KR0120015B1 - Manufacturing method for silk-like polyester fiber of two component - Google Patents

Abstract

With terephthalic acid, ethylene glycol as a main ingredient, a joint polymerized polyester chip composed of isophthalic acid and hexylene glycol is made from a 1st element of which specific viscosity is 0.67. A common polyester chip of which main ingredient is terephthalic ethylene glycol with the specific viscosity of 0.65 is made from the 2nd element, they are dried in each drying system, melted in the melting facilities, having the 1st element melted at the 270 degree C and the 2nd element at the 285 degree C. Using the special nozzles, they are spun into an undrawn yarn, drawn in a hot roller 2.8 times at 85 degree C, subject to at 130 degree C and made a silk-like compound yarn which has the round and y shaped cross sections.

Description

Manufacturing method of two-component silk like polyester fiber

1 is a cross-sectional view of a two-component silklike fiber according to the present invention.

The present invention relates to a method for producing a two-component silk-like fiber having improved functionality and high shrinkage as a fabric material having a unique touch of silk.

Conventionally, two kinds of filament yarns having different shrinkages are mixed or manufactured by compound spinning in order to give polyester fibers a high bulkiness and have a good feel like silk. The method of expressing the was used, the filament yarn having a higher shrinkage than the conventional polyester filament yarn as a way to achieve the purpose has been developed and commercialized.

In preparing the silky composite yarn, the first polymer is generally polyethylene terephthalate or acid dye salt-containing polyethylene terephthalate having an intrinsic viscosity of about 0.65, and the second polymer which becomes a part expressing high shrinkage iso The addition of crystallization inhibitors such as phthalic acid and phthalic anhydride to form a large number of amorphous regions in the filament internal structure to express shrinkage difference is used.

However, the high shrinkage polymer used as the second polymer of the prior art is uneven in physical properties due to the uneven distribution of high polymerization, which causes the yarn to be defective in the spinning step. Most of the original shrinkage characteristics are lost due to the influence of temperature and tension during operation of the equipment, so that the difference in shrinkage is poor at the stage of the final fabric after weaving, refining, and dyeing.

The present invention has been made to improve the problems of the prior art as described above, to minimize the loss of shrinkage characteristics due to sizing temperature or tension and to express it in the dyeing process to overcome the problems of the conventional silky composite yarn At the same time, the present invention relates to a method for producing two-component silklike polyester fibers with improved spinning and elongation by suppressing shrinkage characteristic expression in the spinning step.

The present invention specifically describes a polyester polymer prepared using terephthalic acid and ethylene glycol as a main component and isophthalic acid and hexylene glycol as a copolymer component for the production of a highly shrinkable polyester used as a second polymer. Composite spinning with a general polyester polymer to produce a highly shrinkable polyester with a shrinkage difference of 5-12% at 100 ℃ boiling water, 10-20% at 120 ℃, dry heat shrinkage is characterized by 5 to 120 ℃ -11%, 7-16% at 200 ° C and the maximum heat shrinkage stress temperature (Tmax) and maximum heat shrinkage stress during heating and heating of the filament yarn at a heating rate of 20 ° C / min. max), heat shrinkage stress at 200 ° C ( The value of 200 is characterized by satisfying the following conditions (1), (2) and (3).

In the production of the conventional two-component silk-like polyester filament yarn, the difference in shrinkage between two minutes is less than 5% at 100 ℃, less than 10% at l20 ℃ is generally the fabric produced when the fiber is made of fabric Even if it is treated in boiling water of refining temperature condition of l00 ℃ or 120 ℃, it does not have enough shrinkage expression, so it lacks tactile feeling and it is not possible to obtain the desired level of product, while the difference in shrinkage between two components exceeds 12% at 100 ℃. , 20% at 120 ° C. results in poor mechanical strength of the high shrinkage filament portion of the two components, resulting in poor radioactivity and elongation. Less shrinkage occurs and there is a drawback of stretching again due to tension during dry heat treatment.

