A method for finishing wool fabric with thiol-modified sericin

Abstract

The application discloses a method for finishing wool fabric by using thiol-modified sericin, and belongs to the technical field of functional finishing of high polymer textile materials. The application solves the problems of the existing anti-pilling finishing technology of wool fabric, such as the decline of fabric performance, poor durability of anti-pilling effect, complex finishing process, environmental pollution and the like. In the application, an activator and a modifying agent are used to modify the thiol of sericin, so that the side chain of sericin carries active thiol; the thiol is used to break the disulfide bond in wool keratin, so as to promote the moderate loosening of the scale layer of wool, and meanwhile, the amino group, the carboxyl group and other active groups on the sericin molecule are used to form stable covalent bonding with wool macromolecules, so that the modified sericin is adsorbed and fixed on the surface of wool fibers and the gap between scales, and a protective film is formed; finally, a thiol-modified sericin / hydrogen peroxide composite solution is used for spraying oxidation, so as to stabilize the structure of wool fibers. The application realizes the improvement of the anti-pilling performance of wool fabric.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of functional finishing of high polymer textile materials, and particularly relates to a method for finishing wool fabric with mercapto-modified sericin. BACKGROUND

[0002] Wool fibers have a crimped morphology, and the main component keratin molecules contain a large number of hydrophilic groups, which endow wool with good natural warmth and moisture absorption performance. At the same time, the scale structure of wool fibers also makes wool fabric have excellent air and moisture permeability, making it comfortable to wear and good in warmth retention. However, wool knitted fabric is prone to pilling during use, which not only seriously affects the appearance and hand feeling of the fabric, but also shortens its service life. Most of the current anti-pilling finishing technologies generally rely on high-temperature water and chemicals, which seriously damage the internal structure of wool fibers, and also have environmental problems of producing polluted wastewater or absorbing toxic gases.

[0003] The existing anti-pilling finishing technologies for wool fabric mainly include subtractive finishing, additive finishing and composite finishing. Subtractive finishing achieves the purpose of anti-pilling by removing the fibers prone to pilling on the surface of the fabric or destroying the scale structure of the fibers, such as protease biological polishing, chlorination method and ultraviolet oxidation method, etc. Although these methods have certain anti-pilling effect, they are easy to damage wool fibers, resulting in poor wear performance such as hand feeling and strength of wool fabric. Additive finishing mainly relies on the attachment of chemicals or the formation of a film on the surface of wool fibers to enhance the interaction between fibers and prevent fiber slippage and pilling, such as acrylic resin finishing method, modified polysilicic acid finishing method, etc. However, such methods often make the fabric feel hard, increase the finishing cost and have poor washability. Composite finishing technology combines subtractive and additive processes to strengthen the anti-pilling effect of wool. Common methods include chlorination-resin method, reduction-resin method, etc. Compared with single technology, the composite finishing technology has outstanding and durable anti-pilling effect, and can balance the defects of single technology to a certain extent. However, it has the problems of complex process flow, low processing efficiency, multiple types of chemical agents, high environmental treatment cost, difficult parameter control, and easy to cause the fabric hand feeling and strength to deteriorate due to the failure of a step. SUMMARY

[0004] The present application provides a method for finishing wool fabric with mercapto-modified sericin to solve the problems of performance deterioration of the fabric, easy damage to the soft hand feeling and warmth retention performance of wool, poor durability of anti-pilling effect, complex finishing process, environmental pollution, etc.

