Preparation method of environmentally-friendly suede leather

Abstract

The invention discloses a preparation method of environment-friendly suede leather, and belongs to the field of leather production. The method comprises the treatment processes of soaking in water, liming, deliming, pickling, tanning, shaving, retanning, neutralizing, dyeing and fat liquoring, and drying and finishing. Epoxy silicone oil, isocyanate crosslinked silane and polyurethane crosslinkedsilica gel are added in the tanning process, and drum tanning is performed; and a chromium retanning agent, epoxy silicone oil, fat liquoring silicone oil and retanning silica gel are added in the retanning treatment process, and mixing retanning is carried out. The epoxy silicone oil, isocyanate crosslinked silane and polyurethane crosslinked silica gel are added in tanning and retanning processes, so that the compatibility of all process additives can be effectively improved, the foaming feeling and the flexibility of leather are enhanced, and the foaming feeling, the filling property, the flexibility, the velvet feeling and the folding resistance of the leather are effectively improved; and the leather has good compatibility, and can directly enters neutralizing, dyeing and fat liquoring processes without water washing, so sewage discharge is reduced, energy conservation and emission reduction are achieved, the process time is shortened by 20%, and the water consumption is reduced by 50-60%.

Description

technical field

[0001] The invention relates to the field of leather production, in particular to an environment-friendly suede preparation method. Background technique

[0002] Suede is a general term for leather that has been ground to a fine suede, with some or all of the grain on the front nubuck and the suede on the flesh side. Pigskin, cowhide, and sheepskin are mostly made by chrome tanning. Because suede leather is only sanded and dyed without chemical coating, it has excellent air permeability and good softness. The suede products are comfortable to wear and have good hygienic performance, so they are widely used in the production of leather shoes, leather garments, leather bags, gloves, etc. Cowhide is one of the most commonly used leather raw materials in production and life, because its price is relatively cheap, the source is abundant, and the leather products produced from cowhide leather are durable and popular among consumers. Cowhide suede is also a raw ma...

Examples

Embodiment 1

[0020] A preparation method for environment-friendly suede leather, which comprises the steps of immersing leather in water, liming, deliming, pickling, tanning, smoothing, retanning, neutralization, dyeing and fatliquoring, and drying to obtain suede;

[0021] The purpose of water immersion treatment is to restore the lost moisture of the treated raw hides to the state of fresh hides, which is beneficial to the subsequent process operations, and to remove soil, dirt (such as feces, etc.) and preservatives (such as salt, etc.) on the raw hides. The process steps are to soak the leather in the prepared solution, turn the drum for 30 minutes and stop for 15 minutes at an appropriate temperature, repeat 4 times, and stop the drum overnight. The next day, check for waterlogging, then drain and remove the flesh.

[0022] The purpose of liming treatment is to expand the bare skin, loosen the woven structure of collagen fibers, further remove the fibrous interstitium, remove the resi...

Embodiment 2

[0036] A preparation method for environment-friendly suede leather, which comprises the steps of immersing leather in water, liming, deliming, pickling, tanning, smoothing, retanning, neutralization, dyeing and fatliquoring, and drying to obtain suede;

[0037] The tanning process includes: adding the wet hide after pickling into the drum, adding warm water at 40°C, adding 4% epoxy silicone oil, 2% isocyanate cross-linked silane, and 5% polyurethane cross-linked silica gel for 5 minutes, and then turning it on for 5 minutes. Add neutralization aid to adjust the pH value to 7-10, and rotate for 4-6h;

[0038]The retanning treatment process includes: adding formic acid to adjust the pH value to 3-4 after shaving; adding 2% acid-resistant acrylic acid and 0.5% acid-resistant oil for treatment, controlling the pH to 3.0, adding 7% chrome retanning agent, 2% epoxy silicone oil, 2% fatliquor silicone oil, 4% retanned silica gel, mixed at 40°C for 8-12 hours;

[0039] The neutraliza...

