JPH083817A - Method of multi-strand spinning of polyether-ester elastic yarn - Google Patents

Abstract

PURPOSE:To produce a polyether-ester elastic yarn which has excellent elastic recovery and resistance to chemicals, heat and weather (light), thus is useful as a material for clothing and industrial purposes by melt-extruding a polyether- ester elastic polymer under specific conditions. CONSTITUTION:A polyether-ester elastic yarn including poly(ethylene terephthalate) and/or ply(butylene terephthalate) as a hard segment and a linear polyalkylene glycol as a soft segment is melt-extruded into four or more yarns every spinneret at a spinning rate higher than 300m/min. At the position less than 2,500mm from the spinneret nozzle face, lower than the yarn solidification point, these individual yarns are divided, treated with a finishing oil using an oil applicator 4 to prevent yarn sticking and unevenness in physical properties between these yarns.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for clothing and industrial materials and has excellent elastic recovery, chemical resistance and weather (light) resistance. The present invention relates to a multi-spindle spinning method capable of efficiently producing a polyetherester-based elastic yarn having excellent heat resistance. Polyurethane-based elastic yarns have been most commonly used as elastic yarns for clothing and industrial materials. However, although polyurethane elastic yarns have excellent elastic recovery properties, they are heat resistant, chemical resistant, and weather resistant (light).
It has the drawback of being poor in performance. Further, in order to solve these problems, in recent years, a polyetherester-based elastic yarn having a highly crystalline polyester such as polyethylene terephthalate or polybutylene terephthalate as a hard segment and polyarylene glycol as a soft segment has been developed and put into practical use. Has been converted. However, the polyetherester elastic yarn has a problem that the productivity is extremely poor because the production method is complicated and the spinning speed is low as compared with ordinary polyester fiber. As a means of improving productivity, a multiple-spinning method in which multiple threads are spun from one spinneret and divided and wound is effective, but adhesion of the threads to each other and unevenness of physical properties between the threads may occur. There is a problem that it will occur. DISCLOSURE OF THE INVENTION The present invention uses a polyester ester elastic yarn having excellent elastic recovery performance, heat resistance, chemical resistance, and weather (light) resistance to produce polyester for ordinary clothing. An object of the present invention is to provide a multi-thread spinning method that can be efficiently manufactured using equipment. The present inventors have arrived at the present invention as a result of intensive studies to solve the above problems. That is, polyethylene terephthalate and / or polybutylene terephthalate as a hard segment,
A multi-spindle spinning method in which a polyetherester-based elastic body having a linear polyalkylene glycol as a soft segment is melt-spun from a single spinneret to four or more yarns at a spinning speed of 300m / min or more, and divided and wound. In this method, the polyether ester-based elastic material is characterized in that it is divided into individual yarns using a yarn dividing guide at a position below the solidification point of the yarns and within 2500mm from the spinneret discharge surface, and then an oil agent is applied. The main point is the multi-spinning method of yarn. The present invention will be described in detail below. The polyether ester constituting the elastic yarn of the present invention needs to have polyethylene terephthalate (PET) and / or polybutylene terephthalate (PBT) as a hard segment. The ratio of PET to PBT is not particularly limited, but when the PBT is large, the elastic recovery property is excellent, and when the PET is large, the strength / elongation property is excellent. Therefore, depending on the purpose, the molar ratio of both should be 100 / 0-
It may be selected in the range of 0/100. On the other hand, linear polyalkylene glycol is used as the soft segment, but in practical use, polytetrabutylene terephthalate (PTMG) having a molecular weight of 500 to 3000 is most suitable. The ratio of the hard segment to the soft segment is not particularly limited, but usually 80/20 by weight.
It is selected in the range of 20/80. If the hard segment is large, the strength / elongation property is excellent, but the elastic recovery is inferior, and if the amount of the soft segment is large, the performance is the opposite.Therefore, if this is taken into consideration, select an appropriate ratio according to the purpose. Good. Further, the polyether ester may contain additives such as an antioxidant, a pigment, a light stabilizer, a reinforcing agent and a modifier. The present invention is intended to efficiently produce a polyetherester-based elastic yarn, and a polyetherester-based elastic body is spun at a spinning speed of 300 m / min or more from one spinneret to four or more yarns. The target is the multi-spinning method in which a filament is melt-spun, divided and wound. The most important point of the present invention is that in such a multi-spinning method, in order to prevent the yarns from adhering to each other and the physical properties between the yarns to be prevented, individual yarns are guided by a yarn separating guide at a specific position. Divide into and apply the oil agent. That is, it is necessary to dispose the yarn separating guide below the solidification point of the yarn, within 2500 mm from the spinning nozzle discharge surface, and in front of the oil agent applying device. If the position of the yarn splitting guide is too close to the ejection face of the spinneret, the yarn is not cooled and solidified, and the yarn is fused and broken when it comes into contact with the guide. According to the experience of the present inventors, in the case of a polyetherester-based elastic body, the spinning temperature and cooling conditions are set so that the solidification point is located near 600 to 1000 mm after the spinning nozzle is discharged, regardless of the melt viscosity and melting point of the polymer. If adjusted, stable spinning is possible. On the other hand, if the distance from the spinneret discharge surface to the yarn separating guide exceeds 2500 mm, the yarn wobble becomes large and the yarns come into close contact with each other, so that the split winding cannot be performed. Considering these points, it is preferable that the yarn separating guide is provided at a position within 2500 mm from the spinneret discharge surface, which is about 100 mm below the solidifying point. Also,
