CN113832263B - Production method of buffalo hide instead of buffalo hide - Google Patents
Production method of buffalo hide instead of buffalo hide Download PDFInfo
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- CN113832263B CN113832263B CN202111289606.8A CN202111289606A CN113832263B CN 113832263 B CN113832263 B CN 113832263B CN 202111289606 A CN202111289606 A CN 202111289606A CN 113832263 B CN113832263 B CN 113832263B
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
- C14C1/04—Soaking
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
- C14C1/06—Facilitating unhairing, e.g. by painting, by liming
- C14C1/065—Enzymatic unhairing
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C1/00—Chemical treatment prior to tanning
- C14C1/08—Deliming; Bating; Pickling; Degreasing
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/28—Multi-step processes
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
- C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
Abstract
The invention discloses a buffalo hide production method for replacing buffalo hide, which sequentially comprises the following steps: pre-soaking, main soaking, liming, deliming, softening, pickling, shaving, retanning, neutralizing, dyeing, fatliquoring and drying and finishing; the method has the advantages that fibers in the buffalo hide can be fully dispersed, the buffalo hide can be ensured to keep good elasticity, and the leather is smooth and transparent and moderate, so that the physical and mechanical properties of the buffalo hide crust leather are improved, and finally the use effect which is comparable with that of the buffalo hide is achieved; meanwhile, the production cost is reduced, and the utilization value of the buffalo hide in the leather industry is also solved; the soft cattle upper leather prepared from the advanced leather materials has excellent fullness and elasticity and soft and comfortable hand feeling, remarkably improves the physical properties of the leather, reduces loose leather and meets the requirements of people.
Description
Technical Field
The invention relates to a buffalo hide production method, in particular to a buffalo hide production method replacing buffalo hide.
Background
The natural leather is widely applied to produce products such as clothes, shoes, bags and the like, and is favored by consumers due to the comfort and the beauty. Nearly 20 kinds of natural leather are used for batch production, and the price difference is very different due to different kinds of the natural leather. The market is full of artificial leather and fake natural leather, and phenomena such as low-price natural leather and fake high-price natural leather disturb the market order and damage the rights and interests of consumers. Wherein, the cow leather is the one with the largest yield and the widest application range in natural leather. The cattle and buffalo are the main raw materials for manufacturing cattle leather in China.
The buffalo hide is mainly characterized by small width, special thick hide, uneven thickness, rough grain surface, large pores on the surface, uneven pore size of each part of the hide, loose plush, thin pores, loose cortex and relatively weak hide tearing strength. The main production and development products of the cowhide are the cowhide, in recent years, the price of the cowhide is high, the operating cost of the company is continuously increased, and the price of the cowhide is lower because the leather of the cowhide is poor and cannot be widely applied to leather products.
Disclosure of Invention
The invention aims to solve the problems and provides a buffalo hide production method for replacing buffalo hide, which sequentially comprises the following steps: pre-soaking, main soaking, liming, deliming, softening, pickling, chrome tanning, shaving, retanning, neutralizing, dyeing, fatliquoring, drying and finishing;
pre-soaking: putting the raw hide into a rotary drum, adding water, a water soaking agent BH-C, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 30-40 minutes, stopping for 20 minutes, circulating for more than 2 times, and then taking out the raw hide from the drum to remove flesh;
soaking: adding water, a soaking agent, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 15-20 minutes, stopping for 10 minutes, circulating for more than 2 times, then adding soda ash, rotating for 15-20 minutes, stopping for 10 minutes, circulating for more than 2 times, rotating for 5-10 minutes every 2 hours, and controlling the pH value to be 9.2-9.5 for 21-23 hours;
liming: mixing raw hide, water and liming enzyme, and then adding a liming auxiliary agent, lime, an expanding agent and sodium hydrosulfide, wherein the weight ratio of the raw hide to the liming auxiliary agent to the lime to the expanding agent is 100: 0.2-0.3: 0.5-0.6: 0.1;
deliming: hydrolyzing hair, shavings, trimmings or feathers in an inorganic acid solution to produce an amino acid or amino acid salt, then obtaining a protein hydrolysate, and neutralizing the filtrate with an ammonium-free basic compound to a pH of 4-6 to obtain a protein hydrolysate solution;
