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Thermotropic aromatic liquid crystal copolyester and preparation method thereof

An aromatic and thermotropic technology, applied in the field of polymer materials, can solve the problems of increased production costs, expensive liquid crystal polyarylate monomers, etc., to achieve reduced melting drops, excellent flame retardant and anti-dripping properties, and wide application prospects Effect

Active Publication Date: 2021-04-06
上海航永光电新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 aromatic liquid crystal copolyester and preparation method thereof
  • Thermotropic aromatic liquid crystal copolyester and preparation method thereof
  • Thermotropic aromatic liquid crystal copolyester and preparation method thereof

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Embodiment 1

[0042] The thermotropic 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 resorcinol, terephthalic acid, 2,7-naphthalene dicarboxylic acid, 4'-hydroxybiphenyl in a 250 ml three-necked round bottom flask at a molar ratio of 40:24:16:20:200:6:6 Acyl-4-carboxylic acid, PTT particles, acetic acid 4-(1,3-dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methylisoindole-2 -yl)phenyl acetate, 4-(1,3-dioxo-1,3,3a,4,7,7a-hexahydro-2H-4,7-methylisoindol-2-yl)benzene Formic acid, and 155 ml of acetic anhydride, with 0.5 wt% sodium acetate as catalyst. The flask was fitted with a sealed glass paddle stirrer, a nitrogen inlet tube and an insulated distillation head. A 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 transesterifi...

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Abstract

The invention discloses a thermotropic aromatic liquid crystal copolyester and a preparation method thereof, the thermotropic 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 prepared from resorcinol, terephthalic acid and 2, 7-naphthalic acid; and 4 '-hydroxybiphenyl-4-carboxylic acid contains a terminal carboxyl group A and a terminal hydroxyl group B at the same time. The thermotropic aromatic liquid crystal copolyester disclosed by the invention has lower melting processing temperature and flame-retardant anti-dripping performance, and can effectively reduce life and property loss caused by fire, so that the thermotropic aromatic liquid crystal copolyester has a wide application prospect in the fields of civil textiles and high-temperature protective materials, in addition, the molecular weight is controllable in the polymerization process, 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 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 polyester...

Claims

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Application Information

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IPC IPC(8): C08G63/60C08G63/78
CPCC08G63/60C08G63/78C08G2250/00
Inventor 陈导刘萍
Owner 上海航永光电新材料有限公司
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