TW201506067A - Multi-layered cloth and method of manufacturing the same - Google Patents

Abstract

Disclosed is a multi-layered cloth, including a breathable and waterproof membrane and a cloth. The breathable and waterproof membrane includes a PTFE film and a plurality of PE chains, wherein a main chain of the PE chains are rooted in the PTFE film, and terminals of the PE chains expose on a surface of the PTFE film without aggregation. The breathable and waterproof membrane and a cloth are adhered by the terminals of the PE chains.

Description

Multilayer cloth and its forming method

The present invention relates to a multilayered cloth comprising a breathable waterproofing film, and more particularly to a method of forming the same.

Polytetrafluoroethylene (PTFE) is a synthetic polymer material of all hydrogen atoms in fluorine-substituted polyethylene (PE). This material is resistant to acids, alkalis, and various organic solvents and is almost insoluble in all solvents. At the same time, PTFE has the characteristics of high temperature resistance, its friction coefficient is extremely low, so it can be used for lubrication, and it is also an ideal coating for the inner layer of non-stick pan and water pipe. In fabric applications, PTFE is waterproof and breathable. In general, if the PTFE film is to be attached to the fabric, it is usually necessary to adhere the PTFE film and the cloth by means of dispensing or topping. If the density of the dispensing is too low, the PTFE film is easily peeled off from the fabric. If the density of the dispensing is too high (or a face glue), it will affect the air permeability of the PTFE film. In addition, after the gel is formed on the PTFE film, it needs to be processed in a short time to avoid the hardening of the gel and lose the adhesive property. In other words, the PTFE layer and the gel are stored separately before processing and are bonded together during processing. In this way, even if the same PTFE film and gel are used, it is impossible to ensure uniform quality of the PTFE film/glue/cloth formed per process due to the difference in processing parameters.

In summary, there is a need for new ways to bond PTFE film and fabric.

An embodiment of the present invention provides a method for forming a multilayered cloth, comprising: mixing a polytetrafluoroethylene powder, an ethylene monomer, a kerosene, and forming a viscous mixture with a Ziegler-Natta catalyst; forming a film by pressing the mixture with three rollers; heating The surface of the film causes the ethylene monomer to polymerize under the action of the Ziegler-Natta catalyst to form a plurality of chain-like polyethylene, and the main chain of the chain-like polyethylene and the polytetrafluoroethylene are embedded with each other, wherein the chain is The end of the polyethylene protrudes from the surface of the film and is gathered into a block; an irregular local source energy is applied to the surface of the film to break the end of the polyethylene of the aggregated block; the end of the broken polyethylene is heated, It is melted into a glue and then thermocompression bonded to the cloth.

Another embodiment of the present invention provides a multilayered cloth comprising: a gas permeable waterproof film comprising: film-like polytetrafluoroethylene; and a plurality of chain-like polyethylenes, wherein a chain-like polyethylene main chain is embedded in a film shape In the PTFE, and the end of the chain-like polyethylene is exposed to the surface of the film-like polytetrafluoroethylene and is not aggregated, and the cloth, wherein the end of the chain and the breathable waterproof film are chain-like polyethylene Bonding.

10‧‧‧film

11‧‧‧Chain-like polyethylene

11A‧‧‧End of polyethylene chain

11B‧‧‧ Chain-shaped polyethylene main chain

11C‧‧‧End of chained polyethylene

13‧‧‧ Film-like PTFE

15‧‧‧ hot air

17‧‧‧Roller

19, 19’‧‧‧ cloth

21‧‧‧ Energy

100‧‧‧ breathable waterproof film

1, 2, 4, and 5 are cross-sectional views showing a process for forming a gas permeable waterproof film in an embodiment of the present invention.

Fig. 3 is a top view corresponding to Fig. 2.

Fig. 6 is a top view corresponding to Fig. 5.

7 to 9 are cross-sectional views showing a process for forming a gas permeable waterproof film in an embodiment of the present invention.

10 to 11 are cross-sectional views showing the formation of a multilayered cloth in an embodiment of the present invention.

As shown in Fig. 1, an embodiment of the present invention mixes PTFE (polytetrafluoroethylene) powder, ethylene monomer, kerosene, and Ziegler-Natta catalyst to form a viscous mixture, and then presses the mixture into a film via three rollers. 10. . In an embodiment of the present invention, a main catalyst for the Ziegler-Natta catalyst TiCl _4, the sub-catalyst is triethylaluminum.

