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A kind of polymethacrylimide foam with uniform pores and preparation method thereof

A polymethacrylimide and foam technology, which is applied to the field of polymethacrylimide foam and its preparation, can solve the problems of increased cost, complicated procedures, insignificant effects, etc., and achieves increased intermolecular force, The effect of improving heat resistance

Active Publication Date: 2020-11-13
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 use of nucleating agents is a relatively common method. Nucleating agents are divided into two types: soluble and insoluble. Soluble nucleating agents generally have a solubility limit and cannot be added in large quantities, so the effect is not significant; although insoluble nucleating agents are not affected by addition The amount is significant, but it often needs to be used with anti-sedimentation agent, which makes the process complicated and increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A preparation method of polymethacrylimide foam with uniform pores, comprising the steps of:

[0032] According to the number of parts by mass, 50 parts of acrylic acid, 50 parts of acrylonitrile, 5 parts of the third comonomer, 3 parts of initiator, 5 parts of foaming agent, 3 parts of crosslinking agent, 3 parts of nucleating agent, 3 parts of isobutylene Copper ethyl acetoacetate and bicyclo[2.2.2]zinc-2-ene-2,3-dicarboxylic anhydride doped high-temperature-resistant surfactant were mixed uniformly, reacted in a water bath at 50°C for 200 hours, and then heated at 100 ℃ treatment for 50 hours to obtain a transparent prepolymer; the transparent prepolymer was treated at 170 ℃ for 3 hours and at 220 ℃ for 3 hours to obtain a PMI foam.

[0033] The high-temperature-resistant surfactant containing copper acetoacetate ethyl methacrylate and bicyclo[2.2.2]zinc-2-ene-2,3-dicarboxylic anhydride doped high-temperature-resistant surfactant is prepared according to the followin...

Embodiment 2

[0042] A preparation method of polymethacrylimide foam with uniform pores, comprising the steps of:

[0043] According to the mass parts, 40 parts of acrylic acid, 40 parts of methacrylonitrile, 1 part of the third comonomer, 1 part of initiator, 1 part of foaming agent, 1 part of crosslinking agent, 1 part of nucleating agent, 1 part of Mix the high-temperature-resistant surfactant containing copper ethyl methacrylate acetoacetate and bicyclo[2.2.2]zinc-2-ene-2,3-dicarboxylic anhydride doped evenly, react in a water bath at 30°C for 30 hours, and then Treat the transparent prepolymer at 80°C for 10 hours; treat the transparent prepolymer at 140°C for 1 hour, and treat the transparent prepolymer at 200°C for 1 hour to obtain a PMI foam.

[0044] The high-temperature-resistant surfactant containing copper acetoacetate ethyl methacrylate and bicyclo[2.2.2]zinc-2-ene-2,3-dicarboxylic anhydride doped high-temperature-resistant surfactant is prepared according to the following sche...

Embodiment 3

[0053] A preparation method of polymethacrylimide foam with uniform pores, comprising the steps of:

[0054] According to the mass parts, 60 parts of methacrylic acid, 60 parts of methacrylonitrile, 10 parts of the third comonomer, 5 parts of initiator, 10 parts of blowing agent, 5 parts of crosslinking agent, 5 parts of nucleating agent, Mix 5 parts of high-temperature-resistant surfactant containing copper acetoacetate ethyl methacrylate and bicyclo[2.2.2]zinc-2-ene-2,3-dicarboxylic acid anhydride doped evenly, and react in a water bath at 80°C for 500 hours , and then treated at 130°C for 100 hours to obtain a transparent prepolymer; after treating the transparent prepolymer at 190°C for 5 hours, and at 240°C for 5 hours, a PMI foam was obtained.

[0055] The high-temperature-resistant surfactant containing copper acetoacetate ethyl methacrylate and bicyclo[2.2.2]zinc-2-ene-2,3-dicarboxylic anhydride doped high-temperature-resistant surfactant is prepared according to the f...

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PUM

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Abstract

The invention relates to the field of new material preparation, and concretely relates to polymethacrylimide foam with uniform pores and a preparation method thereof and a product thereof. The methodis capable of mixing (methyl)acrylic acid, (methyl)acrylonitrile, a third comonomer, an initiator, a foaming agent, a crosslinking agent, a nucleating agent, and a zinc-copper-doped high temperature-resistant surfactant, and performing a reaction to obtain a transparent prepolymer; the transparent prepolymer is heat-treated, and the polymethacrylimide foam having uniform pores is obtained. The surfactant used in the method does not affect the reaction, so the original preparation process does not need to be changed, and the method is simple and convenient; different active agent amounts can beselected according to different foaming temperatures, or complex formulation is carried out, the surface tension during foaming can be regulated and controlled to prepare pore sizes with different sizes, and fine and uniform pores can be obtained; the introduction of atoms such as fluorine and silicon can increase the intermolecular force, and the heat resistance of the material can be increasedat a certain extent.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a polymethacrylimide foam with uniform pores and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam is a light-weight, high-strength heat-resistant foam, generally used as the core material of sandwich structure composite materials, which can be cured with fibers, resins, prepregs, etc. , Molding, (high pressure) resin transfer molding and other processes. [0003] CN105085767A discloses a polyacrylimide foam material prepared by using an ester ammonium salt precursor, its preparation method and application. In the invention, during the preparation of polyacrylimide foam prepolymer, the ester ammonium salt precursor of PMR polyimide is added, and the endothermic reaction of amidation is used to prepare the polyacrylimide prepolymer The exothermic reaction of free radical polymerization in the process is matched to achieve the purpose of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/46C08F220/56C08F220/40C08F220/14C08F2/24C08F2/30C08J9/04
CPCC08F2/24C08F2/30C08F220/06C08F220/46C08J9/04C08J2333/06C08F220/56C08F220/40C08F220/14
Inventor 胡爱军徐文生孟佳丽李克迪常艺李锋范晓庆
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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