阅读说明：本技术 一种植鞣工艺的皮革加工方法及由其形成的牛皮席 (Leather processing method for vegetable tanning technology and cowhide mat formed by leather processing method ) 是由 何海东 吴洪 于 2021-08-04 设计创作，主要内容包括：本发明具体公开了一种植鞣工艺的皮革加工方法及由其形成的牛皮席,所述皮革加工方法,包括如下步骤：将牛皮在转鼓中预浸水,主浸水,浸灰,复灰,脱灰软化,浸酸,初鞣,填充,加油和固定。本发明获得的皮革厚度较厚,舒适度高,且产品无添加剂、无重金属、甲醛含量低,非常适用作为牛皮席,环保、舒适。(The invention specifically discloses a leather processing method of a vegetable tanning process and a cowhide mat formed by the same, wherein the leather processing method comprises the following steps: pre-soaking cowhide in water, main soaking in water, liming, reliming, deliming and softening, pickling, preliminary tanning, filling, oiling and fixing. The leather obtained by the invention has thicker thickness and high comfort level, and the product has no additive, no heavy metal and low formaldehyde content, is very suitable for being used as a cow leather mat, and is environment-friendly and comfortable.)

1. A leather processing method of a vegetable tanning process is characterized by comprising the following steps: the method comprises the following steps: pre-soaking cowhide in water, main soaking in water, liming, reliming, deliming and softening, pickling, primarily tanning, filling, oiling and fixing;

in the deliming softening procedure, the water is washed and the temperature is raised before deliming and softening; adding 2-3 wt% of ammonium sulfate, 0.3-0.7 wt% of deliming agent, 0.3-0.7 wt% of U5 and 0.15-0.25 wt% of degreasing agent into the rotary drum based on the total mass of the cowhide, and rotating for 280-320 minutes; the temperature in the deashing softening process is 30-32 ℃;

in the pickling step, water washing is performed before pickling; adding 6.5-7.5 wt% of sodium chloride, 6.5-7.5 wt% of anhydrous sodium sulphate and 0.9-1.1 wt% of LQ-5 into a rotary drum based on the total mass of the cowhide, and rotating for 50-70 minutes; adding 1.5-2.5 wt% of sulfuric acid, and rotating for 160-200 minutes; then autorotation is carried out for 8-10 hours; the temperature in the pickling process is normal temperature, and the pH value is 7.8-8.2;

in the primary tanning procedure, the rotary motion is firstly carried out for 20 minutes; adding GT50 with the weight percent of 4-4.4% into the rotary drum based on the total mass of the cowhide, and rotating for 280-320 minutes; then autorotation is carried out for 8-10 hours; then rotating for 20 minutes; then adding 0.9-1.1 wt% of sodium formate, and rotating for 50-70 minutes; adding 1.5-2.5 wt% of baking soda, wherein the baking soda is added for 5 times, and rotating for 30 minutes after each addition; rotating for 160-200 minutes; then autorotation is carried out for 32-34 hours; then rotating for 20 minutes again, and washing out the drum;

in the filling procedure, the filling material is washed clean by water before filling; adding 25-35 wt% of water, 1-2 wt% of LQ-5, 1-2 wt% of HFK, 0.2-0.4 wt% of EDTA and 0.9-1.1 wt% of 308 into a rotary drum based on the total mass of the cowhide, and rotating for 15-25 minutes; then adding 25-35 wt% of FS and 9-11 wt% of ATO, and rotating for 50-70 minutes; then autorotation is carried out for 8-10 hours; rotating for 72 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then, the tannin extract is eaten; the temperature in the filling step is normal temperature.

2. The leather processing method according to claim 1, wherein: in the pre-soaking step, based on the total mass of the cowhide, 280-320 wt% of water and 0.15-0.25 wt% of soda ash are added into a rotary drum and rotated for 100-140 minutes; then adding 0.15-0.25 wt% of soda ash and 0.1-0.2 wt% of KL for rotating for 8-10 hours, wherein the solution stands for 40 minutes every 20 minutes of rotation; the temperature in the pre-soaking step is normal temperature.

