JP2008024796A - Composition having antifouling property and delamination resistance, porous polytetrafluoroethylene thin film to which the composition is bonded, fabric thereof and treatment method for imparting antifouling property and delamination resistance to the porous polytetrafluoroethylene thin film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antifouling, delamination-resistant composition, an antifouling, delamination-resistant, porous polytetrafluoroethuylene thin film, a fabric thereof, and a treatment method for imparting an antifouling property and a delamination resistance to the porous polytetrafluoroethylene thin film. <P>SOLUTION: The antifouling, delamination-resistant composition has characteristics such as hydrophobicity, lipophobicity and washability. The polytetrafluoroethuylene thin film is microporous and thus realizes functions such as gas permeability, moisture permeability and water repellency. In the treatment method, a finished product can be obtained by bonding the antifouling, delamination-resistant composition to the polytetrafluoroethuylene thin film through its application to the polytetrafluoroethuylene thin film or soaking of the polytetrafluoroethuylene thin film into the antifouling, delamination-resistant composition and baking the same. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a porous polytetrafluoroethylene thin film having a large number of micropores, and particularly refers to contamination resistance (referring to the property of preventing contamination) and anti-layer release property (property of preventing delamination between layers). ), A porous polytetrafluoroethylene thin film to which the composition is bonded, a fabric made from the thin film, and a processing method for stain resistance and anti-peeling property to the porous polytetrafluoroethylene thin film In connection with a porous polytetrafluoroethylene thin film having stain resistance and delamination resistance formed by a simple and rapid manufacturing method and its fabric, a composition having stain resistance and delamination resistance is applied. By processing or dipping to form a laminated or bonded porous polytetrafluoroethylene thin film and producing the finished product through an appropriate baking process, The structure of the porous polytetrafluoroethylene thin film that can maintain the porous properties of the film further provides the effects of breathability and moisture permeability, water repellency, oil repellency, stain resistance and water resistance, and binds to the fabric. And the whole process is simple and quick.

Conventional polytetrafluoroethylene is formed by polymerizing tetrafluoroethylene (C ₂ F ₄ ) and mainly contains no hydrogen in the composition of carbon atoms and fluorine atoms, so it does not react with oxygen. The characteristics include heat resistance, low temperature resistance, corrosion resistance, non-adhesiveness, low friction and self-lubricating properties, and the polytetrafluoroethylene is easily fused with other substances. In addition, since other materials do not easily stick, they are widely applied.

  Since polytetrafluoroethylene has various advantages as described above, a manufacturer processes it to produce a thin sheet or thin film of polytetrafluoroethylene, and then uses the porous properties to create a fabric. It is laminated on non-woven fabrics and applied to filter materials and other uses. For example, U.S. Pat. Nos. 5,234,739, 6,080,472, and 5,570,242, Taiwan Patent Publication No. 538164, and Publication No. 5,927,833.

  As can be seen from the above, processed polytetrafluoroethylene is widely applied to many industrial and consumer products, but there are various differences in the production process of polytetrafluoroethylene raw materials. For example, U.S. Pat. Nos. 6,702,971, 6,852,223, 5,098,625, 6,228,477, 6,401,0084, 6,676,993, 6,854,603, and There is 4096227.

  The production process described above and the product produced by this process are emphasized to be porous in the thin sheet or thin film of polytetrafluoroethylene obtained at the end, and are applied to textiles such as clothing. And the effect of air permeability, moisture permeability, and water repellency is emphasized.

  However, according to the above technique, the effects of stain resistance, oil repellency, and delamination are not taken into consideration, so there is a problem with oil contamination, which is the most difficult to treat as clothing contamination, and cleaning of dirt that has penetrated into the fabric. There is. The above-mentioned contamination is difficult to clean and must be cleaned with a special detergent, but this cleaning (cleaning) agent is irritating to the skin when in contact with the human skin for a long time. May cause damage.

Also, if only the surface of clothing (fabric) can be cleaned over a long period of time, the surface appears to be clean from the outside, but in fact it is not, especially emphasizing the breathability and moisture permeability functions If the clothing is to be worn, the dirt will permeate into the micropores of the clothing or accumulate over a long period of time, thereby blocking the micropores of the fabric and losing the original breathability and moisture permeability effects of the clothing. End up.
Not only that, but repeated cleaning over a long period of time causes a delamination phenomenon on the surface of the garment and the tissue of the fiber, losing the water repellent effect.

