Degumming method based on mulberry silk fabric

Abstract

The invention relates to the field of spinning, and discloses a degumming method based on mulberry silk fabric, which comprises the following steps: S1, presoaking treatment: placing a hydrochloric acid solution in a reaction container at normal temperature, then completely soaking the mulberry silk fabric in the hydrochloric acid solution for soaking, and starting a stirring device for slow stirring at the same time, S2, wet and hot steam degumming, s4, enzyme solution inactivation treatment, S5, ultrasonic cleaning, S6, drying and softening treatment, and S7, packaging and storage, impurities and part of sericin can be preliminarily removed through presoaking treatment, and then the sericin is further expanded through wet and hot steam degumming, so that better conditions are created for enzyme treatment, enzyme is easier to contact with the sericin and play a role, and the sericin can be more effectively removed. According to the present invention, the pre-impregnation and the wet and hot steam degumming are mild, the damage to the fiber can be furthest reduced through the combined treatment with the protease, the strength and the flexibility of the fabric can be maintained, and the overall quality effect of the fabric can be improved.

Description

Technical Field

[0001] The invention relates to the field of textiles, in particular to a degumming method based on mulberry silk fabrics. Background Art

[0002] Mulberry silk fabrics have always been favored in the textile field for their excellent quality, comfortable touch and unique luster. However, mulberry silk contains a certain amount of sericin during the reeling and weaving process. The presence of this sericin will affect the feel, luster, dyeing properties, etc. of the fabric. Therefore, effective degumming treatment of mulberry silk fabrics is a key link in improving their quality and performance. Strong acid and strong alkali solutions are usually used to directly degumming mulberry silk fabrics.

[0003] However, the current technology lacks a pre-treatment step, which results in incomplete removal of the sericin, affecting the subsequent processing and performance of the fabric and reducing the strength, feel and gloss of the fabric. Summary of the invention

[0004] In view of the deficiencies in the prior art, the present invention provides a degumming method based on mulberry silk fabrics, which solves the problem that the lack of pretreatment before degumming results in incomplete removal of sericin, affecting the strength, feel and glossiness of the fabric.

[0005] To achieve the above object, the present invention is implemented by the following technical scheme: a degumming method based on mulberry silk fabric comprises the following steps:

[0006] S1: pre-preg treatment, at room temperature, placing a hydrochloric acid solution in a reaction container, and then completely soaking the mulberry silk fabric in the hydrochloric acid solution, while turning on a stirring device to slowly stir;

[0007] S2: Hot and humid steam degumming: the pre-impregnated silk fabric is placed in a hot and humid steam environment, the pressure is adjusted by a pressure control valve, and then the fabric is sprayed with hot water;

[0008] S3: preparation and treatment of enzyme solution, dissolving alkaline protease in phosphate buffer, stirring until the protease is dissolved, then placing the mulberry silk fabric in a treatment container, pouring the alkaline protease solution, adjusting the temperature and the pH value by dilute hydrochloric acid and sodium hydroxide solution, and stirring;

[0009] S4: enzyme inactivation treatment: after the reaction is completed, the fabric is taken out and soaked in hot water to inactivate the enzyme and terminate the reaction;

[0010] S5: ultrasonic cleaning, placing the silk fabric in an ultrasonic cleaning device, adding a silk-specific laundry detergent solution, and then turning on the ultrasonic device to perform ultrasonic cleaning twice, then taking out the silk fabric, rinsing the fabric with clean water to remove the residual cleaning solution;

[0011] S6: Drying and softening treatment, spread the silk fabric flat on the drying tray and then send it to the drying room for drying;

[0012] S7: Packaging and storage. First, roll the dried silk fabric into a regular cylindrical shape, then gently fix the rolled fabric with rubber bands and ribbons, then wrap it with wrapping paper, seal the package with sealing clips, and lay it flat in a dry environment for storage.

[0013] Preferably, the concentration of the hydrochloric acid solution in S1 is 0.05-0.15 mol / L, the stirring speed is 30-50 revolutions per minute, and the immersion is carried out at a temperature of 20-25° C. for 120 minutes.

