Biological pigment microenvironment response type dissolving system and application thereof in printing and dyeing process

Abstract

The invention discloses a biological pigment microenvironment response type dissolution system and application thereof in a printing and dyeing process, the biological pigment microenvironment response type dissolution system comprises a biological pigment and a microenvironment response type polymer entrapment agent, and the biological pigment comprises monascorubin, monascus flavin and lycopene. The microenvironment response type polymer entrapment agent comprises one or more of a pH response type polyacrylic acid-polyethylene glycol copolymer and a temperature response type poly (N-isopropylacrylamide)-polyethylene glycol copolymer, the microenvironment response type polymer entrapment agent is synthesized through free radical polymerization or condensation reaction, the average particle size is smaller than 200 nm, the PDI is smaller than 0.3, and the microenvironment response type polymer entrapment agent is a polymer entrapment agent. The system is used in the dyeing or printing process of cellulosic fibers and serves as a controllable release type pigment source, a powdery product is obtained after the dissolving system is subjected to freeze drying, and the dissolving system has good storage stability and secondary dispersity, is suitable for large-scale application and is reasonable in system, low in cost and suitable for industrial production. The method has the advantages of being environmentally friendly and capable of improving dyeing uniformity, dye uptake and fastness under mild conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of textile printing and dyeing, and in particular to a bio-pigment microenvironment responsive dissolution system and application thereof in a printing and dyeing process. Background Art

[0002] Natural pigments such as monascus red, monascus yellow and lycopene have gradually become new raw materials for green dyeing and finishing of textiles due to their safe sources, biodegradability and soft colors. However, these pigments generally have problems such as poor aqueous solubility, low thermal stability and uncontrollable release during the printing and dyeing process, which seriously restrict their industrial application. In recent years, smart responsive materials (such as pH responsive, temperature responsive, and polymer encapsulation systems) have gradually been applied to drug delivery, food embedding and other fields, showing significant advantages in controlled release. Therefore, introducing responsive polymer materials into the natural pigment dissolution system is expected to construct a natural pigment dyeing and finishing system with high solubility, stability and smart responsiveness. Summary of the Invention

[0003] The purpose of the present invention is to provide a bio-pigment microenvironment-responsive dissolution system and its application in printing and dyeing technology, which has the advantages of being green and environmentally friendly and capable of improving dyeing uniformity, dye uptake and fastness under mild conditions.

[0004] The above technical objectives of the present invention are achieved through the following technical solutions:

[0005] A biopigment microenvironment-responsive dissolution system, comprising a biopigment and a microenvironment-responsive polymer encapsulation agent, wherein the biopigment comprises monascus red pigment, monascus yellow pigment, and lycopene, mixed in a mass ratio of 1:1:1, and the microenvironment-responsive polymer encapsulation agent comprises one or more of a pH-responsive polyacrylic acid-polyethylene glycol copolymer (PAA-g-PEG) and a temperature-responsive poly (N-isopropylacrylamide-polyethylene glycol) copolymer (PNIPAM-g-PEG);

[0006] The bio-pigment synthesis method comprises: dissolving monascus red pigment, monascus yellow pigment and lycopene in anhydrous ethanol by ultrasonication, adding the dissolved monascus red pigment, adding the dissolved monascus yellow pigment and lycopene into a buffer solution, adding the required polymer and stirring for 4 hours to form a composite system, removing the free pigment by dialysis, and finally freeze-drying to obtain a finished powder;

[0007] The synthesis method of the microenvironment-responsive polymer encapsulation agent package is as follows: a. Synthesis of pH-responsive polyacrylic acid-polyethylene glycol copolymer (PAA-g-PEG): Polyacrylic acid (PAA) and PEG (Mw 6000) were added to DMSO with DCC and DMAP (catalyst), stirred at 40°C for 12 hours, and the solvent was removed by rotary evaporation and freeze-dried to obtain a powder product; b. Synthesis of temperature-responsive poly (N-isopropylacrylamide-polyethylene glycol) copolymer (PNIPAM-g-PEG): Free radical polymerization of NIPAM and PEG was initiated in an acetone / water mixed solvent using AIBN (2%, mass ratio) as the initiator, the reaction temperature was 70°C, the reaction was carried out for 12 hours, the impurities were removed by dialysis, and the product was freeze-dried.

[0008] Preferably, the mass ratio of the microenvironment-responsive polymer carrier to the biological pigment is 2:1.

