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A kind of polymethacrylimide foam prepared by microwave heating in-mold foaming and its preparation method

A polymethacrylimide and microwave heating technology, which is applied in the field of material preparation, can solve the problems of low production efficiency, slow temperature rise, low re-foaming efficiency, etc., and achieves improved production efficiency, increased layer thickness, and increased heating time. the effect of shortening

Active Publication Date: 2022-05-27
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

The above method has the following disadvantages: (1) in order to achieve uniform heat transfer and foaming in the pre-foaming process, the particle layer is thin, so the production efficiency is low; (2) in the re-foaming process, the mold heats up slowly under hot air, resulting in Inefficient refoaming

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Pre-foaming: spread the 0.2-4mm polymethacrylimide particles on the microwave equipment with a thickness of 0.25mm, the microwave power is 2KW, and the pre-foaming time is 10min;

[0029] (2) Re-foaming: the obtained pre-expanded particles are filled into the mold, the mold is put into the microwave equipment, the microwave power is 3KW, and the re-foaming time is 10min;

[0030] (3) Cooling and demoulding: natural cooling at room temperature for 30min, demoulding to obtain a special-shaped polymethacrylimide foam.

[0031] The re-foaming mold described in step (2) is prepared from a gallium thulium doped microwave permeable material, which is prepared according to the following scheme:

[0032] According to the parts by mass, 45 parts of methoxyxylene, 25 parts of cresol and 0.5 part of malonic acid were added to the reaction kettle, and after stirring evenly, the temperature was raised to 130 ° C to react, and no water was formed after the reaction for 3 hours. C...

Embodiment 2

[0035] (1) Pre-foaming: spread the 0.2-4mm polymethacrylimide particles on the microwave equipment with a thickness of 20.2mm, the microwave power is 2.6KW, and the pre-foaming time is 6min;

[0036] (2) Re-foaming: the obtained pre-expanded particles are filled into the mold, and the mold is put into the microwave equipment, the microwave power is 3.6KW, and the re-foaming time is 11min;

[0037] (3) Cooling and demoulding: natural cooling at room temperature for 36 minutes, and demolding to obtain a special-shaped polymethacrylimide foam.

[0038] The re-foaming mold described in step (2) is prepared from a gallium thulium doped microwave permeable material, which is prepared according to the following scheme:

[0039]According to the parts by mass, 40 parts of methoxyxylene, 20 parts of cresol and 0.2 part of malonic acid were added to the reaction kettle, and after stirring evenly, the temperature was raised to 100 ° C to react, and no water was formed after the reaction f...

Embodiment 3

[0042] (1) Pre-foaming: Spread 0.2-4mm polymethacrylimide particles on the microwave equipment with a thickness of 40.15mm, the microwave power is 3.2KW, and the pre-foaming time is 4min;

[0043] (2) Re-foaming: the obtained pre-expanded particles are filled into the mold, and the mold is put into the microwave equipment, the microwave power is 4.2KW, and the re-foaming time is 14min;

[0044] (3) Cooling and demoulding: natural cooling at room temperature for 42 minutes, and demolding to obtain a special-shaped polymethacrylimide foam.

[0045] The re-foaming mold described in step (2) is prepared from a gallium thulium doped microwave permeable material, which is prepared according to the following scheme:

[0046] According to the parts by mass, 50 parts of methoxyxylene, 30 parts of cresol and 0.8 part of malonic acid were added to the reaction kettle, and after stirring evenly, the temperature was raised to 150 ° C to react, and no water was formed after the reaction for...

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Abstract

The invention relates to the field of preparation of new materials, and discloses a polymethacrylimide foam prepared by foaming in a mold by microwave heating and a preparation method thereof, comprising the following steps: 1. Passing polymethacrylimide particles through microwaves Pre-expanding by heating; 2. Filling the pre-expanded particles into the mold, and then foaming by microwave heating; 3. Cooling and demolding to obtain special-shaped polymethacrylimide foam. The invention solves the problems of slow temperature rise due to the low heat transfer rate of polymethacrylimide plastic particles, uneven particle foaming after the thickness of the layer is increased in the pre-foaming process, and low efficiency in the production process. The temperature rise rate of the particles in the mold during the foaming process greatly improves the production efficiency of pre-foaming and re-foaming; this is of great significance to the polymethacrylimide foam prepared by the in-mold foaming method.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a polymethacrylimide foam prepared by in-mold foaming by microwave heating and a preparation method thereof. Background technique [0002] The side chain of polymethacrylimide foam contains a large number of carboxyl and nitrile groups with high polarity, and the intermolecular force is large, resulting in excellent mechanical properties and high specific strength. The imidization reaction further improves the mechanical properties and heat resistance of the material. Therefore, polymethacrylimide has high specific strength and high heat resistance. Due to its excellent performance, polymethacrylimide foam is widely used in aerospace, rail transit, wind power blades, medical bed boards and other fields, and has great social value. [0003] Patent CN105793338A provides a method for preparing pre-expanded poly(meth)acryimide (P(M)I) particles which can be further processed into...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/00C08L33/02
CPCC08J9/00C08J2333/02
Inventor 范晓庆董艳丽李克迪徐文生常艺李峰毛敏梁孟佳丽
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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