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A kind of small-pore polymethacrylimide foam and preparation method thereof

A technology of polymethacrylimide and methacrylic acid, applied in the field of small-pore polymethacrylimide foam and its preparation, to achieve high-temperature dimensional and weight stability, good machinability, and glue absorption low effect

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

[0007] The object of the present invention is to provide a kind of polymethacrylimide foam of small aperture and preparation method thereof, thus solve the aforementioned problems existing in the prior art

Method used

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  • A kind of small-pore polymethacrylimide foam and preparation method thereof
  • A kind of small-pore polymethacrylimide foam and preparation method thereof
  • A kind of small-pore polymethacrylimide foam and preparation method thereof

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preparation example Construction

[0046] Such as figure 1 Shown, the preparation method of the small-pore polymethacrylimide foam provided by the invention comprises the steps:

[0047] Step 1, using methacrylic acid and methacrylonitrile as monomers in parts by weight, adding an initiator, a crosslinking agent, a foaming agent and other reagents, and mixing uniformly to obtain a mixed solution;

[0048] Step 2, pouring the mixed solution into a mold, and performing free radical polymerization in a temperature environment of 30°C to 50°C to obtain a pre-polymerized resin plate;

[0049] Step 3, subjecting the pre-polymerized resin board 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: the pre-polymerized resin board is heated to 50-80°C and keep for 4-6h, then raise the temperature to 85-100°C and keep for 5-7h, then raise the temperature to 105-115°C and keep for 1.5-3.5h;

[0050] Step 4, heating and...

Embodiment 1

[0082] The following components are used in parts by weight: 20 parts of methacrylic acid, 50 parts of methacrylonitrile, 2 parts of acrylamide, 0.12 parts of initiator, 3 parts of crosslinking agent, 4.5 parts of foaming agent, 2 parts of nucleating agent, 0.8 parts of mold release agent, 1.2 parts of secondary auxiliary agent, wherein, initiator is the combination of dibenzoyl peroxide, lauryl peroxide, dicarbonate peroxide and tert-butyl peroxybenzoate, the four The mass ratio is 2:2:3.5:2.5, the crosslinking agent is tert-butyl methacrylate and magnesium methacrylate, and the mass ratio of the two is 40:1, and the blowing agent is formamide, tert-butyl alcohol , the combination of isopropanol, the mass ratio of the three is 9:6:1, and the secondary auxiliary agent is the mixture of aliphatic ester surfactant and anisole peroxide;

[0083] Adopt the following method to prepare small-pore polymethacrylimide foam:

[0084] First, mix the above components evenly according to ...

Embodiment 2

[0090] The following components are used in parts by weight: 120 parts of methacrylic acid, 80 parts of methacrylonitrile, 4 parts of N,N-dimethylacrylamide, 0.5 parts of initiator, 6 parts of crosslinking agent, and 12.5 parts of foaming agent , 5 parts of nucleating agent, 2 parts of release agent, 1.5 parts of secondary auxiliary agent, wherein, the initiator is dibenzoyl peroxide, lauryl peroxide, dicarbonate peroxide and tert-butyl peroxybenzoate The combination of esters, the mass ratio of the four is 2.5:2.5:4:1.5, the crosslinking agent is allyl acrylate and zinc methacrylate, and the mass ratio of the two is 15:1, and the foaming agent is formazan The combination of amide, tert-butanol and ethanol, the mass ratio of the three is 8:5:2, and the secondary auxiliary agent is a mixture of metal soap surfactant and benzoquinone;

[0091] Adopt the following method to prepare small-pore polymethacrylimide foam:

[0092] First, mix the above components evenly according to t...

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Abstract

The invention discloses a small-pore polymethacrylimide foam and a preparation method thereof, and relates to the technical field of polymer materials. It controls the foaming rate, cell size and Uniformity, more than 95% of the pore diameters are in the range of 10-60μm, and the pore diameter is uniform, and the maximum pore diameter does not exceed 120μm. The small-pore foam product has low glue absorption and is combined with the skin. Strong force, good machinability, good mechanical properties, high temperature dimensional and weight stability, and excellent performance, which solves the problem that the pore size and uniformity of polymethacrylimide foam products prepared in the prior art cannot be controlled. Insufficient high-temperature stability cannot meet the industry needs of small-pore polymethacrylimide foam products.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a small-pore polymethacrylimide foam and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam is a lightweight, closed-cell rigid foam with excellent mechanical properties and heat resistance, good compatibility with other resins, and easy to machine The processing and heating process co-cure to form a composite sandwich structure, which is an ideal core material for high-performance sandwich structure composites. [0003] At present, the research on polymethacrylimide foam is mainly to change its properties, such as mechanical properties, heat resistance, heat distortion temperature, etc., by changing the formula and preparation method. [0004] However, there is no research on the cell state of polymethacrylimide foam, and in the actual application of PMI foam plastics in some industries, there are often strict requirements on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/10C08J9/14C08L33/24C08L33/26C08F220/48C08F220/06C08F220/56C08F220/18C08F220/54C08F220/40
CPCC08J9/104C08J9/142C08F220/06C08F220/48C08J2203/04C08J2203/12C08J2203/184C08J2333/24C08J2333/26C08F220/56C08F220/40
Inventor 郑乐马晓雄王书平谢俊杰
Owner 湖南兆恒材料科技有限公司
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