  In addition, there are a wide variety of methods and materials for forming stain resistant films such as US Pat. No. 6,420,804 and Taiwan Patent No. I232229. Surface treatment industry, construction industry, automobile industry (aluminum wheel and car body) It is applied to optical industry, precision machinery industry, information industry (DVD, CD and VCD), plastic and rubber products (tires), etc., and the contamination resistant thin film has the contamination resistance effect described in the patent. However, there is no effect of breathability and moisture permeability.

As can be seen from the above prior art, the thin film or finished product having the stain resistance function loses the function of ventilation and moisture permeability, and conversely, if it has the function of ventilation and moisture permeability, the contamination resistance and The anti-peeling function is lost.
Therefore, by combining the effects of each of the two types of thin films having the above-mentioned different characteristics, air permeability, moisture permeability, water repellency, oil repellency, and stain resistance are achieved, and anti-layer release properties are achieved. It is an urgent issue to have an effect, to simplify the production process, to improve the stability of the product, and to reduce the processing defect rate of the product.
US Pat. No. 5,234,739 US Pat. No. 6,080,472 US Pat. No. 5,750,242 Taiwan Patent Publication No. 538164 Taiwan Patent Publication No. 592783 US Pat. No. 6,702,971 US Pat. No. 6,852,223 US Pat. No. 5,098,625 US Pat. No. 6,228,477 US Patent No. 6410084 US Pat. No. 6,676,993 US Pat. No. 6,854,603 US Pat. No. 4,096,227 US Pat. No. 6,420,804 Taiwan Patent No. 12322229

  The main object of the present invention is to apply a composition having stain resistance and delamination properties having hydrophobic, oleophobic and water-washing properties, and a composition having the stain resistance and delamination properties. Thus, a porous polytetrafluoroethylene thin film having a breathability and moisture permeability, water repellency, oil repellency, stain resistance, delamination resistance, and water wash resistance and a woven fabric thereof are provided.

  Another object of the present invention is to provide not only air permeability, moisture permeability and water repellency, but also stain and oil repellency, delamination resistance, and water wash resistance, and can be used for textiles and clothes. Alternatively, when applied to objects that require the above effects, the porous polytetrafluoroethylene thin film having porous properties can be removed by simply wiping with clean water, and the anti-layer even when washed multiple times with water Porous polytetrafluoroethylene thin film having antifouling property and anti-peeling property capable of maintaining the effect of exfoliation and maintaining high air permeability and moisture permeability, water repellency, oil repellency, and antifouling effect And a woven fabric using the porous polytetrafluoroethylene thin film.

  In the present invention, a composition having stain resistance and delamination resistance is bonded to a porous polytetrafluoroethylene thin film by a coating process or a dipping process, and air permeability and moisture permeability are obtained through a baking process. It is a porous polytetrafluoroethylene thin film having a large number of micropores capable of realizing various functions such as water repellency, oil repellency, stain resistance, and anti-laminar property.

  The porous polytetrafluoroethylene thin film of the present invention has the inherent properties of the thin film and the effects of contamination, oil repellency, anti-layer release, The effect of washing resistance can be obtained, and it can also be applied to woven fabrics, non-woven fabrics, clothes, and other composites that require the above-described various effects.

  When the polytetrafluoroethylene thin film having porous properties is observed with a high magnification electron microscope, it consists of fibers and nodes. According to different temperatures and draw ratios, the fibers and nodes are clearly different and stretched at a larger magnification. For example, the existing fiber length is not stretched, and the nodes connecting the fibers are split again into finer fibers and smaller nodes. Is formed. When the thin film is widely applied to woven fabrics and clothes, the woven fabrics and garments can obtain effects of breathability, moisture permeability and water repellency.

  Therefore, the present invention mainly binds a porous polytetrafluoroethylene thin film having the above-described properties to the composition having antifouling property and anti-delaminating property of the present invention, and antifouling property and anti-delaminating property. Through the processing of the above, not only the effects of air permeability, moisture permeability and water repellency, but also the oil repellency, stain resistance and anti-peeling effect can be obtained, and excellent anti-stain and anti-peeling properties A porous polytetrafluoroethylene thin film and its woven fabric are provided, and mass production and reduction of defective products are realized by simplifying the process.

