A method for preparing a reinforced polymethacrylimide foam composite material

A technology of polymethacrylimide and composite materials, which is applied in the field of preparation of polymethacrylimide foam composite materials, can solve the problem that the wave-absorbing material with foam structure cannot be prepared and the distribution uniformity of wave-absorbing particles is difficult to control , The absorption frequency band is not wide enough to achieve the effect of improving structural integrity and anti-deformation ability, realizing the integration of structure and function, and outstanding compressive performance

Active Publication Date: 2019-04-02
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

[0008] The wave-absorbing materials reported above are difficult to control the distribution uniformity of wave-absorbing particles, and the thickness and weight of the prepared materials are affected by the precision of the rolling process and the material. They all have the disadvantages of not having a wide enough absorption frequency band and poor mechanical strength, and cannot produce high-quality materials. foam structure absorbing material

Method used

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  • A method for preparing a reinforced polymethacrylimide foam composite material
  • A method for preparing a reinforced polymethacrylimide foam composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Put the honeycomb into the mold of the required shape first, and then put the mesh number of 8 to 30 mesh and the bulk density of 75±10kg / m 3 Polymethacrylimide pre-expanded particles filled to a density of 50±5 kg / m 3 In the regular hexagonal aramid honeycomb hole, the mold is sealed and foamed by in-mold foaming technology or molding. The specific foaming process is: preheat at 150°C for 1 hour, and then foam at 220°C for 2 hours , and finally cured at 180°C for 4 hours to obtain a reinforced polymethacrylimide foam composite material.

Embodiment 2

[0043] Firstly, 30wt% of superconducting carbon black (ECPEC600JD) as a wave absorbing agent, 0.3wt% of guanidine-based wetting agent and 10wt% of cetyltrimethylammonium bromide as a dispersing agent were passed through the alcohol solution at high speed. Disperse the functional filler in the solution by shearing to obtain a mixture solution; then the mesh number is 8-30 mesh and the bulk density is 75±10kg / m 3 The functional polymethacrylimide obtained by dispersing 45wt% of polymethacrylimide pre-expanded particles into the mixture 1 to obtain the mixture 2, drying the mixture 2 and mixing it with the binder epoxy resin 5wt% uniformly Pre-expanded particle mixture 3;

[0044] Put the honeycomb into the mold of the desired shape, fill the mixture 3 to a density of 50±5 kg / m 3 In the regular hexagonal aramid honeycomb 30wt% hole, the mold is sealed and treated by in-mold foaming technology. The specific foaming process is: preheating at 150°C for 1 hour, then foaming at 220°C...

Embodiment 3

[0048] First, 30wt% of the flame retardant calcium carbonate, 0.1wt% of the guanidinium-based sizing agent and 10wt% of the dispersant polyethylene wax are dispersed in the solution by high-speed shearing in the acetone solution to obtain a mixture solution. 1; then the mesh number is 8 to 30 mesh and the bulk density is 75±10kg / m 3 45wt% of polymethacrylimide pre-expanded particles are dispersed into mixture 1 to obtain mixture 2, and the functional polymethacrylic obtained by mixing uniformly with 5 wt% of binder acrylic coupling agent after drying mixture 2 Imide pre-expanded particle mixture 3;

[0049] Put the honeycomb into the mold of the desired shape, fill the mixture 3 to a density of 50±5 kg / m 3 In the regular hexagonal aramid honeycomb 30wt% hole, the mold is sealed and processed by in-mold foaming technology. The specific foaming process is: preheat at 150°C for 2 hours, then foam at 220°C for 3 hours, and finally After curing at 180°C for 1 hour, a reinforced p...

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Abstract

The invention relates to the field of novel material preparation and particularly relates to a method for preparing structure-function integrated foam. The objective of the invention is to provide a honeycomb reinforced polymethacrylimide foam composite material. The composite material includes polymethacrylimide prefoam particles, a functional filler, a guanidine-based impregnating agent, an adhesive and honeycomb. Through filling with particle fillers having different functions and honeycomb having different specifications and different materials, mechanical properties of the composite material are enhanced, and the composite material is endowed with electric conduction, wave absorption, flame retardance, shock absorption and other functions. Mechanical properties of foam can be enhanced, and the composite material is endowed with excellent temperature resistance, excellent mechanical properties, electric conduction, wave absorption, flame retardance, shock absorption and other functions.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for preparing a reinforced polymethacrylimide foam composite material. Background technique [0002] Polymethacrylimide foam (PMI) is a cross-linked, uniform pore size distribution foam with excellent structural stability and high mechanical strength. Polymethacrylimide foam has higher specific strength, specific modulus, heat resistance and heat and humidity resistance than other polymer foam materials, as well as better high temperature creep resistance and dimensional stability. 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 high-quality and high-strength composite sandwich structures. [0003] In addition, due to the high closed cell rate, uniform pore s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/00C08L77/10C08L63/00C08K3/04C08K3/26C08K3/22C08K3/34C08K9/04C08K9/02C08K3/38C08J9/00
CPCC08J9/00C08J9/0061C08J9/0066C08J9/0071C08J9/009C08J9/0095C08J2333/00C08K3/04C08K3/34C08K9/02C08K9/04C08K2003/2224C08K2003/265C08K2003/387C08K2201/011C08K3/041
Inventor 常艺董艳丽李克迪范晓庆徐文生李峰毛敏梁孟佳丽
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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