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Preparation method of microporous polymethacrylimide foaming agent

A technology of polymethacrylimide and polyether methacrylate diester, which is applied in the field of preparation of microporous polymethacrylimide foam, can solve the problem of low elongation at toughness and uniform fine cells and micropores Poor resistance and other problems, to achieve the effect of increased tensile modulus, good compatibility, and small cell size

Active Publication Date: 2020-02-04
CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is of great significance to prepare the microporous polymethacrylimide foam of uniform pore size. At the same time, the microcellular uniformity of polymethacrylimide foam obtained by the blowing agent currently used is relatively poor, and its toughness and higher High elongation at break with low

Method used

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  • Preparation method of microporous polymethacrylimide foaming agent

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A preparation method of microporous polymethacrylimide foam is prepared according to the following scheme:

[0027] A preparation method of microporous polymethacrylimide foam is prepared according to the following scheme:

[0028] According to the number of parts by mass, 55 parts of (meth)acrylonitrile, 35 parts of (meth)acrylic acid, 5 parts of polyether methacrylate diester, 3 parts of new microcellular foaming agent, 0.2 part of initiator Agent, 0.3 parts of nucleating agent, 1 part of crosslinking agent were added to the reaction kettle, under the protection of nitrogen, the temperature was raised to 35°C, stirred and reacted for 28 hours, then heated to 80°C, and continued to react for 10 hours to obtain a microporous polyformaldehyde The base acrylimide plastic plate is crushed and subjected to an in-mold foaming process to obtain a product, which is then cut and tested.

[0029] The in-mold foaming process is pre-foaming and rapid re-foaming, comprising the fo...

Embodiment 2

[0039] A preparation method of microporous polymethacrylimide foam is prepared according to the following scheme:

[0040] A preparation method of microporous polymethacrylimide foam is prepared according to the following scheme:

[0041] According to the number of parts by mass, 30 parts of (meth)acrylonitrile, 25 parts of (meth)acrylic acid, 1 part of polyether methacrylic diester, 0.5 part of new microcellular foaming agent, 0.01 part of initiator agent, 0.1 part of nucleating agent, 0.1 part of cross-linking agent were added to the reactor, under the protection of nitrogen, the temperature was raised to 30°C, stirred and reacted for 24 hours, then heated to 70°C, and continued to react for 5 hours to obtain a microporous polyformaldehyde The base acrylimide plastic plate is crushed and subjected to an in-mold foaming process to obtain a product, which is then cut and tested.

[0042] The in-mold foaming process is pre-foaming and rapid re-foaming, comprising the following...

Embodiment 3

[0052] A preparation method of microporous polymethacrylimide foam is prepared according to the following scheme:

[0053] According to the number of parts by mass, 65 parts of (meth)acrylonitrile, 70 parts of (meth)acrylic acid, 30 parts of polyether methacrylate diester, 10 parts of new microcellular foaming agent, 2.5 parts of initiator agent, 0.5 parts of nucleating agent, 3 parts of cross-linking agent were added to the reaction kettle, under the protection of nitrogen, the temperature was raised to 40°C, stirred and reacted for 36 hours, then heated to 95°C, and continued to react for 15 hours to obtain microporous polyformaldehyde The base acrylimide plastic plate is crushed and subjected to an in-mold foaming process to obtain a product, which is then cut and tested.

[0054] The in-mold foaming process is pre-foaming and rapid re-foaming, comprising the following steps:

[0055] The obtained polymethacrylimide particles are heated to a pre-expansion temperature of 27...

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Abstract

The invention relates to the field of preparation of new materials, and discloses a preparation method of a microporous polymethacrylimide foaming agent. By using the novel microporous foaming agent,a series of problems are solved that the compatibility of a blended compound foaming agent, an inorganic foaming agent and the like used at present with PMI resin is poor, the foaming agent is easy tomigrate, the foaming pore size is not uniform and the foaming temperature is unstable. The foaming agent has good compatibility with the PMI resin in the using process, and has a stable foaming effect. The prepared polymethacrylimide foam has small and uniform foaming pore size, so that the toughness and elongation at break of the material are improved.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a preparation method of microporous polymethacrylimide foam. Background technique [0002] Polymethacrylimide foam material is a high-performance foam material with good mechanical properties, excellent flame retardancy, fire resistance and other properties. Compared with other types of foam plastics, it does not produce harmful Gas, low density, wide range of performance adjustment, easy to install and disassemble, not only has the characteristics of high temperature resistance, but also has excellent low temperature resistance and brittleness, and has been widely used at home and abroad. [0003] Foaming agents commonly used in polymethacrylimide foam materials are monohydric or polyhydric alcohols, water, itaconic acid, formic acid, N-methylformamide, alkanes with 5-9 carbon atoms, and alkanes with 5-9 carbon atoms. Cycloalkanes, urea, monomethylurea, tetramethylurea, tetr...

Claims

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Application Information

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IPC IPC(8): C08J9/10C08L51/08C08K9/10C08F283/06C08F220/06C08F220/46C08F2/44C08F8/48
CPCC08J9/105C08J9/0038C08J9/0028C08J9/0095C08J9/009C08F283/065C08F8/48C08J2351/08C08J2203/04C08F220/06C08F220/46C08F2/44Y02C20/40
Inventor 张悦李克迪李黄生党辉范晓庆
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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