KR19980049300A - Manufacturing method of polytrimethylene terephthalate false twisted yarn - Google Patents

Abstract

The present invention relates to a method for producing polytrimethylene terephthalate (PTT) false twisted yarn, wherein 1,3-propanediol has a polytrimethylene terephthalate of not less than 85% in the main chain and has an intrinsic viscosity of 0.75 to 1.1 at 2,500 to 5,500 m / It involves spinning at a spinning speed of min to obtain POY yarn, and stretching and combusting it, and by applying this method, it is possible to stably prepare highly crimpable twisted yarn from polytrimethylene terephthalate.

Description

Manufacturing method of polytrimethylene terephthalate false twisted yarn

The present invention relates to a method for producing polytrimethylene terephthalate (PTT) false twisted yarn, and more particularly, to a method for stably producing high crimped false twisted yarn from polytrimethylene terephthalate.

Recently, a resin called polytrimethylene terephthalate has begun to be commercialized in polyester, and it is being developed for various fiber applications because it has excellent elasticity and dyeing property compared to conventional polyester. In particular, it is expected that the excellent properties of PTT can be further enhanced when manufactured with false twisted yarn.

However, when PTT is actually burned, the heat resistance is insufficient, and thus the burnt temperature is not increased to 100 ° C. or more. In addition, because the flammability fairness is not good, the trimming occurs frequently, and the appearance of the cows is poor, so there are many problems for commercial production.

Accordingly, an object of the present invention is to provide a method for producing polytrimethylene terephthalate false twisted yarn without the above problems.

In the research to achieve the above object, the inventors considerably increase the intrinsic viscosity (IV) of the resin in order to compensate for this, since PTT fibers are inferior in strength and heat resistance compared to conventional polyesters, and can be discharged when manufacturing POY yarns. It was found that raising the strength and heat resistance improved, such that the POY yarn was stably combusted at a temperature of 100 ° C. or higher, and that the obtained twisted yarn showed high crimpability.

Therefore, according to the present invention, 1,3-propanediol is more than 85% in the main chain and spun polytrimethylene terephthalate having an intrinsic viscosity of 0.75 to 1.1 at a spinning speed of 2,500 to 5,500 m / min to obtain POY yarn, and drawing it. And it provides a method for producing a polytrimethylene terephthalate false twisted yarn comprising burning.

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

Polytrimethylene terephthalate used in the present production method is 1,3-propanediol is 80% or more in the main chain and has an intrinsic viscosity of 0.75 to 1.1. If the intrinsic viscosity is less than 0.75, the molecular weight is small, so the combustion process is not good, and polytrimethylene terephthalate of more than 1.1 is not preferable because the production time, especially the polymerization reaction time is long, the burden of the cost is high.

In the production of POY yarns, it is preferable to set the flux to be 2,500 to 5,500 m / min, which can make the yarn strength be 2.2 g / d or more and the maximum thermal stress temperature of 45 DEG C or more in the above discharge range. It is because it is effective in improving heat resistance. If the discharge speed is less than 2,500m / min, the strength of the yarn is inadequate and the heat resistance is insufficient, there is a disadvantage that a lot of trimming, moor occurs when burning. In addition, when the discharge rate exceeds 5,500m / min, the increase in yarn strength is no longer achieved, but rather only the failure of the spinning process.

The POY yarn thus prepared is combusted in a good state without trimming or shaving even at a temperature of 100 ° C. or more during combustion, and the obtained twisted yarn has excellent crimpability of 30% or more of crimping rate. It is preferable to adjust the flammable temperature to 200 degrees C or less as possible, because when it burns at the combustion temperature exceeding 200 degreeC, there exists a possibility that the melting of a yarn may occur.

Features and other advantages of the present invention as described above will become more apparent from the embodiments described below. Of course, the following examples are only intended to aid understanding of the present invention and are not intended to be limiting. Physical properties shown in the following Examples and Comparative Examples are measured by the following method.

