CN107237180A - A kind of method of natural plant dye exhaust dyeing cellulosic fabric - Google Patents

Abstract

The invention discloses a method for pad-dyeing cellulose fabric with natural plant dyes. The natural plant dyes are added into water to prepare a natural plant dye solution; the cationic dye fixing agent is dissolved in the natural plant dye solution to prepare a dyeing solution. Working solution: immerse the cellulose fabric to be dyed in the prepared dyeing working solution, and roll it on the paddle car, then dip it into the gardenia blue dyeing working solution for dip dyeing, and then roll it on the padding car to complete the fiber to be dyed Coloring of plain fabrics; after the coloring is completed, the colored cellulose fabrics are dried, and the dried colored cellulose fabrics are washed with detergent to remove floating colors; the washed cellulose fabrics are dried to complete the natural Dyeing with vegetable dyes. The beneficial effect of the invention is that it can increase the dyeing amount of natural dyes, and at the same time improve the color fastness to washing without affecting the color of natural dyes.

Description

A kind of method for pad dyeing cellulose fabric with natural vegetable dye

technical field

The invention belongs to the technical field of textile chemistry and relates to a method for pad-dyeing cellulose fabrics with natural vegetable dyes.

Background technique

In recent years, with the improvement of people's living standards, green and environmentally friendly textiles are favored by consumers. Therefore, the research on dyeing natural fibers with natural dyes has attracted widespread attention, especially the dyeing technology of cotton fibers dyed with natural plant dyes.

Natural plant dyes are extracted from plants and are a sustainable biological resource with the advantages of non-toxic, harmless, pollution-free and biodegradable. However, due to the structure of the dye molecule itself, natural plant dyes have low brilliance, uneven hue, and deviations in weather fastness. During the dyeing process, the dyeing amount of dyes on cotton fibers and the color fastness to washing are poor, which limits its application in textiles.

In order to improve the dyeing capacity and color fastness to washing of natural dyes, usually, hydrophilic fibers such as protein and cellulose are dyed without mordant, dyed first and then mordant, and dyed first and then mordant. Since some metal ions have color, such as iron ions and copper ions, some mordant dyeing processes will change the color of natural dyes after dyeing. In addition, cotton fabrics are dyed with natural vegetable dyes, usually by dip dyeing. Compared with the pad dyeing process, the dyeing temperature is higher and the dyeing time is longer. These dyeing methods and techniques cannot meet the requirements of ecological environmental protection. Therefore, it is imminent to develop new energy-saving, high-efficiency, environmental protection and healthy dyeing techniques.

Dye color fixing agent is an auxiliary agent used to improve the color fastness of dyes to wet treatment of textiles. It is a color fixing treatment after textile dyeing. The usual cationic surface-active quaternary ammonium salt color-fixing agent, its color-fixing mechanism is to combine cationic quaternary ammonium salts with sulfonic acid anions on the dye after dyeing with water-soluble anionic dyes, so that the dye is fixed In textiles, it can achieve color fixation and improve color fastness, especially color fastness to washing.

Contents of the invention

The purpose of the present invention is to provide a method for pad-dyeing cellulose fabric with natural vegetable dyes, which solves the problems of low dyeing amount and poor color fastness to washing in the existing natural vegetable dyeing process.

The technical scheme adopted in the present invention is to carry out according to the following steps:

Step 1: adding natural plant dyes into water to prepare a natural plant dye solution with a concentration of 20-50g/L;

Step 2: dissolving the cationic dye fixing agent in the natural plant dye solution to make a dyeing working solution containing 2-5g/L cationic dye fixing agent;

Step 3: Dip the cellulose fabric to be dyed into the prepared dyeing working solution, and roll it on the paddle car, then dip it into the gardenia blue dyeing working solution, and then roll it on the padding car. 70%-100%, complete the coloring of the cellulose fabric to be dyed;

Step 4: After the coloring is completed, the colored cellulose fabric is dried at a drying temperature of 70-100°C;

Step 5: washing the dried colored cellulose fabric with detergent to remove floating color;

Step 6: drying the washed cellulose fabric to complete the dyeing of natural vegetable dyes.

