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A preparation method of liquid crystal polymer melt-blown non-woven fabric for high-temperature filtration

A technology of liquid crystal polymers and melt-blown non-woven fabrics, which is applied in the direction of non-woven fabrics, rayon manufacturing, textiles and papermaking, etc., can solve the problems of poor thermal stability, low melting point, etc., and achieve excellent filtering effect, melting Low viscosity, effect of increasing degree of polymerization

Active Publication Date: 2019-11-29
ZHONGYUAN ENGINEERING COLLEGE
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Problems solved by technology

[0004] The present invention proposes a preparation method of liquid crystal polymer melt-blown non-woven fabrics for high-temperature filtration, which solves the problems in the prior art that conventional melt-blown non-woven fabrics have low melting points and poor thermal stability and cannot be used in high-temperature fields

Method used

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  • A preparation method of liquid crystal polymer melt-blown non-woven fabric for high-temperature filtration
  • A preparation method of liquid crystal polymer melt-blown non-woven fabric for high-temperature filtration
  • A preparation method of liquid crystal polymer melt-blown non-woven fabric for high-temperature filtration

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Embodiment 1-7

[0025] Examples 1-7, a liquid crystal polymer melt-blown non-woven fabric used for high-temperature filtration, the structural formula of the liquid crystal polymer used is shown in Table 1.

[0026] The polymerization process of the liquid crystal polymer used in the present invention is as follows:

[0027] The liquid crystal polymer of Example 1: react the monomers 6-hydroxy-2-naphthoic acid and p-hydroxybenzoic acid with excess acetic anhydride respectively, and obtain 6-acetoxy-2-naphthoic acid after washing, purification and drying (ANA) and acetoxybenzoic acid (ABA). ABA and ANA were added into the reactor at a molar ratio of 70:30, and zinc acetate was used as a catalyst in an amount of 0.2% of the total mass of the monomers. After exhausting the air in the reaction system with nitrogen, raise the temperature to 250°C and keep it for 3 hours, then raise the temperature to 280°C within 1 hour, keep it for 1.5 hours, then raise the temperature to 320°C, stop filling nit...

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Abstract

The invention provides a preparation method of a liquid crystal polymer melt-blown nonwoven fabric for high-temperature filtration. The preparation method is used for solving the problems that a conventional melt-blown nonwoven fabric is low in melting point and poor in thermal stability and cannot be used in the field of high temperature in the prior art. A liquid crystal polymer and an additive subjected to vacuum drying are fed into a screw extruder for melting, the molten material is fed into a spinneret by a metering pump, a melt is extruded from the spinneret and then drafted by high-speed hot air, formed fibers are collected in a web forming screen and subjected to after-treatment, and the melt-blown nonwoven fabric is prepared. The invention provides the liquid crystal polymer melt-blown nonwoven fabric which can be used for high-temperature filtration and has outstanding filtration effect. A liquid crystal polymer used in the invention has low melt viscosity, molecular chains can be highly oriented in the direction of external force, and accordingly, a non-woven fabric material with smaller fiber diameter (0.2-10 mu m) and higher strength (breaking strength is higher than or equal to 45 N) can be formed.

Description

technical field [0001] The invention relates to the field of textile materials, in particular to a method for preparing a liquid crystal polymer melt-blown non-woven fabric used for high-temperature filtration. Background technique [0002] The high-temperature dust gas emitted by cement plants, thermal power plants, waste incineration plants and other enterprises is currently the main source of air pollution and the main culprit of smog. Relevant national laws and regulations require the above-mentioned relevant enterprises to filter and remove high-temperature dust gas before discharging, and bag filter is currently the most widely used and most common dust removal equipment. The fibers used in the preparation of bag filters are mainly polyphenylene sulfide fibers, polytetrafluoroethylene fibers, polyimide fibers, glass fibers and basalt fibers with excellent high temperature resistance. These fibers or their mixed fibers are combed into a web and then reinforced by spunl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/435D04H1/46D01F6/92D01F1/10
CPCD01F1/10D01F6/92D04H1/435D04H1/46
Inventor 魏朋张一风郭正章伟
Owner ZHONGYUAN ENGINEERING COLLEGE
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