◎ Crimping rate: After winding the false twisted sample with warp reel, hang one end on the scale plate and apply super load (2 / 1,000g), heavy load (1 / 10g), 1 After the minute, the length (L ₀ ) is measured. After removing the heavy load, the sample is treated in boiling water for 20 minutes and then taken out to remove the superload and dried at room temperature for 24 hours. After this, the sample is reloaded with super and heavy loads, and the length (L ₁ ) is read after 1 minute. Then immediately remove the heavy load and read the length (L ₂ ) after 1 minute. The crimp rate is calculated | required based on the following formula from the length measured as mentioned above.

◎ Intrinsic viscosity (IV): Measured using a Ubelrod viscometer in a 30 ° C thermostat after dissolving at 120% ortho-chlorophenol at 1% concentration.

◎ Thermal Stress: The thermal stress is measured by using Kanebo's thermal stress tester at a super load of 10g and a heating rate of 300 / min.

Example 1

After drying for 6 hours at 150 ℃ in a vacuum dryer using a PTT resin having an intrinsic viscosity of 0.76 was spun using a conventional spinning machine. The spinning temperature was 265 ° C. and the spinning speed was 3000 m / min. POY yarn of 115 denier 36 filaments was manufactured using a 0.3 mm nozzle. The POY yarn thus prepared was combusted at a yarn speed of 400 m / min and a combustion temperature of 150 ° C. using a disc type combustor. Physical properties and process parameters of this example are summarized in Table 1 below.

Example 2

The same procedure as in Example 1 was repeated except that PTT resin having an intrinsic viscosity of 1.0 was used and the spinning temperature was changed to 270 ° C and the flammable temperature was changed to 160 ° C.

Example 3

The same procedure as in Example 1 was repeated except that PTT resin having an intrinsic viscosity of 0.76 was used, and the spinning speed was changed to 5,500 m / min and the combustion temperature was changed to 150 ° C.

Example 4

The same procedure as in Example 1 was repeated except that PTT resin having an intrinsic viscosity of 1.0 was used, and the spinning speed was changed to 5,500 m / min and the combustion temperature was changed to 150 ° C.

Comparative Example 1

The same procedure as in Example 1 was repeated except that PTT resin having an intrinsic viscosity of 0.65 was used.

Comparative Example 2

The same procedure as in Example 1 was repeated except that PTT resin having an intrinsic viscosity of 0.65 was used and the combustion temperature was changed to 120 ° C.

Comparative Example 3

The same procedure as in Example 1 was repeated except that PTT resin having an intrinsic viscosity of 0.76 was used and the spinning speed was changed to 2,000 m / min.

[Comparative Example 4]

The same procedure as in Comparative Example 3 was repeated except that the combustion temperature was changed to 120 ° C.

TABLE 1

○…. Little or no moor

×… High incidence of cattle

As can be seen from Table 1, in the case of Examples 1 to 4 spinning the polytrimethylene terephthalate having an intrinsic viscosity of 0.75 to 1.1 at a spinning speed of 2,500 to 5,500 m / min, the comparative example deviated from the above range. Compared to the case of 1 to 4, even at a temperature of 100 ° C. or more at the time of combustion, the product is combusted in a good state without trimming or shaving.

Claims (3)

1,3-propanediol comprising at least 85% in the main chain and spun polytrimethylene terephthalate having an intrinsic viscosity of 0.75 to 1.1 at a spinning speed of 2,500 to 5,500 m / min to obtain POY yarn and to draw and stretch it Method for producing polytrimethylene terephthalate false twisted yarn. The method for producing polytrimethylene terephthalate false twisted yarn according to claim 1, wherein the twisting is carried out at a temperature of 100 to 200 캜. The method for producing polytrimethylene terephthalate false twisted yarn according to claim 1, wherein the POY yarn has a strength of 2.2 g / d or more and a thermal stress maximum temperature of 45 ° C. or more.