a mold at room temperature and slowly evaporate the solvent to obtain a high-strength room temperature self-healing polyurethane material PU-3.

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Abstract

The invention belongs to the technical field of self-repairing elastomer materials, and discloses a high-strength room-temperature self-repairing polyurethane elastomer based on multiple dynamic reversible effects as well as preparation and application thereof. A preparation method comprises the following steps: 1) reacting a dihydric alcohol with a diisocyanate under the action of a catalyst to obtain a prepolymer; wherein the dihydric alcohol is a mixture of more than one from a polyether glycol and a polysiloxane glycol; 2) reacting a dicarboxylic acid chain extender with the prepolymer toobtain an oligomer; adding a diamine chain extender, continuously reacting, and carrying out subsequent treatment to obtain polyurethane; wherein the dicarboxylic acid chain extender and the diamine chain extender are collectively called as chain extenders, and the chain extenders contain disulfide bonds and pyridine groups; 3) in an organic solvent, reacting polyurethane with a metal salt cross-linking agent, and removing the solvent to obtain the high-strength room-temperature self-repairing polyurethane elastomer. The preparation method is simple and mild in condition, and the prepared polyurethane elastomer is excellent in mechanical property and high in self-repairing efficiency and is applied to a flexible substrate materials, wearable equipment and intelligent protective coating.

Description

technical field [0001] The invention belongs to the technical field of self-healing elastomer materials, and in particular relates to a high-strength room-temperature self-healing polyurethane elastomer based on multiple dynamic reversible effects and its preparation method and application. Background technique [0002] As a kind of smart material, self-healing polymer materials can spontaneously repair partly or completely the internal and surface damages generated in the process of forming, processing and using, so as to eliminate the damage caused by material damage to a large extent. To avoid hidden dangers, prolong the service life of materials and products, and realize the sustainable development of resources. Self-repairing materials, the earliest microcapsules coated with repairing agents and catalysts were implanted in the matrix material to realize the self-repairing function of the material, but the repairing agents embedded in the system are limited, and cannot b...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/10C08G18/48C08G18/61C08G18/65C08G18/32C08G18/38
CPCC08G18/10C08G18/6685C08G18/4854C08G18/6529C08G18/61C08G18/3863C08G18/3844
Inventor 卢珣周佳辉秦锐盛叶明徐敏蒋晓霖王敏慧
Owner SOUTH CHINA UNIV OF TECH
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