Application method of tea polyphenol dyeing process on bamboo fiber product

Abstract

The invention relates to an application method of a tea polyphenol dyeing process on a bamboo fiber product, and relates to the technical field of bamboo fiber product dyeing, the application method comprises the following steps: S1, bamboo fiber product pretreatment, S2, tea polyphenol dyeing liquid preparation, S3, dyeing treatment, and S4, fixation treatment. According to the design, the tea polyphenol dyeing process is creatively applied to the bamboo fiber product, the diversity of the tea polyphenol dyeing process is effectively expanded, and a theoretical basis is provided for artistic creation of the bamboo fiber product.

Description

Technical Field

[0001] The present invention relates to the technical field of bamboo fiber product dyeing, in particular to the field of an application method of a tea polyphenol dyeing process on bamboo fiber products. Background Art

[0002] Bamboo fiber is a cellulose fiber extracted from naturally grown bamboo. Bamboo fiber has good air permeability, instant water absorption, strong wear resistance and good dyeability. It has natural antibacterial, antimicrobial, mite-removing, odor-resistant and UV-resistant functions. With the development of the times, consumers have increasingly higher requirements for the dyeing of paper fiber products. For example, the patent document with publication number: CN116121897A, patent name: A method for preparing bamboo pulp fiber dyed with plant indigo dye, discloses a method for preparing bamboo pulp fiber dyed with plant indigo dye. Utilizing the redox properties of indigo dye and the high binding strength of indigo dye with protein, indigo dye, protein and a reducing agent are directly added to the bamboo pulp fiber spinning solution during the bamboo pulp fiber preparation process. During the bamboo pulp fiber preparation process, the indigo dye is reduced to water-soluble indigo white, which is evenly dispersed in the spinning solution and dyed onto the protein particles. When the fiber solidifies, the protein and indigo white are evenly solidified into the fiber and are not easy to fall off.

[0003] However, there is little research on the use of tea polyphenols dyeing technology on bamboo fiber products in the market. Therefore, this application aims to study the application of tea polyphenols dyeing technology on bamboo fiber products and fill the gap in this field. Summary of the Invention

[0004] The purpose of the present invention is to provide an application method of tea polyphenol dyeing process on bamboo fiber products. The present invention provides the following technical solution: a method for applying a tea polyphenol dyeing process to bamboo fiber products, the method comprising the following steps: S1. Pretreatment of bamboo fiber products: Immerse the bamboo fiber products in solution A for 30-40 minutes, maintain the temperature at 60-65°C, rinse repeatedly with deionized water until the pH value reaches 6.6-7.6, immerse the rinsed bamboo fiber products in solution B for 40-50 minutes for bleaching, maintain the temperature at 50-60°C, dehydrate after bleaching, and dry for 30 minutes after dehydration; S2. Preparation of tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves with water for 30 minutes, maintaining the temperature at 95-100° C., filtering the tea leaves with a 200-mesh filter cloth after boiling to obtain a tea polyphenol dyeing solution, adding a metal mordant to the tea polyphenol dyeing solution, and adjusting the pH value of the tea polyphenol dyeing solution with citric acid, wherein the mass ratio of the tea leaves to the water is 1:15-1:20; S3, dyeing treatment: the pretreated bamboo fiber product and the tea polyphenol dyeing solution are placed in a dyeing machine, the initial temperature is controlled at 50 ° C, and the temperature is uniformly increased at a rate of 1.5 ° C / min to a target temperature of 85-90 ° C, and dyeing is carried out at the target temperature for 60-90 minutes. During the dyeing process, mechanical stirring is performed for 30 seconds every 15 minutes.

[0005] Preferably, in step S1, the solution A is a sodium hydroxide solution with a concentration of 2-3%.

[0006] Preferably, in step S1, the solution B is a hydrogen peroxide solution with a concentration of 5-8%.

[0007] Preferably, in the step S2, the citric acid is used to adjust the pH value of the tea polyphenol dyeing solution to 4.5-5.5.

[0008] Preferably, in step S2, the tea leaves are 70-80% fermented black tea.

