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A kind of preparation method of polytetrafluoroethylene film for air filtration

The technology of polytetrafluoroethylene and polytetrafluoroethylene micropowder is applied in the field of preparation of polytetrafluoroethylene film for air filtration, which can solve the problems of air permeability and filtration precision that need to be improved, and achieve good toughness, short cooling time, and high processing efficiency. low cost effect

Active Publication Date: 2016-08-17
ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Practice has proved that the air permeability and filtration accuracy of the film processed by the above process need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Auxiliaries include the first elastic glue and the second elastic glue mixed in a weight ratio of 1:1;

[0042] The first elastic glue comprises that the solid content of 10 parts by weight is 60% acrylic resin emulsion, 10 parts of water-based polyurethane, 3 parts of bamboo charcoal powder, the acrylic resin powder of 5 parts by weight, the EVA emulsion that the solid content of 2 parts by weight is 20% and 1 part by weight of chlorinated polypropylene;

[0043] Preparation of acrylic resin emulsion:

[0044] 4.63 parts of octylphenol polyoxyethylene ether (OP-10), 1.67 parts of sodium lauryl sulfate, and 0.6 parts of sodium bicarbonate were dissolved in 70 parts of deionized water, then added to the reaction kettle, and the temperature was raised to about 70°C; Take 1.3 parts of methyl methacrylate, 2.14 parts of styrene, 50.9 parts of butyl acrylate, 29.08 parts of isooctyl acrylate, 2.45 parts of butyl methacrylate, 1.8 parts of acrylonitrile, 0.8 parts of acrylic...

Embodiment 2

[0062] Auxiliaries include the first elastic glue and the second elastic glue mixed in a weight ratio of 3:1;

[0063] The first elastic glue comprises that the solid content of 35 parts by weight is 75% acrylic resin emulsion, 15 parts of aqueous polyurethane, 5 parts of bamboo charcoal powder, the acrylic resin powder of 8 parts by weight, the EVA emulsion that the solid content of 6 parts by weight is 35% and 4 parts by weight of chlorinated polypropylene;

[0064] Preparation of acrylic resin emulsion: 5.28 parts of sulfonated castor oil, 1.84 parts of sodium lauryl sulfate, and 0.66 parts of sodium bicarbonate were dissolved in 70 parts of deionized water, then added to the reaction kettle, and the temperature was raised to about 70°C; 6.12 parts of methyl methacrylate, 62.78 parts of butyl acrylate, 11.58 parts of styrene, 7.35 parts of butyl methacrylate, 0.88 parts of acrylic acid, 1.58 parts of methacrylic acid, and 8.7 parts of isooctyl acrylate are made into mixed m...

Embodiment 3

[0082] Auxiliaries include the first elastic glue and the second elastic glue mixed in a weight ratio of 2:1;

[0083] The first elastic glue comprises that the solid content of 25 parts by weight is 65% acrylic resin emulsion, 12 parts of water-based polyurethane, 6 parts of bamboo charcoal powder, the acrylic resin powder of 7 parts by weight, the EVA emulsion that the solid content of 5 parts by weight is 28% and 3 parts by weight of chlorinated polypropylene;

[0084] Preparation of acrylic resin emulsion: 4.5 parts of OP-10, 1.62 parts of sodium lauryl sulfate, 0.55 parts of sodium bicarbonate dissolved in 70 parts of deionized water, then added to the reaction kettle, heated to about 70 °C; weighed 5.42 Parts of methyl methacrylate, 54.79 parts of butyl acrylate, 10.11 parts of styrene, 6.55 parts of butyl methacrylate, 0.76 parts of acrylic acid, 1.41 parts of methacrylic acid, and 7.83 parts of isooctyl acrylate are used to make mixed monomers; / 3 parts of mixed mono...

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Abstract

The invention relates to a preparation method of a film, in particular to a preparation method of a PTFE (polytetrafluoroethylene) film for air filtration. The preparation method comprises steps as follows: lubricant mixing: mixing PTFE micro-powder with the aperture ranging from 0.215 micrometers to 0.225 micrometers with a liquid lubricant, and leaving the mixture to stand at the temperature of 85 DEG C-90 DEG C for 3-6 h to enable the resin powder and the liquid lubricant to be fully mixed so as to form a PTFE material, wherein the liquid lubricant comprises jet fuel and silicone oil, the additive amount of the jet fuel is 10-30% of the mass of the PTFE micro-powder, and the additive amount of the silicone oil is 1-10% of the mass of the PTFE micro-powder; blank formation and rolling; degreasing modification: adding an additive accounting for 1-3% of the mass of the PTFE micro-powder, and longitudinally stretching a PTFE base strip by 1.5-2.5 times at the temperature of 200 DEG C-250 DEG C to obtain a degreased base strip; stretching and setting: transversely stretching the degreased base strip at the temperature of 215 DEG C-235 DEG C, and then performing sintering and setting; cooling and curing. The PM2.5 interception effect of the PTFE film prepared with the method is good.

Description

technical field [0001] The invention relates to a method for preparing a film, in particular to a method for preparing a polytetrafluoroethylene film for air filtration. Background technique [0002] Membrane technology has been greatly developed in the past 40 years. Polytetrafluoroethylene (PTFE) film was first developed by Gore Company of the United States. It is composed of billions of continuous fibrils intertwined with each other. bright and clean. In addition, PTFE's chemical inertness and thermal stability broaden its application fields, whether it is placed in a harsh chemical environment, exposed to high temperature conditions, or requires biocompatibility and low chemical extractable occasions, porous PTFE membranes It can be regarded as an ideal material and is widely used in ultra-clean filter materials such as chemical industry, electronics, petroleum, instrumentation and so on. However, the linear expansion coefficient of PTFE material is relatively large. B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/18C08L33/08C08L75/04C08L23/08C08L23/28C08L51/00C08L25/14C08K9/04C08K9/02C08K3/04C08F220/18C08F212/08C08F291/06B29C69/02B29C55/14B01D71/36B01D67/00B01D46/54B29L7/00B29K27/18
CPCB01D67/0027B01D71/36B01D2323/08B01D2323/10B01D2323/28B29C35/16B29C43/24B29C55/14B29C67/04C08F212/08C08F220/18C08F220/1804C08F291/12C08J5/18C08J2327/18C08J2433/08C08L27/18C08L2203/16C08L2205/025C08L2205/035C08F220/10C08L33/08C08L75/04C08L23/0853C08L23/28C08L51/08C08L25/14C08K13/06C08K9/08C08K9/02C08K3/04C08F220/1808C08F212/10C08F220/44C08F220/14C08F220/06
Inventor 周宏成
Owner ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD