Dyeing process for improving color matching fastness of plant dyeing

Abstract

The invention belongs to the technical field of textile fabric dyeing processes, and particularly relates to a dyeing process for improving color matching fastness of plant dyeing. The dyeing process comprises the following process steps: scouring and bleaching the fabric, pickling, modifying, dyeing, fixing color, softening and tentering and setting. The fabric is modified, so that the vegetable dye and the fabric are better combined, the purpose of improving the color fastness is achieved, and the fabric has better color and keeps performance. According to the dyeing method disclosed by the invention, the color fastness of plant dyeing can be remarkably improved, especially in the aspects of washing resistance and light resistance. The dyed fabric can still keep the original color after being washed for multiple times and exposed to light for a long time, the service life of the fabric is prolonged, and the replacement frequency caused by color fading is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of textile fabric dyeing technology, and in particular relates to a dyeing technology for improving the color fastness of plant dyeing color combination. Background Art

[0002] As an important pillar of modern industry, chemical dyes dominate the fields of textiles and printing, but their shortcomings cannot be ignored. The production process of chemical dyes is prone to produce harmful substances, posing a threat to the environment and ecology. Moreover, they are poorly degradable and tend to remain in the environment for a long time. In addition, some chemical dyes are toxic and carcinogenic, posing a potential risk to human health.

[0003] In contrast, plant dyes have significant advantages. Plant dyes are derived from natural plants, are non-toxic and harmless, and are environmentally friendly. They have natural and soft colors, good biodegradability, and will not cause long-term pollution to the environment. In addition, plant dyes can also give textiles natural fragrance and special functions in textile applications, such as antibacterial and insect repellent.

[0004] With the improvement of environmental awareness and consumers' attention to health and safety, plant dyes have broad development prospects. However, the color matching effect and color fixation effect of the existing plant dyeing technology, especially the light fastness, are not good. Summary of the invention

[0005] In order to solve the problems existing in the above-mentioned prior art, the present invention provides a dyeing process for improving the color fastness of plant-dyed splicing colors. The present invention aims to solve the shortcomings of the existing plant dyeing technology in terms of splicing color fastness and color fixing effect. Through innovative dyeing processes and formulas, the uniform penetration and firm bonding of plant dyes on fabrics are achieved, thereby significantly improving the color fastness of splicing fabrics.

[0006] To achieve the above object, the present invention adopts the following technical solution:

[0007] A dyeing process for improving the color fastness of plant dyeing, specifically comprising the following process steps:

[0008] (1) Practice drifting:

[0009] Hydrogen peroxide is 10-12g / L (concentration: 27.5%), caustic soda 3.0g / L is used to adjust pH, Sn286 is 0.5-1g / L, the grey cloth is bleached at 70℃-95℃ for 20-30 minutes, washed with water for 5-10 minutes, and then cooled and drained. Sn286 is an anionic auxiliary agent, mainly used to improve permeability, and has the effect of decontamination and washing, and emulsifies the dye.

[0010] (2) Pickling

[0011] Add 0.5-1g / L enzyme, acid wash at 50-70℃ for 20-30 minutes and then drain. After draining, rinse the fabric to make the pH of the fabric 6.5-7.5; the enzyme used is an anionic additive.

[0012] (3) Modification

[0013] Add JL1 0.5-1g / L, keep the solution pH at 7, treat at 70-80℃ for 30-40 minutes, then cool down and drain, and wash again at 70-80℃ for 10-15 minutes. JL 1 is a weak cationic auxiliary, mainly used for color fixation and medium effect.

[0014] (4) Dyeing

[0015] Select 2-3 dyes for color matching, then add Sn258, Sn286 and adjust the pH to 8-10, then add the dyes after adjusting the pH, add before 40℃, then slowly increase the temperature, try to add slowly, the purpose of adding salt is to accelerate the combination between the dye and the fiber, add salt according to the coloring of the dye, make the dye fully dyed, add acid after the dye is completely absorbed, adjust the pH to 5-7, cool down and drain. Sn258 is non-ionic and is mainly used for slow dyeing and dispersion.