Next, as shown in Fig. 2, the upper surface of the film 10 is heated to move the kerosene remaining in the film 10 toward the upper surface of the film 10, and the ethylene monomer is moved toward the upper surface of the film. During the heating process, the ethylene monomer blended in the PTFE powder is subjected to in-situ polymerization under the action of a Ziegler-Natta catalyst to form a chain-like polyethylene 11 in the film-like PTFE 13. Since the kerosene drives the ethylene monomer to move toward the upper surface of the film, the end of the chain-like polyethylene 11 is solid-phase separated from the film-like PTFE 13. The end of the chain-like polyethylene 11 will expose the surface of the film-like PTFE 13 and be aggregated into the block 11A, and the main chain 11B of the chain-like polyethylene 11 will be embedded in the film-like PTFE 13. Figure 3 is a top view of the structure of Figure 2. As can be seen from Fig. 3, on the surface of the film-like PTFE 13, the chain-like polyethylene terminal agglomerates 11A are arranged irregularly. The temperature at which the heating film 10 separates the end of the polyethylene 11 from the film-like PTFE 13 solid phase is between about 125 ° C and 140 ° C. If the heating temperature is too low, the end of the polyethylene cannot be phase separated from the PTFE. If the heating temperature is too high, the chain-like polyethylene ends are excessively aggregated into the block 11A to an excessive extent.

Next, as shown in Fig. 4, local light source energy 21 of irregularity (e.g., irregular point) is applied to the upper surface of the film-like PTFE 13. At this time, the chain-like polyethylene end on the upper surface of the film-like PTFE 13 is aggregated into the block 11A, and is broken by the irregular local light source energy 21 to form the end 11C of the polyethylene, as shown in Fig. 5. Show. It is to be noted that if light source energy is applied to all surfaces of the film-like PTFE 13, it is possible to cleave the end 11C of all the chain-like polyethylenes 11. This will prevent the chain-like polyethylene from exposing the upper surface of the film-like PTFE 13. On the other hand, if the irregular local light source energy 21 is not applied to the upper surface of the film-like PTFE 13, the chain-like polyethylene end aggregates into the block 11A, and the film-like PTFE 13 loses the gas permeable property.

Figure 6 is a top view of the structure of Figure 5. As can be seen from Fig. 6, on the surface of the film-like PTFE 13, the end portions 11C of the chain-like polyethylene are irregularly arranged. The polyethylene and PTFE in the waterproof gas permeable film 100 can coexist for a long time without causing delaminate problems after the double-layer structure of polyethylene/PTFE is stored for a short period of time.

Although in the above embodiment, the end portion 11C of the chain-like polyethylene appears only on the upper surface of the film-like PTFE 13, it may also appear on the lower surface of the film-like PTFE 13. As shown in Fig. 7, the upper and lower surfaces of the film 10 are heated to move the ethylene monomer toward the upper and lower surfaces of the film 10. At the same time, the Ziegler-Natta catalyst in the film 10 and the ethylene monomer will be polymerized in situ to form a chain-like polyethylene 11. The end of the chain-like polyethylene 11 is separated from the film-like PTFE 13 phase. The end of the chain-like polyethylene 11 will expose the surface of the film-like PTFE 13 and be aggregated into the block 11A, and the main chain 11B of the chain-like polyethylene 11 will be embedded in the film-like PTFE 13.

Next, as shown in Fig. 8, local light source energy 21 of irregularity (e.g., irregular timing) is applied to the upper and lower surfaces of the film-like PTFE 13. At this time, the upper surface of the film-like polytetrafluoroethylene 13 and the chain-like polyethylene end on the lower surface are aggregated into the block 11A, and are broken by the irregular local energy 21 to form the polyethylene end 11C, as shown in Fig. 9. Shows that surface hot melt properties are formed.

Then, as shown in Fig. 10, the hot air 15 is applied to the ventilation of the fifth figure. The upper surface of the water film 100 is such that the polyethylene end 11C is melted into a glue. In one embodiment, the temperature of the hot air 15 is between 480 ° C and 590 ° C, and the time during which the hot air 15 is applied is between 1 and 2 seconds. If the temperature of the hot air 15 is too high and/or the time during which the hot air 15 is applied is too long, the texture of the bonding cloth will become hard. If the temperature of the hot air 15 is too low and/or the time during which the hot air 15 is applied is too short, the polyethylene end 11C cannot be melted into a glue. In other embodiments of the present invention, other methods may be substituted for the hot air 15, such as a microwave or the like. Next, the cloth 19 is thermally pressed together with the air-permeable waterproof film 100 to which the hot air 15 is applied by the double roller 17, thereby forming a double-layer cloth. In an embodiment of the invention, the temperature of the drum 17 is between 110 ° C and 180 ° C, the spacing between the rollers 17 is between 0.02 mm and 0.04 mm, and the rotational speed of the drum 17 is between 6 m / s and 8 m / Between s. If the temperature of the drum 17 is too high, the pitch is too small, and/or the number of revolutions is too slow, problems such as excessive hand feeling may occur. If the temperature of the drum 17 is too low, the pitch is too large, and/or the rotational speed is too fast, there may be a problem that the sticking is not strong. In an embodiment of the invention, the cloth 19 comprises a knitted fabric, a staple fiber woven fabric, or a long-fiber flat woven fabric. For example, the double-layered fabric after thermocompression bonding may be a short-fiber woven fabric/PTFE film, a knitted fabric/PTFE film, or a long-fiber plain woven fabric/PTFE film, and the film 19 and the PTFE film are melted together. The polyethylene end 11C of the glue is bonded.

