Preparation method of long-acting antibacterial leather with wormwood active component

Abstract

The invention relates to a preparation method of long-acting antibacterial leather with wormwood active ingredients. The preparation method comprises the following steps: softening bare leather, carrying out antibacterial pre-tanning, tanning, carrying out antibacterial retanning, filling and dyeing, fatliquoring, carrying out antibacterial treatment, drying and finishing, and carrying out antibacterial coating. Modified cyclodextrin is added in the antibacterial pretanning step, and 1.0-2.0% of modified cyclodextrin (MO / MCD) is added in the antibacterial retanning step, and rotation is conducted for 20 min; antibacterial treatment: adding 2.0 to 3.0 percent of modified cyclodextrin (MO / MCD) clathrate compound into a rotary drum, and rotating for 60 to 120 minutes. The leather antibacterial material is treated by adopting a cyclodextrin inclusion technology, cyclodextrin has a unique cavity structure and can include various antibacterial components, so that the stability and the long-acting antibacterial performance of the leather antibacterial material are improved, modified cyclodextrin with a tanning effect is selected and can react with leather collagen fibers, and the leather antibacterial material is prepared. And the purpose of multiple functions of the tanning agent and the antibacterial agent can be achieved.

Description

Technical Field

[0001] The invention relates to the technical field of leather manufacturing, in particular to a method for preparing long-acting antibacterial leather with wormwood active ingredients. Background Art

[0002] As a product made from processed animal skin, leather has a large number of nutrient sources for microbial growth on its surface and inside, such as protein and fat, which provide favorable conditions for the growth of microorganisms such as bacteria and mold. Especially in a humid and warm environment, leather is more likely to become a breeding ground for bacteria. These microorganisms not only affect the appearance, texture, and service life of the leather, but may also pose a threat to human health. In addition, as consumers pay more attention to health, environmental protection, safety and other aspects, higher requirements are also placed on the antibacterial properties of leather products.

[0003] One of the solutions is to add antibacterial materials during the leather production process. Commonly used antibacterial materials for leather can be mainly divided into inorganic antibacterial materials, organic antibacterial materials and natural antibacterial materials. Among them, inorganic antibacterial materials, such as silver ions, zinc oxide, titanium dioxide, etc., have broad-spectrum antibacterial properties, good heat resistance and stability, but may cause irritation or discoloration when the concentration is too high, and the cost is relatively high; organic antibacterial materials, such as quaternary ammonium salts, alcohols, phenols, pyridines, etc., usually have a faster sterilization speed and stronger sterilization ability, but may have a greater toxicity problem, causing potential harm to the human body and the environment, and poor heat resistance, and may lose antibacterial properties under high temperature conditions; natural antibacterial materials, such as plant extracts (such as eucalyptus oil), are derived from nature, are renewable and environmentally friendly, harmless to the human body, and have good biocompatibility, but like organic antibacterial agents, they have poor thermal stability and are easily affected by environmental factors and lose their antibacterial properties.

[0004] For natural antibacterial materials containing plant active ingredients, how to improve their stability and achieve long-lasting antibacterial effect is an important topic in leather research and application. In view of this, this case came into being. Summary of the invention

[0005] The invention provides a method for preparing long-acting antibacterial leather with wormwood active ingredients, so as to solve the problem that natural antibacterial materials have poor thermal stability and are easily affected by environmental factors and lose their antibacterial properties.