3. The leather processing method according to claim 1, wherein: in the main soaking procedure, based on the total mass of the cowhide, 90-110 wt% of water, 0.15-0.25 wt% of soda ash, 0.03-0.07 wt% of KF, 0.03-0.07 wt% of KL and 0.1-0.2 wt% of 2C are added into a rotary drum, the rotary drum rotates for 30 minutes, then the rotary drum is static for 30 minutes, the rotation and static are a cycle, and the cycle is 2 times; then adding 0.15-0.25 wt% of soda ash, 0.15-0.25 wt% of degreasing agent, 0.03-0.07 wt% of KF and 0.03-0.07 wt% of KL, and rotating for 8-10 hours, wherein the mixture stands for 30 minutes every 30 minutes of rotation; the temperature in the pre-soaking step is normal temperature.

4. The leather processing method according to claim 1, wherein: in the liming procedure, the lime is washed clean by water before liming; adding 60-80 wt% of water and 0.3-0.5 wt% of PLE into the rotary drum based on the total mass of the cowhide, and rotating for 50-70 minutes; then adding 0.4-0.6 wt% of sodium hydrosulfide and rotating for 25-35 minutes; then adding 1.2-1.3 wt% of sodium sulfide, 0.3-0.7 wt% of lime and 0.3-0.5 wt% of butyl-1, rotating for 30 minutes and standing for 30 minutes; adding 1.2-1.3 wt% of sodium sulfide and 1.3-1.7 wt% of lime, rotating for 20 minutes, then standing for 40 minutes, wherein the rotation and the standing are a cycle, and circulating for 5 times; then adding 75-85 wt% of water, 0.3-0.7 wt% of LM-5, 2.5-3.5 wt% of lime, 0.15-0.25 wt% of caustic soda and 0.15-0.25 wt% of degreasing agent, and rotating for 8-10 hours, wherein the mixture stands for 47 minutes after rotating for 13 minutes; the temperature in the liming process is normal temperature.

5. The leather processing method according to claim 1, wherein: in the ash recovery procedure, based on the total mass of the cowhide, 180-220 wt% of water, 0.3-0.7 wt% of sodium sulfide, 0.3-0.7 wt% of butane-1 and 3.5-4.5 wt% of lime are added into the rotary drum and rotated for 25-35 minutes; then autorotation is carried out for 8-10 hours, wherein the rotation is carried out for 1 minute and the standing is carried out for 9 minutes; the temperature in the ash recovery process is normal temperature.

6. The leather processing method according to claim 1, wherein: in the oiling procedure, the oil is rotated for 30 minutes before oiling, and the oil is washed clean by water; adding 2.5-3.5 wt% of hydrogen peroxide into the rotary drum based on the total mass of the cowhide, and rotating for 100-140 minutes; adding 0.9-1.1 wt% of oxalic acid, and rotating for 80-100 minutes; washing with water, and then heating to 40-42 ℃ in the rotary drum; adding 50-70 wt% of water, 3.5-4.5 wt% of HFK, 1-2 wt% of A-22, 0.3-0.7 wt% of LQ-5, 1-1.4 wt% of formaldehyde capture accelerator, 0.2-0.4 wt% of EDTA, 0.3-0.7 wt% of baking soda and 0.05-0.07 wt% of mildew preventive, and rotating for 50-70 minutes; then autorotation is carried out for 8-10 hours.

7. The leather processing method according to claim 1, wherein: in the fixing procedure, the rotation is firstly carried out for 30 minutes; adding 2.5-3.5 wt% of SA into the rotary drum, rotating for 50-70 minutes by taking the total mass of the cowhide as a reference, and washing with water; and then adding 0.1-0.3 wt% of EDTA, 0.03-0.07 wt% of baking soda and 0.03-0.05 wt% of mildew preventive, rotating for 8-12 minutes, and taking out the drum.

8. The leather processing method according to claim 1, wherein: in the pickling step, the rotation is stopped for 9 minutes every 1 minute of rotation.

9. The leather processing method according to claim 1, wherein: in the primary tanning process, the self-rotation is stopped for 9 minutes every 1 minute of rotation.

10. A cow mat produced by the leather processing method according to any one of claims 1 to 9.

Technical Field

The invention relates to the technical field of leather materials, in particular to a leather processing method of a vegetable tanning process and a cowhide mat formed by the same.

Background

The vegetable tanning is a process name for treating raw skins. The raw skin removed from the animal is called hide or skin, i.e. skin, and the raw hide or skin may rot. The raw leather after the process treatment is called leather.

