阅读说明：本技术 一种环保型绒面革制备方法 (Preparation method of environment-friendly suede leather ) 是由 杨志勇 赵贵红 杨志宁 于 2019-11-29 设计创作，主要内容包括：本发明公开了一种环保型绒面革制备方法,属于皮革生产领域。包括浸水、浸灰、脱灰、浸酸、鞣制、削匀、复鞣、中和、染色加脂和干燥整理处理工艺。鞣制工艺中加入环氧硅油、异氰酸酯交联硅烷、聚氨酯交联硅胶转鼓鞣制；复鞣处理工艺加入铬复鞣剂、环氧硅油、加脂硅油、复鞣硅胶混合复鞣。本发明在鞣制和复揉工艺中加入了环氧硅油、异氰酸酯交联硅烷、聚氨酯交联硅胶,能够有效的提高各工艺添加剂的相容性,增强皮革的发泡感和柔顺性,有效提高皮革的发泡感、填充性、柔顺性、丝绒感、耐折性；相容性好,可直接进入中和和染色加脂流程,避免了水洗,降低了污水排放,节能减排；使工艺时间节省了20％；用水量节约了50％-60％。(The invention discloses a preparation method of environment-friendly suede leather, and belongs to the field of leather production. Comprises the processing technologies of soaking, liming, deliming, pickling, tanning, shaving, retanning, neutralization, dyeing and greasing and drying and finishing. Adding epoxy silicone oil, isocyanate cross-linked silane and polyurethane cross-linked silica gel into the tanning process for drum tanning; in the retanning treatment process, a chromium retanning agent, epoxy silicone oil, fatliquoring silicone oil and retanning silica gel are added for mixed retanning. According to the invention, epoxy silicone oil, isocyanate crosslinked silane and polyurethane crosslinked silica gel are added in the tanning and re-kneading processes, so that the compatibility of additives in each process can be effectively improved, the foaming feeling and flexibility of the leather are enhanced, and the foaming feeling, filling property, flexibility, velvet feeling and folding resistance of the leather are effectively improved; the compatibility is good, the dyeing and greasing process can be directly carried out, the water washing is avoided, the sewage discharge is reduced, the energy is saved, and the emission is reduced; the process time is saved by 20%; the water consumption is saved by 50-60%.)

1. The preparation method of the environment-friendly suede leather is characterized by comprising the following steps: leather is subjected to the processes of soaking, liming, deliming, pickling, tanning, shaving, retanning, neutralization, dyeing and greasing, drying and finishing to obtain suede leather;

the tanning process comprises the following steps: adding the wet leather after pickling into a rotary drum, adding warm water at 40 ℃, then adding epoxy silicone oil, isocyanate cross-linked silane and polyurethane cross-linked silica gel, rotating for 5min, adding a neutralization auxiliary agent to adjust the pH value to 7-10, and rotating for 4-6 h;

the retanning treatment process comprises the following steps: adding formic acid to adjust the pH value to 3-4 after evenly shaving; adding 2% of acid-resistant acrylic acid and 0.5% of acid-resistant grease for treatment, controlling the pH to be 3.0, adding a chromium retanning agent, epoxy silicone oil, fatliquoring silicone oil and retanning silica gel for mixed treatment for 8-12 h;

the neutralization treatment process comprises the following steps: adding 150% of water, 2% of sodium formate and 2% of neutralizing aid, rotating the rotary drum for 60min, then washing for 10min and heating to 60 ℃;

the dyeing and fat-liquoring treatment process comprises the following steps: adding 150% of water with the temperature of 40 ℃, 1.5% of dicyandiamide tannin, 2% of amphoteric synthetic tannin, 4% of tannin extract, 2% of dye, 1% of epoxy silicone oil and 2% of polyurethane crosslinked silane, rotating a drum for 50min, adding 2% of sulfonated oil, 2% of phosphate and 5% of synthetic oil, rotating the drum for 50min, adding 0.8% of formic acid, stopping the drum, and standing for 3 hours.

2. The preparation method of the environment-friendly suede leather according to claim 1, wherein the epoxy silicone oil added in the tanning process accounts for 3-4% of the leather mass; the isocyanate crosslinking silane accounts for 1-2% of the mass of the leather; 3-5% of the mass of the polyurethane cross-linked silica gel leather.

3. The method for preparing the environment-friendly suede leather according to claim 1, which is characterized in that: the epoxy silicone oil added in the re-kneading process accounts for 1-2% of the mass of the leather; the greasing silicone oil accounts for 1-2% of the mass of the leather material; the mass of the retanning silica gel is 3-4% of that of the leather.

4. The method for preparing environment-friendly suede leather according to claim 1, wherein the chrome tanning agent added in the re-kneading process accounts for 5-7% of the mass of the leather.

5. The method for preparing environment-friendly suede leather according to claim 1, wherein the treatment temperature is kept at 40 ℃ in the re-kneading process.

Technical Field

The invention relates to the field of leather production, in particular to a preparation method of environment-friendly suede leather.

