Multifunctional cloth dyeing method based on natural plant extract and product

Abstract

The invention relates to the technical field of textile dyeing, and discloses a multifunctional cloth dyeing method based on a natural plant extract and a product, and the multifunctional cloth dyeing method comprises the following steps: S1, extracting natural plants: extracting natural pigments and functional components from the natural plants; s2, preparation of dye liquor: preparing the dye liquor containing natural plant extracts; s3, dyeing treatment: immersing the cloth into the dye liquor, and realizing uniform dyeing of the cloth by controlling dyeing parameters; s4, fixation treatment: carrying out fixation treatment on the dyed cloth; s5, washing and drying: washing and drying the cloth subjected to color fixation. By using the natural plant extract as the dye, the pollution of the traditional chemical dye to the environment is avoided, and the dyeing process is eco-friendly and sustainable. Meanwhile, the natural extract is harmless to human bodies, reduces irritation of chemical residues to skin, is especially suitable for production of products with high safety requirements such as infant clothing and medical textiles, and has high health safety.

Description

Technical Field

[0001] The invention relates to the technical field of textile dyeing, in particular to a multifunctional cloth dyeing method and product based on natural plant extracts. Background Art

[0002] Chemical fabric dyeing refers to the process of coloring textiles using synthetic chemical dyes. This process is widely used in the modern textile industry because chemical dyes have the advantages of bright colors, rich varieties, fast dyeing speed and good fastness. Chemical dyes are mainly divided into acid dyes, basic dyes, direct dyes, disperse dyes and reactive dyes, etc. There are different dyeing methods for different fiber materials. After proper process treatment, chemical dye-dyed fabrics usually have good washing resistance, friction resistance and light fastness. Chemical dyes can be dyed quickly in large quantities through modern equipment, and the dyeing process is easy to control and suitable for large-scale production. In addition, the production and application costs of chemical dyes are relatively low, which is suitable for economical and efficient large-scale industrial production.

[0003] However, in the field of traditional textile dyeing, chemical dyes are widely used because of their low cost, bright colors and mature technology. However, the negative impact of chemical dyes on the environment and human health has gradually attracted people's attention. Chemical dyes usually release a large amount of toxic and harmful wastewater and waste gas during production and use, causing serious pollution to water bodies and the atmosphere. At the same time, some components in chemical dyes may remain on textiles, and long-term contact with human skin can cause allergies, irritation reactions, and even carcinogenesis, especially posing a threat to the health of infants and young children and people with sensitive constitutions. With the improvement of environmental awareness and the increase in consumer demand for green and healthy textiles, the development of environmentally friendly, sustainable and safe natural dyes has become an important research direction in the textile industry. Natural plant dyes have become a potential alternative to chemical dyes because of their wide sources, renewable, non-toxic and easy to degrade. However, the promotion of natural dyes faces some technical challenges, such as insufficient color fastness and unstable dyeing effects. Therefore, how to control the color fastness of natural plant dyes through scientific processes and give textiles more functionality has become a key research topic in current green textile dyeing technology. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a multifunctional cloth dyeing method and product based on natural plant extracts, which solves the problem of serious environmental pollution caused by the use of chemical dyes.

[0005] To achieve the above objectives, the present invention is implemented by the following technical scheme: a multifunctional cloth dyeing method based on natural plant extracts, comprising the following steps:

[0006] S1. Extraction of natural plants: Extracting natural pigments and functional ingredients from natural plants;

[0007] S2. Preparation of dye solution: preparing dye solution containing natural plant extracts;

[0008] S3, dyeing treatment: immersing the fabric in the dye solution, and achieving uniform dyeing of the fabric by controlling dyeing parameters;

[0009] S4, color fixing treatment: color fixing treatment is performed on the dyed fabric;

[0010] S5. Washing and drying: Wash and dry the fabric after color fixation.

[0011] Preferably, in step S1, the natural plants include but are not limited to madder, indigo, aloe, pomegranate peel, gardenia and mulberry leaf.