Further, the natural vegetable dyes are gardenia blue, turmeric, and green tea.

Further, the cellulose fabric is cotton, hemp, viscose fabric.

The beneficial effect of the invention is that it can increase the dyeing amount of natural dyes, and at the same time improve the color fastness to washing without affecting the color of natural dyes.

detailed description

The present invention will be described in detail below in conjunction with specific embodiments.

Embodiment 1: Get 20g, 30g, 40g, 50g of natural dye gardenia blue and dissolve in 1L of water, add 4g of cationic dye fixing agent, be made into dyeing working solution. Soak 6g of cotton cloth in the gardenia blue dyeing working solution to absorb the dye, roll it on a paddle car, then immerse it in the gardenia blue dyeing working solution for dyeing, and then roll it on the padding car (that is, two dips and two pads), so that the soaked The liquid carrying rate of the pad-dyed cotton cloth was 90% (ie 11.4 g), and then dried at 90°C. Wash the dried dyed cotton cloth in 500ml washing liquid containing 2g/L non-ionic detergent at 70°C for 15min, and finally dry it to complete the cotton cloth dyeing.

The K/S value of the dyed cotton cloth after washing and drying was detected by a color measuring instrument to characterize the dyeing amount of natural dyes, and the color fastness to washing of the dyed cotton cloth after washing was detected. The results are listed in Table 1. The higher the K/S value, the darker the color and the higher the dye uptake; the smaller the K/S value, the lighter the color and the lower the dye uptake. The color fastness to washing is evaluated according to the national standard based on the degree of staining of cotton in multi-fiber fabrics by dyes.

Table 1 shows that when the amount of dye is 40g (40g/L), the K/S value of the dyed cotton cloth is the largest, that is, the dyeing amount of natural dyes is the largest, and the color fastness to washing reaches level 4.

Table 1. The effect of the dosage of different natural dyes gardenia blue on the K/S value and color fastness to washing of cotton pad dyeing

Dye dosage (g) K/S value Color fastness to washing (grade) 20 4.61 3 30 6.32 3-4 40 11.58 4 50 9.96 3-4

Embodiment 2: Get 40g of natural dye gardenia blue and dissolve in 1L of water, add 0g, 2g, 3g, 4g, 5g of cationic dye fixing agent, be made into dyeing working solution. Soak 6g of cotton cloth in the gardenia blue dyeing working solution to absorb the dye, roll it on a paddle car, then immerse it in the gardenia blue dyeing working solution for dyeing, and then roll it on the padding car (that is, two dips and two pads), so that the soaked The cotton cloth after pad dyeing had a liquid retention rate of 90%, and was then dried at 90°C. Wash the dried dyed cotton cloth in 500ml washing liquid containing 2g/L non-ionic detergent at 70°C for 15min, and finally dry it to complete the cotton cloth dyeing.

The K/S value of the dyed cotton cloth after washing and drying was detected by a color measuring instrument to characterize the dyeing amount of natural dyes, and the color fastness to washing of the dyed cotton cloth after washing was detected. The results are listed in Table 2. The higher the K/S value, the darker the color and the higher the dye uptake; the smaller the K/S value, the lighter the color and the lower the dye uptake. The color fastness to washing is evaluated according to the national standard based on the degree of staining of cotton in multi-fiber fabrics by dyes.

Table 2 shows that when the cationic dye fixing agent is 4g (4g/L), the K/S value of the cotton cloth dyed by it is the largest, that is, the dyeing amount of the natural dye is the largest, and the color fastness to washing reaches level 4. When no cationic dye fixing agent is added, the dye uptake is very little, and the color fastness to washing is very poor.