softening: adding water, ammonium sulfate and ORAPON softening enzyme into the rotary drum, rotating for 120-360 minutes, and washing after completely softening;
pickling: adding water and salt into the rotary drum, rotating for 15 minutes, adding formic acid, rotating for 30 minutes, adding sulfuric acid for 3 times at intervals of 20 minutes every time, rotating for 130-140 minutes after the addition is finished, controlling the pH value to be 2.2-2.6, and then performing chrome tanning;
chrome tanning: adding 150 parts by mass of water into 100 parts of leather, adding 3 parts by mass of white tannin and 5 parts by mass of phenolic synthetic leather agent at the temperature of 34-35 ℃, rotating for 60 minutes in a rotary drum, adding 3 parts by mass of macromolecular acrylic acid and 2 parts by mass of medium molecular acrylic acid, rotating for 60 minutes in the rotary drum, adding 5 parts by mass of chromium powder, 2 parts by mass of chromium-containing tannin and 1 part by mass of anti-tear grease, rotating for 60 minutes in the rotary drum, adding 1.5 parts by mass of sodium formate, rotating for 30 minutes in the rotary drum, adding 0.5 part by mass of baking soda, rotating for 60 minutes in the rotary drum, adding 50 parts by mass of 40-degree hot water, and rotating for 12-24 hours in the rotary drum;
shaving: after the acid-soaked leather is subjected to sanding, the leather is rubbed after being coated with grease, so that the leather has uniform hand feeling;
retanning: adding 20-100 parts by mass of mixed liquor of glutaraldehyde and a synthetic tanning agent, 1-5 parts by mass of a masking agent and 3-5 parts by mass of a fatting agent into 100 parts of skin, respectively dissolving the mixed liquor of the masking agent, the glutaraldehyde and the synthetic tanning agent by water at 45-50 ℃, preparing an acid-base regulator solution from the acid-base regulator by using water, regulating the temperature to 45-50 ℃, adding the mixed liquor of the glutaraldehyde and the synthetic tanning agent, the masking agent and the fatting agent, and regulating the pH value of the mixed liquor to 2-4 by adding the acid-base regulator solution;
neutralizing: adding alkaline compound to neutralize the filtrate to water solution with pH value of 6.5-7.5;
dyeing and fat liquoring: adding a coloring agent and a fatting agent for dyeing and fatting;
drying and finishing: and finally, drying.
Further, pre-soaking: putting the raw hide into a rotary drum, adding water, a water soaking agent BH-C, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 35 minutes, stopping for 20 minutes, circulating for 4 times, and then taking out the drum to remove meat.
Further, soaking: and adding water, a soaking agent, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 17 minutes, stopping for 10 minutes, circulating for 4 times, then adding soda ash, rotating for 17 minutes, stopping for 10 minutes, circulating for 4 times, rotating for 8 minutes every 2 hours, controlling the pH value to be 9.4, and totally 21-23 hours.
Further, softening: softening: adding water, ammonium sulfate and ORAPON softening enzyme into the rotary drum, rotating for 320 min, and washing with water after completely softening.
Further, pickling: adding water and salt into the rotary drum, rotating for 15 minutes, adding formic acid, rotating for 30 minutes, adding sulfuric acid for 3 times at intervals of 20 minutes every time, rotating for 130-140 minutes after the addition is finished, controlling the pH value to be 2.2-2.6, and then performing chrome tanning.
Further, retanning: adding 50-100 parts by mass of mixed liquor of glutaraldehyde and a synthetic tanning agent, 1-3 parts by mass of a masking agent and 3-4 parts by mass of a fatting agent into 100 parts of skin, respectively dissolving the mixed liquor of the masking agent, the glutaraldehyde and the synthetic tanning agent by using water at 46-48 ℃, preparing an acid-base regulator solution from the acid-base regulator by using water, regulating the temperature to 46-48 ℃, adding the mixed liquor of the glutaraldehyde and the synthetic tanning agent, the masking agent and the fatting agent, and regulating the pH value of the mixed liquor to 3 by adding the acid-base regulator solution;
further, neutralization: the filtrate was neutralized to an aqueous solution of pH 7 by the addition of a basic compound.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention relates to a buffalo hide production method for replacing buffalo hide, which can be used for better treating the surface and the interior of the buffalo hide to dissolve plasma protein and non-collagen protein in the buffalo hide by combining pre-soaking, main soaking, liming, deliming, softening, pickling and tanning agents and post-treatment processes with related treatment reagents so as to play a role in cleaning the buffalo hide.
