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A kind of self-healing polyurethane elastomer without external stimulation and preparation method thereof

A technology of polyurethane elastomer and external stimulation, which is applied in the field of polymer materials, can solve problems such as no relevant literature reports, and achieve the effects of improving application prospects, simple synthesis process, and good mechanical properties

Active Publication Date: 2022-04-01
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the self-healing polymer materials using acylhydrazone bonds need to be stimulated by a certain acid or aniline to achieve self-healing. However, by adding liquid acid and solid acid, the material can be achieved without external acid stimulation after being mechanically damaged. Self-healing polymers have not been reported in the relevant literature

Method used

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  • A kind of self-healing polyurethane elastomer without external stimulation and preparation method thereof
  • A kind of self-healing polyurethane elastomer without external stimulation and preparation method thereof
  • A kind of self-healing polyurethane elastomer without external stimulation and preparation method thereof

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preparation example Construction

[0034]The preparation method of the dihydric alcohol chain extender containing an acylhydrazone bond comprises the following steps: dissolving 12-30 parts of dihydrazide compound in deionized water or an organic solvent, dissolving 15-42 parts of α- The hydroxycarbonyl compound is dissolved in deionized water or an organic solvent, mixed, and reacted at a temperature of 20°C-60°C for 2-4h to obtain a hydroxyl-terminated chain extender containing an acylhydrazone bond. The organic solvent is dimethyl sulfoxide, isopropanol, ethyl acetate, N, N-dimethylformamide, glacial acetic acid or acetone; the mixed weight part of the deionized water and / or organic solvent is 130 - 140 parts by weight.

[0035] The dihydrazide compound is adipic dihydrazide, butenedihydrazide, succinic acid dihydrazide, adipic acid dihydrazide, 1,3-benzoic acid dihydrazide, phthalic acid dihydrazide, terephthalic acid dihydrazide, Phthalic acid dihydrazide, sebacic acid dihydrazide, pyridine-2,6-dicarboxyl...

Embodiment 11

[0041] Example 1.1: Preparation of a dihydric alcohol chain extender containing an acylhydrazone bond

[0042] Get p-Hydroxybenzaldehyde 24.4g (0.2mol-CHO) and dissolve it in 80g absolute ethanol, get succinic acid dihydrazide 14.6g (0.2mol hydrazide group) and dissolve it in 80.0g deionized water; After mixing evenly, react at 25°C for 2.5 hours under stirring at 250 rpm. Filtration under reduced pressure, the resulting product is washed with a 1:1 mixed solution of absolute ethanol and deionized water, and dried to obtain a dihydric alcohol chain extender containing an acylhydrazone bond. The molecular structural formula of the obtained product is: Named as p-hydroxybenzaldehyde succinate dihydrazone, the infrared spectrum of p-hydroxybenzaldehyde succinate dihydrazone is shown in figure 1 , see the H NMR spectrum figure 2 . The product is a white solid powder with a yield of 89%.

Embodiment 12

[0043] Example 1.2: Preparation of a diol chain extender containing an acylhydrazone bond

[0044] Dissolve 13.6g (0.1mol-CHO) of 2-hydroxyacetophenone in 50g of acetone, and dissolve 9.4g of acetylsuccinic acid dihydrazide (0.1mol hydrazide group) in 40.0g of glacial acetic acid; mix the two The solution was mixed evenly and reacted at 60° C. for 4 h under stirring at 250 rpm. Filtrate under reduced pressure, and the resulting product is washed with a 1:1 mixed solution of acetone and glacial acetic acid, and dried to obtain a dihydric alcohol containing an acylhydrazone bond. The molecular structural formula of the obtained product is: Named as 2-hydroxyacetophenone succinate dihydrazone. The product is a white solid powder with a yield of 70%.

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Abstract

The invention provides a self-repairing polyurethane elastomer without external stimulation and a preparation method thereof. The molecular chain of the self-healing polyurethane elastomer polymer without external stimulation contains acylhydrazone bonds. On the basis of self-healing polyurethane, liquid acid and solid acid are added to make the material undergo mechanical damage through the acylhydrazone bonds. Dynamic exchange reaction, without external acid stimulation, self-repair can be achieved at room temperature, the repair conditions are simple, and multiple repairs can be achieved. The polyurethane elastomer containing acylhydrazone bonds synthesized by the invention without external stimulation can realize self-repair after being cut and contacted along the cross section for 72 hours. The self-healing polyurethane elastomer without external stimulation is simple to prepare, the raw materials are readily available and the mechanical properties are excellent, which improves the application prospect of the self-healing polyurethane elastomer.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a self-repairing polyurethane elastomer without external stimulation and a preparation method thereof. Background technique [0002] Polymer materials are widely used in many fields of national economy due to their excellent performance. The product application fields involve light industry, chemical industry, electronics, textile, medical treatment and other fields. However, damage, such as microcracks, inevitably occurs during the use of materials. The generation of microcracks directly leads to the decline of product performance and reduces the service life of the product. In order to prolong the service life of the product and avoid further damage to the material, the self-repairing mechanism of the material microcrack is realized by imitating the self-repair mechanism of biological damage. [0003] The current self-healing methods of self-healing materials can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/76C08G18/75C08G18/40C08G18/48C08G18/44C08G18/42C08G18/12C08G18/32
CPCC08G18/7671C08G18/7614C08G18/755C08G18/4018C08G18/4825C08G18/4804C08G18/4854C08G18/44C08G18/428C08G18/4277C08G18/12C08G18/3825
Inventor 魏燕彦史传英
Owner QINGDAO UNIV OF SCI & TECH
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