[0012] Preferably, in step S1, the extraction comprises the following steps:

[0013] a. Pre-treatment of natural plants: cleaning, drying and crushing of natural plants;

[0014] b. Selection of extraction solvent: water and ethanol are selected for extraction, and the ratio of plant to solvent is 1:10 to 1:20;

[0015] c. Extraction process: extract natural pigments and functional ingredients through heating reflux extraction and ultrasonic assisted extraction;

[0016] d. Filtration and concentration: Filter the extract and concentrate it by rotary evaporation or vacuum evaporation equipment;

[0017] e. Storage and stabilization: The extract should be treated with antiseptic and antioxidant treatment and stored in a light-proof and low-temperature environment.

[0018] Preferably, in step S2, the dye solution preparation comprises the following steps:

[0019] a. Determination of extract concentration: Dilute the plant extract to a concentration range of 1% to 10% according to the desired staining depth;

[0020] b. pH adjustment: adjust the pH value of the dye solution to between 4 and 6 by adding citric acid or acetic acid;

[0021] c. Addition of functional additives: according to the functional requirements of the fabric, add natural sunscreen, antibacterial agent or mosquito repellent, the addition amount is 1% to 5% of the dye liquid volume;

[0022] d. Heating and heat preservation: Heat the dye solution to 40℃~80℃ and maintain a constant temperature;

[0023] e. Dye liquid filtration: Use filter cloth and filter paper to filter the dye liquid to remove impurities and ensure that the dye liquid is clear and uniform.

[0024] Preferably, the step S3 further comprises the following steps:

[0025] a. Fabric pretreatment: clean and moisten the fabric to ensure that the surface is clean and suitable for dyeing;

[0026] b. Dye soaking: completely immerse the fabric in the dye to ensure even contact with the dye;

[0027] c. Temperature and time control: Heat the dye solution to 40℃~80℃ through the heating device and keep the temperature constant. The dyeing time is 30min~120min;

[0028] d. Stirring and circulation: Use a stirrer or circulating dyeing equipment to evenly distribute the dye on the surface of the fabric.

[0029] Preferably, in the step S4, the color fixing treatment comprises the following steps:

[0030] a. Selection of fixing agent: any one of acetic acid, alum and zinc acetate is selected as the fixing agent, and the concentration of the fixing agent is 1% to 5%;

[0031] b. Control of color fixing temperature and time: the color fixing temperature is controlled between 40℃ and 60℃, and the color fixing time is 15min to 30min;

[0032] c. Stirring of the fixing solution: During the fixing process, mechanical stirring or circulation system is used to ensure that the fixing solution is evenly distributed.

[0033] Preferably, in step S5, warm water is used for washing, and a drying machine with a set temperature of less than 60° C. is used for drying.

[0034] The multifunctional fabric based on natural plant extracts has natural color and at least one functionality, including but not limited to antibacterial, sun-proof and mosquito-proof functions.

[0035] The present invention provides a multifunctional cloth dyeing method and product based on natural plant extracts, which has the following beneficial effects:

[0036] 1. The present invention uses natural plant extracts as dyes, thus avoiding the pollution of the environment by traditional chemical dyes, and the dyeing process is eco-friendly and sustainable. At the same time, natural extracts are harmless to the human body, reducing the irritation of chemical residues to the skin, and are particularly suitable for the production of infant clothing, medical textiles and other products with high safety requirements, and have high health and safety.

