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Preparation method for flame-retardant polymethyl methacrylate foam

A technology of polymethyl methacrylate and methyl methacrylate, which is applied in the field of preparation of flame-retardant polymethyl methacrylate foam

Inactive Publication Date: 2018-12-18
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

But so far, flame-retardant polymethyl methacrylate foam has not been reported yet, and there are a small number of reports in domestic and foreign patents about flame-retardant PU, P(M)I, and PVC foams.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of flame-retardant polymethyl methacrylate foam, is characterized in that, comprises the steps:

[0036] Add 0.5 parts by weight of initiator, 15 parts by weight of blowing agent, 0.25 parts by weight of crosslinking agent, 0.9 parts by weight of Chain transfer agent, stir evenly and prepolymerize in the prepolymerization tank at a temperature between 80°C to form a viscous slurry. After cooling to a temperature between 40°C with ice water, add 8 parts by weight of nucleating agent and 5 parts by weight of carbonization agent, 3 parts by weight of nickel-based cadmium-free foaming accelerator, 40 parts by weight of flame retardant, and 12 parts by weight of flame retardant synergist and stirred evenly, then injected into the mold and further polymerized at a temperature between 90 ° C, Then foaming is carried out at a temperature between 200° C. to obtain a flame-retardant polymethyl methacrylate foam.

[0037] Described nickel-based cadmium-free f...

Embodiment 2

[0049] A preparation method of flame-retardant polymethyl methacrylate foam, is characterized in that, comprises the steps:

[0050] Add 0.1 weight part of initiator, 1 weight part of foaming agent, 0.1 weight part of crosslinking agent, 0.1 weight part of Chain transfer agent, stir evenly and pre-polymerize in the pre-polymerization tank at a temperature between 60°C to form a viscous slurry. After cooling to a temperature between 30°C with ice water, add 0.1 parts by weight of nucleating agent and 1 part by weight of carbonization agent, 0.1 parts by weight of nickel-based cadmium-free foaming accelerator, 10 parts by weight of flame retardant, and 5 parts by weight of flame retardant synergist and stirred evenly, then injected into the mold and further polymerized at a temperature between 40 ° C, Then foaming is carried out at a temperature between 150° C. to obtain a flame-retardant polymethyl methacrylate foam.

[0051] Described nickel-based cadmium-free foam accelerato...

Embodiment 3

[0063] A preparation method of flame-retardant polymethyl methacrylate foam, is characterized in that, comprises the steps:

[0064] Add 1 part by weight of initiator, 30 parts by weight of blowing agent, 0.5 parts by weight of crosslinking agent, 2 parts by weight of Chain transfer agent, stir evenly and pre-polymerize in the pre-polymerization tank at a temperature between 100°C to form a viscous slurry. After cooling to a temperature between 50°C with ice water, add 15 parts by weight of nucleating agent and 10 parts by weight of carbonization agent, 5 parts by weight of nickel-based cadmium-free foaming accelerator, 70 parts by weight of flame retardant, and 20 parts by weight of flame retardant synergist and stirred evenly, then injected into the mold and further polymerized at a temperature between 150 ° C, Then foaming is carried out at a temperature between 250° C. to obtain a flame-retardant polymethyl methacrylate foam.

[0065] Described nickel-based cadmium-free f...

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Abstract

The invention relates to a preparation method for flame-retardant polymethyl methacrylate foam, belonging to the field of preparation of new materials. According to the invention, an initiator, a foaming agent, a cross-linking agent and a chain transfer agent are added into a mixture composed of methyl methacrylate and comonomers; after viscous slurry is formed after prepolymerization, a nucleating agent, a carbonizing agent, a nickel-based cadmium-free foaming accelerator, a flame retardant and a flame retardant synergist are added; and further polymerization is carried out and then foaming is performed so as to obtain the flame-retardant polymethyl methacrylate foam. The carbonizing agent used in the invention can carbonize the surface of a polymer in the process of combustion so as to form a carbonized layer having insulating effect. The added flame retardant can decompose with heat and absorbs heat to realize cooling effect, thereby achieving flame retarding effect. Thus, the polymethyl methacrylate foam prepared in the invention has the characteristics of light weight, high strength, easy foaming, capacity of being extinguished without fire and basically no generation of blacksmoke during combustion.

Description

technical field [0001] The invention relates to the field of material preparation, in particular to a method for preparing a flame-retardant polymethyl methacrylate foam. Background technique [0002] In order to reduce the weight, more and more foam polymer materials are used in aerospace, wind power equipment, automobile manufacturing, rail transit and other fields. However, once a fire breaks out, the polymer material is heated and decomposed during combustion, and undergoes a strong oxidation reaction with the air, and the free radicals produced will produce a continuous chain reaction. At the same time, a large amount of toxic and corrosive harmful smoke is produced, and 80% of the fatal accidents in the fire are caused by suffocation of smoke and toxic gas. Large heat release, high temperature, fast burning speed and a large amount of toxic black smoke, all of which bring difficulties to firefighting, escape, lifesaving and other work. Therefore, in order to ensure t...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F222/26C08F220/54C08F212/36C08F220/20C08F230/02C08F2/44C08K3/22C08K3/26C08K5/524C08K9/10C08K3/02C08J9/04
CPCC08F2/44C08F220/14C08J9/04C08K3/02C08K3/22C08K3/2279C08K3/26C08K5/524C08K9/10C08J2333/12C08K2003/265C08K2003/2227C08K2003/2224C08K2003/2255C08K2003/026C08F220/1803C08F222/26C08F220/1804C08F220/1802
Inventor 徐文生李锋李克迪范晓庆常艺孟佳丽
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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