Safe processing technology of silk thread

Abstract

The application provides a safe processing technology of silk wadding. The technology comprises the following steps: S1, dipping the silk wadding to be treated in a pretreatment liquid with pH of 7.5-8.0 and containing biological enzymes for degumming, wherein the biological enzymes comprise alkaline pectinase and alkaline protease; S2, washing the degummed silk wadding with a first washing liquid with temperature of 35-45 DEG C and containing non-ionic surfactant, then washing the silk wadding with a second washing liquid with temperature of 55-65 DEG C and containing chelating agent, and then rinsing the silk wadding; S3, dehydrating the rinsed silk wadding and adjusting the pH to 6.5-7.0 by using an organic acid; and S4, post-finishing the silk wadding treated in step S3 in a finishing liquid containing a plant-based softening agent, and drying. The biological enzyme pretreatment, temperature gradient washing, pH adjustment and softening post-finishing are combined, the impurities in the silk wadding can be deeply removed, the safety and low allergenicity of the finished product can be ensured, and the natural skin-friendliness of the silk can be maintained.

Description

Technical Field

[0001] This application relates to the field of textile technology, and in particular to a safe processing technology for silk floss. Background Technology

[0002] Silk, as a natural protein fiber, has excellent moisture absorption, breathability, skin-friendliness, and natural silk luster, and is widely used in textiles such as home textiles and children's bedding.

[0003] However, natural silk floss contains a large amount of sericin, oils, waxes, and trace amounts of heavy metal ions adsorbed during growth and initial processing. To obtain silk floss with a fluffy feel and high cleanliness, it is necessary to degumme and refine it.

[0004] In related technologies, alkaline protease is commonly used for degumming. For example, one method involves spraying silkworm cocoons with a sodium hydroxide-containing solution to produce silk floss sheets. These sheets are then placed in a degumming solution containing alkaline protease for refining and degumming. The degumming solution is then heated to above 95°C to inactivate the alkaline protease. After washing, finishing, dehydration, and drying, the silk floss is manually loosened to produce a silk quilt. However, this method uses strong alkalis such as sodium hydroxide for spraying, which can leave alkaline residues in the finished product, potentially irritating children's skin. Furthermore, the finished product does not meet the highest cleanliness standards.

[0005] Some methods employ multiple chemical refining processes. For example, one approach uses low-temperature plasma pretreatment and multiple chemical refining processes such as primary refining, secondary refining, and bleaching, and modifies the product with glutaraldehyde and amino silicone oil. However, this approach has an extremely complex process and uses chemical crosslinking agents such as glutaraldehyde, which have certain toxicity and irritation. This can easily lead to harmful chemical residues in the finished product, failing to meet the high cleanliness and low allergenicity safety requirements for children's textiles. Summary of the Invention

[0006] This application provides a safe processing technology for silk floss to solve the above-mentioned technical problems.

[0007] To achieve the above objectives, the technical solution of this application is as follows: This application provides a safe processing technology for silk floss, which includes the following steps: S1. The silk floss to be treated is immersed in a pretreatment solution containing biological enzymes with a pH of 7.5-8.0 for degumming, wherein the biological enzymes include alkaline pectinase and alkaline protease; S2. The degummed silk floss is washed with a first washing solution containing a nonionic surfactant at a temperature of 35℃-45℃, and then the silk floss is washed with a second washing solution containing a chelating agent at a temperature of 55℃-65℃, followed by rinsing the silk floss. S3. After rinsing and dehydrating the silk floss, adjust the pH to 6.5-7.0 using organic acid; S4. The silk floss treated in step S3 is placed in a finishing solution containing a plant-derived softener for post-finishing and then dried. In one embodiment of this application, the concentration of the biological enzyme in the pretreatment solution in step S1 is 2 g / L-4 g / L, preferably 2.5 g / L-3.5 g / L.

[0008] In one embodiment of this application, in step S1, the mass ratio of alkaline pectinase to alkaline protease is 0.5-1.5:1.5-2.5, preferably 0.8-1.5:1.8-2.5.