[0037] 2. The functional ingredients in the natural plant extracts of the present invention make the fabric have multiple functions such as antibacterial, sunscreen, mosquito repellent, etc. Through scientific control of dyeing temperature, time and color fixation process, the fabric is ensured to have good color fastness, strong resistance to washing, friction and light, and an excellent balance is achieved between functionality and color fastness. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a flow chart of the steps of the present invention. DETAILED DESCRIPTION

[0039] The following will be combined with the drawings in the specification of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] Embodiment 1:

[0041] Please see attached Figure 1 The embodiment of the present invention provides a multifunctional cloth dyeing method based on natural plant extracts, comprising the following steps:

[0042] S1. Extraction of natural plants: Extracting natural pigments and functional ingredients from natural plants;

[0043] S2. Preparation of dye solution: preparing dye solution containing natural plant extracts;

[0044] S3, dyeing treatment: immersing the fabric in dye solution and achieving uniform dyeing of the fabric by controlling dyeing parameters;

[0045] S4, color fixing treatment: color fixing treatment is performed on the dyed fabric;

[0046] S5, washing and drying: washing and drying the fabric after color fixation;

[0047] In step S1, the natural plants include but are not limited to madder, indigo, aloe, pomegranate peel, gardenia and mulberry leaf. In step S1, the extraction includes the following steps:

[0048] a. Pre-treatment of natural plants: cleaning, drying and crushing of natural plants;

[0049] b. Selection of extraction solvent: water and ethanol are selected for extraction, and the ratio of plant to solvent is 1:10 to 1:20;

[0050] c. Extraction process: extract natural pigments and functional ingredients through heating reflux extraction and ultrasonic assisted extraction;

[0051] d. Filtration and concentration: Filter the extract and concentrate it by rotary evaporation or vacuum evaporation equipment;

[0052] e. Storage and stabilization: The extract is treated with antiseptic and antioxidant treatment and stored in a dark and low temperature environment;

[0053] In step S2, the dye solution preparation includes the following steps:

[0054] a. Determination of extract concentration: Dilute the plant extract to a concentration range of 1% to 10% according to the desired staining depth;

[0055] b. pH adjustment: adjust the pH value of the dye solution to between 4 and 6 by adding citric acid or acetic acid;

[0056] c. Addition of functional additives: according to the functional requirements of the fabric, add natural sunscreen, antibacterial agent or mosquito repellent, the addition amount is 1% to 5% of the dye liquid volume;

[0057] d. Heating and heat preservation: Heat the dye solution to 40℃~80℃ and maintain a constant temperature;

[0058] e. Dye liquid filtration: Use filter cloth and filter paper to filter the dye liquid to remove impurities and ensure that the dye liquid is clear and uniform;

[0059] The step S3 further includes the following steps:

[0060] a. Fabric pretreatment: clean and moisten the fabric to ensure that the surface is clean and suitable for dyeing;

[0061] b. Dye soaking: completely immerse the fabric in the dye to ensure even contact with the dye;

[0062] c. Temperature and time control: Heat the dye solution to 40℃~80℃ through the heating device and keep the temperature constant. The dyeing time is 30min~120min;

[0063] d. Stirring and circulation: Use a stirrer or circulating dyeing equipment to evenly distribute the dye on the surface of the fabric;

[0064] In step S4, the color fixing process includes the following steps:

[0065] a. Selection of fixing agent: any one of acetic acid, alum and zinc acetate is selected as the fixing agent, and the concentration of the fixing agent is 1% to 5%;

[0066] b. Control of color fixing temperature and time: the color fixing temperature is controlled between 40℃ and 60℃, and the color fixing time is 15min to 30min;

[0067] c. Stirring of the fixing solution: During the fixing process, mechanical stirring or circulation system is used to ensure uniform distribution of the fixing solution;

[0068] In step S5, warm water is used for washing, and a drying machine with a set temperature of less than 60° C. is used for drying.

[0069] Summary: This example highlights the advantages of green and environmentally friendly dyeing process. Natural ingredients are used in the preparation of dye liquor to ensure eco-friendliness. At the same time, by controlling dyeing and fixation parameters, color fastness and functional effectiveness are guaranteed. It is suitable for the production of various environmentally friendly textiles to meet the market demand for higher health and functionality.

