KR930011319B1 - Process for preparation of sea-island type conjugated fiber - Google Patents

Abstract

The method is characterized by composite spinning: sea- component of modified polyester, obtained by adding organic sulfonic acid metal salt, 0.1-5 wt.% (against polyester) of the compound of the formula (HO(-R-O-)nH (where R: aromatic hydrocarbon group of valence 2, or aliphatic hydrocarbon group of carbon number of 2-10, n; 8-160), 1-50 equivalent (against 100 equivalent of organic sulfonic acid metal salt) of the compound of the formula (where M: alkali metal) to polyester resin; and island component of polyamide for the regular fiber.

Description

Method of manufacturing island-in-the-sea composite fiber

1 is a cross-sectional view of the island-in-the-sea composite fiber of the present invention.

* Explanation of symbols for main parts of the drawings

A: sea component b: island component

The present invention is to produce a island-in-the-sea composite fiber by uniformly arranging two types of polymer melts which are incompatible with each other on the cross-section in the form of islands and seas, and continuously forming the islands and seas composites in the axial direction of the fibers. The method relates to a method, more specifically, to spinning and stretching using a polyester having excellent dissolution rate due to alkali as well as excellent radioactivity and stretchability as a sea component, and a polyamide having no compatibility with polyester as a sea component. The present invention relates to a method for producing an island-in-the-sea composite fiber in which a polyamide thin-fiber yarn is obtained by alkali-reducing the sea component polyester.

The island-in-the-sea microfiber yarn is a high value-added product that can manufacture artificial leather and high-quality suede products, and various methods have been proposed regarding its manufacturing method.

As island-in-the-sea composite fibers, polyesters and copolymers thereof such as polyethylene terephthalate, polyamides and copolymers such as nylon 6, polyolefins and copolymers such as polyethylene, etc. have been used. Polystyrene and its copolymers Polyethylene and its copolymers, polyvinyl alcohol copolymers and the like have been used.

However, when the polyester copolymer is used as the sea component, if the polymer used as the island component is compatible with the polyester, the cross section may be poor due to similar behavior, and the sea component by alkali weight loss treatment may be used. It is difficult to obtain the desired product because the components are processed together when removing the.

Therefore, by using a polyamide as an island component and using a modified polyester having excellent spinning and stretching properties as a sea component while being easily eluted during alkali weight loss treatment, it is possible to produce radiation stretch properties that can be produced during conventional complex spinning of polymers having incompatibility with each other. By supplementing the defects, it was possible to obtain an excellent four-sided section and a final higher order product. For example, Japanese Patent Laid-Open Nos. 56-53226 and 63-159525 propose a method of using a modified polyester copolymerized with an organic sulfonic acid metal salt as an elution component, but organic sulfonic acid metal salts are copolymerized with a small amount of polyester. In this case, it is difficult to remove the required amount of the eluting component because of the slow dissolution rate due to alkali, and it is easy to remove the eluting component because of the high dissolution rate when the copolymer is excessively copolymerized, but has a disadvantage in that radioactivity and elongation are poor.

Accordingly, an object of the present invention is to provide a method for producing an island-in-the-sea composite fiber that is not only easy to remove the eluting component but also excellent in radioactivity and stretchability.

In order to achieve the above object, in the present invention, a polyester resin modified with an organic sulfonic acid metal salt, a polyalkylene glycol and an alkali metal salt is used as a sea component and a general spinning of a polyamide resin as a island component to easily remove the elution component. And the island-in-the-sea composite fiber excellent in the radioactivity and stretchability was prepared.

The present invention will be described in more detail as follows.

Organic sulfonic acid in a polyester formed by polymerizing a polyamide-based water-insoluble polymer and polymerizing an aromatic dicarboxylic acid or ester-forming derivative thereof and at least one alkylene glycol or ester-forming derivative thereof having two or more carbon atoms In the process of preparing a copolyester by adding a metal salt, the island-in-the-sea composite fiber is prepared in a conventional manner by using a modified polyester prepared by adding a compound represented by the following formulas (I) and (II) Prepared.

Here, R is a divalent aromatic hydrocarbon group or an aliphatic hydrocarbon group consisting of 2 to 10 carbon atoms, n is 8 to 160, and M is an alkali metal.

In order to obtain a satisfactory elution rate and excellent radioactivity and elongation during the weight loss treatment with aqueous alkali solution, 0.1 to 15% by weight, preferably 1 to 5% by weight of the component of the general formula (I) is added. . If less than 0.1% by weight, it is difficult to expect the effect of improving the stretchability, and if it exceeds 15% by weight, the mechanical properties are greatly reduced by phase separation. The component of general formula (II) is determined by the equivalence ratio with respect to the organo sulfonic acid metal salt thrown in, 1-50 equivalent with respect to 100 equivalent of organic sulfonic acid metal salt, More preferably, 5-25 equivalent is added. By adding in the above range, the softening point and the viscosity are improved, so that drying, spinning and physical properties are improved.

