A method for dyeing cashmere / wool fabric with plant dyes to improve its light fastness

Abstract

The application discloses a plant dye dyeing method for improving the sunlight fastness of cashmere / wool fabric, which comprises the following steps: (1) dyeing cashmere / wool fabric by using plant dyes; (2) mordanting the dyed cashmere / wool fabric in a mixed solution of ferrous sulfate and gallnut, taking out after mordanting, and washing clean; (3) soaping the mordanted cashmere / wool fabric, washing clean after soaping, and drying. After the cashmere / wool fabric is dyed by using plant extract, the dyed cashmere / wool fabric is immersed in a mixed solution of ferrous sulfate and gallnut, so that the ferrous sulfate and the gallnut form hydrogen bonds and coordination bonds with cashmere / wool fibers and plant pigments, thereby improving the sunlight fastness of the cashmere / wool fabric.

Description

A plant-based dyeing method to improve the light fastness of cashmere / wool fabrics Technical Field

[0001] This invention belongs to the field of textile dyeing and finishing, and specifically relates to a method for dyeing cashmere / wool fabrics with plant dyes to improve the light fastness. Background Technology

[0002] With the development of technology and the improvement of living standards, people have become increasingly aware of the concepts of healthy living and sustainable development, making natural dyes and their dyed textiles highly popular among consumers. Natural dyes are derived from nature, possessing excellent biodegradability and environmental compatibility. Dyed fabrics exhibit soft colors, and some natural dyes are derived from traditional Chinese medicine, offering excellent antibacterial, antiviral, and UV-resistant health benefits. Cashmere, as a high-performance protein fiber, boasts numerous superior wearing properties, including a soft hand feel, good luster, and excellent elasticity. Therefore, naturally dyed cashmere fibers, as a green and eco-friendly healthy textile, have broad market prospects.

[0003] Natural dyes are favored by consumers for their non-toxicity, naturalness, soft colors, good environmental compatibility, and biodegradability.

[0004] Due to the limited availability of natural dyes, the color range of dyed fabrics is relatively limited, resulting in insufficient color spectrum, especially poor light fastness, which seriously restricts the development of plant dyes. Summary of the Invention

[0005] The purpose of this invention is to provide a plant dyeing method for improving the light fastness of cashmere / wool fabrics. In view of the defects in the prior art, after dyeing cashmere with plant extracts, the dyed cashmere is immersed in a mixed solution of ferrous sulfate and gallnut, so that ferrous sulfate and gallnut form hydrogen bonds and coordination bonds with cashmere fibers and plant pigments, which significantly improves the light fastness of cashmere / wool.

[0006] To solve the above-mentioned technical problems, the following technical solution is adopted.

[0007] A method for dyeing cashmere / wool fabrics with plant dyes, characterized by comprising the following steps:

[0008] (1) Dyeing cashmere / wool fabrics with plant dyes;

[0009] (2) Mordant dye the dyed cashmere / wool fabric in a mixed solution of ferrous sulfate and gallnut, remove it after mordant dyeing, and wash it with water.

[0010] (3) Soap wash the mordanted cashmere / wool fabric, then wash and dry it.

[0011] After optimization, in step (1), the plant dye is selected from one of the following: orange peel extract dye, peanut skin extract dye, grape seed extract dye, tea extract dye or yam extract dye.

[0012] After optimization, the dyeing process in step (1) is as follows: the amount of plant dye used is 1-4% of the mass of cashmere / wool fabric, the mass concentration of acetic acid is 1g / L, the liquor ratio is 1:50, the dyeing temperature is 95℃, and the dyeing time is 60min.

[0013] After optimization, in step (2), the amount of ferrous sulfate used is 1-4% of the mass of the cashmere / wool fabric.

[0014] After optimization, in step (2), the amount of gallnut used is 1-4% of the mass of the cashmere / wool fabric.

[0015] After optimization, in step (2), the mordant temperature is 60℃ and the mordant time is 30min.

[0016] After optimization, the soap washing process in step (3) is as follows: bath ratio 1:50, temperature 60℃, and time 20min.

[0017] The above technical solution has the following beneficial effects:

[0018] 1. This invention proposes a method to improve the light fastness of cashmere / wool dyed with plant extracts, namely, after dyeing cashmere / wool with plant extracts, immersing the dyed cashmere / wool in a mixed solution of ferrous sulfate and gallnut, so that ferrous sulfate and gallnut form hydrogen bonds and coordination bonds with cashmere / wool fibers and plant pigments, thereby improving the light fastness of cashmere / wool.