Background

The suede leather is a general name of leather with a fine suede-like surface, and is a suede leather with a front surface and a meat surface, wherein part or all of grain surfaces of the suede leather are ground. The multifunctional pigskin, cowhide and sheepskin are made by chrome tanning method, and the suede leather is only sanded and dyed, and has no chemical coating, so that it has good air permeability and good flexibility. The finished suede leather product is comfortable to wear and has good sanitary performance, so that the finished suede leather product is widely applied to manufacturing leather shoes, leather clothing, leather bags, gloves and the like. The cow leather is one of the most commonly used leather raw materials in production and life, because the cow leather has relatively low price and rich sources, and leather products produced by the cow leather are firm and durable and are deeply favored by wide consumers. The cowhide suede leather is also a raw material which can be frequently seen in daily leather shoes and sports shoes. The cowhide suede leather has good performances of ventilation and sweat absorption, and can keep warm, so that the cowhide suede leather is widely used in shoe styles of spring, summer, autumn and winter. However, the leather has hard surface and not ideal hand feeling, and in order to make the cowhide suede leather have better use hand feeling, the leather is treated by a greasing process and selection of grease so as to be soft and oily. The common technological process is that the shaved leather is treated through sanding, retanning, neutralization, water washing, dyeing, greasing and fixing, then the hand feeling is treated by grease, and then the shaved leather is treated through water washing, drum discharging, milling and the like to form the leather. However, in the cowhide treatment process, due to poor compatibility of materials among the working procedures, after each working procedure is finished, water is required to be washed and changed to enter the next working procedure, namely, the leather blank can be produced after 4-5 times of water washing, so that the water consumption is increased, the working hours are prolonged, the unabsorbed materials in each working procedure, particularly the heavy metal trivalent chromium, are discharged, and meanwhile, the content of pollutants such as residual grease, filling materials, dyes and the like in the discharged liquid is high, so that the waste water treatment cost is greatly increased.

At present, various auxiliaries such as small-molecule chromium masking agents like sodium formate and sodium acetate or macromolecular organic carbon chrome tanning auxiliaries like fatty aldehyde tanning agents and acrolein modified polymer tanning agents are generally adopted to promote chromium absorption and reduce chromium consumption and chromium emission, but the carbon leather chrome tanning auxiliaries cannot well improve leather performances such as fullness, foaming feeling, filling property, flexibility, velvet feeling and folding resistance.

Disclosure of Invention

In order to solve the problems, the invention provides a preparation method of environment-friendly suede leather which can resist creasing, has good rebound resilience and can reduce sewage discharge and time.

In order to achieve the purpose, the invention is realized by the following technical scheme:

an environment-friendly suede leather preparation method comprises the steps of soaking leather in water, liming, deliming, pickling, tanning, shaving, retanning, neutralizing, dyeing, fatliquoring, drying and finishing to obtain suede leather;

the tanning process comprises the following steps: adding the wet leather after pickling into a rotary drum, adding warm water at 40 ℃, then adding epoxy silicone oil, isocyanate cross-linked silane and polyurethane cross-linked silica gel, rotating for 5min, adding a neutralization auxiliary agent to adjust the pH value to 7-10, and rotating for 4-6 h;

the retanning treatment process comprises the following steps: adding formic acid to adjust the pH value to 3-4 after evenly shaving; adding 2% of acid-resistant acrylic acid and 0.5% of acid-resistant grease for treatment, controlling the pH to be 3.0, adding a chromium retanning agent, epoxy silicone oil, fatliquoring silicone oil and retanning silica gel for mixed treatment for 8-12 h;

the neutralization treatment process comprises the following steps: adding 150% of water, 2% of sodium formate and 2% of neutralizing aid, rotating the rotary drum for 60min, then washing for 10min and heating to 60 ℃;

the dyeing and fat-liquoring treatment process comprises the following steps: adding 150% of water with the temperature of 40 ℃, 1.5% of dicyandiamide tannin, 2% of amphoteric synthetic tannin, 4% of tannin extract, 2% of dye, 1% of epoxy silicone oil and 2% of polyurethane crosslinked silane, rotating a drum for 50min, adding 2% of sulfonated oil, 2% of phosphate and 5% of synthetic oil, rotating the drum for 50min, adding 0.8% of formic acid, stopping the drum, and standing for 3 hours.

Furthermore, the epoxy silicone oil added in the tanning process accounts for 3-4% of the mass of the leather material; the isocyanate crosslinking silane accounts for 1-2% of the mass of the leather; 3-5% of the mass of the polyurethane cross-linked silica gel leather.

Further, the epoxy silicone oil added in the re-kneading process accounts for 1-2% of the mass of the leather; the greasing silicone oil accounts for 1-2% of the mass of the leather material; the mass of the retanning silica gel is 3-4% of that of the leather.

Further, the chrome tanning agent added in the re-kneading process accounts for 5-7% of the mass of the leather.

Further, the treatment temperature in the re-kneading process is kept at 40 ℃.

The preparation method of the environment-friendly suede leather has the beneficial effects that:

(1) according to the invention, epoxy silicone oil, isocyanate crosslinked silane and polyurethane crosslinked silica gel are added in the tanning process, so that the compatibility of additives in each process can be effectively improved, the foaming feeling and flexibility of the leather are enhanced, and the subsequent shaving is facilitated.

(2) Epoxy silicone oil, fatliquoring silicone oil and retanning silica gel are added in the re-kneading process, so that the foaming feeling, filling property, flexibility, velvet feeling and folding resistance of the leather can be effectively improved; meanwhile, the grease can be added, and the treated grease can directly enter the neutralization and dyeing grease adding process due to good compatibility, so that the water washing is avoided, the sewage discharge is reduced, the energy is saved, and the emission is reduced; the process time is saved by 20%; the water consumption is saved by 50-60%.

Detailed Description

The present invention will be described in further detail with reference to the following examples.