[0006] The present invention adopts the following technical solution:

[0007] A method for preparing long-lasting antibacterial leather with wormwood active ingredients, comprising the following steps: softening bare leather → antibacterial pre-tanning → tanning → antibacterial retanning → filling and dyeing → fatliquoring → antibacterial treatment → drying and finishing → antibacterial finishing; based on the weight of the wet leather of cattle salt,

[0008] Softened bare hide: Use salted wet hide of cattle as raw hide, soak, liming, deliming and softening according to conventional process to obtain softened bare hide, and weigh it as the basis for the subsequent addition of chemical materials;

[0009] Antibacterial pre-tanning: add 30% water and 5-10% modified cyclodextrin (MO / MCD) to the drum, rotate for 4-8 hours, temperature 25 degrees Celsius, speed 7-10rpm, adjust pH to 5.5±0.3, rotate for 1-2 hours, and drain;

[0010] Antibacterial retanning: add 150-200% water and 2.0-3.0% MO / MCD into a drum, adjust the temperature inside the drum to 30-40°C, and rotate for 20-30 minutes; then add 3.0-4.0% chromium powder, 2.0-3.0% chromium-containing tannin, and 1.0-1.5% pickling oil, and rotate for 60-80 minutes; add 1.0-1.5% sodium formate again, and then add 1.0-2.0% modified cyclodextrin (MO / MCD), and rotate for 20 minutes; finally add 0.8-1.0% baking soda, rotate for 40-60 minutes, adjust the pH of the bath liquid to 4.0-4.3, stop the drum overnight, rotate for 20-30 minutes the next day and then drain;

[0011] Antibacterial treatment: add 2.0-3.0% of modified cyclodextrin (MO / MCD) inclusion compound into the drum and rotate for 60-120 minutes; then add 2.5-3.0% of formic acid twice, adjust the pH of the bath liquid to 3.0-3.2, wash with water, and remove from the drum.

[0012] Furthermore, the modified cyclodextrin (MO / MCD) comprises the following steps:

[0013] 1) Weigh 12-15 g of Artemisia argyi oil (MO Nanjing Bermuda Biotechnology Co., Ltd.) and dissolve it in ethanol to obtain solution A;

[0014] 2) Weigh 100g-200g of monochlorotriazine-β-cyclodextrin (MCD Xi'an Ruixi Biotechnology Co., Ltd.) and dissolve it in 60 degrees Celsius water to prepare a saturated aqueous solution B;

[0015] 3) A is added dropwise to B while stirring for 4-6 hours to obtain modified cyclodextrin (MO / MCD).

[0016] Furthermore, the above tanning includes chrome tanning and wet dyeing and finishing pretreatment;

[0017] Chrome tanning: adjust pH to about 3.0, add 3% chrome tanning agent (B = 33-35%, Cr2O3 content = 20-22%), 1.0% sodium formate, rotate for 60 minutes; then add 3% chrome tanning agent, rotate for 120 minutes; check the tanning penetration, after tanning, add about 2% sodium bicarbonate (1:15 dissolved) in 6-8 times to extract alkali, each time rotating for 15 minutes; when pH = 3.2-3.4, add hot water (60-65℃) 100-150%, so that the liquid ratio reaches 2.0-2.5, the internal temperature is 38-42℃; add fungicide, extract alkali to pH = 3.8-4.2, continue to rotate for 120 minutes; take out the drum, let it stand for 1 week, and obtain blue wet leather;

[0018] Wet dyeing and finishing pretreatment: squeeze, stretch and shave the wet blue leather, weigh it, and use 120-150% of the weight to determine the weight of the chemical materials used in the subsequent treatment steps; then put the shaved wet blue leather into a drum and perform rewetting and neutralization treatment according to conventional processes.

[0019] Furthermore, the above-mentioned filling and dyeing (filling, dyeing) is carried out according to conventional processes, 80-100% of water, 3.0-4.0% of polymer retanning agent, 1.0-1.5% of fatliquor are added to the drum, and rotated for 60-80 minutes; then 3.0-4.0% of melamine resin retanning agent, 3.0-4.0% of phenolic tannin, 3.0-4.0% of dicyandiamide resin retanning agent, 3.0-4.0% of synthetic tanning agent, 3.0-4.0% of white tannin are added, and rotated for 30-40 minutes; 2.0-3.0% of dye is added to the drum, rotated for 40-60 minutes, and the incision is checked.

