Ultraviolet resistant finishing agent for fabric and ultraviolet resistant silk fabric

Abstract

This invention relates to the field of textile dyeing and finishing technology, and particularly to a UV-resistant finishing agent for fabrics and a UV-resistant silk fabric. First, this invention prepares a UV-resistant finishing agent for fabrics from *Litsea cubeba* residue using a high-temperature sodium hydroxide impregnation method. Then, this UV-resistant finishing agent is used to finish silk fabric, resulting in a silk fabric with UV resistance. This method not only solves the application problem of *Litsea cubeba* residue, but also provides a new way to provide UV protection for fabrics, especially silk fabrics.

Description

Technical Field

[0001] This invention relates to the field of textile dyeing and finishing technology, and in particular to an anti-ultraviolet finishing agent for fabrics and an anti-ultraviolet silk fabric. Background Technology

[0002] In recent years, the reduction of ozone in the atmosphere has led to a continuous increase in the amount of ultraviolet radiation reaching the Earth's surface. Moderate ultraviolet radiation is beneficial to the human body: it promotes vitamin D synthesis, inhibits rickets, and has disinfecting and bactericidal effects. However, excessive ultraviolet radiation is extremely harmful. It can not only increase melanin production and accelerate skin aging, but in severe cases, it can cause blisters, erythema, and even skin cancer. Long-term exposure to excessive ultraviolet radiation can have a series of negative health effects, such as accelerating skin aging; causing skin damage, potentially leading to acne, erythema, and other skin diseases, and even inducing skin cancer; and suppressing the immune system, reducing the body's resistance to bacterial and viral infections, and increasing the risk of certain diseases.

[0003] Therefore, protecting against ultraviolet radiation is particularly important in our daily lives, and it is even more meaningful to give textiles the function of resisting ultraviolet radiation.

[0004] UV-resistant finishing reduces the amount of ultraviolet (UV) light transmitted through fabrics by enhancing their ability to absorb or reflect UV rays. After UV-resistant finishing, UV rays are absorbed by the fabric, thus greatly reducing the amount of UV rays that pass through, providing excellent protection for the human body.

[0005] Litsea cubeba, officially known as mountain pepper, is a unique spice plant resource in China, mainly distributed in the southern region. It boasts advantages such as a short growth cycle and tolerance to poor soil, giving it high ecological value. Its flowers can be used to make tea, its roots can be used to make soup, and its fruits can be used as pillow stuffing, possessing calming, wind-dispelling, cold-dispersing, qi-regulating, and swelling-reducing effects. Furthermore, essential oils can be extracted from the flowers, leaves, and fruits of Litsea cubeba, with the fruit containing the highest content of citral essential oil, which has antioxidant, antibacterial, and mosquito-repellent properties, primarily used in the fragrance industry. However, the extraction of essential oils produces a large amount of residue, which is a significant waste. Existing research indicates that Litsea cubeba residue contains a large amount of flavonoid compounds, which can not only be used as a plant dye but also provide excellent UV protection for dyed fabrics. Therefore, developing and utilizing Litsea cubeba residue to extract effective components as UV-resistant finishing agents can not only address market resource scarcity and reuse but also increase the added value of Litsea cubeba, thereby enhancing its economic and social benefits.

[0006] Meanwhile, there are no reports on the research and development of using Litsea cubeba residue as an anti-UV finishing agent and its application in anti-UV fabrics. In particular, regarding anti-UV finishing agents for silk fabrics, the inherent characteristics of silk make conventional anti-UV finishing agents ineffective. Therefore, it is necessary to conduct relevant technical research on Litsea cubeba as an anti-UV finishing agent to facilitate its application in silk fabrics. Summary of the Invention

[0007] The purpose of this invention is twofold: firstly, to address the utilization of Litsea cubeba, particularly its residue; and secondly, to combine Litsea cubeba with UV-resistant finishing agents, providing a UV-resistant finishing agent for fabrics and a method for preparing UV-resistant silk fabrics using this agent. This invention not only opens up new avenues for the application of Litsea cubeba but also explores new solutions for improving the UV resistance of silk fabrics.

[0008] Specifically, the present invention adopts the following technical solution:

[0009] A UV-resistant finishing agent for fabrics, wherein the UV-resistant finishing agent is prepared by the following steps:

[0010] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10-20 g / L at a material-to-liquid ratio of 1:10-15 and stir until homogeneous;

[0011] (2) Then, raise the temperature to 90-100℃ and treat for 90-120 minutes;

[0012] (3) Then filter and distill the liquid;

[0013] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass to obtain the finished UV-resistant finishing agent.

