DE2600686A1 - METHOD OF DYING POLYURETHANE YARN - Google Patents

Description

HOFFMANN <£ SiTL ₁ K ■ PATEXJ

D-8000 MÖNCHEN 81 · ARABELLASTRASSE 4 (STERNHAUS) · TELEPHONE (069> 911037 ■ TELEX 05-29619 (PATHE)

27 645

1. DZIEWIARSTWA CENTRAL LABORATORY, Lodz / Poland

2. ZAKLADY WLÖKIEN CHEMICZNYCH "CHEMITEX-CELWISKOZA", Jelenia Gora / Poland

Process for dyeing polyurethane yarns

■ The invention relates to a method for dyeing polyurethane yarns, especially of braided polyurethane yarns.

So far, the polyurethane yarn has been wrapped with raw yarn. At times, spun-dyed yarns or dyed yarns have been used. That Spinning with such colored yarns was associated with great costs. Most commonly, covered yarns were dyed in the Finished goods in which they have been incorporated. When producing knitted goods from dyed yarns, the yarn remained in its raw state, which had a detrimental effect on the loss of goods.

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The aim of the invention is to eliminate the aforementioned shortcomings by devising a simple dyeing process .

The essence of the invention is a method for dyeing covered polyurethane yarns, which is based on the fact that the covered polyurethane yarn is wound onto perforated sleeves at constant tension, the tension approaching zero. The bobbins are then subjected to the action of a dye liquor with selected dyes and auxiliaries. The dyeing is carried out at 85 to 98 ⁰ C over a period of 30 to 9o minutes; then the bobbins are dewatered by suctioning off the excess liquor
dried.

ses dehydrated and later at 7o to 80 ⁰ C for about 12o minutes

According to the invention, the dyeing process proceeds as follows: braided polyurethane yarn is wound onto perforated sleeves. The thread tension during winding is constant and the Approximately zero value. The wound polyurethane yarn becomes the Subject to the action of a dye liquor.

At game I

Yarn dye on light colors

χ% disperse dye

0.5-1.0 g / l dispersant

0.2 - 0.5 g / l wetting agent

The dyeing time is 3o - 45 minutes at 85 - 98 ° C.

Example II

Yarn dyeing on medium and dark colors χ% acid dye or metal complex dyes

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0.5 - 1.5% leveling agent
O ₁ , 2 - ο, 5 g / l wetting agent

Acetic acid at the appropriate pH concentration depending on the type of dye used. The dyeing time is 45 - 90 minutes at 85 - 98 ° C. Afterwards the yarn is subjected to the washing or cleaning process. After dyeing, the bobbins are made with polyurethane yarn the suction of the excess of the dye liquor is dewatered; This is followed by drying at 7o to 8o ° C for about 12o minutes.

For example, the following are color recipes for polyurethane yarns indicated in braiding:

Brown color / suspension dye
0.3% dark syndrome brown SB
1 g / l dispersant NNO
0.3 g / l rokafenol N-8

3% Polan red B

0.5% Rokamin S-8

0.3 g / l rokafenol N-8

• Acetic acid up to pH-6

Brown color / metal complex color

0.6% polypropylene brown BL
o.2% polypropylene yellow GRL
0.4% Rokamin S-8
0.3 g / l rokafenol N-8
Acetic acid up to pH-6.

The covered polyurethane yarn dyed according to the invention is characterized is characterized by real coloring with a balanced degree of coloring of the wrapping and the polyurethane core. The yarn can be for everyone Assortments of knitwear and hosiery are used.

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Claims (1)

Claim A method for dyeing polyurethane yarns _f, characterized in that the wrapped polyurethane yarn, which approaches the zero value at constant tension, was wound onto perforated sleeves, subjected to the action of a dye liquor with selected dyes and auxiliaries, the dyeing at 85 to 98 ° C lasts from 30 to 90 minutes; Afterwards, the bobbins with the yarn are dewatered by suction and dried at 7o to 8o ° C for about 12o minutes. 609829/0650