[0005] The technical scheme of the present application is as follows:

[0006] One of the purposes of the present application is to provide a method for finishing wool fabric with mercapto-modified sericin, which comprises the following steps:

[0007] (1) Preparation of thiolated sericin: sericin solution is activated by 1-ethyl-3(3-dimethylaminopropyl) carbodiimide hydrochloride and N-hydroxysuccinimide, and then the pH is adjusted to 4.6-4.8 by hydrochloric acid. Then, cysteamine hydrochloride is added to obtain a reaction solution. The reaction solution is reacted under light protection at constant temperature. The reacted solution is dialyzed under light protection, and then freeze-dried to obtain thiolated sericin;

[0008] (2) Thiolated sericin finishing of wool fabric: thiolated sericin is dissolved in a phosphate buffer solution to obtain a thiolated sericin solution. The pH of the solution is adjusted to 7.5-8.5. The pretreated wool fabric is immersed in the thiolated sericin solution with adjusted pH, and reacted under light protection at constant temperature with constant temperature oscillation to obtain a wool fabric with loosened and smoothed surface scales;

[0009] (3) Post-treatment: the wool fabric after oscillation treatment is washed and dried. The wool fabric is treated by spraying a composite solution composed of thiolated sericin and hydrogen peroxide to stabilize the structure of the wool fiber. Then, the wool fabric is placed under light protection and naturally dried to obtain a wool fabric with anti-pilling function.

[0010] Further limitation, in step (1), the sericin solution is prepared from a commercially available pure sericin powder with a molecular weight of 10-30 kDa. Alternatively, the solution can be obtained by degumming and purifying Bombyx mori silk or silkworm cocoons with high-temperature pure water.

[0011] Further limitation, in step (1), the effective concentration of the sericin solution is 10-100 mg / mL. The mass of the activator 1-ethyl-3(3-dimethylaminopropyl) carbodiimide hydrochloride is 20-30% of the mass of the sericin. The mass of the activator N-hydroxysuccinimide is 15-20% of the mass of the sericin.

[0012] Further limitation, in step (1), the concentration of hydrochloric acid is 1.0 mol / L.

[0013] Further limitation, in step (1), the concentration ratio of cysteamine hydrochloride to sericin in the reaction solution is (3-10):100.

[0014] Further limitation, in step (1), the reaction temperature is 0-4 ℃, and the reaction time is 8-12 h. The reaction is carried out under low-speed stirring at a speed of 20-30 r / min.

[0015] Further limitation, in step (1), the unreacted cysteamine hydrochloride is removed by dialysis. Deionized water with a pH of 3.5-4 is used in the dialysis process. The dialysis temperature is 0-4 ℃, and the dialysis time is 72 h.

[0016] Further limited, the freezing temperature in step (1) is -40~ -20 ℃, and the freeze-drying time is 36~48 h.

[0017] Further limited, the thiol content of the thiolated sericin obtained in step (1) is not less than 300 mmol / g.

[0018] Further limited, the pretreatment process in step (2) is: the wool fabric is defatted, washed and dried to remove surface grease and impurities.

[0019] Further limited, the concentration of the thiolated sericin solution in step (2) is 10~200 mg / mL.

[0020] Further limited, the bath ratio of the impregnation process in step (2) is 1: (15~30), the reaction temperature is 40~50 ℃, and the time is 30 min~2 h.

[0021] Further limited, in step (3), the composite solution composed of thiolated sericin and hydrogen peroxide is prepared, and the wool fabric after anti-pilling finishing is sprayed to stabilize the structure of the wool fiber.

[0022] Further limited, the concentration of thiolated sericin in the composite solution of step (3) is 5~10 mg / mL, and the mass fraction of hydrogen peroxide is 0.1%~0.3%.

[0023] Further limited, the spraying amount of each kilogram of wool fabric during the spraying treatment of step (3) is 300~450 g, and the light-shielded standing time is 30~40 min.

[0024] The second object of the present application is to provide a wool fabric with anti-pilling performance finished by the above method.

[0025] Further limited, the pilling level of the wool fabric is ≥4 levels, and the mass loss rate is ≤5%.

[0026] The present application has the following advantages:

[0027] The present application uses thiolated sericin to finish the wool fabric, and the finishing process is simple, green and environmentally friendly, and no harmful chemical reagent residues are left, and the finished wool fabric has obvious anti-pilling effect, and the softness and warmth retention of the wool fabric are excellent.

