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Bisphenol-containing self-healing thermally-reversible cross-linked polyurethane and production method thereof

A technology for cross-linking polyurethane and bisphenol, applied in the field of polyurethane, can solve the problems of difficult recycling and reuse of chemically cross-linked polyurethane, and achieve the effects of broadening the performance adjustment method, solving environmental problems, and restoring the strength completely.

Active Publication Date: 2019-10-08
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, an object of the present invention is to propose a self-healing thermally reversible crosslinked polyurethane containing bisphenol and its preparation method, which can be used to prepare reproducible, self-repairable thermally reversible crosslinked polyurethane, so that the polyurethane It is expected to be used in self-healing coatings, smart devices, thermoplastic polyurethane elastomers or plastics, etc., solving the problem of difficult recycling of chemically cross-linked polyurethane in the prior art

Method used

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  • Bisphenol-containing self-healing thermally-reversible cross-linked polyurethane and production method thereof
  • Bisphenol-containing self-healing thermally-reversible cross-linked polyurethane and production method thereof
  • Bisphenol-containing self-healing thermally-reversible cross-linked polyurethane and production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0033] React polyethylene glycol, bisphenol S, hexamethylene diisocyanate, and hexamethylene diisocyanate trimer at a molar ratio of functional alcoholic hydroxyl, phenolic hydroxyl, and isocyanate groups of 1:1:2, and the added mass is Triethylenediamine with 0.5% of the total mass of the above-mentioned reactants is used as a catalyst, and it is stirred evenly at 80°C; after the mixture is clarified, pour the mixture into a mold, control the temperature at 60°C, and cure for 12 hours to obtain a reproducible . Self-healing thermally reversible crosslinking polyurethane, the thermally reversible crosslinking temperature of which is above 70°C.

Embodiment 2

[0035] Bisphenol AF, castor oil, and isophorone diisocyanate are reacted at a molar ratio of phenolic hydroxyl group, alcoholic hydroxyl group, and isocyanate group at a molar ratio of 1:1:2.1, and the added mass is 0.5% of the total mass of the above reactants. Use 0.2% dibutyltin dilaurate as a catalyst, add tetrahydrofuran to accelerate dissolution, and stir evenly; after the mixture is clarified, pour the mixture into a mold, control the temperature at 50°C, and cure for 7 hours to obtain reproducible, self-repairing Thermally reversible crosslinking polyurethane, its thermally reversible crosslinking temperature is above 90°C.

Embodiment 3

[0037]The molar ratio of bisphenol A, polybutylene adipate diol, isophorone diisocyanate, and hexamethylene diisocyanate to functional group phenolic hydroxyl, alcoholic hydroxyl, and isocyanate groups is 1:1:1.9 Reaction, adding 0.5% triethylenediamine and 0.1% dibutyltin dilaurate as a catalyst in the total mass of the above-mentioned reactants, stirring evenly at 90°C; after the mixture is clarified, pour the mixture into a mold, and control the temperature to 90°C, curing for 3 hours, you can get reproducible, self-healing thermally reversible crosslinked polyurethane, and its thermally reversible crosslinking temperature is above 120°C.

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Abstract

The invention discloses bisphenol-containing self-healing thermally-reversible cross-linked polyurethane and a production method thereof. The method comprises the steps of mixing a bisphenol compound,a polyisocyanate compound, a polyhydric alcohol compound and a catalyst, and conducting curing to obtain the bisphenol-containing self-healing thermally-reversible cross-linked polyurethane. By adopting the method, the re-processing self-healing thermally-reversible cross-linked polyurethane can be produced, so that the polyurethane is advantageously used for the aspect of self-healing coatings,intelligent devices, thermoplastic polyurethane elastomers, plastic or the like, and the problem that in the prior art, chemical cross-linked polyurethane is hard to recycle is solved.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular to a self-healing thermally reversible cross-linked polyurethane containing bisphenol and a preparation method thereof. Background technique [0002] As a general-purpose polymer material, polyurethane plays an important role in industry, military and civil applications, such as coatings, machinery, construction, aerospace, electronics and many other fields. Different types of polyols and isocyanate compounds endow it with rich structures. and performance adjustability. The urethane group itself has the ability to form hydrogen bonds and can provide a certain amount of physical crosslinking, but linear polyurethane cannot meet some application requirements due to its easy creep and other reasons. The introduction of chemical cross-linking can improve the mechanical and weather resistance properties of polyurethane. However, traditional chemical cross-linking polyurethane faces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/79C08G18/76C08G18/73C08G18/66C08G18/48C08G18/42C08G18/36C08G18/32
CPCC08G18/3206C08G18/3215C08G18/36C08G18/3812C08G18/3872C08G18/4238C08G18/4825C08G18/4854C08G18/664C08G18/6666C08G18/6674C08G18/73C08G18/765C08G18/792
Inventor 徐军史家昕郭宝华
Owner TSINGHUA UNIV
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