KR19990001119A - Polyester partially drawn yarn and manufacturing method thereof - Google Patents

Abstract

The present invention is a polyester prepared by spinning ethylene glycol by modifying ethylene glycol with terephthalic acid or an ester-forming derivative thereof to produce a polyester by adding trimethylolpropane in a ratio of 1 to 10 milliliters per gram of polymer. As regards POY, such POY has a high strength even when manufactured with high productivity, and DTY obtained by post-treatment has little wool, so that weaving is excellent.

Description

Polyester partially drawn yarn and manufacturing method thereof

The present invention relates to a polyester yarn, and more particularly, to a method for producing a polyester partially drawn yarn (POY) which is capable of high-speed spinning and minimizes the occurrence rate of cows in the stretching and the twisting process.

Recently, as the demand for polyester is soaring, research has been attempted for high-speed spinning polyester POY in order to mass produce it.

Conventionally. Prior art related to the manufacturing method of the polyester yarn by the high-speed spinning, REEZE Korean Patent Publication No. 90-1319 discloses 1 to 6 milliequivalents (meq) of trimethyl trimellitate (1 g per polyester polymer) It is proposed to improve productivity by increasing the draw ratio and increasing the winding speed by reducing the orientation of POY using TMTM). However, as in the above method, the partially drawn yarn (POY) manufactured at a discharge rate of 3000 to 4000 mpm has a low strength, so that a large amount of wool occurs in the drawing and burning process, which causes difficulty in weaving.

In addition, Reese's Korean Patent Publication No. 90-1320 discloses a method for producing POY in a straight line throughout the year by adding 10 meq or less tetraethyl silicate (TES) per gram of polyester polymer. This method makes TES easy to be oriented through stretching after yarn formation because it is hydrolyzable, but this is only possible during the year round. There is also a possibility that the yarn may change over time even after stretching, and the strength of POY is low. There is a large amount of wool in the drawing and burning process, which causes difficulties in weaving.

Therefore, the present invention is to solve the problems of the prior art, to provide a polyester POY which is produced with excellent radioactivity even at a high spinning speed of 4000 mpm or more and hardly occurs in the post-treatment process, drawing and burning process do.

In the study for solving the above problems, the use of trimethylolpropane of the general formula (1), which has not been reported in the conventional production of polyester POY, was added at a ratio of 1 to 10 meq per 1 g of polymer, and then modified at a high speed. It is surprising to know that it is possible to provide a polyester POY with excellent properties that hardly generates scars in the post-treatment drawing and burning process.

[Formula 1]

Therefore, according to the present invention, when ethylene glycol is reacted with terephthalic acid or an ester-forming derivative thereof to prepare a polyester, trimethylolpropane is added at a ratio of 1 to 10 millequivalents per gram of the polymer to be modified. A polyester POY is provided.

According to the present invention, when ethylene glycol is reacted with terephthalic acid or an ester-forming derivative thereof to prepare a polyester, trimethylolpropane is added at a ratio of 1 to 10 millequivalents per gram of the polymer to be modified, and the modified polyester Provided is a method for producing a polyester POY comprising the step of spinning at high speed.

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

The present invention is characterized in that POY is produced from polyester modified by incorporating trimethylolpropane (hereinafter referred to as TMP) in the reaction of ethylene glycol and terephthalic acid or its ester-forming derivative. TMP is preferably dissolved and added to catalyzed glycol in order to easily participate in the reaction without volatilization during polymerization. At this time, it is appropriate to add the amount of 1 to 10 meq per 1g modified polyester. When the amount of TMP is less than 1 meq per 1g of polymer, the effect for improving the productivity is somewhat insufficient. When the amount of TMP is more than 10 meq, the POY spinning processability is poor and the occurrence of the swell after the combustion process increases the practicality.

Here, the term equivalent (eq) refers to the molecular weight of the unreacted functional group because the chain branching agent (CBA) has a trivalent or higher functional group and two functional groups are required to continuously produce polyester. The value obtained by dividing is shown. For example, trimethylolpropane has 3 functional groups and a molecular weight of 134 g, so that 1 equivalent (eq) is 134 g. That is, in the present invention, the content of TMP is 1 to 10 meq per 1 g of polymer, so when expressed in grams, the amount of TMP is 1.34 × 10 ⁻⁴ to 13.4 × 10 ⁻⁴ g per 1 g of polymer.