The cow leather mat has the functions of ventilation, heat absorption, constant temperature, softness, heat dissipation, moisture prevention, skin friendliness and the like, and has good health care effect on the old, the weak, the arthritis and the scapulohumeral periarthritis. In recent years, along with the increasing living standard and the requirement for comfort, the cowhide mat is favored by people, and simultaneously, the higher requirement on the quality of the cowhide mat is also put forward. At present, the existing cow leather mat containing heavy metal chromium is a common problem and has certain harm to human bodies.

The production of a cow leather mat product without heavy metal chromium depends to a certain extent on chemical materials and process conditions used in the leather making process, and a lot of complex chemical and mechanical treatments are needed from the raw leather to the leather which meets the product quality requirements.

Disclosure of Invention

The invention aims to provide a leather processing method of a vegetable tanning process and a cowhide mat formed by the same, so as to solve the problem that the conventional cowhide mat contains heavy metal chromium.

In order to achieve the purpose, the technical scheme of the invention is as follows: a leather processing method of a vegetable tanning process comprises the following steps: pre-soaking cowhide in water, main soaking in water, liming, reliming, deliming and softening, pickling, primarily tanning, filling, oiling and fixing;

in the deliming softening procedure, the water is washed and the temperature is raised before deliming and softening; adding 2-3 wt% of ammonium sulfate, 0.3-0.7 wt% of deliming agent, 0.3-0.7 wt% of U5 and 0.15-0.25 wt% of degreasing agent into the rotary drum based on the total mass of the cowhide, and rotating for 280-320 minutes; the temperature in the deashing softening process is 30-32 ℃;

in the pickling step, water washing is performed before pickling; adding 6.5-7.5 wt% of sodium chloride, 6.5-7.5 wt% of anhydrous sodium sulphate and 0.9-1.1 wt% of LQ-5 into a rotary drum based on the total mass of the cowhide, and rotating for 50-70 minutes; adding 1.5-2.5 wt% of sulfuric acid, and rotating for 160-200 minutes; then autorotation is carried out for 8-10 hours; the temperature in the pickling process is normal temperature, and the pH value is 7.8-8.2;

in the primary tanning procedure, the rotary motion is firstly carried out for 20 minutes; adding GT50 with the weight percent of 4-4.4% into the rotary drum based on the total mass of the cowhide, and rotating for 280-320 minutes; then autorotation is carried out for 8-10 hours; then rotating for 20 minutes; then adding 0.9-1.1 wt% of sodium formate, and rotating for 50-70 minutes; adding 1.5-2.5 wt% of baking soda, wherein the baking soda is added for 5 times, and rotating for 30 minutes after each addition; rotating for 160-200 minutes; then autorotation is carried out for 32-34 hours; then rotating for 20 minutes again, and washing out the drum;

in the filling procedure, the filling material is washed clean by water before filling; adding 25-35 wt% of water, 1-2 wt% of LQ-5, 1-2 wt% of HFK, 0.2-0.4 wt% of EDTA and 0.9-1.1 wt% of 308 into a rotary drum based on the total mass of the cowhide, and rotating for 15-25 minutes; then adding 25-35 wt% of FS and 9-11 wt% of ATO, and rotating for 50-70 minutes; then autorotation is carried out for 8-10 hours; rotating for 72 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then, the tannin extract is eaten; the temperature in the filling step is normal temperature.

Further, in the pre-soaking step, based on the total mass of the cowhide, 280-320 wt% of water and 0.15-0.25 wt% of soda ash are added into the rotary drum and rotated for 100-140 minutes; then adding 0.15-0.25 wt% of soda ash and 0.1-0.2 wt% of KL for rotating for 8-10 hours, wherein the solution stands for 40 minutes every 20 minutes of rotation; the temperature in the pre-soaking step is normal temperature.

Furthermore, in the main soaking process, based on the total mass of the cowhide, 90-110 wt% of water, 0.15-0.25 wt% of soda ash, 0.03-0.07 wt% of KF, 0.03-0.07 wt% of KL and 0.1-0.2 wt% of 2C are added into the rotary drum, the rotary drum rotates for 30 minutes, then the rotary drum stands for 30 minutes, the rotary drum stands for one cycle, and the cycle is repeated for 2 times; then adding 0.15-0.25 wt% of soda ash, 0.15-0.25 wt% of degreasing agent, 0.03-0.07 wt% of KF and 0.03-0.07 wt% of KL, and rotating for 8-10 hours, wherein the mixture stands for 30 minutes every 30 minutes of rotation; the temperature in the pre-soaking step is normal temperature.

