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Preparation method of homogeneous polymethacrylimide (PMI) absorbing foam

A technology of polymethacrylimide and foam, which is applied in the field of functional foam materials, can solve problems such as easy settlement and difficult dispersion of wave absorbing agents, and achieve low cost, excellent wave absorbing performance, improved mechanical properties and thermal stability performance effect

Active Publication Date: 2018-03-30
CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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  • Abstract
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Problems solved by technology

[0006] The present invention mainly solves the technical problems existing in the above-mentioned prior art, and provides a method for preparing a homogeneous polymethacrylimide wave-absorbing foam, which solves the problems that the wave-absorbing agent is difficult to disperse and easily settles, and is easier to prepare High temperature resistant and broadband polymethacrylimide wave-absorbing foam

Method used

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  • Preparation method of homogeneous polymethacrylimide (PMI) absorbing foam

Examples

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Embodiment 1

[0011] Embodiment 1: 45 parts by weight of methacrylic acid, 53 parts by weight of methacrylonitrile, 0.3 parts by weight of initiator (azobisisobutyronitrile AIBN), 7 parts by weight of blowing agent (isopropanol), crosslinking agent (Magnesium oxide) 1 weight part, high-density wave-absorbing agent (FeNi) 15 weight parts, anti-settling agent (PA) 2 weight parts, nucleating agent (formamide) 0.5 weight part are raw materials and mix and stir to obtain uniform precursor body mixture. Then the precursor mixture was injected into the mold, and the mold was immersed in a water bath at 50° C. for a polymerization reaction for 80 hours to form a foam precursor copolymerization plate. Place the foam precursor copolymerization plate in an oven at 160°C to preheat for 2 hours, and then foam at a high temperature of 210°C for 2 hours to form a wave-absorbing PMI foam, and then crush the wave-absorbing PMI foam through a pulverizer. Obtain wave-absorbing PMI foam particles.

[0012] 5...

Embodiment 2

[0013] Embodiment 2: the same as the preparation method of Example 1, the difference is 48 parts by weight of methacrylic acid, 56 parts by weight of methacrylonitrile, 0.45 parts by weight of initiator (azobisisobutyronitrile AIBN), blowing agent (isobutyronitrile AIBN) propanol) 7.5 parts by weight, crosslinking agent (magnesia) 1.2 parts by weight, high-density wave absorbing agent (FeNi) 16 parts by weight, anti-settling agent (PA) 2.3 parts by weight, nucleating agent (formamide) 0.7 parts by weight , 7 parts by weight of light absorbing agent (nano superconducting graphite), 4.5 parts by weight of dispersant (sodium dodecylbenzenesulfonate), 2.2 parts by weight of defoaming agent (emulsified silicone oil). The properties of the prepared polymethacrylimide wave-absorbing foam are shown in Table 1.

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Abstract

The invention relates to a preparation method of homogeneous polymethacrylimide (PMI) absorbing foam, belonging to the technical field of functional foam materials. According to the preparation method, a wave absorbing agent is added by using a two-step method, a foam precursor copolymer plate is prepared by adding a large-density wave absorbing agent into precursor mixed liquid, and the foam precursor copolymer plate is foamed and then crushed so as to form wave-absorbing type PMI foam particles; the wave-absorbing type PMI foam particles, methacrylic acid or acrylic acid and methacrylonitrile or acrylonitrile are mixed together, and the light wave absorbing agent is added again, so that the uniform dispersion of the wave absorbing agent is realized in the PMI foam. A dispersing agent added into the PMI foam can realize high-speed dispersion in a mixture, thus preventing the sedimentation of various additives; therefore, not only are the excellent mechanical properties and thermal stability of the PMI absorbing foam improved, but excellent wave absorbing performance is also achieved. The homogeneous PMI absorbing foam can be applied to the fields such as space flight and aviationand military science.

Description

technical field [0001] The invention belongs to the technical field of functional foam materials, and in particular relates to a preparation method of homogeneous polymethacrylimide wave-absorbing foam. Background technique [0002] With the development of the electronic industry and the widespread use of electronic equipment, the pollution of electromagnetic waves is becoming more and more serious, and the demand for wave-absorbing materials and shielding materials is also increasing. The need for military equipment to be invisible and the demand for materials that can absorb radar waves are increasingly urgent. Therefore, no matter for military or civilian markets, the demand for wave-absorbing materials in practical applications is more urgent. [0003] In the research of wave-absorbing materials, wave-absorbing foam materials are one of the wave-absorbing materials that have received more attention. Wave-absorbing foam composite materials not only have a good absorption ...

Claims

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Application Information

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IPC IPC(8): C08F265/10C08F220/46C08F220/06C08F8/48C08F2/44C08K3/08C08K3/04C08J9/14
CPCC08F2/44C08F8/48C08F220/46C08F265/10C08J9/0066C08J9/142C08J2203/12C08J2351/00C08K3/04C08K3/08C08K2201/001C08K2201/011C08F220/06
Inventor 徐文生李克迪常艺孟佳丽
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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