[0014] Preferably, the concentration of sodium hydroxide in step (1) is 10 g / L.

[0015] Preferably, the material-to-liquid ratio in step (1) is 1:10.

[0016] Preferably, the temperature in step (2) is raised to 98°C and processed for 120 minutes.

[0017] A UV-resistant silk fabric, wherein the UV-resistant silk fabric is prepared by using the UV-resistant finishing agent as described in any one of the preceding claims, and by the following steps:

[0018] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared according to any one of the above claims is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 30-60% of the weight of the finishing solution, and the amount of citric acid is 1-2 g / L of the finishing solution;

[0019] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:10-20, and heat the temperature to 60-80℃ for 60-100 minutes. After treatment, wash the silk fabric and dry it.

[0020] (3) Fixing treatment: Alum or ferrous sulfate is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of alum and ferrous sulfate is 1-5% of the fabric, and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment, and the bath ratio is controlled at 1:10-20, the temperature is controlled at 60-80℃, and the treatment time is 20-40min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0021] Preferably, the amount of citric acid used in step (1) is 2 g / L.

[0022] Preferably, the weight of the UV-resistant finishing agent in step (1) accounts for 30% of the finishing liquid.

[0023] Preferably, in step (2), the bath ratio is 1:20, the temperature is raised to 95°C, and the treatment lasts for 60 minutes.

[0024] The beneficial effects of this invention are:

[0025] (1) This invention solves the problem of the application of Litsea cubeba residue by extracting effective components from the residue after extracting essential oil from Litsea cubeba and using them as an anti-ultraviolet finishing agent;

[0026] (2) This invention uses this low-cost raw material to prepare an anti-ultraviolet finishing agent, and then obtains a fabric with excellent anti-ultraviolet function by high-temperature impregnation, providing a different approach for the preparation of anti-ultraviolet fabrics;

[0027] (3) Compared with ordinary UV-resistant finishing agents, the UV-resistant finishing agent of the present invention has a lower cost, wider availability, and turns waste into treasure, achieving the purpose of comprehensive resource reuse. Furthermore, it uses sodium hydroxide for extraction, which is simple, low-cost, does not cause environmental pollution, and has high extraction efficiency.

[0028] (4) The UV-resistant fabric developed in this invention has good UV protection effect, is safe and comfortable to wear, and will not cause cancer, birth defects or allergic reactions; it has good compatibility with the ecological environment, can be biodegradable, makes full use of natural resources, and has a very broad market prospect. Detailed Implementation

[0029] Representative embodiments will now be further refined. It should be understood that the following description is not intended to limit the embodiments to a single preferred embodiment. Rather, it is intended to cover alternatives, modifications, and equivalents that may be included within the substance and scope of the embodiments defined by the appended claims.

[0030] To address the existing problems, this invention provides a UV-resistant finishing agent for fabrics based on Litsea cubeba residue. Specific implementation methods are as follows.

[0031] Example 1: This invention first provides a UV-resistant finishing agent for fabrics, which is prepared by the following steps:

[0032] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:10 and stir until homogeneous;

[0033] (2) Then, raise the temperature to 98°C and process for 120 min;

[0034] (3) Then filter and distill the liquid;

[0035] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass, which is the finished UV-resistant finishing agent.

[0036] The prepared UV-resistant finishing agent is then used to treat the silk fabric according to the following steps to prepare a UV-resistant silk fabric:

[0037] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared above is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 30% of the weight of the finishing solution, and the amount of citric acid is 2 g / L of the finishing solution;

[0038] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:20 and heat the temperature to 95℃ for 60 minutes. After the treatment, wash the silk fabric and dry it.

[0039] (3) Fixing treatment: Alum is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of alum is 3% of the fabric and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment. The bath ratio is controlled at 1:20, the temperature is controlled at 60℃, and the treatment time is 40min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0040] (4) Soap washing treatment: The UV-resistant silk fabric with UV function obtained in step (3) is soap washed 20 times and then dried.

[0041] After testing, the UPF (ultraviolet protection factor) value of the silk fabric was 75.12, and the UVA transmittance of the fabric was 2.6%; after 20 washes, the UPF value of the silk fabric was 62.35, and the UVA transmittance of the fabric was 2.75%.

