A salt-free and pickling-free animal skin chrome tanning method based on the synergistic effect of complex ligands
A synergistic, animal skin technology, applied in the fields of leather chemical industry and leather clean production, can solve the problems of difficult penetration of tanning agents, high price of aromatic sulfonic acid, and inability to improve the degree of chromium crosslinking, so as to avoid the use of neutral salt , achieve direct recycling, significant market acceptability effect
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Embodiment 1
[0029] Example 1—Clean chrome tanning of cow sofa leather
[0030] The dairy cowhide used as tanning is processed through soaking, dehairing, liming, deliming, and softening processes, and then proceeds to the following two steps.
[0031] (1) Soften bare skin with polychromium ligand treatment
[0032] After soaking, dehairing, liming, deliming, and softening processes, 100kg of dairy cowhide is put into the drum, 50kg of water is added, the temperature is adjusted to 22°C, and 1.8 kg, rotated for 3 hours, the ligand penetrates evenly in the softened bare skin, and the pH value of the bath is controlled at 4.5.
[0033] (2) Pretreatment animal skin chrome tanning
[0034] Add Chromosal B (a basicity of 33%, Cr 2 o 3 Content is 26% chrome tanning agent (Lanxess company) 4.5kg, rotate 180 minutes, after chrome tanning agent has penetrated into skin completely, add 60 ℃ hot water 150kg, bath liquid temperature is 40 ℃, continue to rotate 3 hours, The pH of the bath was stab...
Embodiment 2
[0038] Example 2—Salt-free chrome high absorption chrome tanning of cattle shoe upper leather
[0039] The yellow cowhide used for tanning is processed by soaking in water, dehairing, liming, deliming, and softening, and then proceeds to the following two steps.
[0040] (1) Soften bare skin with polychromium ligand treatment
[0041]After soaking, dehairing, liming, deliming and softening processes, the dairy cow hide is 100kg in terms of the weight of gray hide, put it into the drum, add 40kg of water, adjust the temperature to 20°C, and add polychromium ligand composite material 1.2 kg, rotated for 4 hours, and then intermittently rotated for a total of 10 hours, the composite material was completely and evenly penetrated into the softened bare skin, and the pH value of the bath was controlled at 5.0.
[0042] (2) Chrome tanned
[0043] Add 3.0 kg of DowellorGHL (an electrolyte-resistant fatliquor, Sichuan Dawei Technology Co., Ltd.), rotate for 0.5 hours, add ChromosalB ...
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