KR960011606B1 - Process for producing polyester embroider yarn - Google Patents

Abstract

The invention relates to the preparation of polyester embroidery yarn which both tensile strength and deflectivity, are lowered by the addition of smoll amount of additives to the polymerizotion process, and heat constructile power is lowered by the adjustment both of relaxation drawing magnification and heat-treatment at a proper temperature.

Description

Manufacturing method of polyester embroidery thread

The present invention relates to a method for producing a polyester embroidery thread, and more particularly, by adding a small amount of an additive to a polymerization process of a polyester resin, simultaneously reducing tensile strength and elongation at break, and adjusting the relaxation elongation ratio and heat treatment temperature of a four-stage drawing process. The present invention relates to a method for producing a polyester embroidery thread by lowering a heat shrinkage rate.

In general, embroidery yarns have been mainly used for rayon fibers that have good dyeability and excellent machine embroidery or computer embroidery processes. However, rayon fibers have been required to be replaced with polyester fibers, which do not cause occupational diseases, due to problems such as skin failure in intermediate work processes such as yarn.

To be used as embroidery yarns, polyester fibers must have a tensile strength of 2.5 to 3.5 g / d, an elongation at break of 15 to 25%, and a heat shrinkage of 2% or less.

If the tensile strength is less than 2.5g / d, trimming is likely to occur in intermediate processes such as weaving, and if the tensile strength is greater than 3.5g / d, the cutting process after embroidery is poor and the appearance is poor. If the elongation at break is less than 15%, the intermediate process is poor. If the elongation at break is more than 25%, the embroidery surface is convex due to puckering after embroidery. In addition, if the heat shrinkage exceeds 2%, shrinkage occurs in the heat set process, resulting in poor appearance of the fabric.

However, the existing polyester fiber has a tensile strength of 5.0g / d, an elongation at break of 30%, a heat shrinkage rate of 8%, and is not suitable for use as embroidery, and the tensile strength and elongation at break are inversely related. It is difficult to simultaneously lower the tensile strength and elongation at break due to the change.

Therefore, the present invention solves the problem of the existing polyester, by adding an additive to the polymerization process of the polyester resin to lower the tensile strength and elongation at the same time and to adjust the relaxation stretch ratio and heat treatment temperature of the four-stage stretching process It is to provide a method for producing a polyester embroidery yarn by reducing the shrinkage.

Hereinafter, the present invention will be described in detail.

The present invention condensation reaction of bi-functional carboxylic acid and di-functional glycol to prepare polyester embroidery yarn, the bi-functional carboxylic acid in the dimethyl terephthalate 100 mol% 0.5 to 5.0 mol% dimethyl sulfonate, dimethyladi 1-10 mol% of pate was added and ethylene glycol was condensation-polymerized using difunctional glycol, followed by melting, spinning and stretching to obtain tensile strength of 2.5 to 3.5 g / d, elongation at break of 15 to 25%, and thermal shrinkage. It relates to a method for producing a polyester embroidery yarn characterized in that less than 2%.

Hereinafter, the present invention will be described in more detail.

The present invention relates to a method for preparing a polyester embroidery yarn by adding dimethyl sulfonate and dimethyl adipate to dimethyl terephthalate and then condensing ethylene glycol to prepare a polyester polymer and melting, spinning and stretching it. The addition of a small amount of dimethylsulfonate improves the dyeability of the polyester fiber, but it is known that it is difficult to obtain a certain level of molecular weight due to an increase in the melt viscosity during the condensation reaction.

Therefore, polyester fiber having low tensile strength and elongation at break can be obtained by adding dimethyl sulfonate. When the amount of dimethyl sulfonate added is less than 0.5 mol%, there is almost no effect of lowering strength and elongation. Increases rapidly, resulting in poor polymerization process.

When dimethyl adipate is added, the melt viscosity is lowered, thereby improving the polymerization process. If the amount of dimethyl adipate is less than 1 mol%, there is little effect of improving the melt viscosity. The stretching process is poor.

At this time, the intrinsic viscosity of the obtained polyester polymer is preferably 0.5 to 0.6 in terms of processability and physical properties. If the intrinsic viscosity is less than 0.5, the molecular weight is low to lower the fiber forming ability. Inappropriate.

The polyester polymer thus obtained was spun and stretched to produce fibers. In order to lower the heat shrinkage rate, it was preferable to set the relaxation stretching ratio of the four-stage stretching to 0.90 to 0.98 and the heat treatment temperature to 200 to 240 ° C. If less than 0.90, the elongation is poor due to excessive relaxation, and if it exceeds 0.98, the effect of improving heat shrinkage is less. Also, if the heat treatment temperature is less than 200 ° C., the heat treatment effect is less. It was.