[0009] In one embodiment of this application, in step S1, the temperature of the pretreatment liquid is 50°C-60°C, preferably 54°C-60°C.

[0010] In one embodiment of this application, during the degumming process in step S1, the bath ratio is 1:25-35, preferably 1:28-35.

[0011] In one embodiment of this application, in step S2, the concentration of the nonionic surfactant in the first washing liquid is 2 g / L-4 g / L, preferably 2.5 g / L-3.5 g / L.

[0012] In one embodiment of this application, in step S2, the nonionic surfactant includes dodecylamine polyoxyethylene ether.

[0013] In one embodiment of this application, in step S2, the concentration of the chelating agent in the second washing solution is 0.5 g / L-1.5 g / L, preferably 0.8 g / L-1.1 g / L.

[0014] In one embodiment of this application, in step S3, the organic acid includes citric acid and / or acetic acid.

[0015] In one embodiment of this application, the concentration of the plant-derived softener in the finishing solution in step S4 is 2 g / L-4 g / L, preferably 2.5 g / L-3.5 g / L.

[0016] In one embodiment of this application, during the post-treatment process described in step S4, the liquor ratio is 1:8-15, preferably 1:10-15.

[0017] In one embodiment of this application, in step S4, the drying includes baking and / or air drying.

[0018] In one embodiment of this application, the drying temperature in step S4 is less than 80°C.

[0019] The technical solution provided in this application has at least the following beneficial effects: This application employs a bio-enzyme containing alkaline pectinase and alkaline protease to pretreat silk floss under mild conditions (pH 7.5-8.0). Alkaline pectinase effectively removes pectin and hemicellulose from the surface of the silk floss, disrupting the adhesion medium between sericin and fibroin, causing the microstructure of sericin protein to swell and loosen. Alkaline protease specifically catalyzes the hydrolysis of peptide bonds in the main chain of sericin protein, degrading it into water-soluble small-molecule peptides or amino acids, thus achieving sericin peeling. A gradient temperature-controlled washing process combining "temperature gradient" and "targeted impurity removal with additives" further removes impurities such as natural oils, gums, waxes, and heavy metal ions from the silk floss. The first warm water wash (35℃-45℃) utilizes the emulsifying, dispersing, and penetrating effects of nonionic surfactants to emulsify and suspend the natural oils, waxes, and enzymatically generated peptide fragments on the silk surface in the aqueous phase at a lower temperature, avoiding the problem of oil remelting and secondary adsorption caused by high temperatures. The second hot water wash (55℃-65℃) further swells residual sericin at a higher temperature, while chelating agents effectively complex residual heavy metal ions, achieving simultaneous removal of heavy metals and residual sericin. The third room temperature rinse, through the rapid cooling and shrinkage effect of room temperature water, closes the micropores of the silk fibers, deeply cleaning away any remaining trace impurities and improving the cleanliness of the finished product. Subsequent processes stabilize the pH value of the silk floss within the range of 6.5-7.0, which is compatible with the natural physiological environment of children's skin, effectively reducing the damage and irritation of alkaline residues to children's skin barrier. Simultaneously, plant-derived softeners are used, allowing them to adhere evenly to the surface of the silk fibers, reducing the coefficient of friction between fibers, giving it fluffiness and a smooth feel, and eliminating harmful allergens, ensuring the safety and low allergenicity of the finished product. In other words, this application combines bio-enzyme pretreatment, temperature gradient washing, pH adjustment, and softening finishing to deeply remove impurities from silk floss, reduce allergen content, ensure the safety and low allergenicity of the finished product, and maintain the natural skin-friendly properties of silk. Detailed Implementation

[0020] The technical solution of this application will be clearly and completely described below with reference to the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0021] In related technologies, alkaline protease is commonly used for degumming. For example, one method involves spraying silkworm cocoons with a sodium hydroxide-containing solution to produce silk floss sheets. These sheets are then placed in a degumming solution containing alkaline protease for refining and degumming. The degumming solution is then heated to above 95°C to inactivate the alkaline protease. After washing, finishing, dehydration, and drying, the silk floss is manually loosened to produce a silk quilt. However, this method uses strong alkalis such as sodium hydroxide for spraying, which can leave alkaline residues in the finished product, potentially irritating children's skin. Furthermore, the finished product does not meet the highest cleanliness standards.