Furthermore, in the liming procedure, the lime is washed clean by water before liming; adding 60-80 wt% of water and 0.3-0.5 wt% of PLE into the rotary drum based on the total mass of the cowhide, and rotating for 50-70 minutes; then adding 0.4-0.6 wt% of sodium hydrosulfide and rotating for 25-35 minutes; then adding 1.2-1.3 wt% of sodium sulfide, 0.3-0.7 wt% of lime and 0.3-0.5 wt% of butyl-1, rotating for 30 minutes and standing for 30 minutes; adding 1.2-1.3 wt% of sodium sulfide and 1.3-1.7 wt% of lime, rotating for 20 minutes, then standing for 40 minutes, wherein the rotation and the standing are a cycle, and circulating for 5 times; then adding 75-85 wt% of water, 0.3-0.7 wt% of LM-5, 2.5-3.5 wt% of lime, 0.15-0.25 wt% of caustic soda and 0.15-0.25 wt% of degreasing agent, and rotating for 8-10 hours, wherein the mixture stands for 47 minutes after rotating for 13 minutes; the temperature in the liming process is normal temperature.

Furthermore, in the ash recovery procedure, based on the total mass of the cowhide, 180-220 wt% of water, 0.3-0.7 wt% of sodium sulfide, 0.3-0.7 wt% of butane-1 and 3.5-4.5 wt% of lime are added into the rotary drum and rotated for 25-35 minutes; then autorotation is carried out for 8-10 hours, wherein the rotation is carried out for 1 minute and the standing is carried out for 9 minutes; the temperature in the ash recovery process is normal temperature.

Furthermore, in the oiling process, the oil is rotated for 30 minutes before oiling, and the oil is washed clean by water; adding 2.5-3.5 wt% of hydrogen peroxide into the rotary drum based on the total mass of the cowhide, and rotating for 100-140 minutes; adding 0.9-1.1 wt% of oxalic acid, and rotating for 80-100 minutes; washing with water, and then heating to 40-42 ℃ in the rotary drum; adding 50-70 wt% of water, 3.5-4.5 wt% of HFK, 1-2 wt% of A-22, 0.3-0.7 wt% of LQ-5, 1-1.4 wt% of formaldehyde capture accelerator, 0.2-0.4 wt% of EDTA, 0.3-0.7 wt% of baking soda and 0.05-0.07 wt% of mildew preventive, and rotating for 50-70 minutes; then autorotation is carried out for 8-10 hours.

Further, in the fixing step, the rotation is performed for 30 minutes; adding 2.5-3.5 wt% of SA into the rotary drum, rotating for 50-70 minutes by taking the total mass of the cowhide as a reference, and washing with water; and then adding 0.1-0.3 wt% of EDTA, 0.03-0.07 wt% of baking soda and 0.03-0.05 wt% of mildew preventive, rotating for 8-12 minutes, and taking out the drum.

Further, in the pickling step, the rotation was stopped for 9 minutes every 1 minute of rotation.

Further, in the primary tanning process, the self-rotation was stopped for 9 minutes every 1 minute of rotation.

The invention also provides the cow leather mat prepared by the leather processing method.

The beneficial effects of this technical scheme lie in: the leather obtained by the method for processing the cow leather mat by the vegetable tanning process is thick, high in comfort level, free of additives and heavy metals, low in formaldehyde content, and very suitable for being used as the cow leather mat, and is environment-friendly and comfortable.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention relates to a leather processing method of a vegetable tanning process, which comprises the following steps: pre-soaking cowhide in water, main soaking in water, liming, reliming, deliming and softening, pickling, preliminary tanning, filling, oiling and fixing.

Example 1

In the pre-soaking process, 280 wt% of water and 0.15 wt% of soda ash are added into a rotary drum and rotated for 100 minutes by taking the total mass of the cowhide as a reference; then 0.15 wt% of soda ash and 0.1 wt% of KL are added and rotated for 8 hours, wherein the mixture is stopped for 40 minutes every 20 minutes of rotation. The temperature in the pre-soaking step is normal temperature.

