SU789644A1 - Composition for bleaching cellulose-containing textiles - Google Patents

Description

I

The invention relates to textile finishing, and specifically to the technology of bleaching textile materials from natural and regenerated cellulose.

Known composition of bleaching cellulosic textile materials, namely cotton and viscose fabrics, containing, g / l:

Peracetic acid2

Sodium tripolyphosphate 3

Hexametaphosphate

rub 3

Water the rest to

1 l

The disadvantages of this composition are the difficulty of preparation, the instability at elevated temperature, the unpleasant odor, the explosion hazard.

Also known composition 21 for bleaching cotton and viscose fabrics, containing, g / l:

Hydrogen peroxide2.5

Caustic Soda1,5

Sodium silicate 5.0

A mixture of polyethylene glycol ethers

mono- and dialkylpheno-

fishing (preparation OP-7) 0.75

Water the rest to

1 l

However, the content of alkali in this composition causes the destruction of cellulose, which reduces the mechanical strength of tissues, and the use of sodium silicate as a stabilizer leads to the formation of hardly soluble precipitates on the fabric and equipment. As a result of bleaching, the quality of fabrics deteriorates: their stiffness increases, the neck deteriorates, capillaryness decreases, and unevenness and neprokras are observed in the course of dyeing.

The closest to the invention to the technical essence and the achieved result is the composition of ZTdl bleaching of cellulosic textile materials, containing, g / l:

Hydrogen peroxide Potassium tungstate A mixture of polyethylene glycol ethers M.ONO- and dialkylphenols (preparation

on-)

Caustic sodium

Water

The rest is up to 1 l

This composition provides increased whiteness and reduces cellulose degradation. So. when bleaching visceral tissues according to a method that includes blending with a bleaching composition at 40–50 ° C, followed by steaming at 94–98 ° C for 10–15 degrees, the whiteness of the fabric increases 75.9 - 78.2%. and the degree of polymerization of cellulose (SP) increases 254-26. In addition, in the bleaching process, the formation of insoluble silicate sediments is not observed, the pollution of wastewater is reduced.

However, as follows from the size of the joint venture, when using this composition, the destruction of cellulose still occurs, as a result of which the mechanical strength of the bleached fibers is reduced. stylish materials.

The purpose of the invention is to increase the mechanical strength of materials by reducing the destruction of cellulose.

This goal is achieved by those. that the composition contains hydrogen peroxide. Potassium tungstate, a mixture of polyethylene glycol ethers of mono- and dialkylphenols and water, additionally contains sulfuric acid in the following ratio of components, g / l:

Hydrogen peroxide 2.3-2.7

Potassium tungstate 0.5-0.55

A mixture of polyethylene-glycol ethers mono - and dialkylfe0, 7-0.8 nol To pH 5-6

Sulfuric acid Else to Water 1 l

The composition can be used, for example, to bleach cotton and viscose fabrics.

For example, the preparation OP-7 is used as a mixture of polyethylene glycol ethers of mono- and dialkylphenols. whose active base is a mixture of compounds of the formula

0 () N

R i

where K is alkyl, containing mainly 8-10 C atoms; has the same meaning as

1 14. or means H; C - on average equal to 6-7. Potassium tungstate in this composition performs the function of not only a bleaching activator, but. decomposition of hydrogen peroxide through intermediates, reduces the destruction of cellulose. When bleaching with hydrogen peroxide in an acidic medium with an increase in the concentration of O bleaching solution from 1.67 to 10 mol / l, to, 1.67. 10 mol / l and 1.671 o mol / l; SP of pulp increased, respectively, from 254 to 26 O and 272.

One of the advantages of the proposed composition is its ability to use it on existing bleaching equipment. Example 1. Viscose fabric art. 72110 plus at 40-50 With the composition 1. containing, g / l:

2.3

Hydrogen peroxide 0.5 Potassium tungstate 0.7 Drug OP-7

Up to pH 5 Sulfuric acid Else to Water

51l

The plummet fabric is pressed to

ground moisture content 1oo-1O5%. steamed with saturated steam at 94-98 for 15 minutes. washed

0 first water with a temperature of 6O-70gS. and then cold water and dried.

EXAMPLE 2. Bleaching is carried out as indicated in Example 1 using bleaching compositions and HPI

5. Whitening composition P. g / l:

2.7

Hydrogen peroxide Potassium tungstate 0.55 0.8 Preparation OP-7 Sulfuric acid

Up to pH 6.0 Water Else ao

1l

bleaching compound) .M. g / l: hydrogen peroxide

2.5 Potassium tungstate

O, 53 0.75 Preparation OP-7 Sulfuric Acid

Up to pH 5.5 Water Else ao

1 l

The results of determining the degree of whiteness of the bleached viscose fabrics according to GOST 9115-61 and the degree of polymerization of cellulose for the viscosity of the cyanamide cellulose solution are given in the table below.

74.5

270 75.0

27O

272

74.9

Sh

Thus, as follows from the table, the proposed composition while maintaining a high degree of whiteness provides a significant increase in the degree of polymerization of cellulose by reducing its destruction under bleaching conditions, which results in an increase in the mechanical strength of bleached textile materials.

Claims (3)

1.Predtechensk IA and others. The use of peracetic acid in the bleaching of fabrics from cotton and polyamide fabrics. Textile industry, 1964, 5 N9 5, p. 41 2. Sadov, F.I., et al. Chemical Materials Technology. M., Easy Industri, 1972, p. 156-163, 215-218. 3. Author's certificate of the USSR according to the application N 2449490 / 28-05  cl. T) 06L 3/02, 1977 (prototype).