[0042] According to the "Evaluation of Ultraviolet Protection Performance of Textiles" standard issued by the State Administration for Quality Supervision, Inspection and Quarantine, the sample in this case has a UPF value greater than 40 and a UVA transmittance of less than 5%, therefore it meets the relevant regulations and is classified as an ultraviolet protection product.

[0043] Example 2: In this example, a UV-resistant finishing agent for fabrics is first prepared. The UV-resistant finishing agent is prepared by the following steps:

[0044] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:10 and stir until homogeneous;

[0045] (2) Then, raise the temperature to 90°C and process for 120 min;

[0046] (3) Then filter and distill the liquid;

[0047] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass, which is the finished UV-resistant finishing agent.

[0048] A UV-resistant silk fabric was prepared by following the steps outlined in the UV-resistant finishing agent:

[0049] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared according to any one of the above claims is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 30% of the weight of the finishing solution, and the amount of citric acid is 2 g / L of the finishing solution;

[0050] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:20 and heat the temperature to 95℃ for 60 minutes. After the treatment, wash the silk fabric and dry it.

[0051] (3) Fixing treatment: Alum is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of alum is 3% of the fabric and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment. The bath ratio is controlled at 1:20, the temperature is controlled at 80℃, and the treatment time is 40min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0052] (4) Soap washing treatment: The UV-resistant silk fabric with UV function obtained in step (3) is soap washed 20 times and then dried.

[0053] After testing, the UPF (Ultraviolet Protection Factor) value of the silk fabric was 74.43, and the UVA transmittance of the fabric was 2.3%. After 20 washes, the UPF value of the silk fabric was 61.78, and the UVA transmittance of the fabric was 2.44%.

[0054] According to the "Evaluation of Ultraviolet Protection Performance of Textiles" standard issued by the State Administration for Quality Supervision, Inspection and Quarantine, the sample in this case has a UPF value greater than 40 and a UVA transmittance of less than 5%, therefore it meets the relevant regulations and is classified as an ultraviolet protection product.

[0055] Example 3: In this example, a UV-resistant finishing agent for fabrics is first prepared. The UV-resistant finishing agent is prepared by the following steps:

[0056] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:10 and stir until homogeneous;

[0057] (2) Then, raise the temperature to 100℃ and process for 120 min;

[0058] (3) Then filter and distill the liquid;

[0059] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass, which is the finished UV-resistant finishing agent.

[0060] Then, the prepared UV-resistant finishing agent is used to prepare a UV-resistant silk fabric according to the following steps:

[0061] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared according to any one of the above claims is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 30% of the weight of the finishing solution, and the amount of citric acid is 2 g / L of the finishing solution;

[0062] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:20 and heat the temperature to 95℃ for 60 minutes. After the treatment, wash the silk fabric and dry it.

[0063] (3) Fixing treatment: Alum is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of alum is 3% of the fabric and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment. The bath ratio is controlled at 1:20, the temperature is controlled at 80℃, and the treatment time is 40min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0064] (4) Soap washing treatment: The UV-resistant silk fabric with UV function obtained in step (3) is soap washed 20 times and then dried.

[0065] After testing, the UPF (Ultraviolet Protection Factor) value of the silk fabric was 80.32, and the UVA transmittance of the fabric was 1.8%. After 20 washes, the UPF value of the silk fabric was 66.67, and the UVA transmittance of the fabric was 1.91%.

[0066] According to the "Evaluation of Ultraviolet Protection Performance of Textiles" standard issued by the State Administration for Quality Supervision, Inspection and Quarantine, the sample in this case has a UPF value greater than 40 and a UVA transmittance of less than 5%, therefore it meets the relevant regulations and is classified as an ultraviolet protection product.

[0067] Example 4:

[0068] A UV-resistant finishing agent for fabrics, wherein the UV-resistant finishing agent is prepared by the following steps:

[0069] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:10 and stir until homogeneous;

[0070] (2) Then, raise the temperature to 100℃ and process for 90 min;

[0071] (3) Then filter and distill the liquid;

[0072] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass to obtain the finished UV-resistant finishing agent.

[0073] Using the aforementioned UV-resistant finishing agent, a UV-resistant silk fabric is prepared, which is obtained through the following steps:

[0074] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared above is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 40% of the weight of the finishing solution, and the amount of citric acid is 1 g / L of the finishing solution;

[0075] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:10, heat the temperature to 60-80℃, treat for 60-100 minutes, and after treatment, wash the silk fabric and dry it.