Table 2. Effects of the dosage of different cationic dye fixing agents on the K/S value and color fastness to washing of cotton pad dyeing

Embodiment 3: Dissolve 40 g of natural dye gardenia blue in 1 L of water, add 4 g of cationic dye fixing agent, and make dyeing working solution. Soak 6g of cotton cloth in the gardenia blue dyeing working solution to absorb the dye, roll it on a paddle car, then immerse it in the gardenia blue dyeing working solution for dyeing, and then roll it on the padding car (that is, two dips and two pads), so that the soaked The liquid-carrying ratios of the pad-dyed cotton cloths were 70%, 80%, 90%, and 100%, respectively, and then dried at 90°C. Wash the dried dyed cotton cloth in 500ml washing liquid containing 2g/L non-ionic detergent at 70°C for 15min, and finally dry it to complete the cotton cloth dyeing.

The K/S value of the dyed cotton cloth after washing and drying was detected by a color measuring instrument to characterize the dyeing amount of natural dyes, and the color fastness to washing of the dyed cotton cloth after washing was detected. The results are listed in Table 3. The higher the K/S value, the darker the color and the higher the dye uptake; the smaller the K/S value, the lighter the color and the lower the dye uptake. The color fastness to washing is evaluated according to the national standard based on the degree of staining of cotton in multi-fiber fabrics by dyes.

Table 3 shows that although all the color fastnesses to washing reach Grade 4, when the liquid retention rate is 90%, the K/S value of the dyed cotton cloth is the largest, that is, the dyeing amount of natural dyes is the largest.

Table 3. Effects of different liquid loading rates on the K/S value and color fastness to washing of cotton pad dyeing

Liquid carrying rate (%) K/S value Color fastness to washing (grade) 70 7.58 4 80 9.19 4 90 11.58 4 100 11.21 4

Embodiment 4: Dissolve 40 g of natural dye gardenia blue in 1 L of water, add 4 g of cationic dye fixing agent, and prepare a dyeing working solution. Soak 6g of cotton cloth in the gardenia blue dyeing working solution to absorb the dye, roll it on a paddle car, then immerse it in the gardenia blue dyeing working solution for dyeing, and then roll it on the padding car (that is, two dips and two pads), so that the soaked The liquid retention rate of the pad-dyed cotton cloth was 90%. Then dry at 70°C, 80°C, 90°C, 100°C. Wash the dried dyed cotton cloth in 500ml washing liquid containing 2g/L non-ionic detergent at 70°C for 15min, and finally dry it to complete the cotton cloth dyeing.

The K/S value of the dyed cotton cloth after washing and drying was detected by a color measuring instrument to characterize the dyeing amount of natural dyes, and the color fastness to washing of the dyed cotton cloth after washing was detected. The results are listed in Table 4. The higher the K/S value, the darker the color and the higher the dye uptake; the smaller the K/S value, the lighter the color and the lower the dye uptake. The color fastness to washing is evaluated according to the national standard based on the degree of staining of cotton in multi-fiber fabrics by dyes.

Table 4 shows that when the drying temperature after pad dyeing is 90°C, the K/S value of the dyed cotton cloth is the largest, that is, the dyeing amount of natural dyes is the largest, and the color fastness to washing reaches level 4.

Table 4. Effects of different drying temperatures on the K/S value and color fastness to washing of cotton pad dyed after pad dyeing

temperature(℃) K/S value Color fastness to washing (grade) 70 7.62 3-4 80 9.43 3-4 90 11.58 4 100 11.41 4

