Study on Retanning Process of Vegetable-zeolite Combination Based on Orthogonal Design
In order to improve the shrinkage temperature and physical and mechanical properties of TWS tanning white wet leather,the amount of zeolite tanning agent,the rotation time,the neutralize pH and the fixing temperature were taken as the influencing factors,the shrinkage temperature and mechanical properties of leather crust were investigated.The orthogonal test was designed to optimize the retanning process with vegetable-zeolite combination.The results showed that:the amount of zeolite tanning agent had a decisive effect on the shrinkage temperature,the rotation time had the greatest effect on the tensile strength and the bursting strength,and the pH had the greatest effect on the tearing strength.The optimum process parameters were as follows:5％BS,3 hours rotating time,pH 5.5,30℃ fixed temperature,yielding leather with a shrinkage temperature threshold of 89.5 ℃,a tear resistance of 75.00 N·mm-1,a tensile strength of 11.53 N·mm-2,and a burst strength or bursting strength of 205.69 N·mm-1.It has important reference significance for the retanning process design of chrome-free ecological leather.
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