In the main soaking process, based on the total mass of the cowhide, 90 wt% of water, 0.15 wt% of soda ash, 0.03 wt% of KF, 0.03 wt% of KL and 0.1 wt% of 2C are added into a rotary drum, the rotary drum rotates for 30 minutes, then the rotary drum stands for 30 minutes, the rotation and the stand are a cycle, and the cycle is 2 times; then adding 0.15 wt% of soda ash, 0.15 wt% of degreasing agent, 0.03 wt% of KF and 0.03 wt% of KL, rotating for 8 hours, and standing for 30 minutes every 30 minutes of rotation. The temperature in the pre-soaking step is normal temperature.

In the liming procedure, the materials are washed clean by water before liming; adding 60 wt% of water and 0.3 wt% of PLE into the rotary drum based on the total mass of the cowhide, and rotating for 50 minutes; then adding 0.4 wt% of sodium hydrosulfide and rotating for 25 minutes; then adding 1.2 wt% of sodium sulfide, 0.3 wt% of lime and 0.3 wt% of butane-1, rotating for 30 minutes, and standing for 30 minutes; then adding 1.2 wt% of sodium sulfide and 1.3 wt% of lime, rotating for 20 minutes, then standing for 40 minutes, rotating and standing for one cycle, and circulating for 5 times; then adding 75 wt% of water, 0.3 wt% of LM-5, 2.5 wt% of lime, 0.15 wt% of caustic soda and 0.15 wt% of degreasing agent, and rotating for 8 hours, wherein the mixture stands for 47 minutes every 13 minutes of rotation. The temperature in the liming process is normal temperature.

In the lime-recovering procedure, based on the total mass of the cowhide, 180 wt% of water, 0.3 wt% of sodium sulfide, 0.3 wt% of butane-1 and 3.5 wt% of lime are added into a rotary drum and rotated for 25 minutes; then autorotated for another 8 hours with rest for 9 minutes every 1 minute of autorotation. The temperature in the ash recovery process is normal temperature.

In the deliming softening process, the water is washed and the temperature is raised before deliming and softening; based on the total mass of the cowhide, 2 wt% of ammonium sulfate, 0.3 wt% of deliming agent, 0.3 wt% of U5 and 0.15 wt% of degreasing agent are added into the rotary drum and rotated for 280 minutes. The temperature in the deliming and softening step was 30 ℃.

In the pickling process, water washing is performed before pickling; adding 6.5 wt% of sodium chloride, 6.5 wt% of anhydrous sodium sulphate and 0.9 wt% of LQ-5 into a rotary drum based on the total mass of the cow leather, and rotating for 50 minutes; adding 1.5 wt% sulfuric acid and rotating for 160 min; then autorotated for another 8 hours with rest for 9 minutes every 1 minute of autorotation. The temperature in the pickling step was room temperature, and the pH was 7.8.

In the primary tanning procedure, firstly rotating for 20 minutes; adding GT50 with the weight percent of 4 percent into the rotary drum based on the total mass of the cowhide, and rotating for 280 minutes; then rotating for 8 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then rotating for 20 minutes; then adding 0.9 wt% of sodium formate, and rotating for 50 minutes; adding 1.5 wt% of baking soda, wherein the baking soda is added for 5 times, and rotating for 30 minutes after each addition; rotating for another 160 minutes; then rotating for 32 hours, wherein the spinning is carried out for 1 minute and the standing is carried out for 9 minutes, and the spinning is carried out for 1 minute and the standing is carried out for 9 minutes; then turned for another 20 minutes and the drum was washed out with water.

In the filling procedure, water is firstly washed clean before filling; adding 25 wt% of water, 1 wt% of LQ-5, 1 wt% of HFK, 0.2 wt% of EDTA and 0.9 wt% of 308 into a rotary drum based on the total mass of the cow leather, and rotating for 15 minutes; then adding 25 wt% of FS and 9 wt% of ATO, and rotating for 50 minutes; then autorotation is carried out for 8 hours; rotating for 72 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then the tannin extract is eaten. The temperature in the filling step is normal temperature.