Embodiment 5: Dissolve 40 g of natural dye gardenia blue in 1 L of water, add 4 g of cationic dye fixing agent, and prepare a dyeing working solution. Soak 6g of cotton cloth in the gardenia blue dyeing working solution to absorb the dye, roll it on a paddle car, then immerse it in the gardenia blue dyeing working solution for dyeing, and then roll it on the padding car (that is, two dips and two pads), so that the soaked The cotton cloth after pad dyeing has a liquid carrying rate of 90%, and then it is dried at 90° C., that is, the dye and the cationic fixing agent are dyed synchronously (synchronous color fixation). Another 40g of natural dye gardenia blue was dissolved in 1L of water to make a dyeing working solution. Take 4g of cationic dye fixing agent to make color fixing working solution. Immerse 6g of cotton cloth into the gardenia blue dyeing working solution that does not contain cationic dye fixing agent to absorb the dye, roll it on the paddle car, then dip it into the gardenia blue dyeing working solution, and then roll it on the paddle car (ie Two dips and two pads), so that the liquid-carrying rate of the cotton cloth after pad pad dyeing is 90%, and then dried at 90°C. Dip the dried dyed cloth into the color-fixing working solution, two dipping and two padding, the liquid retention rate is 90%, and then dry at 90°C, that is, dyeing first and then color fixing. Wash the dried dyed cotton cloth in 500ml washing liquid containing 2g/L non-ionic detergent at 70°C for 15min, and finally dry it to complete the cotton cloth dyeing.

The K/S value of the dyed cotton cloth after washing and drying was detected by a color measuring instrument to characterize the dyeing amount of natural dyes, and the color fastness to washing of the dyed cotton cloth after washing was detected. The results are listed in Table 5. The higher the K/S value, the darker the color and the higher the dye uptake; the smaller the K/S value, the lighter the color and the lower the dye uptake. The color fastness to washing is evaluated according to the national standard based on the degree of staining of cotton in multi-fiber fabrics by dyes.

In Table 5, after dyeing first and then fixing, the dyeing amount and color fastness to washing of the dyed cotton cloth are worse than the dyeing method of simultaneous dyeing and color fixing, indicating that the dyeing method of simultaneous dyeing and color fixing is better than that of dyeing first and then color fixing Good way of dyeing.

Table 5. Effects of different dyeing methods on the K/S value and color fastness to washing of cotton pad dyeing

Dyeing method K/S value Color fastness to washing (grade) Color fixation after dyeing 4.04 3 dyeing color synchronization 11.58 4

The advantage of the present invention is that the natural dye and the dye fixing agent of the present invention perform pad dyeing synchronously, instead of dyeing first and then fixing, which saves dyeing time and simplifies the dyeing process, and is a new dyeing technology for energy saving and consumption reduction. This technology not only increases the yield of natural dyes, but also improves their color fastness to washing without affecting the color of natural dyes.

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Any simple modifications made to the above embodiments according to the technical essence of the present invention, equivalent changes and modifications, all belong to this invention. within the scope of the technical solution of the invention.

Claims (3)

1. a method for padding and dyeing cellulose fabrics with natural vegetable dyes, is characterized in that it is carried out according to the following steps: Step 1: adding natural plant dyes into water to prepare a natural plant dye solution with a concentration of 20-50g/L; Step 2: dissolving the cationic dye fixing agent in the natural plant dye solution to make a dyeing working solution containing 2-5g/L cationic dye fixing agent; Step 3: Dip the cellulose fabric to be dyed into the prepared dyeing working solution, and roll it on the paddle car, then immerse it in the gardenia blue dyeing working solution for dip dyeing, and then roll it on the padding car. 70-100%, complete the coloring of the cellulose fabric to be dyed; Step 4: After the coloring is completed, the colored cellulose fabric is dried at a drying temperature of 70-100°C; Step 5: washing the dried colored cellulose fabric with detergent to remove floating color; Step 6: drying the washed cellulose fabric to complete the dyeing of natural vegetable dyes. 2. according to the method for a kind of natural plant dye pad dyeing cellulose fabric described in claim 1, it is characterized in that: described natural plant dye is gardenia blue, turmeric, green tea. 3. according to the method for a kind of natural plant dye pad dyeing cellulose fabric according to claim 1, it is characterized in that: described cellulose fabric is cotton, hemp, viscose fabric.