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Low-moisture-absorption-rate polymethacrylimide foam and preparation method thereof

A technology of polymethacrylimide and low moisture absorption, which is applied in the field of polymethacrylimide foam with low moisture absorption and its preparation, can solve problems such as loss, potential safety hazards, and reduced thermal insulation performance of foam materials, achieving Low moisture absorption rate, simple and easy preparation process, and the effect of avoiding the danger of use

Pending Publication Date: 2022-04-22
山东天复新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, the preparation of PMI foam materials requires the use of highly toxic raw materials such as acrylonitrile or methacrylonitrile, which are not easy to obtain, and there are great safety hazards in the process of use. On the other hand, through traditional preparation The PMI foam molecules prepared by the method contain a large number of N-H hydrophilic groups, resulting in a high moisture absorption rate of the material, and finally the heat insulation performance of the foam material is greatly reduced or even lost. The above factors seriously limit the production and wide application of PMI foam materials.

Method used

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  • Low-moisture-absorption-rate polymethacrylimide foam and preparation method thereof
  • Low-moisture-absorption-rate polymethacrylimide foam and preparation method thereof
  • Low-moisture-absorption-rate polymethacrylimide foam and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The polymethacrylimide foam with low moisture absorption rate described in this embodiment 1, the polymethacrylimide has the following repeating structural unit:

[0029]

[0030] Among them, R represents ethyl, 18000≤n≤22000.

[0031] The polymethacrylimide foam with low moisture absorption rate described in the present embodiment 1, in terms of mass percentage, the raw material composition is as follows:

[0032]

[0033] The preparation method of the low moisture absorption polymethacrylimide foam described in the present embodiment 1 is made up of the following steps:

[0034] Weigh 90g ethylamine, 154g methacrylic anhydride, 172g methacrylic acid, 0.2g isopropanol, 0.5g ammonium phosphate, 0.3g azobisisobutyronitrile at room temperature and normal pressure, and mix them uniformly, Obtain a mixed liquid; heat the above mixed liquid to 80°C and react for 5 hours to obtain a plexiglass plate; then put the above-mentioned plexiglass plate into a blast oven at 18...

Embodiment 2

[0037] The polymethacrylimide foam with low moisture absorption rate described in Example 2, the polymethacrylimide has the following repeating structural unit:

[0038]

[0039] Wherein, R represents propyl group, 18000≤n≤22000.

[0040] The polymethacrylimide foam with low moisture absorption rate described in the present embodiment 2, in terms of mass percentage, the raw material composition is as follows:

[0041]

[0042] The preparation method of the polymethacrylimide foam with low moisture absorption rate described in this embodiment 2 consists of the following steps:

[0043] Weigh 104g propylamine, 154g methacrylic anhydride, 172g methacrylic acid, 0.15g propanol, 0.5g phosphoric acid ester, 0.3g dibenzoyl peroxide at room temperature and normal pressure, and mix them uniformly to obtain a mixed Liquid; heat the above mixed liquid to 75°C and react for 5 hours to obtain a plexiglass plate; then put the above plexiglass plate into a blast oven at 185°C for foam...

Embodiment 3

[0046] The low moisture absorption polymethacrylimide foam described in this embodiment 3, the polymethacrylimide has the following repeating structural unit:

[0047]

[0048] Among them, R represents ethyl, 18000≤n≤22000.

[0049] The polymethacrylimide foam with low moisture absorption rate described in this embodiment 3, in terms of mass percentage, has the following raw material composition:

[0050]

[0051] The preparation method of the polymethacrylimide foam with low moisture absorption rate described in this embodiment 3 consists of the following steps:

[0052] Weigh 90g ethylamine, 154g methacrylic anhydride, 172g methacrylic acid, 0.2g butanol, 0.4g phosphoric acid ester, 0.25g dibenzoyl peroxide at room temperature and normal pressure, and mix them uniformly to obtain Mix liquid; heat the above mixed liquid to 75°C, react for 5h to obtain a plexiglass plate; then put the above plexiglass plate into a blast oven at 180°C for foaming to obtain a PMI foam pla...

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Abstract

The invention belongs to the technical field of high-performance polymer foam, and particularly relates to low-moisture-absorption-rate polymethacrylimide foam and a preparation method thereof. An amino compound, methacrylic anhydride and methacrylic acid serve as monomers and are mixed with a flame retardant, a foaming agent and an initiator, a uniform mixed solution is obtained, and the PMI foam material with the low moisture absorption rate is prepared through polymerization and foaming processes. The method comprises the following steps: reacting an amino compound with methacrylic anhydride to generate R-substituted methacrylamide, then carrying out free radical polymerization on the R-substituted methacrylamide and methacrylic acid to form a polymer plate, and finally carrying out high-temperature foaming to obtain the PMI foam. And the obtained PMI foam does not contain N-H hydrophilic groups, so that the moisture absorption rate of the PMI foam material can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of polymer foam preparation, and in particular relates to a polymethacrylimide foam with low moisture absorption rate and a preparation method thereof. Background technique [0002] Polymethacrylimide foam has good sound absorption, heat insulation, high and low temperature resistance and other properties, and is widely used in aerospace, high-speed trains and other fields. However, in the prior art, the preparation of PMI foam materials requires the use of highly toxic raw materials such as acrylonitrile or methacrylonitrile, which are not easy to obtain, and there are great safety hazards in the process of use. On the other hand, through traditional preparation The PMI foam molecules prepared by the method contain a large number of N-H hydrophilic groups, resulting in a high moisture absorption rate of the material, and finally greatly reducing or even losing the heat insulation performance of the foam mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/54C08F220/06C08J9/14C08L33/24C08K3/32C08K5/521C08K3/02
CPCC08F220/54C08J9/142C08J9/0066C08J9/0038C08J2333/24C08J2203/12C08F220/06
Inventor 张士华韩世辉张传扬
Owner 山东天复新材料有限公司
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