Method for raising thermal denaturation temperature of hide and hide powder through THP salt-nano clay combination tannage
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A nano-clay, combined tanning technology, used in small raw hides/large raw hides/leather/fur treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, chemical treatment before tanning, etc.
Inactive Publication Date: 2010-04-21
SICHUAN UNIV
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Embodiment 1
[0014] 1) pickling: add leather powder and water with a weight ratio of 0.5:1 into the reactor, add 6% NaCl, stir for 20 minutes, then add formic acid to adjust the pH value to 3.8, and stir for 30 minutes;
[0015] 2) Tanning: add 2% THP salt, stir for 3h, then add 5% nanoclay, stir for 3.5h;
[0016] 3) Elevation of base: adding sodium bicarbonate solution in 4 times to adjust the pH of the tanning bath to 5.6, the time of base extraction is 3 hours, then continue to mechanically stir for 2 hours, and then stand overnight. After stirring for 30 minutes the next day, wash with water.
Embodiment 2
[0018] 1) Pickling: Add softened skin and water with a weight ratio of 0.8:1 into the drum, add 6% NaCl, rotate for 20 minutes, then add formic acid to adjust the pH to 3.6, and rotate for 30 minutes;
[0019] 2) Tanning: add 2.5% THP salt, rotate for 3.5 hours, then add 8% nanoclay, rotate for 5 hours;
[0020] 3) Alkali extraction: add sodium acetate solution in 4 times to adjust the pH of the tanning bath to 5.8, and the alkali extraction time is 3 hours, then continue mechanical stirring for 2 hours, and then stand overnight. The next day, turn it for 30 minutes and wash it with water.
Embodiment 3
[0022] 1) Pickling: Add softened skin powder and water with a weight ratio of 0.6:1 into the reactor, add 7% NaCl, stir for 20 minutes, then add formic acid to adjust the pH value to 3.5, and stir for 30 minutes;
[0023] 2) Tanning: add 1.5% THP salt, stir for 3 hours, then add 4% nanoclay, stir for 3 hours;
[0024] 3) Elevation of alkali: add sodium bicarbonate solution in 4 times to adjust the pH of the tanning bath to 5.5, and the alkali extraction time is 3 hours, then continue to mechanically stir for 2 hours, and then stand overnight. After stirring for 30 minutes the next day, wash with water.
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Abstract
The invention discloses a method for raising thermal denaturation temperature of hide and hide powder through THP salt-nano clay combination tannage. The method comprises: adding softened hide or hide powder and water in a mass ratio of (0.5-1):1 to a reactor; adding a certain amount of salt and formic acid; adding THP salt and stirring for 3 to 5 hours; adding nano clay and stirring for 3 to 5 hours; extracting alkali till the pH of bath is between 5.0 and 6.0, continuing to stir for 2 hours and then standing the obtained product overnight; and stirring the obtained product for 30 minutes next day and then performing washing. The method can effectively raise the thermal denaturation temperature of hide collagen up to over 115 DEG C through the THP salt-nano clay combination tannage. Due to the specific structure of the nano clay added in the method, during alkali extraction in the later stage of tanning, tanning liquor is automatically alkalized and mitigated in effect, thereby helping to stabilize product quality, and the consumption of alkalization agent can be reduced. Meanwhile, the THP salt and the nano clay in the method containing no heavy metal salts are environment-friendly materials, and the tanning process is a clean leather-making technique.
Description
technical field [0001] The invention relates to a leather tanning method, in particular to a THP salt-nanometer clay combined tanning method for increasing the thermal denaturation temperature of leather and leather powder. Background technique [0002] Since the chrome tanning method came out in 1858, it has been widely recognized by the tannery industry for its excellent tanning performance, simple operation process and excellent performance of finished leather, and has occupied a dominant position in the production of light leather. However, with the development of the global economy and the progress of society, chromium pollution, especially the panic about carcinogenic Cr(VI), and the safety problems of wearing chrome-tanned leather products and the disposal of waste chrome-tanned leather products have become increasingly popular. focus on. Therefore, it is a new trend in the development of the leather industry to develop a new type of tanning agent and its tanning met...
Claims
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