KR100457548B1 - Manufacturing method of anti-pilling polyester fiber with excellent leveling agent - Google Patents

Abstract

The present invention relates to a method for producing polyester fibers having excellent anti-pilling property, which comprises producing undrawn yarn by a conventional method and drawing the drawn yarn at a drawing temperature of 110-120 ° C. and a heat setting temperature of 230-250 ° C. .

Polyester fibers produced by the stretching technology of the present invention has good workability and productivity and has a uniform fineness.

Description

Method for producing anti-pilling polyester fiber

The present invention relates to a method for producing an anti-pilling polyester fiber, in particular a method of imparting anti-pilling property to the fiber in terms of physical properties by the stretching technology.

Polyester fiber has the most important position among all fibers due to its many advantages such as excellent physical and chemical properties as well as easy handling.

However, when polyester fiber is used for clothing, a part of the fiber on the surface of the fabric has a drawback due to mutual friction during use, which makes the appearance of the product dirty and deteriorates.

Several methods have been developed to impart anti-pilling, the principle of which is to reduce the work of rupture. In other words, the elongation of the fiber is reduced to induce peeling of the peel due to friction. Fracture day is defined as the energy consumed until the fiber is broken by the tensile force.

In general, methods for imparting anti-pilling property to polyester fibers include low polymerization method, copolymerization method, internal structure destruction method, and the like. The low-polymerization method proposed in Japanese Special Office 35-8562 can reduce the strength by lowering the degree of polymerization of polyester, which can prevent the peeling phenomenon, but the melt viscosity is lowered, resulting in poor radioactivity and relatively high elongation. Breaking days, which is an important factor of sex, is similar, so anti-pilling properties are not significantly improved.

The copolymerization method proposed in Japanese Patent Application No. 43-4545, 44-26972, etc. is the most widely used method for producing anti-filling fibers, and is a method of copolymerizing a compound having 3 or 4 functional groups. High copolymers can be obtained. About 0.5 is suitable for a viscosity, Penta erythritol, trimellitic acid, its anhydride, etc. are used as a copolymerization compound. This method can lower the strength and elongation at the same time, so the anti-pilling property is good, but it requires the washing of the reactor before and after the esterification reaction to produce the copolymer in the polymerization process, and the entanglement of the molecular chains increases, which leads to spinning and stretching workability. This deterioration has a flaw.

In Japan's specialty office 50-22617, the internal structural destruction method that reduces the elongation of fibers by stretching unstretched toe and cooling it to 10-30 ° C and crimping it has the advantage of using a general polyester resin without synthesizing new copolymer. However, there is a problem that the workability and productivity is lowered due to the cooling process.

The present invention aims to produce an anti-filling polyester fiber having a good workability and productivity and uniform fineness by the stretching technology in a method belonging to a kind of internal structure breaking method without the above problems.

The present invention is prepared by the unstretched yarn by melt spinning the polyethylene terephthalate in a conventional method, and then using a homogenizer to prepare a stretched yarn to a stretching temperature of 110-120 ℃, heat setting temperature of 230-250 ℃ Relates to a method for producing an excellent anti-pilling polyester fiber.

The stretching temperature of the fiber has a great influence on the physical properties. In general, in order to lower the strength of the fiber, the stretching is performed at a temperature below the glass transition temperature of the resin. In this case, although the strength decreases, slippage between the roller and the fiber, which gives a tension during stretching, occurs, and a portion that is stretched and a portion that is not completely stretched is caused, resulting in non-uniformity of fineness in the form of poise thread.

However, when the stretching is performed at a temperature much higher than the glass transition temperature, the strength is similar to that of the low temperature stretching, but the uniform fineness is obtained. When the stretching temperature is higher than the appropriate temperature, the molecular chains have a high mobility so that the slippage between the molecular chains occurs and the number of tie molecules connecting between the crystal and the amorphous region which causes the fiber strength to be expressed is small. The strength decreases, but the tension between the roller and the tensioning fiber does not occur, so that the unevenness of the fineness does not occur.

For example, when the stretching temperature is 50 and 65 ° C., the uniformity (U%) is 7.5 and 4.5, respectively, and there is a problem in uniformity, but when stretching at 120 ° C., the uniformity (U%) is 1.6. In addition, the fibers stretched at 50 ° C. tend to be damaged on the surface of the fibers.

The heat setting temperature does not significantly affect the strength but the elongation. When the heat setting temperature is 20 ° C. or higher than the temperature for expressing the optimum physical properties, the elongation is reduced by 20% or more.

As described above, when the stretching temperature is 110-120 ° C., the strength of the fiber is reduced, and when the heat setting is performed at 230-250 ° C., the elongation can be reduced. Thus, polyester fibers having uniform fineness and excellent anti-pilling property can be manufactured. have.

In the present invention, the anti-pilling property was set to a rotation time of 5 hours using an ICI tester specified in JIS L1076, and the grades of grades 3 and above were classified by classifying 1-5 grades of filling and dropping of the peeling.

The following examples and comparative examples will be described in more detail the manufacturing method of the anti-pilling polyester fiber according to the present invention, but the scope of the present invention is not limited by the following examples and comparative examples.

Examples 1-2, Comparative Examples 1-4

A non-drawn yarn was prepared by melting (25 ° C., o-chlorophenol) polyethylene terephthalate resin having an intrinsic viscosity of 0.64 at 285 ° C. and winding it at a rate of 1000 m / min, thereby preparing a drawn yarn at a draw ratio of 3.2 times. Drawing conditions, physical properties and anti-pilling properties are shown in Table 1.

The anti-fillable polyester fiber produced by the present invention enables to produce an anti-fillable polyester fiber having excellent workability and productivity and uniform fineness even with a relatively simple stretching technique.

Claims (1)

Polyethylene terephthalate is melt-spun in a conventional manner to prepare a non-stretched yarn, and then stretched yarn of 110-120 ° C., heat-setting temperature of 230-250 ° C. to produce a stretched yarn. Method for producing peeling polyester fiber.