[0022] Some methods employ multiple chemical refining processes. For example, one approach uses low-temperature plasma pretreatment and multiple chemical refining processes such as primary refining, secondary refining, and bleaching, and modifies the product with glutaraldehyde and amino silicone oil. However, this approach has an extremely complex process and uses chemical crosslinking agents such as glutaraldehyde, which have certain toxicity and irritation. This can easily lead to harmful chemical residues in the finished product, failing to meet the high cleanliness and low allergenicity safety requirements for children's textiles.

[0023] In summary, traditional silkworm cocoon processing techniques result in a tight bond between sericin and fibroin fibers, requiring strong alkali and high-temperature hydrolysis. However, this highly alkaline and high-temperature environment not only severely erodes the sericin but also inevitably causes partial hydrolysis of the fibroin fibers, leading to decreased fiber strength and a stiff feel. More seriously, strong alkali and chemical additives easily remain inside the silk, and the finished product typically has an alkaline pH. This can easily trigger contact dermatitis and skin allergies in infants and children whose skin barriers are not fully developed and whose stratum corneum is delicate. Furthermore, incomplete traditional degumming can lead to excessive residual sericin and oils, which can easily breed bacteria and mites in humid environments, potentially causing respiratory illnesses in children.

[0024] In view of the above-mentioned technical problems, one embodiment of this application provides a safe treatment process for silk floss, which includes the following steps: S1. The silk floss to be treated is immersed in a pretreatment solution containing biological enzymes with a pH of 7.5-8.0 for degumming. The biological enzymes include alkaline pectinase and alkaline protease. S2. Wash the degummed silk floss with a first washing solution containing nonionic surfactant at a temperature of 35℃-45℃, then wash the silk floss with a second washing solution containing chelating agent at a temperature of 55℃-65℃, and then rinse the silk floss. S3. After rinsing and dehydrating the silk floss, adjust the pH to 6.5-7.0 using organic acid; S4. Place the silk floss treated in step S3 into a finishing solution containing plant-derived softener for post-finishing and then dry. In natural silk, sericin and fibroin fibers are tightly bound together by hydrogen bonds and electrostatic attraction. Furthermore, the surface of sericin is typically coated with natural hydrophobic waxes and oils, making it difficult for conventional mild washing media to penetrate and remove it. Secondly, silk readily absorbs and retains trace amounts of heavy metal ions during its growth and initial processing. These heavy metal ions usually form tight coordination bonds with active groups such as carboxyl and amino groups in sericin, making them extremely difficult to remove with conventional washing. Moreover, after degumming, the silk fibers, lacking the protection of sericin, are prone to macromolecular chain rearrangement and hydrogen bond cross-linking during drying, leading to fiber embrittlement and hardening. Additionally, traditional softeners often contain harmful substances such as formaldehyde or alkylphenol polyoxyethylene ethers, which can easily remain in the finished product and irritate children's delicate skin.

