Polymethacrylimide foamable particle rapidly prepared by photo-initiation

A polymethacrylimide and foamed particle technology, which is applied in the field of material preparation, can solve the problems of discontinuous reaction process, long reaction period, low particle yield, etc., so as to shorten the reaction time, improve the compressive strength and Tensile strength, the effect of improving reaction efficiency

Active Publication Date: 2019-03-12
CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above method has the following disadvantages: the reaction cycle is long, requiring more than one week of reaction time, the reaction process is discontinuous, and a large amount of labor is required; the polymer prepared from the polymethacrylimide plate obtained by pouring is very brittle, and it is easy to powder during the crushing process. , the yield of particles obtained is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of polymethacrylimide expandable particle that photoinitiates rapid preparation is prepared according to the following scheme:

[0037] Step (1) pre-polymerization: with the acrylonitrile of 40 parts by weight, the methacrylic acid of 50 parts by weight, the third monomer of 10 parts by weight, the initiator of 1.5 parts by weight, the foaming agent of 3.5 parts by weight, 1.5 parts by weight Mix the cross-linking agent in the reaction kettle evenly and dissolve to obtain a uniform solution. Under the protection of nitrogen, raise the temperature to 50°C, stir and react at 350r / min for 3h, and cool down to 20°C to obtain a reaction solution with a certain viscosity;

[0038] Step (2) Photocuring: Add 0.05 parts by weight of terbium-doped anti-yellowing photoinitiator, 0.5 parts by weight of high-temperature stage initiator and 5 parts by weight of nucleating agent to the obtained reaction solution with a certain viscosity. Dissolve and disperse evenly, then pour ...

Embodiment 2

[0055] A kind of polymethacrylimide expandable particle that photoinitiates rapid preparation is prepared according to the following scheme:

[0056] Step (1) prepolymerization: with the methacrylonitrile of 10 weight parts, the acrylic acid of 80 weight parts, the 3rd monomer of 1 weight part, the initiator of 0.05 weight part, the blowing agent of 2.5 weight parts, 0.1 weight part Mix the cross-linking agent in the reaction kettle evenly, dissolve to obtain a uniform solution, under the protection of nitrogen, raise the temperature to 40°C, stir and react at 200r / min for 1h, and cool down to 20°C to obtain a reaction solution with a certain viscosity;

[0057] Step (2) Photocuring: Add 0.05 parts by weight of terbium-doped anti-yellowing photoinitiator, 0.5 parts by weight of high-temperature stage initiator and 5 parts by weight of nucleating agent to the obtained reaction solution with a certain viscosity. Dissolve and disperse evenly, then pour the reaction solution into ...

Embodiment 3

[0074] A kind of polymethacrylimide expandable particle that photoinitiates rapid preparation is prepared according to the following scheme:

[0075] Step (1) pre-polymerization: with the methacrylonitrile of 90 parts by weight, the methacrylic acid of 20 parts by weight, the third monomer of 30 parts by weight, the initiator of 2.5 parts by weight, the blowing agent of 4 parts by weight, 3 parts by weight The cross-linking agent in parts by weight is mixed evenly in the reactor, and dissolved to obtain a uniform solution. Under the protection of nitrogen, the temperature is raised to 60°C, stirred and reacted at 500r / min for 5h, and the temperature is lowered to 20°C to obtain a reaction solution with a certain viscosity;

[0076] Step (2) Photocuring: Add 0.15 parts by weight of terbium-doped anti-yellowing photoinitiator, 3 parts by weight of high-temperature initiator and 10 parts by weight of nucleating agent to the obtained reaction solution with a certain viscosity, Dis...

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Abstract

The invention relates to the field of new material preparation, and discloses a polymethacrylimide foamable particle rapidly prepared by photo-initiation. Through introducing subsection polymerizationand photo-initiation polymerization, reaction time is greatly shortened, reaction efficiency is improved, and automatic continuous production is realized. Through controlling a thickness of a board within a certain range, and crushing, a crushing yield can be greatly improved. The invention provides a low-cost polymethacrylimide foamable particle rapidly prepared by the photo-initiation and a preparation method thereof, and solves problems of the existing PMI foamable particle preparation process that the reaction period is long, the raw material price is expensive, the crushing yield is low,the adhesive property between the particles of an intra-mode foaming product is poor and the like.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a kind of polymethacrylimide foamable particles prepared rapidly by photoinitiation. Background technique [0002] Polymethacrylimide (PMI) foam material is the foam material with the highest specific strength among all polymer foams. Organic solvents and good compatibility with various resin systems; high specific strength, high heat distortion temperature (180-210°C) and excellent compression creep resistance, the high specific compressive strength of polymethacrylimide foam makes it possible The dimensional stability requirements of the foam are required by the composite material resin curing process at 180-210 °C. With its excellent comprehensive performance, polymethacrylimide foam is an ideal core material for manufacturing lightweight and high-strength composite sandwich structures. It is used in large passenger aircraft and transport aircraft, fighter jets, helicopter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/46C08F212/08C08F220/40C08F212/12C08F220/56C08F222/14C08F220/14C08F212/36C08F220/18C08J9/12C08J9/14C08F8/48C08L33/02C08L33/20C08L33/24
CPCC08F8/48C08F220/06C08F220/46C08J9/10C08J9/104C08J9/125C08J9/142C08J2203/04C08J2203/10C08J2203/12C08J2333/02C08J2333/20C08J2333/24C08F212/08C08F220/40C08F212/12C08F220/56C08F222/102C08F220/14C08F212/36C08F220/18
Inventor 范晓庆董艳丽李克迪徐文生常艺李峰毛敏梁孟佳丽
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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