[0020] Furthermore, the above-mentioned fatliquor is carried out according to conventional processes, and 100-150% hot water at a temperature of 50°C and 2.0-2.5% protein filler are added, and rotated for 10-20 minutes; then 3.0-4.0% fatliquor, 3.0-4.0% fatliquor, 2.0-3.0% neatsfoot oil, and 2.0-3.0% synthetic fatliquor are added, and rotated for 60-80 minutes, and dyed thoroughly.

[0021] Furthermore, the above-mentioned finishing includes the following steps: primer coating → calendering → top coating → calendering → top coating → ironing → finished product;

[0022] The primer is applied 2-3 times, with a total coating amount of 10-20g / SF; the topcoat is applied 2-3 times, with a total coating amount of 8-12g / SF; the primer formula is: 250-350 parts of water, 80-100 parts of cationic polyurethane (K-6102), 80-100 parts of cationic casein (K-4080), 180-250 parts of non-ionic oil wax mixture (NI 1303, 1705), 25 parts of cationic paint (KP); 3-5% of the above-mentioned modified cyclodextrin (MO / MCD);

[0023] Top coat 1-2 times, total coating amount 2-5g / SF;

[0024] The top coating formula is: 200-300 parts of water, 50-100 parts of cationic polyurethane (K-6102), 20-50 parts of cationic casein (K-4080), 80-150 parts of non-ionic oil wax (1705), and 3-5% of the above-mentioned modified cyclodextrin (MO / MCD).

[0025] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0026] 1. The cyclodextrin inclusion technology used in this application is used to treat leather antibacterial materials. Cyclodextrin has a unique cavity structure and can include a variety of antibacterial ingredients, thereby improving its stability and long-term antibacterial properties. Furthermore, a modified cyclodextrin with a tanning effect is selected so that it can react with leather collagen fibers, thereby achieving the purpose of having the multi-purpose effects of a tanning agent and an antibacterial agent.

[0027] 2. This application uses selected active ingredients from mugwort and adopts molecular inclusion technology to improve its lack of durability caused by poor stability. Mugwort oil extract has multiple functions, including enhancing the body's anti-allergic ability, reducing the occurrence of allergic diseases, antibacterial and antiviral, inhibiting viral breeding and reproduction, and eliminating pathogens. DETAILED DESCRIPTION

[0028] Embodiment 1:

[0029] A method for preparing long-lasting antibacterial leather with wormwood active ingredients, comprising the following steps: softening bare hides → antibacterial pre-tanning → tanning → antibacterial retanning → filling and dyeing → fatliquoring → antibacterial treatment → drying and finishing → antibacterial finishing. Measured by the weight of wet cow salt hides;

[0030] Softened bare hide: Use salted wet hide as raw hide, soak, liming, deliming and softening according to conventional process to obtain softened bare hide, which is weighed as the basis for the subsequent addition of chemical materials.

[0031] Antibacterial pre-tanning: add 30% water and 5% modified cyclodextrin (MO / MCD) to the drum, rotate for 4 hours, temperature 25 degrees Celsius, speed 10rpm, adjust pH to 5.5±0.3, rotate for 1 hour, and drain.

[0032] Chrome tanning: adjust the pH to about 3.0, add 3% of chrome tanning agent (B = 33-35%, Cr2O3 content = 20-22%), 1.0% of sodium formate, and rotate for 60 minutes; then add 3% of chrome tanning agent and rotate for 120 minutes; check the tanning penetration. After tanning, add about 2% of sodium bicarbonate (dissolved in 1:15) in 6 times to extract alkali, and rotate for 15 minutes each time; when pH = 3.2-3.4, add 100% of hot water (65°C) to make the liquid ratio reach 2.0 and the internal temperature 42°C; add bactericide, extract alkali to pH = 3.8-4.2, and continue to rotate for 120 minutes; remove from the drum, let it stand for 1 week to obtain blue wet leather.