The thread dividing guide needs to be installed in front of the oil agent applying device. If the yarn is not divided in front of the oil agent applying device, the spun yarn will directly enter the oil agent applying device. The contact length is changed, uneven adhesion of the oil agent occurs, and physical properties change due to uneven tension, which is not preferable. The oil agent applying device used in the present invention is preferably a rotary roller type or a slit type, and particularly preferably a rotary roller type. It is preferable that a second yarn splitting guide is provided between the oil agent applying device and the first godet roller because the yarn splitting is facilitated. A schematic process diagram of one embodiment of the method of the present invention is shown in FIG. The yarn discharged from the spinneret 1 is cooled by the cooling cylinder 2 and solidified, then enters the yarn separating guide 3 and is separated into yarns. Next, after being refueled by the oil agent applying device 4,
Passes through the second yarn splitting guide 5 and the yarn width guide 6 and
It is taken up by a godet roller 7, then passed through a second godet roller 8 and a yarn path guide 9, and then taken up by a winder 10. EXAMPLES Next, the present invention will be described in detail with reference to examples. The measurement and evaluation methods in the examples are as follows. The measurement was carried out at a temperature of 20 ° C using an equal weight mixture of an intrinsic viscosity phenol and ethane tetrachloride as a solvent. Elastic recovery rate Using Tensilon UTM-4-100 type manufactured by Oriental Co.,
After stretching to 100% or 200% at a sample length of 10 cm and a pulling speed of 10 cm / min, return to the original length at the same speed, and when stretching again, find the length when stress appears, and recover the elasticity by the following formula. I asked for the rate. The number of measurements was 10 and the average value was used. Elastic recovery rate (YE) = [(E ₀ −E ₁ ) / E ₀ ] × 100 E ₀ : Stretched length E ₁ : Length at which stress appears when stretched again Strength Elongation Made by Oriental Using Tensilon UTM-4-100 type,
The sample length was 10 cm and the tensile speed was 10 cm / min. The number of measurements was 10 and the average value was used. Examples 1 to 4 and Comparative Examples 1 to 5 19.4 kg of dimethyl terephthalate and 11.7 kg of 1,4-butanediol were charged into a reaction vessel, 10 g of tetrabutyl titanate was added as a catalyst, and the mixture was heated under normal pressure at 210 ° C. for 2.5 hours. A transesterification reaction was performed. The obtained reaction product was transferred to a polymerization vessel, 33 kg of PTMG having a molecular weight of 2000 was added, and then a polycondensation reaction was carried out at 250 ° C. for 4 hours under a reduced pressure of 1 Torr or less. The polymer obtained has an intrinsic viscosity [η] of 2.35 and a melting point (Tm) of 185
° C. The weight ratio of PBT and PTMG in this polymer was about 5/5. After drying this polymer under reduced pressure, the spinning temperature was set to 260 ° C. using an ordinary melt spinning machine,
As the spinneret, 12 spinning holes with a diameter of 0.5 mm arranged in a circle were used, and the discharge amount, the first godet roller (first G
R) and the speed of the second godet roller (second GR) and the winding speed were set as shown in Table 1, and multi-thread spinning was performed to obtain 12 threads of 40 denier. At this time, the position of the thread dividing guide and the position of the oil agent applying device were also changed as shown in Table 1. (However, in Comparative Example 1, a satin bar guide having a diameter of 10 mm was used in place of the thread dividing guide.) A rotating roller type was used as the oil agent applying device, and a silicone water emulsion type was used as the oil agent. The AW 307 type winding machine manufactured by Teijin Seiki Co., Ltd. was used as the winding machine. Continuous spinning was carried out for 5 days, the number of yarn breakages per day was examined, and the tenacity and elongation of yarns, their variation (standard deviation), and elastic recovery rate were obtained. The results are shown in Table 1. [Table 1] Examples 6 to 7 and Comparative Examples 5 to 6 The discharge amount was adjusted under the same conditions as in Example 4 and Comparative Example 3 except that the number of holes in the spinneret was set to 4 or 6, and 40 denier yarn was prepared. Obtained. Table 2 shows the spinning conditions, the performance of the obtained yarn and the number of yarn breakages at this time. [Table 2] EFFECTS OF THE INVENTION According to the present invention, when a polyetherester-based elastic yarn is subjected to multi-thread melt-spinning, twisting and adhesion of the yarns to each other are prevented, and a polyetherester-based elastic yarn having less physical property unevenness. Can be manufactured with high productivity. Further, the method of the present invention can be easily carried out by an apparatus obtained by slightly improving a spinning apparatus for producing ordinary polyester fibers.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic process drawing showing one embodiment of the method of the present invention. [Explanation of Codes] 1 Spinneret 2 Cooling Tube 3 Thread Separation Guide 4 Lubricant Applying Device 5 Second Thread Separation Guide 6 Yarn Width Guide 7 First Godet Roller 8 Second Godet Roller 9 Thread Guide Restriction Guide 10 Winder

Claims (1)

Claims: 1. Polyethylene terephthalate and / or polybutylene terephthalate as a hard segment,
A multi-spindle spinning method in which a polyetherester-based elastic body having a linear polyalkylene glycol as a soft segment is melt-spun from a single spinneret to four or more yarns at a spinning speed of 300m / min or more, and divided and wound. In this method, the polyether ester-based elastic material is characterized in that it is divided into individual yarns using a yarn dividing guide at a position below the solidification point of the yarns and within 2500mm from the spinneret discharge surface, and then an oil agent is applied. Multi-thread spinning method.