Embodiment 3

[0042] A preparation method for environment-friendly suede leather, which comprises the steps of immersing leather in water, liming, deliming, pickling, tanning, smoothing, retanning, neutralization, dyeing and fatliquoring, and drying to obtain suede;

[0043] The tanning process includes: adding the wet leather after pickling into the drum, adding warm water at 40°C, adding 3% epoxy silicone oil, 2% isocyanate cross-linked silane, and 4% polyurethane cross-linked silica gel for 5 minutes. Add neutralization aid to adjust the pH value to 7-10, and rotate for 4-6h;

[0044] The retanning treatment process includes: adding formic acid to adjust the pH value to 3-4 after shaving; adding 2% acid-resistant acrylic acid and 0.5% acid-resistant oil for treatment, controlling the pH to 3.0, adding 7% chrome retanning agent, 1% epoxy silicone oil, 2% fatliquor silicone oil, 4% retanned silica gel, mixed at 40°C for 8-12 hours;

[0045] The neutralization treatment process includes: a...

technical field

[0001] The invention relates to the field of leather production, in particular to an environment-friendly suede preparation method. Background technique

[0002] Suede is a general term for leather that has been ground to a fine suede, with some or all of the grain on the front nubuck and the suede on the flesh side. Pigskin, cowhide, and sheepskin are mostly made by chrome tanning. Because suede leather is only sanded and dyed without chemical coating, it has excellent air permeability and good softness. The suede products are comfortable to wear and have good hygienic performance, so they are widely used in the production of leather shoes, leather garments, leather bags, gloves, etc. Cowhide is one of the most commonly used leather raw materials in production and life, because its price is relatively cheap, the source is abundant, and the leather products produced from cowhide leather are durable and popular among consumers. Cowhide suede is also a raw ma...

Examples

Embodiment 1

[0020] A preparation method for environment-friendly suede leather, which comprises the steps of immersing leather in water, liming, deliming, pickling, tanning, smoothing, retanning, neutralization, dyeing and fatliquoring, and drying to obtain suede;

[0021] The purpose of water immersion treatment is to restore the lost moisture of the treated raw hides to the state of fresh hides, which is beneficial to the subsequent process operations, and to remove soil, dirt (such as feces, etc.) and preservatives (such as salt, etc.) on the raw hides. The process steps are to soak the leather in the prepared solution, turn the drum for 30 minutes and stop for 15 minutes at an appropriate temperature, repeat 4 times, and stop the drum overnight. The next day, check for waterlogging, then drain and remove the flesh.

[0022] The purpose of liming treatment is to expand the bare skin, loosen the woven structure of collagen fibers, further remove the fibrous interstitium, remove the resi...

Embodiment 2

[0036] A preparation method for environment-friendly suede leather, which comprises the steps of immersing leather in water, liming, deliming, pickling, tanning, smoothing, retanning, neutralization, dyeing and fatliquoring, and drying to obtain suede;

[0037] The tanning process includes: adding the wet hide after pickling into the drum, adding warm water at 40°C, adding 4% epoxy silicone oil, 2% isocyanate cross-linked silane, and 5% polyurethane cross-linked silica gel for 5 minutes, and then turning it on for 5 minutes. Add neutralization aid to adjust the pH value to 7-10, and rotate for 4-6h;

[0038]The retanning treatment process includes: adding formic acid to adjust the pH value to 3-4 after shaving; adding 2% acid-resistant acrylic acid and 0.5% acid-resistant oil for treatment, controlling the pH to 3.0, adding 7% chrome retanning agent, 2% epoxy silicone oil, 2% fatliquor silicone oil, 4% retanned silica gel, mixed at 40°C for 8-12 hours;

[0039] The neutraliza...

Embodiment 3

[0042] A preparation method for environment-friendly suede leather, which comprises the steps of immersing leather in water, liming, deliming, pickling, tanning, smoothing, retanning, neutralization, dyeing and fatliquoring, and drying to obtain suede;

[0043] The tanning process includes: adding the wet leather after pickling into the drum, adding warm water at 40°C, adding 3% epoxy silicone oil, 2% isocyanate cross-linked silane, and 4% polyurethane cross-linked silica gel for 5 minutes. Add neutralization aid to adjust the pH value to 7-10, and rotate for 4-6h;

[0044] The retanning treatment process includes: adding formic acid to adjust the pH value to 3-4 after shaving; adding 2% acid-resistant acrylic acid and 0.5% acid-resistant oil for treatment, controlling the pH to 3.0, adding 7% chrome retanning agent, 1% epoxy silicone oil, 2% fatliquor silicone oil, 4% retanned silica gel, mixed at 40°C for 8-12 hours;

[0045] The neutralization treatment process includes: a...