Preparation process of low-temperature-resistant anti-cracking double-layer leather
A preparation process and anti-cracking technology, applied in leather impregnation, leather surface treatment, leather punching/punching/cutting, etc., can solve problems such as poor tear strength and cracks
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Embodiment 1
[0029] A preparation process for low-temperature-resistant and anti-cracking double-layer leather, the preparation process for the low-temperature-resistant and anti-cracking double-layer leather is:
[0030] (1) Under a nitrogen atmosphere, mix anhydrous toluene, lactide, glycolide, stannous octoate and butylene glycol in a mass ratio of 5:1:1:0.04:0.02 in a reaction kettle, and heat up to 112 ℃, after reacting for 5 hours, transfer to a rotary evaporator, evaporate for 20 minutes, add chloroform with 1.5 times the mass of lactide, stir evenly and perform suction filtration to obtain the filtrate, add the same amount of methanol as the filtrate to the filtrate, and let it stand for 12 hours. The precipitate obtained is hydroxy-terminated glycidide; under nitrogen atmosphere, mix hydroxy-terminated lactide, lysine and dichloromethane at a mass ratio of 1:0.3:8, and add the mass of hydroxy-terminated glycidide 4-Dimethylaminopyridine and 1,3-diisopropylcarbodiimide of the same ...
Embodiment 2
[0037] A preparation process for low-temperature-resistant and anti-cracking double-layer leather, the preparation process for the low-temperature-resistant and anti-cracking double-layer leather is:
[0038] (1) Under a nitrogen atmosphere, mix anhydrous toluene, lactide, glycolide, stannous octoate and butylene glycol in a mass ratio of 8:1:1:0.05:0.03 in a reaction kettle, and heat up to 1124 ℃, after reacting for 6 hours, transfer to a rotary evaporator, evaporate for 25 minutes, add chloroform with 1.8 times the mass of lactide, stir evenly and perform suction filtration to obtain the filtrate, add the same amount of methanol as the filtrate to the filtrate, and let it stand for 12~ After 24 hours, the precipitate is hydroxy-terminated lactide; under nitrogen atmosphere, mix hydroxy-terminated lactide, lysine and methylene chloride at a mass ratio of 1:0.4:9, add hydroxy-terminated lactide Equal mass of 4-dimethylaminopyridine and 1,3-diisopropylcarbodiimide of equal mass...
Embodiment 3
[0045] A preparation process for low-temperature-resistant and anti-cracking double-layer leather, the preparation process for the low-temperature-resistant and anti-cracking double-layer leather is:
[0046] (1) Under nitrogen atmosphere, mix anhydrous toluene, lactide, glycolide, stannous octoate and butanediol in the reaction kettle at a mass ratio of 10:1:1:0.06:0.04, and heat up to 115 ℃, after reacting for 8 hours, transfer to a rotary evaporator, evaporate for 30 minutes, add chloroform which is 2 times the mass of lactide, stir evenly and perform suction filtration to obtain the filtrate, add the same amount of methanol as the filtrate to the filtrate, and let it stand for 24 hours. The obtained precipitate is hydroxy-terminated lactide; under nitrogen atmosphere, mix hydroxy-terminated lactide, lysine and methylene chloride at a mass ratio of 1:0.5:10, add hydroxy-terminated lactide and other mass 4-Dimethylaminopyridine and 1,3-diisopropylcarbodiimide of the same qua...
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