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A kind of polymethacrylimide foam plastics and preparation method thereof

A technology for polymethacrylimide and foamed plastics, which is applied in the field of polymethacrylimide foamed plastics and its preparation, can solve the problems of complex polymerization equipment and low productivity, and achieves simple equipment and improved productivity. , the effect of improving production efficiency

Active Publication Date: 2015-08-05
HAOBO FUJIAN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also uses a thermal initiation mechanism. Although the copolymerization reaction time is shortened to 30 minutes, a nitrogen atmosphere is required, the polymerization equipment is relatively complicated, and the yield of 30% is very low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 400g of acrylonitrile, 600g of methacrylic acid, 40g of AIBN ultraviolet photoinitiator, and 30g of acrylamide crosslinking agent into the reaction vessel and stir evenly. Put the reaction container containing the materials into a crawler-type ultraviolet curing machine for 5 minutes of irradiation, the ultraviolet light wavelength is 365nm, and the power is 500W. The resulting mixture was centrifuged. After the separated liquid is collected, the copolymerization reaction can be resumed. The separated solid was distilled under reduced pressure to obtain a copolymer, which was weighed to obtain 800 g.

Embodiment 2

[0031] Add 440g of acrylonitrile, 560g of methacrylic acid, 1g of TPO ultraviolet photoinitiator, and 40g of methacrylamide crosslinking agent into the reaction vessel and stir evenly. Put the reaction container containing the materials into a crawler-type UV curing machine for 30s irradiation, the wavelength of UV light is 370nm, and the power is 2000W. The resulting mixture was centrifuged. After the separated liquid is collected, the copolymerization reaction can be resumed. The separated solid was distilled under reduced pressure to obtain a copolymer, which was weighed to obtain 600 g.

Embodiment 3

[0033] Add 480g of acrylonitrile, 520g of methacrylic acid, 30g of BDK ultraviolet photoinitiator, and 4g of bismaleimide crosslinking agent into the reaction vessel and stir evenly. Put the reaction container containing the materials into a crawler-type ultraviolet light curing machine for 4 minutes of irradiation, the ultraviolet light wavelength is 220nm, and the power is 1500W. The resulting mixture was centrifuged. After the separated liquid is collected, the copolymerization reaction can be resumed. The separated solid was distilled under reduced pressure to obtain a copolymer, which was weighed to obtain 800 g.

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Abstract

The invention provides a polymethacrylimide foamed plastic and a preparation method of the foamed plastic. The preparation method comprises the following steps of: uniformly mixing a reaction monomer, an ultraviolet light initiator, ad a crosslinking agent, initiating free radical bulk polymerization by ultraviolet radiation, carrying out solid-liquid separation on the product when the conversion rate of the polymerization reaches 60-80%, carrying out reflux on the collected separated liquid for continuous use, carrying out reduced pressure distillation on the solid to obtain a copolymer, crushing the copolymer into powder, mixing a foaming agent with the copolymer powder, hot pressing the powder mixture for foam forming, and carrying out heat treatment on the foamed product to obtain the polymethacrylimide foamed plastic, wherein the monomer is the mixture of acrylonitrile and methacrylic acid or the mixture of methacrylonitrile and methacrylic acid, ultraviolet wavelength is 220-400nm, power is 500-2000W and irradiation time is 30s-5min. The preparation method provided by the invention is high in production efficiency, high in yield, simple in equipment, and simple and convenient to operation.

Description

technical field [0001] The invention relates to a polymethacrylimide foamed plastic and a preparation method thereof. Background technique [0002] Polymethacrylimide (PMI) foam is a high-performance foam with acrylonitrile / methacrylic acid or methacrylonitrile / methacrylic acid copolymer as the matrix resin. Under the same density, PMI foam is currently the foam with the highest strength and stiffness, and it also has excellent heat resistance and creep resistance. PMI foam was first successfully developed by German company Degussa in 1972, and has developed a number of product series with different uses and performances. High-performance sandwich structure composites prepared with high-performance PMI foam as the core material have been widely used in rockets, aircraft, ships, automobiles, high-speed trains, wind power, medical equipment, sporting goods and many other fields. [0003] At present, the preparation method of PMI foam mainly adopts a two-step method: the firs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/46C08F220/50C08F220/06C08F2/48C08J9/14
Inventor 张竞徐体寿吴毅炳邹俊张娇霞
Owner HAOBO FUJIAN NEW MATERIAL TECH
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