  The present invention relates to a stain-resistant and delamination-resistant composition, a stain-resistant and delaminating porous polytetrafluoroethylene thin film, its fabric, and a stain-resistant and anti-layer of a porous polytetrafluoroethylene thin film. Providing a releasable processing method, wherein the stain and delamination composition comprises a PU resin having 2-20% oleophobicity and a 2-20% hydrophobic compound injection; And the solvent is mixed by stirring for about 10 to 30 minutes. Further, the hydrophobic compound injection is a silicon or fluorine hydrophobic agent or a mixed preparation thereof. The solvent is butanone, toluene, acetone, water, dimethylformamide, or a mixed preparation thereof, and is appropriately proportional according to the oleophobic and hydrophobic characteristics of the antifouling and anti-peeling composition. Porous poly which can properly control the baking temperature and can be baked for 30 to 180 seconds at a temperature of 120 to 180 ° C. to obtain the effects of contamination resistance, oil repellency, anti-peeling property and washing resistance. A tetrafluoroethylene thin film is formed.

The main flow of the manufacturing process of the present invention will be described with reference to FIG.
The thin film 10 is baked 30 after performing the stain resistance and anti-delaminating treatment 20 to obtain a finished product 40. Further, the finished product 40 can be wound into a roller having a predetermined size between the baking 30 and the finished product 40 by the winding process 50.

Referring to FIGS. 1 and 2, the thin film 10 obtained by the above process is a general conventional continuous belt which is a porous polytetrafluoroethylene thin film, and the thin film 10 is next fed by a feeding device 10 ′. The process is sent to the above process, and the stain resistance and anti-delaminating treatment 20 is performed. The contamination resistance and anti-peeling treatment 20 is performed by the processing method of the application 21, and the application amount in a preset range is 6 to 20 g / m ² in the application equipment 21 ′. On the upper surface or lower surface layer of the porous polytetrafluoroethylene thin film 10 or both surfaces of the upper and lower surface layers, and for a predetermined time by the baking equipment 30 ′. In the range of 30 to 180 seconds, baking 30 is performed at a temperature of 120 to 180 ° C., and finally, the winding device 50 ′ is used for winding 50, a stain resistant and delamination porous polytetrafluoroethylene thin film, A finished product 40 of the fabric is obtained.

With reference to FIG. 1 and FIG. 3, another processing method of the present invention will be described.
The porous polytetrafluoroethylene thin film 10 is fed out by the feeding device 10 ′, and then subjected to the stain resistance and anti-peeling treatment 20. The contamination resistance and delamination treatment 20 is performed by the immersion processing method 22, and the immersion amount is set to 6 to 20 g / m ² in the preset range with the immersion equipment 22 ′. An anti-delaminating composition is firmly bonded in the porous polytetrafluoroethylene thin film 10. Further, baking 30 is performed at a temperature of 120 to 180 ° C. for a preset time in the range of 30 to 180 seconds by the baking equipment 30 ′, and finally the winding 50 and the stain resistance are taken up by the winding equipment 50 ′. And a delaminated porous polytetrafluoroethylene thin film and its finished fabric 40 are obtained.

    Further, the difference between the dipping equipment 22 ′ and the coating equipment 21 ′ is equipment in which the coating equipment 21 ′ uniformly applies the thin film 10 by controlling the amount of the composition having stain resistance and delamination resistance. Yes, the immersion equipment 22 'introduces the thin film 10 with a roller 221', and the thin film 10 is accommodated in the immersion tank 222 'with a press roller 223' in the immersion tank 222 '. It is immersed in the liquid of the composition which has property. Further, the composition having antifouling property and delamination property outside the predetermined fixed amount range is removed by the extrusion roller 224 ′, and the composition having antifouling property and antilayer delamination property is uniformly distributed. Then, it is fixed on the thin film 10.

Hereinafter, the processing control conditions of each process of a processing method are demonstrated about said processing method and equipment relation.
The thin film is a porous polytetrafluoroethylene thin film having a thickness of 0.02 to 0.04 mm.

The antifouling and anti-laminar properties of the thin film are 6 to 20 g / m ^{2 in} terms of the coating amount and the fixing amount of the composition having anti-contamination and anti-delaminating properties by applying and dipping processing methods. This is an operation for carrying out the stain resistance and anti-delaminating treatment so as to be in the range.