[0009] Preferably, the microenvironment-responsive polymer carrier is synthesized by free radical polymerization or condensation reaction, and has an average particle size of less than 200 nm and a PDI of less than 0.3.

[0010] Preferably, the system can be stably dissolved in an aqueous phase at a temperature below 40° C. and can achieve stable pigment release at a pH of 5.0-7.5.

[0011] A bio-pigment microenvironment-responsive dissolution system is used in a printing and dyeing process. The system is used in the dyeing or printing process of cellulose fibers as a controllable-release pigment source.

[0012] Preferably, the cellulose fiber is one of cotton, viscose, Tencel, Modal or bamboo fiber.

[0013] Preferably, the dyeing time is 30-60 minutes, and natural tannic acid or tea polyphenols are used as a fixing agent after dyeing to improve color fastness.

[0014] Preferably, the dissolving system is added to the heat-sensitive printing paste, and the pigment is released under steam conditions to form a pattern with clear pattern boundaries, a unit transition area of ​​less than 200 μm, and a resolution of ≥300 dpi.

[0015] Preferably, the dissolved system is freeze-dried to obtain a powdered product, which has good storage stability and secondary dispersibility and is suitable for large-scale application.

[0016] The beneficial effects of the present invention are as follows: the present invention provides an aqueous dissolution system synergistically constructed using microenvironment-responsive polymers (including pH-responsive and temperature-responsive copolymers) and pigments, which realizes efficient dispersion and controlled dyeing release of monascus red pigment, monascus yellow pigment and lycopene, improves dyeing uniformity, dyeing rate and fastness under mild conditions, significantly reduces energy and auxiliary agent consumption, and adapts to green printing and dyeing needs. The system uses polymer materials such as PAA-g-PEG and PNIPAM-g-PEG as responsive matrices, and uses polymer microstructure changes and non-covalent binding mechanisms to enhance pigment dissolution and release behavior, thereby obtaining a powdered dissolution system that can be stably stored and released as needed during the dyeing process. DETAILED DESCRIPTION

[0017] The following description is only a preferred embodiment of the present invention, and the protection scope is not limited to this embodiment. All technical solutions under the concept of the present invention should fall within the protection scope of the present invention.

[0018] A biopigment microenvironment-responsive dissolution system and its application in a printing and dyeing process include a biopigment and a microenvironment-responsive polymer encapsulation agent. The biopigment includes monascus red pigment, monascus yellow pigment, and lycopene, which are mixed in a mass ratio of 1:1:1. The biopigment is synthesized by ultrasonically dissolving the monascus red pigment, monascus yellow pigment, and lycopene in anhydrous ethanol, adding the dissolved monascus red pigment, and adding the dissolved monascus yellow pigment to a buffer solution, adding the required polymer, and stirring for 4 hours to form a composite system, removing free pigments by dialysis, and finally freeze-drying to obtain a finished powder.

[0019] The microenvironment-responsive polymer encapsulation agent includes one or more of a pH-responsive polyacrylic acid-polyethylene glycol copolymer (PAA-g-PEG) and a temperature-responsive poly (N-isopropylacrylamide-polyethylene glycol) copolymer (PNIPAM-g-PEG). The synthesis method of the microenvironment-responsive polymer encapsulation agent is as follows: a. Synthesis of pH-responsive poly (acrylic acid-polyethylene glycol) copolymer (PAA-g-PEG): Add DCC and DMAP (catalyst) to poly (acrylic acid) (PAA) and PEG (Mw 6000) in DMSO, stir at 40°C for 12 hours, remove the solvent by rotary evaporation, and then freeze-dry to obtain a powder product; b. Synthesis of temperature-responsive poly (N-isopropylacrylamide-polyethylene glycol) copolymer (PNIPAM-g-PEG): Initiate free radical polymerization of NIPAM and PEG in an acetone / water mixed solvent using AIBN (2%, mass ratio) as the initiator, react at 70°C for 12 hours, dialyze to remove impurities, and then freeze-dry.

[0020] The mass ratio of the microenvironment-responsive polymer encapsulant to the biological pigment is 2:1. The microenvironment-responsive polymer encapsulant is synthesized by free radical polymerization or condensation reaction, with an average particle size of less than 200 nm and a PDI of less than 0.3. The system can be stably dissolved in the aqueous phase below 40°C and achieve stable pigment release at pH 5.0-7.5.

