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Polymethacrylimide foam plastic and preparation method thereof

A technology of acrylimide and foamed plastics, applied in the field of polymer materials, can solve the problems of many low-molecular residues, large difference in reactivity ratio, and large heat of polymerization, so as to reduce low-molecular residues and prevent explosive polymerization. , the effect of improving the degree of cross-linking

Inactive Publication Date: 2017-05-10
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

Although using acrylonitrile and methacrylic acid as the main monomers can produce low-cost foam products, due to the large difference in the reactivity ratio of acrylonitrile and methacrylic acid, the heat of polymerization is large, and implosion is easy to occur
In addition, it is easy to cause incomplete reaction and many low-molecular residues, so this type of foam has low performance in all aspects under high temperature conditions.

Method used

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  • Polymethacrylimide foam plastic and preparation method thereof
  • Polymethacrylimide foam plastic and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take by weight 150 parts of acrylonitrile, 20 parts of methacrylic acid, 0.8 part of acrylamide, 15 parts of phenylmaleimide, 0.04 part of azobisisoheptanonitrile, dibenzoyl peroxide, peroxide 0.6 part of mixture of lauryl oxide and peroxydicarbonate, 6 parts of allyl acrylate, 25 parts of N,N-dimethylformamide, 0.2 part of carboxamide, 1 part of polyethylene wax, diaryl alkyl phosphate 0.2 part of base ester. Add the above raw materials into the reaction kettle, mix them and pour them into a mold with a cavity inside, and pre-polymerize at 20°C to obtain a mixed solution; then put the mixed solution in a water bath at 30°C for 90 hours, and then bake it at 70°C Polymerize for 9 hours, cool and demould to obtain a copolymerized plate; heat the copolymerized plate at 80°C for 4 hours to obtain the primary product; Foaming for the first time for 1 hour and foaming for the second time for 1 hour, and then curing at 160°C for 2 hours to obtain poly(meth)acrylimide foam.

Embodiment 2

[0037] Weigh 30 parts by weight of acrylonitrile, 20 parts of methacrylic acid, 0.1 part of methacrylamide, 4 parts of methylmaleimide, 0.8 part of azobisisobutyronitrile, dibenzoyl peroxide , 0.04 parts of a mixture of lauryl peroxide and tert-butyl peroxybenzoate, 0.05 parts of 2-methallyl acrylate, 0.8 parts of a mixture of ethanol and propanol, 0.4 parts of formamide, and 0.3 parts of silicone compounds , 0.2 parts of conductive carbon black. Add the above raw materials into the reaction kettle, mix them and pour them into a mold with a cavity inside, and pre-polymerize at 50°C to obtain a mixed solution; then put the mixed solution in a water bath at 40°C for 40 hours, and then bake it at 90°C Polymerize for 7 hours, cool and demould to obtain a copolymerized plate; heat the copolymerized plate at 120°C for 2 hours to obtain the primary product; Carry out the first foaming for 0.2h and the second foaming for 0.2h, and then aging at 170°C for 0.2h to obtain poly(meth)acry...

Embodiment 3

[0039] Weigh 120 parts by weight of acrylonitrile, 150 parts of methacrylic acid, 6 parts of itaconic acid, 0.1 part of tribromophenylmaleimide, 4 parts of azobisisovaleronitrile, lauryl peroxide , 8 parts of a mixture of peroxydicarbonate and tert-butyl peroxybenzoate, 2 parts of allyl methacrylate, 3 parts of a mixture of formamide and isopropanol, butanol, 5 parts of methacrylamide, high 8 parts of polytetrafluoroethylene, 3 parts of calcium powder, 3 parts of dimethyl methylphosphonate, 5 parts of fatty acid surfactant, 0.1 part of water glass, and 0.01 part of benzoquinone. Add the above raw materials into the reaction kettle, mix them and pour them into a mold with a cavity inside, and pre-polymerize at 30°C to obtain a mixed solution; then put the mixed solution in a water bath at 35°C for 50 hours, and then bake it at 80°C Polymerize for 8 hours, cool and demould to obtain a copolymerized plate; heat the copolymerized plate at 100°C for 3 hours to obtain the primary pr...

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Abstract

The invention relates to polymethacrylimide foam plastic and a preparation method thereof and belongs to the field of macromolecular materials. The polymethacrylimide foam plastic is prepared by mixing materials, polymerizing and foaming; the materials include, by weight, 30-150 parts of acrylonitrile, 20-150 parts of methacrylic acid, 0.1-6 parts of third monomer, 0.1-5 parts of nitrogen-substituted maleimide, 0.04-4 parts of azo-initiator, 0.04-8 parts of peroxy-initiator, 0.05-6 parts of a crosslinking agent, 0.8-25 parts of a foaming agent, 0.2-5 parts of a nucleating agent, 0.3-8 parts of a release agent, and 0.2-6 parts of an aid. The polymethacrylimide foam plastic has low cost and high cost performance, and may meet the requirement on the application of composite core materials from different processes and with different properties; in addition, the invention also relates to the preparation method of the polymethacrylimide foam plastic; the preparation method is simple, easy to perform, and good in effect.

Description

technical field [0001] The invention relates to the field of polymer materials, and in particular to a poly(meth)acrylimide foam plastic and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam is a cross-linked rigid structural foam material with 100% closed-cell structure. Its reasonable molecular structure and uniform cell structure endow it with outstanding structural stability and Excellent mechanical properties, such as: high specific strength, high specific modulus, high closed cell ratio, high heat resistance, high reliability and excellent thermal compression creep resistance, is the structural foam material with the best comprehensive performance, At present, it has been widely used in aerospace, aviation, military industry, shipbuilding, automobile, railway locomotive manufacturing, radar, antenna and other fields. [0003] At present, this type of foam is mainly produced with methacrylonitrile (MAN) and methacrylic acid (MAA)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/46C08F220/06C08F220/56C08F222/40C08F222/02C08J9/14C08J9/10C08L33/20C08L33/02
CPCC08F220/06C08F220/46C08J9/104C08J9/142C08J2203/04C08J2203/12C08J2333/02C08J2333/20C08L2203/14C08L2201/02C08L2201/08C08F222/02C08F222/408C08F220/56C08F222/402C08F222/40C08F222/404
Inventor 郑乐马晓雄胡凡陈泽强吴先孟
Owner 湖南兆恒材料科技有限公司
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