[0019] 2. The extracts of orange peel, peanut skin, grape seed, tea, and yam are all extracted using a mixture of cellulase, pectinase, and alcohol-water solution. The extraction process is simple, environmentally friendly, and greatly improves the dye extraction efficiency.

[0020] 3. By preparing an extract from waste materials and treating it with ferrous sulfate and gallnut, cashmere / wool fibers with high lightfastness are obtained. These fibers are comfortable to wear and do not pose any carcinogenic, teratogenic, or allergic reactions risks. They are also biodegradable and have good compatibility with the environment. The waste materials are readily available and inexpensive, making full use of natural resources and indicating a very promising market prospect. Detailed Implementation

[0021] The present invention aims to provide a plant dyeing method for improving the light fastness of cashmere / wool fabrics. After dyeing cashmere with plant extracts, the dyed cashmere is immersed in a mixed solution of ferrous sulfate and gallnut, so that ferrous sulfate and gallnut form hydrogen bonds and coordination bonds with cashmere fibers and plant pigments, which significantly improves the light fastness of cashmere / wool.

[0022] The technical solution of the present invention will be described in detail below with reference to specific embodiments:

[0023] The plant dyes used in the following examples were extracted using a mixture of cellulase, pectinase, and an alcohol-water solution.

[0024] Example 1:

[0025] (1) Use 3% (owf) of orange peel dye, add 1g / L of acetic acid, bath ratio 1:50, and dye cashmere at 95℃ for 60min.

[0026] (2) Immerse the dyed cashmere in a mixed solution of 2-4% ferrous sulfate (owf) and 1-3% gallnut (owf) at 60℃ for 30 minutes. Remove and wash thoroughly with water.

[0027] (3) Soap wash the treated cashmere with a bath ratio of 1:50, a temperature of 60℃ and a time of 20min. After soap washing, wash the cashmere and dry it.

[0028] (4) The light fastness of the orange peel dye on cashmere was measured as follows:

[0029] Ferrous sulfate 4% + gallnut 1% light fastness grade 3;

[0030] Ferrous sulfate 3% + 2% gallnut, light fastness grade 3;

[0031] Ferrous sulfate 2% + 3% gallnut, light fastness grade 3;

[0032] Using only 5% ferrous sulfate as a mordant, the light fastness is only grade 1.

[0033] Example 2:

[0034] (1) Use 2% peanut skin dye (owf), add 1g / L acetic acid, bath ratio 1:50, and dye cashmere at 95℃ for 60min;

[0035] (2) Immerse the dyed cashmere in a mixture of 1-4% ferrous sulfate (owf) and 1-4% gallnut (owf) at 60°C for 30 minutes. Remove and wash thoroughly with water.

[0036] (3) Soap wash the treated cashmere with a bath ratio of 1:50, a temperature of 60℃ and a time of 20min. After soap washing, wash the cashmere and dry it.

[0037] (4) The light fastness of the dyed cashmere peanut skin was measured as follows:

[0038] Ferrous sulfate 4% + gallnut 1% light fastness grade 3;

[0039] Ferrous sulfate 3% + gallnut 2% light fastness grade 3-4;

[0040] Ferrous sulfate 2% + 3% gallnut: light fastness grade 3-4;

[0041] Ferrous sulfate 1% + 4% gallnut: light fastness grade 3-4;

[0042] Using only 5% ferrous sulfate as a mordant, the light fastness is only grade 1-2.

[0043] Example 3:

[0044] (1) Use 2% grape seed dye (owf), add 1g / L acetic acid, bath ratio 1:50, and dye cashmere at 95℃ for 60min.

[0045] (2) Immerse the dyed cashmere in a mixed solution of 1-4% ferrous sulfate (owf) and 1-4% gallnut (owf) at 60°C for 30 minutes. Remove and wash thoroughly with water.

[0046] (3) Soap wash the treated cashmere with a bath ratio of 1:50, a temperature of 60℃ and a time of 20min. After soap washing, wash the cashmere and dry it.

