KR20040012124A - Process for the production of divisible composite fiber - Google Patents

Abstract

PURPOSE: A manufacturing method of sectional type conjugate fiber is characterized by adding an additive. The manufacturing method is capable of improving productivity, spinning processability, false-twist processability and dyeing property. CONSTITUTION: The sectional type conjugate fiber is obtained by the steps of: preparing a mixture of 95-99.9wt% of polyester and 0.1-5wt.% of polymethyl methacrylate or polystyrene as a first ingredient; preparing a mixture of 95-99wt.% of nylon 6 or nylon 66 and 0.1-5wt.% of polystyrene as a second ingredient; and then spinning the mixtures at 3000-6000m/min. A ratio of the first ingredient and the second ingredient is 65-90wt.% : 35-10wt.%.

Description

Process for the production of divisible composite fiber

The present invention relates to a method for producing a split composite yarn having excellent productivity and excellent post processability.

Conventional polyester / polyamide split composite yarns are produced by complex spinning of polyester and polyamide components, and the composite yarns thus produced are usually denier with a single yarn fineness of 0.2 denier through a combusting process of dividing the two components. It is manufactured with the following ultrafine yarn.

Split type composite yarns are manufactured and used as high value-added products such as cleaners and artificial leathers because of their excellent tactile feel.

It is required to develop a technology for producing high quality composite yarns having excellent dyeing properties by increasing the productivity of such split composite yarns and increasing post-processing properties such as flammable processes.

The polyester has an elongation at which the elongated semi-drawn yarn is produced as the spinning speed increases, and as a result, the post-processing draw ratio is also reduced, so that the effect of increasing productivity with increasing spinning speed is negligible.

However, in order to suppress the orientation during the spinning process by adding a heteropolymer to increase the productivity of the polyester, despite the increase in the spinning speed, the elongation of the manufactured yarn does not decrease, and thus a high productivity increase effect can be obtained.

This is because the spinning speed and elongation of polyester yarn are inversely proportional.

As described above, US Pat. No. 4,609,710 describes a method of preparing a semi-stretched yarn having an elongation of 120% or more at 1,500 to 8,000 m / min by adding an additive such as polymethyl methacrylate. EP 0.080.274 describes a method for increasing productivity by adding incompatible polymers polyethylene, polyethylene glycol, polyamide and the like to polyester.

The method of adding a heteropolymer to the polyester has an advantage of increasing productivity, but depending on the heteropolymer to be added, there is a problem that deterioration of spin workability or deterioration of dyeing and physical properties may occur.

In addition, a method of adding a heteropolymer such as a liquid crystal polymer in order to increase the productivity of the polyamide is also known (US Patent No. 4,442,057).

However, unlike polyester, polyamide has a moderate decrease in elongation due to an increase in spinning speed, so that the addition of heteropolymers does not have a significant effect of increasing productivity compared to polyester.

In addition, polyamide, like polyester, may reduce the spinnability depending on the heteropolymer added.

That is, as a method of improving the productivity of the split type composite fiber composed of polyester and polyamide, a method of increasing productivity by increasing the spinning speed is generally known, but the split type composite fiber of polyester and polyamide is known. Due to the elongation reduction effect of increasing the spinning speed, which is a characteristic of polyester, which has a high weight ratio, the productivity improvement effect is decreased due to the increase of spinning speed. Problems with reduced fairness and dyeing can also occur.

The present invention provides a method for producing a polyester / polyamide split composite fiber at a high spinning speed to improve productivity by adding a heteropolymer, wherein spinning workability, flammability, and post-processing were problems. Technical problems are solved to solve poor processability and deterioration of dyeability.

1 is a manufacturing process schematic diagram of the present invention.

2 (a) and 2 (c) are enlarged cross-sectional views of the divided composite yarn.

Hereinafter, the present invention will be described in detail.

The present invention is characterized by improving the radioactivity, post-processing and dyeing properties by appropriately adjusting the amount of additives added.