In the oiling process, the oil is rotated for 30 minutes before oiling, and the oil is washed clean by water; adding 2.5 wt% of hydrogen peroxide into the rotary drum based on the total mass of the cowhide, and rotating for 100 minutes; adding 0.9 wt% of oxalic acid and rotating for 80 minutes; washing with water, and heating to 40 deg.C; then adding 50 wt% of water, 3.5 wt% of HFK, 1 wt% of A-22, 0.3 wt% of LQ-5, 1 wt% of formaldehyde capture promoter, 0.2 wt% of EDTA, 0.3 wt% of baking soda and 0.05 wt% of mildew preventive, and rotating for 50 minutes; then autorotated for another 8 hours.

In the fixing procedure, firstly rotating for 30 minutes; adding 2.5 wt% of SA into the rotary drum based on the total mass of the cowhide, rotating for 50 minutes, and washing with water; 0.1 wt% of EDTA, 0.03 wt% of sodium bicarbonate and 0.03 wt% of mildewcide are added and rotated for 8 minutes, and then the mixture is taken out of the drum.

Example 2

In the pre-soaking process, 300 wt% of water and 0.2 wt% of soda ash are added into a rotary drum and rotated for 120 minutes by taking the total mass of the cowhide as a reference; then 0.2 wt% of soda ash and 0.15 wt% of KL are added, and the mixture is rotated for 9 hours, wherein the mixture is stopped for 40 minutes every 20 minutes of rotation. The temperature in the pre-soaking step is normal temperature.

In the main soaking process, based on the total mass of the cowhide, 100 wt% of water, 0.2 wt% of soda ash, 0.05 wt% of KF, 0.05 wt% of KL and 0.15 wt% of 2C are added into a rotary drum, the rotary drum rotates for 30 minutes, then the rotary drum stands for 30 minutes, the rotation and the stand are a cycle, and the cycle is 2 times; then 0.2 wt% of soda ash, 0.2 wt% of degreasing agent, 0.05 wt% of KF and 0.05 wt% of KL are added, and the mixture is rotated for 9 hours, wherein the mixture is stopped for 30 minutes every 30 minutes of rotation. The temperature in the pre-soaking step is normal temperature.

In the liming procedure, the materials are washed clean by water before liming; adding 70 wt% of water and 0.4 wt% of PLE into the rotary drum based on the total mass of the cowhide, and rotating for 60 minutes; then adding 0.5 wt% of sodium hydrosulfide and rotating for 30 minutes; then adding 1.25 wt% of sodium sulfide, 0.5 wt% of lime and 0.4 wt% of butane-1, rotating for 30 minutes, and standing for 30 minutes; then adding 1.25 wt% of sodium sulfide and 1.5 wt% of lime, rotating for 20 minutes, then standing for 40 minutes, rotating and standing for one cycle, and circulating for 5 times; then 80 wt% of water, 0.5 wt% of LM-5, 3 wt% of lime, 0.2 wt% of caustic soda and 0.2 wt% of degreasing agent are added, and the mixture is rotated for 9 hours, wherein the mixture is still for 47 minutes every 13 minutes of rotation. The temperature in the liming process is normal temperature.

In the lime-recovering procedure, based on the total mass of the cowhide, 200 wt% of water, 0.5 wt% of sodium sulfide, 0.5 wt% of butane-1 and 4 wt% of lime are added into a rotary drum and rotated for 30 minutes; then, the mixture was allowed to spin for 9 hours, and then was allowed to stand for 9 minutes every 1 minute of spinning. The temperature in the ash recovery process is normal temperature.

In the deliming softening process, the water is washed and the temperature is raised before deliming and softening; based on the total mass of the cowhide, 2.5 wt% of ammonium sulfate, 0.5 wt% of deliming agent, 0.5 wt% of U5 and 0.2 wt% of degreasing agent are added into the rotary drum and rotated for 300 minutes. The temperature in the deliming and softening step was 31 ℃.

In the pickling process, water washing is performed before pickling; adding 7 wt% of sodium chloride, 7 wt% of anhydrous sodium sulphate and 1 wt% of LQ-5 into the rotary drum based on the total mass of the cowhide, and rotating for 60 minutes; then adding 2 wt% of sulfuric acid and rotating for 180 minutes; then, the mixture was allowed to spin for 9 hours, and then was allowed to stand for 9 minutes every 1 minute of spinning. The temperature in the pickling step was room temperature, and the pH was 8.