[0014] Preferably, the mulberry silk fabric described in S2 is placed in a hot and humid steam environment, the pressure is adjusted to 0.1-0.12 MPa through a pressure control valve, the mulberry silk fabric is kept in the hot and humid steam environment under the pressure for 30-40 minutes, and is sprayed with 60-80°C hot water for 6-7 minutes.

[0015] Preferably, the ratio of alkaline protease to phosphate buffer in S3 is as follows: 1-5 g of alkaline protease is dissolved in every 100 ml of phosphate buffer, the heating device adjusts the solution temperature to 30-40°C, and the pH value is adjusted by dropwise adding dilute hydrochloric acid or sodium hydroxide solution until the target pH value of 9.0-9.5 is reached, the stirring device stirs at a speed of 50-60 revolutions per minute, and the enzyme treatment is carried out for 40-50 minutes.

[0016] Preferably, the temperature of the hot water in S4 is 85-95° C., and the soaking time of the fabric is maintained at 10-15 minutes.

[0017] Preferably, the ultrasonic cleaning device in S5 is turned on at a frequency of 30-40kHz, with a power range of 20-100W / L, the first ultrasonic cleaning time is 15 minutes, a new laundry detergent solution is replaced, and the ultrasonic device is turned on for a second cleaning for 15 minutes, followed by rinsing with clean water for 3-5 minutes.

[0018] Preferably, the thickness of the silk fabric spread on the drying plate in S6 is 1-3 cm, and the drying temperature in the drying room is 50-60°C.

[0019] Preferably, the wrapping paper in S7 is made of a mixture of 70% cotton fiber and 30% hemp fiber, and the thickness of the wrapping paper is 0.1-0.3 mm, the storage temperature range is 18-25°C, the relative humidity is controlled at 50%-60%, the air circulation speed is 0.1-0.3 m / s, and the storage environment uses blackout curtains.

[0020] The present invention provides a degumming method based on mulberry silk fabric, which has the following beneficial effects:

[0021] 1. The present invention can preliminarily remove impurities and part of sericin through pre-impregnation treatment, and then further expand the sericin through wet hot steam degumming, thereby creating better conditions for enzyme treatment, making it easier for the enzyme to contact with the sericin and take effect, thereby significantly improving the overall degumming efficiency. Pre-impregnation and wet hot steam degumming are relatively mild, and the combined treatment with protease can minimize damage to the fiber, maintain the strength and flexibility of the fabric, and thus improve the overall quality of the fabric.

[0022] 2. The present invention inactivates the enzyme and terminates the reaction by taking out the enzyme-treated fabric and soaking it in hot water, thereby ensuring that the enzymatic reaction stops at the desired stage, avoiding excessive decomposition or damage of the enzyme to the mulberry silk fiber, maintaining the strength and integrity of the fiber, and avoiding the potential impact of the enzyme during subsequent storage or use, thereby achieving the effect of maintaining stable fabric quality and consistency of fabric quality.

[0023] 3. The present invention uses ultrasonic cleaning to combine with laundry detergent solution to penetrate deep into the fiber and effectively remove various stubborn stains, including sweat stains, grease and fine impurities. At the same time, it can clean the residual enzyme solution on the mulberry silk fabric, ensuring that all parts of the fabric are fully and evenly cleaned, avoiding the effects of discoloration, hardening or skin irritation that may be caused by detergent residues on the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a flow chart of a degumming method for mulberry silk fabric; DETAILED DESCRIPTION

[0025] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Please refer to the attached Figure 1 The embodiment of the present invention provides a degumming method based on mulberry silk fabric, comprising the following steps:

[0027] S1: pre-preg treatment, at room temperature, placing a hydrochloric acid solution in a reaction container, and then completely soaking the mulberry silk fabric in the hydrochloric acid solution, while turning on a stirring device to slowly stir;

[0028] S2: Hot and humid steam degumming: the pre-impregnated silk fabric is placed in a hot and humid steam environment, the pressure is adjusted by a pressure control valve, and then the fabric is sprayed with hot water;

