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A kind of polyurethane/polyimide porous composite material and preparation method thereof

A porous composite material and polyimide technology, applied in the field of composite materials, can solve the problems of not being able to meet the requirements of lightweight materials, limiting the use range of polyurethane/polyimide composite materials, not having a porous structure and light weight, etc.

Active Publication Date: 2020-12-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese invention patent (application number 201510621741.6) uses polyimide powder as a filler and combines it with polyurethane elastomer to produce a heat-resistant polyurethane / polyimide composite material, but this composite material is an elastomer composite material. Without the characteristics of porous structure and light weight, it cannot meet the light weight requirements of some special fields, which will seriously limit the application range of polyurethane / polyimide composite materials

Method used

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  • A kind of polyurethane/polyimide porous composite material and preparation method thereof
  • A kind of polyurethane/polyimide porous composite material and preparation method thereof
  • A kind of polyurethane/polyimide porous composite material and preparation method thereof

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Effect test

Embodiment 1

[0052] Embodiment 1 Preparation of polyurethane / polyimide porous composite material of the present invention

[0053](1) Remove water and small molecules from polytetrahydrofuran diol 2000 under vacuum conditions at 120°C, take 40.0g and put it into a three-necked flask, heat up to 70°C, add 10.2g of 2,4-toluene diisocyanate, and pass through N 2 and stirring, after reacting for 1.5 hours, add 1.2 g of chain extender trimethylolpropane, stir for 3 to 5 minutes and mix evenly to obtain a polyurethane prepolymer / chain extender mixture, which is poured into a clean container for storage until use.

[0054] (2) At room temperature, take 6g of polyamic acid and add it to 194g of deionized water, then dropwise add 2.86g of triethylamine, stir evenly with a magnetic force to obtain the ammonium salt of polyamic acid with a mass ratio of polyamic acid to water of 3:97 (PAS) aqueous solution.

[0055] Prepare a mixture of dry ice and ethanol as a freezing liquid in a large container, ...

Embodiment 2

[0060] Embodiment 2 Preparation of polyurethane / polyimide porous composite material of the present invention

[0061] (1) Remove water and small molecules from polytetrahydrofuran diol 2000 under vacuum conditions at 120°C, take 40.0g and put it into a three-necked flask, heat up to 70°C, add 10.2g of 2,4-toluene diisocyanate, and pass through N 2 Stirring was started, and after 1.5 hours of reaction, 1.2 g of chain extender trimethylolpropane was added to obtain a polyurethane prepolymer / chain extender mixture, which was poured into a clean container for storage until use.

[0062] (2) At room temperature, take 6g of polyamic acid and add it to 194g of deionized water, then dropwise add 2.86g of triethylamine, stir evenly with a magnetic force to obtain the ammonium salt of polyamic acid with a mass ratio of polyamic acid to water of 3:97 aqueous solution.

[0063] Prepare a mixture of dry ice and ethanol as a freezing liquid in a large container, and prepare a freezing liqu...

Embodiment 3

[0068] Embodiment 3 Preparation of polyurethane / polyimide porous composite material of the present invention

[0069] (1) Remove water and small molecules from polytetrahydrofuran diol 2000 under vacuum conditions at 120°C, take 40.0g and put it into a three-necked flask, heat up to 70°C, add 10.2g of 2,4-toluene diisocyanate, and pass through N 2 Stirring was started, and after 1.5 hours of reaction, 1.2 g of chain extender trimethylolpropane was added to obtain a polyurethane prepolymer / chain extender mixture, which was poured into a clean container for storage until use.

[0070] (2) At room temperature, take 6g of polyamic acid and add it to 194g of deionized water, then dropwise add 2.86g of triethylamine, stir evenly with a magnetic force to obtain the ammonium salt of polyamic acid with a mass ratio of polyamic acid to water of 3:97 aqueous solution.

[0071] Prepare a mixture of dry ice and ethanol as a freezing liquid in a large container, and prepare a freezing liqu...

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Abstract

The invention discloses a preparation method of a polyurethane / polyimide porous composite material, which belongs to the field of composite materials. The preparation method comprises the following steps: (1) adding polyol to polyisocyanate, reacting for 1-3 hours, and adding chain extension (2) dissolving the polyurethane prepolymer / chain extender mixture in a solvent to obtain a solution of the polyurethane prepolymer; (3) anisotropic polyimide The amine airgel is impregnated in the solution of the polyurethane prepolymer, and the chain is extended and solidified to obtain the polyurethane / polyimide porous composite material. The present invention skillfully impregnates the anisotropic polyimide airgel in the polyurethane prepolymer to prepare a polyurethane / polyimide porous composite material with a double continuous matrix structure, which effectively improves the durability of the polyurethane Thermal properties broaden its operating temperature range and have broad application prospects in the fields of substance adsorption, substance separation, heat insulation protection, vibration reduction and buffering, etc.

Description

technical field [0001] The invention belongs to the field of composite materials, and in particular relates to a polyurethane / polyimide porous composite material and a preparation method thereof. Background technique [0002] Polyurethane (PU) is a polymer with urethane structural units, usually obtained by the reaction of polyols and polyisocyanates, and is widely used in elastomers, foams, adhesives, coatings and other fields. Polyurethane foam is one of the main uses of polyurethane, which has the advantages of light weight, heat and sound insulation, and vibration reduction. Due to the poor thermal stability of polyurethane, it is easy to decompose at high temperature, causing its performance to drop sharply. Therefore, its long-term use temperature does not exceed 80°C, and its short-term use temperature does not exceed 120°C, which greatly limits the application of polyurethane foam materials. In order to improve the heat resistance of PU materials, commonly used impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/42C08L79/08
CPCC08J9/42C08J2379/08C08J2475/06C08J2475/08
Inventor 刘鹏波余智吴鹏陈少康邹华维
Owner SICHUAN UNIV
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