KR890002175B1 - Management method of polyester filament - Google Patents

Abstract

The method treats with emulsion the surface of undrawn yarn of polyester filament dyed with carbon black in original liquid to easily remove coaqulated carbon black sticking to the surface of the filament in washing. The emulsion is composed of 10-30 wt.% polyoxy alkylene alkylether fatty acid ester, 30-50 wt.% polyether copolymerised from propylene oxide and ethylene oxide and 20-40 wt.% high grade alcohol ethylene oxide adduct.

Description

Treatment method of polyester filament yarn

The present invention provides an emulsion having a specially formulated surface of an unstretched yarn so that carbon black agglomerates attached to the fiber surface can be easily removed when washing with polyester black filament-bonded yarn filament-dyed with carbon black. It relates to a treatment method of polyester filament primary yarn to be treated with.

Polyester filament yarns which are undiluted with carbon black are generally used without weight loss processing, but in recent years, there have been some cases of alkali reduction in order to improve the lightness and feel of fabrics.

Alkali weight loss pores are usually in a heated aqueous solution of caustic soda. During this process, the hydrolyzate of the polyester fibers is produced, and the dispersed carbon black is released and adheres to the fiber surface.

Therefore, the fabric after weight loss has been washed thoroughly with water to remove this deposit.

However, the former hydrolyzate is easily washed, while the latter carbon black aggregate is firmly attached to the fiber surface by physical force so that only a part of it is removed upon washing with water and remains on the fiber surface.

In this way, the carbon black aggregates remaining on the surface of the fiber contaminate adjacent fibers in the dyeing process or the final processing process, thereby damaging the quality of the final product.

Conventionally, in order to solve such a problem, there is a method of removing by adding a nonionic surfactant to water when washing with alkali after weight loss processing, but it is difficult to control the concentration of the surfactant when applying this method to a continuous washing process. In addition, there is a problem that the manufacturing cost is increased because a large amount of the surfactant must be used.

In the present invention, when alkaline-reduced polyester filament woven yarn or knitted fabric which is undiluted with carbon black, unstretched yarn as a fiber emulsion that can easily drop off carbon black aggregates without adding a surfactant to water at the time of washing. The purpose is to provide a method for treating in a spinning process.

The present inventors have studied various factors affecting the removal of carbon black aggregates from the surface of the fiber during washing with alkaline weight loss. As a result, it has been found that the properties of the fluid treated in the spinning process have a great influence.

In other words, the fluid attached to the unstretched yarn is adsorbed and oriented on the fiber surface, and most of the fluid is adsorbed and oriented on the fiber surface and the free carbon black surface which hydrolyzed even during alkali weight loss processing. In order to remove the carbon black aggregates, it was found that it is possible to use an emulsion satisfying the following conditions.

First, the emulsion adhered in the spinning process should exert a strong surfactant in the wash liquor.

Therefore, the emulsion must have a hydrophobic group and a hydrophilic group in one molecule.

Second, the hydrophobic group should have as high carbon number as possible as the alkyl group.

Third, do not ionize in the wash solution.

Fourth, it will not decompose in the heated aqueous solution of caustic soda.

In the present invention, the polyoxyalkylene alkyl ether in the spinning process was examined as a result of examining the treatment method of the unstretched yarn having excellent removal ability of carbon black aggregates in washing with water and good passability of spinning, drawing, and removing process as the original oil. 10 to 30% by weight of polyalkyl alkylene alkylether fatty acid ester, 30 to 50% by weight of polyether, a copolymer of propylene oxide and ethylene oxide, addition of higher alcohol ethylene oxide The object of the present invention was achieved by attaching 20 to 40% by weight of water and the blended oil agent to 0.7 to 1.0% by weight of undrawn yarn with respect to the undrawn yarn weight.

In the present invention, since the polyoxyalkylene alkyl ether fatty acid ester has both a hydrophobic group and a hydrophilic group in one molecule, it is suitable for achieving the object of the present invention as compared to any conventional synthetic ester component, and in particular, both ends of the molecular chain are blocked with alkyl groups. In this case, the fiber-to-metal friction coefficient is low, and thus, the spinning, stretching, and weaving process passability of the original yarn is good.