[0070] Embodiment 2:

[0071] The multifunctional fabric is based on natural plant extracts, the fabric has natural color and has at least one functionality, including but not limited to antibacterial, sun-proof and mosquito-proof functions.

[0072] Summary: By selecting specific natural plant extracts as dye sources, this method not only provides beautiful natural colors, but also, through the addition of functional additives, enables the fabric to have a variety of additional functions in practical applications. It can be widely used in medical textiles, outdoor clothing, household textiles and other fields. The core of this embodiment lies in the versatility of its products. Through the scientific application of plant extracts, the fabric not only meets the aesthetic requirements, but also has practical functionality such as antibacterial and sun protection, which is suitable for the modern market demand that increasingly emphasizes health and safety.

[0073] Example 3: Dyeing of antibacterial fabrics with madder extract

[0074] Steps and detailed instructions:

[0075] Extraction and processing: Rubia cordifolia was selected as the source of dye and functional ingredients, which was first cleaned, dried and crushed, and then the active ingredients were extracted using a mixed solvent of ethanol and water (ratio of 1:15).

[0076] Dye solution preparation: dilute the extract to 5% concentration, adjust the pH to 5 using citric acid, heat to 60°C for 30 minutes to ensure uniform dye solution.

[0077] Dyeing treatment: The fabric is pre-washed and soaked in the dye solution. The temperature and time are controlled at 60℃ and 60 minutes respectively. A stirrer is used to ensure uniform distribution of the dye.

[0078] Fixing treatment: acetic acid was added as a fixing agent (concentration 2%), the fixing temperature was 55°C, and the time was 25 minutes.

[0079] Washing and drying: Use warm water to wash the fixed fabric and dry it at a temperature below 60℃.

[0080] Summary of the embodiment: This embodiment not only achieves beautiful dyeing of fabrics by using madder extract, but also enhances the functionality of the fabric due to the natural antibacterial properties of madder, making it suitable for the production of medical and personal care products that require antibacterial properties.

[0081] Example 4: Dyeing of fabric with sunscreen function using indigo extract

[0082] Steps and detailed instructions:

[0083] Extraction process: Indigo plants are selected, washed, dried and crushed, and then water is used as a solvent (ratio of 1:20) to extract the pigment through heating reflux method.

[0084] Dye solution preparation: Adjust the concentration of the extract to 7%, adjust the pH to 4.5 with acetic acid, and keep warm at 70°C for 45 minutes.

[0085] Dyeing treatment: After pretreatment, the fabric is immersed in the dye solution, and the dyeing temperature and time are controlled at 70℃ and 90 minutes, and stirred regularly.

[0086] Fixation: Alum was used as a fixing agent (3% concentration) and the fixing process was carried out at 50°C for 30 minutes.

[0087] Washing and drying: Wash with warm water and dry at no more than 60°C.

[0088] Summary of the embodiment: This embodiment not only provides the fabric with a rich deep blue color by using indigo extract, but also gives the fabric a sun protection function, which is very suitable for the production of outdoor clothing and sunshade products.

[0089] Summarize:

[0090] These two examples show that the dyeing method based on natural plant extracts is not only environmentally friendly, but also can give fabrics additional functionality, such as antibacterial and sun protection, meeting the market demand for healthy, environmentally friendly and multifunctional textiles. Through the adjustment of these specific operating steps and conditions, dyeing can be performed according to different application requirements, demonstrating the flexibility and practicality of this technology.

[0091] Example 5: Functional fabric dyed with chemical pigments

[0092] Steps and detailed instructions:

[0093] Dye selection and preparation: Select chemical dyes suitable for textiles, prepare dye solution according to the required color concentration, and adjust the pH value to 7.

[0094] Dyeing treatment: Soak the pretreated fabric in the dye solution, control the dyeing temperature to 80℃, the duration is 60 minutes, and use a circulation pump to ensure uniform distribution of the dye.

[0095] Functional addition: Sunscreen and antibacterial agents are added to the dye liquor, each accounting for 2% of the dye liquor volume, to give the fabric additional functions.

