Comprehensive utilization method of leather castoff
A waste and leather technology, applied in the field of leather production, can solve the problems of low utilization rate, high cost, hazards, etc., and achieve the effects of no secondary pollution, simple method, and improved bonding and filling effects
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Embodiment 1
[0036] 200 parts by weight of evenly shaved chrome chips, 1000 parts by weight of water, and 12 parts by weight of sulfuric acid were hydrolyzed at 90°C for 2.5 hours, filtered, and the pH value of the filtrate was adjusted to about 7 with sodium hydroxide, and the collagen hydrolyzate Concentrate to a solid content of about 50%.
[0037] Mix 15 parts by weight of water, 10 parts by weight of melamine, 4 parts by weight of urea, 1 part by weight of triethanolamine and 40 parts by weight of a 37% formaldehyde solution, heat up to 55°C, react for 2 hours, and then add 150 parts by weight of the concentrated The collagen hydrolyzate was reacted for 2 hours and the pH value of the reaction system was maintained at 7-8 with triethanolamine, and the modified collagen hydrolyzate was obtained by cooling.
[0038] Shaved wet blue leather, weighed, used as the basis weight for the following quantities:
[0039]Rehumidification: 150% water, 35°C, 1.5% degreaser, rotate for 30 minutes, ...
Embodiment 2
[0046] 200 parts by weight of evenly shaved chrome chips, 1000 parts by weight of water, and 14 parts by weight of sulfuric acid were hydrolyzed at 95°C for 1.5 hours, filtered, and the pH value of the filtrate was adjusted to about 7 with sodium hydroxide, and the collagen hydrolyzate Concentrate to a solid content of about 50%.
[0047] Mix 15 parts by weight of water, 10 parts by weight of melamine, 4 parts by weight of urea, 1 part by weight of triethanolamine and 40 parts by weight of a 37% formaldehyde solution and heat up to 60°C, react for 1.5 hours, and then add 150 parts by weight of the concentrated The collagen hydrolyzate was reacted for 2 hours and the pH value of the reaction system was maintained at 7-8 with triethanolamine, and the modified collagen hydrolyzate was obtained by cooling.
[0048] Shaved wet blue leather, weighed, used as the basis weight for the following quantities:
[0049] Rehumidification: 150% water, 35°C, 1.5% degreaser, rotate for 30 min...
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