[0025] This application employs a bio-enzyme containing alkaline pectinase and alkaline protease to pretreat silk floss under mild conditions (pH 7.5-8.0). Alkaline pectinase effectively removes pectin and hemicellulose from the surface of the silk floss, disrupting the adhesion medium between sericin and fibroin, causing the microstructure of sericin protein to swell and loosen. Alkaline protease specifically catalyzes the hydrolysis of peptide bonds in the main chain of sericin protein, degrading it into water-soluble small-molecule peptides or amino acids, thus achieving sericin peeling. A gradient temperature-controlled washing process combining "temperature gradient" and "targeted impurity removal with additives" further removes impurities such as natural oils, gums, waxes, and heavy metal ions from the silk floss. The first warm water wash (35℃-45℃) utilizes the emulsifying, dispersing, and penetrating effects of nonionic surfactants to emulsify and suspend the natural oils, waxes, and enzymatically generated peptide fragments on the silk surface in the aqueous phase at a lower temperature, avoiding the problem of oil remelting and secondary adsorption caused by high temperatures. The second hot water wash (55℃-65℃) further swells residual sericin at a higher temperature, while chelating agents effectively complex residual heavy metal ions, achieving simultaneous removal of heavy metals and residual sericin. The third room temperature rinse, through the rapid cooling and shrinkage effect of room temperature water, closes the micropores of the silk fibers, deeply cleaning away any remaining trace impurities and improving the cleanliness of the finished product. Subsequent processes stabilize the pH value of the silk floss within the range of 6.5-7.0, which is compatible with the natural physiological environment of children's skin, effectively reducing the damage and irritation of alkaline residues to children's skin barrier. Simultaneously, plant-derived softeners are used, allowing them to adhere evenly to the surface of the silk fibers, reducing the coefficient of friction between fibers, giving it fluffiness and a smooth feel, and eliminating harmful allergens, ensuring the safety and low allergenicity of the finished product. In other words, this application combines bio-enzyme pretreatment, temperature gradient washing, pH adjustment, and softening finishing to deeply remove impurities from silk floss, reduce allergen content, ensure the safety and low allergenicity of the finished product, and maintain the natural skin-friendly properties of silk.

[0026] In one embodiment of this application, in step S1, the temperature of the pretreatment solution is 50℃-60℃, preferably 54℃-60℃. The concentration of the biological enzyme in the pretreatment solution is 2g / L-4g / L, preferably 2.5g / L-3.5g / L. The mass ratio of alkaline pectinase to alkaline protease is 0.5-1.5:1.5-2.5, preferably 0.8-1.5:1.8-2.5. The pH of the pretreatment solution can be adjusted to 7.5-8.0 using sodium hydroxide solution. During degumming, the bath ratio is 1:25-35, preferably 1:28-35. The soaking time is 35min-45min, preferably 38min-45min.

[0027] In one embodiment of this application, in step S2, the concentration of the nonionic surfactant in the first washing solution is 2 g / L-4 g / L, preferably 2.5 g / L-3.5 g / L. The nonionic surfactant includes dodecylamine polyoxyethylene ether (i.e., TF-1201). In the second washing solution, the concentration of the chelating agent is 0.5 g / L-1.5 g / L, preferably 0.8 g / L-1.1 g / L. The washing time for each wash is 35 min-45 min, preferably 38 min-45 min.

[0028] In one embodiment of this application, in step S3, the organic acid includes citric acid and / or acetic acid.

[0029] In one embodiment of this application, in step S4, the concentration of the plant-derived softener in the finishing solution is 2 g / L-4 g / L, preferably 2.5 g / L-3.5 g / L. During the post-finishing process, the liquor ratio is 1:8-15, preferably 1:10-15. Drying includes oven drying and / or air drying. The drying temperature is less than 80°C.

[0030] In this application, silk floss refers to a net-like or flocculent product made from silkworm cocoons, cocoon shells, or by-products of silk processing.

[0031] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the term "and / or" in this application merely describes the relationship between related objects, indicating that three relationships may exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