[0029] S3: preparation and treatment of enzyme solution, dissolving alkaline protease in phosphate buffer, stirring until the protease is dissolved, then placing the mulberry silk fabric in a treatment container, pouring the alkaline protease solution, adjusting the temperature and the pH value by dilute hydrochloric acid and sodium hydroxide solution, and stirring;

[0030] S4: enzyme inactivation treatment: after the reaction is completed, the fabric is taken out and soaked in hot water to inactivate the enzyme and terminate the reaction;

[0031] S5: ultrasonic cleaning, placing the silk fabric in an ultrasonic cleaning device, adding a silk-specific laundry detergent solution, and then turning on the ultrasonic device to perform ultrasonic cleaning twice, then taking out the silk fabric, rinsing the fabric with clean water to remove the residual cleaning solution;

[0032] S6: Drying and softening treatment, spread the silk fabric flat on the drying tray and then send it to the drying room for drying;

[0033] S7: Packaging and storage. First, roll the dried silk fabric into a regular cylindrical shape, then gently fix the rolled fabric with rubber bands and ribbons, then wrap it with wrapping paper, seal the package with sealing clips, and lay it flat in a dry environment for storage.

[0034] The concentration of the hydrochloric acid solution in S1 is 0.05-0.15 mol / L, the stirring speed is 30-50 revolutions per minute, and the temperature is maintained at 20-25°C for immersion for 120 minutes.

[0035] Specifically, hydrochloric acid can destroy the molecular structure of sericin and dissolve it in the solution, thereby achieving the purpose of partial degumming. At the same time, stirring can make the fabric fully contact with the hydrochloric acid solution, accelerate the dissolution and removal of sericin, and soak the mulberry silk fabric at room temperature of 20-25℃ for 120 minutes, which reduces the fiber damage and performance changes caused by too high or too low temperature, and provides enough time for the hydrochloric acid solution to fully react with the sericin, which helps to maintain the stability of the physical and chemical properties of the mulberry silk fabric.

[0036] In S2, the silk fabric is placed in a hot and humid steam environment, and the pressure is adjusted to 0.1-0.12 MPa through a pressure control valve. The silk fabric is kept in the hot and humid steam environment under the pressure for 30-40 minutes, and is sprayed with hot water at 60-80°C for 6-7 minutes.

[0037] Specifically, under the action of pressure regulated by the pressure control valve, the hot and humid steam can penetrate more deeply into the fibers of the mulberry silk fabric, enhance the degumming effect, and promote the softening and dissolution of the sericin, while the hot water spray can rinse off the softened and partially dissolved sericin, as well as impurities on the surface of the fabric, thereby improving the cleanliness of the fabric.

[0038] The ratio of alkaline protease to phosphate buffer in S3 is as follows: 1-5 g of alkaline protease is dissolved in every 100 ml of phosphate buffer. The heating device adjusts the solution temperature to 30-40°C, and the pH value is adjusted by dropwise adding dilute hydrochloric acid or sodium hydroxide solution until the target pH value of 9.0-9.5 is reached. The stirring device stirs at a speed of 50-60 revolutions per minute, and the enzyme treatment is carried out for 40-50 minutes.

[0039] Specifically, alkaline protease can specifically decompose sericin while having little effect on fibroin, the main component of mulberry silk, which helps to retain the excellent properties of mulberry silk to the greatest extent while removing sericin, and can also improve the softness, glossiness and feel of mulberry silk fabrics. The temperature and pH conditions for alkaline protease to exert its best activity can be achieved by using dilute hydrochloric acid or sodium hydroxide solution, so that the enzyme can exert its maximum degumming effect in the most suitable environment, thereby improving the quality and consistency of the degumming effect. Stirring helps to promote the contact and reaction between the enzyme and sericin, shorten the processing time, and reduce the amount of enzyme used.

[0040] The temperature of hot water in S4 is 85-95°C, and the soaking time of the fabric is maintained at 10-15 minutes.