However, the high shrinkage filament yarn developed by the present invention has a very high maximum heat shrinkage stress value of 0.6 g / de or more and a temperature of expression of the maximum heat shrinkage stress is also 120 ° C or more. The maximum heat shrinkage temperature is the temperature at which proper shrinkage occurs easily. If this temperature is less than 120 ℃, especially less than l00 ℃, the shrinkage property is lost due to heat and tension during the sizing process before weaving, so that the final processed fabric feels poor. do.

The heat shrinkage stress value at 200 ℃ of dry heat is a measure that can cause more shrinkage when heat-setting the two-component silk-like polyester filament after weaving the woven fabric. The larger the value, the better the feel on the final fabric. Will be.

Co-polyester expressing high shrinkage in the two-component silklike polyester filament of the present invention is terephthalic acid and ethyllan glycol as the main component, isophthalic acid based on the total acid component, 3-8 mol%, hexylene glycol all glycol It is prepared by copolymerizing in the range of 5-10 mol% of the component. The use of isophthalic acid and hexylene glycol is characterized by suppressing the crystallization of each component, isophthalic acid is bound to the bent structure during copolymerization, hexylene glycol inhibits crystallization by the structure having a bulky property in the side chain It seems to play a role, and when both copolymerization components are copolymerized at an appropriate ratio, the optimum shrinkage characteristics are exhibited depending on the treatment temperature. When isophthalic acid is used in less than 3 mol% of the total acid component and hexylene glycol is used in less than 5 mol% of the total glycol component, it is not possible to obtain the effect by the manufacturing method from the prepared two-component polyester filament. When more than 8 mol% of the acid component and hexylene glycol is used in excess of 100 mol% of the total glycol component, the mechanical strength of the manufactured filament yarn is severely deteriorated, which causes difficulty in complex spinning with general polyester.

The general polyester of the two-component polyester filament of the present invention uses an intrinsic viscosity of 0.64-0.65 measured in a 25 ° C. ortho chlorophenol solvent, and in the case of a copolyester with shrinkage property, the intrinsic viscosity is 0.65- 0.70 is good. If the intrinsic viscosity is less than 0.65, it is difficult to increase the heat shrinkage stress, and if the intrinsic viscosity exceeds 0.70, peeling is likely to occur during fabric manufacture.

The two polymers described above are spun at a speed of 1600m / min by using a separate spinning facility and a combined spinning facility equipped with a melting facility to make undrawn yarn, and the temperature is above 75 ℃, preferably 80-95 ℃. By stretching the undrawn yarn at a draw ratio of 2.5 to 3 times at the stretching temperature of, the birefringence may have an orientation of 160 × 10 ⁻³ or more, and the heat treatment is performed at a temperature of 120 ° C. or more (preferably 120-150 ° C.). In the case where the stretching temperature is less than 75 ° C., even if the non-shrinkage rate is high, the dry heat shrinkage rate is not high after the non-shrinkage, and there is a problem in that the shrinkage characteristics are nonuniform.

By stretching the birefringence of the manufactured filament yarn to have a value of 160 × 10 ^-3 or more and heat-treating it at a temperature of 120 ° C. or higher, it increases the stability against heat and tension during weaving and dyeing, and easily adjusts the shrinkage rate without great difficulty in the work process. It becomes possible to express a unique touch.

Hereinafter, the present invention will be described in more detail with reference to Examples.

