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A pickling-free and chrome-free tanning technology, which is applied in chemical treatment before tanning, small hide/big hide/leather/fur treatment, tanning treatment, etc., to achieve the effects of saving resources, reducing pollution and shortening the process flow
Active Publication Date: 2016-09-07
JIAXING UNIV
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Problems solved by technology
But so far, there is no complete chrome-free tanning method to produce finished leather that meets or approaches the requirements of current chrome-tanned leather
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Embodiment 1
[0048] (1) Immersion, depilation, and liming, which are equivalent to traditional processes
[0049] (2) Ammonia-free deashing and softening
[0050] Take 100 kg of caustic soda skin and put it into the drum, add 50 kg of water at a temperature of 30°C, 0.2 kg of formic acid, 1.5 kg of lactic acid, and 1 kg of propionic acid, rotate for 120 minutes, pH is 8; use 1 kg of neutral protease, Spin for 120 minutes, wash with water.
[0051] (3) Non-chrome tanning agent tanning
[0052] Method 1: Use 50 kg of water with a temperature of 18 ° C, add 4 kg of non-chrome tanning agent I in the drum, rotate for 2 hours, then add 1.0 to 1.6 parts of baking soda (dilute with 10 times of water, add in 4 times drum, a total of 60 minutes), adjust the pH value of the acid solution to 7.0, and then add water at 50 ° C, make the temperature in the drum to 35 ° C, and rotate for 220 minutes.
[0053] Method 2: Use 30 kg of water at a temperature of 32 °C, add 8 kg of non-chrome tanning agent I...
Embodiment 2
[0065] (1) Immersion, depilation, and liming, which are equivalent to traditional processes
[0066] (2) Ammonia-free deashing and softening
[0067] Take 100 kg of caustic soda peel and put it into the drum, add 100 kg of water at a temperature of 33°C, 0.5 kg of formic acid, and 3.5 kg of deliming aid, rotate for 150 minutes, and adjust the pH to 8.5; use 1.5 kg of neutral protease, rotate 150 minutes, wash with water.
[0068] (3) Non-chrome tanning agent tanning
[0069] Method 1: Use 100 kg of water with a temperature of 22 ° C, add 6 kg of non-chrome tanning agent I in the drum, rotate for 3 hours, then add 1.0 to 1.6 parts of baking soda (diluted with 10 times of water, add in 4 times to rotate drum, a total of 60 minutes), adjust the pH value of the acid solution to 7.5, and then add water at 60 ° C, make the temperature in the drum to 45 ° C, and rotate for 280 minutes.
[0070] Method 2: Use 50 kg of water at a temperature of 35 °C, add 10 kg of non-chrome tanning...
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Abstract
The invention discloses a no-salt pickling-free short-process no-chrome tanning method. One the basis of advantages and disadvantages of chrome and requirements for environment protection, the no-salt pickling-free no-chrome tanning method suitable for production and feasible is needed at the present, and the finished leather quality of the method can be favorably compared with that of a traditional chrome tanning technology. The no-salt pickling-free short-process no-chrome tanning method comprises the steps that softened naked leather is directly tanned with no-chrome tanning agents to obtain wet white leather; the uniformly shaved wet white leather is tanned with substitute type synthetic tanning agents, then tanned with vegetable tanning agents and finally tanned with a defined amount of aluminum tanning agents; and a no-salt pickling-free no-chrome tanning leather blank is obtained. According to the no-salt pickling-free short-process no-chrome tanning method, the shrinkage temperature of the obtained no-chrome tanning crust leather is higher than 95 DEG C, and a body of the finished leather is soft and rich and capable of being favorably compared with chrome tanning leather in the quality, performance and other aspects; and meanwhile, the pickling process is omitted, the tanning time is shortened, and the consumption of sodium chloride and chrome salt in the leather production process and the pollution of the sodium chloride and the chrome salt to human and the environment are eradicated.
Description
technical field [0001] The invention relates to the field of leather tanning, in particular to a salt-free pickling-free short-process chrome-free tanning method. Background technique [0002] Chrome tanned leather has good comprehensive properties, so the chrome tanning method has been dominant in the tanning industry since its invention, but the chrome tanning process is also one of the processes that cause environmental pollution in the tanning process. The wastewater produced by my country's tanning industry contains 1,300 tons of total chromium each year, which makes it difficult to control the sewage to meet the standard. At the same time, there is also pollution caused by chromium-containing solid waste. In addition, before the traditional chrome tanning, a pickling process is required, and a large amount of industrial salt is added to prevent the acid swelling of the bare hide, resulting in the chloride ion content in the chrome tanning wastewater reaching 30,000-40,...
Claims
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Application Information
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