  Baking is performed by baking the above-described thin film treated with anti-stain and anti-laminar properties at a temperature of 120 to 180 ° C. in a time range of 30 to 180 seconds, thereby precipitating excess moisture and solvent. .

  The finished product is a porous polytetrafluoroethylene thin film having a stain resistance and an anti-laminar property having a thickness of 0.03 to 0.06 mm obtained by performing the above-described processing, and its fabric. is there.

  The porous polytetrafluoroethylene thin film having the stain resistance and delamination property after the processing and the finished product 40 of the fabric are the original breathability, moisture permeability and repellency of the porous polytetrafluoroethylene thin film. In addition to the water-based effect, the addition of stain resistance and oil repellency, anti-peeling properties and water-washing properties makes it applicable to various textile and clothing products.

FIGS. 4 and 5 are photomicrographs of the thin film 10 according to the present invention before the stain resistance and anti-laminar peel processing and after the stain resistance and anti-layer delamination processing.
As can be seen from the photograph, the thin film 10 of FIG. 4 is a porous polytetrafluoroethylene thin film of nodes and fibers prior to the stain and delamination processing. ,
FIG. 5 is a stain resistant and delamination-resistant porous polytetrafluoroethylene thin film and its finished fabric 40 after processing, and as can be seen from the photograph, the finished product No. 40 is applied and fixed to a fiber and a node with a composition having stain resistance and delamination property, and not only has a porous property before processing of stain resistance and delamination property, that is, breathability and In addition to having moisture permeability and water repellency characteristics, the effects of stain resistance and oil repellency, delamination resistance and water washing resistance are obtained, and the function of the product is improved.

As shown in FIG. 6, a composition having stain resistance and anti-peeling property with a coating amount and a fixing amount in a range of 6 to ²⁰ g / m ² set in advance by a processing process of coating 21 and dipping 22. It is applied or fixed to either the intermediate layer, the upper surface or the lower surface layer of the porous polytetrafluoroethylene thin film 10, or is applied or fixed to the upper or lower surface layer, and the stain resistance and delamination property are improved. By uniformly applying and fixing the composition having the porous polytetrafluoroethylene thin film 10 to the porous polytetrafluoroethylene thin film 10, a porous polytetrafluoroethylene thin film having antifouling property and delamination property and a finished product 40 of the fabric are formed. Is done. As can be seen from the side view, a coated surface 41 is formed on the surface of the finished product 40, and an intermediate layer to which a composition having antifouling property and delamination property is applied and fixed is PTFE (polytetrafluoroethylene). The surface 42 is a porous polytetrafluoroethylene thin film, and a fabric is bonded to the intermediate layer by primary processing or secondary processing. This is the fabric surface 43 of the bottom layer.

FIG. 7 shows a stain-resistant and delamination-processed porous polytetrafluoroethylene thin film having a stain-resistance and anti-layer delamination processing according to the present invention, and a finished product 40 (Sample C10) thereof. It is a comparison table | surface of the sampling test data with the thin film 10 which is not stain-resistant and delamination-proof processed.
According to the oil repellency test, the above effect is not obtained in the thin film 10 which has not been subjected to the stain resistance and anti-peeling property processing.
On the other hand, a porous polytetrafluoroethylene thin film having a stain resistance and an anti-delaminating property processed according to the present invention, and a finished product 40 of the woven fabric, have an air permeability, a moisture permeability, According to the water repellency test and the oil repellency drip test, not only is it within the allowable range, and not only the effects of breathability and moisture permeability, water repellency and oil repellency are obtained, but also the overall property of stain resistance is obtained. It is done.

FIG. 8 shows the stain resistance and delamination property of the porous polytetrafluoroethylene thin film having the stain resistance and delamination property processed according to the present invention and the finished product 40 of the fabric. It is a table | surface which shows the test data of sampling of delamination property.
As can be seen from the data in this table, even though the thicknesses are different (see the thickness field of the data), the values of water resistance and water pressure resistance that have not been subjected to a water wash test, and after 5X, 15X, 25X water wash Water wash resistance and water pressure resistance values (see, for example, the water resistance field of the data) are interspersed with numbers between 5000 and 15000, and are therefore in a high standard state.
The data standard for this test is obtained by the AATCC-135 water-washing resistance test and the JIS-L1092: 1998-6.1- (A) water-pressure resistance test.

