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Polytetrafluoroethylene film for filtering air

The technology of polytetrafluoroethylene and polytetrafluoroethylene micropowder is applied in the field of film preparation, which can solve the problems of air permeability and filtration precision to be improved, and achieve the effects of good toughness, good interception effect and good effect.

Active Publication Date: 2015-04-08
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

[0047] Auxiliaries include the first elastic glue and the second elastic glue mixed in a weight ratio of 1:1;

[0048] 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;

[0049] Preparation of acrylic resin emulsion:

[0050] 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

[0068] Auxiliaries include the first elastic glue and the second elastic glue mixed in a weight ratio of 3:1;

[0069] 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;

[0070] 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

[0088] Auxiliaries include the first elastic glue and the second elastic glue mixed in a weight ratio of 2:1;

[0089] 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;

[0090] 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, and particularly relates to a polytetrafluoroethylene film for filtering air. According to the film, the thickness is 15-20nm, the air permeability is 100-120L / m<2> / s; and the filtering accuracy is over 99.99%. The preparation method comprises the following steps: lubricating and mixing, namely mixing PTFE micropowder with a liquid lubricating agent, and standing at 85-90 DEG C for 3-6 hours, so as to form a PTFE material, wherein the liquid lubricating agent comprises aviation kerosene and silicon oil; the adding amount of the aviation kerosene is 10%-30% of mass of the PTFE powder; and the adding amount of the silicon oil is 1-10% of mass of the PTFE powder; forming a blank, and rolling; degreasing and modifying, namely adding an assistant which accounts for 1%-3% of mass of the PTFE powder; longitudinally stretching a PTFE base band for 1.5-2.5 times at 200-250 DEG C, and then forming a degreasing base band, wherein the assistant comprises first elastic rubber and second elastic rubber, which are mixed at the mass ratio of (1-3) to 1; and stretching and sizing, namely transversely stretching the degreasing base band at 215-235 DEG C, sintering, sizing, cooling and solidifying. The PM2.5 intercepting effect of the PTFE film disclosed by the invention is good.

Description

technical field [0001] The invention relates to a preparation method of a film, in particular to 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. Between -50°C and 250°C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/18C08L33/08C08L75/04C08L23/08C08L23/28C08L51/00C08L25/14C08K9/04C08K9/02C08K3/04C08F220/18C08F212/08C08F291/06B29C69/02B29C55/14B01D71/36B01D67/00B01D46/54
CPCB01D46/543B01D67/0002B01D71/36C08F212/08C08F220/18C08F220/1804C08F291/12C08K2201/011C08L27/18C08L2203/16C08L2205/035C08L91/00C08L83/04C08L75/04C08L23/0853C08L23/28C08L89/00C08L93/04C08L51/00C08L33/08C08L25/14C08K9/04C08K9/02C08K9/00C08K3/04C08K2003/0806C08F220/14C08F220/06C08F220/1808
Inventor 周宏成
Owner ZHEJIANG LUCKING ENVIRONMENTAL PROTECTION CO LTD
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