CN106120381B - It is a kind of to prepare the technique for imitating old style fabric based on bipseudoindoxyl dye pad dyeing - Google Patents

Abstract

It is the invention belongs to technical field of textile chemical engineering, more particularly to a kind of to prepare the technique for imitating old style fabric based on bipseudoindoxyl dye pad dyeing.Bipseudoindoxyl dye, sodium hydrosulfite, alkali are added to the water first and restored；Fabric is immersed carry out pad dyeing after adding binder and stirring evenly, aoxidizes, wash in air, being obtained with the fabric for imitating old style after drying.The dyed fabric of acquisition paler colour and whiting in perception have significantly imitative old style, and eliminate the processes such as conventional wash water, stripping drift.

Description

A process for preparing distressed style fabrics based on indigo dye pad dyeing

technical field

The invention belongs to the technical field of textile chemical industry, and in particular relates to a process for preparing old-fashioned fabrics based on indigo dye pad dyeing.

Background technique

With the development of the textile industry, as well as consumers' higher and higher requirements for fabrics and aesthetics, more and more fabrics with different styles have begun to appear. Among them, denim or imitation denim fabrics with nostalgic style are favored by consumers due to their appearance, unique artistic style, casual personality and fashion, and have great market value.

In fabric dyeing using natural dyes, indigo is an important dye representing the cyan series, also known as indigo. The preparation process of indigo dye is simple and economical. However, because indigo itself is a vat dye and is insoluble in water, it needs to be reduced by a reducing agent to form a water-soluble leuco body during dyeing, so that it can be adsorbed on the fiber; Deposits on the fibers again in a water-insoluble form. Therefore, the color depth of indigo dyeing is relatively high, so it is necessary to further wash the dyed fabric (to peel off the indigo dye that has been dyed on the fabric to a certain extent) to obtain an old-fashioned style, such as pumice washing, high manganese Potassium acid washing, hypochlorous acid washing, enzyme washing, etc., the process costs are very considerable.

Contents of the invention

The object of the present invention is to: provide a kind of technology that prepares the imitation style fabric based on the pad dyeing of indigo dye, has removed loaded down with trivial details washing operation, concrete operation is:

(1) Adopt conventional indigo reduction process, add indigo dye, sodium hydrosulfite and alkali into water for reduction,

Wherein, alkali selects sodium hydroxide,

The mass ratio of indigo dye, sodium hydrosulfite, alkali, and water is 2.5:3:2:100,

The reduction temperature is 40°C, the reduction time is 5min,

In this step, the indigo dye is reduced to a leuco body that is soluble in water and easily combined with the hydrophilic fabric by reduction, so as to facilitate the adsorption of the dye on the fabric in the later stage;

(2) Dilute the system obtained in step (1) with water, add a binder and stir evenly, then immerse the fabric in it for pad dyeing, oxidize, wash with water, and dry to obtain a fabric with an old-fashioned style.

Wherein, add water to dilute to 10 times of volume, the concentration of the binder that adds after is 40g/L,

The fabric is denim or denim-like fabric,

The pad dyeing operation is two dips and two pads, the padding rate is 70%, and the interval between the two pads is 2 to 5 minutes.

After pad dyeing, oxidize in the air for 10 minutes, wash twice and then dry at 80°C.

In this step, indigo dye and adhesive are used to treat the fabric at the same time. At this time, the adhesive can form competitive adsorption with the leuco body of indigo, which has the effect of "occupancy" and reduces the adsorption of the fabric to the leuco body. The resulting dyed fabric is lighter and white in appearance, with an obvious distressed style, eliminating the need for conventional denim finishing processes such as washing, peeling and bleaching.

Detailed ways

Example 1

(1) Add 2.5 parts by mass of indigo dye, 3 parts by mass of hydrosulfite, and 2 parts by mass of sodium hydroxide into 100 parts by mass of water and disperse evenly, and perform a reduction reaction at 40° C. for 5 minutes;

(2) After the system obtained in step (1) is diluted 10 times with water, the adhesive PY is added according to the concentration of 40g/L and stirred evenly, then the fabric is immersed in it for pad dyeing, two dips and two pads (the padding ratio is 70%, two padding intervals of 4 minutes), oxidized in the air for 10 minutes, washed twice and then dried at 80°C to obtain a fabric with an old-fashioned style.

The dyed fabric has good color fastness, uniform color distribution, excellent handle, and has the unique whitening and distressed style of denim.

The dry rubbing fastness can reach grade 4, the wet rubbing fastness can reach grade 3, and the light fastness can reach grade 4. The measured K/S value is 0.4930, and the K/S value after soaping is 0.4390.

Comparative Example 1

(1) Add 2.5 parts by mass of indigo dye, 3 parts by mass of hydrosulfite, and 2 parts by mass of sodium hydroxide into 100 parts by mass of water and disperse evenly, and perform a reduction reaction at 40° C. for 5 minutes;

(2) After the system obtained in step (1) is diluted 10 times with water, then the fabric is immersed in it for pad dyeing, two dips and two pads (residual rate of padding is 70%, and the interval between two pads is 4 minutes) in the air. Oxidize for 10 minutes, wash twice with water and dry at 80°C.

The dyed fabric has a darker color, the measured K/S value is 2.7539, and the K/S value after soaping is 2.3657, which does not have an old-fashioned style; the dry rubbing fastness can reach level 4, and the wet rubbing fastness can reach level 4 grade, and the light fastness can reach grade 4.

Claims (4)

1. a kind of preparing the technique for imitating old style fabric based on bipseudoindoxyl dye pad dyeing, it is characterised in that：The technique is,

(1) bipseudoindoxyl dye, sodium hydrosulfite, alkali are added to the water and are restored；Wherein, the quality of bipseudoindoxyl dye, sodium hydrosulfite, alkali, water Than being followed successively by 2.5：3：2：100；

(2) system obtained to step (1) is diluted with water to 10 times of volumes, and adhesive is added and stirs evenly, then fabric is soaked Enter and wherein carry out pad dyeing, the fabric with imitative old style is obtained after oxidation, washing, drying, wherein the adhesive of addition it is dense Degree is 40g/L.

2. the technique for imitating old style fabric is prepared based on bipseudoindoxyl dye pad dyeing as described in claim 1, it is characterised in that：Step (1) in, reduction temperature is 40 DEG C, recovery time 5min.

3. the technique for imitating old style fabric is prepared based on bipseudoindoxyl dye pad dyeing as described in claim 1, it is characterised in that：Step (2) in, padding operation is that two leachings two are rolled.

4. the technique for imitating old style fabric is prepared based on bipseudoindoxyl dye pad dyeing as described in claim 1, it is characterised in that：Step (2) in, drying temperature is 80 DEG C.