KR950005433B1 - Polyester composite fiber - Google Patents

Abstract

The polyester fiber dyed by a basic dye having a good strength, coloring properties and alkali resistance properties was prepared. Thus, a polyester resin copolymerized with an isophthalic acid containing a metallic sulfonate group as a core component and a polyethylene terephthalate resin with an 0.66 inherent viscosity as a sheath component were spun at 289 deg. C through a composite spinning nozzle, cooled and wound in the velosity of 1,300 m/min. The obtained yarn was drawn at 87 degree C in the drawing ratio of 3.08, 700 m/min to give the fiber of 75 denier and 36 filaments.

Description

Polyester composite yarn

The present invention relates to a basic dye salt type polyester composite yarn.

In more detail, the present invention is capable of dyeing a basic dye, high thread strength, maintains sufficient strength even after weight loss processing, and excellent color development, alkali resistance and blending of products of the dyed cloth obtained by such a composite yarn. It relates to a basic dye salt type polyester composite yarn.

In the past, efforts have been made to improve the flame retardancy, which is the biggest disadvantage of polyester fiber, to make a knitted fabric of vivid color. As part of this effort, one of the methods to obtain the most vivid colors, a method of producing basic dye salt-type polyester fibers by copolymerizing the isophthalic acid component containing a metal sulfonate group into a fiber is Japan Special Office 59 Known at -10497.

However, when the isophthalic acid component containing such a metal sulfonate group is copolymerized in a large amount, the melt viscosity of the polyester is high, and the spinning is hip. In addition, glycol esters of isophthalic acid containing metal sulfonate groups have a higher hydrolysis rate than other acid glycol esters, and thus have a high rate of decrease in strength and low alkali resistance when performing alkali weight loss processing of the same weight. . To compensate for this drawback, Japanese Patent Laid-Open No. 56-26006 proposes a method of copolymerizing polyethylene glycol components to reduce the isophthalic acid component containing a metal sulfonate group while maintaining dyeability at an equivalent level. However, the method explained that the ultimate viscosity of the polyester should be lower than that of the ordinary polyester, which means that the lower the viscosity, the lower the strength of the yarn. To have.

On the other hand, Korean Patent Publication 88-375 discloses a polymer having high intrinsic viscosity by copolymerizing polyethylene glycol component as an isophthalic acid component copolymer system containing a metal sulfonate group, and having high strength (4.0 g / d) or more) is presented a method for producing a fiber. However, in this case, it is difficult to control the process because the polymerization conditions for producing a uniform copolymer are difficult, and the strength of the fiber presented is 3.0 g / d or more after 20 wt% alkali reduction. However, in recent years, the tendency to prefer a softer knit fabric than a washer has risen, so that a general polyester fabric may be subjected to alkali weight loss processing up to 30% by weight. Therefore, the fiber produced by the method proposed in the present invention is insufficient in strength when the final product, especially difficult to use in silk like products that require a soft touch.

The present invention solves the problems described above, and will be described in detail as follows.

The present invention solves the problems described above, and will be described in detail as follows.

The present invention uses a thermoplastic polyester resin copolymerized with 2.5 mol% or more of isophthalic acid component containing a metal sulfonate group as a core component. In addition, a basic vinegar composite yarn comprising a thermoplastic polyethylene terephthalate resin as a component, wherein the component ratio of the component is 20 to 40% by weight, and the strength of the yarn is 4.5 g / d or more. It is a composite yarn. The present invention provides a thermoplastic component such that the core component made of a thermoplastic polyester resin copolymerized with 2.5 mol% or more of isophthalic acid component containing a metal sulfonate group having a fast weight loss during the weight reduction process can maintain the strength with minimal hydrolysis. Since it is protected by a supercomponent made of polyethylene terephthalate resin, most of the supercomponent composed of polyethylene terephthalate resin is subjected to the hydrolysis action concentrated on the surface part. It can be maintained.

On the other hand, in the present invention, since the core component is made of a thermoplastic polyester resin copolymerized with 2.5 mol% or more of isophthalic acid component containing a metal sulfonate group, a vivid color can be obtained when dyed with a basic dye. In addition, the present invention can achieve the object of the present invention to the maximum only by making the component ratio of the second component 20 to 20% by weight. If the component ratio is less than 20% by weight, the hydrolytic action affects the core component during the alkaline weight loss process, and there is a drawback that a sudden decrease in strength occurs. On the contrary, if the component ratio exceeds 40%, a general weight loss process of 30% by weight is performed. Even after roughening, the polyethylene terephthalate which is a supercomponent remains much, and the dyeing rate of basic dye falls and it becomes impossible to obtain a vivid color.

On the other hand, the basic dye salt type polyester composite yarn of the present invention should be more than 4.5g / d of the strength of the yarn. Because the strength of 3.0g / d or more in the final processed paper after weight loss of about 30% by weight, tear strength is not drastically reduced, it is possible to secure the form stability of the knitted fabric.

Example 1-8, Comparative Example 1-4

The core component is composed of a polyester resin copolymerized with an isophthalic acid component containing a metal sulfonate group, and a polyethylene terephthalate resin having an intrinsic viscosity of 0.66 as a primary component. After forming the core sheath type composite cross section and passing through a general cooling device, it is wound at a speed of 1300m, / min to produce a non-drawn yarn, and using the conventional two-stage thermal stretching machine, the stretching speed 700m / min, stretching ratio 3.08, stretching temperature of 87 ℃, heat setting temperature of 140 ℃ to draw the final drawn yarn of 75 denier, 36 filaments. In addition, by using the operator, weaving was made into a 1/2 twill structure with a warp density of 36 ol / cm and weft density of 32 ol / cm. After losing the dough in a continuous process, the weight loss treatment was reduced to 30% by weight in an aqueous solution of 3.8% caustic soda at a temperature of 95 ° C., and preset in a tenter at 190 ° C. for 1 minute. 5% by weight, acetic acid 0.5ml / l. Staining 60 minutes in a 120 ° C salt bath of 1: 100 with soda acetate 0.2g / l. After sufficient washing with water, it was set again for 45 seconds at the temperature of 170 degreeC using the tenter, and the final processed paper was produced.

Table 1 shows the strength and color development of the yarn in this final paper state.

If the conditions of the present invention are satisfied, it is possible to obtain a processed paper having sufficient strength while maintaining excellent strength and having a high-quality blend of soft touch, but otherwise it is not possible to achieve the object of the present invention. have.

On the other hand, the evaluation of the color development in Table 1 was measured by L, a, b value using a computer color matching system manufactured by ICI UK, and when judged by the dye used in the present invention, the larger the value of L value, the value of a and b value The smaller the number, the more vivid colors are.

TABLE 1

However, 1) Comparative Example 4 is a single component 75/36 filament not a composite yarn.

2) The quadrangular shape is triangular in Example 2-4, tetragonal in Example 5, and all others are circular.

Claims (1)

The core component is a thermoplastic polyester resin copolymerized with 2.5 mol% or more of isophthalic acid component containing a metal sulfonate group, and the super component is made of thermoplastic polyethylene terphthalate resin, but the composition ratio of the super component is 20-40% by weight. And the polyester composite yarn characterized in that the strength of the yarn before the weight loss processing is 4.5g / d or more.