  The test method for measuring each numerical value is not limited to the numerical value according to the present invention, and the numerical value obtained by converting the numerical value measured by any other method into the test method used in the invention is the numerical value of the present invention. Methods intervening within the scope are also included within the scope of the claims relating to the present invention.

  According to the above description, the porous polytetrafluoroethylene thin film of the present invention has the inherent properties of the thin film and the anti-contamination property while maintaining the air permeability, moisture permeability and water repellency due to the characteristics. The effects of oil repellency, delamination resistance and water washing resistance can be obtained, and it can also be applied to woven fabrics, non-woven fabrics, clothes or other composites requiring the above-mentioned various effects.

  According to the above description, the finished product 40 having the effects of stain resistance and oil repellency, anti-peeling property and water washing resistance according to the present invention is not only stain resistant but also the ordinary product adhered to the finished product 40. The dirt can be easily removed by simply wiping with clean water, and even when very difficult to treat oil adheres, according to the dripping test, the oil liquid aggregates in a ball shape and stays on the surface of the finished product 40. As a result, the oil-repellent effect can be obtained, and the oil droplets can be removed with a paper or cloth having a general absorbency, and if an ordinary oily scale adheres, wipe it with a wet cloth. Just remove it. As for the delamination property, even if the finished product 40 is washed with water several times, the composition having stain resistance and delamination property is not in the state of delamination, and normal breathability, moisture permeability, and water repellency. The effects of oil repellency, stain resistance and delamination are maintained.

The flowchart of the Example of this invention. The flowchart of the installation of 1st Example of this invention. The flowchart of the installation of 2nd Example of this invention. FIG. 3 is a micrograph of a porous polytetrafluoroethylene thin film structure that has not been subjected to stain resistance and anti-delaminability processing. FIG. 3 is a micrograph of a porous polytetrafluoroethylene thin film structure that has been subjected to a stain resistance and anti-laminar property processing according to the present invention. The microphotograph figure of the side surface of the porous polytetrafluoroethylene thin film by which the stain resistance and the delamination property processing which concern on this invention were processed, and its textile fabric. The porous polytetrafluoroethylene thin film treated with the stain resistance and anti-peeling property according to the present invention and the porous polytetrafluoroethylene thin film not treated with the stain resistance and anti-peeling property are subjected to ventilation, moisture permeability, and repellency. Data comparison table of water and oil repellency tests. Test data of water resistance test of porous polytetrafluoroethylene thin film treated with stain resistance and anti-peeling property and porous polytetrafluoroethylene thin film not treated with stain resistance and anti-peeling property according to the present invention FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Thin film 10 'Feeding device 20 Antifouling property and delamination processing 21 Application | coating 21' Application equipment 22 Immersion 22 'Immersion equipment 30 Baking 30' Baking equipment 40 Finished product 41 Application surface 42 PTFE surface 43 Textile surface 50 Winding 50 'Winding equipment 221' Roller 222 'Immersion tank 223' Presser roller 224 'Extruding roller

Claims (13)

