Acrylonitrile-based polymethacrylimide foam and preparation method therefor

A technology of acrylonitrile-based polymethacrylimide and foam, which is applied in the field of acrylonitrile-based polymethacrylimide foam and its preparation, and can solve problems such as low temperature resistance, large heat release, and reduced mechanical properties. problems, to achieve high heat resistance, excellent mechanical properties

Active Publication Date: 2015-12-02
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the use of the third monomer with low temperature resistance and urea-alcohol mixed foaming agent, the foam contains a non-imide structure, which has low temperature resistance and low heat distortion temperature; the macroporous foam is relatively small compared to the same density Cellular foam mechanical properties will also decrease
[0007] In the methods disclosed in these patents, due to the reasons of formula and preparation process, the heat release during prepolymerization is large, and it is very easy to detonate; High, lower mechanical properties

Method used

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  • Acrylonitrile-based polymethacrylimide foam and preparation method therefor
  • Acrylonitrile-based polymethacrylimide foam and preparation method therefor
  • Acrylonitrile-based polymethacrylimide foam and preparation method therefor

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preparation example Construction

[0049] Such as figure 1 Shown is the process flow diagram for the preparation of the acrylonitrile-based PMI foam of the present invention, and the preparation method of the acrylonitrile-based polymethacrylimide foam of the present invention comprises the following steps:

[0050] (1), mix methacrylic acid MAA, acrylonitrile AN, initiator, foaming agent, nucleating agent, crosslinking agent and heat-resistant additive uniformly, obtain reaction solution;

[0051] (2), the annular strip that elastic material is prepared is fixed on a flat plate, and annular strip surrounds the annular frame of required shape on flat plate, and the reaction solution that step (1) is obtained is poured in described annular frame, and Another flat plate is added to the ring frame, and the reaction device is clamped by clamps to obtain the reaction device;

[0052] Wherein the elastic material can be rubber, the flat plate can be a glass plate; the annular strip is a rectangular strip, the thickn...

Embodiment 1

[0062] Acrylonitrile-based polymethacrylimide foam obtained by mixing and reacting the following components:

[0063] Monomer: methacrylic acid (MAA), the number of parts by mass is 35;

[0064] Monomer: acrylonitrile (AN), the number of parts by mass is 65;

[0065] Initiator: azobisisobutyronitrile AIBN, its mass fraction is 0.05; azobisisovaleronitrile AIBN, its mass fraction is 0.05; dibenzoyl peroxide, its mass fraction is 1.5;

[0066] Foaming agent: dimethylurea, its mass fraction is 7.5; Methylurea, its mass fraction is 1.5;

[0067] Nucleating agent: magnesium oxide, its mass fraction is 2; Calcium oxide, its mass fraction is 2;

[0068] Crosslinking agent: triallyl cyanurate, its mass fraction is 0.1; acrylamide, its mass fraction is 3.0.

[0069] Heat-resistant additive: silicon dioxide, the number of parts by mass is 5.

[0070] The preparation method of above-mentioned horse acrylonitrile-based polymethacrylimide foam, it adopts following steps to carry out su...

Embodiment 2

[0077] Acrylonitrile-based polymethacrylimide foam obtained by mixing and reacting the following components:

[0078] Monomer: methacrylic acid (MAA), its mass fraction is 45;

[0079] Monomer: acrylonitrile (AN), its mass fraction is 55;

[0080] Initiator: azobisisovaleronitrile, whose mass fraction is 0.04; azobisisoheptanonitrile, whose mass fraction is 0.04; tert-butyl peroxybenzoate, whose mass fraction is 2;

[0081] Foaming agent: urea, its mass fraction is 5.0;

[0082] Nucleating agent: calcium oxide, its weight ratio is 5;

[0083] Crosslinking agent: methacrylamide, its weight ratio is 4.0;

[0084] Heat-resistant additive: DMMP, its weight ratio is 8.0.

[0085] The preparation method of above-mentioned acrylonitrile base polymethacrylimide foam, it adopts following steps to carry out successively:

[0086](1), monomer methacrylic acid, acrylonitrile, initiator, blowing agent, nucleating agent are weighed according to metering, mix uniformly, form reaction so...

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Abstract

The invention relates to acrylonitrile-based polymethacrylimide foam which comprises the following components in parts by mass: 35-60 parts of methacrylic acid MAA, 40-65 parts of acrylonitrile AN, 0.10-4.0 parts of an initiator, 1.0-20 parts of a foaming agent, 1-5 parts of a nucleating agent, 0.1-5 parts of a crosslinking agent and 5-10 parts of a heat resisting additive, wherein the initiator is an azo compound or a mixture of the azo compound and a peroxide and the initiator at least comprises three different compounds at the same time; the azo compound is azobisisobutyronitrile AIBN, azobisisoamylonitrile or 2,2'-azobisisoheptonitrile; the peroxide is dibenzoyl peroxide, lauroyl peroxide, tert-butyl peroxyoctoate or tert-butyl peroxybenzoate. The acrylonitrile-based polymethacrylimide foam provided by the invention is good in heat resistance, high in heat deformation temperature which is greater than 220 DEG C and excellent in mechanical property.

Description

technical field [0001] The invention relates to a high-performance copolymer foam, in particular to an acrylonitrile-based polymethacrylimide foam and a preparation method thereof. Background technique [0002] In the structural design of resin matrix composites, sandwich structural composites are a typical light-weight, high-strength, high-modulus structural material, which combines the high strength and The organic combination of high modulus and low density of the sandwich forms a lightweight, high-strength and high-rigidity structural composite material, which has extremely important applications in industries such as aircraft, rockets, radar, shipbuilding, transportation, and medical equipment. [0003] Polymethacrylimide (PMI) foam is mainly used as the core material of composite sandwich structure, which has the following properties: (1) 100% closed-cell structure, and isotropic; (2) good heat resistance, heat The deformation temperature is 180-240°C; (3) Excellent m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/46C08F220/56C08F226/02C08F220/18C08F8/48C08F4/04C08F4/38C08J9/10C08J9/04C08K3/22C08K3/36C08K5/3415C08K5/5333
Inventor 赵飞明凌铭博王昕
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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