KR100975363B1 - Thermoplastic hollow fiber with excellent durability and fabric comprising the same - Google Patents

Abstract

The present invention relates to a thermoplastic hollow fiber having excellent durability and a fabric comprising the same, wherein the fluoropolymer is contained in the hollow fiber.

The thermoplastic hollow fiber of the present invention is produced by adding a fluoropolymer into the thermoplastic resin when spinning the thermoplastic resin to produce the thermoplastic hollow fiber.

The thermoplastic hollow fiber of the present invention is useful as a yarn for shoes, a yarn for furniture, a yarn for knapsack, an abrasive for yarn, a sportswear yarn and the like due to its excellent weight and durability against friction and deformation.

Hollow fiber, thermoplastic, durable, fluoropolymer, lightweight

Description

Thermoplastic hollow fiber with excellent durability and fabric comprising the same

1 and 2 is a cross-sectional view of the thermoplastic hollow fiber according to the present invention

* Explanation of symbols on the main parts of the drawings

1: hollow fiber A: thermoplastic resin

B: hollow part

The present invention relates to a thermoplastic hollow fiber having excellent durability and a fabric comprising the same, and more particularly, the present invention includes a thermoplastic hollow fiber having a fluoropolymer in the thermoplastic hollow fiber and having excellent durability against friction and deformation at the same time as lightweight. To fabric.

In order to strengthen the durability of thermoplastic fibers such as polyamide and polyethylene terephthalate, the following methods are basically used.

The first is to increase the molecular weight of the base resin of the thermoplastic fiber in the polymer polymerization step to increase the mechanical properties of the yarn itself.

The second is to raise the basic thickness of the thermoplastic fiber bundles in the spinning step of the yarn. That is, the thicker the yarn, i.e., the thicker the overall fineness, the lower the load on the load received per unit area. It is a common fact that 10 denier is stronger than 1 denier and 100 denier than 10 denier.

The third method is to increase the strength through the multi-stage stretching and heat treatment to give high orientation and high crystallization in the radially stretched state while satisfying one or all of the above two conditions by changing the stretching condition of the yarn.

There are two ways to increase the molecular weight of the base resin constituting the thermoplastic fiber in the polymerization step. In other words, the longer the polymerization time is, the longer the polymerization time is. However, this is basically limited in terms of time and efficiency. In the case of polyethylene terephthalate, the initial molecular weight increase rate is linearly related to time, but in the region of intrinsic viscosity of 0.6 or more, the tendency of molecular weight increase with time tends to be fairly gentle. That is, a problem arises that the molecular weight does not rise much compared to many polymerization times. In addition, side reactions occur and the molecular weight decreases due to a certain level of intrinsic viscosity.

In order to overcome this problem, polyethylene terephthalate is polymerized at an intrinsic viscosity of 0.5 to 0.7, and then passed through a solid-state polymerization dryer that can uniformly apply a high temperature of 150 ° C. or higher under vacuum to improve the crystallization of the polymer. This is commonly called solid-state polymerization and usually improves intrinsic viscosity to 1.0 to 1.3. This approach suffers from significant loss of time in the polymer polymerization process and in terms of yield and production cost. In particular, if the time and hot air are poorly controlled during the solid-state polymerization, it is difficult to apply it except for special applications because many additional problems such as entanglement of polyester and yellowing of yellow color change occur in polyamide materials. There is this.

Next, the method of securing the desired level of durability and wearability while increasing the total fineness of the yarn in the spinning step has a problem that can not increase the fineness of the fiber indefinitely depending on the application. For example, the standard weight of the fabric is 50 ~ 300g / m² when applied as a garment material. If it is less than that, the material of the yarn is too airy and difficult to weave / fabricate. It is limited in activity by weight. In particular, as the fineness rises, the softness and flexibility of the fabric itself decrease and become stiff. That is, the fiber has a limit of fineness depending on the use.

Next, as a method of reinforcing the strength of the yarn by changing the stretching conditions, a method of multistage stretching from two stages to three stages and four stages is widely used depending on the purpose without finishing the stretching at once. At this time, the strength increases with respect to the elongation reduction rate of the yarn according to the multi-stage stretching stage. At this time, it is effective to perform heat treatment in parallel to improve the strength.

However, the multi-stage heat treatment method has some limitations. In other words, after producing a woolen yarn and letting it pass for a certain period of time, it can be redrawn in a multistage drawing machine or can be produced in a multistep spinning machine immediately.However, the productivity is low due to the large equipment and low final drawing speed compared to the initial spinning speed. The process is difficult and the yield is low. In other words, it is not recommended in terms of productivity.

