Novel process for leather retanning
A new technology and leather technology, applied in the field of leather making, can solve the problems of large water consumption, land occupation, high power consumption, etc., achieve high concentration, good compatibility, and overcome tight surface knots
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Embodiment 1
[0029] Preparation of lignin protein filled retanning agent:
[0030] First, add 0-140 parts by mass of water, 270 parts of chrome leather shavings and 65 parts of sodium hydroxide into the reactor, stir for 5 minutes, add the second part of 270 parts of chrome leather shavings and 60 parts of sodium hydroxide , stirred for 5 minutes, then added 270 parts of chrome leather shavings and 60 parts of sodium hydroxide in the third part, stirred for 20 minutes, and the reactant was a uniform paste. Add 72 parts of ammonium lignosulfonate, and continue stirring for 12 hours. Then 55 parts of formic acid are added dropwise in a trickle, and the control time is 3 hours, and 100 parts of sulfuric acid are added dropwise in a trickle, and the control time is 3 hours. Check the pH value of the 1:10 aqueous solution of the reactants to be 7.5 to 8.0. It should be noted that the specific amount of water depends on the dryness and wetness of the chrome leather shavings. No water is added ...
Embodiment 2
[0041] Preparation of lignin protein filled retanning agent:
[0042] First, add 0-140 parts by mass of water, 250 parts of chrome leather shavings and 65 parts of sodium hydroxide into the reactor, stir for 5 minutes, add the second part of 250 parts of chrome leather shavings and 65 parts of sodium hydroxide , stirred for 5 minutes, then added 250 parts of the 3rd part of chrome leather shavings and 60 parts of sodium hydroxide, stirred for 20 minutes, and the reactant was a uniform paste. Add 75 parts of ammonium lignosulfonate, and continue stirring for 12 hours. Then 60 parts of formic acid are added dropwise in a trickle, and the control time is 3 hours, and then 100 parts of sulfuric acid are added dropwise in a trickle, and the control time is 3 hours. Check the pH value of the 1:10 aqueous solution of the reactants to be 7.5 to 8.0.
[0043] Retanning process:
[0044] Water washing: Put the shaved blue skin and 150% water of the weight of the blue skin into the dr...
Embodiment 3
[0051] Preparation of lignin protein filled retanning agent:
[0052] First, add 0-140 parts by mass of water, 280 parts of chrome leather shavings and 60 parts of sodium hydroxide into the reactor, stir for 5 minutes, add the second part of 280 parts of chrome leather shavings and 55 parts of sodium hydroxide , stirred for 5 minutes, then added 280 parts of the third part of chrome leather shavings and 55 parts of sodium hydroxide, stirred for 20 minutes, and the reactant was a uniform paste. Add 70 parts of ammonium lignosulfonate, and continue stirring for 12 hours. Then add 50 parts of formic acid dropwise in a trickle for a control time of 3 hours, then add 80 parts of sulfuric acid dropwise in a trickle for a control time of 3 hours. Check the pH value of the 1:10 aqueous solution of the reactants to be 7.5 to 8.0.
[0053] Retanning process:
[0054] Water washing: Put the shaved blue skin and 170% water of the weight of the blue skin into the drum, and then add 0.10...
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