[0021] This system is used in the dyeing or printing process of cellulose fibers as a controlled-release pigment source, where the cellulose fibers are one of cotton, viscose, Tencel, modal or bamboo fibers, and the dyeing time is 30-60 minutes. After dyeing, natural tannic acid or tea polyphenols are used as a fixing agent to improve color fastness.

[0022] The dissolving system is added to the thermal printing paste, and the pigment is released under steam conditions to form a pattern with clear pattern boundaries, a unit transition area of ​​less than 200μm, and a resolution of ≥300dpi. The dissolving system is freeze-dried to obtain a powdered product with good storage stability and secondary dispersibility, and is suitable for large-scale application.

[0023] Example 1

[0024] pH responsive system for dyeing cotton

[0025] This example aims to verify the dyeing performance of the pH-responsive dissolution system constructed in the present invention on cotton cloth and its effect on improving the dyeing effect.

[0026] Material preparation: Prepare monascorubrin and monacin with a purity of ≥98%; prepare lycopene with a purity of ≥96%, prepare polyacrylic acid and PEG (Mw6000) for constructing a pH-responsive polyacrylic acid-polyethylene glycol copolymer. Other chemical reagents including DCC, DMAP, anhydrous DMSO, etc. are all of analytical grade. The cotton cloth is refined bleached pure cotton cloth.

[0027] Polymer synthesis: 5 g of polyacrylic acid and 2 g of PEG (Mw 6000) were added to a 250 mL three-necked flask and dissolved in 50 mL of DMSO. 0.5 g of DCC and 0.2 g of DMAP were added sequentially. The mixture was stirred at room temperature under nitrogen for 12 h. The reaction solution was rotary evaporated to remove DMSO, and the polymer was precipitated with ether and freeze-dried to obtain a light yellow solid. The obtained PAA-g-PEG had an average molecular weight of approximately 60 kDa. Analysis by dual-angle particle size analyzer and molecular weight analyzer showed a particle size distribution of 135 ± 10 nm and a PDI of 0.21.

[0028] Preparation of pigment mixture: 0.3 g of each of the three pigments mentioned above was dissolved in 10 mL of anhydrous ethanol and ultrasonically treated for 10 minutes (equipment used was a KQ-500DE ultrasonic cleaner with a power of 250 W). The solution was slowly added dropwise to 40 mL of PBS buffer (pH 7.0), and 0.6 g of synthesized PAA-g-PEG was quickly added. The mixture was magnetically stirred for 4 hours to form an emulsion. The emulsion was dialyzed for 24 hours using a MWCO 3,500 Da dialysis bag and freeze-dried to obtain a powdered composite system (pigment content was approximately 28 wt%).

[0029] Dye solution preparation and cotton cloth treatment: The pigment system powder was dissolved in 40 mL of distilled water to prepare a 2% (owf) concentration of dye solution, the pH was adjusted to 5.5, the cotton cloth was cut into 10 cm × 10 cm size, weighed 2.0 g, and dyed using an AhibaIR dyeing prototype, with a set temperature of 40 ° C, a bath ratio of 1:20, and a dyeing time of 45 minutes. After dyeing, the cotton cloth was taken out, rinsed three times, treated with 2% natural tannic acid solution for 10 minutes, and then dried.

[0030] Performance test: Using a Datacolor 650 spectrophotometer (D65 light source, 10° viewing angle), the K / S value was measured to be 11.2, ΔE = 1.8, and the wash fastness was tested according to GB / T 3921 standard, with a rating of 4. The dry rubbing fastness was level 4, and the wet rubbing fastness was level 3-4. The testing instrument was a Y571 rubbing fastness meter.

[0031] The results show that dyeing can be completed at 40°C using the pH-responsive pigment dissolving system of the present invention, and the dyeing depth and fastness meet industrial standards, and the system is suitable for green low-temperature printing and dyeing processes.

[0032] Example 2

[0033] Temperature responsive dyeing of viscose

[0034] This example verifies the low-temperature dyeing performance of the temperature-responsive polymer system of the present invention on viscose fibers and its heat-induced release ability.

[0035] Material preparation: Monascus red pigment, monascus yellow pigment, lycopene: the same as in Example 1, poly N-isopropylacrylamide (NIPAM, 99%), polyethylene glycol (PEG4000), AIBN initiator, acetone, deionized water, etc. are all analytically pure, viscose nonwoven fabric, its fiber diameter is 2.3 dtex, cloth weight is 120 g / m 2 .