[0016] (5) Color fixation

[0017] After dyeing, cool down and drain the water, then add water, add JL1 0.5-1g / L, fix the color at 70-90℃ for 20-30 minutes, after fixing, heat the water to 40-50℃ and wash for 10-15 minutes.

[0018] (6) Softness

[0019] After padding with softener, keep warm at 50-60℃ for 15-20 minutes.

[0020] (7) Tentering and shaping

[0021] The finished fabric is fed into the machine through the edge stripper, and the two ends of the fabric are fixed on the needle plate. The fabric is fed into the oven through the moving belt of the needle plate, and passes through several constant temperature ovens with different temperatures, and then the tail end is cooled and static electricity is removed. The fabric falls into the fabric car and is shaped.

[0022] The invention modifies the fabric so that the plant dye is better combined with the fabric, thereby achieving the purpose of improving the color fastness and allowing the fabric to have better color and maintain performance.

[0023] Beneficial Effects

[0024] The present invention discloses a dyeing process for improving the color fastness of plant dyeing. The dyeing method of the present invention can significantly improve the color fastness of plant dyeing, especially in terms of washing fastness and light fastness. The dyed fabric can still maintain its original color after multiple washings and long-term exposure to light, thereby extending the service life of the fabric and reducing the replacement frequency caused by color fading.

[0025] The present invention uses plant dyes for dyeing, which are derived from nature, are degradable and environmentally friendly. Although the initial purchase cost of plant dyes may be higher than some synthetic dyes, due to their high color fastness, rework and waste caused by insufficient color fastness are reduced, thereby saving costs in the entire production process. In addition, due to the increasingly stringent environmental regulations, the use of plant dyes can avoid potential environmental fines, further reducing long-term costs.

[0026] The dyeing method of the present invention can produce plant-dyed textiles with better color fastness. This differentiation strategy can help companies stand out in a highly competitive market and attract more consumers who value quality and sustainability. The dyeing method of the present invention embodies innovation and improvement of traditional plant dyeing technology, and improves the dyeing effect through scientific methods. DETAILED DESCRIPTION

[0027] Hereinafter, the present invention will be described in detail. Before describing, it should be understood that the terms used in this specification and the appended claims should not be interpreted as being limited to the general meaning and dictionary meaning, but should be interpreted according to the meaning and concept corresponding to the technical aspects of the present invention on the basis of the principle that the inventor is allowed to appropriately define the terms for the best interpretation. Therefore, the descriptions presented here are only preferred examples for illustrative purposes and are not intended to limit the scope of the present invention, so that it should be understood that other equivalents or improvements can be obtained therefrom without departing from the spirit and scope of the present invention.

[0028] The following examples are only listed as examples of embodiments of the present invention and do not constitute any limitation to the present invention. It can be understood by those skilled in the art that modifications within the scope of the essence and concept of the present invention fall within the scope of protection of the present invention. Unless otherwise specified, the reagents and instruments used in the following examples are all commercially available products.

[0029] The plant dyes described in the present invention were purchased from China Textile Science Research Institute Co., Ltd., and other reagents were purchased from Maclean's official website. The instrument used to test the color fastness of fabrics was developed by Shandong Textile Science Research Institute, model LFY-302; the sun exposure climate test machine was developed by Wenzhou Textile Instrument Factory, model YG(B)611-6.

[0030] Example 1

[0031] A dyeing process for improving the color fastness of plant dyeing, specifically comprising the following process steps:

[0032] Step 1: The hydrogen peroxide used for fabric bleaching is 12g / L (concentration: 27.5%), 3.0g / L of caustic soda is used to adjust the pH, and 1g / L of Sn286. The grey cloth is bleached at 90℃ for 30 minutes, washed with water for 10 minutes, and then cooled and drained.