[0028] (1) Firstly, the sericin protein is modified by thiol group, and then the sericin protein modified by thiol group is applied to anti-pilling finishing of wool fabric: the natural skin-friendly sericin protein is used as a main raw material, and a mild and non-toxic activator and a modifying agent cysteamine hydrochloride are used for thiol group modification, so that the sericin protein side chain carries active thiol groups; under mild process conditions, the thiol groups break the disulfide bonds in the wool keratin, and the thiol groups of the sericin protein and the disulfide bonds in the wool keratin molecules undergo nucleophilic substitution reaction, the reaction is stably anchored on the surface of the wool fiber, and the surface layer of the wool scale layer is loosened, and then the scale layer tends to be flat and solidified, effectively inhibiting the pilling phenomenon caused by the sliding of the wool fiber due to friction, and achieving excellent anti-pilling finishing effect. At the same time, in the post-treatment, the composite solution composed of the sericin protein modified by thiol group and hydrogen peroxide has a mild oxidation effect on the wool fabric, so that a more stable cross-linked structure is formed on the surface and inside of the wool fiber, the structure of the wool fiber is stabilized, the main structure of the wool fiber is ensured not to be damaged, and the inherent soft hand feeling and warmth retention performance of the wool fabric are maximally retained.

[0029] (2) The sericin protein used in the present application belongs to natural animal protein, is rich in source and renewable, and has low raw material acquisition cost; the sericin protein molecular structure contains a large number of active groups such as amino groups and carboxyl groups, and forms hydrogen bonds, ionic bonds and covalent bonds with wool macromolecules, so that the modified sericin protein is uniformly adsorbed and fixed on the surface of the wool fiber and the scale gap, and a flexible protective film is formed. Due to the strong interaction between the sericin protein modified by thiol group and the wool fiber, the protective film is firmly combined and not easy to fall off, which ensures the durability of the anti-pilling effect of the wool fabric.

[0030] (3) The anti-pilling finishing process of the wool fabric of the present application is simple and efficient, does not need complex production equipment, has low energy consumption in the production process and is environmentally friendly; compared with the traditional anti-pilling finishing process of wool fabric using formaldehyde-containing resins, fluorine-containing compounds and other finishing agents, there is no harmful substance residue in the finishing agent and process system used in the present application, and the wool fabric finished by the method of the present application is high in safety and will not cause adverse stimulation or side effects to the human body and skin.

[0031] (4) The present application realizes the significant improvement of the anti-pilling performance of the wool fabric through the synergistic effect of the thiol group modification of the sericin protein and the post-treatment process, and the wool fabric after finishing can maintain its inherent soft hand feeling and warmth retention performance. The finishing process of the present application is simple and efficient, green and environmentally friendly, has no toxic and harmful substance residue, and is suitable for industrial application and popularization. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The photo of the pilling test result of the wool fabric without finishing with the sericin protein modified by thiol group in Example 1;

[0033] Figure 2The pilling test result photo of the wool fabric after being finished with the thiolated sericin protein in Example 1;

[0034] Figure 3 The pilling test result photo of the wool fabric before and after being finished with the thiolated sericin protein in Example 2;

[0035] Figure 4 The pilling test result photo of the wool fabric before and after being finished with the thiolated sericin protein in Example 3;

[0036] Figure 5 The pilling test result photo of the wool fabric before and after being finished with the thiolated sericin protein in Comparative Example 1. DETAILED DESCRIPTION

[0037] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the embodiments of the present application.

[0038] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without the specific details set forth in this description. In other instances, well-known methods have not been described in detail in order to avoid obscuring the present application.

[0039] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. The "in one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is independent or alternative to other embodiments.

[0040] The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, methods and instruments used are conventional materials, reagents, methods and instruments in the art unless otherwise specified, and can be obtained by commercial channels by those skilled in the art.

