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A kind of preparation method of liquid crystal polymer
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A technology of liquid crystal polymers and compounds, applied in liquid crystal materials, chemical instruments and methods, etc., can solve the problems of violent volatilization or even decomposition, difficult to play a positive role, etc., and achieve the effect of good heat resistance stability
Active Publication Date: 2016-01-06
KINGFA SCI & TECH CO LTD
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However, the boiling point of diphenyl phosphite is only 218-219°C, and it will inevitably volatilize violently or even decompose at a processing temperature of 390°C, which will cause diphenyl phosphite to leave the system quickly, so it is difficult to use it as a stabilizer positive role
Method used
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[0067] After the feed is completed, the atmosphere in the reaction vessel is completely replaced with nitrogen, the temperature of the reaction system is increased to 150°C under the protection of nitrogen, and the temperature is maintained at this temperature for reflux for hours to carry out the acylation reaction; after the acylation reaction is completed, the stabilizer is added, and The reaction system was heate...
Embodiment 2
[0069] A liquid crystal polymer was prepared in the same manner as in Example 1, except that the amount of raw materialmonomer added was as shown below.
[0076] Stabilizer: 1.5 grams of tris(2,4-di-tert-butylphenyl) phosphite. The properties are listed in Table 1.
Embodiment 3
[0078] A liquid crystal polymer was prepared in the same manner as in Example 1, except that the amount of raw material monomer added was as shown below.
[0085] Stabilizer: 1.8 g of 2,2'-ethylene bis(4,6-di-tert-butylphenyl) fluorophosphite. The properties are listed in Table 1.
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Abstract
The present invention disclosed a method of preparing a LCD polymer that contains 40-80 mol%of the structural unit (Ⅰ), 10 ~ 30 mol's structural unit (Ⅱ), and 10 ~ ~ 10 ~ 30 mol.The structure unit (Ⅲ) of 30mol %, including the following steps: under the presence of the alumin agent and phospholic acid compounds, the monomers of the structural units represented by the formula (I), (Ⅱ), and (III) respectivelyThe LCD polymer is prepared to be prepared for the hydraulic reactions and ester exchange reactions.The LCD polymer of the present invention does not need to add stabilizers to modified by melting co -mixing. It is the introduction of vicinate compounds during the synthesis process, so that the prepared liquid crystal polymers themselves have good heat resistance stability, and and of.In the process of completing the filler or molding processing, it will not produce black impurities even if it is exposed to high temperature, which can be used to prepare molds.
Description
technical field [0001] The invention relates to a preparation method of a liquid crystal polymer, in particular to a preparation method of a liquid crystal polymer with improved heat resistance stability. Background technique [0002] Liquid crystal polymer (LCP) is unique among various polymers, which has excellent mechanical properties, electrical properties, flame retardancy and easy processing properties. It plays a very important role in high-performance applications, especially in electronic and electrical applications. With the continuous expansion of the application field of liquid crystal polymers, the molding process and post-treatment process need to be carried out under higher temperature conditions, so higher requirements are put forward for its thermal stability. [0003] Liquid crystal polymers generally have high melting points (>300°C) and require high processing temperatures during compounding or molding with fillers. During processing, some fillers or...
Claims
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