In the primary tanning procedure, firstly rotating for 20 minutes; adding GT50 with the weight percent of 4.2 percent into the rotary drum based on the total mass of the cow leather, and rotating for 300 minutes; then rotating for 9 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then rotating for 20 minutes; adding 1 wt% of sodium formate, and rotating for 60 minutes; adding 2 wt% of baking soda, wherein the baking soda is added for 5 times, and rotating for 30 minutes after each addition; rotating for 180 minutes; then rotating for 33 hours, wherein the spinning is carried out for 1 minute and the standing is carried out for 9 minutes, and the spinning is carried out for 1 minute and the standing is carried out for 9 minutes; then turned for another 20 minutes and the drum was washed out with water.

In the filling procedure, water is firstly washed clean before filling; adding 30 wt% of water, 1.5 wt% of LQ-5, 1.5 wt% of HFK, 0.3 wt% of EDTA and 1 wt% of 308 into a rotary drum based on the total mass of the cowhide, and rotating for 20 minutes; then adding 30 wt% of FS and 10 wt% of ATO, and rotating for 60 minutes; then autorotation is carried out for 9 hours; rotating for 72 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then the tannin extract is eaten. The temperature in the filling step is normal temperature.

In the oiling process, the oil is rotated for 30 minutes before oiling, and the oil is washed clean by water; adding 3 wt% of hydrogen peroxide into the rotary drum and rotating for 120 minutes based on the total mass of the cowhide; adding 1 wt% of oxalic acid, and rotating for 90 minutes; washing with water, and heating to 41 deg.C; then 60 wt% of water, 4 wt% of HFK, 1.5 wt% of A-22, 0.5 wt% of LQ-5, 1.2 wt% of formaldehyde capture promoter, 0.3 wt% of EDTA, 0.5 wt% of baking soda and 0.06 wt% of mildew preventive are added for rotating for 60 minutes; and then rotated for another 9 hours.

In the fixing procedure, firstly rotating for 30 minutes; adding 3 wt% of SA into the rotary drum, rotating for 60 minutes by taking the total mass of the cowhide as a reference, and washing with water; 0.2 wt% of EDTA, 0.05 wt% of sodium bicarbonate and 0.04 wt% of mildewcide are added and rotated for 10 minutes, and then the mixture is discharged out of the drum.

Example 3

In the pre-soaking step, based on the total mass of the cowhide, 320 wt% of water and 0.25 wt% of soda ash are added into a rotary drum and rotated for 140 minutes; then 0.25 wt% of soda ash and 0.2 wt% of KL are added, and the mixture is rotated for 10 hours, wherein the mixture is stopped for 40 minutes every 20 minutes of rotation. The temperature in the pre-soaking step is normal temperature.

In the main soaking process, based on the total mass of the cowhide, 110 wt% of water, 0.25 wt% of soda ash, 0.07 wt% of KF, 0.07 wt% of KL and 0.2 wt% of 2C are added into a rotary drum, the rotary drum rotates for 30 minutes, then the rotary drum stands for 30 minutes, the rotation and the stand are in a cycle, and the cycle is 2 times; then 0.25 wt% of soda ash, 0.25 wt% of degreasing agent, 0.07 wt% of KF and 0.07 wt% of KL are added, and the mixture is rotated for 10 hours, wherein the mixture is stopped for 30 minutes every 30 minutes of rotation. The temperature in the pre-soaking step is normal temperature.

In the liming procedure, the materials are washed clean by water before liming; adding 80 wt% of water and 0.5 wt% of PLE into the rotary drum based on the total mass of the cowhide, and rotating for 70 minutes; then adding 0.6 wt% of sodium hydrosulfide and rotating for 35 minutes; then adding 1.3 wt% of sodium sulfide, 0.7 wt% of lime and 0.5 wt% of butane-1, rotating for 30 minutes, and standing for 30 minutes; then adding 1.3 wt% of sodium sulfide and 1.7 wt% of lime, rotating for 20 minutes, then standing for 40 minutes, rotating and standing for one cycle, and circulating for 5 times; then adding 85 wt% of water, 0.7 wt% of LM-5, 3.5 wt% of lime, 0.25 wt% of caustic soda and 0.25 wt% of degreasing agent, and rotating for 10 hours, wherein the mixture stands for 47 minutes every 13 minutes of rotation. The temperature in the liming process is normal temperature.