[0032] Example 1 This embodiment provides a safe processing technology for silk floss, the specific steps of which are as follows: S1. Add alkaline pectinase and alkaline protease to deionized water, and add sodium hydroxide solution with a concentration of 0.01 mol / L to adjust the pH to 7.5, so as to obtain a pretreatment solution with a concentration of 1 g / L of alkaline pectinase and a concentration of 2 g / L of alkaline protease. The silk floss to be treated (100 kg, specifically mulberry silk floss) was immersed in a pretreatment solution at 55°C for degumming, with a bath ratio of 1:10 and an immersion time of 40 min. S2. Add nonionic surfactant TF-1201 to deionized water and stir until homogeneous to obtain a first washing solution with a concentration of nonionic surfactant TF-1201 of 3 g / L. Add chelating agent TF-1277 to deionized water and stir well to obtain a second washing solution with a concentration of 1 g / L of chelating agent TF-1277. Remove the silk floss and wash the degummed silk floss with a first washing solution at a temperature of 40℃ for 40 minutes, then drain. The silk floss was then washed with a second washing solution at a temperature of 60°C for 40 minutes, and then drained. Next, rinse the silk floss with room temperature water for 40 minutes, then drain. S3. Place the rinsed silk floss in a dehydrator for dehydration, then remove the silk floss and place it in a citric acid solution to adjust the pH of the silk floss to 6.5; S4. Add plant-derived fabric softener TF-6102 (formaldehyde-free) to deionized water, stir well, and obtain a finishing solution with a concentration of 3g / L of plant-derived fabric softener TF-6102. The silk floss treated in step S3 is placed in a finishing solution for post-finishing, with a liquor ratio of 1:10. Then, the silk floss was placed in an oven and dried at 70°C until dry. Example 2 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S1. Add alkaline pectinase and alkaline protease to deionized water, and add sodium hydroxide solution with a concentration of 0.01 mol / L to adjust the pH to 7.5, so as to obtain a pretreatment solution with a concentration of alkaline pectinase of 0.5 g / L and a concentration of alkaline protease of 1.5 g / L. The silk floss to be treated (100 kg) was immersed in a pretreatment solution at 55°C for degumming, with a bath ratio of 1:10 and an immersion time of 40 min. The difference between this embodiment and Example 1 is that the concentration of biological enzymes (including alkaline pectinase and alkaline protease) in the pretreatment solution is 2 g / L.

[0033] Example 3 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S1. Add alkaline pectinase and alkaline protease to deionized water, and add sodium hydroxide solution with a concentration of 0.01 mol / L to adjust the pH to 7.5, to obtain a pretreatment solution with a concentration of alkaline pectinase of 1.5 g / L and a concentration of alkaline protease of 2.5 g / L. The silk floss to be treated (100 kg) was immersed in a pretreatment solution at 55°C for degumming, with a bath ratio of 1:10 and an immersion time of 40 min. The difference between this embodiment and Example 1 is that the concentration of the biological enzyme in the pretreatment solution is 4 g / L.

[0034] Comparative Example 1 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S1. Add alkaline pectinase and alkaline protease to deionized water, and add sodium hydroxide solution with a concentration of 0.01 mol / L to adjust the pH to 7.5, to obtain a pretreatment solution with a concentration of alkaline pectinase of 0.33 g / L and a concentration of alkaline protease of 0.67 g / L. The silk floss to be treated (100 kg) was immersed in a pretreatment solution at 55°C for degumming, with a bath ratio of 1:10 and an immersion time of 40 min. The difference between Comparative Example 1 and Example 1 is that the concentration of alkaline pectinase in the pretreatment solution is 0.33 g / L and the concentration of alkaline protease is 0.67 g / L.

[0035] In this comparative example, the concentration of the biological enzyme in the pretreatment solution was 1 g / L.

[0036] Comparative Example 2 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S1. Add alkaline protease to deionized water and add sodium hydroxide solution with a concentration of 0.01 mol / L to adjust the pH to 7.5, so as to obtain a pretreatment solution with an alkaline protease concentration of 2 g / L. The silk floss to be treated (100 kg) was immersed in a pretreatment solution at 55°C for degumming, with a bath ratio of 1:10 and an immersion time of 40 min.

[0037] The difference between this comparative example and Example 1 is that alkaline pectinase was not added to the treatment solution.

[0038] Comparative Example 3 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S1. Add alkaline pectinase to deionized water and add sodium hydroxide solution with a concentration of 0.01 mol / L to adjust the pH to 7.5, so as to obtain a pretreatment solution with an alkaline pectinase concentration of 1 g / L. The silk floss to be treated (100 kg) was immersed in a pretreatment solution at 55°C for degumming, with a bath ratio of 1:10 and an immersion time of 40 min.

[0039] The difference between this comparative example and Example 1 is that alkaline protease was not added to the treatment solution.

