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Self-repaired organic silicon modified polyurethane elastomer and preparation method thereof

A polyurethane elastomer and silicone technology, applied in the field of polyurethane elastomer, can solve the problems of lack of mechanical properties, heat resistance, weather resistance, etc., and achieve the effect of high-efficiency self-healing

Inactive Publication Date: 2017-08-22
SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although some progress has been made in the research and application of self-healing polymers containing disulfide bonds, there is still a lack of materials that have excellent mechanical properties, heat resistance, and weather resistance, and can be used in mild environments at high temperatures. Self-healing materials with high repair efficiency

Method used

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  • Self-repaired organic silicon modified polyurethane elastomer and preparation method thereof
  • Self-repaired organic silicon modified polyurethane elastomer and preparation method thereof
  • Self-repaired organic silicon modified polyurethane elastomer and preparation method thereof

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preparation example Construction

[0041] In the preparation of polyurethane prepolymer and polyurethane solution, the solvent used when carrying out the solution reaction can be selected from toluene, tetrahydrofuran, acetone, chloroform, dimethyl sulfoxide, N,N-dimethylformamide (DMF ) and one or more of N,N-dimethylacetamide.

[0042]In the preparation of the polyurethane prepolymer, preferably, the diisocyanate group-containing monomer and the active group-terminated polydimethylsiloxane are reacted in solution at 50-100° C. for 2-5 hours to prepare the polyurethane prepolymer. In the preparation of the polyurethane solution, it is preferred to continue to react the obtained polyurethane prepolymer with the disulfide bond-containing monomer in the solution at 50-100° C. for 3-9 hours to prepare the final product Polyurethane copolymer solution.

[0043] In the step of drying the prepared polyurethane solution, the obtained polyurethane solution is cast and dried to prepare a polyurethane elastomer. Speci...

preparation Embodiment 1

[0051] Take 0.336g (2mmol) of 1,6-hexamethylene diisocyanate dissolved in acetone and pour it into a three-necked flask, then take 3g (1mmol) of amino-terminated polydimethylsiloxane dissolved in acetone, drop slowly Add it to the three-necked flask, at 60°C, under stirring at 300rpm, vacuumize and pass through nitrogen to react for 3h to obtain the isocyanate group-terminated prepolymer; then take 0.154g (1mmol) 2,2'-dithiodiethanol , mixed evenly with acetone and then added to the prepolymer to react for 6 hours to obtain a polyurethane copolymer solution.

[0052] After the reaction, the solution was transferred to a polytetrafluoroethylene mold, and dried in an oven at 90° C. for 12 hours to obtain polyurethane elastomer PU-1.

[0053] Figure 1-3 The infrared spectrogram, thermogravimetric analysis (TGA) chart and Raman spectrogram of the obtained PU-1 polyurethane elastomer are shown respectively. The infrared spectrum of polyurethane elastomer PU-1 is tested by Bruker...

preparation Embodiment 2

[0055] Take 0.252g (1.5mmol) of 1,6-hexamethylene diisocyanate and dissolve it in acetone and pour it into a three-necked flask, then take 3g (1mmol) of amino-terminated polydimethylsiloxane and dissolve it in acetone, slowly Add it dropwise into a three-necked flask, at 60°C, under stirring at 300rpm, vacuumize and feed nitrogen for 3 hours to obtain an isocyanate-terminated prepolymer; then take 0.077g (0.5mmol) of 2,2'-disulfide Ethanol, mixed evenly with acetone, was added to the prepolymer to react for 6 hours to obtain a polyurethane copolymer solution.

[0056] After the reaction, the solution was transferred to a polytetrafluoroethylene mold, and dried in an oven at 90° C. for 12 hours to obtain polyurethane elastomer PU-2.

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Abstract

The invention provides a self-repaired organic silicon modified polyurethane elastomer based on disulfide bonds, and a preparation method thereof. The preparation method comprises the following steps: enabling a monomer containing a diisocyanate group to react with active group capped polydimethylsiloxane so as to obtain a polyurethane prepolymer; and further performing reaction with a monomer containing the disulfide bonds, and synthesizing, thereby obtaining the self-repaired organic silicon modified polyurethane elastomer based on the disulfide bonds. The self-repaired organic silicon modified polyurethane elastomer which is modified with organic silicon has improved thermal resistance, water resistance and flexibility, and has high self-repairing efficiency as the disulfide bonds are introduced into a main polymer chain.

Description

technical field [0001] The invention relates to a polyurethane elastomer, in particular to a self-repairing organosilicon-modified polyurethane elastomer and a preparation method thereof. Background technique [0002] Polyurethane materials generally have good hardness and elasticity, wear resistance, impact resistance and tear strength, etc., but their high and low temperature resistance, heat aging resistance, and hydrophobicity are not ideal. Organosilicon compounds generally have good properties such as heat resistance, weather resistance, electrical insulation, radiation resistance, and organic solvent resistance, but they also have shortcomings, such as poor mechanical properties, insufficient adhesion, and high cost. [0003] Many organisms in nature can self-repair and heal after local damage. Therefore, it is hoped that the self-repair mechanism can be introduced into polymer materials to prepare smart materials with self-diagnosis and self-healing damage properties...

Claims

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Application Information

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IPC IPC(8): C08G18/73C08G18/65C08G18/61C08G18/32C08G18/10
CPCC08G18/73C08G18/10C08G18/61C08G18/3863
Inventor 张国平吴新秀李金辉孙蓉
Owner SHENZHEN INST OF ADVANCED TECH CHINESE ACAD OF SCI
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