[0036] Synthesis of PNIPAM-g-PEG: 1.0 g of NIPAM, 0.4 g of PEG4000, and 10 mg of AIBN were dissolved in 20 mL of acetone / water (volume ratio 3:2). The reaction was incubated in a 70°C water bath (temperature controlled by a magnetic stirrer) for 12 h. Unreacted monomers and small molecular impurities were removed using a dialysis bag (MWCO3,500 Da). The resulting polymer was lyophilized to obtain a temperature-responsive polymer with an approximately 82% yield. DSC thermal analysis (TAQ2000) showed a phase transition temperature (LCST) of 32.4°C.

[0037] Pigment encapsulation and composite system preparation: The pigment ratio and treatment method were the same as in Example 1. PNIPAM-g-PEG: pigment = 2:1 mass ratio was mixed, slowly stirred for 2 h to form a uniform composite solution, and freeze-dried into a micropowder with a particle size of 143 ± 8 nm, a zeta potential of -31 mV, and an encapsulation efficiency of approximately 67%.

[0038] Dye solution preparation and viscose dyeing: The composite powder was dissolved in preheated deionized water at a concentration of 2% (owf) to prepare the dye solution. The initial dyeing temperature was set at 35°C. The viscose fiber was cut into 10 cm × 10 cm specimens with a bath ratio of 1:25. After immersion for 25 minutes, the dye bath was suddenly cooled to 15°C to promote the phase transition of PNIPAM to release the entrapped pigment. The total dyeing time was 45 minutes. The dye was rinsed three times and post-treated with 1.5% (owf) natural tannic acid.

[0039] Test results: The dye uptake was measured using a Shimadzu UV-2600 spectrophotometer. The initial absorbance was 1.09, which was 0.14 after dyeing, resulting in a dye uptake of approximately 87%. Tested using a Datacolor 650 spectrophotometer, the results showed K / S = 10.5, ΔE = 2.1, wash fastness to level 4, dry rubbing fastness to level 3-4, and wet rubbing fastness to level 3.

[0040] The results show that the PNIPAM-g-PEG system can effectively respond to temperature changes, achieve heat-induced release of natural pigments, improve dyeing efficiency and uniformity, and is suitable for high-value-added low-temperature dyeing and finishing applications.

[0041] Example 3

[0042] Mixed response dyeing of Tencel

[0043] In this example, a dual-responsive system was constructed by combining pH-responsive and temperature-responsive polymers, and applied to the low-temperature dyeing of Lyocell fibers to verify its synergistic effect on improving dyeing stability and controlled release performance.

[0044] Material preparation: Monascus red pigment, Monascus yellow pigment, Lycopene: Same as Example 1, PAA-g-PEG and PNIPAM-g-PEG were synthesized and mixed in a mass ratio of 1:1. Tencel fiber cloth was mercerized and weighed 140 g / m 2 .

[0045] Preparation of pigment entrapment composite system: 0.2 g each of monascus red, monascus yellow, and lycopene were dissolved in 10 mL of anhydrous ethanol and ultrasonically dispersed. The mixture was added to 50 mL of PBS buffer (pH 7.0) containing 1.2 g of PAA-g-PEG and PNIPAM-g-PEG complex. The mixture was stirred and reacted for 5 hours to form a stable emulsion. After 24 hours of dialysis and freeze-drying, a reddish-brown powder was obtained with a particle size of 138±9 nm and an entrapment efficiency of approximately 64%.

[0046] Dye solution preparation and dyeing: The obtained powder was dissolved in preheated water at a concentration of 2.5% (owf), and the pH was adjusted to 6.0. The Tencel sample was cut into 10 cm × 10 cm pieces and weighed 2.2 g. The bath ratio was 1:25. The Datacolor Ahiba IR sample dyeing machine was used and the temperature was set to 40°C. The dyeing was carried out for 60 minutes. After dyeing, the sample was cooled and rinsed three times, and then post-treated with a 2% tea polyphenol solution.

[0047] Test results: K / S = 13.2, color difference ΔE = 1.5, indicating that the dyeing depth is high and uniform, the washing fastness is rated as level 4-5 according to GB / T3921, the dry rubbing fastness is level 4, and the wet rubbing fastness is level 3-4. The scanning electron microscope (SEM) image of the fiber surface shows that the pigment is evenly attached and there is no flocculation.

[0048] This example shows that the dual-response system has a synergistic enhancement effect, has excellent release regulation and dyeing performance on cellulose-based fibers, and is suitable for functional low-temperature dyeing and finishing processes.