[0040] Comparative Example 4 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S2. Add nonionic surfactant TF-1201 to deionized water and stir until homogeneous to obtain a first washing solution with a concentration of nonionic surfactant TF-1201 of 3 g / L. Add chelating agent TF-1277 to deionized water and stir well to obtain a second washing solution with a concentration of 1 g / L of chelating agent TF-1277. Remove the silk floss and wash the degummed silk floss with a first washing solution at a temperature of 40℃ for 40 minutes, then drain. The silk floss was then washed with a second washing solution at a temperature of 40°C for 40 minutes, and then drained. Next, the silk floss is rinsed with warm water at 40℃ for 40 minutes, and then drained.

[0041] The difference between this comparative example and Example 1 is that temperature gradient washing was not performed.

[0042] Comparative Example 5 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S2. Add nonionic surfactant TF-1201 to deionized water and stir until homogeneous to obtain a first washing solution with a concentration of nonionic surfactant TF-1201 of 3 g / L. Add chelating agent TF-1277 to deionized water and stir well to obtain a second washing solution with a concentration of 1 g / L of chelating agent TF-1277. Remove the silk floss and wash the degummed silk floss with a first washing solution at a temperature of 60℃ for 40 minutes, then drain. The silk floss was then washed with a second washing solution at a temperature of 60°C for 40 minutes, and then drained. Next, the silk floss is rinsed with warm water at 60℃ for 40 minutes, and then drained.

[0043] The difference between this comparative example and Example 1 is that temperature gradient washing was not performed.

[0044] Comparative Example 6 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S2. Add nonionic surfactant TF-1201 to deionized water and stir until homogeneous to obtain a first washing solution with a concentration of nonionic surfactant TF-1201 of 3 g / L. Add chelating agent TF-1277 to deionized water and stir well to obtain a second washing solution with a concentration of 1 g / L of chelating agent TF-1277. Remove the silk floss and wash the degummed silk floss with room temperature first washing solution for 40 minutes, then drain. The silk floss was then washed with a second washing solution at room temperature for 40 minutes, and then drained. Next, rinse the silk floss with room temperature water for 40 minutes, then drain.

[0045] The difference between this comparative example and Example 1 is that temperature gradient washing was not performed.

[0046] Comparative Example 7 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S2. Add chelating agent TF-1277 to deionized water and stir evenly to obtain a washing solution with a concentration of 1 g / L of chelating agent TF-1277. Take out the silk floss and wash the degummed silk floss with warm water at 40℃ for 40 minutes, then drain. The silk floss was then washed with a detergent solution at 60°C for 40 minutes, and then drained. Next, rinse the silk floss with room temperature water for 40 minutes, then drain.

[0047] The difference between this comparative example and Example 1 is that no nonionic surfactant was added during the first washing process.

[0048] Comparative Example 8 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S2. Add nonionic surfactant TF-1201 to deionized water and stir until homogeneous to obtain a washing solution with a concentration of nonionic surfactant TF-1201 of 3 g / L. Remove the silk floss and wash the degummed silk floss with a washing solution at 40℃ for 40 minutes, then drain. The silk floss was then washed with hot water at 60℃ for 40 minutes, and then drained. Next, rinse the silk floss with room temperature water for 40 minutes, then drain. The difference between this comparative example and Example 1 is that no chelating agent was added during the second washing process.

[0049] Comparative Example 9 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S2. Add nonionic surfactant TF-1201 and chelating agent TF-1277 to deionized water, stir evenly, and obtain a washing solution with a concentration of nonionic surfactant TF-1201 of 3 g / L and a concentration of chelating agent TF-1277 of 1 g / L. Remove the silk floss and wash the degummed silk floss with a washing solution at 40℃ for 40 minutes, then drain. Next, rinse the silk floss with room temperature water for 40 minutes, then drain.

[0050] The difference between this comparative example and Example 1 is that step-by-step washing was not performed.

