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A kind of fluorene-containing liquid crystal polymer and its preparation method

A technology of liquid crystal polymer and bisether fluorene, which is applied in the field of polymer chemistry, can solve the problems of fluidity that needs to be improved, and achieve the effects of good appearance and dimensional stability, mild reaction conditions, and low content of small molecules

Active Publication Date: 2022-05-24
NANJING QINGYAN POLYMER NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the application of liquid crystal polymer materials more and more widely, there are more and more higher requirements for its subsequent processability. The existing liquid crystal polymers still have problems such as fluidity that needs to be improved in order to improve their performance. Subsequent processability, expanding its range of applications

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The method for preparing the above-mentioned fluorene-containing liquid crystal polymer comprises the following steps: prepolymerizing a catalyst derived from an aromatic hydroxycarboxylic acid, derived from an aromatic dicarboxylic acid, diether fluorene and acetic anhydride, and performing a prepolymerization reaction on the catalyst; Further termination is carried out to finally obtain the reaction product.

[0023] For the preparation method of the fluorene-containing liquid crystal polymer, the prepolymerization reaction conditions are: refluxing at 130-160° C. for 3-8 hours, then heating up to 280-350° C. for 2-5 hours, and the final polymerization reaction temperature is 230-300° C. , the reaction time is 3-7h.

[0024] In the preparation method of the fluorene-containing liquid crystal polymer, the dosage of acetic anhydride is 1.1 times of the total amount of hydroxyl groups in the monomer.

[0025] In the preparation method of the fluorene-containing liquid c...

Embodiment 1

[0036] 20 moles of p-hydroxybenzoic acid, 40 moles of 2-hydroxy-6-naphthoic acid, 5 moles of terephthalic acid, 15 moles of isophthalic acid, 20 moles of diether fluorene, sulfamic acid and zinc acetate, acetic anhydride at 150°C Under reflux for 6 hours, then heated to 300°C, and reacted for 4 hours to obtain a prepolymer; the prepolymer was further reacted at 260°C for 5 hours to obtain a final polymer.

Embodiment 2

[0038] 14 moles of p-hydroxybenzoic acid, 56 moles of 2-hydroxy-6-naphthoic acid, 3 moles of 1,1'-biphenyl-3,4'-dicarboxylic acid, 12 moles of 1,6-naphthalenedicarboxylic acid, diether fluorene 15 moles, sulfamic acid, zinc acetate, and acetic anhydride were refluxed at 140°C for 7 hours, then heated to 320°C, and reacted for 3 hours to obtain a prepolymer; the prepolymer was further reacted at 250°C for 6 hours to obtain a final polymer.

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PUM

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Abstract

The invention provides a fluorene-containing liquid crystal polymer and a preparation method thereof. The monomers of the present invention include structural units derived from aromatic hydroxycarboxylic acids, structural units derived from aromatic dicarboxylic acids, and bisether fluorene, and the molar percentage ranges of each component are 60-80%, 10-20% %, 10-20%. The present invention introduces the structure of bis-ether fluorene into the liquid crystal polymer, so that the prepared liquid crystal polymer has good fluidity and shows excellent processing performance; and the compound use of two catalysts, sulfamic acid and zinc acetate, The reaction conditions are milder, the content of small molecules in the prepared product is lower, and the products obtained by injection molding have good appearance and dimensional stability.

Description

Technical field: [0001] The invention relates to a fluorene-containing liquid crystal polymer and a preparation method thereof, belonging to the technical field of polymer chemistry. Background technique: [0002] Liquid crystal polymer refers to a polymer compound that can exist in a liquid crystal phase under certain conditions. Its characteristics are that the molecule has a high molecular weight and an orderly orientation. The most important application direction is the production of high-strength and high-modulus fibers, and liquid crystal Reinforced plastics and in-situ composite materials are widely used in aviation, aerospace, sporting goods, automobile industry, marine engineering and petroleum industry and other sectors. As the application of liquid crystal polymer materials becomes more and more extensive, there are more and more higher requirements for its subsequent processability. The existing liquid crystal polymers still have problems such as fluidity that ne...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/66C08G63/60C08G63/83C08G63/87C09K19/38
CPCC08G63/66C08G63/60C08G63/83C08G63/87C09K19/3809
Inventor 张东宝闫茹张奇游石枝
Owner NANJING QINGYAN POLYMER NEW MATERIAL CO LTD