Method for tanning by jointly using compound protease soaked with water, titanium salt and zinc salt

A compound protease combined with tanning technology, which is applied in the production field of leather industry, can solve the problems such as difficult to obtain tanning effect, achieve good pH stability and thermal stability, reduce chromium emission, and reduce the effect of processing difficulty

Active Publication Date: 2016-03-30
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

The inorganic tanning agents used in the commonly used inorganic tanning methods include aluminum, titanium, zirconium, iron, zinc salts, etc., an

Method used

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  • Method for tanning by jointly using compound protease soaked with water, titanium salt and zinc salt
  • Method for tanning by jointly using compound protease soaked with water, titanium salt and zinc salt
  • Method for tanning by jointly using compound protease soaked with water, titanium salt and zinc salt

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Effect test

Embodiment 1

[0027] The used technological process of the present invention is as shown in table 1, and the specific operation steps of each operation of the tanning workshop section of tanning process and materials used are as follows:

[0028] (1) Soaking in water: carried out in a drum, water: 200%; temperature: 25°C; alkaline protease produced by alkalophilic bacillus strain: 0.5wt%; heavy metal-resistant protease powder: 0.1wt%; add water from the drum door, compound Protease powder, cowhide, turn for 60 minutes, stop for 20 minutes, turn for 20 minutes, stop for 50 minutes, first turn for 40 minutes in the first 2 hours, stop for 20 minutes (second time), turn for 20 minutes in the next 2 hours, stop for 40 minutes (second time), and then carry out the follow-up routine Depilation and liming and other processes.

[0029] (2) pickling: carry out in the drum, the liquid ratio is 1, add NaCl8wt%, the acid used to adjust the pH is sulfuric acid and formic acid, the volume ratio of the tw...

Embodiment 2

[0033] Observing the Effect of Alkaline Protease Powder on Water Soaking of Leather

[0034] As shown in Table 4, take the corresponding quality of alkaline protease powder and place it in a Kuber dish, add deionized water to keep the liquid level at the scale of 0mL, then put skin samples into different Kuber dishes, lift Lift the spherical end of the Kuber dish to completely reflux the liquid to the cylindrical end, so that the skin sample is completely immersed in the liquid, and then use plastic wrap to seal the cylindrical end to prevent moisture from evaporating. Then at 15min, 30min, 60min, 120min and 24h, lift the cylindrical end to make the liquid flow into the spherical end completely, read the scale and calculate the water absorption rate after 1min, the result is as follows figure 1 shown. It can be seen that protease powder significantly improves the water absorption rate of hides during immersion.

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Abstract

The invention relates to a method for tanning leather by jointly using alkaline protease, titanium salt and zinc salt. When the alkaline protease serves as a soaking auxiliary agent, NaCl is adjusted in a soaking process. Compared with a simple soaking method, the method can effectively shorten the time by 8-10 hours, and wet-white leather tanned by titanium and zinc can meet requirements on splitting temperature. The technology in the invention meets requirements of environmental protection, by alkaline protease powder, collagen is filled with water fully in a soaking procedure, soaking time is shortened, and reduction of the discharge amount of chromium in wastewater in a tanning process is facilitated by development of a titanium and zinc combined technology. In addition, by a chromium-free tanning process, treatment difficulty of waste chromium shavings generated in a production process can also be reduced.

Description

technical field [0001] The invention relates to the production field of tanning industry, in particular to alkaline protease powder produced by Bacillus alkalophilus and heavy metal-resistant protease powder produced by Bacillus amyloliquefaciens, which are pre-treated by immersion, and then used in the tanning process using titanium salt and zinc salt phase Combined methods of tanning leather, including recipes and process conditions. Background technique [0002] Chrome tanning is currently the main method of tanning leather, but the negative impact of chrome tanning on the environment has attracted more and more attention. Therefore, a series of new chrome-free tanning methods have been developed and utilized. The inorganic tanning agents used in the commonly used inorganic tanning methods include aluminum, titanium, zirconium, iron, zinc salts, etc., and it is often difficult to obtain satisfactory tanning effects with these single metal tanning agents. Combined, it ca...

Claims

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Application Information

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IPC IPC(8): C14C1/04C14C1/06C14C1/08C14C3/04
CPCC14C1/04C14C1/06C14C1/08C14C3/04
Inventor 路福平李玉曹珊程宝箴薛斌
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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