[0033] Wet dyeing and finishing pretreatment: squeeze, stretch and shave the wet blue leather, weigh it, and use 120% of the weight to determine the weight of the chemical materials used in the subsequent treatment steps; then put the shaved wet blue leather into a drum and perform rewetting and neutralization treatment according to conventional processes.

[0034] Antibacterial retanning: add 150% water and 2.0% modified cyclodextrin (MO / MCD) into a rotating drum, adjust the temperature inside the drum to 40°C, and rotate for 20 minutes; then add 4.0% chromium powder, 3.0% chromium-containing tannin, and 1.0% pickling oil, and rotate for 80 minutes; add 1.5% sodium formate again, and then add 2.0% modified cyclodextrin (MO / MCD), and rotate for 20 minutes; finally add 1.0% baking soda, rotate for 60 minutes, adjust the pH of the bath liquid to 4.0-4.3, stop the drum overnight, and drain the liquid after rotating for 30 minutes the next day.

[0035] Filling and dyeing: according to the conventional process, add 100% water, 4.0% polymer retanning agent, 1.5% fatliquor into the drum, rotate for 80 minutes; then add 4.0% melamine resin retanning agent, 4.0% phenolic tannin, 4.0% dicyandiamide resin retanning agent, 4.0% synthetic tanning agent, 4.0% white tannin, rotate for 40 minutes; add 3.0% dye into the drum, rotate for 60 minutes, and check the incision.

[0036] Fatliquor: Follow the conventional process, add 150% hot water at 50°C, 2.5% protein filler, and rotate for 20 minutes; then add 4.0% fatliquor, 4.0% fatliquor, 3.0% neat's foot oil, 3.0% synthetic fatliquor, rotate for 80 minutes, and check for dyeing.

[0037] Antibacterial treatment: add 3.0% modified cyclodextrin (MO / MCD) inclusion compound into the drum and rotate for 120 minutes; then add 3.0% formic acid twice, adjust the pH of the bath solution to 3.0-3.2, wash with water and remove from the drum.

[0038] Finishing: Drying, softening and calendering are carried out according to conventional processes.

[0039] Finishing, finishing includes the following steps: primer → calendering → top coating → calendering → top coating → ironing → finished product;

[0040] Primer coating 3 times, total coating weight 10g / SF; top coating 3 times, total coating weight 8g / SF; the primer formula is: 250 parts of water, 80 parts of cationic polyurethane (K-6102), 80 parts of cationic casein (K-4080), 180 parts of non-ionic oil wax mixture (NI 1303, 1705), 25 parts of cationic paint (KP); 3% of modified cyclodextrin (MO / MCD);

[0041] Top coat twice, total coating amount 3g / SF;

[0042] The top coating formula is: 200 parts of water, 50 parts of cationic polyurethane (K-6102), 20 parts of cationic casein (K-4080), 80 parts of non-ionic oil wax (1705), and 5% of modified cyclodextrin (MO / MCD).

[0043] Furthermore, the modified cyclodextrin (MO / MCD) comprises the following steps:

[0044] 1) Weigh 12 g of Artemisia argyi oil (MO Nanjing Bermuda Biotechnology Co., Ltd.) and dissolve it in ethanol to obtain solution A;

[0045] 2) Weigh 100 g of monochlorotriazine-β-cyclodextrin (MCD Xi'an Ruixi Biotechnology Co., Ltd.) and dissolve it in 60 degrees Celsius water to prepare a saturated aqueous solution B;

[0046] 3) A was added dropwise to B while stirring for 4 hours to obtain modified cyclodextrin (MO / MCD).