[0041] Specifically, adding hot water at a temperature of 85-95°C can quickly make the alkaline protease lose its catalytic ability and terminate its further action on the fabric, which helps to accurately control the degree of degumming and avoid excessive treatment that leads to deterioration of fabric quality. Washing away the residual enzyme solution can also effectively reduce the number of microorganisms on the fabric surface. It also helps to remove possible residual impurities and pollutants, making the fabric cleaner.

[0042] The start-up frequency of the ultrasonic cleaning equipment in S5 is 30-40kHz, the power range is 20-100W / L, the first ultrasonic cleaning time is 15 minutes, the new laundry detergent solution is replaced, and the ultrasonic equipment is turned on for the second cleaning, the time is 15 minutes, and then rinsed with clean water for 3-5 minutes.

[0043] Specifically, laundry detergent can preliminarily decompose and remove stains and impurities on the surface of the fabric. After that, the ultrasonic cleaning equipment can use the cavitation, acceleration and straight-forward flow effects of ultrasonic waves in the liquid to produce strong impact and vibration between the liquid and the fabric, which can effectively remove deep stains and residual sericin and enhance the cleaning effect. Two ultrasonic cleanings can further improve the cleanliness and ensure that the fabric is fully cleaned. After that, the fabric is rinsed with clean water to take away the residual laundry detergent and the cleaned stains, and avoid the laundry detergent remaining on the fabric, which may cause the fabric to harden, discolor or affect the feel; make the fabric cleaner and maintain its soft and comfortable characteristics.

[0044] In S6, the thickness of the silk fabric spread on the drying plate is 1-3 cm, and the drying temperature in the drying room is 50-60°C.

[0045] Specifically, spreading the fabric flat can make all parts of the fabric evenly exposed to the drying environment. When receiving the same degree of heat and airflow in the drying room, it can ensure the consistency of drying and avoid local over-drying or under-drying. At the same time, it helps to maintain the original shape and size of the fabric, reduce deformation and wrinkles caused by folding or stacking, and increase the contact area between the fabric and the air, accelerate the evaporation of moisture, and improve drying efficiency.

[0046] The wrapping paper in S7 is made of a mixture of 70% cotton fiber and 30% hemp fiber, and the thickness of the wrapping paper is 0.1-0.3 mm. The storage temperature range is 18-25°C, the relative humidity is controlled at 50%-60%, the air circulation speed is 0.1-0.3 m / s, and the storage environment uses blackout curtains.

[0047] Specifically, the regular cylindrical shape is convenient for compact storage and can effectively utilize the storage space, and the cotton fiber in the wrapping paper has good softness, making the wrapping paper soft to the touch and not easy to scratch or wear the fabric when in contact with the mulberry silk fabric. The addition of hemp fiber enhances the strength and toughness of the wrapping paper, making it more durable and able to withstand a certain tension and pressure, and not easy to break during the packaging and storage process, thereby ensuring the good air permeability and moisture absorption of the mulberry silk fabric packaging, and using blackout curtains to avoid direct sunlight to slow down the aging process of the fiber and extend the service life of the fabric.

[0048] The following is an introduction in conjunction with specific embodiments:

[0049] Embodiment 1

[0050] The concentration of the hydrochloric acid solution in which the mulberry silk fabric is immersed in S1 is 0.05 mol / L, the stirring speed is 30 revolutions per minute, the temperature is controlled at 20° C., and the immersion time is 120 minutes.

[0051] The pressure in the hot and humid steam environment in S2 was adjusted to 0.1 MPa, maintained for 30 minutes, the temperature of the spraying hot water was 60°C, and the spraying time was 6 minutes.

[0052] The ratio of alkaline protease to phosphate buffer in S3 is 1 gram of alkaline protease dissolved in 100 ml of phosphate buffer, the temperature of the heating device is 30° C., the pH value is controlled at 9, the stirring speed is 50 revolutions per minute, and the enzyme treatment time is 40 minutes.

[0053] The hot water temperature in S4 is 85°C and the soaking time is 10 minutes.

