JPS584869A - Alkali weight reduction of dyed fabric - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing staining due to dye bleeding and at the same time preventing discoloration of a dyed product during alkali weight loss processing of a dyed blend. This is an alkali weight loss processing method for dyed products that uses a combination of an alkaline agent and an inorganic or organic oxidizing agent during alkali weight loss processing of a dyed blend of polyester fines and cellulose fibers.

The problem with alkali weight reduction processing of mixed fabrics of polyester dyed with disperse dyes and cellulose dyed with cellulose dyes is that they are smoked under strong alkaline conditions, especially cellulose fibers. The method of alkali reduction treatment after dyeing the dye is attracting attention as one of the differentiated products, and the solution to the above-mentioned problem is one of the industry's 511I11.

In order to solve this problem, the present inventors conducted extensive research and found that the method of using a #forming agent in combination is extremely effective.

In the present invention, inorganic or organic oxidizing agents include, for example, inorganic oxidizing agents such as sodium nitrite, chlorate, and ammonium persulfate; Alkali metal salts, metanitrobenzenesulfone fine triethanolate salts, and hydroxylamine-based organic amines t* are salts.

Among these, the most preferred are ammonium or sodium persulfate, followed by sodium metanitrobenzenesulfonate and hydroxylamine.

These oxidizing agents can be used alone or in combination of two or more.

The amount of the oxidizing agent to be used is determined depending on the processing conditions and the degree of change in the dyed product, and is usually 0.8 to 5% by weight based on the processing bath. #1 shows a tendency to be effective if the amount used is large, but care must be taken as inorganic oxidizing agents have extremely strong effects.
□ In the present invention, polyester fibers are undyed or dyed with disperse dyes, and cellulose fibers dyed with vat dyes, sulfur dyes, and naphthol dyes are used.

The general method for carrying out the weight loss processing of the present invention involves selecting the required amount of strength soda and an oxidizing agent according to the desired weight loss processing rate of polyester fibers, and optionally a weight loss accelerator.
For example, add 1 surfactant, alcohol, etc. and add 0 to 1
Process at a temperature of 30°C. Processing methods include a batch method and a continuous method.

As the heating method, a direct heating method, a dry heat steam method, or a combination of high frequency waves may be used.

The present invention will be explained in more detail below with reference to Examples.

In the text, parts represent parts by weight.

Example: 5 parts of solid strength soda, 7 parts of a weight loss accelerator (DkK -//2, manufactured by Ichisen Yushi Co., Ltd.) and 0.5 parts of ammonium persulfate as an oxidizing agent were added to 6 parts of water. Stir well to prepare a uniform weight loss treatment bath. ◇ Next, 3 parts of heat gusseted polyester processed white cloth are coated with 3 parts of Nihon Slen Blue-BO Despersed Powder (manufactured by Sumikata Chemical Co., Ltd., vat dye). After dyeing to a concentration of 60 minutes at a bath temperature of 0.degree. C., washing with water, acid treatment, soaping, and washing with water are carried out. Weight loss rate of 7j%, and 2*surene blue n.

A processed product with reduced bleed and discoloration due to alkali treatment was obtained.

For reference, the same procedure was carried out without using ammonium persulfate according to the present invention.
Due to the alkali treatment, the O bleed significantly, and the dyed yarn also became noticeably yellowish and dark.

Example - Everything was carried out in the same manner as in Example, except that 94.5 parts of sodium sulfate and 94.5 parts of water were used in place of 96 parts of water and 0.5 part of ammonium persulfate used in Example. Ta.

A weight-reduced product with no bleeding or discoloration was obtained in the same manner as in Example.

Example J In place of 96 parts of water and 0.5 parts of ammonium persulfate used in Example, j parts of sodium metanitrobenzenesulfonate and 97 parts of water were added. Everything was carried out in the same manner as in Example/, except that s was used. As in Example 1, a weight-reduced product without bleeding or discoloration was obtained.

Example DA: Into 96 parts of water, 75 parts of solid caustic soda, 3 parts of a weight loss accelerator (DYI -//B, manufactured by Ichisen Yushi Co., Ltd.), 0.4 parts of hydroxylamine as an oxidizing agent, and 0 parts of sodium nitrite were added. Add .7 parts and stir well to prepare a homogeneous weight loss processing bath with a total amount of 700 parts.

Next, separately prepared polyester spun yarn (undyed)
The above-mentioned treatment bath was applied to a mixed woven fabric (ratio of 90 parts of white fabric of polyester spun yarn fabric/IO part of dyed yarn) of cotton yarn dyed with tgstvmv using Nirasen Carbon aL (sulfur dye manufactured by Sumikata Chemical Co., Ltd.). Apply uniformly with a pick-up 7θ- using a knife. Immediately, process continuously for 3 minutes using a high-pressure steamer adjusted to 130° C. 0. Perform normal water washing, acid treatment, water washing, soaping, and water washing. A weight loss product with a weight loss ratio of 3J IG and no dye bleeding or discoloration was obtained.

Example S Instead of the cotton yarn made from Nirasen Carbon OLE used in Example 41, Na7 Toy It () and Fast Orange G were used.
Everything was carried out in the same manner as in Example DA, except that a mixed woven fabric using o-pace (naphthol dye manufactured by Sumikata Chemical Co., Ltd.) was used. Weight loss rate/
In addition, visible signs of dye bleed and discoloration were obtained.

Example 6 11! Nihonthrene Blue B used in Example/
OK cotton yarn instead of dyed yarn % UNISLON Blue M
Polyester/Matto (4j/31
) Blended yarn 39! Everything was carried out in the same manner as in Example except that dyed yarn was used. A weight-reduced processed product with a weight loss rate of iuJ% without bleeding or discoloration can be obtained.

Claims (1)

[Claims] Alkaline agent