[0047] Embodiment 2:

[0048] A method for preparing long-lasting antibacterial leather with wormwood active ingredients, comprising the following steps: softening bare hides → antibacterial pre-tanning → tanning → antibacterial retanning → filling and dyeing → fatliquoring → antibacterial treatment → drying and finishing → antibacterial finishing. Measured by the weight of wet cow salt hides;

[0049] Softened bare hide: Use salted wet hide as raw hide, soak, liming, deliming and softening according to conventional process to obtain softened bare hide, which is weighed as the basis for the subsequent addition of chemical materials.

[0050] Antibacterial pre-tanning: add 30% water and 10% modified cyclodextrin (MO / MCD) to the drum, rotate for 8 hours, temperature 25 degrees Celsius, speed 7rpm, adjust pH to 5.5±0.3, rotate for 2 hours, and drain.

[0051] Chrome tanning: adjust pH to about 3.0, add 3% chrome tanning agent (B = 33-35%, Cr2O3 content = 20-22%), 1.0% sodium formate, and rotate for 60 minutes; then add 3% chrome tanning agent and rotate for 120 minutes; check the tanning penetration. After tanning, add about 2% sodium bicarbonate (1:15 dissolved) in 8 times to extract alkali, and rotate for 15 minutes each time; when pH = 3.2-3.4, add hot water (60°C) 100-150% to make the liquid ratio reach 2.5 and the internal temperature 38°C; add bactericide, extract alkali to pH = 3.8-4.2, and continue to rotate for 120 minutes; remove from the drum, let it stand for 1 week to obtain blue wet leather.

[0052] Wet dyeing and finishing pretreatment: squeeze, stretch and shave the wet blue leather, weigh it, and use 150% of the weight to determine the weight of the chemical materials used in the subsequent treatment steps; then put the shaved wet blue leather into a drum and perform rewetting and neutralization treatment according to conventional processes.

[0053] Antibacterial retanning: add 200% water and 3.0% MO / MCD into a rotating drum, adjust the temperature inside the drum to 30°C, and rotate for 30 minutes; then add 3.0% chromium powder, 2.0% chromium-containing tannin, and 1.5% pickling oil, and rotate for 60 minutes; add 1.0% sodium formate again, and then add 1.0% modified cyclodextrin (MO / MCD), and rotate for 20 minutes; finally add 0.8% baking soda, rotate for 60 minutes, adjust the pH of the bath liquid to 4.0-4.3, stop the drum overnight, and drain the liquid after rotating for 30 minutes the next day.

[0054] Filling and dyeing: according to the conventional process, add 800% water, 3.0% polymer retanning agent, 1.0% fatliquor into the drum, rotate for 60 minutes; then add 3.0% melamine resin retanning agent, 3.0% phenolic tannin, 3.0% dicyandiamide resin retanning agent, 3.0% synthetic tanning agent, 3.0% white tannin, rotate for 30 minutes; add 2.0% dye into the drum, rotate for 40 minutes, and check the incision.

[0055] Fatliquor: Follow the conventional process, add 100% hot water at 50°C, 2.0% protein filler, and rotate for 10 minutes; then add 3.0% fatliquor, 3.0% fatliquor, 2.0% neat's foot oil, and 2.0% synthetic fatliquor, rotate for 60 minutes, and check for thoroughness.

[0056] Antibacterial treatment: add 2.0% modified cyclodextrin (MO / MCD) inclusion compound into the drum and rotate for 60 minutes; then add 2.5% formic acid twice, adjust the pH of the bath solution to 3.0-3.2, wash with water and remove from the drum.

[0057] Finishing: Drying, softening and calendering are carried out according to conventional processes.