[0054] The start frequency of the ultrasonic cleaning equipment in S5 is 30kHz, the power range is 20W / L, and the first ultrasonic cleaning and the second ultrasonic cleaning time are both 15 minutes, during which new laundry detergent solution needs to be replaced, followed by rinsing with clean water for 3 minutes.

[0055] The thickness of the silk fabric in S6 when spread on the drying tray was 1 cm, and the drying temperature was 50°C.

[0056] The thickness of the wrapping paper in S7 is 0.1 mm, the storage temperature range is 18°C, the relative humidity is controlled at 50%, and the air circulation speed is 0.1 m / s.

[0057] Embodiment 2

[0058] The concentration of the hydrochloric acid solution in which the mulberry silk fabric is immersed in S1 is 0.05 mol / L, the stirring speed is 30 revolutions per minute, the temperature is controlled at 20° C., and the immersion time is 120 minutes.

[0059] The pressure in the hot and humid steam environment in S2 was adjusted to 0.1 MPa, maintained for 30 minutes, the temperature of the spraying hot water was 60°C, and the spraying time was 6 minutes.

[0060] The ratio of alkaline protease to phosphate buffer in S3 is 3 g of alkaline protease dissolved in 100 ml of phosphate buffer, the temperature of the heating device is 30° C., the pH value is controlled at 9, the stirring speed is 50 revolutions per minute, and the enzyme treatment time is 40 minutes.

[0061] The hot water temperature in S4 is 85°C and the soaking time is 10 minutes.

[0062] The start frequency of the ultrasonic cleaning equipment in S5 is 30kHz, the power range is 20W / L, and the first ultrasonic cleaning and the second ultrasonic cleaning time are both 15 minutes, during which new laundry detergent solution needs to be replaced, followed by rinsing with clean water for 3 minutes.

[0063] The thickness of the silk fabric in S6 when spread on the drying tray was 1 cm, and the drying temperature was 50°C.

[0064] The thickness of the wrapping paper in S7 is 0.1 mm, the storage temperature range is 18°C, the relative humidity is controlled at 50%, and the air circulation speed is 0.1 m / s.

[0065] Embodiment 3

[0066] The concentration of the hydrochloric acid solution in which the mulberry silk fabric is immersed in S1 is 0.15 mol / L, the stirring speed is 50 revolutions per minute, the temperature is controlled at 25° C., and the immersion time is 120 minutes.

[0067] The pressure in the hot and humid steam environment in S2 was adjusted to 0.12 MPa, maintained for 40 minutes, the temperature of the spraying hot water was 80°C, and the spraying time was 7 minutes.

[0068] The ratio of alkaline protease to phosphate buffer in S3 is 5 g of alkaline protease dissolved in 100 ml of phosphate buffer, the temperature of the heating device is 40° C., the pH value is controlled at 9.5, the stirring speed is 60 revolutions per minute, and the enzyme treatment time is 50 minutes.

[0069] The hot water temperature in S4 is 95°C and the soaking time is 15 minutes.

[0070] The start frequency of the ultrasonic cleaning equipment in S5 is 40kHz, the power range is 100W / L, and the first ultrasonic cleaning and the second ultrasonic cleaning time are both 15 minutes, during which new laundry detergent solution needs to be replaced, followed by 5 minutes of clean water rinsing.

[0071] The thickness of the silk fabric in S6 when spread on the drying tray is 3 cm, and the drying temperature is 60°C.

[0072] The thickness of the wrapping paper in S7 is 0.3 mm, the storage temperature range is 25°C, the relative humidity is controlled at 60%, and the air circulation speed is 0.3 m / s.

[0073] Table 1 is a comparison table of properties of silk fabrics after treatment in different embodiments

[0074]

[0075]

[0076] The degumming rate refers to the proportion of sericin removed from mulberry silk fabric to the total amount of initial sericin, and the feel refers to the softness and smoothness of the touch when it comes into contact with human skin.