[0041] Example 1

[0042] A method for finishing wool fabric with thiolated modified sericin protein

[0043] (I) Preparation of thiolated sericin protein

[0044] (1) Cut the silkworm cocoon into pieces, wash with room temperature deionized water and dry, add the dried clean silkworm cocoon to boiling deionized water with a bath ratio of 1:20, boil for 1 h, dry to room temperature, and filter out the cocoon residue with gauze to obtain a pure sericin protein solution, which is concentrated to 100 mg / mL at 60 ℃;

[0045] (2) To the concentrated sericin solution 100 mL, add the activator 1-ethyl-3 (3-dimethylaminopropyl) carbodiimide hydrochloride, then add the activator N-hydroxysuccinimide, adjust the pH of the solution to 4.6 with 1.0 mol / L hydrochloric acid (the amount of hydrochloric acid used is very small, almost does not affect the reaction liquid volume, so it will not affect the final concentration of each substance in the reaction liquid), add cysteamine hydrochloride, and obtain the reaction liquid, which is stirred at 4 ℃ and 30 r / min in the dark for 12 h, the final concentration of 1-ethyl-3 (3-dimethylaminopropyl) carbodiimide hydrochloride in the reaction liquid is 20 mg / mL, the final concentration of N-hydroxysuccinimide is 15 mg / mL, and the final concentration of cysteamine hydrochloride is 10 mg / mL;

[0046] (3) The reacted solution is dialyzed in deionized water at pH 4 and 4 ℃ in the dark for 72 h, and the deionized water is replaced every 3 h, after dialysis, the solution is frozen in a refrigerator at -40 ℃ for 12 h, and then freeze-dried at -80 ℃ for 48 h to obtain the thiolated sericin, the content of thiol in the sericin is determined by the Ellman method to be 717 μmol / g;

[0047] (II) Thiolated sericin finishing of wool fabric

[0048] (1) The wool fabric with a grammage of 220 g / m 2 is immersed in a 2% sodium dodecyl sulfate solution, and treated at 60 ℃ for 30 min, then the wool fabric is washed with deionized water to pH 7-8 (neutral) and dried at 50 ℃, completing the pretreatment process of degreasing, washing and drying of the wool fabric, and there is no strict restriction on the bath ratio, as long as the wool fabric can be completely immersed;

[0049] (2) The thiolated sericin is dissolved in a phosphate buffer solution at pH 7.4 to prepare a solution with a concentration of 200 mg / mL, and the thiolated sericin solution is obtained, and the pH of the solution is adjusted to 8.5;

[0050] (3) The dried wool fabric in (1) is completely immersed in the thiolated sericin solution at pH 8.5, the bath ratio is 1:30, and the wool fabric is reacted in the dark at 50 ℃ for 2 h, then the wool fabric is washed with deionized water for 3 times, and dried at 50 ℃;

[0051] (III) Post-treatment

[0052] A thiolated sericin / hydrogen peroxide complex solution is prepared, wherein the concentration of thiolated sericin in the complex solution is 10 mg / mL, the mass fraction of hydrogen peroxide is 0.3%, and the impregnated wool fabric in step (two) is uniformly sprayed at a spraying amount of 450 g per kilogram of wool fabric. The sprayed wool fabric is placed in the dark for 40 min, and finally the wool fabric treated with thiolated sericin is obtained.

[0053] The dry mass of the wool fabric before and after the finishing of the present embodiment is determined. The dry mass before finishing refers to the mass after drying in step (1) of the process of finishing the wool fabric with thiolated sericin. The calculated mass loss rate of the fabric is 4.39%. The wool fabric without finishing and the wool fabric obtained in the present embodiment are subjected to the pilling test, and the test standard refers to GB / T 4802.1-2008 "Determination of the Pilling Behavior of Textile - Part 1: Circular Track Method". The test parameters of E method are used: pressure 780 cN, pilling times 600, and the test results are shown in Figure 1 、 Figure 2 and Table 1.

[0054] Table 1: Pilling grade of wool fabric before and after finishing in the present embodiment

[0055]

[0056] From Figure 1 、 Figure 2 and Table 1, it can be seen that the wool fabric without finishing has serious pilling, and the pilling grade is 2; the pilling grade of the finished wool fabric can reach 5, and there is no obvious pilling phenomenon on the surface of the fabric, indicating that the method of the present embodiment can significantly improve the anti-pilling performance of the wool fabric.