[0049] Example 4

[0050] Dyeing bamboo fiber

[0051] This example verifies the applicability and experimental stability of the pH-responsive pigment dissolution system of the present invention on bamboo fiber fabrics.

[0052] Materials and equipment: Monascus red pigment, monascus yellow pigment, lycopene: the same as in Example 1, PAA-g-PEG polymer was synthesized by the method in Example 1, bamboo pulp fiber weight was 150g / m 2 , scouring and bleaching.

[0053] Preparation of the pigment composite system: The pigment and PAA-g-PEG polymer were mixed in a 1:2 mass ratio, dissolved in PBS buffer (pH 7.2), and magnetically stirred at room temperature for 4 hours to form an emulsion. The emulsion was dialyzed through a dialysis bag (MWCO 3,500Da) for 24 hours and freeze-dried to obtain a powder with an average particle size of 132 ± 12 nm and an entrapment efficiency of approximately 65%.

[0054] Dyeing process: Dye solution concentration: 2% (owf), pH adjusted to 6.0, temperature set to 40°C, using Datacolor AhibaIR sample dyeing machine, bath ratio 1:20, dyeing time is 45 minutes, after dyeing, rinse with deionized water 3 times, and use 2% tannic acid solution for fixing treatment for 10 minutes.

[0055] Performance and repeatability test: Using a Datacolor 650 spectrophotometer, the K / S value was 10.8, the ΔE was 1.9, and the color fastness: wash fastness level 4, dry rubbing level 4, wet rubbing level 3. The experiment was repeated for 3 batches, and the ΔE difference between each batch was <0.2, indicating that the system color value is stable and the operation repeatability is good.

[0056] The results show that the pH-responsive system is suitable for relatively hydrophilic plant fibers such as bamboo fiber, has excellent dyeing stability and adhesion under room temperature and low-carbon processes, and has potential for large-scale application.

[0057] Example 5

[0058] Printing Application

[0059] In this example, the pigment-responsive polymer composite system was applied to the thermal printing process of textiles to verify its effects in terms of pattern resolution, adhesion fastness, and color uniformity.

[0060] Material preparation: Pigment system: PAA-g-PEG and PNIPAM-g-PEG composite pigment powder prepared in Example 3, printing paste: water-based sodium polyacrylate paste (Shanghai Youchem), thickener: xanthan gum (0.5%), sample fabric: pure cotton fabric, specification: 140g / m 2 , pre-mercerization treatment, template: laser engraving fine hollow offset plate, resolution 600dpi, steaming equipment: XHS-15 high temperature steaming machine, the maximum temperature control is 105 ℃, fixing agent: tea polyphenols 2%, for spraying post-processing.

[0061] Preparation and operation process of printing paste: Take 3g of pigment polymer powder and add it to 47g of printing paste base slurry (mass fraction 6%), adjust the pH to 6.5, use a 300-mesh scraper to scrape the pattern template on a 10cm×10cm cloth sample, scrape twice, control the thickness to 50-60μm, place it in a constant temperature room for pre-drying (temperature 35℃, 30 minutes), then transfer it to the steaming equipment and treat it at 102℃ for 90 seconds to promote the phase change of PNIPAM to release the pigment, cool it after printing, use 2% tea polyphenols spray to fix the color, and dry it naturally.

[0062] Performance and pattern accuracy evaluation: The actual images were analyzed using ImageJ software. The fuzzy band at the pattern boundary was less than 180 μm, the pattern clarity was good, and the mean difference ΔE of the reflectance spectrum was 1.7-2.3, indicating good pigment color uniformity. Color fastness test (GB / T3921, GB / T3920): water fastness level 4, dry rubbing fastness level 4.

[0063] The results show that the thermally responsive printing paste prepared using the pigment-polymer system of the present invention can release pigments under low-temperature evaporation conditions to form high-resolution patterns, has good pattern clarity, color reproduction and fastness, and is suitable for the field of natural dye environmentally friendly fine printing.

