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Heat-resistant hydroxypropyl-terminated PDMS room-temperature rapid self-repairing elastomer and preparation method and use thereof

A hydroxypropyl sealing, elastomer technology, applied in the direction of adhesive types, polyurea/polyurethane adhesives, coatings, etc., can solve the research reports of rapid self-healing at room temperature that have not yet been flexible and heat-resistant materials. The demand for aerospace heat-resistant materials, without considering the heat-resistant properties of materials, etc., achieves the effects of a wide range of use, long service life and high repair efficiency

Pending Publication Date: 2020-01-31
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the self-healing condition of the self-healing polyurethane elastomer also requires heating, and room temperature self-healing is still not achieved
At the same time, this document does not consider the heat resistance of the material, which cannot meet the needs of aerospace heat-resistant materials.
[0007] According to the existing literature search, there is no research report on the rapid self-healing of flexible heat-resistant materials at room temperature

Method used

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  • Heat-resistant hydroxypropyl-terminated PDMS room-temperature rapid self-repairing elastomer and preparation method and use thereof
  • Heat-resistant hydroxypropyl-terminated PDMS room-temperature rapid self-repairing elastomer and preparation method and use thereof
  • Heat-resistant hydroxypropyl-terminated PDMS room-temperature rapid self-repairing elastomer and preparation method and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]Embodiment 1, the preparation of self-healing elastomer of the present invention

[0044] (1) Synthesis of prepolymer: pour 10mmol of hydroxypropyl-terminated polydimethylsiloxane (HO-PDMS-OH, molecular weight 2000-4000) and 21mmol of isophorone diisocyanate (IPDI) Put it into a flask, add 3000ppm catalyst dibutyltin dilaurate (DBTDL), stir at 80°C with argon for 3 hours, and cool to room temperature to obtain a prepolymer.

[0045] (2) Chain extension reaction: Dissolve 10mmol 4,4'-dihydroxydiphenyl disulfide (HPDS) as a chain extender in 2mL dimethylacetamide, and add dropwise to the prepolymer prepared in step (1) , reacted at 60° C. for 2 h, and added dimethylacetamide after the reaction was completed to prepare the reaction solution into a reaction solution in which the polymer concentration obtained by the chain extension reaction was 30%.

[0046] (3) Pour the reaction solution into a polytetrafluoroethylene mold, keep a vacuum at 90°C for 12h, and remove the res...

Embodiment 2

[0047] Embodiment 2, the preparation of self-healing elastomer of the present invention

[0048] (1) Synthesis of prepolymer: 10mmol of hydroxypropyl-terminated polydimethylsiloxane (HO-PDMS-OH, molecular weight 2000-4000) and 23.625mmol of isophorone diisocyanate (IPDI) Pour it into a flask, add 3000ppm catalyst dibutyltin dilaurate (DBTDL), stir with argon at 80°C for 3 hours, and cool to room temperature to obtain a prepolymer.

[0049] (2) Chain extension reaction: Dissolve 12.5 mmol 4,4'-dihydroxydiphenyl disulfide (HPDS) as a chain extender in 2 mL of dimethylacetamide, and add dropwise to the prepolymer prepared in step (1) The mixture was reacted at 60° C. for 2 hours. After the reaction was completed, dimethylacetamide was added to prepare the reaction solution into a reaction solution with a polymer concentration of 30% obtained by the chain extension reaction.

[0050] (3) Pour the reaction solution into a polytetrafluoroethylene mold, keep a vacuum at 90°C for 12h...

Embodiment 3

[0051] Embodiment 3, the preparation of self-healing elastomer of the present invention

[0052] (1) Synthesis of prepolymer: 10mmol of hydroxypropyl-terminated polydimethylsiloxane (HO-PDMS-OH, molecular weight 2000-4000) and 26.25mmol of isophorone diisocyanate (IPDI) Pour it into a flask, add 3000ppm catalyst dibutyltin dilaurate (DBTDL), stir with argon at 80°C for 3 hours, and cool to room temperature to obtain a prepolymer.

[0053] (2) Chain extension reaction: Dissolve 15mmol 4,4'-dihydroxydiphenyl disulfide (HPDS) as a chain extender in 2mL dimethylacetamide, and add dropwise to the prepolymer prepared in step (1) , reacted at 60° C. for 2 h, and added dimethylacetamide after the reaction was completed to prepare the reaction solution into a reaction solution in which the polymer concentration obtained by the chain extension reaction was 30%.

[0054] (3) Pour the reaction solution into a polytetrafluoroethylene mold, keep a vacuum at 90°C for 12h, and remove the res...

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Abstract

The invention provides a heat-resistant hydroxypropyl-terminated PDMS (polydimethylsiloxane) room-temperature rapid self-repairing elastomer. The elastomer is prepared from hydroxypropyl-terminated PDMS, isocyanate and a chain extender as raw materials, wherein the chain extender is dihydroxy disulfide. The flexible heat-resistant material is endowed with a room-temperature rapid self-repairing function, can rapidly complete self-repairing at room temperature, has high repairing efficiency and good thermal stability, can realize the maintenance-free characteristic of the material, effectivelyimproves the reliability, prolongs the service life, and fills up the blank in the field. The self-repairing elastomer is stable in use performance, wide in use range and long in service life, can beapplied to various systems such as elastomers, coating materials, encapsulating materials, adhesives and the like, particularly outer protective coating layers and flexible part materials applied in high-temperature environments or having heat resistance and ablation resistance requirements, such as heat-proof coating layers of aircrafts, has the advantages of no maintenance, high reliability andthe like, and is excellent in application prospect.

Description

technical field [0001] The invention belongs to the field of intelligent polymer materials, and in particular relates to a heat-resistant hydroxypropyl-terminated PDMS room temperature rapid self-healing elastomer and its preparation method and application. Background technique [0002] Heat-resistant materials play an irreplaceable key role in aerospace vehicles. As the flight speed of aerospace vehicles continues to increase, the aerodynamic thermal environment is getting worse and worse. An effective outer heat-resistant layer can provide the aircraft with severe aerodynamic heating. Sufficient protection to ensure flight safety. However, there are still risks that cannot be effectively avoided if the heat-resistant layer only has heat-resistant properties. Among them, cracks in the heat-resistant layer are a major hidden danger and fatal threat to the flight safety of aerospace vehicles. Therefore, maintaining the structural integrity of the heat-resistant layer is very ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/75C08G18/65C08G18/61C08G18/32C08L75/04C09D175/04C09J175/04
CPCC08G18/3868C08G18/61C08G18/65C08G18/755C08L75/04C08L2201/08C09D175/04C09J175/04
Inventor 邹华维蔡源博陈洋梁梅
Owner SICHUAN UNIV
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