[0009] Preferably, in step S2, the preparation steps of the metal mordant are as follows: S21, the metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1; S22, the metal mordant is added in a step-by-step manner, first adding the potassium aluminum sulfate to react with the bamboo fiber product for 10 minutes, and then adding the ferrous sulfate to react with the bamboo fiber product.

[0010] Preferably, in the step S2, the mass ratio of the metal mordant to the tea polyphenol dyeing solution is 1:100-1:50. Preferably, in the step S3, the bath ratio of the bamboo fiber product and the tea polyphenol dyeing solution is 1:30-1:40.

[0011] Preferably, in the step S3, the following steps are also included: Color fixing treatment: After the dyeing treatment is completed, the bamboo fiber product is first washed with 40°C warm water for 10 minutes, and then the bamboo fiber product is immersed in a color fixing agent at 60°C for 20 minutes for color fixing. The mass ratio of the color fixing agent to the bamboo fiber product is 3:100-5:100. Finally, the bamboo fiber product is placed in an oven and dried for 45 minutes at a temperature of 100°C.

[0012] Preferably, the color fixing agent includes alum and ferrous sulfate, and the mass ratio of the alum to the ferrous sulfate is 7:3.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The application method of the tea polyphenol dyeing process of the present invention on bamboo fiber products comprises S1, pretreatment of bamboo fiber products, S2, preparation of tea polyphenol dyeing solution, and S3, dyeing treatment, wherein solution A is a 2-3% sodium hydroxide solution, and solution B is a 5-8% hydrogen peroxide solution; the bamboo fiber products are subjected to alkali treatment with the sodium hydroxide solution to dissolve hemicellulose and lignin in the bamboo fiber, increase the fiber porosity, thereby improving the subsequent dye solution permeability and reducing the phenomenon of uneven dyeing; the bamboo fiber products are subjected to bleaching treatment with the hydrogen peroxide solution to oxidatively degrade residual pigments and impurities in the bamboo fiber products.

[0014] 2. The application method of the tea polyphenol dyeing process of the present invention on bamboo fiber products uses citric acid to adjust the pH value of the tea polyphenol dyeing solution to 4.5-5.5. Adjusting the pH value to 4.5-5.5 can optimize the combination environment of the tea polyphenol dyeing solution and the bamboo fiber products and reduce damage to the bamboo fiber products.

[0015] 3. The application method of the tea polyphenol dyeing process of the present invention on bamboo fiber products is that the tea is 70-80% fermented black tea. The selection of 70-80% fermented black tea can balance the content of tea polyphenols and tea pigments, and obtain good color fastness and antibacterial properties.

[0016] 4. The present invention relates to a method for applying a tea polyphenol dyeing process to bamboo fiber products. The metal mordant is prepared as follows: potassium aluminum sulfate and ferrous sulfate are mixed in a mass ratio of 3:1 to form the metal mordant; the metal mordant is added in a stepwise manner, with potassium aluminum sulfate added first and reacting for 10 minutes before adding the ferrous sulfate. The mass ratio of the metal mordant to the tea polyphenol dyeing solution is 1:100-1:50. Through chelation between metal ions and tea polyphenols, the bamboo fiber products dyed with the tea polyphenol dyeing solution exhibit a richer color and less discoloration.

[0017] 5. The tea polyphenol dyeing process of the present invention is applied to bamboo fiber products, wherein the bath ratio of the bamboo fiber product to the tea polyphenol dyeing solution is 1:30-1:40. This high bath ratio prolongs the contact time between the dye and the fiber, effectively increasing the dye uptake of the tea polyphenol dyeing solution and effectively solving the technical problem of natural dye uptake.

