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Electric heating self-repairing polyurethane elastomer and preparation method thereof

A technology of polyurethane elastomer and polyurethane prepolymer, which is applied in the field of polymer materials and achieves the effects of wide application prospects, simple structure and easy raw materials

Inactive Publication Date: 2020-05-29
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are no reports in the relevant literature on the use of acylhydrazone bonds to prepare bulk polymers that do not contain solvents and can achieve spontaneous detection and self-repair only under the condition of electricity.

Method used

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  • Electric heating self-repairing polyurethane elastomer and preparation method thereof
  • Electric heating self-repairing polyurethane elastomer and preparation method thereof
  • Electric heating self-repairing polyurethane elastomer and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0033] The preparation method of the dihydric alcohol chain extender containing acylhydrazone bond according to the present invention comprises the following steps: dissolving 15-30 parts by weight of hydroxy carbonyl compound in an organic solvent, dissolving 10-20 parts by weight of diacyl The hydrazine compound is dissolved in deionized water, mixed, and reacted at 20°C-60°C for 2 to 4 hours to obtain a dihydric alcohol chain extender containing an acylhydrazone bond; wherein, the organic solvent is dimethyl sulfoxide, N, N-dimethylformamide, isopropanol, acetone, absolute ethanol or ethyl acetate, the sum of the parts by weight of the deionized water and the organic solvent is 120-140 parts.

[0034] The dihydrazide compound is malonic acid dihydrazide, pimelic acid hydrazide, suberic dihydrazide, pentanedihydrazide, sebacic acid dihydrazide, dodecanedicarboxylic acid dihydrazide, p-phenylene Any one or a mixture of dicarboxylic acid dihydrazide, phthalic acid dihydrazide,...

Embodiment 11

[0039] Example 1.1: Preparation of succinic acid dihydrazone diol chain extender

[0040] Get p-Hydroxybenzaldehyde 8.9g (0.08mol-CHO) and dissolve in 48.8g absolute ethanol, get succinic acid dihydrazide 7.52g (hydrazide group 0.08mol) and dissolve in 87.0g deionized water; Both mix The solution was mixed evenly and reacted at 45° C. for 3 h under stirring at 250 rpm. Filtration under reduced pressure, the resulting product is washed successively with 150g ethanol (3 times, each 50g) at room temperature, and after drying, obtain a dibasic alcohol containing an acylhydrazone bond, which is p-Hydroxybenzaldehyde succinic acid diformylhydrazone . The product is a white solid powder. Productive rate 86%, the molecular structural formula of the product obtained is as follows:

[0041]

Embodiment 12

[0042] Example 1.2: Preparation of succinic acid dihydrazone diol chain extender

[0043] Dissolve 12.16g of vanillin (0.08mol-CHO) in 48.8g of absolute ethanol, and dissolve 7.52g of succinic acid dihydrazide (0.08mol of hydrazide group) in 87.0g of deionized water; mix the mixture After uniformity, react at 35°C for 2h under stirring at 250rpm. Filtrate under reduced pressure, and the obtained product is washed successively with 150 g of ethanol (3 times, 50 g each) at room temperature, and dried to obtain a dihydric alcohol containing an acylhydrazone bond, which is vanillin succinic acid diformylhydrazone. The infrared spectrum of vanillin succinic acid diformylhydrazone is shown in figure 1 , see the NMR spectrum figure 2 ; The product is a white solid powder. Productive rate 96%, the molecular structural formula of the product obtained is as follows:

[0044]

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Abstract

The invention provides an electric heating self-repairing polyurethane elastomer and a preparation method thereof. The electric heating self-repairing polyurethane elastomer is prepared from an acylhydrazone bond-containing dihydric alcohol chain extender and a polyurethane prepolymer, a series of conductive fillers are added to endow the elastomer with conductivity, and polyaniline is added to endow the elastomer with self-repairing capability only by heating. After the self-repairing polyurethane elastomer is mechanically damaged, the heat generated at the fracture is increased to 120 DEG Cor above under the power-on condition, and under the catalytic action of polyaniline, an acylhydrazone bond on a polymer cross-linked molecular chain is promoted to achieve self-repairing of the material through a dynamic exchange reaction. The energized self-repairing cross-linked polyurethane elastomer material is simple to prepare, can realize self-repairing only under an energized condition, is simple and convenient to repair and easy in steps, does not damage the material, and expands the application range of self-repairing polyurethane.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to an electrified heating self-repairing polyurethane elastomer and a preparation method thereof. Background technique [0002] Self-healing materials are a new type of material that can repair itself when an object is damaged. At present, polymer-based self-healing systems can be divided into two types: one is external aid self-healing, that is, microcapsules, liquid-core fibers or capillary networks loaded with repairing agents are embedded in the matrix material, and external damage causes microcapsules, liquid-cored fibers, etc. The core fiber and capillary network are broken, and the liquid repair agent is released into the crack and then solidifies, thereby completing the repair of the crack; one is intrinsic self-healing, which is to introduce reversible chemical bonds (including reversible covalent bonds and reversible non-covalent bonds) into polymerization In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L75/08C08L75/04C08L75/06C08L79/02C08K3/04C08G18/66C08G18/48C08G18/38C08G18/44C08G18/42
CPCC08L75/08C08L75/06C08L75/04C08G18/6666C08G18/66C08G18/4804C08G18/4833C08G18/4854C08G18/4018C08G18/3823C08G18/44C08G18/4277C08K2201/001C08L79/02C08K3/042C08K3/04
Inventor 魏燕彦刘杨
Owner QINGDAO UNIV OF SCI & TECH
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