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Flame-retardant aromatic liquid crystal copolyester and preparation method thereof

A copolyester and aromatic technology, which is applied in the field of flame retardant aromatic liquid crystal copolyester and its preparation, can solve the problems of increased production cost, expensive liquid crystal polyarylate monomers, etc., and achieves a simple preparation process and excellent flame retardancy. Anti-drip performance, the effect of reducing the loss of life and property

Inactive Publication Date: 2021-04-13
上海思涛新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, if the main chain of liquid crystal polyarylate is a rigid linear structure, it needs to be melted at a higher temperature (above 300°C) before it can be formed, and the monomer of liquid crystal polyarylate is relatively expensive, which will further increase the production capacity. cost

Method used

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  • Flame-retardant aromatic liquid crystal copolyester and preparation method thereof
  • Flame-retardant aromatic liquid crystal copolyester and preparation method thereof
  • Flame-retardant aromatic liquid crystal copolyester and preparation method thereof

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Embodiment 1

[0042] The flame-retardant aromatic liquid crystal copolyester of the present embodiment has the following chemical structural formula:

[0043]

[0044] Wherein, n=2~20, m=90~100;

[0045] Add hydroquinone, terephthalic acid, 2,7-naphthalene dicarboxylic acid, 6-hydroxy-2- Naphthoic acid, PBT granules, 3-ethynylaniline, 2-(3-ethynylphenyl)-1,3-dioxoisoindole-5-carboxylic acid, and 160 ml of acetic anhydride with 0.3 wt% zinc acetate as a catalyst. 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 reaction mixture was acetylated at 150°C for 60 minutes in a quicksand bath, and then the temperature was raised to 320°C at a rate of 1.5°C / min for 3 hours of transesterification. At this point, the reaction system was slowly evacuated to a vacuum degree of 3 mbar and the temperature was set to 320° C. for 30 min. The opaque melt was cooled to room temperature and...

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Abstract

The invention discloses flame-retardant aromatic liquid crystal copolyester. The copolyester consists of a main chain which is formed by copolymerizing a rigid mesogenic unit and polyester granules, wherein an end sealing group is a phenylacetylene or norbornene acetylene group; the mesogenic unit is composed of a wholly aromatic diphenol monomer, a wholly aromatic diacid monomer and an AB-type wholly aromatic monomer containing a terminal carboxyl group A and a terminal hydroxyl group B at the same time; the wholly aromatic diphenol monomer is hydroquinone; the wholly aromatic diacid monomers are 1,4-terephthalic acid and 2,6-naphthalic acid; and meanwhile, the AB-type wholly aromatic monomer containing the terminal carboxyl group A and the terminal hydroxyl group B is 6-hydroxy-2-naphthoic acid. The flame-retardant aromatic liquid crystal copolyester has low melting processing temperature and flame-retardant anti-dripping performance, can effectively reduce life and property loss caused by fire disasters, has wide application prospects in the fields of civil textiles and high-temperature protection materials, and has controllable molecular weight in the polymerization process, the preparation process is simpler, more convenient, efficient and environmentally friendly, and no harmful gas is generated during combustion.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a flame-retardant aromatic liquid crystal copolyester and a preparation method thereof. Background technique [0002] As a widely used high polymer material, semi-aromatic polyester has been widely used in civil and industrial fields due to its high strength, high modulus, and low water absorption characteristics. Polyester fiber, also known as polyester, occupies most of the chemical fiber industry. The types of polyesters that have been marketed include PET, PBT, PTT and so on. Because the polymer will undergo reactions such as oxidation and degradation at high temperatures, once it is burned, it is easy to form a fire, which will seriously affect the safety of people's lives and properties. Therefore, it is of great significance to improve the flame retardancy of polyester materials. [0003] The more mature polyester flame retardant modification technology is to use polyes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/91C09K19/38
CPCC08G63/605C08G63/91C08G63/916C09K19/3809
Inventor 刘萍陈导
Owner 上海思涛新材料科技有限公司
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