According to the present invention, the modified polyester by the addition of TMP is spun at 4000 to 5500 mpm at a speed of 2.5 g / de or more, and a POY having an elongation at break of 50 to 150% is obtained. In the process, DTY was produced with high productivity with little generation of cows when treated at 700 to 1000 mpm and elongation ratio of 1.5 to 2.0, and the produced DTY showed very good weaving.

Features and other advantages of the present invention as described above will become more apparent from the following examples. However, the following examples are not intended to limit the present invention only.

<Examples 1 to 3>

1000 kg of terephthalic acid, 418 kg of ethylene glycol and 150 g of cobalt acetate were dissolved in ethylene glycol, and TMP was dissolved in an amount as shown in Table 1 below as a chain branching agent, and then introduced into an esterification reactor. The esterification reaction was carried out by raising the temperature, and after completion of the reaction, quantitative antimony and phosphate were added, and TiO ₂ was condensation-polymerized by adding 0.3 wt% of the polymer. The intrinsic viscosity (IV) of the modified polyester produced by condensation polymerization was 0.63 g / dl.

The polymer obtained was dried, melt spun at 300 ° C., and wound up at a rate of 4200 mpm to prepare POY. The manufactured POY has a dead speed of 700mpm. DTY was manufactured by stretching and burning at a draw ratio as shown in Table 1 at a heater temperature of 160 ° C.

POY strength, elongation and productivity growth rate of Examples 1 to 3 were measured by the following method and are shown in Table 1 below.

productivity … Expressed as a function of the spinning speed and the draw ratio was calculated by the following equation (1).

[Equation 1]

Rainfall The number of filaments broken at the sock end of the twisted yarn bobbin is visually calculated and expressed as the total weight of the yarn wound on the bobbin.

POY strength and elongation… Measured with Universal Testing Machine (UTM).

<Comparative Example 1>

The same procedure as in Example 1 was repeated except that a linear polyester having an intrinsic viscosity of 0.63 prepared in a continuous polymerization process without using a chain branching agent was used.

<Comparative Example 2>

The same procedure as in Example 1 was repeated except that tetraethylsilicate (TES) was used as chain branching agent, 4.8 meq per gram of polymer.

<Comparative Example 3>

The same procedure as in Example 1 was repeated except that trimethyl trimellitate (TMTM) was used as the chain branching agent, 4.3 meq per gram of polymer.

Table 1

division Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Chain branching agent (meq) TMP (1.5) TMP (3.7) TMP (7.5) - TES (4.8) TMTM (4.3) Spinning speed (mpm) 4200 4500 5000 3300 3600 3660 POY strength (g / de) 3.1 3.6 2.6 3.0 2.21 2.14 POY elongation (%) 110 103 120 110 138 134 Elongation Ratio ⁽¹ ) 1.63 1.56 1.56 1.56 1.63 1.56 Productivity growth 33.0 36.4 51.5 0 18.5 10.9 Denier 115 115 115 115 249 248

* Note 1: Elongation ratio of 30% elongation in DTY properties and less than 0.5 cows / lb.

As can be seen from Table 1, the polyester POY of Examples 1 to 3 obtained by winding at a relatively high spinning speed is superior in strength and excellent in productivity compared to the POY of the comparative example prepared at a low spinning speed. .

Claims (3)

In a polyester partially drawn yarn formed by spinning a modified polyester obtained by adding a chain branching agent to a reaction of ethylene glycol and terephthalic acid or an ester forming derivative thereof, the modified polyester is trimethylolpropane as a chain branching agent. Partially stretched polyester, characterized in that the modified to be added in an amount of 1 to 10 milliliter equivalents per 1g of polymer. In the method for producing a polyester partially drawn yarn, when a polyester is prepared by reacting ethylene glycol with terephthalic acid or an ester-forming derivative thereof, trimethylolpropane is added at a ratio of 1 to 10 milliliters per gram of polymer to modify the polyester. Method for producing a polyester partially drawn yarn comprising the step of producing, and spinning the modified polyester at high speed. The method for producing a polyester partially drawn yarn according to claim 1, wherein the spinning speed is 4000 to 5500 mpm.