Micropore polymethacrylimide foam with high thermal deformation temperature and preparing method thereof

A technology of polymethacrylimide and deformation temperature, which is applied in the field of small-hole polymethacrylimide foam with high heat distortion temperature and its preparation, and can solve the problems of low foam temperature resistance and low heat distortion temperature , to achieve high heat resistance and excellent mechanical properties

Active Publication Date: 2015-11-11
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

The temperature resistance of the foam disclosed in this patent is not high, and the heat distortion temperature is low

Method used

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  • Micropore polymethacrylimide foam with high thermal deformation temperature and preparing method thereof
  • Micropore polymethacrylimide foam with high thermal deformation temperature and preparing method thereof
  • Micropore polymethacrylimide foam with high thermal deformation temperature and preparing method thereof

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preparation example Construction

[0046] Such as figure 1 Shown is the preparation process flow chart of the small-pore polymethacrylimide foam of the present invention, the preparation method of the high heat distortion temperature small-hole polymethacrylimide foam of the present invention, comprising the following steps:

[0047] (1), mix methacrylic acid MAA, acrylonitrile AN, initiator, foaming agent, nucleating agent, crosslinking agent and heat-resistant additive uniformly, obtain reaction solution;

[0048] (2), the annular bar that elastic material is prepared is fixed on a flat plate, and annular bar surrounds the annular frame of required shape along the inner side of plate edge, the reaction solution that step (1) is obtained is poured in described annular frame, and Cover another flat plate on the ring frame, and obtain the reaction device after being clamped by a clamp;

[0049] The elastic material is rubber, specifically PVC strips, EPDM strips or silicone rubber strips; the flat plate is a gl...

Embodiment 1

[0059] High heat distortion temperature small cell polymethacrylimide foam, which is obtained by mixing and reacting the following components:

[0060] Monomer: methacrylic acid (MAA), the number of parts by mass is 35;

[0061] Monomer: methacrylonitrile (MAN), the number of parts by mass is 65;

[0062] Initiator: azo-bis(4-cyanovaleric acid), the number of parts by mass is 3;

[0063] Foaming agent: methyl urea, the number of parts by mass is 5;

[0064] Nucleating agent: magnesium oxide, the mass fraction is 1;

[0065] Crosslinking agent: triallyl cyanurate, the number of parts by mass is 2;

[0066] Heat-resistant additive: DMMP, 5 parts by mass.

[0067] The preparation method of above-mentioned polymethacrylimide foam, it adopts following steps to carry out successively:

[0068] (1) The monomer methacrylic acid and methacrylonitrile, initiator, foaming agent, nucleating agent, crosslinking agent, heat-resistant additive are weighed according to metering, and unif...

Embodiment 2

[0075] High heat distortion temperature small cell polymethacrylimide foam, which is obtained by mixing and reacting the following components:

[0076] Monomer: methacrylic acid (MAA), the number of parts by mass is 45;

[0077] Monomer: methacrylonitrile (MAN), the number of parts by mass is 55;

[0078] Initiator: azo-bis(4-cyanovaleric acid), 1.5 parts by mass; azobisisobutyronitrile, 0.1 parts by mass;

[0079] Foaming agent: urea, the number of parts by mass is 8;

[0080] Nucleating agent: calcium oxide, the number of parts by mass is 4;

[0081] Crosslinking agent: allyl methacrylate, the number of parts by mass is 0.5;

[0082] Heat-resistant additive: tribromophenylmaleimide, 10 parts by mass.

[0083] The preparation method of above-mentioned polymethacrylimide foam, it adopts following steps to carry out successively:

[0084] (1) The monomer methacrylic acid and methacrylonitrile, initiator, foaming agent, nucleating agent, crosslinking agent, heat-resistant a...

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Abstract

The invention relates to micropore polymethacrylimide foam with high thermal deformation temperature. The foam comprises, by mass, 35-60 parts of methacrylic acid (MAA), 65-40 parts of acrylonitrile, 0.10-4.0 parts of initiators, 1.0-20 parts of foaming agents, 1-5 parts of nucleating agents, 0.1-5 parts of cross-linking agents and 5-10 parts of heat-resisting additives; the initiators are azo-bis(4-cyano valeric acid) or mixtures of azo-bis(4-cyano valeric acid) and other azo compounds. The other azo compounds are azodiisobutyronitrile AIBN, azobisisovaleronitrile or azobisisoheptonitrile. According to the micropore polymethacrylimide foam high in thermal deformation temperature, the foam has the small pore diameter phi of 0.1-0.3 mm, thermal resistance is high, the thermal deformation temperature is high and is larger than 200 DEG C, and the mechanical property is excellent.

Description

technical field [0001] The invention relates to a high-performance copolymer foam, in particular to a small-hole polymethacrylimide foam with a high heat distortion temperature 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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/46C08F220/06C08F226/06C08F220/40C08F220/56C08J9/10
Inventor 赵飞明陈江涛赵云峰
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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