KR950000718B1 - Manufacturing method of different shrinkage polyester yarn - Google Patents

Abstract

The high contractive polyethyleneterephtalate copolymer is synthesized from terephtalic acid and 7-13 mole% of 1,4 butandiol or neophentyl glycol. A high and low contrative polyethylene terephtalates is mixed in weight ratio of 1:1 - 1:2 and spun through a distribution plate. When spin drawn, the 1st godet roller is heated to Tg-5 - Tg+10 deg.C for elevating stretch property and the 2nd godet roller is maintained at 90-120 deg.C for elevating bi-contraction effect. By this condition, the final contractile ratio becomes 15-40%.

Description

Manufacturing method of polyester shrink shrink blended yarn

1 is a schematic diagram of a spin draw composite spinning device used in the present invention.

The present invention relates to a method for producing polyester biaxially blended yarn.

More specifically, the low-shrinkable polyethylene terephthalate and the high-shrinkable polyethylene terephthalate were spun through a distribution plate giving various mixing effects in the composite spinning pack, followed by changing the temperature of the high-pressure roller in the spin draw process. The present invention relates to a method for producing a polyester-based bishrink blended yarn that is equivalent to natural dry fibers by allowing the shrinkage carcass to be expressed by heat treatment in a post-processing process.

As a method for producing a silk like material, there are known Japanese specialty agencies 51-10620, 53-31972, 55-3122586, 58-3064, and the like.

The above method is a method of stretching and blending the same yarn with different thermal history by separating the spinning and stretching processes, but it has excellent sublimation and abundance, but has a limit to fine-grained fineness and low productivity.

In addition, Japanese Patent Application Laid-Open Nos. 51-30620, 55-57013 and 2-19528 use a thermoplastic resin with a low shrinkage component and a high shrinkage component, and then spun through a distribution plate in a composite pack, and then spin speed 800 to 1300. As a method of manufacturing diaxial blended yarn with a meter / minute and a draw ratio of 3.31 to 3.62, the above methods are more productive than the method of stretched blended islands, but lack the sublime property and mixing of products.

In order to improve productivity, Japanese Laid Openings 54-134119, 60-126316, Japanese Patent Application Laid-Open Nos. 1-221505, and 2-127514 use two spin draw spinners to change thermal history or draw ratios. However, this method is another form of stretched mixed island, there is a disadvantage in the process inefficient.

In addition, Japanese Patent Application Laid-Open No. 61-160419 is a process in which a composite spinning process and a spin draw method (spinning speed: 5600 to 6050 meters / minute) are used, but the productivity is high, but the quality of the sublime and the mixing are inferior to that of the stretched island.

The present invention is a composite spinning by mixing a high shrinkable polyethylene terephthalate and a low shrinkable polyethylene terephthalate in order to be able to produce a polyester yarn biaxial blended yarn having excellent sublimation, mixing, touch, etc. with high productivity By varying the temperature of the roller is characterized in that the shrinkage difference between the high shrinkage polyethylene terephthalate and low shrinkage polyethylene terephthalate by the heat treatment in the post-processing.

Hereinafter, the present invention will be described in detail.

In the present invention, the highly shrinkable polyethylene terephthalate is a copolymerized polyethylene terephthalate obtained by adding 7-13 mol% of neopentyl glycol, isophthalic acid or 1,4-butanediol to terephthalic acid or ethylene glycol as a copolymerization component, and to the regular polyethylene terephthalate. In comparison, the crystallinity is lowered to promote crystallization by heat, thereby giving high shrinkage characteristics.

Low shrinkage polyethylene terephthalate is a general polyethylene terephthalate.

The high shrinkage polyethylene terephthalate and low shrinkage polyethylene terephthalate were combined spun at a weight ratio of 1: 1 to 1: 2.

In the present invention, when the copolymerization component of the highly shrinkable polyethylene terephthalate is less than 7 mol%, the crystallinity is high, and the high shrinkage property is insufficient, and when it exceeds 13 mol%, the spinning and stretching workability and the mechanical properties of the yarn are lowered.

Compound ratio of the two components in the present invention was adjusted through the distribution plate of the composite pack.

In the present invention, the first gourd rollers were heated to Tg-5 ° C to Tg + 10 ° C in order to increase the elongation during spin draw, and the second gourd rollers had a highly shrinkable polyethylene terephthalate and a low shrinkage polyethylene tere. In order to increase the shrinkage difference between phthalates, the temperature was maintained at 90 to 120 ° C. to achieve a 15% to 40% shrinkage rate (DFL: Differential Fiber Length).

In the present invention, if the temperature of the first gourd roller is less than Tg-5 ° C, the spinning workability is good, but the dyeing property is poor, and if it exceeds Tg + 10 ° C, workability due to trimming is poor.

In addition, when the temperature of the second high roller exceeds 120 ° C, the shrinkage difference between the low shrinkable polyethylene terephthalate and the high shrinkable polyethylene terephthalate is small, so that the shrinkage ratio DFL is less than 15%, and the shrinkage effect is low, and at the same time, the vibration of the thread in the high roller is severe. Decreased dyeability and worsening of microbiota (U%).

The polyester biaxially blended yarn prepared by the present invention is particularly suitable as a material for women's dresses and blouses, because it has better gloss, feel, blending, sublimeness and similarity to natural silk, compared to conventional polyester yarns. And since the spin draw method is adopted, productivity can be improved and manufacturing cost can be reduced.