[0018] 6. The present invention's tea polyphenol dyeing process is applied to bamboo fiber products, including a color fixing treatment: After the dyeing treatment is completed, the bamboo fiber product is first washed with 40°C warm water for 10 minutes. The bamboo fiber product is then immersed in a color fixing agent at 60°C for 20 minutes to fix the color. The mass ratio of the color fixing agent to the bamboo fiber product is 3:100-5:100. Finally, the bamboo fiber product is dried in an oven at 100°C for 45 minutes. The color fixing agent comprises alum and ferrous sulfate in a mass ratio of 7:3. This color fixing treatment effectively improves the color fastness of the bamboo fiber product to washing. The alum chelates with the tea polyphenols and the bamboo fiber product, enhancing color fastness. Ferrous sulfate assists in color development. The color fixing agent is first adsorbed on the surface of the bamboo fiber product to form a molecular layer, activating the chemical cross-linking reaction between the color fixing agent, the dye, and the bamboo fiber, improving color fastness, promoting the chelation of metal ions with the fiber, and enhancing color stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 The figure is a schematic diagram of the steps of the method for applying the tea polyphenol dyeing process of the present invention to bamboo fiber products. DETAILED DESCRIPTION

[0021] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and should not be understood as limiting the present application.

[0022] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the described features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0023] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "installed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0024] In the description of this application, it should be understood that the terms "upper", "lower", "side", "front", "rear", etc. indicate orientations or positional relationships based on the installation, and are only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on this application.

[0025] In the description of this application, it should be noted that the term "and / or" is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0026] It should also be noted that, in the embodiments of the present application, the same figure mark represents the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0027] In addition, in this application, the technical features described in an open manner include closed technical solutions composed of the listed features, and also include open technical solutions containing the listed features.

[0028] To further understand the content, features and effects of the present invention, the following embodiments are given as examples and described in detail with reference to the accompanying drawings: The present application provides an application method of a tea polyphenol dyeing process on bamboo fiber products, the application method comprising the following steps: S1, pre-treating bamboo fiber products: immersing the bamboo fiber products in solution A for 30-40 minutes, maintaining the temperature at 60-65°C, repeatedly rinsing the solution A with deionized water until the pH value reaches 6.6-7.6, immersing the rinsed bamboo fiber products in solution B for 40-50 minutes for bleaching, maintaining the temperature at 50-60°C, dehydrating after bleaching, and drying for 30 minutes after dehydration; preparing tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves with water for 30 minutes, The method comprises the following steps: maintaining a temperature of 95-100° C., boiling, filtering with a 200-mesh filter cloth to obtain a tea polyphenol dyeing liquid, adding a metal mordant to the tea polyphenol dyeing liquid, adjusting the pH value of the tea polyphenol dyeing liquid with citric acid, and placing the pretreated bamboo fiber product and the tea polyphenol dyeing liquid in a dyeing machine, controlling the initial temperature at 50° C., uniformly heating the mixture to a target temperature of 85-90° C. at a rate of 1.5° C. / min, maintaining the mixture at the target temperature for 60-90 minutes, and mechanically stirring the mixture for 30 seconds every 15 minutes during the dyeing process. Color fixing treatment: After the dyeing treatment is completed, the bamboo fiber product is first washed with 40°C warm water for 10 minutes, and then the bamboo fiber product is immersed in a color fixing agent at 60°C for 20 minutes for color fixing. The mass ratio of the color fixing agent to the bamboo fiber product is 3:100-5:100. Finally, the bamboo fiber product is placed in an oven for drying for 45 minutes, and the temperature is maintained at 100°C. This scheme pioneered the application of tea polyphenol dyeing technology to bamboo fiber products, effectively expanding the diversity of tea polyphenol dyeing technology and providing a theoretical basis for the artistic creation of bamboo fiber products.

