KR20080078967A - Thermoplastic fiber with excellent durability and fabric comprising the same - Google Patents

Abstract

A thermoplastic fiber with the excellent durability and a fabric comprising the same are provided to manufacture the thermoplastic fiber having excellent durability by increasing the base unit of the fiber without lowering the productivity and the generation of the process defect. A thermoplastic fiber is formed of a thermoplastic resin containing fluoro-polymer. The fineness of the single yarn of the thermoplastic fiber for having excellent durability is 20 denier or less. The content of the fluoro-polymer in the thermoplastic resin is 0.1-9.0 weight%. The diameter of the average particle of the fluoro-polymer is 0.1-1.0mum. The fluoro-polymer is formed of one selected from a group consisting of a polytetrafluoroethylene polymer, a polymer formed of tetrafluoroethylene and hexafluoropropene, a polymer formed of tetrafluoroethylene and perfluoroalkylvinylether, and a polymer formed of three elements from listed elements. The thermoplastic fiber is used as a yarn for shoes, a yarn for furniture, a yarn for knapsack, and yarn for sports wear, and so on.

Description

Thermoplastic fiber with excellent durability and fabric comprising the same

The present invention relates to a thermoplastic fiber having excellent durability and a fabric comprising the same. More particularly, the present invention relates to a thermoplastic fiber having a fluoropolymer in the thermoplastic resin constituting the fiber and having excellent durability against friction and deformation, and a fabric including the same. It is about.

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 total 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 to improve 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, there are many additional problems such as entanglement of polyester with yellow and yellowing of yellow with polyamide. There is a difficult problem.

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.

In the present invention, by solving a problem that is difficult to improve the durability of the conventional yarn, to provide a durable thermoplastic fiber and a fabric comprising the same.

EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

The thermoplastic fiber of the present invention is characterized in that the fluoropolymer is contained in the thermoplastic resin in the thermoplastic fiber made of the thermoplastic resin.

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 fiber and serves to lower the number of friction of the fiber.

That is, when the fluoropolymer in the thermoplastic resin is located on the fiber surface, the metal friction coefficient of the yarn is lowered to protect the thermoplastic 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 the wear resistance and durability of the fiber, and when the content exceeds 9% by weight, it is possible to realize more than the desired level of wear resistance and durability, but to produce a fiber, a certain level of tension and frictional force is required. Since the fluctuation of the apostle during spinning is extremely severe because it is out of the above range, even if 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 0.01-5.0 μm, more preferably 0.1-1.0 μm, as measured by an optical microscope or an electron microscope. If it is less than 0.01㎛, 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㎛, there is no continuity with inorganic matters in producing fibers with thermoplastic resin. As a weak point during spinning, it is a direct cause of cutting and fairness.

The present invention includes a fabric having the thermoplastic fiber in which a fluoropolymer is contained in the thermoplastic resin. The thermoplastic 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 thermoplastic fiber according to the present invention is used, the wear resistance can be realized more than 2,000 times even with 150 denier materials.

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, the weight ratio of the sea component, which is the island component and the alkali-soluble polymer, was 70:30, and a island-in-the-sea polyethylene-terephthalate composite fiber having a seven-divided 75-denier 36-filament was produced by a direct spinning method. At this time, the content of the masterbatch was adjusted so that the content of polytetrafluoroethylene in the fiber was 1% by weight.

After producing 88 pieces of 4Kg drums and burning them, they were immersed in 100 ℃ hot water of 30 denier 12 filaments for 30 minutes and then spun with high shrinkable yarns with 25% shrinkage to prepare 105 denier 36 filament yarns. After weaving this into a 32 gauge interlock circular knitting machine, the base fabric was manufactured by shaping and then cutting the fabric width by 50% with a brush. This was further added to NaOH strong alkaline solution of 50% purity in 100 ℃ hot water to adjust the total weight loss concentration to 1wt%. At this time, the weight ratio of the total weight loss and the input fabric was adjusted to be 40: 1. After 60 minutes of weight loss, the fabric weight was reduced by 24wt%, followed by scouring. This was dyed again at 130 ° C. for 60 minutes and then dried at a speed of 30 m / min in a 180 ° C. hot air dryer, followed by a brushing process, and then re-assembling the total species circular knitting paper.

Table 2 shows the results of measuring the wear resistance of the manufactured circular knitting paper.

Example  2

Polyethylene terephthalate fibers and circular knitted fabrics thereof were prepared in the same manner as in Example 1 except that the polytetrafluoroethylene content in the polyethylene terephthalate fibers was changed to 2% by weight.

Table 1 shows the results of measuring the wear resistance of the manufactured circular knitting paper.

Example  3

The polyethylene terephthalate fiber (polytetrafluoroethylene content in the fiber: 1% by weight) prepared under the same conditions as in Example 1 was subjected to a flame treatment to prepare polyethylene terephthalate false twisted yarn, and then the same conditions as in Example 1 were used. Circular knitting paper was prepared.

Table 1 shows the results of measuring the wear resistance of the manufactured circular knitting paper.

Example  4

Polyethylene terephthalate fibers (polytetrafluoroethylene content in the fiber: 2% by weight) prepared by the same conditions as in Example 2 by burning the polyethylene terephthalate false twisted yarn was prepared using the same conditions as in Example 1 Circular knitting paper was prepared.

Table 1 shows the results of measuring the wear resistance of the manufactured circular knitting paper.

Comparative Example  One

Polyethylene terephthalate fibers of 75 denier / 36 filaments were prepared by the radial direct drawing method using the polyethylene terephthalate of Example 1 containing no polytetrafluoroethylene.

Using the prepared polyethylene terephthalate fiber was cut into circular knitted fabric under the same conditions as in Example 1.

Table 1 shows the results of measuring the wear resistance of the manufactured circular knitting paper.

Comparative Example  2

The polyethylene terephthalate fiber (polytetrafluoroethylene content in the fiber: 0% by weight) prepared under the same conditions as in Comparative Example 1 was subjected to a flame treatment to prepare polyethylene terephthalate twisted yarn, and then the same conditions as in Example 1 were used. The circular knitting paper was prepared.

Table 1 shows the results of measuring the wear resistance of the manufactured circular knitting paper.

In Examples 1 to 4 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 instrument 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.

division Wear resistance (times) Example 1 710 Example 2 900 Example 3 2,200 Example 4 3,000 Comparative Example 1 350 Comparative Example 2 1,000

The thermoplastic fiber of the present invention is excellent in 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 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 fiber composed of a thermoplastic resin, wherein the fluoropolymer is contained in the thermoplastic resin. The thermoplastic fiber excellent in durability according to claim 1, wherein the single yarn fineness is 20 denier or less. The durable thermoplastic fiber according to claim 1, wherein the fluoropolymer content in the thermoplastic resin is 0.1 to 9.0% by weight. The thermoplastic fiber having excellent durability according to claim 1, wherein the average particle diameter of the fluoropolymer is 0.001 to 5.0 µm. The thermoplastic 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 fiber, characterized in that one selected from. A fabric comprising the thermoplastic fiber of claim 1.