[0076] (3) Fixing treatment: Ferrous sulfate is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of ferrous sulfate is 2% of the fabric and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment. The bath ratio is controlled at 1:10, the temperature is controlled at 80℃, and the treatment time is 20min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0077] (4) Soap washing treatment: The UV-resistant silk fabric with UV function obtained in step (3) is soap washed 20 times and then dried.

[0078] After testing, the UPF (Ultraviolet Protection Factor) value of the silk fabric was 85.54, and the UVA transmittance of the fabric was 1.8%. After 20 washes, the UPF value of the silk fabric was 70.99, and the UVA transmittance of the fabric was 1.92%.

[0079] According to the "Evaluation of Ultraviolet Protection Performance of Textiles" standard issued by the State Administration for Quality Supervision, Inspection and Quarantine, the sample in this case has a UPF value greater than 40 and a UVA transmittance of less than 5%, therefore it meets the relevant regulations and is classified as an ultraviolet protection product.

[0080] Example 5:

[0081] A UV-resistant finishing agent for fabrics, wherein the UV-resistant finishing agent is prepared by the following steps:

[0082] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:10 and stir until homogeneous;

[0083] (2) Then, raise the temperature to 100℃ and process for 90 min;

[0084] (3) Then filter and distill the liquid;

[0085] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass to obtain the finished UV-resistant finishing agent.

[0086] Using the aforementioned UV-resistant finishing agent, a UV-resistant silk fabric is prepared, which is obtained through the following steps:

[0087] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared above is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 40% of the weight of the finishing solution, and the amount of citric acid is 1 g / L of the finishing solution;

[0088] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:10, heat the temperature to 80℃, and treat for 70 minutes. After treatment, wash the silk fabric and dry it.

[0089] (3) Fixing treatment: Ferrous sulfate is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of ferrous sulfate is 3% of the fabric and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment. The bath ratio is controlled at 1:10, the temperature is controlled at 80℃, and the treatment time is 20min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0090] (4) Soap washing treatment: The UV-resistant silk fabric with UV function obtained in step (3) is soap washed 20 times and then dried.

[0091] After testing, the UPF (Ultraviolet Protection Factor) value of the silk fabric was 95.12, and the UVA transmittance of the fabric was 1.8%. After 20 washes, the UPF value of the silk fabric was 78.95, and the UVA transmittance of the fabric was 1.91%.

[0092] According to the "Evaluation of Ultraviolet Protection Performance of Textiles" standard issued by the State Administration for Quality Supervision, Inspection and Quarantine, the sample in this case has a UPF value greater than 40 and a UVA transmittance of less than 5%, therefore it meets the relevant regulations and is classified as an ultraviolet protection product.

[0093] Example 6:

[0094] A UV-resistant finishing agent for fabrics, wherein the UV-resistant finishing agent is prepared by the following steps:

[0095] (1) First, add the residue of Litsea cubeba to a sodium hydroxide solution with a concentration of 10 g / L at a material-to-liquid ratio of 1:10 and stir until homogeneous;

[0096] (2) Then, raise the temperature to 100℃ and process for 90 min;

[0097] (3) Then filter and distill the liquid;

[0098] (4) The filtrate is concentrated by distillation to 1 / 2 of its initial mass to obtain the finished UV-resistant finishing agent.

[0099] Using the aforementioned UV-resistant finishing agent, a UV-resistant silk fabric is prepared, which is obtained through the following steps:

[0100] (1) Preparation of finishing solution: The UV-resistant finishing agent prepared above is mixed with citric acid and then water to obtain a finishing solution; the weight of the UV-resistant finishing agent accounts for 40% of the weight of the finishing solution, and the amount of citric acid is 1 g / L of the finishing solution;

[0101] (2) Finishing treatment: Put the silk fabric into the finishing solution obtained in step (1); then adjust the bath ratio to 1:10 and heat the temperature to 60℃ for 100 minutes. After treatment, wash the silk fabric and dry it.

[0102] (3) Fixing treatment: Ferrous sulfate is used as a fixing agent and mixed with water to prepare a fixing treatment solution. The amount of ferrous sulfate is 2% of the fabric and the remainder is water. The silk fabric after the finishing treatment in step (2) is placed into the fixing treatment solution for treatment. The bath ratio is controlled at 1:10, the temperature is controlled at 80℃, and the treatment time is 20min. Finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

[0103] (4) Soap washing treatment: The UV-resistant silk fabric with UV function obtained in step (3) is soap washed 20 times and then dried.

