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A kind of preparation method of flame-retardant polymethacrylimide foam and its parts

A polymethacrylimide and flame retardant technology, which is applied in the field of preparation of flame retardant high-performance polymethacrylimide materials and their parts, can solve the problem that the thickness of the flame retardant layer is small and cannot meet the requirements. , low peel strength of parts, etc., to achieve the effect of good flame retardant effect, high peel strength and reduced impact

Active Publication Date: 2018-11-09
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

Therefore, there are many literature reports at home and abroad that the flame retardant requirements can be achieved through surface soaking and other treatment methods. The Chinese patent CN02273716.2 reports that wooden boards are soaked in flame retardants, and then made into composite parts to achieve flame retardant Inflammability effect, Chinese patent CN201520908133.9 reports that the foam is soaked in a flame retardant and then made into a composite material to achieve the purpose of flame retardancy. However, the thickness of the flame-retardant layer of the composite material described in these patents is small, and only the surface The first layer, because the flame retardant exists on the surface, the peeling strength of the part is low, so it can only be used in fields with low peeling performance requirements, and cannot meet the requirements for structural materials in rail transit, ships and other fields

Method used

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  • A kind of preparation method of flame-retardant polymethacrylimide foam and its parts
  • A kind of preparation method of flame-retardant polymethacrylimide foam and its parts
  • A kind of preparation method of flame-retardant polymethacrylimide foam and its parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of pre-polymerized board: 44 parts by weight of methacrylic acid, 43 parts by weight of methacrylonitrile, 5 parts by weight of acrylamide monomer, 0.5 parts by weight of initiator, 5 parts by weight of foaming agent, and 0.1 part by weight of crosslinking agent as raw materials And mixed and stirred to obtain a uniform mixed liquid, then pre-polymerized in a closed mold at 42°C for 55h to obtain a transparent pre-polymerized block body, and then post-polymerized at 80°C for 70h.

[0050] Foaming: Then place the prepolymerized board in dimethyl propyl phosphonate and heat it to 140°C for 2 hours, heat it to 180°C for 2 hours, and cool it down to room temperature to get a flame retardant layer with a thickness of 10.5mm and a density of 155kg / m 3 flame retardant foam.

[0051] After the foam is peeled, the surface is rinsed and dried. The compressive strength of the obtained foam is 4.8MPa, and then it is combined with the basalt skin by hot pressing to make...

Embodiment 2

[0053] Preparation of pre-polymerized board: 44 parts by weight of methacrylic acid, 43 parts by weight of methacrylonitrile, 5 parts by weight of acrylamide monomer, 0.5 parts by weight of initiator, 5 parts by weight of foaming agent, and 0.1 part by weight of crosslinking agent as raw materials And mixed and stirred to obtain a uniform mixed liquid, then pre-polymerized in a closed mold at 42°C for 55h to obtain a transparent pre-polymerized block body, and then post-polymerized at 80°C for 70h.

[0054] Foaming: Then place the prepolymerized board in triethyl phosphate and heat it to 150°C for 2 hours, heat it to 185°C for 2 hours, and cool it down to room temperature to get a flame retardant layer with a thickness of 12mm and a density of 150kg / m 3 flame retardant foam.

[0055] After the foam is peeled, the surface is rinsed and dried. The compressive strength of the obtained foam is 4.5MPa, and then it is combined with the basalt skin by hot pressing to make a product. ...

Embodiment 3

[0057] Preparation of pre-polymerized board: 44 parts by weight of methacrylic acid, 43 parts by weight of methacrylonitrile, 5 parts by weight of acrylamide monomer, 0.5 parts by weight of initiator, 5 parts by weight of foaming agent, and 0.1 part by weight of crosslinking agent as raw materials And mixed and stirred to obtain a uniform mixed liquid, then pre-polymerized in a closed mold at 42°C for 55h to obtain a transparent pre-polymerized block body, and then post-polymerized at 80°C for 70h.

[0058] Foaming: Then place the prepolymerized board in triethyl phosphate and heat it to 160°C for 2.5 hours, heat it to 190°C for 2 hours, and cool it down to room temperature to get a flame retardant layer with a thickness of 12mm and a density of 145kg / m 3 flame retardant foam.

[0059] After the foam is peeled, the surface is rinsed and dried. The compressive strength of the obtained foam is 4.2MPa, and then it is combined with the basalt skin by hot pressing to make a produ...

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Abstract

The invention discloses a preparation method of flame retardant polymethacrylimide foam and a product thereof. The preparation method comprises the following steps: (1) uniformly mixing (methyl)acrylic acid, (methyl)acrylonitrile, a third monomer, an initiator, a foaming agent and a cross-linking agent at room temperature to obtain a mixed solution, injecting the mixed solution into an enclosed container and carrying out prepolymerization so as to obtain a transparent prepolymer plate; and (2) placing the transparent prepolymer plate into a high-boiling-point liquid flame-retardant and carrying out foaming treatment, and cooling to room temperature so as to obtain the flame retardant polymethacrylimide(PMI) foam. By the method, the flame retardant PMI foam with a certain thickness of flame retardant layer can be efficiently prepared at low cost. The PMI foam is applicable to a core material with a sandwiched structure. Flame extension performance of a composite product can meet requirements of BS6853:1999 on various train floors, wallboards, top boards, etc. In addition, peel strength of the product is not reduced, and the product can be applied in fields of rail transit, ships, automobile, etc.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of a flame-retardant high-performance polymethacrylimide material and its parts. Background technique [0002] In order to reduce the weight, more and more polymer materials are used in aerospace, wind power equipment, automobile manufacturing, rail transit and other fields. Once a fire occurs, toxic gases will be generated, and the heat and temperature generated by the combustion of polymer materials are large. , The burning speed is fast, and it is easy to cause incomplete combustion and produce a large amount of black smoke, which brings difficulties to fire fighting, escape, lifesaving and other work. On November 18, 1987, 31 people died (including 1 fire squadron leader) and a large number of people were injured (including 6 firefighters) at the King's Cross Station of the London Underground; On the evening of October 28, 1995, a fire broke ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/06C08F220/42C08F220/56C08F2/44C08K5/5333C08K3/36C08K5/521C08J9/04C08L33/02
CPCC08F2/44C08F220/06C08J9/04C08J2201/036C08J2333/02C08K3/36C08K5/521C08K5/5333C08F220/42C08F220/56
Inventor 范晓庆李克迪孟佳丽吴素萍
Owner CASHEM ADVANCED MATERIALS HI TECH CO LTD ZHEJIANG
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