Leather isolating layer finishing agent, preparation method thereof, and leather

A technology of isolation layer and finishing agent, which is applied in the field of leather isolation layer finishing agent and its preparation, and can solve problems such as unfavorable operators and working environment, decreased bondability of pulp layer resin, affecting leather quality and appearance, etc.

Active Publication Date: 2019-06-14
SHANGHAI GOLD LION CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current tanning technology, before the leather softening or embossing process, it is necessary to spray the isolation layer finishing agent to prevent the leather from being polluted by oil, dust and other pollutants during the softening process and the slurry layer in the subsequent process. The adhesiveness of the resin decreases, causing the upper layer of resin to fall off when the leather meets water, which seriously affects the quality and appearance of the leather
Spraying the isolation layer finishing agent can also prevent the coating from sticking and sticking to the board during the high-temperature embossing process of the leather, which will affect the normal operation of the subsequent process and affect the quality of the leather
Currently, the coating agents for leather isolation layers used in the market are almost all nitrocellulose emulsions, and nitrocellulose emulsions are white powders that are insoluble in water. Therefore, nitrocellulose emulsions contain a large amount of organic solvents, and the amount of organic solvents exceeds the total mass of nitrocellulose emulsions. 45%, the nitrocellulose emulsion has a strong pungent smell, resulting in high VOC content (> 450g / L), and such a large amount of organic solvents volatilize into the air, which will have adverse effects on operators and working environment, and also It will cause serious pollution to the natural environment and does not meet the current environmental protection requirements

Method used

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  • Leather isolating layer finishing agent, preparation method thereof, and leather

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of water-based polyurethane: 10 parts of isophorone diisocyanate, 10 parts of polycaprolactone diol (molecular weight is 2000) and 1 part of 2,2-dimethylolpropionic acid are added to the reactor, Stir and mix evenly, heat up to 70°C and react for 4 hours, then cool down to 40°C, continue to add 1 part of triethanolamine for neutralization, then add 150 parts of water, after uniform dispersion, then add 1 part of hydrazine hydrate, stir for 1 hour, and get Water-based polyurethane containing amino groups in the end groups.

[0048] (2) Preparation of water-based epoxy resin: Add 10 parts of Tween 80 to 700 parts of water and stir evenly to obtain a mixed solution, which is added to 100 parts of epoxy resin E-44, and dispersed at a high speed to obtain a water-based epoxy resin resin.

[0049] (3) Preparation of finishing agent for leather isolation layer: take 40 parts of water-based polyurethane prepared in step (1), add 30 parts of water-based epoxy re...

Embodiment 2

[0051] (3) Preparation of water-based polyurethane: 15 parts of dicyclohexylmethane diisocyanate, 12 parts of polycaprolactone diol (molecular weight is 2000) and 1.5 parts of 2,2-dimethylolbutyric acid are added to the reactor, Stir and mix evenly, heat up to 80°C and react for 3 hours, then cool down to 45°C, continue to add 1.5 parts of triethylamine for neutralization, then add 160 parts of water, after uniform dispersion, then add 1.2 parts of diethylenetriamine, and stir for reaction After 1.5 h, the water-based polyurethane containing amino groups in the end groups was obtained.

[0052] (4) Preparation of water-based epoxy resin: Add 15 parts of Tween 80 to 750 parts of water and stir evenly to obtain a mixed solution, which is added to 150 parts of epoxy resin E-44, and dispersed at a high speed to obtain a water-based epoxy resin resin.

[0053] (3) Preparation of finishing agent for leather isolation layer: take 50 parts of water-based polyurethane prepared in step...

Embodiment 3

[0055] (5) Preparation of water-based polyurethane: 20 parts of isophorone diisocyanate, 15 parts of polycaprolactone diol (molecular weight is 2000) and 2 parts of 2,2-dimethylolpropionic acid are added to the reactor, Stir and mix evenly, heat up to 80°C and react for 2.5 hours, then cool down to 45°C, continue to add 2 parts of triethanolamine for neutralization, then add 170 parts of water, after uniform dispersion, then add 1.8 parts of hydrazine hydrate, and stir for 1.5 hours , to obtain water-based polyurethane containing amino groups in the end group.

[0056] (6) Preparation of water-based epoxy resin: Add 20 parts of Tween 80 to 800 parts of water and stir evenly to obtain a mixed solution, which is added to 200 parts of epoxy resin E-44, and dispersed at a high speed to obtain a water-based epoxy resin resin.

[0057] (3) Preparation of finishing agent for leather isolation layer: Take 60 parts of water-based polyurethane prepared in step (1), add 50 parts of wate...

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PUM

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Abstract

The invention discloses a leather isolating layer finishing agent, a preparation method thereof, and a leather. The preparation method of the leather isolating layer finishing agent comprises the following steps: reacting 10-25 parts of isocyanate, 10-20 parts of diol and 1-3 parts of a hydrophilic chain extender at 70-90 DEG C for 1-4 h, adding 0-5 parts of an organic solvent, cooling the obtained solution to 40-50 DEG C, adding 1-3 parts of an organic alkali and 150-200 parts of water, performing uniform dispersion, then adding 1-2.5 parts of an amine chain extender to extend the chain, andstirring and reacting the obtained solution for 1-2 h to obtain waterborne polyurethane containing an amino group in the terminal group; and taking 40-70 parts of the waterborne polyurethane, adding 30-60 parts of water-based epoxy resin, and stirring and reacting the obtained mixture for 3-5 h. Zero amount or a very small amount of an organic solvent is added in the preparation process of the leather isolating layer finishing agent, so the finishing agent has no irritating smell when sprayed, and has no environmental pollution; and the finishing agent is applied to the leather isolating layerto make the leather isolating layer have good wet squeegee performance and heavy pressure off-board property, and does not stick to the board.

Description

technical field [0001] The invention relates to the technical field of leather manufacturing, in particular to a leather isolation layer finishing agent, a preparation method thereof and leather. Background technique [0002] In the current tanning technology, before the leather softening or embossing process, it is necessary to spray the isolation layer finishing agent to prevent the leather from being polluted by oil, dust and other pollutants during the softening process and the slurry layer in the subsequent process. The adhesion of the resin decreases, causing the upper layer of resin to fall off when the leather meets water, which seriously affects the quality and appearance of the leather. Spraying the isolation layer finishing agent can also prevent the coating from sticking and sticking to the board during the high-temperature embossing process of the leather, which will affect the normal operation of the subsequent process and affect the quality of the leather. Cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D163/00C09D175/08C08G18/32C08G18/34C08G18/42C08G18/50C08G18/66C08G18/75
Inventor 伍一峥杨斯盛郭永彪宋天靖
Owner SHANGHAI GOLD LION CHEM CO LTD
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