[0096] Color fixing treatment: Add zinc acetate as a color fixing agent, control the color fixing temperature at 60°C, and the time is 20 minutes.

[0097] Wash and dry: Wash the fabric in cold water to remove unfixed dye, then dry the fabric at below 60°C.

[0098] Summary of the embodiment: This embodiment achieves a fast and color-saturated dyeing effect by using chemical dyes, and the added functional agent enables the finished fabric to have sun protection and antibacterial properties, making it suitable for the production of functional clothing.

[0099] Summary:

[0100] The above embodiments show multifunctional cloth dyeing methods and products based on natural plant extracts and chemical dyes, which not only have environmental advantages, but also give different functionality to the cloth, such as antibacterial, sunscreen, mosquito repellent, etc. By adopting different natural plant extracts and chemical dyes, combined with specific extraction and dyeing processes, the diversification of cloth colors and the improvement of functionality are finally achieved. Different embodiments show how to meet different application requirements by adjusting process parameters (such as temperature, time, pH value and fixing agent). From Example 1 to Example 5, dyeing technology from natural dyes to chemical dyes is covered, reflecting the requirements of rapid and industrialization from the perspective of environmental protection and functionality. The flexibility and adjustability of natural plant dyeing technology make it occupy an important position in green textiles, and chemical dyes can also meet special market needs by adding functional additives, such as functional clothing, medical supplies and outdoor equipment.

[0101] Test experiment:

[0102] Purpose:

[0103] By conducting dyeing effect and functionality (antibacterial, sunscreen, and mosquito repellent) tests on the fabrics in Examples 1 to 5, the performance differences between the multifunctional fabric dyeing method based on natural plant extracts and the chemical dye dyeing method are evaluated, and the actual effect of the technical solution of the present invention is verified.

[0104] Experimental samples:

[0105] Embodiment 1: Multifunctional fabric dyed with natural plant extracts such as madder, indigo, gardenia, etc., with antibacterial and sunscreen functions.

[0106] Embodiment 2: Cloth dyed with natural plant extracts has antibacterial, sun-proof and mosquito-proof functions.

[0107] Example 3: Dyeing with madder extract, focusing on antibacterial function.

[0108] Example 4: Dyeing with indigo extract, focusing on sun protection function.

[0109] Embodiment 5: Use chemical dyes for dyeing, with sun protection and antibacterial functions.

[0110] Experimental process:

[0111] 1. Color fastness test (washing resistance, friction resistance, light fastness):

[0112] Purpose of the test: To evaluate the adhesion of dyes to fabrics, to test color fastness by washing, rubbing and light exposure, and to verify the stability of the dyeing effect.

[0113] Test method:

[0114] Color fastness to washing: According to GB / T 3921 Textiles - Color fastness - Tests for color fastness to washing, wash the dyed fabric samples in a standard washing machine at 40°C for 30 minutes, and record the color change after washing 5 times.

[0115] Color fastness to rubbing: According to GB / T 3920 Textiles - Color fastness - Color fastness to rubbing, rub the sample 100 times under dry and wet friction conditions, and observe the color shift.

[0116] Color fastness to light: After exposing the dyed sample to a standard light source (simulating natural light) for 72 hours, observe the color change.

[0117] Test data:

[0118] Example Color fastness to washing Color fastness to rubbing Color fastness to light Embodiment 1 4 4 4 Embodiment 2 4 3-4 4 Embodiment 3 4-5 4-5 4 Embodiment 4 4 4 4-5 Embodiment 5 5 5 5

[0119] 2. Antibacterial performance test:

[0120] Purpose of the test: To evaluate the antimicrobial effect of dyed fabrics and verify the effectiveness of functional ingredients in the dyeing process.

