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Composite material containing short fibre and thermotropic liquid crystal polymer

A thermotropic liquid crystal and composite material technology, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve problems such as poor melt fluidity, and achieve the effects of improving processing performance, reducing viscosity, and strong rheological properties

Inactive Publication Date: 2004-03-17
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming of poor melt fluidity of the nylon 6 / short fiber composite system, and provide a composite material containing short fiber and thermotropic liquid crystal polymer

Method used

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  • Composite material containing short fibre and thermotropic liquid crystal polymer
  • Composite material containing short fibre and thermotropic liquid crystal polymer
  • Composite material containing short fibre and thermotropic liquid crystal polymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Nylon 6 (relative viscosity is 2.0) (abbreviated as N1 here), glass fiber (GF) and thermotropic liquid crystal polymer (TLCP) (PHB / HNA 73 / 27, Vectra A950, Ticona CelaneseCompany, USA) by weight ratio 70 / 30 / 0, 93 / 0 / 7 and 65 / 30 / 5 are melt-blended on a Haake twin-screw extruder, and the temperature of each section from the feeding port to the die is set at 260-280-280-280°C. The extruded strands were cooled and granulated, and the rheological properties of the obtained pellets were tested on a Goettfert Rheograph 2001 capillary rheometer. The inner diameter of the capillary used was 1 mm and the aspect ratio was 30. The experimental temperature is 280°C, and the material is preheated for 6 minutes. Ignore the inlet pressure correction and perform a Rabinowitsch correction for non-Newtonian behavior. The rheological curve of the obtained material is as figure 1 shown.

Embodiment 2

[0019] Nylon 6 (relative viscosity is 2.36) (abbreviated as N2 here), glass fiber (GF) and thermotropic liquid crystal polymer (TLCP) (PHB / HNA 73 / 27, Vectra A950, Ticona CelaneseCompany, USA) by weight ratio 70 / 30 / 0, 93 / 0 / 7 and 65 / 30 / 5 were melt blended on a Haake twin screw extruder. Blending conditions and rheological performance test conditions are the same as in Example 1. The rheological curve of the obtained material is as figure 2 shown.

Embodiment 3

[0021] Nylon 6 (relative viscosity is 3.2) (abbreviated as N3 here), glass fiber (GF) and thermotropic liquid crystal polymer (TLCP) (PHB / HNA 73 / 27, Vectra A950, Ticona CelaneseCompany, USA) by weight ratio 70 / 30 / 0, 93 / 0 / 7 and 65 / 30 / 5 were melt blended on a Haake twin screw extruder. Blending conditions and rheological performance test conditions are the same as in Example 1. The rheological curve of the obtained material is as image 3 shown.

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Abstract

The present invention discloses one kind of composite containing short fiber and thermotropic liquid crystal polymer, and consists of nylon-6 in 30-75 wt%, short fiber in 9-50 wt% and thermotropic liquid crystal polymer in 1-20 wt%. The said short fiber is glass fiber, carbon fiber, and Kevlar fiber or whisker. The thermotropic liquid crystal polymer is main chain type aromatic copolyester withsmelting temperature of 190-360 deg.c. The composite material of the present invention has excellent flowability nad has unique predominance in producing large thin-wall parts and delicate structureparts.

Description

technical field [0001] The invention relates to a short fiber composite material, in particular to a hybrid composite material containing short fiber and thermotropic liquid crystal polymer. Background technique [0002] Composite material is a multiphase composite system, which can be heterogeneous and heterogeneous or homogeneous and heterogeneous. Therefore, composite materials that meet various purposes can be manufactured through different compositions, different phase structures, different contents and different methods of compounding. Addition of thermotropic liquid crystal polymers (TLCPs) to the polymer can reduce the melt viscosity of the composite and increase the strength and modulus of the material. [0003] In the past, the research on composite materials containing thermotropic liquid crystal polymers mainly focused on the matrix resin / TLCP binary blend system, that is, in-situ composites, and the matrix resins are mostly high-viscosity high-performance resin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08L67/03C08L67/04C08L77/00C08L77/02C08L77/06
CPCC08L67/03C08L67/00C08L77/02C08L77/00C08L77/06C08L67/04
Inventor 何嘉松郑学晶
Owner INST OF CHEM CHINESE ACAD OF SCI