[0058] Finishing, finishing includes the following steps: primer → calendering → top coating → calendering → top coating → ironing → finished product;

[0059] Primer coating 2 times, total coating weight 20g / SF; top coating 3 times, total coating weight 12g / SF; the primer formula is: 350 parts of water, 100 parts of cationic polyurethane (K-6102), 100 parts of cationic casein (K-4080), 250 parts of non-ionic oil wax mixture (NI 1303, 1705), 25 parts of cationic paint (KP); 3% modified cyclodextrin (MO / MCD);

[0060] Top coat twice, total coating amount 5g / SF;

[0061] The top coating formula is: 300 parts of water, 100 parts of cationic polyurethane (K-6102), 50 parts of cationic casein (K-4080), 150 parts of non-ionic oil wax (1705), and 3% of modified cyclodextrin (MO / MCD).

[0062] Furthermore, the modified cyclodextrin (MO / MCD) comprises the following steps:

[0063] 1) Weigh 12-15 g of Artemisia argyi oil (MO Nanjing Bermuda Biotechnology Co., Ltd.) and dissolve it in ethanol to obtain solution A;

[0064] 2) Weigh 100g-200g of monochlorotriazine-β-cyclodextrin (MCD Xi'an Ruixi Biotechnology Co., Ltd.) and dissolve it in 60 degrees Celsius water to prepare a saturated aqueous solution B;

[0065] 3) A is added dropwise to B while stirring for 4-6 hours to obtain modified cyclodextrin (MO / MCD).

[0066] Artemisia argyi oil extract is a volatile oil extracted from the dry or fresh leaves of Artemisia argyi, a plant of the Asteraceae family. Its main active ingredients are terpinenol-4 and α-terpineol. Artemisia argyi oil extract has many functions, including enhancing the body's anti-allergic ability, reducing the occurrence of allergic diseases, antibacterial and antiviral, inhibiting the growth and reproduction of viruses, and eliminating pathogens.

[0067] The antibacterial leather with wormwood active ingredients prepared by the technical solution of the present application was tested with the ordinary antibacterial leather after being stored for 90 days. The antibacterial performance was tested according to GB / T 21510-2008 for its antibacterial rate (%), and the bacteria selected were Gram-negative bacteria Escherichia coli (E.coli) and positive bacteria Staphylococcus aureus (S.aureus). The results were:

[0068]

[0069] As shown above, the long-lasting antibacterial leather with mugwort active ingredients produced using patented technology has better antibacterial properties than ordinary antibacterial leather.

[0070] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A method for preparing long-lasting antibacterial leather with wormwood active ingredients, characterized in that: The process includes the following steps: softening bare leather → antibacterial pre-tanning → tanning → antibacterial retanning → filling and dyeing → fatliquoring → antibacterial treatment → drying and finishing → antibacterial coating; wherein, Softening bare skin: using salted wet hide as raw material, soaking, liming, deliming and softening are carried out according to conventional processes to obtain softened bare skin, and weighing is used as the basis for the subsequent addition of chemical materials; Antibacterial pre-tanning: adding 30% water and 5-10% modified cyclodextrin to the drum, rotating for 4-8 hours, the temperature is 25 degrees Celsius, the speed is 7-10rpm, the pH is adjusted to 5.5±0.3, rotating for 1-2 hours, and draining; Antibacterial retanning: add 150-200% water and 2.0-3.0% modified cyclodextrin into the drum, adjust the temperature inside the drum to 30-40°C, and rotate for 20-30 minutes; then add 3.0-4.0% chromium powder, 2.0-3.0% chromium-containing tannin, and 1.0-1.5% pickling oil, and rotate for 60-80 minutes; add 1.0-1.5% sodium formate again, and then add 1.0-2.0% modified cyclodextrin, and rotate for 20 minutes; finally add 0.8-1.0% baking soda, rotate for 40-60 minutes, adjust the pH of the bath liquid to 4.0-4.3, stop the drum overnight, and drain the liquid after rotating for 20-30 minutes the next day; Antibacterial treatment: add 2.0-3.0% of modified cyclodextrin inclusion compound into the drum and rotate for 60-120 minutes; then add 2.5-3.0% of formic acid twice, adjust the pH of the bath liquid to 3.0-3.2, wash with water and remove from the drum.

