Use of liquid crystal polymer as polymer high-temperature lubricant

A technology of liquid crystal polymer and high temperature lubricant, applied in the field of liquid crystal polymer as high temperature lubricant of high polymer, to achieve the effect of improving processing flow performance, reducing resource consumption and improving comprehensive performance

Active Publication Date: 2013-04-03
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there has been no report on the use of thermotropic liquid crystal polymers as high-temperature lubricants

Method used

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  • Use of liquid crystal polymer as polymer high-temperature lubricant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 3 parts of E6000 liquid crystal polymer to 100 parts by weight of polyether ether ketone and mix it with a high-speed mixer at room temperature for 5 minutes at a mixing speed of 120 rpm, and extrude the mixed blend through a twin-screw extruder to granulate , the temperature of each zone of the extruder is 260°C, 300°C, 340°C, 340°C, 340°C, 350°C, 350°C, 350°C, 350°C, 355°C from the feeding section to the die head. The length-to-diameter ratio is 35, the extrusion screw speed is 180 rpm, and the feeding speed is 26 rpm; the single-screw injection molding temperature is 340°C, 350°C, 350°C, 350°C, and 355°C from the feed to the machine head. ℃, the length-to-diameter ratio of the screw of the injection molding machine is 30, the screw speed is 100 rpm, the injection pressure is 80 MPa, the screw back pressure is 10 MPa, the injection time is 10 s, and the cooling time is 6 s. The basic performance is shown in Table 1.

Embodiment 2

[0039] Add 5 parts of A950 liquid crystal polymer to 100 parts by weight of polyphenylene sulfide, mix it with a high-speed mixer at room temperature for 5 minutes, and the mixing speed is 120 rpm, and extrude the mixed blend through a twin-screw extruder to granulate , the temperature of each zone of the extruder is 240°C, 280°C, 300°C, 300°C, 300°C, 300°C, 300°C, 300°C, 300°C, 305°C from the feeding section to the die head. The length-to-diameter ratio is 35, the extrusion screw speed is 180 rpm, and the feeding speed is 26 rpm; the single-screw injection molding temperature is 260°C, 300°C, 300°C, 300°C, 305°C from the feed to the machine head. ℃, the length-to-diameter ratio of the screw of the injection molding machine is 30, the screw speed is 100 rpm, the injection pressure is 80 MPa, the screw back pressure is 10 MPa, the injection time is 10 s, and the cooling time is 6 s. The basic performance is shown in Table 2.

Embodiment 3

[0049] Add 8 parts of HX2000 liquid crystal polymer to 100 parts by weight of polyetherimide, mix it with a high-speed mixer at room temperature for 5 minutes at a mixing speed of 120 rpm, and extrude the mixed blend through a twin-screw extruder to produce pellets, the temperature of each zone of the extruder from the feeding section to the die head is 280°C, 320°C, 320°C, 330°C, 330°C, 330°C, 330°C, 330°C, 330°C, 335°C. The length-to-diameter ratio of the screw is 35, the extrusion screw speed is 180 rpm, and the feeding speed is 26 rpm; the single-screw injection molding temperature is 300°C, 330°C, 330°C, 330°C, 335°C, the aspect ratio of the screw of the injection molding machine is 30, the screw speed is 100 rpm, the injection pressure is 80MPa, the screw back pressure is 10MPa, the injection time is 10s, and the cooling time is 6s. The basic performance is shown in Table 3.

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Abstract

The invention provides a use of a liquid crystal polymer as a polymer high-temperature lubricant. The liquid crystal polymer is a thermotropic liquid crystal polymer, namely, having the fluidity of liquid and the anisotropy of the crystal at a certain temperature. The liquid crystal polymer is added to crystalline high-melting-point polymers or amorphous high-glass-transition-temperature polymers to obviously enhance the melt index or processing fluidity of the polymer and further increase the toughening function. Compared with the addition of some conventional lubricants (e.g. silicone, dimethyl silicone oil and the like), the overall performance is improved significantly.

Description

technical field [0001] The invention relates to the field of modification of polymer materials, in particular to the use of a liquid crystal polymer as a high-temperature lubricant for polymers. Background technique [0002] Thermotropic liquid crystal polymers began to be researched and developed after the first discovery of polyethylene terephthalate (PET) modified p-hydroxybenzoic acid to display thermotropic liquid crystals in 1976 by Eastman Kodak Company of the United States. It was not until the 1980s It is only in the middle and late stages that it enters the practical stage. The American Dartco company first put the "Xydar" liquid crystal polymer on the market, and several companies such as the United States and Japan have also successively researched liquid crystal polymers. Due to the excellent comprehensive properties of liquid crystal polymers in thermal, electrical, mechanical, chemical and other aspects, more and more countries have paid more and more attenti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/06C08L81/02C08L61/16C08L61/02C08L69/00C08L79/08C08L67/00C08L81/06C08L67/04
Inventor 杨桂生俞飞
Owner HEFEI GENIUS NEW MATERIALS
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