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Flame-retardant polymethacrylimide foam with high cost performance and preparation method thereof

A technology of polymethacrylimide and methacrylic acid, which is applied in the field of polymer material preparation, can solve the problems that the flame retardancy of foam cannot meet the actual needs, so as to improve the mechanical properties and heat resistance, maintain uniformity, The effect of reducing the cost of raw materials

Active Publication Date: 2021-12-24
湖南兆恒材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a high cost-effective flame-retardant polymethacrylimide foam and its preparation method to solve the deficiencies of the prior art, thereby solving the technology that the flame-retardant performance of PMI foam in the prior art cannot meet actual needs question

Method used

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  • Flame-retardant polymethacrylimide foam with high cost performance and preparation method thereof
  • Flame-retardant polymethacrylimide foam with high cost performance and preparation method thereof
  • Flame-retardant polymethacrylimide foam with high cost performance and preparation method thereof

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preparation example Construction

[0103] The preparation method of the above-mentioned cost-effective flame-retardant polymethacrylimide foam comprises the following steps:

[0104] S1. Mixing of raw materials: According to parts by weight, using methacrylic acid, methacrylonitrile and acrylonitrile as monomers, adding flame retardant, heat stabilizer, heat resistant agent, initiator, crosslinking agent, foaming agent and Mix other reagents evenly to obtain a mixed solution;

[0105] S2. Pre-polymerization: pour the mixed liquid into the mold, and carry out free radical polymerization in a temperature environment of 30-50°C to obtain a pre-polymerized resin plate;

[0106] S3. Polymerization: the pre-polymerized resin board is subjected to pre-treatment, demoulding, and post-treatment to obtain a foamable resin board; wherein, the pre-treatment and post-treatment are carried out as follows: heat the pre-polymerized resin board to 50-70°C And keep it for 4~8h, then raise the temperature to 75~95℃ and keep it f...

Embodiment 1

[0112] The following components are used in parts by weight: 50 parts of methacrylic acid, 10 parts of methacrylonitrile, 30 parts of acrylonitrile, 1.2 parts of acrylamide, 0.08 parts of initiator, 4.5 parts of crosslinking agent, 4 parts of foaming agent, 0.3 part of heat agent, 15 parts of main flame retardant, 3 parts of auxiliary flame retardant, 0.5 part of heat stabilizer, 0.8 part of secondary auxiliary agent, wherein, initiator is dibenzoyl peroxide, lauryl peroxide, The combination of peroxydicarbonate and tert-butyl peroxybenzoate, the mass ratio of the four is 2:1.2:2.5:2.2, the crosslinking agent is tert-butyl methacrylate and zinc methacrylate, the mass ratio of both The ratio is 6:1, the foaming agent is a combination of formamide, tert-butanol, and isopropanol, the mass ratio of the three is 7:3:2, and the main flame retardant is [(6-oxygen-6H-diphenyl And (c,e)(1,2)-oxaphosphorin-6-one)-methyl]-succinic acid, the auxiliary flame retardant is trixylyl phosphate...

Embodiment 2

[0120]The following components are used in parts by weight: 70 parts of methacrylic acid, 15 parts of methacrylonitrile, 35 parts of acrylonitrile, 2.5 parts of methacrylamide, 0.25 parts of initiator, 2.5 parts of crosslinking agent, and 5 parts of foaming agent , 8 parts of heat resistant agent, 22 parts of main flame retardant, 6 parts of auxiliary flame retardant, 1.5 parts of heat stabilizer, 2.5 parts of secondary auxiliary agent, among which, the initiators are dibenzoyl peroxide and lauryl peroxide , a combination of peroxydicarbonate and tert-butyl peroxybenzoate, the mass ratio of the four is 2:2.5:3.2:1.5, and the crosslinking agent is allyl methacrylate and zinc methacrylate, both The mass ratio is 1.5:1, the blowing agent is a combination of formamide, isobutanol and propanol, the mass ratio of the three is 9:7:1, and the main flame retardant is 2-[10-(9,10- Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide-10-yl)]-maleic acid, the auxiliary flame retardant is bisphen...

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Abstract

The invention discloses flame-retardant polymethacrylimide foam and a preparation method of the flame-retardant polymethacrylimide foam. The foam is prepared from the following raw materials in parts by weight: 40 to 160 parts of methacrylic acid; 0 to 80 parts of methacrylonitrile; 10 to 200 parts of acrylonitrile; 0.1 to 6 parts of a third monomer; 0.04 to 5 parts of an initiator; 0.5 to 8 parts of a cross-linking agent; 0.5 to 15 parts of a foaming agent; 0.25 to 10 parts of a heat resistant agent; 0.25 to 5 parts of a heat stabilizer; and 15 to 25 parts of a flame retardant. The PMI foam with high performance and low cost can be prepared by adopting methacrylic acid, methacrylonitrile and acrylonitrile as main monomers, and then the PMI foam has good flame retardance and excellent comprehensive performance by adding the oxaphosphaphenanthrene ring flame retardant containing dicarboxyl and an auxiliary flame retardant. In addition, the added heat-resistant agent and heat stabilizer further ensure the high-temperature heat resistance and mechanical properties of the material. Therefore, the polymethacrylimide foam prepared by the invention has good flame retardance, machinability and mechanical properties, good high-temperature size and weight stability, flame retardancy during ignition, and low smoke and low toxicity in the combustion process.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and in particular relates to a cost-effective flame-retardant polymethacrylimide foam and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam has a large number of carboxyl and nitrile groups in the side chain, which reacts at high temperature to form an imide ring, so it has excellent mechanical properties and heat resistance, and is good with other materials. Resin compatibility, easy machining and heating process to co-cure to form a composite sandwich structure, is an ideal core material for high-performance sandwich structure composite materials, and is widely used in aerospace, rail transit, medical bed boards, lightweight vehicles and other fields , The market application value is extremely high. With the expansion of market applications, the performance requirements for PMI are getting higher and higher. In addition to excellent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/46C08F220/56C08F220/18C08F220/40C08K5/523C08K5/5313C08K5/3415C08J9/10
CPCC08F220/06C08K5/523C08K5/5313C08K5/3415C08J9/10C08J9/0038C08J9/0028C08J2203/04C08F220/46C08F220/56C08F220/1804C08F220/40
Inventor 郑乐谢寄清陈泽强曹阳王叔平
Owner 湖南兆恒材料科技有限公司
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