In the lime-recovering procedure, based on the total mass of the cowhide, 220 wt% of water, 0.7 wt% of sodium sulfide, 0.7 wt% of butane-1 and 4.5 wt% of lime are added into a rotary drum and rotated for 35 minutes; then autorotated for another 10 hours with rest for 9 minutes every 1 minute of autorotation. The temperature in the ash recovery process is normal temperature.

In the deliming softening process, the water is washed and the temperature is raised before deliming and softening; based on the total mass of the cowhide, 3 wt% of ammonium sulfate, 0.7 wt% of deliming agent, 0.7 wt% of U5 and 0.25 wt% of degreasing agent are added into the rotary drum and rotated for 320 minutes. The temperature in the deliming and softening step was 32 ℃.

In the pickling process, water washing is performed before pickling; adding 7.5 wt% of sodium chloride, 7.5 wt% of anhydrous sodium sulphate and 1.1 wt% of LQ-5 into a rotary drum based on the total mass of the cow leather, and rotating for 70 minutes; then adding 2.5 wt% sulfuric acid and rotating for 200 minutes; then autorotated for another 10 hours with rest for 9 minutes every 1 minute of autorotation. The temperature in the pickling step was room temperature, and the pH was 8.2.

In the primary tanning procedure, firstly rotating for 20 minutes; adding GT50 in an amount of 4.4 wt% into the rotary drum based on the total mass of the cowhide, and rotating for 320 minutes; then autorotation is carried out for 10 hours, wherein the rotation is carried out for 1 minute and the rest is carried out for 9 minutes; then rotating for 20 minutes; adding 1.1 wt% of sodium formate, and rotating for 70 minutes; adding 2.5 wt% of baking soda, wherein the baking soda is added for 5 times, and rotating for 30 minutes after each addition; rotating for 200 minutes; then rotating for 34 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then turned for another 20 minutes and the drum was washed out with water.

In the filling procedure, water is firstly washed clean before filling; adding 35 wt% of water, 2 wt% of LQ-5, 2 wt% of HFK, 0.4 wt% of EDTA and 1.1 wt% of 308 into a rotary drum based on the total mass of the cow leather, and rotating for 25 minutes; adding 35 wt% of FS and 11 wt% of ATO, and rotating for 70 minutes; then autorotation is carried out for 10 hours; rotating for 72 hours, wherein the rotation lasts for 1 minute and the rest lasts for 9 minutes; then the tannin extract is eaten. The temperature in the filling step is normal temperature.

In the oiling process, the oil is rotated for 30 minutes before oiling, and the oil is washed clean by water; adding 3.5 wt% of hydrogen peroxide into the rotary drum based on the total mass of the cowhide, and rotating for 140 minutes; adding 1.1 wt% of oxalic acid, and rotating for 100 minutes; washing with water, and heating to 42 deg.C; then 70 wt% of water, 4.5 wt% of HFK, 2 wt% of A-22, 0.7 wt% of LQ-5, 1.4 wt% of formaldehyde capture promoter, 0.4 wt% of EDTA, 0.7 wt% of baking soda and 0.07 wt% of mildew preventive are added for rotating for 70 minutes; then autorotated for another 10 hours.

In the fixing procedure, firstly rotating for 30 minutes; adding 3.5 wt% of SA into the rotary drum, rotating for 70 minutes by taking the total mass of the cowhide as a reference, and washing with water; 0.3 wt% of EDTA, 0.07 wt% of sodium bicarbonate and 0.05 wt% of mildewcide are added and rotated for 12 minutes, and then the mixture is discharged out of the drum.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is merely an example of the present invention, and common general knowledge in the field of known specific structures and characteristics is not described herein in any greater extent than that known in the art at the filing date or prior to the priority date of the application, so that those skilled in the art can now appreciate that all of the above-described techniques in this field and have the ability to apply routine experimentation before this date can be combined with one or more of the present teachings to complete and implement the present invention, and that certain typical known structures or known methods do not pose any impediments to the implementation of the present invention by those skilled in the art. It should be noted that, for those skilled in the art, without departing from the structure of the present invention, several changes and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.