Example 1

Terephthalic acid is copolymerized polyester chip with intrinsic viscosity 0.67, obtained by copolymerizing 6 mol% of isophthalic acid and 6 mol% of hexylene glycol as the main component, terephthalic acid and ethyllan glycol as the main component, and terephthalic acid as the first component. , With ethylene glycol as the main component and a general polyester chip with an intrinsic viscosity of 0.65 as the second component, dried in each drying apparatus, and then in a separate melting facility, the first component at 270 ℃ and the second component at 285 ℃ After melting, using a special spinneret in a single spin block, 12 filaments were spun high filaments and 12 filaments were made of ordinary polyester and spun at a spinning speed of 1600 m / min. The unstretched yarn was stretched 2.8 times under the condition of hot roller 85 ° C. and heat-treated at 130 ° C. to produce a silklike composite yarn having a circular and Y-shaped cross section of 50 denier / 24 filaments. After sizing the yarn to attach 6% by weight of solids to polyester, 75% denier / 72 filament ordinary polyester yarn was used as the weft yarn, and a plain fabric having a density of 220 bones / inch × 100 bones / inch was used. It was then treated for 30 minutes in 98 ° C hot water containing 0.5% sodium hydroxide, and after scouring presetting at a temperature of 180 ° C, it was dyed for 1 hour with a disperse dye at 130 ° C. The product obtained was evaluated by the skilled person for touch and appearance, and the results are shown in Table 1.

Comparative Example 1

Isophthalic acid was 4 mol% of the total acid component and hexylene glycol was carried out in the same manner as in Example 1 with 2 mol% of the total glycol component, and the results are shown in Table 1.

Comparative Example 2

Isophthalic acid was carried out in the same manner as in Example 1 with 11 mol% of the total acid component and hexylene glycol as 11 mol% of the total glycol component, and the results are shown in Table 1.

Comparative Example 3

The undrawn yarn obtained by spinning was heated in the same manner as in Example 1 except that it was heated at 70 ° C. under a hot roller, and the results are shown in Table 1.

Comparative Example 4

The same process as in Example 1 was carried out except that the undrawn yarn obtained by spinning was stretched 1.8 times, and the results are shown in Table 1.

Comparative Example 5

The unstretched yarn obtained by spinning was heat-treated in the same manner as in Example 1 except that it was heat-treated at 80 ° C. The results are shown in Table 1.

Example 2

Copolymerized polyester chip with intrinsic viscosity 0.68 obtained by copolymerizing terephthalic acid and ethylene glycol as main component, isophthalic acid as 6 mol% of total acid component and hexylene glycol as 5 mol% of all glycol component as first component Was carried out in the same manner as in Example 1, and the results are shown in Table 1.

Example 3

Terephthalic acid and ethylene glycol are the main components, isophthalic acid is 6 mol% of the total acid component and hexylene glycol is copolymerized polyester chip of intrinsic viscosity 0.68 obtained by 8 mol% of the total glycol component as a first component After drying in a drying apparatus, this undrawn yarn was drawn 2.54 times under a hot roller of 87 ° C. and heat treated at 135 ° C. to obtain 50 denier / 24-pin ramen yarns. Proceed as in Example 1, the results are shown in Table 1.

Where IPA = isophthalic acid, HG = hexylene glycol

Tmax: maximum heat shrinkage temperature (℃)

max: maximum heat shrinkage stress (g / de)

200 ℃: Heat Shrinkage Stress at 200 ℃ (g / de)

The texture of fabric is divided into ○ (excellent), △ (normal) and × (poor).

Claims (3)

Copolymer poly with the intrinsic viscosity of 0.65-0.70 obtained by using terephthalic acid and ethylene glycol as main components, isophthalic acid as 3-8 mol% of the total acid component, and hexaglycol as the copolymerization component within the range of 5-10 mol% of all glycol components. The ester is used as the first component, and the general polyester with the intrinsic viscosity of 0.64-0.65 is used as the second component. After passing through the drying apparatus and the melting apparatus, spinning is carried out at a speed of 1300-1600 m / min through special detention to obtain undrawn yarn. After the obtained, the unstretched yarn is stretched to 80-95 ℃ and heat treated at a temperature of 120-150 ℃ characterized in that the manufacturing method of the two-component silk line polyester fibers. The method of manufacturing a two-component silk like polyester fiber according to claim 1, wherein the stretching of the undrawn yarn is performed such that the birefringence of the manufactured filament yarn has a value of 160 × 10 ⁻³ or more. The method of producing a two-component silk like polyester fiber according to claim 1, wherein the unstretched yarn is stretched at a stretch ratio of 2.5-3 times when stretched at 80-95 ° C.