The durability improvement condition is a basic condition for weight reduction. However, commercial prerequisites for lightweighting are often required. If the durability is secured, it means that the lightness effect can be realized by using a material with a low fineness and a thin fineness, and the second case is to reduce the weight of the fabric while having the same shape.

Most of the cases belong to the latter, even if the weight is lowered, the apparent appearance should remain the same, and in many cases, the loss of fabric density and thickness due to the use of fine fiber is not acceptable.

The most suitable material for these conditions is the hollow fiber, and the apparent specific gravity of the yarn is lowered to 1.0 or less of the specific gravity of water according to the internal hollow ratio. In the case of a polyamide material, at least about 15% by weight, and in the case of a polyester material, at least 25% by weight should be achieved, the apparent specific gravity may be lowered to 1.0 or less, thereby achieving meaningful weight reduction. At this time, the internal hollow ratio is measured as the ratio of the total hollow area in the fiber cross-sectional area to the total fiber cross-sectional area.

In the case of hollow fibers, the condition for weight reduction lies in the internal hollow ratio. The higher the hollow ratio, the lighter the apparent weight, but the lower the strength and elongation of the yarn itself. In the case of the hollow fiber, the spinning draft generates 5-10 times higher spinning draft than that of the general circular cross section yarn. Therefore, both the strength and the elongation of the yarn itself are reduced, so that the conditions of polymerization, spinning and stretching mentioned above Even if it goes through, the durability is substantially reduced. The durability is quite low even at the same or light weight. This is because the deformation due to the cross-sectional effect and substantial excessive stretching is severe.

In the present invention, by solving a problem that is difficult to improve the light weight and durability of the conventional yarn at the same time, to provide a thermoplastic hollow island fiber and a fabric comprising the same at the same time excellent durability and lightness.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 to 2 is a cross-sectional view of the thermoplastic hollow fiber according to the present invention.

The thermoplastic hollow fiber of the present invention is a thermoplastic hollow fiber made of a thermoplastic resin and having a hollow portion formed on a yarn cross section, wherein the fluoropolymer is contained in the thermoplastic resin forming the hollow fiber. .

The fluoropolymer is one selected from the group consisting of polytetrafluoroethylene polymers, copolymers of tetrafluoroethylene and hexafluoropropene, copolymers of tetrafluoroethylene and perfluoroalkyl vinyl ether, and terpolymers thereof. .

Examples of the perfluoroalkyl vinyl ether are perfluoropropyl vinyl ether, perfluoroethyl vinyl ether and the like.

The fluoropolymer is contained in the thermoplastic resin constituting the hollow fiber and serves to lower the number of friction of the hollow fiber.

That is, when the fluoropolymer in the thermoplastic resin is located on the hollow fiber surface, the metal friction coefficient of the yarn is lowered to protect the hollow fiber itself.

The content of the fluoropolymer in the thermoplastic resin is preferably 0.1 to 9.0% by weight.

 When the content is less than 0.1% by weight, it is difficult to secure wear resistance and durability of the hollow fiber, and when it exceeds 9% by weight, more than the desired level of wear resistance and durability can be realized. Although it is necessary, the shaking of the apostle during the spinning becomes extremely severe because it is out of the above range, and even when the winding angle is adjusted on the winding drum, the apostle collapses and is very weak in fairness.

The average particle diameter of the fluoropolymer is preferably 0.01 to 5.0 µm, more preferably 0.1 to 1.0 µm, as measured by an optical microscope or an electron microscope. If it is less than 0.01 μm, it is difficult to overcome the mutual entanglement caused by the yield and ultra-fine diameter obtained by pulverizing the fluoropolymer, and if it exceeds 5.0 μm, the continuity of inorganic material in the production of hollow fiber with thermoplastic resin It is a weak point during spinning, which is a direct cause of cutting and fairness.

Although the hollow ratio of the hollow yarns varies depending on the type of the thermoplastic resin, a total level of 10-40% is sufficient. If it is lower than 10% of the above range, there is no substantial weight reduction effect, and if it is higher than 40%, even if the hollow is well formed, it tends to be easily collapsed by external force.

The present invention includes a fabric having the thermoplastic hollow fiber in which a fluoropolymer is contained in the thermoplastic resin. The thermoplastic hollow fiber content in the fabric is preferably 40 to 100% by weight.

Fabric according to the present invention is excellent in durability and light weight.

For example, in the case of polyester carpets requiring 2,000 abrasion resistance under ASTM-D 3884 conditions, 150 denier conventional polyester yarns make it difficult to obtain more than 1,400 abrasion resistance even if the carpet's structure and processing conditions are changed. . However, if the hollow fiber according to the present invention is used, even a 150 denier material can realize more than 2,000 wear resistances.

