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A kind of macroporous polymethacrylimide foam and preparation method thereof

A technology of polymethacrylimide and foam, which is applied in the field of large-pore polymethacrylimide foam and its preparation, to achieve the effects of good overall mechanical properties, large amount of glue absorption, and firm adhesion

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 macroporous polymethacrylimide foam and preparation method thereof, thus solve the aforementioned problems existing in the prior art

Method used

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

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preparation example Construction

[0074] (2) The preparation method provided in the present invention is described in detail as follows:

[0075] The material mixing process is divided into two steps:

[0076] Step S1: Accurately weigh the amount of the organic solvent, molecular weight modifier, dispersion performance modifier, and cell performance modifier in the viscosity-adjusting compound, and mix them uniformly within the range of 20-32°C, and observe that there is no precipitation, separation layers etc.

[0077] Step S2, accurately weigh the components such as (meth)acrylic acid, (meth)acrylonitrile, initiator, foaming agent, viscosity adjusting compound, moisture absorbent, third monomer and secondary additives , Mix well and dissolve completely at a constant temperature of 15-35°C. If there is precipitation or insoluble matter, it is necessary to filter the precipitate or insoluble matter.

[0078] The mixed material liquid obtained after mixing the materials uniformly undergoes a polymerization re...

Embodiment 1

[0083] According to parts by weight: 60 parts of methacrylic acid, 60 parts of methacrylonitrile, 1.5 parts of propyl methacrylate, 0.8 parts of initiator, 5 parts of foaming agent, 5 parts of viscosity adjusting compounding agent, 3 parts of water absorption agent, 0.06 parts of antioxidant 1076, mixed evenly, and filtered to obtain a mixed material liquid; wherein, the viscosity adjusting compound was previously composed of isooctyl mercaptopropionate, N-phenylmaleimide, methacrylic acid hydroxyl Propyl ester and ethanol are mixed, and the weight ratio of the four substances is 5:2:3:5; the initiator is mixed with lauryl peroxide and tert-butyl peroxybenzoate, and the weight ratio of the two It is 3:5; the foaming agent is a mixture of propanol and butanol, and the weight ratio of the two is 2:3; the moisture absorbent is molecular sieve.

[0084] After reacting the mixture solution in a water bath at 31°C for 350h, heat treatment at 50°C for 100h to obtain a prepolymer;

...

Embodiment 2

[0088] According to parts by weight: 70 parts of methacrylic acid, 70 parts of methacrylonitrile, 1.5 parts of acrylamide, 0.9 parts of initiator, 4 parts of foaming agent, 4 parts of viscosity adjusting compounding agent, 2 parts of moisture absorbent, 0.03 Dodecyl benzene sulfonate, mixed evenly, and filtered to obtain a mixed material liquid; wherein, the viscosity adjusting compound was previously composed of dodecyl mercaptan, triallyl isocyanurate, hydroxyethyl acrylate It is made by mixing ester and propanol, and its weight ratio is 5:2:5:6; the initiator is made by mixing dicumyl peroxide and peroxydicarbonate, and the weight ratio of the two is 2:3 ; The foaming agent is formed by mixing ethanol and butanol, and the weight ratio of the two is 1:1; the moisture absorbing agent is activated carbon.

[0089] After the mixture solution was reacted in a water bath at 33°C for 280h, it was heat-treated at 90°C for 90h to obtain a prepolymer;

[0090] The temperature of the...

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Abstract

The invention discloses a large-pore polymethacrylimide foam and a preparation method thereof, and relates to the technical field of polymer materials. By adding a viscosity-adjusting compounding agent and a moisture absorption agent to a mixture of (meth)acrylic acid, (meth)acrylonitrile, a third monomer, an initiator, a foaming agent, etc., the viscosity-adjusting compounding agent includes an organic solvent , Molecular weight regulator, dispersion performance regulator and cell performance regulator to control the viscosity and uniformity of the reaction solution. The prepared PMI foam has a pore diameter of 0.3-10mm and is relatively thick. When it is combined with fibers, Large amount of glue absorption, strong adhesion, and good overall mechanical properties can better ensure the adhesion of PMI foam to the skin, and it is difficult to crack and fall off, which better meets the application requirements of PMI foam in the composite material industry .

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polymethacrylimide foam with large pores and a preparation method thereof. Background technique [0002] Polymethacrylimide foam (referred to as "PMI foam") is a lightweight, closed-cell rigid foam. With good mechanical properties, thermal deformation temperature and chemical stability, it is an ideal core material for high-performance sandwich structure composites. [0003] At present, polymethacrylimide foam mostly adopts the following preparation method: using (meth)acrylic acid, (meth)acrylonitrile, the third comonomer, initiator, foaming agent, nucleating agent, etc. as raw materials Polymerizes into a resin; the resin is further foamed to form PMI foam. The PMI foam prepared by this method generally has a pore size below 300 μm. Due to the small foam pore size and low glue absorption, in industries such as buoys and sound boxes, PMI foam with small cells (pore...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/50C08F220/44C08F220/56C08F220/14C08J9/14
CPCC08F220/06C08F220/50C08F220/44C08F2/38C08J9/142C08J2203/12C08J2203/182C08J2333/02C08J2333/22C08J2333/20C08F220/56C08F220/14
Inventor 谢俊杰唐德旺谢寄清王书平
Owner 湖南兆恒材料科技有限公司
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