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A kind of mesoporous polymethacrylimide foam and preparation method thereof

A polymethacrylimide and methacrylic acid technology is applied in the field of mesoporous polymethacrylimide foam and its preparation, and achieves the effects of low glue absorption, increased resin molecular weight, and increased polymerization efficiency

Active Publication Date: 2022-03-22
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

[0006] The present invention provides a kind of mesoporous polymethacrylimide foam and preparation method thereof, thus solves the aforementioned problems existing in the prior art

Method used

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  • A kind of mesoporous polymethacrylimide foam and preparation method thereof
  • A kind of mesoporous polymethacrylimide foam and preparation method thereof
  • A kind of mesoporous polymethacrylimide foam and preparation method thereof

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preparation example Construction

[0042] Such as figure 1 Shown, the preparation method of the mesoporous polymethacrylimide foam provided by the invention comprises the steps:

[0043] S1, according to parts by weight, using methacrylic acid and methacrylonitrile as monomers, adding initiator, crosslinking agent, foaming agent and other reagents, mixing evenly to obtain a mixed solution;

[0044] S2, pouring the mixed liquid into a mold, and performing free radical polymerization in a temperature environment of 30-50° C. to obtain a pre-polymerized resin plate;

[0045] S3, subjecting the pre-polymerized resin board to pre-treatment, demoulding, and post-treatment to obtain a foamable resin board; wherein, both the pre-treatment and post-treatment are carried out as follows: heating the pre-polymerized resin board to 50-70°C and keep for 4.5-5.5h, then raise the temperature to 75-90°C and keep for 4.5-5.5h, then raise the temperature to 95-125°C and keep for 1.5-2.5h;

[0046] S4, heating and foaming the fo...

Embodiment 1

[0078] The following raw materials are used in parts by weight: 20 parts of methacrylic acid, 50 parts of methacrylonitrile, 1.5 parts of acrylamide, 0.12 parts of initiator, 1 part of crosslinking agent, 8 parts of foaming agent, 2 parts of nucleating agent, 0.8 parts of molding agent, 1.2 parts of secondary auxiliary agent, wherein the initiator is a combination of dibenzoyl peroxide, lauryl peroxide, peroxydicarbonate, azobisisobutyronitrile, peroxygen initiator The mass ratio with the azo initiator is 7:1.5, the crosslinking agent is tert-butyl methacrylate and magnesium methacrylate, and the mass ratio of the two is 30:1, and the blowing agent is formamide, The combination of tert-butanol and isopropanol, the mass ratio of chemical foaming agent and physical foaming agent is 9:8, and the secondary auxiliary agent is a mixture of aliphatic ester surfactant and anisole peroxide;

[0079] Adopt following method to prepare mesoporous polymethacrylimide foam:

[0080] First, ...

Embodiment 2

[0086] The following raw materials are used in parts by weight: 30 parts of methacrylic acid, 10 parts of methacrylonitrile, 0.8 part of methacrylamide, 0.08 part of initiator, 0.5 part of crosslinking agent, 4 parts of foaming agent, and 1.2 parts of nucleating agent , 1.2 parts of release agent, 1.5 parts of secondary additives, wherein, the initiators are dibenzoyl peroxide, lauryl peroxide, peroxydicarbonate, tert-butyl peroxybenzoate and azodiiso The combination of nitrile, the mass ratio of peroxy initiator and azo initiator is 8:2, the crosslinking agent is 2-methallyl methacrylate and zinc methacrylate, and the mass ratio of the two The foaming agent is a combination of formamide, tert-butanol, and N-methylformamide. The mass ratio of chemical foaming agent to physical foaming agent is 8:8. The secondary additive is fatty acid surface A mixture of the active agent and chloranil;

[0087] Adopt following method to prepare mesoporous polymethacrylimide foam:

[0088]Fi...

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Abstract

The invention discloses a medium-pore polymethacrylimide foam and a preparation method thereof, and relates to the technical field of polymer materials. By using peroxide initiators and azo initiators to compound, gradient initiation, increase polymerization efficiency, increase resin molecular weight, reduce small molecule residues, use a mixed foaming agent of physical foaming agent and chemical foaming agent, and adjust the mixing The composition and ratio of the foaming agent, the composition and ratio of the crosslinking agent, control the foaming rate, the size and uniformity of the cells, and obtain more than 95% of the pore diameters of 60-400 μm, and uniform mesoporous polymers Methacrylimide foam products, the pore size foam products have low glue absorption and excellent comprehensive performance, and can be widely used in helicopter structural parts, UAV structural parts, wind turbine blades, radome, medical bed boards, sports equipment, maglev Composite material parts such as car body and audio equipment sound unit.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a medium-pore polymethacrylimide foam and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam has good mechanical properties, heat resistance, does not contain any Freon, is an environmentally friendly material, has high creep resistance, low dielectric constant and absorption It is an ideal core material for the preparation of sandwich composite materials, and has been widely used in many fields such as electronics, aerospace, high-speed locomotives, ships, radar antennas, sports medical equipment, etc. [0003] With the continuous development of technology in various application fields, the requirements for cell uniformity and comprehensive performance of polymethacrylimide materials are getting higher and higher. For example, PMI foam is used as a composite material prepared as a sandwich core. The diameter and uniformity of PMI...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/08C08J9/14C08L23/26C08L23/24C08F220/48C08F220/06C08F220/56C08F220/18C08F220/40C08F4/04C08F4/38
CPCC08J9/08C08J9/142C08F220/48C08F220/06C08F4/04C08F4/38C08J2203/02C08J2203/12C08J2333/26C08J2333/24C08J2203/204C08F220/54C08F220/40C08F220/56
Inventor 郑乐马晓雄王书平谢寄清
Owner 湖南兆恒材料科技有限公司
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