Method of coating surface of polyphenylene sulfide filter material with polytetrafluoroethylene

A technology of polytetrafluoroethylene and filter materials, applied in separation methods, filtration separation, chemical instruments and methods, etc., can solve problems such as weak surface adhesion, poor film formation and adhesion, and shortened service life of filter materials , to achieve the effect of a simple method

Inactive Publication Date: 2017-06-23
ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PTFE is a typical non-polar molecule, the intermolecular interaction is weak, the macromolecular segments are prone to slip or break, and the surface adhesion is weak, so the adhesion and film-forming properties of PTFE on the surface of PPS filter material poor sex
[0003] In addition, in a high-temperature and high-humidity environment, SO in flue gas 3 And NO, etc. interact with water vapor, and it is easy to condense into mixed acid dew on the surface of the fiber, resulting in strong chemical corrosion and damage to the filter bag
At the same time, when the flue gas contains oil droplets and oil mist, these substances are easy to bond with soot and other substances on the surface of the filter material, shortening the service life of the filter material
[0004] Therefore, at present, the polyphenylene sulfide filter material is not resistant to corrosion. Coating PTFE on the surface of PPS can improve the corrosion resistance of the PPS filter material, but the molecular structure of PTFE makes the film-forming property and adhesion poor; and the filter material It is easy to form acid dew on the surface, resulting in strong chemical corrosion and damage to the filter bag

Method used

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  • Method of coating surface of polyphenylene sulfide filter material with polytetrafluoroethylene
  • Method of coating surface of polyphenylene sulfide filter material with polytetrafluoroethylene

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preparation example Construction

[0025] Preparation of polytetrafluoroethylene composite coating agent: take PTFE with a solid content of 40% as the dispersion liquid and stir in a stirrer for 30 minutes, then add respectively an acrylic adhesive with a solid content of 30%, and an aqueous solution with a solid content of 35%. Epoxy resin, wherein the mass ratio of polytetrafluoroethylene, acrylate adhesive and waterborne epoxy resin is: 82:15:3, stirs 30min to obtain described polytetrafluoroethylene composite coating agent;

[0026] PTFE has a non-polar molecular structure, weak intermolecular force, poor surface adhesion and melt fluidity, cannot form a complete and continuous coating on the surface of the filter material and has low bonding fastness with PPS, PTFE cannot A single film former is used as the coating material; among them, water-based epoxy resin has good adhesion and adhesion and good film-forming performance, so an appropriate amount of water-based epoxy resin can be added to the composite c...

Embodiment 1

[0028] (1) Preparation of polytetrafluoroethylene composite coating agent: PTFE with a solid content of 40% is a dispersion liquid and stirred in an agitator for 30 min, then adding a acrylate adhesive with a solid content of 30% respectively, with a solid content of 35% % of water-based epoxy resin, wherein the mass ratio of polytetrafluoroethylene, acrylate adhesive and water-based epoxy resin is: 82:15:3, stir 30min to obtain the polytetrafluoroethylene composite coating agent;

[0029] (2) The polytetrafluoroethylene composite coating agent, methyl silicone oil, waterproofing agent methyl silicate, penetrating agent alkylphenol polyoxyethylene ether and distilled water are respectively in a mass ratio of 10:1:3:1:200, Add it into the agitator and stir for 30 minutes to obtain the composite finishing solution;

[0030] (3) Immerse the polyphenylene sulfide filter material in the above-mentioned composite finishing agent, soak at room temperature for 30 minutes; then success...

Embodiment 2

[0033] (1) Preparation of polytetrafluoroethylene composite coating agent: PTFE with a solid content of 40% is a dispersion liquid and stirred in an agitator for 30 min, then adding a acrylate adhesive with a solid content of 30% respectively, with a solid content of 35% % of water-based epoxy resin, wherein the mass ratio of polytetrafluoroethylene, acrylate adhesive and water-based epoxy resin is: 82:15:3, stir 30min to obtain the polytetrafluoroethylene composite coating agent;

[0034] (2) Add polytetrafluoroethylene composite coating agent, phenyl silicone oil, hydroxy-terminated siloxane concentrated emulsion, sec-octyl alcohol polyoxyethylene ether and distilled water at a mass ratio of 11:2:5:2:200, respectively. into the agitator and stirred for 35 minutes to obtain the composite finishing liquid;

[0035] (3) Immerse the polyphenylene sulfide filter material in the above-mentioned composite finishing agent, soak at room temperature for 50 minutes; then dry at 110°C f...

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Abstract

The invention discloses a method of coating the surface of a polyphenylene sulfide filter material with polytetrafluoroethylene. The method comprises the following steps: (1) preparing a polytetrafluoroethylene composite coating agent from a PTFE dispersion liquid, an acrylate adhesive and waterborne epoxy resin according to the mass ratio of 82 to 15 to 3; (2) preparing a composite finishing liquid from the polytetrafluoroethylene composite coating agent, silicone oil, an organosilicon waterproofing agent, a penetrating agent and distilled water according to the mass ratio of (10 to 12) to (1 to 2) to (3 to 6) to (1 to 2) to 200; and (3) soaking the polyphenylene sulfide filter material into the composite finishing liquid, drying and roasting the soaked polyphenylene sulfide filter material at high temperature to prepare the polyphenylene sulfide filter material of which the surface is coated with the polytetrafluoroethylene. Compared with the prior art, the method has the advantages that the filter material has little possibility of being oxidized and is good in corrosion resistance and film-forming property and adhesive force of the polytetrafluoroethylene, has the water resistance and oil resistance and can be widely used in the polyphenylene sulfide filter material in coal fired high-temperature flue gas.

Description

technical field [0001] The invention relates to the field of polyphenylene sulfide filter materials, in particular to a method for coating polytetrafluoroethylene on the surface of polyphenylene sulfide filter materials. Background technique [0002] Polyphenylene sulfide (PPS) filter material is easily absorbed by NO and O in the environment where coal-burning high-temperature flue gas is used 2 Oxidation degrades the PPS fiber amorphous area and partially crystalline area, reduces the strength of the fabric, and shortens the service life. Polytetrafluoroethylene (PTFE) is one of the materials with the best corrosion resistance, so PTFE is used to arrange the PPS filter material so that PTFE can play a certain anti-oxidation protection effect on the PPS filter material. The surface of PPS filter material is coated with PTFE. On the one hand, it can improve the filtration accuracy and efficiency of the filter material, improve the cleaning performance of the filter material...

Claims

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Application Information

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IPC IPC(8): D06M15/256D06M15/263D06M15/55D06M13/513D06M15/53D06M13/50D06M13/256D06M15/643B01D39/16D06M101/30
CPCD06M15/256B01D39/16B01D2239/0471D06M13/256D06M13/50D06M13/513D06M15/263D06M15/53D06M15/55D06M15/643D06M2101/30D06M2200/11D06M2200/12
Inventor 徐辉刘江峰周冠辰杨东
Owner ANHUI YUANCHEN ENVIRONMENTAL PROTECTION SCI & TECH
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