[0057] The thermal resistance and heat retention rate of the wool fabric before and after finishing are determined by the evaporation hot plate method (referring to GB / T 11048-2018). The wool fabric before finishing refers to the wool fabric after drying in step (1) of the process of finishing the wool fabric with thiolated sericin. The thermal resistance of the wool fabric without finishing is 68.4 x 10 -3 m 2 ·k / w, and the heat retention rate is 57%; the thermal resistance of the wool fabric finished with thiolated sericin is 59.8 x 10 -3 m 2 ·k / w, and the heat retention rate is 53%, which has no obvious change and still maintains good heat retention.

[0058] The bending stiffness of the wool fabric before and after finishing was determined according to the national standard GB / T 18318.1-2009 "Textiles - Determination of bending properties - Part 1: inclined method". The wool fabric before finishing refers to the wool fabric after drying in step (1) of the process of finishing the wool fabric with sulfhydrylated sericin. The bending stiffness of the unfinishing wool fabric is 0.12 mN·cm / cm, and the hand is soft. The bending stiffness of the wool fabric after finishing with sulfhydrylated sericin is 0.17 mN·cm / cm, and the hand is still soft.

[0059] Example 2

[0060] The differences between this example and Example 1 are as follows: (1) in the preparation process of sulfhydrylated sericin, (1) 99% pure silk fibroin powder with a molecular weight of 10 kDa was dissolved in deionized water to prepare a silk fibroin solution with a concentration of 100 mg / mL, (2) the final concentration of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride in the reaction solution was 30 mg / mL, the final concentration of N-hydroxysuccinimide was 20 mg / mL, the pH of the solution was adjusted to 4.8, and the final concentration of cysteamine hydrochloride was 3 mg / mL; (2) in the process of finishing the wool fabric with sulfhydrylated sericin, a sulfhydrylated sericin solution with a concentration of 150 mg / mL was prepared, the pH of the solution was adjusted to 8.0, (3) the bath ratio was 1:20, and the reaction was carried out at 40°C for 2 h in the dark; (3) in the post-treatment process, the mass fraction of hydrogen peroxide was 0.2%, the spraying amount per kilogram of wool fabric was 400 g, and the rest of the process steps and parameter settings were the same as those of Example 1.

[0061] The sulfhydrylated sericin obtained in step (1) was determined by Ellman method, and the content of sulfhydryl was 652 μmol / g. The dry mass of the wool fabric before and after finishing in this example was determined, and the mass loss rate of the fabric was calculated to be 4.22%. The wool fabric before finishing and the wool fabric obtained in this example were tested for pilling, and the test standard was referred to GB / T 4802.1-2008 "Textiles - Determination of the pilling behavior of textiles - Part 1: circular track method". The test parameters of E method were used: pressure 780 cN, pilling times 600, and the test results are shown in Table 1 and Table 2. Figure 3 and Table 2.

[0062] Table 2 Pilling grade of wool fabric before and after finishing in this example

[0063]

[0064] From Figure 3As can be seen from Table 2, the unprocessed wool fabric has serious pilling, and the pilling grade is 2; the pilling grade of the processed wool fabric can reach 5, and there is no obvious pilling phenomenon on the surface of the fabric, indicating that the method of this embodiment can significantly improve the anti-pilling performance of the wool fabric.

[0065] The thermal resistance and heat retention rate of the wool fabric before and after processing were determined by the evaporation hot plate method (reference GB / T 11048-2018). The wool fabric before processing refers to the wool fabric after drying in step (1) of the process of processing the wool fabric with mercapto sericin. The thermal resistance of the unprocessed wool fabric is 68.4 x 10 -3 m 2 ·k / w, and the heat retention rate is 57%; the thermal resistance of the wool fabric after processing with mercapto sericin is 61.6 x 10 -3 m 2 ·k / w, and the heat retention rate is 55%, which has no obvious change and still maintains good heat retention.