[0029] In order to better understand the application method of the tea polyphenol dyeing process on bamboo fiber products in this application, the application method is further explained below: See Figure 1 The method for applying the tea polyphenol dyeing process to bamboo fiber products in one embodiment comprises the following steps: S1. Pretreatment of bamboo fiber products: soak the bamboo fiber products in solution A for 30-40 minutes, maintain the temperature at 60-65°C, rinse repeatedly with deionized water to a pH value of 6.6-7.6, immerse the rinsed bamboo fiber products in solution B for 40-50 minutes for bleaching, maintain the temperature at 50-60°C, dehydrate after bleaching, and dry for 30 minutes after dehydration; solution A is a sodium hydroxide solution with a concentration of 2-3%; solution B is a hydrogen peroxide solution with a concentration of 5-8%; it can be understood that the bamboo fiber products are alkaline-treated with sodium hydroxide solution to dissolve the hemicellulose and lignin in the bamboo fiber products, increase the fiber porosity, improve the permeability of the subsequent dye solution, and reduce the phenomenon of uneven dyeing; the bamboo fiber products are bleached with hydrogen peroxide solution to oxidize and degrade residual pigments and impurities, effectively improving the whiteness of the bamboo fiber products.

[0030] S2. Preparation of tea polyphenol dyeing solution: tea leaves are selected as raw material, and the tea leaves and water are boiled for 30 minutes, maintaining the temperature at 95-100°C. After boiling, the tea polyphenol dyeing solution is filtered through a 200-mesh filter cloth to obtain the tea polyphenol dyeing solution, and a metal mordant is added to the tea polyphenol dyeing solution. The pH value of the tea polyphenol dyeing solution is adjusted with citric acid, and the mass ratio of tea leaves to water is 1:15-1:20. It can be understood that by adding the metal mordant, the metal ions are chelated with the tea polyphenols, making the subsequent dyeing fuller, effectively reducing color change, and improving color light stability. By adjusting the pH value of the tea polyphenol dyeing solution with citric acid, the binding environment of the dyeing solution and the bamboo fiber products can be optimized, the binding amount of tea polyphenols can be increased, and fiber damage can be reduced.

[0031] S3. Dyeing treatment: The pretreated bamboo fiber products and the tea polyphenol dyeing solution are placed in a dyeing machine with the initial temperature controlled at 50°C. The temperature is uniformly increased at a rate of 1.5°C / min to a target temperature of 85-90°C. The products are kept at the target temperature for dyeing for 60-90 minutes, and mechanically stirred for 30 seconds every 15 minutes during the dyeing process. It can be understood that the gradient heating method of uniformly increasing the temperature to a target temperature of 85-90°C at a rate of 1.5°C / min can effectively control the dyeing rate of the tea polyphenol dyeing solution, avoid color spots caused by instantaneous dyeing, and effectively improve the dyeing levelness. Mechanically stirring for 30 seconds every 15 minutes during the dyeing process can effectively improve the utilization rate of the tea polyphenol dyeing solution.

[0032] S4: Color fixing treatment: After the dyeing treatment is completed, the bamboo fiber products are first washed with 40°C warm water for 10 minutes, and then the bamboo fiber products are immersed in a color fixing agent at 60°C for 20 minutes for color fixing. The mass ratio of the color fixing agent to the bamboo fiber products is 3:100-5:100. Finally, the bamboo fiber products are placed in an oven for drying for 45 minutes at a temperature of 100°C. It can be understood that the color fixing agent is used to improve the color fastness of the dyeing solution, and drying is used to remove moisture from the bamboo fiber products.

[0033] In one embodiment, citric acid is used to adjust the pH value of the tea polyphenol dyeing solution to 4.5-5.5. It can be understood that by adjusting the tea polyphenol dyeing solution to a weak acidity by citric acid, the binding environment between the dyeing solution and the bamboo fiber product can be optimized, the binding amount of tea polyphenols can be increased, and fiber damage can be reduced. When the acidity is too strong, it will damage the bamboo fiber product and ultimately affect the quality of the bamboo fiber.

[0034] In one embodiment, the tea is 70-80% fermented black tea. It is understood that using black tea with a fermentation degree of 70-80% results in a 20-30% retention of tea polyphenols, providing sufficient free phenolic hydroxyl groups to form hydrogen bonds with the hydroxyl groups of bamboo fiber, enhancing the binding force. The tea pigment production is retained at 50-60%, resulting in a stable color tone and maintaining a uniform color.