2. The method for producing the buffalo hide instead of the buffalo hide not only solves the problems that the buffalo hide has loose cortex, low strength, poor air permeability and the like, and the buffalo hide can achieve the characteristics of soft hand feeling, good tearing strength, good air permeability and the like of the buffalo hide after being made into leather, but also reduces the production cost and solves the utilization value of the buffalo hide in the leather industry.
3. According to the buffalo hide production method for replacing buffalo hide, the buffalo soft upper leather prepared from advanced leather materials has excellent fullness and elasticity and soft and comfortable handfeel, the physical properties of the leather are obviously improved, loose faces are reduced, and the requirements of people are met.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below.
The core of the invention is to provide a buffalo hide production method for replacing buffalo hide, which sequentially comprises the following steps: pre-soaking, main soaking, liming, deliming, softening, pickling, shaving, retanning, neutralizing, dyeing, fatliquoring and drying and finishing;
pre-soaking: putting the raw hide into a rotary drum, adding water, a water soaking agent BH-C, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 30-40 minutes, stopping for 20 minutes, circulating for more than 2 times, and then taking out the raw hide from the drum to remove flesh;
soaking: adding water, a soaking agent, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 15-20 minutes, stopping for 10 minutes, circulating for more than 2 times, then adding soda ash, rotating for 15-20 minutes, stopping for 10 minutes, circulating for more than 2 times, rotating for 5-10 minutes every 2 hours, and controlling the pH value to be 9.2-9.5 for 21-23 hours;
liming: mixing raw hide, water and liming enzyme, and then adding a liming auxiliary agent, lime, an expanding agent and sodium hydrosulfide, wherein the weight ratio of the raw hide to the liming auxiliary agent to the lime to the expanding agent is 100: 0.2-0.3: 0.5-0.6: 0.1;
deliming: hydrolyzing hair, shavings, trimmings or feathers in an inorganic acid solution to produce an amino acid or amino acid salt, then obtaining a protein hydrolysate, and neutralizing the filtrate with an ammonium-free basic compound to a pH of 4-6 to obtain a protein hydrolysate solution;
softening: adding water, ammonium sulfate and ORAPON softening enzyme into the rotary drum, rotating for 120-360 minutes, and washing after completely softening;
pickling: adding water and salt into the rotary drum, rotating for 15 minutes, adding formic acid, rotating for 30 minutes, adding sulfuric acid for 3 times at intervals of 20 minutes every time, rotating for 130-140 minutes after the addition is finished, controlling the pH value to be 2.2-2.6, and then performing chrome tanning.
Chrome tanning: adding 150 parts by mass of water into 100 parts of leather, adding 3 parts by mass of white tannin and 5 parts by mass of phenolic synthetic leather agent at the temperature of 34-35 ℃, rotating for 60 minutes in a rotary drum, adding 3 parts by mass of macromolecular acrylic acid and 2 parts by mass of medium molecular acrylic acid, rotating for 60 minutes in the rotary drum, adding 5 parts by mass of chromium powder, 2 parts by mass of chromium-containing tannin and 1 part by mass of anti-tear grease, rotating for 60 minutes in the rotary drum, adding 1.5 parts by mass of sodium formate, rotating for 30 minutes in the rotary drum, adding 0.5 part by mass of baking soda, rotating for 60 minutes in the rotary drum, adding 50 parts by mass of 40-degree hot water, and rotating for 12-24 hours in the rotary drum;
shaving: after the acid-soaked leather is subjected to sanding, the leather is rubbed after being coated with grease, so that the leather has uniform hand feeling;
retanning: adding 20-100 parts by mass of mixed liquor of glutaraldehyde and a synthetic tanning agent, 1-5 parts by mass of a masking agent and 3-5 parts by mass of a fatting agent into 100 parts of skin, respectively dissolving the mixed liquor of the masking agent, the glutaraldehyde and the synthetic tanning agent by water at 45-50 ℃, preparing an acid-base regulator solution from the acid-base regulator by using water, regulating the temperature to 45-50 ℃, adding the mixed liquor of the glutaraldehyde and the synthetic tanning agent, the masking agent and the fatting agent, and regulating the pH value of the mixed liquor to 2-4 by adding the acid-base regulator solution;
neutralizing: adding alkaline compound to neutralize the filtrate to water solution with pH value of 6.5-7.5;
dyeing and fat liquoring: adding a coloring agent and a fatting agent for dyeing and fatting;
drying and finishing: and finally, drying.