[0064] Experimental test methods

[0065] Particle size distribution: Malvern Zetasizer Nano ZS, detect average particle size and PDI

[0066] UV absorption test: Shimadzu UV-2600, λmax = 470nm

[0067] Calculation of Encapsulation Efficiency: Dialysis Bag Method Comparison of Initial and Dialysate Concentrations

[0068] Color fastness standards: GB / T3921, GB / T3920

[0069] Printing resolution: edge transition value measured by image recognition method, unit: μm

[0070] Thermal response temperature: DSC curve determination of polymer transition point (PNIPAM about 32 ° C)

[0071] In summary, the bio-pigment microenvironment-responsive dissolution system proposed in the present invention introduces microenvironment response to regulate pigment dissolution and release, taking into account both stability and intelligent response. The system powder can be stored dryly and is easy to use. It is suitable for multiple process paths such as dyeing, printing, and spraying. It significantly improves the efficiency and uniformity of natural pigment dyeing, helps sustainable printing and dyeing practices, and achieves low-temperature, high-efficiency, and controllable dyeing and printing on a variety of cellulose substrates. It is suitable for large-scale industrial applications of natural dyes.

[0072] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A bio-pigment microenvironment responsive dissolution system, characterized in that: The invention comprises a biological pigment and a microenvironment-responsive polymer encapsulation agent, wherein the biological pigment comprises monascus red pigment, monascus yellow pigment and lycopene, which are mixed in a mass ratio of 1:1:1, and the microenvironment-responsive polymer encapsulation agent comprises one or more of pH-responsive polyacrylic acid-polyethylene glycol copolymer (PAA-g-PEG) and temperature-responsive poly N-isopropylacrylamide-polyethylene glycol copolymer (PNIPAM-g-PEG); The bio-pigment synthesis method comprises: dissolving monascus red pigment, monascus yellow pigment and lycopene in anhydrous ethanol by ultrasonication, adding the dissolved monascus red pigment, adding the dissolved monascus yellow pigment and lycopene into a buffer solution, adding the required polymer and stirring for 4 hours to form a composite system, removing the free pigment by dialysis, and finally freeze-drying to obtain a finished powder; The synthesis method of the microenvironment-responsive polymer encapsulation agent package is as follows: a. Synthesis of pH-responsive polyacrylic acid-polyethylene glycol copolymer (PAA-g-PEG): Polyacrylic acid (PAA) and PEG (Mw 6000) were added to DMSO with DCC and DMAP (catalyst), stirred at 40°C for 12 hours, and the solvent was removed by rotary evaporation and freeze-dried to obtain a powder product; b. Synthesis of temperature-responsive poly (N-isopropylacrylamide-polyethylene glycol) copolymer (PNIPAM-g-PEG): Free radical polymerization of NIPAM and PEG was initiated in an acetone / water mixed solvent using AIBN (2%, mass ratio) as the initiator, the reaction temperature was 70°C, the reaction was carried out for 12 hours, the impurities were removed by dialysis, and the product was freeze-dried.

2. A bio-pigment microenvironment responsive dissolution system according to claim 1, characterized in that: The mass ratio of the microenvironment-responsive polymer carrier to the biological pigment is 2:

1.

3. A bio-pigment microenvironment responsive dissolution system according to claim 1, characterized in that: The microenvironment-responsive polymer carrier is synthesized by free radical polymerization or condensation reaction, has an average particle size of less than 200 nm, and a PDI of less than 0.

3.

4. A bio-pigment microenvironment responsive dissolution system according to claim 1, characterized in that: The system can be stably dissolved in water at temperatures below 40°C and can achieve stable pigment release at pH 5.0-7.

5.

5. The use of a bio-pigment microenvironment responsive dissolution system in a printing and dyeing process according to claim 1, characterized in that: The system is used in the dyeing or printing process of cellulose fibers as a controlled-release pigment source.

6. The use of a bio-pigment microenvironment responsive dissolution system in a printing and dyeing process according to claim 5, characterized in that: The cellulose fiber is one of cotton, viscose, Tencel, Modal or bamboo fiber.

7. The use of a bio-pigment microenvironment responsive dissolution system in a printing and dyeing process according to claim 5, characterized in that: The dyeing time is 30-60 minutes. After dyeing, natural tannic acid or tea polyphenols are used as a fixing agent to improve color fastness.

8. The use of a bio-pigment microenvironment responsive dissolution system in a printing and dyeing process according to claim 1, characterized in that: The dissolving system is added to the thermal printing paste, and the pigment is released under steam conditions to form a pattern with clear pattern boundaries, a unit transition area of ​​less than 200μm, and a resolution of ≥300dpi.

9. The use of a bio-pigment microenvironment responsive dissolution system in a printing and dyeing process according to claim 1, characterized in that: The dissolved system is freeze-dried to obtain a powdered product with good storage stability and secondary dispersibility, and is suitable for large-scale application.