Polymethacrylimide foam material and preparation method thereof

The technology of polymethacrylimide and foam material is applied in the field of polymethacrylimide foam material and its preparation, which can solve the problem of introducing impurities into polymerization inhibitor and reducing the purity of polymethacrylimide foam material. , complex preparation methods, etc., to achieve the effect of reducing production costs, significant economic and social benefits, and high product purity

Inactive Publication Date: 2010-01-20
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This preparation method is slightly complicated, and impurities may be introduced during the addition, separation

Method used

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  • Polymethacrylimide foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Mixing: Mix 15g methacrylic acid, 50g methacrylamide, 0.1g potassium persulfate, 0.8g carbonamide, 0.2g hexanol, 0.1g magnesium methacrylate, and obtain a uniform mixed liquid by magnetic stirring ;

[0038] (2) Pre-polymerization: Pour the uniform mixed liquid into a closed glass container, place the closed glass container in an aqueous solution at 40°C until the liquid in the closed glass container becomes a transparent block;

[0039] (3) Heat treatment: put the transparent block into a vacuum drying oven and keep it at 200°C for 0.5h to obtain a polymethacrylimide foam material.

[0040] The density of the polymethacrylimide foam material that present embodiment prepares is 210kg / m 3 , The tensile strength is 5.46MPa.

Embodiment 2

[0042] (1) Mixing: Mix 90g of acrylic acid, 90g of acrylamide, 3g of potassium persulfate, 2g of sodium thiosulfate, 10g of formamide, 7g of heptanol, 3g of tert-butanol, and 5g of magnesium acrylate, and obtain a uniform mixture by electric stirring liquid;

[0043] (2) Pre-polymerization: Pour the uniform mixed liquid into a closed glass container, place the closed glass container in an aqueous solution at 40°C until the liquid in the closed glass container becomes a transparent block;

[0044] (3) Heat treatment: Put the transparent block into a vacuum drying oven and keep it at 160°C for 6h; then raise the temperature of the vacuum drying oven to 250°C and keep it for 1h, then adjust the temperature of the vacuum drying oven to 160°C and keep it for 6h . A polymethacrylimide foam material was obtained.

[0045] The density of the polymethacrylimide foam material that present embodiment prepares is 81kg / m 3 , the tensile strength is 2.53MPa.

Embodiment 3

[0047](1) Mixing: mix 1g methacrylic acid, 10g acrylic acid, 30g methacrylamide, 20g acrylamide, 3g tert-butyl peroxypivalate, 1g formamide, 3g n-butanol, 6g zinc acrylate, pass Magnetic stirring to obtain a uniform mixed liquid;

[0048] (2) Pre-polymerization: Pour the uniform mixed liquid into a closed glass container, and place the closed glass container in an aqueous solution at 100° C. until the liquid in the closed glass container becomes a transparent block;

[0049] (3) Heat treatment: put the transparent block into a vacuum drying oven and keep it at 100° C. for 2 hours; then raise the temperature of the vacuum drying oven to 170° C. and keep it for 6 hours to obtain a polymethacrylimide foam material.

[0050] The density of the polymethacrylimide foam material that present embodiment prepares is 102kg / m 3 , The tensile strength is 3.26MPa.

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Abstract

The invention discloses a polymethacrylimide foam material and a preparation method thereof. The preparation method comprises the following steps: mixing a propylene monomer containing carboxyl, a propylene monomer containing acylamino, a polymerization initiating agent, a foaming agent and a cross-linking agent according to a proportion in parts by weight; electrically stirring or magnetically stirring to obtain uniform mixed liquid; pouring the mixed liquid into a sealed glass container to pre-polymerize so as to obtain a transparent block; and then hot processing to obtain the polymethacrylimide foam material. The propylene monomer containing the carboxyl and the propylene monomer containing the acylamino are used as main monomers to prepare the polymethacrylimide foam material by prepolymerization and hot processing without any virulent (methyl) acrylonitrile after being mixed. The invention has the advantages of simple and convenient working procedures and great production cost reduction. The prepared polymethacrylimide foam material can be directly widely applied to the fields of aerospace, carrier rockets, railway locomotives, ships, wind power generating blades, sports goods, and the like.

Description

technical field [0001] The invention relates to a preparation method of a foam material, in particular to a polymethacrylimide foam material and a preparation method thereof. Background technique [0002] Polymethacrylimide foam is currently the foam with the highest specific strength (strength / density) and specific modulus (modulus / density) in the world, and has excellent high temperature resistance and dimensional stability. It is an ideal core material for sandwich structures of high-quality and high-strength composite materials, and is widely used in aerospace, launch vehicles, railway locomotives, ships, wind power blades, sporting goods and other fields. In the 1960s, polymethacrylimide foam was commercialized. There are many raw materials for preparing polymethacrylimide foam materials, and a slight change in one of them will have a great impact on the properties of the final material. According to the difference of the main monomers for preparing polymethacrylimide...

Claims

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Application Information

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IPC IPC(8): C08F220/56C08F220/06C08F8/48C08J9/10C08J9/14
Inventor 唐红艳郭玉海陈建勇张华鹏冯新星陈龙
Owner ZHEJIANG SCI-TECH UNIV
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