EXAMPLES 1-6

Low shrinkage polyethylene terephthalate uses regular polyethylene terephthalate containing 0.64 dl / g ultimate viscosity and 0.35 wt% TiO _2, while high shrinkage polyethylene terephthalate has 0.66 dl / g extreme viscosity and 0.035 wt% TiO ₂ The copolymer content ratio is low by using a polyethylene terephthalate copolymer containing 10.8, 9.4 mol% of neopentyl glycol, 8.9 mol% of isophthalic acid, and 12.1 mol% of 1,4-butanediol, compared to EG, respectively. The shrinkable polyethylene terephthalate and the highly shrinkable polyethylene terephthalate were passed through the distribution plate in the composite pack at the compound ratio of Table 1 and discharged through a spinneret having a diameter of 0.23 mm and an airborne 24 at a melting temperature of ℃.

The discharged thread is cooled by cold air of the cooling device, and after applying 1.0 wt% of oil to the emulsion roller, the temperature of the first gourd roller is 79 ℃, the speed 1200m / min, the number of turns 5.5 times, and the temperature of the second gourd roller is 110 ℃. After stretching at a speed of 3847 meters / minute, a number of turns of 6.5, and a draw ratio of 3.214, a wound machine was wound to prepare a blended yarn of 50 denier / 24 filaments.

Weaving into five runner tissues using this blended yarn, loosening heat treatment at 95 ℃ × 30 minutes in a continuous refiner, reducing 95 ℃ × 20 minutes in a caustic soda tank, preheating at 180 ℃ for 1 minute, and 40 at 130 ℃ Powder dyeing was performed by heat setting at 170 degreeC for 40 minutes.

The non-shrinkage rate was measured by releasing the mixed fiber in 100 ° C. boiling water for 30 minutes, and the non-aqueous DFL (Differential Fiber Length) was obtained from the following equation.

Dagger

HWS _h : Non-shrinkage rate of highly shrinkable polyethylene terephthalate

HWS ₁ : Non-shrinkage rate of low shrinkage polyethylene terephthalate

The dry heat shrinkage was measured by relaxing the mixed fiber in dry heat at 150 ° C. for 30 minutes, and the dry heat DFL was obtained from the following equation.

Dry heat

DAS _h : Dry heat shrinkage rate of highly shrinkable polyethylene terephthalate

DAS ₁ : dry heat shrinkage rate of low shrinkage polyethylene terephthalate

Sublime, abundance and stainability were visually judged.

The manufacturing conditions and physical properties are shown in Table 1.

[Comparative Examples 1 and 2]

Polyethylene terephthalate containing an intrinsic viscosity of 0.65 dl / g and 0.035% by weight of TiO ₂ and a copolymerized component of neopentylglycol containing 5.6 and 14.3 mole% of EG as a highly shrinkable polyethylene terephthalate was mixed under the conditions of Example 1. The thread was prepared. The manufacturing conditions and physical properties are shown in Table 1.

EXAMPLES 7-10

Polyethylene terephthalate containing 0.66 dl / g of intrinsic viscosity and 0.035% by weight of TiO ₂ and 10.8 mol% of neopentyl glycol is used as a highly shrinkable polyethylene terephthalate, and intrinsic viscosity 0.64 dl / g, TiO ₂ Using a regular polyethylene terephthalate containing 0.35% by weight as a low-shrinkable polyethylene terephthalate, the composite ratio of low-shrinkable polyethylene terephthalate and high-shrinkable polyethylene terephthalate (1: 1) was passed through a distribution plate in a composite pack at 295 ° C. At the melting temperature, it was discharged through a spinneret of 0.23 mm in diameter and 24 airborne spinnerets.

The discharged yarns were cooled by cold air to give 10 wt% of oil to the emulsion rollers, and then the blended yarns were manufactured by changing the conditions of the first go roller and the second go rollers as shown in Table 2, and then 50-denier / 24-filament Got.

The mixed paper was manufactured under the conditions of Example 1.

The manufacturing conditions and physical properties are shown in Table 2.

Comparative Examples 3 and 4

The horn-seed yarn was manufactured on the conditions similar to Example 2 in the temperature of a 1st gourd roller below Tg-5 degreeC, Tg + 10 degreeC or more, and the temperature of a 2nd gourd roller 120 degreeC or more. The manufacturing conditions and physical properties are shown in Table 2.

TABLE 1

* Sublime, mixed, dyed; ◎: very good, ○: good, ×: poor

* NPG P: Neopentylglycol

IPA: isophthalic acid

BD: 1, 4 butanediol

TABLE 2

Claims (3)

High shrinkable copolymerized polyethylene terephthalate and regular polyethylene terephthalate copolymerized by adding 7 to 13 mol% of copolymerized components with terephthalic acid or ethylene glycol are used. A method for producing polyester biaxially blended yarns, which is characterized by drawing on a roller in a draw method. The method for producing a polyester biaxially blended yarn according to claim 1, wherein the composite ratio of the highly shrinkable copolymerized polyethylene terephthalate and the regular polyethylene terephthalate is 1: 1 to 1: 2 by weight. The method for producing a polyester biaxially blended yarn according to claim 1, wherein the temperature of the first gourd roller is set to Tg-5 deg. C to Tg + 10 deg. C and the temperature of the second gourd roller is made to 90 deg.