[0066] According to the national standard GB / T 18318.1-2009 "Determination of bending properties of textiles Part 1: Inclined plane method", the bending stiffness of the wool fabric before and after processing was determined. The wool fabric before processing refers to the wool fabric after drying in step (1) of the process of processing the wool fabric with mercapto sericin. The bending stiffness of the unprocessed wool fabric is 0.12 mN·cm / cm, and the hand feeling is soft; the bending stiffness of the wool fabric after processing with mercapto sericin is 0.15 mN·cm / cm, and the hand feeling is still soft.

[0067] Example 3

[0068] The difference between this embodiment and embodiment 2 is that: (1) the molecular weight of the silk fibroin powder in the preparation process of the thiolated sericin is 30 kDa, and the concentration of the sericin solution is 10 mg / mL; (2) in the reaction solution, the final concentration of 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride is 3 mg / mL, the final concentration of N-hydroxysuccinimide is 2 mg / mL, the pH of the solution is adjusted to 4.6, the final concentration of cysteamine hydrochloride is 1 mg / mL, the rotation speed is 30 r / min, and the reaction time is 8 h; (3) the dialysis pH is 3.5 and the dialysis temperature is 0℃, and the dialysis is carried out in a refrigerator at -20℃ for 12 h, followed by freeze-drying for 36 h; (2) in the process of finishing the wool fabric with the thiolated sericin, the thiolated sericin solution with a concentration of 10 mg / mL is prepared, and the pH of the solution is adjusted to 7.5; (3) the bath ratio is 1:15, and the reaction is carried out in the dark for 1 h; (3) in the post-treatment process, the concentration of the thiolated sericin is 5 mg / mL, the mass fraction of hydrogen peroxide is 0.1%, the spraying amount of per kilogram of wool fabric is 300 g, and the wool fabric is placed in the dark for 30 min; and the rest of the process steps and parameters are the same as those of embodiment 2.

[0069] The thiolated sericin obtained in step (1) is determined by the Ellman method, and the content of thiol is 339 μmol / g. The dry mass of the wool fabric before and after finishing is determined, and the mass loss rate of the fabric is calculated to be 2.89%. The wool fabric without finishing and the wool fabric obtained in this embodiment are subjected to pilling test, and the test standard refers to GB / T 4802.1-2008 “Determination of the Pilling Behavior of Textile - Part 1: Circular Track Method”. The test parameters of E method are used: pressure 780 cN, pilling times 600, and the test results are shown in Figure 4 and Table 3.

[0070] Table 3 Pilling grade of the wool fabric before and after finishing in this embodiment

[0071]

[0072] From Figure 4 and Table 3, it can be seen that the wool fabric without finishing has serious pilling, and the pilling grade is 2; the pilling grade of the finished wool fabric can reach 4, and the fabric surface only has slight pilling, indicating that the method of this embodiment can significantly improve the anti-pilling performance of the wool fabric.

[0073] The thermal resistance and heat retention rate of the wool fabric before and after finishing are determined by the evaporation hot plate method (referring to GB / T 11048-2018), and the wool fabric before finishing refers to the wool fabric after drying in step (1) of the process of finishing the wool fabric with the thiolated sericin. The thermal resistance value of the wool fabric without finishing is 68.4×10 -3 m2 · k / w, the heat retention rate is 57%; the thermal resistance value of the wool fabric after being finished by the mercerized sericin is 64.3 x 10 -3 m 2 · k / w, the heat retention rate is 56%, and there is no obvious change, and the heat retention is still good.

[0074] According to the national standard GB / T 18318.1-2009 "Determination of the bending properties of textiles Part 1: Inclined plane method", the bending stiffness of the wool fabric before and after finishing is determined. The wool fabric before finishing refers to the wool fabric after drying in step (1) of the process of finishing the wool fabric by mercerized sericin. The bending stiffness of the wool fabric without finishing is 0.12 mN·cm / cm, and the hand is soft; the bending stiffness of the wool fabric after being finished by mercerized sericin is 0.14 mN·cm / cm, and the hand is still soft.