The polyester embroidery yarn of the present invention prepared as described above has excellent tensile strength of 2.5-3.5g / d, elongation at break of 15-25%, thermal shrinkage of less than 2%, and can replace existing rayon embroidery yarn. Indicated.

The heat shrinkage rate in the present invention was evaluated according to the method of JIS L 1073, but was measured using the real shrinkage rate method.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited by Examples.

Example 1

100 mol% of dimethyl terephthalate, 2.0 mol% of dimethylsulfonate, 3.0 mol% of dimethyl adipate, 210 mol% of ethylene glycol, 0.021 mol% of cobalt acetate, and 0.65 mol% of sodium acetate in a reactor equipped with a stirrer, a distillator, and a nitrogen inlet tube. After the temperature was raised to 200 ° C. over 2 hours while undergoing a transesterification reaction at 160 ° C., 0.385 mol% of trimethyl phosphate and 0.064 mol% of antimonitrioxide were added. After heating up to 240 ° C., 40 minutes of reaction under low vacuum and 70 minutes of reaction under high vacuum of 0.1 mmHg or less were made in the form of chips. The intrinsic viscosity of the orthochlorophenol solution was 0.55 dl / g.

The resin thus obtained was vacuum dried at 130 ° C. for 3 hours and at 160 ° C. for 10 hours, and then, at a screw extrusion type spinner, with a diameter of 0.1 mm and a 36-hole-type nozzle, the spinning temperature was 300 ° C. and the winding speed was 1000 m / min. Got a gentleman. The unstretched yarn is drawn in a four-stage drawing machine under the conditions of drawing speed of 1000m / min, first draw ratio 1.006, second draw ratio 2.73, third draw ratio 1.199, relaxation draw ratio 0.95, and heat treatment temperature 220 ℃. A drawing company was obtained.

The physical properties of the drawn yarn thus obtained were measured and shown in Table 1.

Example 2

In Example 1, 1.5 mol% of dimethyl sulfonate and 5.0 mol% of dimethyl adipate were added thereto, and the reaction was carried out under the same conditions as in Example 1. The intrinsic viscosity of the resin thus obtained was 0.58 dl / g.

In addition, the yarns were spun under the same conditions as in Example 1, and stretched yarns were stretched under the conditions of 0.975 and a heat treatment temperature of 210 ° C. in the four-stage stretching process to obtain a stretched yarn.

Example 3

After the polymerization reaction was carried out under the same conditions as in Example 1 for 60 minutes under high vacuum to prepare a chip shape, the intrinsic viscosity of the resin thus obtained was 0.53dl / g.

In addition, the yarn was spun under the same conditions as in Example 1, and the stretched stretch ratio was stretched to 0.93 in the four-stage stretching process to obtain a stretched yarn.

Comparative Example 1

In Example 1, a polymerization reaction was performed under the same conditions without addition of dimethylsulfonate and dimethyl adipate, thereby preparing a resin having an intrinsic viscosity of 0.53 dl / g.

In addition, spinning and stretching were carried out under the same conditions as in Example 1 to obtain a stretched yarn.

Comparative Example 2

After the polymerization reaction was carried out under the same conditions as in Example 2, the reaction was carried out under high vacuum for 90 minutes to prepare a chip shape. The inherent viscosity of the resin thus obtained was 0.63 dl / g.

In addition, spinning and stretching were carried out under the same conditions as in Example 1 to obtain a stretched yarn.

Comparative Example 3

After superposing | polymerizing and spinning on the conditions similar to Example 1, it extended | stretched on the conditions of relaxation stretch ratio 0.99 and heat processing temperature 230 degreeC in the 4-step drawing process, and obtained the stretched yarn.

Claims (3)

Condensation reaction between difunctional carboxylic acid and difunctional glycol to prepare polyester embroidery yarn, wherein as bifunctional carboxylic acid, 100 mol% of dimethyl terephthalate, 0.5 to 5.0 mol% of dimethyl sulfonate, and 1 to dimethyl adipate 10 mol% is added, and as the bifunctional glycol, ethylene glycol is used for condensation polymerization, followed by melting, spinning and stretching to obtain tensile strength of 2.5 to 3.5 g / d, elongation at break of 15 to 25%, and heat shrinkage of less than 2%. Process for producing polyester embroidery thread. The method of claim 1, wherein the intrinsic viscosity of the polymer is 0.5 to 0.6. The method of claim 1, wherein the stretching is carried out in a relaxation stretching ratio of 0.90 to 0.98 and a heat treatment temperature of 200 to 240 DEG C in a four-step stretching process.