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Thermally-induced liquid crystal polymer and preparation method and application thereof

A thermotropic liquid crystal and polymer technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problem of high price, achieve the effects of easy acquisition, improved melt tension, and simple operation

Active Publication Date: 2019-05-31
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the price of 2,6-naphthalenediyl monomers such as 2-hydroxy-6-naphthoic acid or 2,6-naphthalene dicarboxylic acid is relatively high

Method used

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  • Thermally-induced liquid crystal polymer and preparation method and application thereof
  • Thermally-induced liquid crystal polymer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] An embodiment of the preparation method of the thermotropic liquid crystal polymer of the present invention, the preparation method of the thermotropic liquid crystal polymer comprises the following steps:

[0048] S1. Add 6.12kg of raw materials 4-hydroxybenzoic acid (HBA), 2.75kg of biphenol (BP), 7.87kg of acetic anhydride (AA) and 1g of magnesium acetate into the first reactor, and completely replace the reaction vessel with nitrogen Under the protection of nitrogen, the temperature of the reaction system was raised to 140 ° C, and the temperature was maintained at reflux for 2 hours to carry out the acetylation reaction;

[0049] S2. After the acetylation reaction is finished, the material is transferred to the second reactor equipped with a stirrer with a torque sensor, and 1.84kg of phthalic acid (TA) and 0.61kg of isophthalic acid (IA) are put into the second reactor. , then stir, and raise the temperature to 340°C (T1) at a heating rate of 1°C / min, and then rai...

Embodiment 2

[0051] The difference between the preparation method of the thermotropic liquid crystal polymer described in Example 2 and Example 1 lies in the temperature rise rate in S2, see Table 1.

Embodiment 3

[0060] An embodiment of the preparation method of the thermotropic liquid crystal polymer of the present invention, the preparation method of the thermotropic liquid crystal polymer comprises the following steps:

[0061] S1. Add 7.55kg of raw materials 4-hydroxybenzoic acid (HBA), 3.80kg of 6-hydroxy-2-naphthoic acid (HNA), 7.82kg of acetic anhydride (AA) and 1g of magnesium acetate into the first reactor. Replace the atmosphere in the reaction vessel, raise the temperature of the reaction system to 140°C under the protection of nitrogen, and maintain the temperature at reflux for 2 hours to carry out the acetylation reaction;

[0062] S2. After the acetylation reaction is completed, transfer the material to the second reactor equipped with a stirrer with a torque sensor, then raise the temperature to 270°C (T1) at a heating rate of 1°C / min, and then increase the temperature at a rate of 0.4°C / min The heating rate is raised to 310°C (T2), and the generated acetic acid is disc...

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Abstract

The invention discloses a preparation method of thermally-induced liquid crystal polymer. The preparation method includes following steps: S1, in a first reactor, allowing hydroxyl-containing aromaticmonomer and acetic anhydride to be in acetylation reaction; S2, in a second reactor, allowing a reactant obtained after acetylation reaction to be in melt polycondensation reaction or to be in melt polycondensation with aromatic diacid monomer to obtain the thermally-induced liquid crystal polymer. The preparation method can effectively improve melt tension, and the prepared TLCP is light in color. The preparation method is simple in operation, easy-to-obtain in product and suitable for industrial production, and a TLCP thin film can be prepared stably by using the prepared TLCP through a film blowing method. The invention further discloses the TLCP and application thereof in thin film preparation.

Description

technical field [0001] The invention belongs to the field of special engineering plastics, and in particular relates to a thermotropic liquid crystal polymer and its preparation method and application. Background technique [0002] With the rapid increase of signal processing and transmission frequency of electronic equipment, flexible electronic circuit substrates for signal transmission are required to have low dielectric constant (Dk) and low dielectric loss tangent (Df). Thermotropic liquid crystal polymer (TLCP) has excellent dielectric properties, low hygroscopicity, and dimensional stability. After being processed into a film, it can be used as a flexible circuit board substrate with low loss under high-frequency signal transmission conditions. At present, A large-scale marketing promotion is already underway. [0003] The processing of TLCP into a film requires a certain melt tension. However, the melt viscosity of TLCP is often low, resulting in a relatively low me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/60C08G63/06C09K19/38C08L67/04C08J5/18
Inventor 肖中鹏邢羽雄罗德彬曹民周广亮蔡彤旻
Owner KINGFA SCI & TECH CO LTD
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