CN-121976402-A - Method for improving color fastness of berberine vegetable dye on fabric

Abstract

The invention relates to the technical field of dyeing and finishing, in particular to a method for improving the color fastness of berberine vegetable dye on fabric, which comprises the following steps of 1) modifying the fabric through phytic acid solution before dyeing, 2) dyeing and washing the phytic acid modified fabric by using the berberine vegetable dye during dyeing, wherein the fabric is pure cotton fabric, pure lyocell fabric or cotton/lyocell fiber blended fabric. The invention firstly modifies the fabric by phytic acid and then carries out a stepwise process of dyeing, which can fully exert the modification effect of phytic acid, avoid the acid-base reaction of the phytic acid which is acidic and the berberine plant dye which is alkaline in one bath dyeing, combine the phosphoric acid on the phytic acid with cotton or lyocell fiber fabric through phosphate bonds, ionize the unreacted phosphoric acid to obtain H + , lead the whole fabric to be negatively charged, greatly increase the dye combining position of a plurality of unreacted phosphate ions on the fabric, improve the dye-uptake of the berberine plant dye on the fabric, and realize the color fastness reaching more than 4 levels.

Inventors

• ZHENG YUNBO
• ZHENG XIAOJIA
• SHAO TIANPENG
• CHEN LINGLING

Assignees

• 海西纺织新材料工业技术晋江研究院
• 福建海纺新材料科技有限公司

Dates

Publication Date

20260505

Application Date

20260128

Claims (10)

1. 1. The method for improving the color fastness of the berberine vegetable dye on the fabric is characterized by comprising the following steps: 1) Before dyeing, modifying the fabric by using a phytic acid solution to obtain a phytic acid modified fabric; 2) And during dyeing, the berberine plant dye is used for dyeing and washing the phytic acid modified fabric.
2. 2. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 1, wherein the fabric is pure cotton fabric, pure lyocell fabric or cotton/lyocell fiber blended fabric.
3. 3. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 2, wherein the fabric is a knitted fabric or a woven fabric.
4. 4. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 1, wherein the solvent of the phytic acid solution is water, and the concentration of the phytic acid is 3-10%.
5. 5. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 1, wherein the modification method in the step 1) is to completely immerse the fabric in a phytic acid solution at the liquid temperature of 40-80 ℃ for 30-60 min, take out the fabric after the modification, clean and dry the fabric.
6. 6. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 5, wherein the bath ratio in the modification method of the step 1) is 1:20-1:50.
7. 7. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 5, wherein the berberine plant dye is stirred in a vibrating manner during the dipping process.
8. 8. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 7, wherein the rotating speed of the vibration stirring is 100rpm-160rpm.
9. 9. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 1, wherein the berberine plant dye in the step 2) has the concentration of 2% -8% (o.w.f), the bath ratio of 1:30-1:60, the pH value of 4-6, the dyeing temperature of 60-80 ℃ and the dyeing time of 30-60 min.
10. 10. The method for improving the color fastness of the berberine plant dye on the fabric according to claim 9, wherein the regulator of the pH of the dye solution is acetic acid.

Description

Method for improving color fastness of berberine vegetable dye on fabric Technical Field The invention relates to the technical field of dyeing and finishing, in particular to a method for improving the color fastness of berberine vegetable dye on fabric. Background Berberine, also known as berberine, is a quaternary ammonium alkaloid extracted from plants such as Coptidis rhizoma, cortex Phellodendri, etc. As natural vegetable dye, berberine is considered to be more environment-friendly than synthetic dye, is the only cationic dye in the natural dye, can endow the fabric with bright yellow color, has antibacterial property and certain ultraviolet resistance, and has wide commercial application value in textile industry. The dyeing process of berberine on the fabric mainly comprises direct dyeing and mordant dyeing: By adopting the direct dyeing method, the berberine dye has weak binding force with cotton or lyocell fabric (neutral) due to positively charged berberine in water, and has the problems of low dye-uptake, low color fastness (especially the color fastness such as friction resistance, soaping resistance, light resistance and the like) and the like. The mordant dyeing method is mainly used for treating cotton or lyocell fiber fabrics by using a traditional mordant containing transition metal ions so as to improve the dyeing rate and dyeing depth of natural dye berberine on the cotton fabrics; after dyeing, the natural dye berberine molecules and heavy metal ions form a complex on the fiber, but by adopting the method, mordant such as ferric salt, aluminum salt, copper salt and the like is needed, and a series of problems such as easy precipitation of dye liquor exist, so that the full-process green environment-friendly preparation and production of the natural plant dyed fabric cannot be realized, and the method does not accord with the market mainstream and trend of developing textiles such as ecological clothing, full-green clothing and the like. Based on the above, in order to fully excavate the application of berberine green plant dye in textile, it is important to develop a method for improving the color fastness of berberine on the textile. Disclosure of Invention The invention aims to provide a method for improving the color fastness of berberine vegetable dye on fabric, which can obviously improve the color fastness of berberine vegetable dye on cotton or lyocell fiber fabric. In order to achieve the aim of the invention, the invention adopts the following technical scheme: the method for improving the color fastness of the berberine vegetable dye on the fabric comprises the following steps: 1) Before dyeing, modifying the fabric by using a phytic acid solution to obtain a phytic acid modified fabric; 2) And during dyeing, the berberine plant dye is used for dyeing and washing the phytic acid modified fabric. Preferably, the fabric is a pure cotton fabric, a pure lyocell fabric or a cotton/lyocell blend fabric. Preferably, the fabric is a knitted fabric or a woven fabric. Preferably, the solvent of the phytic acid solution is water, and the concentration of the phytic acid is 3-10%. Preferably, the modification method in the step 1) is to completely immerse the fabric in a phytic acid solution at the liquid temperature of 40-80 ℃ for 30-60 min, take out the fabric after modification, wash and dry the fabric. Preferably, the bath ratio in the modification method of the step 1) is 1:20 to 1:50. Preferably, the agitation is vibratory during the impregnation process. Preferably, the rotational speed of the vibration stirring is 100rpm to 160rpm. Preferably, the berberine plant dye concentration in the step 2) is 2% -8% (o.w.f), the bath ratio is 1:30-1:60, the pH value is 4-6, the dyeing temperature is 60-80 ℃, and the dyeing time is 30-60 min. Preferably, the regulator of the pH of the dye liquor is acetic acid. Compared with the prior art, the invention has the following beneficial effects 1) The invention adopts a stepwise process of firstly modifying the fabric by phytic acid and then dyeing, can fully exert the modifying effect of the phytic acid, and avoids the acid-base reaction of the phytic acid which is acidic and the berberine plant dye which is alkaline in one-bath dyeing. In the invention, 6 phosphoric acids are contained on the molecular structure of the phytic acid, the phytic acid and cotton or lyocell fiber fabric are subjected to chemical reaction, the phosphoric acid on the phytic acid and the cotton or lyocell fiber fabric are combined through a phosphate bond, and the unreacted phosphoric acid in a dye liquor is ionized to form H +, so that the whole cotton or lyocell fiber fabric after the phytic acid modification is negatively charged, a plurality of unreacted phosphate ions on the fabric can greatly increase the combining site with the positively charged berberine plant dye, the dyeing rate of the berberine plant dye on the fabric is improved, the color fastness of the f