[0033] Step 2: Add 0.5g / L enzyme to the fabric for acid washing. Wash at 55℃ for 30 minutes and then drain. Rinse the fabric after draining to make the pH value of the fabric about 7.

[0034] Step 3: Fabric modification, add JL 1 at 1g / L, solution pH = 7, treat at 80℃ for 30 minutes, then cool and drain, and wash again at 80℃ for 10 minutes.

[0035] Step 4: When dyeing the fabric, choose 3 kinds of plant dyes for color matching, then add Sn258, Sn286 and adjust the pH to 9. After adjusting the pH, add the dye, add it before 40℃, then slowly increase the temperature, and add it as slowly as possible. The purpose of adding salt is to accelerate the combination of dye and fiber. Add salt according to the coloring of the dye to make the dye fully dyed. Add acid after the dye is absorbed, adjust the pH to 7, cool down and drain.

[0036] Step 5: After dyeing, the fabric is cooled and drained, then water is added, and 0.5g / L of JL1 is added. The color is fixed at 80℃ for 20 minutes. After the color is fixed, the water is heated to 50℃ and washed for 10 minutes.

[0037] Step 6: After padding with softener, keep warm at 50℃ for 15 minutes.

[0038] Step 7: Feed the finished fabric into the machine through the edge stripper, and fix the two ends of the fabric on the needle plate. The fabric is fed into the oven through the moving belt of the needle plate, and passes through several constant temperature ovens with different temperatures, namely 65℃, 75℃, and 90℃, and then the tail is cooled and static electricity is removed. The fabric falls into the fabric car and is finalized.

[0039] Example 2

[0040] A dyeing process for improving the color fastness of plant dyeing, specifically comprising the following process steps:

[0041] Step 1: The hydrogen peroxide used for fabric bleaching is 10g / L (concentration: 27.5%), 3.0g / L of caustic soda is used to adjust the pH, and 0.5g / L of Sn286. The grey cloth is bleached at 90℃ for 30 minutes, washed with water for 10 minutes, and then cooled and drained.

[0042] Step 2: Add 0.5g / L enzyme to the fabric for acid washing. Wash at 55℃ for 30 minutes and then drain. Rinse the fabric after draining to make the pH value of the fabric about 7.

[0043] Step 3: Fabric modification, add JL1 at 0.5g / L, solution pH = 7, treat at 80℃ for 30 minutes, then cool and drain, and wash again at 80℃ for 10 minutes.

[0044] Step 4: When dyeing the fabric, choose 3 kinds of plant dyes for color matching, then add Sn258 and Sn286 to adjust the pH to 9. After adjusting the pH, add the dye before 40°C, then slowly increase the temperature, and add it as slowly as possible. The purpose of adding salt is to accelerate the combination of the dye and the fiber. Add salt according to the coloring of the dye to make the dye fully dyed. Add acid after the dye is absorbed, adjust the pH to 7, cool down and drain.

[0045] Step 5: After dyeing, the fabric is cooled and drained, then water is added, and 0.5g / L of JL1 is added. The color is fixed at 80℃ for 20 minutes. After the color is fixed, the water is heated to 50℃ and washed for 10 minutes.

[0046] Step 6: After padding with softener, keep warm at 50℃ for 15 minutes.

[0047] Step 7: Feed the finished fabric into the machine through the edge stripper, and fix the two ends of the fabric on the needle plate. The fabric is sent into the oven through the moving belt of the needle plate, and passes through several constant temperature ovens with different temperatures, namely 60℃, 80℃, and 95℃, and then the tail is cooled and static electricity is removed. The fabric falls into the fabric car and is finalized.

[0048] Example 3

[0049] A dyeing process for improving the color fastness of plant dyeing, specifically comprising the following process steps:

[0050] Step 1: The hydrogen peroxide used for fabric bleaching is 11g / L (concentration: 27.5%), 3.0g / L of caustic soda is used to adjust the pH, and 0.8g / L of Sn286. The grey cloth is bleached at 95℃ for 25 minutes, washed with water for 8 minutes, and then cooled and drained.