[0121] Test method: GB / T 20944.3 "Evaluation of antimicrobial properties of textiles" standard was adopted, Escherichia coli and Staphylococcus aureus were used as test bacteria, the dyed fabric samples were inoculated with bacterial solution respectively, and the antimicrobial activity of the fabric was evaluated after 24 hours of culture.

[0122] Test data:

[0123]

[0124]

[0125] 3. Sun protection performance test (UPF value):

[0126] Purpose of the test: To evaluate the sun protection performance of dyed fabrics to ensure that the fabrics can provide effective UV protection.

[0127] Test method: According to GB / T 18830 "Evaluation of UV protection performance of textiles", use an ultraviolet spectrometer to measure the UPF value (ultraviolet protection factor) of each sample.

[0128] Test data:

[0129] Example UPF value Embodiment 1 40+ Embodiment 2 40+ Embodiment 3 20+ Embodiment 4 50+ Embodiment 5 40+

[0130] 4. Anti-mosquito effect test:

[0131] Purpose of the test: To evaluate the mosquito repellent effect of dyed fabrics and verify the effectiveness of adding mosquito repellents.

[0132] Test method: According to the WHO mosquito repellent standard test, using live mosquito experiments, the dyed fabric samples are placed in a mosquito environment, and the number of mosquito bites is recorded to evaluate the mosquito repellent effect.

[0133] Test data:

[0134]

[0135]

[0136] Experimental results and analysis:

[0137] Color fastness:

[0138] The color fastness of Example 5 (chemical dye) is the best, and the color fastness to washing, friction and light are all level 5, which proves that the chemical dye has strong adhesion.

[0139] The color fastness of Example 3 (Madder extract) and Example 4 (Indigo extract) is good, especially the performance of the Rubia extract after rubbing and washing is better (4-5 grades), which shows the stability of natural plant dyes.

[0140] The color fastness of Examples 1 and 2 (comprehensive use of natural extracts) is slightly weaker, but still reaches level 4, which meets the requirements of daily use.

[0141] Antimicrobial Properties:

[0142] Example 3 (Rubia extract) showed the best antibacterial effect, with an antibacterial rate of 98%, proving that Rubia has significant antibacterial function.

[0143] Examples 1 and 2 also exhibit excellent antibacterial properties, with an antibacterial rate of more than 90%, indicating that the natural plant extracts effectively retain the functional components during the dyeing process.

[0144] The antibacterial property of Example 4 (indigo extract) is relatively weak, indicating that its main functions are reflected in color and sun protection.

[0145] Sun protection performance:

[0146] The UPF value of Example 4 (indigo extract) reaches 50+, showing an excellent sun protection effect, and is suitable for the production of outdoor clothing and sunshade products.

[0147] The UPF values ​​of Examples 1, 2 and 5 all reach 40+, indicating that the sun protection function is effectively demonstrated under the conditions of natural dyes and chemical dyes.

[0148] Anti-mosquito effect:

[0149] Example 2 (containing anti-mosquito functional additive) exhibits the best anti-mosquito effect, with a mosquito bite reduction rate of 85%, and is very suitable for the production of outdoor protective clothing.

[0150] Examples 1 and 5 also have good mosquito repellent effects, proving that the combination of natural extracts and functional additives has good application prospects in the field of mosquito repellent.

[0151] Summarize:

[0152] Through this experiment, it can be seen that the multifunctional fabric dyeing method based on natural plant extracts has excellent performance in color fastness, antibacterial, sun protection and mosquito repellent. Although it is slightly inferior to chemical dyes in terms of color fastness, it has outstanding performance in antibacterial and mosquito repellent functions. In particular, the fabrics using madder and indigo extracts show excellent antibacterial and sun protection effects, which are suitable for the textile market with functional needs such as outdoor, medical and personal care. It can be seen that the technical solution of the present invention not only achieves environmentally friendly dyeing, but also gives the fabric multifunctionality, meeting the dual requirements of green environmental protection and functionalization in the modern textile market, proving the feasibility and superiority of the solution of the present invention.