In addition, it can improve the level more than 500 times for the 75 denier material, which is 350 times the number of friction resistance, and the effect is doubled after the combustion process.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples.

 However, the present invention is not limited only to the following examples.

Example  One

Masterbatches containing 15% by weight of polytetrafluoroethylene having an average particle diameter of 0.5 占 퐉 as measured on an electron microscope using polyethylene terephthalate as a base polymer were prepared.

Using the masterbatch, a polyethylene terephthalate hollow fiber of 150 denier 48 filaments was prepared by a radial direct drawing method. At this time, the content of the masterbatch was adjusted so that the content of polytetrafluoroethylene in the hollow fiber was 1% by weight. At this time, the hollow ratio of the hollow fiber was 30%.

 After producing 88 copies by 4Kg drum, weaving it with 22 gauge interlock circular knitting machine, dyeing at 130 ℃ for 60 minutes, and drying at 180 ℃ hot air dryer at 30m / min to cut the circular knitting paper.

As a result of measuring the wear resistance of the manufactured circular knitting paper, it was 27 times.

Example  2

Masterbatches containing 15% by weight of polytetrafluoroethylene having an average particle diameter of 0.5 占 퐉 as measured on an electron microscope using polyethylene terephthalate as a base polymer were prepared.

Using the masterbatch, a polyethylene terephthalate hollow fiber of 150 denier 48 filaments was prepared by a radial direct drawing method. At this time, the content of the masterbatch was adjusted so that the content of polytetrafluoroethylene in the hollow fiber was 2% by weight. At this time, the hollow ratio of the hollow fiber was 30%.

 After producing 88 copies by 4Kg drum, weaving it with 22 gauge interlock circular knitting machine, dyeing at 130 ℃ for 60 minutes, and drying at 180 ℃ hot air dryer at 30m / min to cut the circular knitting paper.

As a result of measuring the wear resistance of the manufactured circular knitting paper, it was 32 times.

Comparative Example  One

The polyethylene terephthalate yarn of 150 denier / 48 filament having a hollow ratio of 0% was prepared by the radial direct drawing method using the polyethylene terephthalate of Example 1 containing no polytetrafluoroethylene.

Using the prepared polyethylene terephthalate yarn was cut into circular knitting paper under the same conditions as in Example 1.

As a result of measuring the wear resistance of the manufactured circular knitting paper, it was 12 times.

Comparative Example  2

The polyethylene terephthalate yarn of 120 denier / 48 filaments having a hollow ratio of 0% was prepared by the radial direct drawing method using the polyethylene terephthalate of Example 1 containing no polytetrafluoroethylene.

Using the prepared polyethylene terephthalate yarn was circular-cut processed paper under the same conditions as in Example 1.

As a result of measuring the wear resistance of the manufactured circular knitting paper, it was 19 times.

In Examples 1 to 2 and Comparative Examples 1 to 2, the number of wear-resistances of the circular knitted fabrics was set to ASTM-D3884's knitting test method, and an evaluation device was used as a Martindal wear resistance measuring instrument. The friction cloth used at this time was 320 Cw send paper, and a provision load was 500 g.

The thermoplastic hollow fiber of the present invention is excellent in light weight and durability and can be applied to various fields. For clothing, it can be commercialized for clothing by supplementing the durability and wear resistance of lightweight materials with low overall fineness.For non-clothing, it is used for protection wear materials such as shoes, furniture, motorcycles and horse riding clothes where strength and abrasion resistance are important. It can be applied to a wide range of materials, such as mountain climbing and mountain backpacks. Industrial applications can be applied to abrasive materials where surface friction characteristics are important.

Claims (7)

A thermoplastic hollow fiber made of a thermoplastic resin and having a hollow portion formed on a yarn cross-section, wherein the fluoropolymer is contained in the thermoplastic resin forming the hollow fiber. The thermoplastic hollow fiber having excellent durability according to claim 1, wherein the fluoropolymer content in the thermoplastic resin is 0.1 to 9.0% by weight. The thermoplastic hollow fiber having excellent durability according to claim 1, wherein the fluoropolymer has an average particle diameter of 0.01 to 5.0 µm. The thermoplastic hollow fiber having excellent durability according to claim 1, wherein the average particle diameter of the fluoropolymer is 0.1 to 1.0 mu m. The group according to claim 1, wherein the fluoropolymer is a group consisting of a polytetrafluoroethylene polymer, a copolymer of tetrafluoroethylene and hexafluoropropene, a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and a terpolymer thereof Durable thermoplastic hollow fiber, characterized in that one selected from. The thermoplastic hollow fiber having excellent durability according to claim 1, wherein the hollow ratio is 10 to 40%. Fabric comprising the thermoplastic hollow fiber of claim 1.

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