2. The method for preparing a long-lasting antibacterial leather having wormwood active ingredients as claimed in claim 1, characterized in that: The modified cyclodextrin comprises the following steps: 1) Weigh 12-15 g of wormwood oil and dissolve it in ethanol to obtain solution A; 2) Weigh 100 g to 200 g of monochlorotriazine-β-cyclodextrin and dissolve it in water at 60 degrees Celsius to prepare a saturated aqueous solution B; 3) Add A dropwise to B while stirring for 4-6 hours to obtain modified cyclodextrin.

3. The method for preparing a long-lasting antibacterial leather having wormwood active ingredients as claimed in claim 1, characterized in that: The tanning process includes chrome tanning and wet dyeing and finishing pretreatment; Chrome tanning: adjust pH to about 3.0, add 3% chrome tanning agent, 1.0% sodium formate, rotate for 60 minutes; add 3% chrome tanning agent again, rotate for 120 minutes; check the tanning penetration, after tanning, add about 2% sodium bicarbonate in total for 6-8 times to extract alkali, rotate for 15 minutes each time; when pH = 3.2-3.4, add 100-150% hot water to make the liquid ratio reach 2.0-2.5, the internal temperature is 38-42℃; add fungicide, extract alkali to pH = 3.8-4.2, continue to rotate for 120 minutes; take out of the drum, let it stand for 1 week, and obtain blue wet leather; Wet dyeing and finishing pretreatment: squeeze, stretch and shave the wet blue leather, weigh it, and use 120-150% of the weight to determine the weight of the chemical materials used in the subsequent treatment steps; then put the shaved wet blue leather into a drum and perform rewetting and neutralization treatment according to conventional processes.

4. The method for preparing a long-lasting antibacterial leather having wormwood active ingredients as claimed in claim 1, characterized in that: The filling and dyeing is carried out according to conventional processes, 80-100% of water, 3.0-4.0% of polymer retanning agent, 1.0-1.5% of fatliquor are added into a rotating drum, and the drum is rotated for 60-80 minutes; 3.0-4.0% of melamine resin retanning agent, 3.0-4.0% of phenolic tannin, 3.0-4.0% of dicyandiamide resin retanning agent, 3.0-4.0% of synthetic tanning agent, 3.0-4.0% of white tannin are added, and the drum is rotated for 30-40 minutes; 2.0-3.0% of dye is added into the rotating drum, the drum is rotated for 40-60 minutes, and the incision is checked.

5. The method for preparing a long-lasting antibacterial leather having wormwood active ingredients as claimed in claim 1, characterized in that: The fatliquor is carried out according to conventional processes, 100-150% hot water at a temperature of 50°C and 2.0-2.5% protein filler are added, and the mixture is rotated for 10-20 minutes; then 3.0-4.0% fatliquor, 3.0-4.0% fatliquor, 2.0-3.0% neatsfoot oil and 2.0-3.0% synthetic fatliquor are added, the mixture is rotated for 60-80 minutes, and dyed thoroughly.

6. The method for preparing a long-lasting antibacterial leather having wormwood active ingredients as claimed in claim 1, characterized in that: The coating process includes the following steps: primer coating → calendering → top coating → calendering → top coating → ironing → finished product; Primer 2-3 times, total coating weight 10-20g / SF; topcoat 2-3 times, total coating weight 8-12g / SF; The base coating formula is: 250-350 parts of water, 80-100 parts of cationic polyurethane, 80-100 parts of cationic casein, 180-250 parts of non-ionic oil wax mixture, 25 parts of cationic coating; 3-5% of the modified cyclodextrin; Top coat 1-2 times, total coating amount 2-5g / SF; The top coating formula is: 200-300 parts of water, 50-100 parts of cationic polyurethane, 20-50 parts of cationic casein, 80-150 parts of non-ionic oil wax, and 3-5% of the modified cyclodextrin.

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