The present invention adds 0.1 to 5% by weight, preferably 0.1 to 2% by weight of polymethyl methacrylate or polystyrene as an additive to 95 to 99.9% by weight of polyester melt melt as the first component, and polyamide as the second component. (Polyamide 6 or Polyamide 66) To the 95 to 99.9% by weight melted melt, polystyrene is added 0.1 to 5% by weight, preferably 0.1 to 2% by weight as an additive, and then spun by conventional methods to produce a spun composite yarn That's how.

In this case, when more than 5% by weight of polymethyl methacrylate or polystyrene is added to the polyester, the workability is poor, the dyeability of the yarn is also reduced and the manufacturing cost is also increased.

In addition, when less than 0.1% by weight is added, there is almost no effect of improving productivity.

In addition, when more than 5% by weight of polystyrene is added to the polyamide, the spinability is poor, and when it is less than 0.1% by weight, there is little productivity improvement effect. There is a problem.

In this case, the ratio of the first component and the second component is 65 to 90% by weight to 35 to 10% by weight, and the spinning speed is 5,000 m / to 3,000 m / min or more and 6,000 m / min or more preferably 3,600 m / min or more. Is up to a minute.

In addition, the spinning speed should be at least 3,000 m / min, which is the general speed of semi-stretched yarns, and if it exceeds 6,000 m / min, winding is difficult due to an increase in the number of trimming threads.

In order to inject the additive into the polyester melt melt, a side batching facility (FIG. 1) is used or a master batch in which 10 to 35% by weight of the additive is dispersed in a conventionally used polyester (polyethylene terephthalate) or polybutylene terephthalate is prepared. In order to add the desired amount to the desired content, and to add the additive to the polyamide melted melt, use a side feeding equipment or a suitable amount of the master batch in which 10 to 35% by weight of the additive is dispersed in the polyamide.

If the content of the additive contained in the master batch is less than 10% by weight, it is uneconomical, and if it exceeds 35% by weight, dispersibility is not good.

In the form of split composite yarn, the first component is branched radially from the center of the cross section of the composite fiber so as to form a wedge toward the center, and the second component is manufactured so as to be alternately arranged between the first component. Divided composite yarn is manufactured by using 8 to 32 wedges ((a) (b) and (c) in FIG. 2).

The semi-stretched yarn of the split composite yarn of polyester / polyamide thus produced is stretched or flammable at a draw ratio and temperature sufficient to express the desired physical properties (tensile strength properties) of the yarn to prepare a split composite fiber.

The draw ratio of conventional polyester / polyamide split composite yarns is from 1.4 to 1.7 and the temperature is from 140 ° C to 165 ° C.

Polymethyl methacrylate or polystyrene as a heteropolymer in polyester and polystyrene in polyamide were added in an appropriate amount to prevent elongation of the composite yarn due to the increase of spinning speed, thereby increasing productivity. The reduction of post-processability such as workability and reduction of dyeing uniformity were prevented.

The following examples are provided to aid the understanding of the invention and do not limit the scope of the invention.

Examples 1-3 and Comparative Examples 1-3

Table 1 shows the physical properties of the divided composite yarn semi-drawn yarn obtained by changing the content of polymethylmethacrylate or polystyrene in polyester and the content of polystyrene in polyamide (polyamide 6).

Polyester has a spinning temperature of 290 ° C, polyamide has a spinning temperature of 265 ° C, spinnerets with 8 splits, a diameter of 0.23mm (36 holes), and a cold wind speed of 0.4m / sec. The discharge amount was adjusted so that the ratio of polyester / polyamide was 75/25 weight ratio, and spun at a spinning speed of 4,500 m / min.

The undrawn yarn was twisted at a draw ratio of 1.55 under conditions of a heater temperature of 155 ° C. and a drawing speed of 500 m / min to prepare a twisted yarn of split composite yarn.

The results are shown in Table 1.

<Measurement method>

The dyeability of the split composite yarn was determined as follows using a sample in which the yarn was knitted to have a length of 20 to 30 cm with a circular knitting machine.

