A method for improving the mechanical properties of liquid crystal polymer products

A technology of liquid crystal polymers and mechanical properties, applied in the direction of liquid crystal materials, chemical instruments and methods, etc., can solve the problems of excessive cooling, uneven heating, etc., and achieve the effects of improving toughness, weakening internal stress, and reducing costs

Active Publication Date: 2021-08-10
SHENZHEN SUNWAY COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Domestic and foreign literature reports that there are many ways to change the molecular orientation of LCP, such as adding a static mixing device inside the die, interweaving polymer molecules at a specific angle through multi-layer co-extrusion, or rotating the die head blow molding. However, the above schemes are all carried out by improving the equipment or selecting the process during the preparation of LCP. After the sample preparation is completed, there are few reports on the literature or patents on improving LCP products (thick products or thin films) by post-processing. , and during the preparation process of the workpiece, it is inevitable that there will be uneven heating and excessive cooling, which will affect its performance

Method used

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  • A method for improving the mechanical properties of liquid crystal polymer products
  • A method for improving the mechanical properties of liquid crystal polymer products
  • A method for improving the mechanical properties of liquid crystal polymer products

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Experimental program
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Effect test

Embodiment 1

[0038] The method for improving the mechanical properties of liquid crystal polymer products, the specific steps are:

[0039] 1) Add protective films on the upper and lower sides of the liquid crystal polymer film - thermosetting polyimide film (see figure 1 ), the area of ​​the thermosetting polyimide film is greater than the area of ​​the liquid crystal polymer film, and the edge of the thermosetting polyimide film is applied with a tiny weight;

[0040] 2) Put the liquid crystal polymer film covered with a protective film into a vacuum drying oven for heat treatment under a nitrogen atmosphere. Before heating up, vacuumize the vacuum oven, inject nitrogen, vacuumize, and inject nitrogen, repeat 5 times , until the residual air in the vacuum drying oven is replaced by a nitrogen atmosphere, and the oven is completely filled with a nitrogen atmosphere; then start to heat up for heat treatment (see figure 2 ), the heat treatment temperature is 250°C, and the time is 6h;

...

Embodiment 2

[0044]The method for improving the mechanical properties of liquid crystal polymer products, the specific steps are:

[0045] 1) Add a protective film—a thermosetting polyimide film on the upper and lower sides of the liquid crystal polymer film, the area of ​​the thermosetting polyimide film is greater than the area of ​​the liquid crystal polymer film, and the thermosetting polyimide film A tiny weight is applied to the edge of the imide film;

[0046] 2) Put the liquid crystal polymer film covered with a protective film into a vacuum drying oven for heat treatment under a nitrogen atmosphere. Before heating up, vacuumize the vacuum oven, inject nitrogen, vacuumize, and inject nitrogen, repeat 5 times , until the residual air in the vacuum drying oven is replaced by a nitrogen atmosphere, and the oven is completely filled with a nitrogen atmosphere; then start to heat up for heat treatment, the temperature of the heat treatment is 250 ° C, and the time is 6 hours;

[0047] ...

Embodiment 3

[0050] The method for improving the mechanical properties of liquid crystal polymer products, the specific steps are:

[0051] 1) Add a protective film—a thermosetting polyimide film on the upper and lower sides of the liquid crystal polymer film, the area of ​​the thermosetting polyimide film is greater than the area of ​​the liquid crystal polymer film, and the thermosetting polyimide film A tiny weight is applied to the edge of the imide film;

[0052] 2) Put the liquid crystal polymer film covered with a protective film into a vacuum drying oven for heat treatment under a nitrogen atmosphere. Before heating up, vacuumize the vacuum oven, inject nitrogen, vacuumize, and inject nitrogen, repeat 5 times , until the residual air in the vacuum drying oven is replaced by a nitrogen atmosphere, and the oven is completely filled with a nitrogen atmosphere; then start to heat up for heat treatment, the temperature of the heat treatment is 250 ° C, and the time is 6 hours;

[0053]...

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Abstract

The invention discloses a method for improving the mechanical properties of liquid crystal polymer products, which belongs to the technical field of polymer composite materials. In the method, the liquid crystal polymer products are subjected to heat treatment under a protective atmosphere. The temperature of the heat treatment is 250°C and the time is 6 hours; the heat treatment During the heating process, when the ambient temperature is below 100°C, the temperature is raised at a rate of 5°C / min; when the temperature is 100-200°C, the temperature is raised at a rate of 2°C / min; During the cooling process of heat treatment, when the ambient temperature is 250‑50 °C, the temperature is lowered at a rate of 1 °C / min. The method is simple and easy to operate, can improve the crystallization inhomogeneity of polymer molecules, obtain LCP products with stable crystal structure, can eliminate the internal stress of the products, and make the parts less prone to brittle cracks or mechanical damage during use, improving the Mechanical properties of LCP products.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a method for improving the mechanical properties of liquid crystal polymer products. Background technique [0002] Liquid Crystal Polymer (LCP for short) is an anisotropic polymer composed of rigid molecular chains and flexible molecular chains. Under certain physical conditions, it can have both liquid fluidity and crystal physical properties substance. These materials have excellent heat resistance and formability. Liquid crystal polymers can be further divided into lyotropic liquid crystal polymers and thermotropic liquid crystal polymers. The former is in a liquid crystal state in a solvent, and the latter is in a liquid crystal state due to temperature changes. Liquid crystal polymer molecules are tightly packed and highly oriented during the molding process, so they have a small linear expansion coefficient, low molding shrinkage, very pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K19/02
CPCC09K19/02
Inventor 刘飞华虞成城王凤宋喆刘开煌苏聪
Owner SHENZHEN SUNWAY COMM
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