[0035] In one embodiment, the metal mordant is prepared as follows: S21. The metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1. The aluminum ions in the potassium aluminum sulfate form a stable complex with the phenolic hydroxyl groups of the tea polyphenols, which can preferentially occupy the active sites on the fiber surface, thereby improving the uniformity of dye adsorption and color fastness. The iron ions in the ferrous sulfate form a dark complex with the tea pigments, thereby increasing the color depth. Excessive potassium aluminum sulfate may result in too light a dye, while excessive ferrous sulfate may cause bamboo fiber products to become brittle and have a darker color. S22. The metal mordant is added in a step-by-step manner, wherein potassium aluminum sulfate is first added to react with the bamboo fiber product for 10 minutes, and then ferrous sulfate is added to react with the bamboo fiber product; the aluminum ions in the potassium aluminum sulfate preferentially combine with the carboxyl and hydroxyl groups on the fiber surface to form uniform active sites, thereby avoiding color spots caused by subsequent local oversaturation of iron ions in the ferrous sulfate.

[0036] In one embodiment, the mass ratio of the metal mordant to the tea polyphenol dyeing solution is 1:100-1:50. It can be understood that too low a concentration cannot guarantee the dye uptake and results in poor color fastness, while too high a concentration may damage the fibers of the bamboo fiber product.

[0037] In one embodiment, the bath ratio of the bamboo fiber product to the tea polyphenol dyeing solution is 1:30-1:40. It can be understood that a high bath ratio can prolong the contact time between the dye and the fiber, effectively improve the dye uptake of the tea polyphenol dyeing solution, and effectively solve the technical problem of the color uptake of natural dyes.

[0038] Some specific examples are listed below. It should be noted that the following examples do not exhaust all possible situations, and the materials used in the following examples can be obtained from commercial channels unless otherwise specified. Example 1:

[0039] S1. Pretreatment of bamboo fiber products: Immerse the bamboo fiber products in solution A for 30 minutes, maintaining the temperature at 65°C. After immersion, rinse repeatedly with deionized water until the pH value reaches 7.0. Immerse the rinsed bamboo fiber products in solution B for 40 minutes for bleaching treatment, maintaining the temperature at 60°C. After bleaching, dehydrate and dry for 30 minutes. Solution A is a 2% sodium hydroxide solution; solution B is a 6% hydrogen peroxide solution. S2. Preparation of tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves and water for 30 minutes, maintaining the temperature at 98° C., filtering through a 200-mesh filter cloth after boiling to obtain a tea polyphenol dyeing solution, adding a metal mordant to the tea polyphenol dyeing solution, wherein the metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1, and adding the metal mordant in a stepwise manner, first adding potassium aluminum sulfate and reacting for 10 minutes before adding ferrous sulfate, adjusting the pH value of the tea polyphenol dyeing solution to 5.0 with citric acid, and the mass ratio of tea leaves to water is 1:15-1:20; the tea leaves are fermented black tea with a fermentation degree of 75%; S3, dyeing treatment: the pretreated bamboo fiber product and the tea polyphenol dyeing solution are placed in a dyeing machine, the initial temperature is controlled at 50 ° C, and the temperature is uniformly increased at a rate of 1.5 ° C / min to the target temperature of 85 ° C, and dyeing is carried out at the target temperature for 60 minutes. During the dyeing process, mechanical stirring is carried out for 30 seconds every 15 minutes. The bath ratio of the bamboo fiber product and the tea polyphenol dyeing solution is 1:35; S4: Color fixing treatment: After the dyeing treatment is completed, the bamboo fiber products are first washed with 40℃ warm water for 10 minutes, and then the bamboo fiber products are immersed in a color fixing agent at 60℃ for 20 minutes for color fixing. The mass ratio of the color fixing agent to the bamboo fiber products is 4:100. Finally, the bamboo fiber products are placed in an oven for drying for 45 minutes, and the temperature is maintained at 100℃. The color fixing agent includes alum and ferrous sulfate, and the mass ratio of alum to ferrous sulfate is 7:3. Example 2:

[0040] S1. Pretreatment of bamboo fiber products: Immerse the bamboo fiber products in solution A for 35 minutes, maintaining the temperature at 63°C. After immersion, rinse repeatedly with deionized water until the pH value reaches 6.8. Immerse the rinsed bamboo fiber products in solution B for 45 minutes for bleaching, maintaining the temperature at 55°C. Dehydrate the products after bleaching, and then dry them for 30 minutes. Solution A is a 2.5% sodium hydroxide solution; solution B is a 7% hydrogen peroxide solution. The metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1. The metal mordant is added stepwise, with potassium aluminum sulfate added first and reacting for 10 minutes before adding ferrous sulfate. S2. Preparation of tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves with water for 30 minutes, maintaining the temperature at 95° C., filtering through a 200-mesh filter cloth after boiling to obtain a tea polyphenol dyeing solution, adding a metal mordant to the tea polyphenol dyeing solution, adjusting the pH value of the tea polyphenol dyeing solution with citric acid to 4.5, and the mass ratio of tea leaves to water is 1:15-1:20; the tea leaves are 70% fermented black tea; S3. Dyeing treatment: Place the pretreated bamboo fiber products and tea polyphenol dyeing solution in a dyeing machine, control the initial temperature at 50°C, and uniformly heat to the target temperature of 88°C at a rate of 1.5°C / min. Dye at the target temperature for 70 minutes, mechanically stir for 30 seconds every 15 minutes during the dyeing process, and the bath ratio of bamboo fiber products to tea polyphenol dyeing solution is 1:30.

[0041] S4: Color fixing treatment: After the dyeing treatment is completed, the bamboo fiber products are first washed with 40°C warm water for 10 minutes, and then the bamboo fiber products are immersed in a color fixing agent at 60°C for 20 minutes for color fixing. The mass ratio of the color fixing agent to the bamboo fiber products is 3:100. Finally, the bamboo fiber products are placed in an oven for drying for 45 minutes, and the temperature is maintained at 100°C. The color fixing agent includes alum and ferrous sulfate, and the mass ratio of alum to ferrous sulfate is 7:3. Example 3:

[0042] S1. Pretreatment of bamboo fiber products: Immerse the bamboo fiber products in solution A for 30 minutes, maintaining the temperature at 60°C. After immersion, rinse repeatedly with deionized water until the pH value reaches 6.6. Immerse the rinsed bamboo fiber products in solution B for 40 minutes for bleaching treatment, maintaining the temperature at 50°C. After bleaching, dehydrate and dry for 30 minutes. Solution A is a sodium hydroxide solution with a concentration of 2-3%; Solution B is a hydrogen peroxide solution with a concentration of 5-8%. S2. Preparation of tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves and water for 30 minutes, maintaining the temperature at 95° C., filtering through a 200-mesh filter cloth after boiling to obtain a tea polyphenol dyeing solution, adding a metal mordant to the tea polyphenol dyeing solution, wherein the metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1, and adding the metal mordant in a step-by-step manner, first adding potassium aluminum sulfate and reacting for 10 minutes before adding ferrous sulfate; adjusting the pH value of the tea polyphenol dyeing solution with citric acid to 4.5, and the mass ratio of tea leaves to water is 1:15-1:20; the tea leaves are 70% fermented black tea; S3. Dyeing treatment: Place the pretreated bamboo fiber products and tea polyphenol dyeing solution in a dyeing machine, control the initial temperature at 50°C, and uniformly heat at a rate of 1.5°C / min to the target temperature of 85-90°C. Dye at the target temperature for 60 minutes, mechanically stir for 30 seconds every 15 minutes during the dyeing process, and the bath ratio of bamboo fiber products to tea polyphenol dyeing solution is 1:30.

