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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

Pending Publication Date: 2022-04-26
威尔尼装饰材料(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, with the development of society, single-layer leather is often unable to meet people's daily needs. For example, cracks will appear after short-term use in low-temperature environments, and the tear strength is poor.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a preparation process of low-temperature-resistant anti-cracking double-layer leather, and relates to the technical field of leather production. When the low-temperature-resistant anti-cracking double-layer leather is prepared, cattle hide serves as base cloth, the base cloth is sequentially tanned and re-tanned to form a first layer, then the base cloth is smashed, epoxy resin is added into the base cloth, the base cloth is rolled to form a second layer, the first layer and the second layer are coated with modified polyurethane, and the first layer and the second layer are pressed under ultraviolet light to form the low-temperature-resistant anti-cracking double-layer leather. During tanning and retanning, amino-terminated lactic-co-glycolide is used as a tanning agent, hydroxyl-terminated lactic-co-glycolide is used as a retanning agent, the tearing strength of the leather is improved, and free formaldehyde can be removed; silicon-oxygen bonds are introduced into the modified polyurethane, so that the low-temperature resistance is enhanced, and the cracking resistance of the double-layer leather is enhanced by curing and pressing under ultraviolet light.

Description

technical field [0001] The invention relates to the technical field of leather production, in particular to a preparation process of low-temperature-resistant and crack-resistant double-layer leather. Background technique [0002] Leather is composed of natural protein fibers tightly woven in three-dimensional space. There is a special grain layer on the surface, which has natural grain and luster, and feels comfortable. In the process of human evolution, people found that some plant juices or mineral oils have certain tanning properties on leather, and raw leather is more breathable and antiseptic after being soaked in juice. So that the board has physical and chemical properties such as softness, tear resistance, and bending resistance. The leather of this period really has the characteristics of leather products. [0003] However, with the development of society, single-layer leather is often unable to meet people's daily needs. For example, cracks will appear after sho...

Claims

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Application Information

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IPC IPC(8): C14C3/28C14B5/00C14C11/00C14C9/04
CPCC14C3/28C14B5/00C14C11/003C14C9/04
Inventor 徐伟
Owner 威尔尼装饰材料(江苏)有限公司
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