[0077] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A degumming method based on mulberry silk fabric, characterized in that: The following steps are involved: S1: pre-preg treatment, at room temperature, placing a hydrochloric acid solution in a reaction container, and then completely soaking the mulberry silk fabric in the hydrochloric acid solution, while turning on a stirring device to slowly stir; S2: Hot and humid steam degumming: the pre-impregnated silk fabric is placed in a hot and humid steam environment, the pressure is adjusted by a pressure control valve, and then the fabric is sprayed with hot water; S3: preparation and treatment of enzyme solution, dissolving alkaline protease in phosphate buffer, stirring until the protease is dissolved, then placing the mulberry silk fabric in a treatment container, pouring the alkaline protease solution, adjusting the temperature and the pH value by dilute hydrochloric acid and sodium hydroxide solution, and stirring; S4: enzyme inactivation treatment: after the reaction is completed, the fabric is taken out and soaked in hot water to inactivate the enzyme and terminate the reaction; S5: ultrasonic cleaning, placing the silk fabric in an ultrasonic cleaning device, adding a silk-specific laundry detergent solution, and then turning on the ultrasonic device to perform ultrasonic cleaning twice, then taking out the silk fabric, rinsing the fabric with clean water to remove the residual cleaning solution; S6: Drying and softening treatment, spread the silk fabric flat on the drying tray and then send it to the drying room for drying; S7: Packaging and storage. First, roll the dried silk fabric into a regular cylindrical shape, then gently fix the rolled fabric with rubber bands and ribbons, then wrap it with wrapping paper, seal the package with sealing clips, and lay it flat in a dry environment for storage.

2. The degumming method based on mulberry silk fabric according to claim 1, characterized in that: The concentration of the hydrochloric acid solution in S1 is 0.05-0.15 mol / L, the stirring speed is 30-50 revolutions per minute, and the immersion is carried out at a temperature of 20-25° C. for 120 minutes.

3. The degumming method based on mulberry silk fabric according to claim 1, characterized in that: The silk fabric described in S2 is placed in a hot and humid steam environment, and the pressure is adjusted to 0.1-0.12 MPa through a pressure control valve. The silk fabric is kept in the hot and humid steam environment under the pressure for 30-40 minutes, and is sprayed with 60-80°C hot water for 6-7 minutes.

4. The degumming method based on mulberry silk fabric according to claim 1, characterized in that: The ratio of alkaline protease to phosphate buffer in S3 is as follows: 1-5 g of alkaline protease is dissolved in every 100 ml of phosphate buffer, the heating device adjusts the solution temperature to 30-40°C, and the pH value is adjusted by dropwise adding dilute hydrochloric acid or sodium hydroxide solution until the target pH value of 9.0-9.5 is reached. The stirring device stirs at a speed of 50-60 revolutions per minute, and the enzyme treatment is performed for 40-50 minutes.

5. The degumming method based on mulberry silk fabric according to claim 1, characterized in that: The temperature of the hot water in S4 is 85-95° C., and the soaking time of the fabric is maintained at 10-15 minutes.

6. The degumming method based on mulberry silk fabric according to claim 1, characterized in that: The ultrasonic cleaning device in S5 is turned on at a frequency of 30-40kHz, with a power range of 20-100W / L. The first ultrasonic cleaning time is 15 minutes. A new laundry detergent solution is replaced and the ultrasonic device is turned on for a second cleaning for 15 minutes, followed by rinsing with clean water for 3-5 minutes.

7. The degumming method based on mulberry silk fabric according to claim 1, characterized in that: The thickness of the silk fabric spread on the drying plate in S6 is 1-3 cm, and the drying temperature in the drying room is 50-60°C.

8. The degumming method for mulberry silk fabric according to claim 1, characterized in that: The wrapping paper described in S7 is made of a mixture of 70% cotton fiber and 30% hemp fiber, and the thickness of the wrapping paper is 0.1-0.3 mm, the storage temperature range is 18-25°C, the relative humidity is controlled at 50%-60%, the air circulation speed is 0.1-0.3 m / s, and the storage environment uses blackout curtains.

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