[0075] Comparative Example 1

[0076] The difference between this comparative example and Example 1 is that: (two) preparing a mercerized sericin solution with a concentration of 5 mg / mL in the process of finishing the wool fabric by mercerized sericin; (three) the concentration of mercerized sericin is 15 mg / mL, and the mass fraction of hydrogen peroxide is 0.4% in the post-treatment process, and the rest of the process steps and parameter settings are the same as Example 1.

[0077] The wool fabric without finishing and the wool fabric obtained in this example were subjected to pilling test, and the test standard referred to GB / T 4802.1-2008 "Determination of the pilling behavior of textiles Part 1: Circular track method", and the test parameters of E method were used: pressure 780 cN, pilling times 600, and the test results are shown in Figure 5 and Table 4.

[0078] Table 4 Pilling grade of wool fabric before and after finishing in this comparative example

[0079]

[0080] From Figure 5 and Table 4, it can be seen that the wool fabric without finishing has serious pilling, and the pilling grade is 2; the pilling grade of the wool fabric after finishing is still 2, and the pilling on the surface of the fabric is obvious, which indicates that the method of this comparative example cannot significantly improve the anti-pilling performance of the wool fabric.

[0081] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A method of finishing wool fabric with thiolated modified sericin, characterized by, The method includes the following steps: (1) Preparation of thiolized sericin: The sericin solution was activated with an activator, and the pH was adjusted to 4.6-4.8 with hydrochloric acid. Cysteine ​​hydrochloride was added to obtain a reaction solution. The reaction was carried out in the dark at a constant temperature. The solution after the reaction was dialyzed in the dark and freeze-dried to obtain thiolized sericin. (2) Thiolized sericin treatment of wool fabrics: Thiolized sericin is dissolved in phosphate buffer solution to obtain thiolated sericin solution. The pH of the solution is adjusted to 7.5~8.

5. The pretreated wool fabric is immersed in the pH adjusted thiolated sericin solution and reacted in the dark at a constant temperature with shaking. (3) Post-treatment: The wool fabric after oscillation treatment is washed and dried, sprayed with a composite solution composed of mercapto-based sericin and hydrogen peroxide, and then left to stand in the dark and air-dried to obtain a wool fabric with anti-pilling function. The pretreatment process in step (2) is as follows: the wool fabric is degreased, washed and dried to remove surface grease and impurities; the concentration of the mercapto-modified sericin solution is 10~200 mg / mL; The concentration of thiolized sericin in the composite solution of step (3) is 5~10 mg / mL, and the mass fraction of hydrogen peroxide is 0.1%~0.3%.

2. The method of claim 1, wherein, In step (1), the concentration of the sericin solution is 10~100 mg / mL, the concentration of hydrochloric acid is 1.0 mol / L, and the concentration ratio of cysteine ​​hydrochloride to sericin is (3~10):

100.

3. The method of claim 1, wherein, In step (1), the reaction temperature is 0~4 ℃ and the time is 8~12h; the dialysis process uses deionized water with pH 3.5~4, the dialysis temperature is 0~4 ℃ and the time is 72h.

4. The method of claim 1, wherein, In step (1), the freezing temperature is -40 to -20 ℃ and the freeze-drying time is 36 to 48 h; the thiol content of thiolized sericin is not less than 300 μmol / g.

5. The method according to claim 1, characterized in that, In step (2), the bath ratio of the impregnation process is 1: (15~30), the reaction temperature is 40~50 ℃, and the time is 30 min~2 h.

6. The method according to claim 1, characterized in that, In step (3), the amount of spray per kilogram of wool fabric is 300-450 g, and the time for standing in the dark is 30-40 min.

7. A wool fabric with anti-pilling properties obtained by the method according to any one of claims 1-6.

8. The wool fabric according to claim 7, characterized in that, The pilling grade of wool fabrics is ≥4, and the quality loss rate is ≤5%.

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