[0051] Comparative Example 10 Except for the following conditions, the silk floss was treated in the same manner as in Example 1: S4. Add plant-derived fabric softener TF-6102 (formaldehyde-free) to deionized water and stir well to obtain a finishing solution with a concentration of 3g / L of plant-derived fabric softener TF-6102; The silk floss treated in step S2 was placed in a finishing solution for post-finishing, with a liquor ratio of 1:10. Then, the silk floss was placed in an oven and dried at 70°C until dry. The difference between this comparative example and Example 1 is that the pH was not adjusted to 6.5 after step S2. test The cleanliness of the silk floss treated in each example and comparative example was tested according to "FZ / T 41003-2010 Silkworm Wool Balls", and the results are shown in Table 1. The residual oil content (i.e., oil content) of the silk floss after treatment in each example and comparative example was tested according to GB / T 24252-2019 Silk Quilt. The results are shown in Table 1. The pH values ​​of the silk floss treated in each example and comparative example were tested using a pH meter, and the results are shown in Table 1. The content of fluorescent whitening agents in the silk floss treated in each example and comparative example was tested according to "FZ / T 01137-2016 Determination of fluorescent whitening agents in textiles". The results are shown in Table 1.

[0052] Table 1 Test Results

[0053] As shown in Table 1, the cleanliness of the silk floss treated in Example 1 reached 88 points, with a residual oil rate of less than 1%, a pH value of 6.8, and no fluorescent whitening agent was detected. These results demonstrate that this application can deeply remove impurities and reduce allergens while maintaining the natural skin-friendly properties of silk.

[0054] The above embodiments are merely illustrative of the principles and effects of this application and are not intended to limit this application. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this application. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this application should still be covered by the claims of this application.

Claims

1. A safe processing technology for silk floss, characterized in that, The safe processing technology for the silk floss includes the following steps: S1. The silk floss to be treated is immersed in a pretreatment solution containing biological enzymes with a pH of 7.5-8.0 for degumming, wherein the biological enzymes include alkaline pectinase and alkaline protease; S2. The degummed silk floss is washed with a first washing solution containing a nonionic surfactant at a temperature of 35℃-45℃, and then the silk floss is washed with a second washing solution containing a chelating agent at a temperature of 55℃-65℃, followed by rinsing the silk floss. S3. After rinsing and dehydrating the silk floss, adjust the pH to 6.5-7.0 using organic acid; S4. The silk floss treated in step S3 is placed in a finishing solution containing a plant-derived softener for post-finishing and then dried.

2. The safe processing technology for silk floss as described in claim 1, characterized in that, In the pretreatment solution described in step S1, the concentration of the biological enzyme is 2 g / L-4 g / L; And / or, in step S1, the mass ratio of alkaline pectinase to alkaline protease is 0.5-1.5:1.5-2.

5.

3. The safe processing technology for silk floss as described in claim 1 or 2, characterized in that, In step S1, the temperature of the pretreatment liquid is 50℃-60℃; And / or, in the degumming process described in step S1, the liquor ratio is 1:25-35.

4. The safe processing technology for silk floss as described in claim 1, characterized in that, In step S2, the concentration of the nonionic surfactant in the first washing solution is 2 g / L-4 g / L; And / or, in step S2, the nonionic surfactant includes dodecylamine polyoxyethylene ether.

5. The safe processing technology for silk floss as described in claim 1, characterized in that, In step S2, the concentration of the chelating agent in the second washing solution is 0.5 g / L-1.5 g / L.

6. The safe processing technology for silk floss as described in claim 1, characterized in that, In step S3, the organic acid includes citric acid and / or acetic acid.

7. The safe processing technology for silk floss as described in claim 1, characterized in that, In the finishing solution described in step S4, the concentration of the plant-derived softener is 2 g / L-4 g / L.

8. The safe processing technology for silk floss as described in claim 1 or 7, characterized in that, In the post-treatment process described in step S4, the liquor ratio is 1:8-15.

9. The safe processing technology for silk floss as described in claim 1 or 7, characterized in that, In step S4, the drying includes baking and / or air drying.

10. The safe processing technology for silk floss as described in claim 9, characterized in that, The drying temperature in step S4 is less than 80°C.

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