Dyeing test: Disperse dye Kow-Navy (S Type) was made with dye concentration 1% owf, and then prepared with 1g / l dispersant (VGT), pH 4.5∼5.5 (acetic acid), liquid ratio 1:15, and dyeing temperature at 30 ℃. The temperature was uniformly increased to 1 ° C./minute up to 125 ° C. and maintained at 125 ° C. for 30 minutes.

Dyeing uniformity: After dyeing the sample is sufficiently dried, a white plate was inserted to visually determine the dyeing grade.

The grade of general yarn was judged as normal, and it compared with this, and evaluated stepwise by dividing into the case where it is very excellent, excellent, and poor.

<Table 1>

division unit Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 polyester Polymethylmethacrylate Content weight% One 0 One One 0 0 Polystyrene Content weight% 0 2 0 0 2 0 Polyamide Polystyrene Content weight% 2 2 One 0 0 2 Semi-extended Physical Properties burglar g / d 2.7 2.6 2.6 2.5 2.5 3.6 Shinto % 135 118 125 132 112 75 Fairness and dyeing Radiation fairness - ◎ ◎ ○ ○ ○ ○ Flammability Fairness - ◎ ◎ ◎ ○ △ × Dyeing uniformity - ◎ ○ ○ △ △ △ Increased productivity The presence or absence U U U U U radish

(◎: very good, ○: excellent, △: normal, ×: poor)

As shown in Examples 1, 2, and 3 of Table 1, when a suitable amount of polymethyl methacrylate or polystyrene is added to polyester, and an appropriate amount of polystyrene is added to the polyamide, the type is divided and excellent in uniformity in dyeing uniformity. It was possible to produce a composite fiber.

In Example 1 and Comparative Example 1, Example 1 is a case in which 1% by weight of polymethyl methacrylate is added to polyester, and 2% by weight of polystyrene is added to polyamide, which shows excellent spinning processability, flammability, and dyeing uniformity. And although the productivity is improved, Comparative Example 1 is a case in which only 1% by weight of polymethyl methacrylate is added to the polyester, the productivity is improved, but the flammability and dyeing uniformity is not very good.

In Comparative Example 2, only 2% by weight of polystyrene was added to the polyester and no additives were added to the polyamide. Similarly, the productivity was improved, but the flammability and the dyeing uniformity were not so good.

Comparative Example 3 is a case in which 2% by weight of polystyrene is added only to polyamide, and polymethyl methacrylate or polystyrene is not added to polyester, and thus there is no productivity improvement effect and does not exhibit semi-stretched physical properties at high speed of 4,500 m / min. It shows poor flammability.

The present invention can produce excellent spinning processability, flammability processability and dyeing uniformity when the polyester / polyamide split composite yarn is produced at a high speed of 3,000 to 6,000 m / min by adding a heteropolymer.

Claims (6)

A process for producing a split composite yarn comprising the process of preparing a mixture of polyester and polymethyl methacrylate or polystyrene as a first component and a mixture of polyamide and polystyrene as a second component. The method of claim 1, wherein the first component is 95 to 99.9% by weight polyester, 0.1 to 5% by weight polymethyl methacrylate or polystyrene, the second component is 95 to 99% by weight nylon 6 or nylon 66 , 0.1 to 5% by weight is a polystyrene, the method for producing a divided composite yarn. The method for producing a split composite yarn according to claim 1, wherein the proportion of the second component in the whole composite fiber is 10 to 35% by weight. The method of claim 1, wherein the spinning speed of the split composite yarn is 3,000 m / min or more and 6,000 m / min or less. The wedge of claim 1, wherein the first component is branched radially from the center of the cross section of the composite fiber so as to form a wedge toward the center, and the second component is arranged alternately between the first component and the wedge is the first component. Method for producing a split composite yarn characterized in that the number of 8 to 32. Divided composite yarn prepared by the method of any one of claims 1 to 5.