Liquid crystal flame-retardant foam material and preparation method thereof

A foaming material, liquid crystal technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of environmental pollution, easy decomposition and attenuation of organic flame retardants, and achieve wide applicability, excellent flame retardant performance, and preparation technology. Energy efficient effect

Active Publication Date: 2018-03-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing methods for improving the flame retardancy of polymer foam materials have the following problems: (1) Added organic flame retardants are easy to decompose, which will seriously corrode equipment and cause the attenuation of flame retardancy; High content of flame retardants tends to deteriorate the structural quality and surface quality of the foam, reduce the strength of the foam or its insulating properties; (3) The long-term use of organic flame retardants such as halogens or phosphorus and nitrogen will seriously pollute the environment

Method used

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  • Liquid crystal flame-retardant foam material and preparation method thereof
  • Liquid crystal flame-retardant foam material and preparation method thereof
  • Liquid crystal flame-retardant foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 Preparation of Liquid Crystal Polyester Flame Retardant Foaming Material

[0040] Add 16.02g 1,6-naphthalenediol, 21.62g 2,7-naphthalene dicarboxylic acid, 21.42g4'-hydroxybiphenyl-3-carboxylic acid, 3.84g N-(4- Carboxyphenyl)-4-phenylethynylphthalimide, 4.02g N-(4-acetate phenolic ester)-4-phenylethynylphthalimide, 50mL acetic anhydride and 2mg di Butyl tin oxide. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. Nitrogen flow was introduced, and the acetylation reaction was carried out at a temperature of 130° C. for 45 minutes. The reaction mixture was heated in a quicksand bath at a heating rate of 1.0°C / min, and the reaction temperature rose from 130°C to 280°C. After the reaction is completed, an opaque melt is obtained, which is cooled to room temperature, and the product is removed from the flask, and then ground into a fine powder, which is a liquid crystal polyester powder. The obta...

Embodiment 2

[0041] Example 2 Preparation of liquid crystal polyester imide flame retardant foaming material

[0042] Add 93.10g 1,3-resorcinol, 83.08g 1,3-isophthalic acid, 39.16g N-(3'-hydroxyphenyl) trimellitimide, 41.01g N-(3-Carboxyphenyl)-4-phenylethynylphthalimide, 42.59g N-(3-Acetoxyphenyl)-4-phenylethynylphthalimide , 300mL acetic anhydride and 25mg sodium acetate. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. A moderate nitrogen flow was introduced, and the acetylation reaction was carried out at a temperature of 120° C. for 60 minutes. The reaction mixture was heated in a quicksand bath at a heating rate of 0.5°C / min, and the reaction temperature rose from 120°C to 325°C. At the end of the reaction, an opaque melt was obtained. After cooling to room temperature, the product was removed from the flask, and then ground into a fine powder. The complex viscosity-time curve of its powder sample is heated from 20...

Embodiment 3

[0044] Example 3 Preparation of Liquid Crystal Polyester Flame Retardant Foaming Material

[0045] Add 37.24g 1,4-hydroquinone, 33.23g 1,4-terephthalic acid, 69.06g 3-hydroxybenzoic acid, 18.82g 7-hydroxy-2-naphthoic acid, 27.34g N-(4-Carboxyphenyl)-4-phenylethynylphthalimide, 28.39g N-(4-Phenylacetate)-4-phenylethynylphthalimide , 150mL acetic anhydride and 10mg potassium acetate. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. A moderate nitrogen flow was introduced, and the acetylation reaction was carried out at a temperature of 140° C. for 30 minutes. The reaction mixture was heated in a quicksand bath at a heating rate of 1.0°C / min, and the reaction temperature rose from 140°C to 310°C. At the end of the reaction, an opaque melt was obtained. After cooling to room temperature, the product was removed from the flask, and then ground into a fine powder. The complex viscosity-time curve of its powder sam...

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Abstract

The invention discloses a liquid crystal flame-retardant foam material and a preparation method thereof. The preparation method comprises the following steps: with an aromatic diphenol monomer, an aromatic diacid monomer and a terminated hydroxyl and terminated carboxyl containing aromatic monomer as raw materials, in the presence of an active terminal group, a catalyst and an acetic acid compound, under the protection of nitrogen, reacting for 30-60min at 120-140 DEG C; then, raising the temperature to 280-325 DEG C at the rate of 0.5-1.5 DEG C/min, and reacting for 1-3h to obtain a solid; performing vacuum heating on the solid to obtain the liquid crystal flame-retardant foam material. According to the preparation method, acetic acid as a byproduct remaining during a polycondensation reaction of a liquid crystal polymer is used as a foaming agent, CO2 is decomposed and released to form a microporous structure at high temperature, and a curing reaction is performed on a matrix to forma crosslinked network structure, so that a novel method for preparing the liquid crystal flame-retardant foam material is opened up; particularly, a flame retardant is not required to be added to achieve a flame-retardant effect, and a UL-94 V0 flame retardant rating is reached; in addition, the preparation method has the characteristics of environment friendliness, simpleness, convenience and wide applicability.

Description

technical field [0001] The invention relates to a liquid crystal flame-retardant foaming material and a preparation method thereof, belonging to the field of high-performance polymers. Background technique [0002] Polymer foam materials such as polystyrene foam insulation boards and polyurethane foam products are widely used in the fields of construction, high-speed rail and aviation due to their excellent mechanical, acoustic, electrical, and thermal insulation properties. However, the heat resistance and flame retardancy of polymer foamed materials are poor, and the fire losses caused by their flammability are huge every year. The contradiction between market demand and application safety is becoming more and more prominent, and there is a sharp demand for improving the flame retardancy of polymer foamed materials. Increase. [0003] Flame retardancy is obtained by adding various flame retardants during the preparation of polymer foam materials, among which the most comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/08C08G63/60C08G63/685C09K19/38
CPCC09K19/3809C08G63/605C08G63/685C08J9/08C08J2203/02C08J2367/00
Inventor 管清宝顾嫒娟汤彦甫梁国正袁莉
Owner SUZHOU UNIV
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