As shown in Fig. 11, the upper surface and the lower surface of the breathable waterproof film 100 of the hot air 15 to Fig. 9 are applied to melt the polyethylene end 11C into a glue. In one embodiment, the temperature of the hot air 15 is between 480 ° C and 590 ° C, and the time during which the hot air 15 is applied is between 1 and 2 seconds. If the temperature of the hot air 15 is too high and/or the time during which the hot air 15 is applied is too long, the texture of the bonding cloth will become hard. If the temperature of the hot air 15 is too low and/or the time during which the hot air 15 is applied is too short, the polyethylene end 11C cannot be melted into a glue. In other embodiments of the present invention, other methods may be substituted for the hot air 15, such as a microwave or the like. Then, the cloth 19 and the breathable waterproof film after the hot air 15 is applied by the double roller 17 100. Combine with the fabric 19' to form a three-layer fabric. In an embodiment of the invention, the temperature of the drum 17 is between 110 ° C and 180 ° C, the spacing between the rollers 17 is between 0.02 mm and 0.04 mm, and the rotational speed of the drum 17 is between 6 m / s and 8 m / Between s. If the temperature of the drum 17 is too high, the pitch is too small, and/or the number of revolutions is too slow, problems such as excessive hand feeling may occur. If the temperature of the drum 17 is too low, the pitch is too large, and/or the rotational speed is too fast, there may be a problem that the sticking is not strong. In an embodiment of the invention, the fabrics 19 and 19' each comprise a knitted fabric, a staple woven fabric, or a long-fiber flat woven fabric. For example, the three-layer fabric after thermocompression can be staple fiber woven fabric / PTFE film / knitted fabric, knitted fabric / PTFE film / knitted fabric, long-fiber plain woven fabric / PTFE film / knitted fabric, or other three The cloth is layered, and the cloth 19 (and 19') and the PTFE film are bonded together by a melt-bonded polyethylene end 11C.

15‧‧‧ hot air

17‧‧‧Roller

19, 19’‧‧‧ cloth

100‧‧‧ breathable waterproof film

Claims (8)

A method for forming a multilayer cloth comprising: mixing a polytetrafluoroethylene powder, an ethylene monomer, a kerosene, and forming a viscous mixture with a Ziegler-Natta catalyst; pressing the mixture with three rollers to form a film; heating the film a surface, the ethylene monomer is polymerized under the action of a Ziegler-Natta catalyst to form a plurality of chain-like polyethylene, and the chain of the chain-like polyethylene and the polytetrafluoroethylene are embedded with each other, wherein the An end of the chain of polyethylene protrudes from the surface of the film and aggregates into a block; applying irregular local source energy to the surface of the film to fracture the ends of the polyethylene of the aggregated block; The end of the broken polyethylene is heated, melted into a glue, and then thermocompression bonded to a cloth. The method of forming a multilayered cloth according to claim 1, wherein the temperature of the upper surface of the film is heated to be between 125 ° C and 140 ° C. The method for forming a multilayered cloth according to claim 1, wherein the temperature of the heat-fragmented polyethylene end is between 480 ° C and 590 ° C. The method of forming a multi-layer fabric according to claim 1, wherein the fabric comprises a knitted fabric, a staple fiber woven fabric, or a long-fiber flat woven fabric. The method for forming a multilayered cloth according to claim 1, wherein the fragmented polyethylene ends on the surface of the film-like polytetrafluoroethylene are irregularly arranged. A multi-layer cloth comprising: a breathable waterproof film comprising: a film-like polytetrafluoroethylene; and a plurality of chain-like polyethylenes, wherein a main chain of the chain-like polyethylene is embedded in the film-like polytetrafluoroethylene, and the chain-like polyethylene The end of the film is exposed to the surface of the film-like polytetrafluoroethylene and is not aggregated, and a cloth, wherein the cloth and the gas permeable waterproof film are bonded at the ends of the chain-like polyethylene. The multi-layer fabric of claim 6, wherein the fabric comprises a knitted fabric, a staple fiber woven fabric, or a long-fiber flat woven fabric. The multi-layer fabric of claim 6, wherein the chain-like polyethylene ends on the surface of the film-like polytetrafluoroethylene are irregularly arranged.