  Contamination resistance and anti-laminar separation characterized by comprising 2% to 20% PU resin having oleophobicity, 2% to 20% hydrophobic compound injection and solvent mixed in a stirring step A composition having properties.   The composition having antifouling property and delamination property according to claim 1, wherein the hydrophobic compound injection is silicon or a fluorine hydrophobic agent, or a mixed preparation thereof.   The composition having antifouling property and delamination property according to claim 1, wherein the solvent is butanone, toluene, acetone, water, dimethylformamide, or a mixed preparation thereof. An upper surface layer of a porous polytetrafluoroethylene thin film is coated with a composition having stain resistance and anti-layer release property so that the coating amount in a preset range is 6 to 20 g / m ² by a coating process. It is applied to the lower surface layer, or the upper and lower surface layers, or by a dipping process, so that the fixed amount in a preset range is 6 to 20 g / m ² , so that the stain resistance and the delamination property are The composition having the above composition is firmly bonded to the intermediate layer of the porous polytetrafluoroethylene thin film, and the composition having the stain resistance and delamination property is uniformly applied or fixed to the porous polytetrafluoroethylene thin film. A porous polytetrafluoroethylene thin film having anti-contamination and anti-laminar properties, and a woven fabric thereof.   The composition having stain resistance and delamination property comprises a PU resin having 2% to 20% oleophobicity, 2% to 20% hydrophobic compound agent and solvent, and the hydrophobic compound injection The agent is a silicon or fluorine hydrophobic agent or a mixed preparation thereof, and the solvent is butanone, toluene, acetone, water, dimethylformamide, or a mixed preparation thereof. A porous polytetrafluoroethylene thin film having anti-peeling property and its woven fabric.   The porous polytetrafluoroethylene thin film is subjected to contamination resistance and delamination treatment while being fed out by a feeding device, and is baked in a baking facility, and the contamination resistance to the porous polytetrafluoroethylene thin film is characterized by Anti-peeling processing method.   The porous polytetrafluoroethylene thin film according to claim 6, wherein the finished product is wound up into a roller having a predetermined size by a winding process between baking and the finished product. Anti-peeling processing method. The contamination resistance and delamination treatment are carried out by a coating method, and the contamination resistance and delamination are such that the coating amount, which is a preset range in the coating equipment, is 6 to 20 g / m ^2. The composition having the property is applied to either the upper surface layer or the lower surface layer of the porous polytetrafluoroethylene thin film, or both the upper surface layer and the lower surface layer. Baking processing is performed at a temperature of 130 to 180 ° C. so that it is ˜180 sec. Processing for stain resistance and delamination of porous polytetrafluoroethylene thin film according to claim 6 Processing method. The stain resistance and delamination property treatment is performed by a dipping process method, and has stain resistance and delamination property so as to be 6 to ²⁰ g / m ² which is a range set in advance by dipping equipment. The composition is fixedly bonded to the intermediate layer of the porous polytetrafluoroethylene thin film, and the temperature is 130 to 180 ° C. so that the time in the preset range is 30 to 180 sec. Baking processing is performed, The processing method of the stain resistance and the delamination property to the porous polytetrafluoroethylene thin film of Claim 6 characterized by the above-mentioned.   9. The porous polytetrafluoroethylene thin film according to claim 8, wherein the coating equipment uniformly coats the thin film by controlling the amount of the composition having stain resistance and delamination property. Contamination resistance and delamination processing method.   The dipping equipment is composed of a roller, a dipping tank, a pressing roller and an extrusion roller, a thin film is introduced with the roller, and the thin film is dipped into the dipping tank with a pressing roller in the dipping tank and has a composition having antifouling property and anti-layer peeling property A composition having antifouling properties and delaminating properties other than a predetermined fixing amount range is removed by pressing under the liquid level of the object and an extruding roller, and has the antifouling properties and antilaminating properties. 10. The method for processing stain resistance and delamination to a porous polytetrafluoroethylene thin film according to claim 9, wherein the composition is uniformly distributed and fixed on the thin film. The thin film is a porous polytetrafluoroethylene thin film having a thickness of 0.02 to 0.04 mm,
Contamination resistance and anti-peeling treatment are performed on the above-mentioned thin film by a coating process or a dipping process, so that the composition having anti-stain and anti-peeling properties is applied in an amount of 6 to ²⁰ g / m ² and fixed. It is an operation to perform the stain resistance and anti-delaminating treatment as the amount,
The baking process deposits excess moisture and solvent by baking the above-mentioned antifouling and delamination-treated thin film by controlling the temperature at 120 to 180 ° C. in a time range of 30 to 180 sec. Process
The finished product obtained by performing the above processing is a porous polytetrafluoroethylene thin film having a stain resistance and an anti-laminar peelability having a thickness of 0.03 to 0.06 mm.
The processing method of the stain resistance and the delamination property to the porous polytetrafluoroethylene thin film of Claim 6 characterized by the above-mentioned.   The composition having stain resistance and delamination property is obtained by stirring and mixing a PU resin having 2% to 20% oleophobicity, a 2% to 20% hydrophobic compound injection and a solvent. The formed hydrophobic compound injection is silicon or fluorine hydrophobic agent or a mixed preparation thereof, and the solvent is butanone, toluene, acetone, water, dimethylformamide or a mixed preparation thereof. The processing method of the stain | pollution resistance and delamination property to the porous polytetrafluoroethylene thin film as described in any one of 8 thru | or 12.