[0051] Step 2: Add 0.8g / L enzyme to the fabric for acid washing. Wash at 70℃ for 25 minutes and then drain. Rinse the fabric after draining to make the pH value of the fabric about 7.5.

[0052] Step 3: Fabric modification, add JL1 at 0.8g / L, solution pH = 7, treat at 75℃ for 35 minutes, then cool and drain, and wash again at 75℃ for 12 minutes.

[0053] Step 4: When dyeing the fabric, choose 2 kinds of plant dyes for color matching, then add Sn258 and Sn286 and adjust the pH to 10. After adjusting the pH, add the dye before 40℃, then slowly increase the temperature, and add it as slowly as possible. The purpose of adding salt is to accelerate the combination of dye and fiber. Add salt according to the coloring of the dye to make the dye fully dyed. Add acid after the dye is absorbed, adjust the pH to 6, cool down and drain.

[0054] Step 5: After dyeing, the fabric is cooled and drained, then water is added, 0.8g / L of JL1 is added, and the color is fixed at 90℃ for 25 minutes. After the color is fixed, the water is heated to 45℃ and washed for 12 minutes.

[0055] Step 6: After padding with softener, keep warm at 55℃ for 15 minutes.

[0056] Step 7: Feed the finished fabric into the machine through the edge stripper, and fix the two ends of the fabric on the needle plate. The fabric is fed into the oven through the moving belt of the needle plate, and passes through several constant temperature ovens with different temperatures, which are 70℃, 70℃, and 80℃ respectively, and then the tail is cooled and static electricity is removed. The fabric falls into the fabric car and is finalized.

[0057] Comparative Example

[0058] A dyeing process, specifically comprising the following process steps:

[0059] Step 1: The hydrogen peroxide used for fabric scouring and bleaching is 10g / L (concentration: 27.5%), 3.0g / L of caustic soda is used to adjust the pH, the grey cloth is bleached at 90°C for 30 minutes, washed with water for 10 minutes, and then cooled and drained.

[0060] Step 2: When dyeing the fabric, choose 3 kinds of plant dyes for color matching. After adjusting the pH, add the dye before 40℃, then slowly increase the temperature and add it as slowly as possible. The purpose of adding salt is to accelerate the combination of dye and fiber. Add salt according to the coloring of the dye to make the dye fully dyed. Add acid after the dye is absorbed, adjust the pH to 7, cool down and drain.

[0061] Step 3: After dyeing, the fabric is cooled and drained, then put into water and fixed at 80℃ for 20 minutes. After fixing, the water is heated to 50℃ and washed for 10 minutes.

[0062] Step 4: After padding with softener, keep warm at 50℃ for 15 minutes.

[0063] Step 5: Feed the finished fabric into the machine through the edge stripper, and fix the two ends of the fabric on the needle plate. The fabric is fed into the oven through the moving belt of the needle plate, and passes through several constant temperature ovens with different temperatures, which are 60-70℃, 70-80℃, and 80-95℃, and then the tail is cooled and static electricity is removed. The fabric falls into the fabric car and is shaped.

[0064] Experimental example

[0065] In order to prove the beneficial effects of the process of the present invention compared with the prior art, the following experimental tests are carried out:

[0066] Water fastness test

[0067] Method: Soak a dyed fabric sample of a certain size in distilled water at a specified temperature for a certain period of time, then take it out and dry it. Use a gray sample card to compare the color change of the immersion liquid (staining) and the color change of the fabric itself (discoloration) to assess the color fastness grade. The specific test results are shown in Table 1 below.

[0068] Acid and alkali perspiration color fastness test

[0069] Method: Simulate the composition of human sweat (acidic and alkaline), soak the fabric sample in artificial sweat, and then treat it at a specific temperature and time. Afterwards, use the gray sample card to compare the color change of the fabric and the immersion liquid to evaluate the color fastness grade. The specific test results are shown in Table 1 below.

