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Liquid crystal polyester, liquid crystal polyester composition composed of liquid crystal polyester, and applications of liquid crystal polyester composition

A technology of liquid crystal polyester and composition, applied in the field of polymer materials, can solve the problems of reduced width of pin hole resin, influence of fluidity of LCP material, poor filling, etc., and achieve excellent fluidity effect

Active Publication Date: 2015-06-24
ZHUHAI WANTONG SPECIAL ENG PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, while improving the HDT of the LCP material, the fluidity of the LCP material is also affected to a certain extent. Taking the planar connector represented by the CPU socket as an example, the number of pins increases with the high-density requirements of the connector. It is also increasing, and the pitch of the pins is correspondingly reduced, and the width of the resin that holds the pin holes is also correspondingly reduced. When traditional LCP materials are used to injection mold such connectors, local poor filling may occur due to insufficient fluidity.

Method used

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  • Liquid crystal polyester, liquid crystal polyester composition composed of liquid crystal polyester, and applications of liquid crystal polyester composition
  • Liquid crystal polyester, liquid crystal polyester composition composed of liquid crystal polyester, and applications of liquid crystal polyester composition

Examples

Experimental program
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Effect test

Embodiment 1

[0058] Embodiment 1: the preparation of liquid crystal polyester

[0059] Add 6.215kg (45mol) HBA, 0.465kg (2.5mol) BP, 2.75kg (25mol) HQ, 2.92kg (17.6mol) TPA, 2.164kg (10mol) NDA, 11.23kg (110mol) AA and 3g magnesium acetate; after replacing nitrogen, raise the reaction temperature to 145°C under nitrogen atmosphere for 2 hours; then raise the temperature to 330°C at a rate of 60°C / hour ~355°C (the highest reaction temperature for pre-polymerization), keep the reaction at this temperature for 30 minutes, then vacuumize to 200Pa within 30 minutes and continue the reaction until the stirring power reaches the predetermined value. Then add nitrogen into the reactor until the pressure is 0.2MPa, discharge through the valve at the bottom of the reactor, and then granulate after cooling;

[0060] Add 10kg of the above prepolymer particles into a 50L reactor with a stirrer, and then perform solid phase polycondensation reaction at 260° C. and a vacuum of 120 Pa for 5 hours to obt...

Embodiment 2~12

[0061] Embodiment 2~12: the preparation of liquid crystal polyester

[0062] According to the formula in Table 1, HBA, BP, HQ, TPA, NDA, AA and magnesium acetate are charged, the amount of AA is 1.1 times of the total molar number of monomer hydroxyl groups, and the amount of magnesium acetate is based on the total number of monomers. 0.02% by weight, its preparation method is the same as in Example 1; the melting temperature and melt viscosity of the gained liquid crystal polyester are listed in Table 1.

[0063] Table 1

[0064]

Embodiment 13

[0065] Embodiment 13: Preparation of liquid crystal polyester composition

[0066] According to the proportioning of table 2, the 70wt% liquid crystal polyester prepared by embodiment 1 is added into the extruder from the main feeding port of the twin-screw extruder, and the 30 wt% glass fiber is fed from the side of the twin-screw extruder Put it into the extruder; melt and mix at the screw speed of 300RPM, the temperature of the screw barrel is 290-355°C, and extrude to obtain the liquid crystal polyester composition. The melting temperature, heat distortion temperature and flow properties of the liquid crystal polyester composition were tested respectively, and the test results are listed in Table 2.

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Abstract

The invention discloses a liquid crystal polyester comprising repeated units of (I), (II), (III), (IV), and (V) corresponding to monomers of (A), (B), (C), (D), and (E) respectively. Based on the total amount of the repeated units, molar ratio of (I) ranges from 45 to 65%; the total molar ratio of (II) and (III) ranges from 17.5 to 27.5%, wherein the amount of (II) accounts for 0 to 25% of the total amount of (II) and (III); and molar ratio of (IV) and (V) ranges from 17.5 to 27.5%, wherein the amount of (IV) accounts for 25 to 60% of the total amount of (IV) and (V). The invention also discloses a liquid crystal polyester composition containing the liquid crystal polyester. The liquid crystal polyester composition comprises 50 to 75wt% of the liquid crystal polyester, and 25 to 50wt% of an inorganic filling material. Melting temperature of the liquid crystal polyester composition is lower than 355 DEG C; HDT>=275 DEG C; liquidity is excellent; and the liquid crystal polyester composition can be used for preparation of electric product couplers.

Description

technical field [0001] The invention relates to the field of macromolecular materials, in particular to a liquid crystal polyester, a liquid crystal polyester composition composed of it and applications thereof. Background technique [0002] Liquid crystal polyester (LCP) has excellent heat resistance, dimensional stability, electrical properties and processing fluidity, and has been widely used in connectors and other fields. [0003] With the miniaturization and thinning of electronic and electrical components, the development of densification, miniaturization and high-density assembly technology of electronic components has been promoted, and the temperature resistance requirements of the LCP materials used are also continuously increasing. In particular, the use of Surface Mount Technology (SMT) puts forward higher requirements on the temperature resistance of the LCP material used, usually requiring its heat distortion temperature (HDT) to be greater than 270°C. [000...

Claims

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Application Information

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IPC IPC(8): C08G63/60C08G63/80C08L67/03C08L67/04C08K7/14
Inventor 肖中鹏李闻达许柏荣曹民曾祥斌蔡彤旻
Owner ZHUHAI WANTONG SPECIAL ENG PLASTICS CO LTD
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