JPS58186683A - Dyeing of cellulose fiber - 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 A fibrous material consisting of cellulose fibers is prepared by applying a reactive dye having vinyl sulfone groups as a reactive component or having a group forming a vinyl sulfone group under the action of an alkali to the cellulose fibers under alkaline conditions. It is known that dyeing can be achieved by reacting with hydroxyl groups. For this purpose, as an alkali-acting agent, Japanese Patent Publication No. 52-12817
It is also known to use liquid soda water glass as described in , or a mixture of liquid soda water glass and sodium hydroxide.

However, when such a padding bath is used, an ending (tailing) occurs in which the concentration of the dyed fabric is lower than that at the beginning of the dyeing process, and a uniform dyed product cannot be obtained. There is.

The cause of this ending phenomenon is thought to be that the affinity between the dye and the fiber increases due to the salt effect of sodium metasilicate and liquid soda water glass, which are used to improve dyeability and reduce bleeding. For this reason, various efforts have been made to reduce the size of the padding tank, increase the number of liquid exchanges, increase the daytime speed of padding, etc., or no solution has actually been reached.

The inventors have developed iron fibrous membranes made of natural and/or regenerated cellulose that have at least one vinyl sulfone group as a reactive group or form at least one vinyl sulfone group in an alkaline medium. In the method of padding with a reactive dye having a group and the method of fixing the dye by residence, 2 to 25% by weight, especially 5 to 15% by weight, is added to the padding bath containing the above-mentioned dye and an alkali-active agent. It was discovered that by adding urea and padding the fiber material, it was possible to obtain a uniformly dyed product with no difference in concentration between the dyeing start and the dyeing process. In addition to these dyes, alkali-acting agents, and urea, the padding bath may also contain commonly used auxiliary agents such as anti-migration agents, penetrants, and deep dyeing agents.

Next, the present invention will be explained in detail with reference to Examples.

Example-1 50m of cotton boblin was compressed at 80% overlap,
Pad with a bath heated to 25°C. The bath contains, per 1 e of water, 100 f of sodium silicate of 49° Be', 7 ml of sodium hydroxide of 88° BC'& 100 f of diurea.

After padding, the fabric is continuously rolled up at 25-80°C.
Expand at 4 hour intervals. The dyed article is then rinsed in the usual manner, soaped in a bath containing at/l monogen paste at 98-too much DEG and dried. As shown in Table 1, the resulting dyed product was uniform with no discernible difference in density between the starting color and the grain size.

For comparison, when a padding bath that did not contain urea was used, the tailing of anti-rice was 35% lower than at the beginning.

Example-2 In the compression effect of 50 m of cotton boblin at 80% weight,
Pad with a bath heated to 25°C. The bath contains 80 f of dye (commercially available) of formula (2) per 1 e of water and 150 ml of sodium silicate of 49° Be'. , and urea 1009.

After padding, the dyed material was post-treated by the method of Example 1, and was uniform with no difference in density between the starting color and the grain.

For comparison, when a padding bath containing no urea was used, tailing occurred with a degree of anti-rice that was 25% lower than at the start.

Example-3 In the compression effect of 50 m of cotton material at 100*%, 2
Pad with a bath heated to 5°C. The bath consists of 100f of sodium hydroxide of formula (8) (commercially available) 152.49'Be' per 14 of water, 7ml of sodium hydroxide of 88'Be'.
, and urine*1oor. After Puzzle, Example-
The dyed product post-treated by method 1 was uniform with no difference in density between the starting color and the rice grain.

For comparison, when a padding bath containing no urea was used, tailing occurred in which the concentration of anti-rice was 40% lower than at the beginning.

Example-4 80% by weight of 50 recycled cellulose filament fabrics
In the squeezing effect, padding is performed in a bath heated to 25°C. The liquid bath is formula (4) % formula % sodium 150 per 14 water? , 88° Be' of sodium hydroxide 15*/, and urea 1509. After padding,
The dyed product post-treated by the method of Example 1 was uniform with no difference in #margin between the start and finish.

For comparison, when a padding bath containing no urea was used, tailing occurred where the concentration of anti-rice was 80% lower than at the beginning.

Example-5 50m of cotton knitted fabric was compressed at a compression rate of 100%.
Pad with a bath heated to 5°C. The liquid bath has a formula <5), (6), +7) ONH per water tg.

(commercially available) containing 100 f of IJum and 100 t of urine.
do. After padding, the dyed product which was post-treated by the method of Example 1 had a uniform brown color with -1 and no difference in hue.

For comparison, when a padding bath that did not contain urea was also used, tailing was observed in which the hue of the dye was reversed and turned purple compared to the starting color.

Claims (1)

[Claims] Padding of a fibrous material consisting of natural and/or regenerated cellulose fibers with a reactive dye having as reactive group at least one vinyl sulfone group or having a group forming at least one vinyl sulfone group in an alkaline medium. In the method of dyeing and fixing the dye by retention, the fiber material is treated with urea in a padding bath containing liquid soda water glass or a mixture of liquid soda water glass and sodium hydroxide as the above-mentioned dye and alkali-acting agent. A method for dyeing cellulose fibers, characterized by adding 2 to 25% by weight.