[0043] S4: Fixation treatment: After the dyeing treatment is completed, the bamboo fiber products are first washed with 40°C warm water for 10 minutes, and then the bamboo fiber products are immersed in a fixing agent at 60°C for 20 minutes. The mass ratio of the fixing agent to the bamboo fiber products is 3:100. Finally, the bamboo fiber products are placed in an oven for drying for 45 minutes at 100°C. The fixing agent includes alum and ferrous sulfate, and the mass ratio of alum to ferrous sulfate is 7:3. Example 4:

[0044] S1. Pretreatment of bamboo fiber products: Immerse the bamboo fiber products in solution A for 40 minutes, maintaining the temperature at 65°C. After immersion, rinse repeatedly with deionized water until the pH value reaches 7.6. Immerse the rinsed bamboo fiber products in solution B for 50 minutes for bleaching, maintaining the temperature at 60°C. After bleaching, dehydrate and dry for 30 minutes. Solution A is a 3% sodium hydroxide solution; solution B is an 8% hydrogen peroxide solution. S2. Preparation of tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves and water for 30 minutes, maintaining the temperature at 100° C., filtering through a 200-mesh filter cloth after boiling to obtain a tea polyphenol dyeing solution, adding a metal mordant to the tea polyphenol dyeing solution, wherein the metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1, and adding the metal mordant in a step-by-step manner, first adding potassium aluminum sulfate and reacting for 10 minutes before adding ferrous sulfate; adjusting the pH value of the tea polyphenol dyeing solution with citric acid to 5.5, and the mass ratio of tea leaves to water is 1:20; the tea leaves are 80% fermented black tea; S3, dyeing treatment: the pretreated bamboo fiber product and the tea polyphenol dyeing solution are placed in a dyeing machine, the initial temperature is controlled at 50 ° C, and the temperature is uniformly increased at a rate of 1.5 ° C / min to the target temperature of 90 ° C, and dyeing is carried out at the target temperature for 90 minutes. During the dyeing process, mechanical stirring is performed for 30 seconds every 15 minutes. The bath ratio of the bamboo fiber product and the tea polyphenol dyeing solution is 1:40; S4: Color fixing treatment: After the dyeing treatment is completed, the bamboo fiber products are first washed with 40°C warm water for 10 minutes, and then the bamboo fiber products are immersed in a color fixing agent at 60°C for 20 minutes for color fixing. The mass ratio of the color fixing agent to the bamboo fiber products is 5:100. Finally, the bamboo fiber products are placed in an oven for drying for 45 minutes, and the temperature is maintained at 100°C. The color fixing agent includes alum and ferrous sulfate, and the mass ratio of alum to ferrous sulfate is 7:3.

[0045] Comparative Example 1: The treatment process of Comparative Example 1 is basically the same as that of Example 1, but in step S3 of Comparative Example 1, the temperature is directly increased from the initial temperature of 50° C. to 85-90° C. without using a gradient temperature increase method.

[0046] Comparative Example 2: The treatment process of Comparative Example 2 is basically the same as that of Example 1, but in step S2 of Comparative Example 2, black tea with a fermentation degree of 50% is selected.

[0047] Comparative Example 3: The treatment process of Comparative Example 3 is basically the same as that of Example 1, but in step S2 of Comparative Example 3, potassium aluminum sulfate and ferrous sulfate are simultaneously added to the tea polyphenol dyeing solution.

[0048] Comparative Example 4: The treatment process of Comparative Example 4 is basically the same as that of Example 1, but in step S3 of Comparative Example 4, the bath ratio of the bamboo fiber product and the tea polyphenol dyeing solution is 1:10.

[0049] Further analysis of the comparative examples shows that in comparative example 1, the step of gradient heating is omitted. Because the heating is too fast, the dyeing rate of the tea polyphenol dyeing solution cannot be controlled, resulting in instantaneous dyeing, and the dyed bamboo fiber products will have color flowers; while in embodiment 1, the dyeing rate can be effectively controlled by gradient heating, and the appearance of color flowers is effectively avoided; in comparative example 2, black tea with a fermentation degree of 50% is used, which retains a large amount of tea polyphenols, but lacks pigments, resulting in insufficient pigments in the dyed product, low dyeing rate, and low dyeing rate. The dyeing rate decreased by 20%, and the color fastness to washing reached level 3, while the color fastness to washing of Example 1 reached level 4-5; in Comparative Example 3, potassium aluminum sulfate and ferrous sulfate were simultaneously added to the tea polyphenol dyeing solution, which reduced the color fastness to washing of the product, and the color fastness to washing reached level 3-4, and the fiber strength retention rate reached 85%, while the color fastness to washing of Example 1 reached level 4-5, and the fiber strength retention rate exceeded 92%; in Comparative Example 4, the excessively low bath ratio caused the tea polyphenol dyeing solution to be quickly exhausted, the dyeing rate decreased by 10-15%, and the levelness was poor.

