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Wave-absorbing type polymethacrylimide foam/chopped fiber composite material and preparation method thereof

A polymethacrylic imine, methacrylic acid technology is applied in the field of wave absorbing functional materials, which can solve the problems of unguaranteed performance stability and inability to achieve uniform dispersion, and achieves low cost, excellent wave absorbing performance, and preparation method. simple effect

Active Publication Date: 2014-12-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there are reports that carbon fibers are added to traditional foam materials such as polyurethane, epoxy resin, and phenolic resin to make composite materials. Traditional foam materials mainly adopt liquid foaming method, and chopped fibers absorb waves. The material can be better dispersed and anti-sedimentation, but for the polymethacrylimide foam material, the solid foaming method is used, and incompatible chopped fibers cannot be directly added, and the chopped fibers are added to polymethacryl After the imine foam material cannot be uniformly dispersed, there is no guarantee for the stability of the performance. At present, the existing technology cannot overcome this technical problem, and a wave-absorbing polymethacrylic acid imide foam material has been prepared.

Method used

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  • Wave-absorbing type polymethacrylimide foam/chopped fiber composite material and preparation method thereof
  • Wave-absorbing type polymethacrylimide foam/chopped fiber composite material and preparation method thereof
  • Wave-absorbing type polymethacrylimide foam/chopped fiber composite material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] First prepare raw materials according to the following quality: 42 parts of methacrylic acid, 58 parts of methacrylonitrile, 0.25 parts of azobisisobutyronitrile, 3 parts of formamide, 2 parts of acrylamide, 1 part of carbonamide, and 0.5 parts of methyl silicone oil share. The above reagents were mixed and stirred thoroughly to obtain solution A.

[0036] Add 4 parts of polymethyl methacrylate with a molecular weight of 1.5 million to solution A, and dissolve the thickener by stirring at a high speed at a temperature of 50°C to obtain viscous solution B.

[0037] Add 1 part of polyacrylonitrile-based carbon fiber with a length of 2 mm into solution B, and uniformly disperse polyacrylonitrile-based carbon fiber in solution B by low-speed vibration and power ultrasound to obtain solution C in which chopped fibers are dispersed.

[0038] The solution C was injected into a sealed glass plate mold of 100mm×100mm×10mm, and reacted at a temperature of 50°C for 72h to obtain ...

Embodiment 2

[0046] First prepare the raw materials according to the following mass percentages: 50 parts of methacrylic acid, 50 parts of methacrylonitrile, 0.4 parts of azobisisobutyronitrile, 8 parts of formamide, 2 parts of acrylamide, 1 part of carbonamide, and 0.5 parts of methyl silicone oil share. The above reagents were mixed and stirred thoroughly to obtain solution A.

[0047] Add 6 parts of polymethyl methacrylate with a molecular weight of 1.5 million to solution A, and dissolve the thickener by high-speed stirring at a temperature of 40°C to obtain viscous solution B.

[0048]Add 0.5 parts of aramid fibers with a length of 4mm into solution B, and disperse the aramid fibers evenly in solution B by low-speed vibration and power ultrasound to obtain solution C in which chopped fibers are dispersed.

[0049] The solution C was injected into a sealed glass plate mold of 100mm×100mm×10mm, and reacted at a temperature of 60°C for 48h to obtain a polymethacrylic acid imide copolyme...

Embodiment 3

[0053] Prepare raw materials according to the following mass percentages: 58 parts of methacrylic acid, 42 parts of methacrylonitrile, 0.5 parts of diacetyl peroxide, 6 parts of formamide, 2.5 parts of acrylamide, 1.5 parts of carbonamide, and 0.5 parts of methyl silicone oil. The above reagents were mixed and stirred thoroughly to obtain solution A.

[0054] Take 8 parts of polymethyl methacrylate with a molecular weight of 1.5 million and add it to solution A, and dissolve the thickener by stirring at a high speed at a temperature of 50°C to obtain viscous solution B.

[0055] Add 0.3 parts of carbon fibers with a length of 10 mm into solution B, and disperse the carbon fibers in solution B evenly through low-speed vibration and power ultrasonic to obtain solution C in which chopped fibers are dispersed.

[0056] The solution C was injected into a sealed glass plate mold of 100mm×100mm×10mm, and reacted at a temperature of 50°C for 72h to obtain a polymethacrylic imide copol...

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Abstract

The invention discloses a wave-absorbing type polymethacrylimide foam / chopped fiber composite material and a preparation method thereof. The composite material is formed by uniformly dispersing a chopped fiber wave-absorbing agent in a methacrylic acid / methacrylonitrile copolymer substrate. The composite material is simple in preparation method and low in cost, and the comprehensive mechanical property of the composite material is obviously improved in comparison with that of a polymethacrylimide foam material in the prior art. In addition, the composite material has a certain wave-absorbing effect. Thus, an application range of the polymethacrylimide foam material is enlarged.

Description

technical field [0001] The invention relates to a wave-absorbing polymethacrylic imide foam / chopped fiber composite material and a preparation method thereof, belonging to the field of wave-absorbing functional materials. Background technique [0002] Polymethacrylic imide foam is a new type of foam material, which was first developed by the German Rohm company in 1962 and gradually realized industrialization. The development of many technical fields such as aviation, ships, high-speed trains, and wind power generation. With the development of composite materials, polymethacrylimide foam has also begun to develop into doped composite materials. The dopant is mainly to improve the mechanical properties and temperature resistance of polymethacrylimide, or to obtain Get functional composites. In the prior art, there are reports that carbon fibers are added to traditional foam materials such as polyurethane, epoxy resin, and phenolic resin to make composite materials. Traditio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/00C08L23/06C08K7/06C08K3/04C08K7/14C08K3/22C08K7/10C08K7/08C08K3/34C08K3/38C08J9/04C08F265/04C08F220/06C08F220/50C08F220/56C08F2/44
Inventor 陈辉杜作娟黄小忠惠忆聪
Owner CENT SOUTH UNIV
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