[0104] After testing, the UPF (Ultraviolet Protection Factor) value of the silk fabric was 99.54, and the UVA transmittance of the fabric was 1.5%. After 20 washes, the UPF value of the silk fabric was 82.62, and the UVA transmittance of the fabric was 1.59%.

[0105] According to the "Evaluation of Ultraviolet Protection Performance of Textiles" standard issued by the State Administration for Quality Supervision, Inspection and Quarantine, the sample in this case has a UPF value greater than 40 and a UVA transmittance of less than 5%, therefore it meets the relevant regulations and is classified as an ultraviolet protection product.

[0106] Examples 1-6 illustrate how the present invention first prepares a UV-resistant finishing agent for fabrics, and then uses this UV-resistant finishing agent to prepare a UV-resistant silk fabric.

[0107] This invention solves the problem of the application of Litsea cubeba residue by extracting effective components from the residue after extracting essential oil from Litsea cubeba and using them as an anti-ultraviolet finishing agent.

[0108] This invention uses low-cost raw materials to prepare an anti-UV finishing agent, which is then used for anti-UV finishing of silk fabrics, resulting in a silk fabric with excellent UV protection properties, providing a new approach to UV protection for silk fabrics.

[0109] The UV-resistant silk fabric developed in this invention exhibits excellent UV protection with low UVA transmittance, meeting national standards for UV resistance. The low cost of raw materials and the simplicity of the preparation process significantly reduce the overall cost, including finishing agents and their use in preparing the UV-resistant silk fabric, resulting in a very promising market prospect.

[0110] It will be apparent to those skilled in the art that modifications, combinations, and variations can be made to the teachings described above.

Claims

1. A fabric face finish for ultraviolet resistance characterized in that: The anti-ultraviolet finishing agent is prepared by the following steps: (1) First, the Litsea Cubeba residue is added into a sodium hydroxide solution with a concentration of 10-20 g / L according to a material-liquid ratio of 1:10-15, and stirred uniformly; the concentration of sodium hydroxide is 10 g / L; the material-liquid ratio is 1:10; (2) Then, the temperature is increased to 90-100 ℃, and treated for 90-120 min; (3) Then, the material-liquid is filtered and distilled; (4) The filtrate is distilled and concentrated to 1 / 2 of the initial mass to obtain the finished anti-ultraviolet finishing agent.

2. The fabric UV resistant finish as claimed in claim 1, wherein: In the step (2), the temperature is increased to 98 ℃, and treated for 120 min.

3. An anti-UV real silk fabric, characterized in that: The anti-ultraviolet silk fabric is prepared by the anti-ultraviolet finishing agent according to any one of the preceding claims, and by the following steps: (1) Finishing liquid preparation: the anti-ultraviolet finishing agent prepared according to any one of the preceding claims is added with citric acid, and then mixed uniformly with water to obtain a finishing liquid; the weight of the anti-ultraviolet finishing agent accounts for 30-60% of the weight of the finishing liquid, and the amount of citric acid is 1-2 g / L of the finishing liquid; (2) Finishing treatment: the silk fabric is placed into the finishing liquid obtained in the step (1); then the bath ratio is adjusted to 1:10-20, and the temperature is heated to 60-80 ℃, and treated for 60-100 min; after the treatment, the silk fabric is washed and dried; (3) Color fixing treatment: alum or ferrous sulfate is mixed with water to prepare a color fixing treatment liquid, and the amount of alum or ferrous sulfate is 1-5% of the fabric, and the rest is water; the silk fabric treated in the step (2) is placed into the color fixing treatment liquid for treatment, and the bath ratio is controlled to be 1:10-20, the temperature is controlled to be 60-80 ℃, and the treatment time is 20-40 min; finally, the silk fabric is washed and dried to obtain an anti-ultraviolet silk fabric with ultraviolet function.

4. The anti-UV finishing agent according to claim 3, characterized in that: In the step (1), the amount of citric acid is 2 g / L.

5. The anti-UV finishing agent according to claim 3, characterized in that: In the step (1), the weight of the anti-ultraviolet finishing agent accounts for 30% of the finishing liquid.

6. The anti-UV finishing agent according to claim 3, characterized in that: In the step (2), the bath ratio is 1:20, heated to 95 ℃, and treated for 60 min.

7. The fabric UV resistant finish according to claim 1, characterized in that: For silk fabric dyeing.