[0050] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A method for applying a tea polyphenol dyeing process to bamboo fiber products, characterized in that: The application method comprises the following steps: S1. Pretreatment of bamboo fiber products: Immerse the bamboo fiber products in solution A for 30-40 minutes, maintaining the temperature at 60-65°C. After immersion, rinse the bamboo fiber products repeatedly with deionized water until the pH value reaches 6.6-7.

6. Immerse the rinsed bamboo fiber products in solution B for 40-50 minutes for bleaching, maintaining the temperature at 50-60°C. After bleaching, dehydrate the products and dry them for 30 minutes. S2. Preparation of tea polyphenol dyeing solution: selecting tea leaves as raw materials, boiling the tea leaves with water for 30 minutes, maintaining the temperature at 95-100° C., filtering the tea leaves with a 200-mesh filter cloth after boiling to obtain a tea polyphenol dyeing solution, adding a metal mordant to the tea polyphenol dyeing solution, and adjusting the pH value of the tea polyphenol dyeing solution with citric acid, wherein the mass ratio of the tea leaves to the water is 1:15-1:20; S3, dyeing treatment: the pretreated bamboo fiber product and the tea polyphenol dyeing solution are placed in a dyeing machine, the initial temperature is controlled at 50 ° C, and the temperature is uniformly increased at a rate of 1.5 ° C / min to a target temperature of 85-90 ° C, and dyeing is carried out at the target temperature for 60-90 minutes. During the dyeing process, mechanical stirring is performed for 30 seconds every 15 minutes.

2. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 1, characterized in that: In the step S1, the solution A is a sodium hydroxide solution with a concentration of 2-3%.

3. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 2, characterized in that: In the step S1, the solution B is a hydrogen peroxide solution with a concentration of 5-8%.

4. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 3, characterized in that: In the step S2, the pH value of the tea polyphenol dyeing solution is adjusted to 4.5-5.5 using the citric acid.

5. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 4, characterized in that: In the step S2, the tea leaves are fermented black tea with a fermentation degree of 70-80%.

6. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 5, characterized in that: In the step S2, the preparation steps of the metal mordant are as follows: S21, the metal mordant is prepared by mixing potassium aluminum sulfate and ferrous sulfate in a mass ratio of 3:1; S22, the metal mordant is added in a step-by-step manner, first adding the potassium aluminum sulfate to react with the bamboo fiber product for 10 minutes, and then adding the ferrous sulfate to react with the bamboo fiber product.

7. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 6, characterized in that: In the step S2, the mass ratio of the metal mordant to the tea polyphenol dyeing solution is 1:100-1:

50.

8. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 7, characterized in that: In the step S3, the bath ratio of the bamboo fiber product to the tea polyphenol dyeing solution is 1:30-1:

40.

9. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to any one of claims 1 to 8, characterized in that: In the step S3, the following steps are also included: S4. Fixation treatment: After the dyeing treatment is completed, the bamboo fiber product is first washed with 40°C warm water for 10 minutes, and then the bamboo fiber product is immersed in a fixing agent at 60°C for 20 minutes for fixing. The mass ratio of the fixing agent to the bamboo fiber product is 3:100-5:

100. Finally, the bamboo fiber product is placed in an oven and dried for 45 minutes at a temperature of 100°C.

10. The method for applying the tea polyphenol dyeing process to bamboo fiber products according to claim 9, characterized in that: The color fixing agent includes alum and ferrous sulfate, and the mass ratio of the alum to the ferrous sulfate is 7:3.

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