[0047] (4) The light fastness of the cashmere grape seed dye was measured as follows:

[0048] Ferrous sulfate 4% + gallnut 1% light fastness grade 3;

[0049] Ferrous sulfate 3% + gallnut 2% light fastness grade 3-4;

[0050] Ferrous sulfate 2% + 3% gallnut: light fastness grade 3-4;

[0051] Ferrous sulfate 1% + 4% gallnut: light fastness grade 3-4;

[0052] Using only 5% ferrous sulfate as a mordant, the light fastness is only grade 1-2.

[0053] Example 4:

[0054] (1) Use 2% (owf) of tea dye, add 1g / L acetic acid, bath ratio 1:50, and dye cashmere at 95℃ for 60min.

[0055] (2) Immerse the dyed cashmere in a mixed solution of 1-4% ferrous sulfate (owf) and 1-4% gallnut (owf) at 60°C for 30 minutes. Remove and wash thoroughly with water.

[0056] (3) Soap wash the treated cashmere with a bath ratio of 1:50, a temperature of 60℃ and a time of 20min. After soap washing, wash the cashmere and dry it.

[0057] The light fastness of cashmere dyed with tea leaves was measured as follows:

[0058] Ferrous sulfate 4% + gallnut 1% light fastness grade 3;

[0059] Ferrous sulfate 3% + gallnut 2% light fastness grade 3-4;

[0060] Ferrous sulfate 2% + 3% gallnut: light fastness grade 3-4;

[0061] Ferrous sulfate 1% + 4% gallnut: light fastness grade 3-4;

[0062] Using only 5% ferrous sulfate as a mordant, the light fastness is only grade 1-2.

[0063] Example 5:

[0064] (1) Use 2% (owf) of yellow yam dye, add 1g / L acetic acid, bath ratio 1:50, and dye cashmere at 95℃ for 60min;

[0065] (2) Immerse the dyed cashmere in a mixed solution of 1-4% ferrous sulfate (owf) and 1-4% gallnut (owf) at 60°C for 30 minutes. Remove and wash thoroughly with water.

[0066] (3) Soap wash the treated cashmere with a bath ratio of 1:50, a temperature of 60℃ and a time of 20min. After soap washing, wash the cashmere and dry it.

[0067] The light fastness of the dyeing of cashmere with yam beetle was measured as follows:

[0068] Ferrous sulfate 4% + gallnut 1% light fastness grade 2;

[0069] Ferrous sulfate 3% + 2% gallnut, light fastness grade 3;

[0070] Ferrous sulfate 2% + 3% gallnut, light fastness grade 3;

[0071] Ferrous sulfate 1% + 4% gallnut, light fastness grade 3;

[0072] Using only 5% ferrous sulfate as a mordant, the light fastness is only grade 1.

[0073] The above are merely specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent substitutions, or modifications made based on the present invention to solve essentially the same technical problems and achieve essentially the same technical effects are all covered within the protection scope of the present invention.

Claims

1. A method for dyeing cashmere / wool fabrics with plant dyes to improve their light fastness, characterized in that... The steps include: (1) dyeing cashmere / wool fabric with plant dyes; the plant dyes selected are orange peel extract dye, peanut skin extract dye, grape seed extract dye, tea extract dye or yam extract dye; the dyeing process is: the amount of plant dye is 1-4% of the mass of cashmere / wool fabric, the mass concentration of acetic acid is 1g / L, the bath ratio is 1:50, the dyeing temperature is 95℃, and the dyeing time is 60min; (2) mordanting the dyed cashmere / wool fabric in a mixed solution of ferrous sulfate and gallnut, taking it out after mordanting, and washing it clean with water; the amount of ferrous sulfate is 1-4% of the mass of cashmere / wool fabric; (3) soaping the mordanted cashmere / wool fabric, washing it clean after soaping, and drying it.

2. The plant dyeing method for improving the light fastness of cashmere / wool fabrics according to claim 1, characterized in that: In step (2), the amount of gallnut used is 1-4% of the weight of the cashmere / wool fabric.

3. The method for dyeing cashmere / wool fabrics with plant dyes to improve light fastness according to claim 1, characterized in that: In step (2), the mordant temperature is 60℃ and the mordant time is 30min.

4. The plant dyeing method for improving the light fastness of cashmere / wool fabrics according to claim 1, characterized in that: The step (3), soap washing process: bath ratio 1:50, temperature 60℃, time 20min.