[0070] Color fastness to rubbing test

[0071] Dry rubbing: Use a dry white rubbing cloth to rub the fabric sample a certain number of times under a certain pressure.

[0072] Wet rubbing: Use a wet white rubbing cloth to rub against the fabric sample under the same conditions.

[0073] Method: After rubbing, compare the color staining on the rubbing cloth and evaluate the color fastness grade. The specific test results are shown in Table 1 below.

[0074] Light fastness test

[0075] Method: Use a xenon lamp or ultraviolet light source to simulate natural light to irradiate the fabric sample, and irradiate according to the set time and intensity. After irradiation, compare the color change of the fabric and evaluate the color fastness grade. The specific test results are shown in Table 1 below.

[0076] Table 1. Color fastness test results of plant dyeing

[0077]

[0078] According to the experimental results in Table 1, the color fastness results of the fabrics obtained by the dyeing process described in Examples 1-3 of this patent are better than those of the comparative example. The reason is that the dyeing process described in this patent can better combine the plant dye with the fabric, thereby achieving the purpose of improving color fastness, allowing the fabric to have better color and maintain performance.

[0079] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for a person skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to replace some of the technical features therein by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions claimed to be protected by the present invention.

Claims

1. A dyeing process for improving the color fastness of plant dyeing, characterized in that: The process includes the following steps: scouring and bleaching the fabric → acid washing → modification → dyeing → color fixing → softening → stentering and shaping.

2. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The scouring and bleaching process is specifically as follows: the grey cloth is bleached at 70°C-95°C for 20-30 minutes, then washed with water for 5-10 minutes, and then cooled and drained; the bleaching solution used includes the following components: 10-12 g / L of 27.5% hydrogen peroxide, 3.0 g / L of caustic soda, and 0.5-1 g / L of Sn286.

3. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The pickling process is specifically as follows: adding 0.5-1g / L of enzyme, pickling at 50-70°C for 20-30 minutes and then draining the water, and then rinsing the fabric after draining the water to make the pH of the fabric 6.5-7.5; the enzyme used is an anionic auxiliary agent.

4. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The modification process is specifically as follows: adding JL1 0.5-1 g / L, maintaining the solution pH at 7, treating at 70-80° C. for 30-40 minutes, then cooling and draining, and washing again at 70-80° C. for 10-15 minutes.

5. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The dyeing process is specifically as follows: 2-3 dyes are selected for color matching, then Sn258 and Sn286 are added and the pH is adjusted to 8-10, the dye is added after the pH is adjusted, and the temperature is added before 40°C, and then the temperature is slowly increased, and the addition is as slow as possible. After the dye is completely absorbed, acid is added, the pH is adjusted to the range of 5-7, and the temperature is reduced and the water is discharged.

6. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The color fixing process is specifically as follows: after dyeing, cooling and draining are performed, water is added again, 0.5-1 g / L of JL1 is added, and the color is fixed at 70-90° C. for 20-30 minutes. After the color is fixed, the water is heated to 40-50° C. and washed for 10-15 minutes.

7. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The softening process is specifically as follows: after padding the softener, the material needs to be kept warm at 50-60°C for 15-20 minutes.

8. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 1, characterized in that: The tentering shaping process is specifically as follows: the finished fabric is fed into the machine in a flat width through the edge stripper, and the two ends of the fabric are fixed on the needle plate; the fabric is fed into the oven through the moving belt of the needle plate, and passes through several constant temperature ovens with different temperatures, and then the tail end is cooled and static electricity is removed; the fabric falls into the fabric cart to complete the shaping.

9. The dyeing process for improving the color fastness of plant dyeing color combination according to claim 8, characterized in that: The stentering and setting process passes through several constant temperature ovens with different temperatures, and the temperatures of the ovens are 60-70°C, 70-80°C, and 80-95°C respectively.

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