However, in the case of blending more than 30% by weight of the above components, the generation of fatty acid metal salts is increased due to the cleavage of ester bonds in the molecule, thereby reducing the effect of the present invention. The removal effect is significantly lowered.

In the present invention, propylene oxide and ethylene oxide copolymer polyether is extremely stable in heated caustic soda solution because the molecular structure has an ether bond, and as the hydrophobic group, one or both ends of the molecular chain are added as an alkyl group or propylene oxide. Ethylene oxide is added as the hydrophilic group, and thus, an effective surfactant can be exhibited at the time of washing with water.

On the other hand, this component is more effective the more carbon number of the added alkyl group, and there is a difference in the effect of removing carbon black aggregates according to the propylene oxide and ethylene oxide addition ratio and molecular weight.

This component is effective to blend 30 to 50% by weight of components having an average molecular weight of 700 to 3000 in consideration of removal of carbon black aggregates, smoothness and thermal stability as an emulsion.

In addition, in the present invention, a high alcohol ethylene oxide adduct is a suitable component for removing the carbon black aggregates while effectively emulsifying the polyoxy alkylene alkyl ether fatty acid ester.

This component is suitable for achieving the object of the present invention because it is relatively stable in a heated aqueous solution of caustic soda and exhibits strong interfacial force upon washing with water.

This component is more effective as the carbon number of the alkyl group derived from higher alcohol is effective, and it is suitable to have a cloudy point at room temperature to achieve the objective of this invention.

It is preferable to mix | blend 20-40 weight% of compounding quantities of this component according to the compounding quantity of polyoxy alkylene alkyl ether fatty acid ester.

When the formulation is less than 20% by weight, there is a problem in the emulsion stability of the emulsion, and when the formulation is more than 40% by weight, a large amount of tar is generated on the surface of the hot plate of the drawing machine, which results in a poor process passability.

In addition, although it is not related to the removal property of the carbon black aggregates, in order to improve the passability of each of the raw yarns, 10 to 15% by weight of an alkyl sulfonate sodium salt (Sodium alkyl sulfonate) is preferably added as an antistatic agent.

When the emulsion having the composition described above is treated with polyester unstretched dye solution undiluted with carbon black, most of the carbon black aggregates are removed at the initial stage of washing, even if no additional surfactant is added to the water during washing after alkali reduction. It is possible to solve the problems caused by the use of surfactants and contamination of adjacent fibers by residual carbon black aggregates.

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

EXAMPLE

15% by weight of an aqueous emulsion of spinning emulsion (AD) having the composition ratio as shown in the following table through melt spinning the polyester primary yarn by mixing polyethylene terephthalate chip and master batch chip containing high concentration of carbon black It is attached to the undrawn yarn.

At this time, the amount of emulsion deposition is 0.7 to 1.0% by weight relative to the non-drawn yarn, a 200 denier undrawn yarn was made at a winding speed of 600 ^m / min and stretched 2.5 times at 90 degrees again to obtain a drawn yarn.

In addition, comparative spinning oil (E-G) was also treated under the same conditions as described above to obtain a stretched yarn.

The stretched yarn was knitted with a circular knitting machine, a test piece was made, alkali reduction treatment was performed, and water washing and refining were performed.

At this time, the residual refining solution was measured by the ultraviolet spectrophotometer to measure the degree of dropping of the carbon black aggregates by ultraviolet absorbance, and the refined test specimens were evaluated by assessing the color fastness of the friction contamination. As a result, the spinning emulsion according to the composition of the present invention was very excellent in preventing carbon black contamination.

[Emulsion Composition and Pollution Prevention]

Claims (1)

A method of treating polyester filament yarns, characterized in that the unstretched yarns of polyester filament yarns which are undiluted with carbon black are treated with an emulsion having the following composition. next Emulsion composition 0. Polyoxy alkylene alkyl ether fatty acid ester: 10-30% by weight 0. Polyethyl copolymer of propylene oxide with ethylene oxide: 30-50 wt% 0. Higher alcohol ethylene oxide adduct: 20-40 wt%