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Liquid crystal polymer and preparation method thereof, and liquid crystal polymer composite materials

A liquid crystal polymer and composite material technology, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of insufficient thermal deformation temperature, insufficient bonding line, poor recyclability, etc., to improve the comprehensive mechanical properties and processing temperature. The effect of widening the range and easy control of the reaction end point

Inactive Publication Date: 2012-08-22
SHENZHEN LINKCONN ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the modulus is not high enough, the strength is not as good as high-temperature nylon (PPA) and polyphenylene sulfide (PPS), etc., the bonding line is not strong enough, easy to delaminate, poor recyclability, high temperature is easy to foam, and the heat distortion temperature is not high enough.
Especially when LCP materials are applied to thin cards and ultra-thin cards, such as ultra-thin SIM cards of various smartphones, it is often found that the plastic is severely deformed after the reflow oven, has poor fluidity, is difficult to form, and has high temperature blistering and strength. Not enough defects

Method used

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  • Liquid crystal polymer and preparation method thereof, and liquid crystal polymer composite materials
  • Liquid crystal polymer and preparation method thereof, and liquid crystal polymer composite materials
  • Liquid crystal polymer and preparation method thereof, and liquid crystal polymer composite materials

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preparation example Construction

[0027] The embodiment of the present invention additionally provides a method for preparing the above-mentioned liquid crystal polymer, which includes the following steps:

[0028] S01: Select and mix raw materials according to molar percentages, the raw materials include 20% to 70% of p-hydroxybenzoic acid, 5% to 40% of 2,6-naphthalene dicarboxylic acid, and 5% to 20% of 6-hydroxy-2-naphthoic acid and 4,4-dihydroxybenzophenone 5% to 40%;

[0029] S02: Add catalyst and acetic anhydride to the mixture of raw materials, make acetic anhydride esterify with the raw materials containing phenolic hydroxyl groups, and then separate acetic acid by exchanging and displacing with the raw materials containing carboxyl groups to obtain liquid crystal polymerization Prepolymers of substances;

[0030] S03: heating the prepolymer of the liquid crystal polymer in vacuum at 330° C. to 350° C. to obtain the liquid crystal polymer.

[0031] In step S01, all the raw materials can be prepared b...

Embodiment 1

[0042]According to the molar ratio of 40:20:10:20:5:5, p-hydroxybenzoic acid (HBA), 2,6-naphthalene dicarboxylic acid (NDA), 6-hydroxy-2-naphthoic acid (HNA), 4,4 - Dihydroxybenzophenone (HBQ), terephthalic acid (TA) and biphenol (BHQ), and the corresponding amount of acetic anhydride and 0.05 molar parts of catalyst potassium acetate are added to the Hastelloy with reflux water separation device The reactor was replaced three times with 99.999% nitrogen, and the temperature was raised to 180° C. to completely reflux the solvent into the reactor. After 45 minutes, the solvent was separated, and a total of 30% of the solvent amount was separated. Raise the temperature to 330°C, keep the pressure at 1 atmosphere, continue to raise the temperature to 350°C, and start the vacuum device at the same time to reduce the pressure to below 100Pa, until the torque of the stirring blade of the reactor reaches the maximum and the reaction ends to obtain a liquid crystal polymer.

Embodiment 2

[0044] According to the molar ratio of 50:15:10:15:5:5, p-hydroxybenzoic acid (HBA), 2,6-naphthalene dicarboxylic acid (NDA), 6-hydroxy-2-naphthoic acid (HNA), 4,4 -Dihydroxybenzophenone (HBQ), terephthalic acid (TA) and biphenol (BHQ), and the corresponding amount of acetic anhydride and 0.05 mole parts of catalyst zinc acetate are added to the Hastelloy with reflux water separation device The reactor was replaced three times with 99.999% nitrogen, and the temperature was raised to 180° C. to completely reflux the solvent into the reactor. After 45 minutes, the solvent was separated, and a total of 30% of the solvent amount was separated. Raise the temperature to 330°C, keep the pressure at 1 atmosphere, continue to raise the temperature to 350°C, and start the vacuum device at the same time to reduce the pressure to below 100Pa, until the torque of the stirring blade of the reactor reaches the maximum and the reaction ends to obtain a liquid crystal polymer.

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Abstract

The invention provides a liquid crystal polymer which is prepared by polycondensing para-hydroxybenzoic acid, 2,6-naphthalic acid, 6-hydroxy-2-naphthoic acid and 4,4-dihydroxybenzophenone. The invention also provides a preparation method of the liquid crystal polymer. Besides, the invention also provides liquid crystal polymer composite materials containing the liquid crystal polymer. The melting point of the liquid crystal polymer is moderate, and the processing temperature range is widened; and ketone characteristic groups are introduced into the polymer chain, thereby enhancing the comprehensive mechanical properties of the polymer. Further more, the preparation method of the liquid crystal polymer is simple, has the advantage of easily controlled reaction end point, and can ensure the reproducibility of the polymer quality. In addition, the liquid crystal polymer can be used as a resin for preparing multiple liquid crystal polymer composite materials.

Description

technical field [0001] The invention belongs to the technical field of liquid crystal polymer materials, and in particular relates to a liquid crystal polymer, a preparation method thereof and a liquid crystal polymer composite material. Background technique [0002] Liquid crystal polymer (LCP) is a liquid crystal polymer with a relatively unique molecular structure and thermal behavior. The molecules of LCP are composed of rigid rod-like molecular chains. After being melted by heat or dissolved by a solvent, a transitional intermediate phase state-liquid crystal state with both solid and liquid properties is formed. The molecular arrangement is between ideal liquid and crystal. One-dimensional or two-dimensional long-range order, but there is still a certain degree of order in molecular orientation, showing good anisotropy. LCP has high strength, high modulus and self-reinforcement properties, outstanding heat resistance, excellent resistance to alternating cold and heat,...

Claims

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Application Information

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IPC IPC(8): C08G63/60C09K19/38C08L67/03C08L67/04
Inventor 王涧鸣王贤文李再先
Owner SHENZHEN LINKCONN ELECTRONICS
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