The organic sulfonic acid metal salts used in the present invention include dimethyl sodium 5-sulfoisophthalate, sodium 3,5-dimethyl sulfonate dimethyl potassium 5-sulfoisophthalate, di-n-pentyl lithium 3-sulfoterephthalate, dimethyl sodium 2,6-dimethyl-5-sulfoisophthalate, and the like. Specific examples of the compound of general formula (I) include polyethylene glycol, polypropylene glycol, polytetramethylene glycol, and polyethylene propylene glycol having a molecular weight of 400 to 6000. As the compound (II), one selected from the group consisting of lithium hydroxide, sodium hydroxide, potassium hydroxide, rubidium hydroxide, cesium hydroxide, or a mixture thereof can be used.

Using the modified polyester resin as the sea component and the general polyamide resin as the island component, the island-in-the-sea composite fiber is supplied by a constant ratio in the spinneret device of the island-in-the-sea composite fiber. In this case, the ratio of sea component / island component may be applied in the range of 5/5 to 1/9, but the lower the ratio of sea component, the more advantageous in the final processing process and cost.

After the island-in-the-sea composite fiber obtained by the present invention is woven, knitted or non-woven, the sea component is eluted by ordinary alkali reduction processing to obtain ultrafine fibers having a level of 0.001 to 0.05 denier.

The following examples and comparative examples further illustrate the present invention, but the examples and the comparative examples do not limit the scope of the present invention. The parts and percentages mentioned in the examples and comparative examples refer to parts by weight and weight percent.

Example 1

178.3 parts of terephthalic acid, 117.6 parts of ethylene glycol, 0.2 parts of zinc acetate, 0.06 parts of lithium acetate, 23.7 parts of 5-sodium dimethylsulfoisophthalate and 4 parts of polyethylene glycol having a molecular weight of about 4000 were put into a glass flask and subjected to transesterification. After 0.2 parts of sodium hydroxide was added and the reaction was completed, the reaction mixture was transferred to a polymerization tube, and 0.03 parts of phosphoric acid and 0.06 parts of antimony trioxide were mixed. The mixture was heated to 240 ° C. and depressurized from normal pressure. After condensation polymerization for 3 hours at, the polymer is discharged in water at normal pressure. The average molecular weight of the polymer obtained here was 20,000, the intrinsic viscosity was 0.60 dl / g and the melting point was 240 ° C.

The polymer obtained above was spun as sea component, polyamide for general fibers as a island component, and the ratio of the two components was 2/8. At this time, the number of spinnerets was 37 pieces, and the spinning speed was 1000m / min. According to the general drawing method of polyester fiber, the draw ratio is 3.5 and the drawing speed 800m / min to make a 75d / 36f stretched yarn, and then made a circular knitting machine using a circular knitting machine and then 10 minutes in a 95% NaOH 5% solution Alkali weight loss treatment. As a result of observation by electron microscope, the sea component was completely eluted and the fineness of the island component of the composite yarn was 0.039 denier. The properties of the final composite yarn were evaluated and the results are shown in Table 1.

Example 2

It carried out similarly to Example 1 except having set discharge ratio of polyester and polyamide to 1/9, and final drawn yarn to 50d / 36f. The spinning and drawing properties were good and the fineness of the island component of the composite yarn after sea component removal was 0.032 denier. The properties of the final composite yarn were evaluated and the results are shown in Table 1.

Comparative Example 1

Except that 4 parts of polyethylene glycol having a molecular weight of 4000 was not added, it was carried out in the same manner as in Example 1, and the intrinsic viscosity of the thus produced copolyester was 0.55 dl / g. The island-in-the-sea composite fiber obtained by using this copolyester had poor elongation in the stretching step after spinning. The properties of the final composite yarn were evaluated and the results are shown in Table 1.

Comparative Example 2

Except that 0.2 parts of sodium hydroxide was not added, it was carried out in the same manner as in Example 1, and the intrinsic viscosity of the copolyester thus produced was 0.50 dl / g. The islands-in-the-sea composite fiber obtained using this copolyester had poor radioactivity and the elution state of the sea component after aqueous alkali solution treatment was also bad. Table 1 shows the characteristics of the final composite yarn.

TABLE 1

* Polymer property: 2000-2500 poise-good, melt less than 2000 poise or more than 2500 poise-poor when measuring melt viscosity (270 ℃)

Radioactive: 90% or more of full bobbin-good, less than 90% -defective

Elongation: trimming and incidence rate less than 2%-good, more than 2%-poor

Elution rate: Sodium hydroxide (NaOH) 5% solution Elution rate within 100 minutes when processed at 95 ℃ Elution within 10 minutes-fast, takes more than 10 minutes-slow

As can be seen from the above, the island-in-the-sea composite fiber according to the present invention has a much faster elution rate and excellent spinning and elongation property than the island-in-the-sea composite fiber to which the modified polyester resin composition containing only the organic sulfonic acid metal salt is applied. I could confirm it.

Claims (1)

1-50 equivalents of the compound represented by the following formula (I) of the organic sulfonic acid metal salt and 0.1 to 5% by weight of the polyester resin in the polyester resin, and the following general formula (II) A method for producing an island-in-the-sea composite fiber, wherein the modified polyester prepared by adding the compound represented by the compound is used as a sea component and polyamide for general fibers is used as a island component. Here, R is a divalent aromatic hydrocarbon group or an aliphatic hydrocarbon group consisting of 2 to 10 carbon atoms, n is 8 to 160, and M is an alkali metal.