Thermotropic anti-molten-drop aromatic liquid crystal copolyester and preparation method thereof

An anti-melting and aromatic technology, which is applied in the directions of liquid crystal materials, chemical instruments and methods, can solve the problems of increasing production costs, expensive liquid crystal polyarylate monomers, etc., and achieves a simple preparation process, excellent flame retardant and anti-dropping. Performance, the effect of a wide range of application prospects

Pending Publication Date: 2021-03-30
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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  • Thermotropic anti-molten-drop aromatic liquid crystal copolyester and preparation method thereof
  • Thermotropic anti-molten-drop aromatic liquid crystal copolyester and preparation method thereof
  • Thermotropic anti-molten-drop aromatic liquid crystal copolyester and preparation method thereof

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Embodiment 1

[0042] The thermotropic anti-droplet aromatic liquid crystal copolyester of this 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 particles, 3-ethynyl-N-methylaniline, 2-(3-ethynylphenyl)-1,3-dioxoisoindole-5-carboxylic acid, and 180 ml of acetic anhydride in 0.2 The wt% of germanium dioxide is the 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 140°C for 40 minutes in a quicksand bath, and then the temperature was raised to 300°C at a rate of 0.5°C / min for 2 hours of transesterification. At this point, the reaction system was slowly evacuated to a vacuum degree of 2 mbar and the temperature was set to 310° C. for 20 min. The opaque melt was coole...

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Abstract

The invention discloses a thermotropic anti-molten-drop aromatic liquid crystal copolyester and a preparation method thereof, the thermotropic anti-molten-drop aromatic liquid crystal copolyester comprises a main chain formed by copolymerization of a rigid mesogenic unit and polyester granules, and an end sealing group is a phenylacetylene or norbornene acetylene group; the mesogenic unit is composed of 4, 4 '-dihydroxybiphenyl, terephthalic acid and 2, 7-naphthalic acid, and 6-hydroxy 2naphthoic acid containing a terminal carboxyl group A and a terminal hydroxyl group B. The thermotropic anti-molten-drop aromatic liquid crystal copolyester has low melting processing temperature and flame-retardant anti-molten-drop performance, can effectively reduce life and property losses caused by firedisasters, has wide application prospects in the fields of civil textiles and high-temperature protection materials, and has the advantages of controllable molecular weight in the polymerization process, and the preparation process is simpler, more convenient, efficient and environment-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 thermotropic anti-droplet 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/685C08G63/60C08G63/80C09K19/38
CPCC08G63/685C08G63/60C08G63/80C09K19/3809
Inventor 陈导刘萍
Owner 上海思涛新材料科技有限公司
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