[0153] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional cloth dyeing method based on natural plant extracts, characterized in that: The following steps are involved: S1. Extraction of natural plants: Extracting natural pigments and functional ingredients from natural plants; S2. Preparation of dye solution: preparing dye solution containing natural plant extracts; S3, dyeing treatment: immersing the fabric in the dye solution, and achieving uniform dyeing of the fabric by controlling dyeing parameters; S4, color fixing treatment: color fixing treatment is performed on the dyed fabric; S5. Washing and drying: Wash and dry the fabric after color fixation.

2. The multifunctional cloth dyeing method based on natural plant extracts according to claim 1, characterized in that: In the step S1, the natural plants include but are not limited to madder, indigo, aloe, pomegranate peel, gardenia and mulberry leaf.

3. The multifunctional cloth dyeing method based on natural plant extracts according to claim 1, characterized in that: In the step S1, the extraction comprises the following steps: a. Pre-treatment of natural plants: cleaning, drying and crushing of natural plants; b. Selection of extraction solvent: water and ethanol are selected for extraction, and the ratio of plant to solvent is 1:10 to 1:20; c. Extraction process: extract natural pigments and functional ingredients through heating reflux extraction and ultrasonic assisted extraction; d. Filtration and concentration: Filter the extract and concentrate it by rotary evaporation or vacuum evaporation equipment; e. Storage and stabilization: The extract should be treated with antiseptic and antioxidant treatment and stored in a light-proof and low-temperature environment.

4. The multifunctional cloth dyeing method based on natural plant extracts according to claim 1, characterized in that: In the step S2, the dye solution preparation includes the following steps: a. Determination of extract concentration: Dilute the plant extract to a concentration range of 1% to 10% according to the desired staining depth; b. pH adjustment: adjust the pH value of the dye solution to between 4 and 6 by adding citric acid or acetic acid; c. Addition of functional additives: according to the functional requirements of the fabric, add natural sunscreen, antibacterial agent or mosquito repellent, the addition amount is 1% to 5% of the dye liquid volume; d. Heating and heat preservation: Heat the dye solution to 40℃~80℃ and maintain a constant temperature; e. Dye liquid filtration: Use filter cloth and filter paper to filter the dye liquid to remove impurities and ensure that the dye liquid is clear and uniform.

5. The multifunctional cloth dyeing method based on natural plant extracts according to claim 1, characterized in that: The step S3 further includes the following steps: a. Fabric pretreatment: clean and moisten the fabric to ensure that the surface is clean and suitable for dyeing; b. Dye soaking: completely immerse the fabric in the dye to ensure even contact with the dye; c. Temperature and time control: Heat the dye solution to 40℃~80℃ through the heating device and keep the temperature constant. The dyeing time is 30min~120min; d. Stirring and circulation: Use a stirrer or circulating dyeing equipment to evenly distribute the dye on the surface of the fabric.

6. The multifunctional cloth dyeing method based on natural plant extracts according to claim 1, characterized in that: In the step S4, the color fixing process comprises the following steps: a. Selection of fixing agent: any one of acetic acid, alum and zinc acetate is selected as the fixing agent, and the concentration of the fixing agent is 1% to 5%; b. Control of color fixing temperature and time: the color fixing temperature is controlled between 40℃ and 60℃, and the color fixing time is 15min to 30min; c. Stirring of the fixing solution: During the fixing process, mechanical stirring or circulation system is used to ensure that the fixing solution is evenly distributed.

7. The multifunctional cloth dyeing method based on natural plant extracts according to claim 1, characterized in that: In the step S5, warm water is used for washing, and a drying machine with a set temperature of less than 60° C. is used for drying.

8. Multifunctional fabric based on natural plant extracts, according to the method for dyeing multifunctional fabric based on natural plant extracts according to claims 1-7, characterized in that: The fabric has a natural color and possesses at least one functionality, including but not limited to antibacterial, sun-proof and mosquito-proof functions.

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