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How to improve the effect of polyester fabric cleaning

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How to improve the effect of polyester fabric cleaning

Release date:2017-01-13 Author:科润生物 Click:

For a long time, the dyeing fastness of polyester and its blended fabric has been a difficult problem. Among them, reductive cleaning is a more general and simple method. Because the surface of the fiber attached to disperse dyes will be reduced to colorless, and soluble in water. The traditional reduction cleaning method is to use the insurance powder, caustic soda treatment. At present, most of the domestic dyeing factory are still using this method.

Why do you want to restore the cleaning?

Mainly polyester dyeing time is high temperature and high pressure, although scattered small dye molecules but can not guarantee when all staining dye molecules into the fiber, some disperse dyes will be attached on the surface of the fiber, resulting in poor fastness, and reduction cleaning methods will not enter the dye molecules inside the fiber damage to improve the fastness, improve color etc..

Two. Reducing the shortcomings of traditional cleaning process

As consumers of fabric color fastness, such as requirements increase, reduction in cleaning dyeing processing process: complex process occupies a large number of dyeing time; wash water, increase the sewage discharge amount and neutralization.

The traditional method requires under alkaline conditions, and disperse dyes is acidic condition, therefore must be discharged after dyeing dyeing liquid, and then wash with hot water to restore clean and wash water and acid treatment, the whole process is complicated, not only high energy consumption and long process time rate is not high.

In addition, the insurance powder is a sulfur-containing compound, the main component is Na2s2O4, the sewage discharge is also the residue of sulfide, increasing the burden of sewage treatment.

The dyeing process belongs to the high energy consumption, high water consumption, high pollution of the mode of production of polyester fiber, especially with disperse / reactive dyes, acid dyes two bath dyeing effect is very significant, in ensuring the quality of dyeing conditions, how to reduce energy consumption, reduce emissions is dyeing factory concern, dye dispersion after traditional general cleaning the hydrosulfite cleaning agent of raw materials, not only the process of long period, high energy consumption, but also seriously polluted the environment, application of reduction cleaning agent aliette TM directly into the reduction cleaning does not change in the dye bath under acidic conditions, can achieve the cleaning effect than the traditional insurance powder better (such as dry and wet rubbing fastness, resistance soaping fastness), at the same time, improve production efficiency.

Commonly used reductive cleaning method:

Insurance powder;

Thiourea dioxide;

Reducing agent;

First, insurance powder

The powder is widely used in the textile industry, such as reducing dyeing, reducing cleaning, printing and bleaching and bleaching of silk, wool, nylon and other fabrics.

The insurance powder is actually not "insurance", many accidents show the insurance powder, the spontaneous combustion of explosive, toxic, flammable properties in water or acid, and the aqueous solution of the unstable nature of the danger of it, once the accident, the fire risk is huge.

Conventional insurance powder reduction cleaning process

The conventional insurance powder reduction under alkaline conditions, so must be drained after dyeing, adding water, alkali, insurance powder heating to 80 DEG C, heat for 20 minutes, to achieve reduction effect, then need to wash water, glacial acetic acid for acid neutralization.

Two, thiourea dioxide

Thiourea dioxide is a compound with no oxidation and non reductive. The product is stable in acidic solution, but is easily decomposed under alkaline conditions, so it has a very strong reducing sulfonic acid. Compared with the powder, the product has high reduction potential, good safety performance, no pollution in production and use. In the textile industry, mainly used in bleaching, dyeing, printing, reducing cleaning, decoloring process.

Because of the strong reducibility of thiourea dioxide, it is very effective to reduce the dyeing and finishing of disperse dyes, and it can be synchronized with the bath in the acidic and alkaline reducing bath. In the fabric fiber does not damage the fiber, sulfur dioxide can be directly applied to acid or alkaline reduction cleaning process, in acidic conditions than the insurance powder to save the cost of technology.

Usage and dosage of thiourea dioxide in reductive cleaning

In the dyeing of the sample OK, the direct addition of sulfur dioxide urea 2%, heating up to 80 degrees C-85 degrees C, heat preservation for 20 minutes, wash hot wash for 80 degrees CX10 minutes. After washing the next operation can be cold.

In T/C, CVC, polyester and cotton fabric, reducing washing fastness after cleaning up to 3, compared with the insurance powder, thiourea dioxide can improve the washing fastness level 0.5.

Three, it is special Li Jie

It is specifically for the special Li Jie disperse dye acid dyeing and development, can replace the thiourea dioxide powder for cleaning and insurance reduction of polyester, polyester cotton fabric, it has strong reducing ability, to the floating color effect, application of high safety, less dosage, and simple liquid, use without alkali neutralization. Light, in the dark, do not need to discharge can direct reduction cleaning, so as to shorten operation time, reduce the production cost. Is a new type of environmentally friendly acid reducing agent, mainly used for cleaning the T/C, CVC, T/R of disperse dyes for polyester and polyester cotton blended reduction is a reduction cleaning agent can completely replace the thiourea dioxide powder and insurance.

Usage and dosage:

The dye component below 3, with special Li Jie it 2%, dye washing to the kind of OK, at 80 C under the condition of directly adding special Li clean it, temperature 80 degrees C, 85 degrees C, holding for 20 minutes, wash in cold water after the operation to the next process. The dye component 3 - more than 5, with special Li clean it, do not discharge the liquid directly into the at 80 degrees under the conditions of C, temperature 80 degrees C, 85 degrees C, holding for 20 minutes, then rinse with cold water.

Elite is used to restore the disperse dyes

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