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Preparation method of novel polymethacrylimide foam

A technology of polymethacrylimide and methacrylic acid, which is applied in the field of preparation of new polymethacrylimide foam, can solve the problems of thermal acceleration of polymerization reaction, reaction heat cannot be released in time, and implosion polymerization

Inactive Publication Date: 2016-03-16
宁夏致微材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the thickness of the polymer plate increases to a certain extent, the internal polymerization reaction heat will be accelerated at the same time, and the reaction heat cannot be released in time, resulting in detonation.
Therefore, at present, the thickness of AN / MAA copolymer boards prepared with acrylonitrile as the main monomer in China is ≤40mm after foaming, and the high temperature performance, especially the poor environmental resistance, makes it impossible to be used as a structural core material by hot pressing and other technologies. Application in special field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1 A kind of preparation method of novel polymethacrylimide foam

[0024] A kind of preparation method of novel polymethacrylimide foam, comprises the steps:

[0025] 1) Preparation of AN / MAA copolymerized board: Mix methacrylic acid, acrylonitrile, initiator, foaming agent, crosslinking agent, polymerization inhibitor, retarder, nucleating agent, and surfactant into the mold, and use The sealing tape seals the injection hole; then immerses the mold in a 42°C water bath for 36 hours of polymerization reaction, after the curing is completed, raise the temperature of the water bath to 70°C for 28 hours of water bath insulation, take the mold out of the water, demould, and polymerize into a transparent slightly Yellowish AN / MAA copolymerization plate; continue to polymerize the prepared AN / MAA copolymerization plate in an oven at 90°C for 8 hours;

[0026] Wherein, the polymerization formula is as follows:

[0027] (1) Monomer: methacrylic acid 45kg; acrylonitr...

Embodiment 2

[0038] Embodiment 2 A kind of preparation method of novel polymethacrylimide foam

[0039] According to the formula and polymerization process of Example 1, the obtained AN / MAA copolymerization plate was placed in a foaming oven at 130°C for 2 hours, the bubble nuclei of the entire copolymerization plate formed and expanded, and then the temperature of the foaming oven was raised to 180°C ℃ and kept for 1 hour, fully expanded and cured, then taken out to obtain light yellow PMI foam with uniform cells, and then after several hours of aging oven treatment, PMI foam with excellent properties was obtained.

[0040] After testing, the obtained polymethacrylimide foam has a thickness of about 100 mm and its indicators are basically equivalent to those of the foam described in Example 1.

Embodiment 3

[0041] Embodiment 3 A kind of preparation method of novel polymethacrylimide foam

[0042]According to the formula and polymerization process of Example 1, the obtained AN / MAA copolymerization plate was placed in a foaming oven at 130°C for 2 hours, the bubble nuclei of the entire copolymerization plate formed and expanded, and then the temperature of the foaming oven was raised to 180°C ℃ and kept for 2 hours, fully expanded and solidified, then taken out to obtain dark yellow PMI foam with uniform cells, and then after several hours of aging oven treatment, PMI foam with excellent properties was obtained.

[0043] After testing, the obtained polymethacrylimide foam has a thickness of about 100 mm and its indicators are basically equivalent to those of the foam described in Example 1.

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Abstract

The invention relates to a preparation method of a novel polymethacrylimide foam. The method includes the steps of: 1) preparation of an AN / MAA copolymerization board: mixing methacrylic acid, acrylonitrile, an initiator, a foaming agent, a crosslinking agent, a polymerization inhibitor, a retarder and a nucleating agent evenly, then pouring the mixture into a die, dipping the die into water bath to carry out polymerization reaction, at the end of curing, raising the water bath temperature to conduct water bath thermal insulation, then taking the product out and conducting drying to obtain the AN / MAA copolymerization board; and 2) foaming: placing the AN / MAA copolymerization board into a foaming device to perform preheating till formation and expansion of a whole copolymerization board bubble nucleus, then raising the temperature and conduct thermal insulation for certain time, then taking the product out, and carrying out ageing treatment to obtain the polymethacrylimide foam. According to the invention, by adding the specific assistant and regulating the polymerization reaction, the polymethacrylimide foam with a thickness of 100mm and excellent performance can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a novel polymethacrylimide foam, which belongs to the technical field of chemical synthesis. Background technique [0002] Polymethacrylimide (PMI) foam is a lightweight, rigid foam with a 100% closed-cell structure. PMI foam was first developed by the German Rohm company in 1972 and sold under the trade name ROHACELL. With its excellent performance, it is widely used in electronics, launch vehicles, aviation, railway locomotives, ships and antennas, radome, Sports equipment, medical equipment and other fields. [0003] At present, there are two main synthetic routes of PMI foam. One is the production route with methacrylonitrile and methacrylic acid as the main monomers: at present, polymethacrylimide (PMI) foam with a thickness of more than 100mm in China uses methacrylic acid and methacrylonitrile as the main monomer. It is prepared from the main monomer, and its performance cannot be compared with...

Claims

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Application Information

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IPC IPC(8): C08F220/46C08F220/06C08F220/40C08F212/12C08F2/44C08J9/10C08J9/04
CPCC08F220/46C08F2/44C08J9/04C08J9/10C08J2333/20C08F220/06C08F220/40C08F212/12
Inventor 胡传彬舒强舒永春
Owner 宁夏致微材料科技有限公司
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