Salt-free high-chrome-absorption chrome tanning method for animal skin and application of salt-free high-chrome-absorption chrome tanning method
An animal skin, high absorption technology, applied in application, leather impregnation, chemical treatment before tanning, etc., can solve problems such as reducing product performance, affecting chromium penetration, and chromium excessively combining, improving overall performance and simplifying alkali extraction operations. , Conducive to the effect of recycling
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[0049] Example 1—Salt-free chrome high-absorption chrome tanning for cow sofa leather
[0050] After soaking, dehairing, liming, deliming and softening the cowhide used for tanning, the following two steps are carried out.
[0051] (1) Soften naked skin acid treatment
[0052] The cowhide after soaking, dehairing, liming, deliming, and softening processes is 100kg of ash-folded skin mass, put into a drum, add about 50kg of water, adjust the temperature to about 22℃, add about 1.5 naphthalenesulfonic acid kg, rotate for about 180 minutes, and then intermittently rotate, the total time is about 24 hours, soften the naked skin to be completely acidified, and control the pH of the bath to about 4.5.
[0053] (2) Chrome tanning of acidified naked skin
[0054] Add DowellorGHL (an electrolyte-resistant fatliquor, Sichuan Dawei Technology Co., Ltd.) 2.0kg, rotate for about 30 minutes, add ChromosalB (an alkalinity of 33%, Cr 2 O 3 26% chrome tanning agent, LANXESS) 4.5kg, rotate for about 180...
Example Embodiment
[0055] Example 2—Salt-free chrome high-absorption chrome tanning of yellow cattle shoe upper leather
[0056] After the yellow cowhide used for tanning is processed by water soaking, dehairing, liming, deliming, and softening, the following two steps are carried out.
[0057] (1) Soften naked skin acid treatment
[0058] After soaking, dehairing, liming, deliming, and softening processes, the cowhide is 100kg by the weight of the ash-folded skin, put into the drum, add about 40kg of water, adjust the temperature to about 20℃, and add α-naphtholsulfonate Acid 1.2kg, rotate for about 240 minutes, then intermittently rotate, the total time is about 24 hours, soften the naked skin to be completely acidified, and control the pH of the bath to about 5.0.
[0059] (2) Chrome tanning
[0060] Add DowellorGHL (an electrolyte-resistant fatliquor, Sichuan Dawei Technology Co., Ltd.) 3.0kg, rotate for 40 minutes, add ChromosalB (an alkalinity of 33%, Cr 2 O 3 A chrome tanning agent with a content ...
Example Embodiment
[0061] Example 3-Goat clothing leather salt-free chrome high-absorption chrome tanning
[0062] Goatskin used for tanning is processed through the water soaking, dehairing, liming, deliming, and softening processes, and then the following two steps are performed.
[0063] (1) Soften naked skin acid treatment
[0064] After soaking, dehairing, liming, deliming, and softening, the goatskin is 100kg in the weight of the ash-folded skin, put into a drum, add about 50kg of water, adjust the temperature to about 20℃, and add dihydroxyphenylsulfone Acid 1.2kg, rotate for about 240 minutes, and then rotate intermittently, the total time is about 24 hours, soften the naked skin to be completely acidified, and control the pH of the bath to about 5.5.
[0065] (2) Chrome tanning
[0066] Add ChromosalB (a kind of alkalinity of 33%, Cr 2 O 3 The chrome tanning agent with a content of 26% (Langxess) 3.5 kg, rotate for about 240 minutes. After the chrome tanning agent has completely penetrated into...
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