Specifically, the pre-soaking step: putting the raw hide into a rotary drum, adding water, a water soaking agent BH-C, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 35 minutes, stopping for 20 minutes, circulating for 4 times, and then taking out the drum to remove meat.
Specifically, soaking: and adding water, a soaking agent, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 17 minutes, stopping for 10 minutes, circulating for 4 times, then adding soda ash, rotating for 17 minutes, stopping for 10 minutes, circulating for 4 times, rotating for 8 minutes every 2 hours, controlling the pH value to be 9.4, and totally 21-23 hours.
Specifically, softening: softening: adding water, ammonium sulfate and ORAPON softening enzyme into the rotary drum, rotating for 320 min, and washing with water after completely softening.
Specifically, pickling: adding water and salt into the rotary drum, rotating for 15 minutes, adding formic acid, rotating for 30 minutes, adding sulfuric acid for 3 times at intervals of 20 minutes every time, rotating for 130-140 minutes after the addition is finished, controlling the pH value to be 2.2-2.6, and then performing chrome tanning.
Specifically, retanning: adding 50-100 parts by mass of mixed liquor of glutaraldehyde and a synthetic tanning agent, 1-3 parts by mass of a masking agent and 3-4 parts by mass of a fatting agent into 100 parts of skin, respectively dissolving the mixed liquor of the masking agent, the glutaraldehyde and the synthetic tanning agent by using water at 46-48 ℃, preparing an acid-base regulator solution from the acid-base regulator by using water, regulating the temperature to 46-48 ℃, adding the mixed liquor of the glutaraldehyde and the synthetic tanning agent, the masking agent and the fatting agent, and regulating the pH value of the mixed liquor to 3 by adding the acid-base regulator solution;
specifically, neutralization: the filtrate was neutralized to an aqueous solution of pH 7 by the addition of a basic compound.
A production method of buffalo hide instead of buffalo hide is characterized by that when it is used, the surface and interior of buffalo hide can be cleaned by using pre-soaking, main soaking, liming, deliming, softening, pickling and tanning agent and post-treatment process and combining with related treatment reagent so as to dissolve plasma protein and non-collagen protein in the buffalo hide and can obtain the action of cleaning buffalo hide.
Aiming at the special requirements of the performance of buffalo leather products, a targeted operation method is implemented in each working procedure in the processing process, so that the finished leather is plump, soft and elastic, the tensile strength and the tear strength of the leather are ensured to meet the requirements, and the tensile strength and the tear strength of the leather are ensured to meet the requirements. The process technologies of soaking, liming, deliming, softening and pickling and tanning are deeply researched by adopting a new technology and a novel auxiliary agent; screening the leather material with excellent performance, and remarkably solving the problem of loose surface in the production of buffalo hide upper leather; various finishing processes are researched, and the problems of fullness and elasticity of the leather body and flat and fine grain surface are solved.
The fleshing is carried out after the soaking, which is beneficial to the penetration of chemical reagents in the subsequent processing. The pickling is realized by combining formic acid and sulfuric acid, and the formic acid is added firstly, so that the pickling effect is realized, and the masking effect on the subsequent tanning is realized, so that the finished leather is soft and full. The tanning adopts a chrome tanning method, can improve the chemical reagent resistance, acid and alkali resistance and oxidation resistance of the finished leather, and can ensure uniform dyeing. In the wet finishing process after tanning, retanning neutralization is firstly carried out, so that the combination of dye, fatliquor and leather can be improved, and the softness, the brightness and the hue saturation of the leather are greatly improved; give the leather a particularly pleasant intrinsic softness and a particularly smooth and fine grain.
In the wet processing, a plurality of retanning agents are adopted for combined retanning, so that the combination amount and the filling amount of the junction part of a nipple layer and a reticular layer are improved as much as possible, the leather body is plump and compact, and a solid foundation is laid for the subsequent polishing and finishing. The safe dye, sulfited fish oil, synthetic fatting agent and soft fatting agent are selected when dyeing and oiling are carried out, so that the leather has the advantages of dry cleaning resistance, light resistance, good storage resistance, plump and soft leather body and good elasticity. By adopting the vacuum drying room flat-plate drying technology, the heat energy loss during drying can be reduced, the occupied area can be saved, and the working efficiency is improved. In a word, in the production process, the proper control of each process is strictly achieved, the quality of the product is improved, and the quality requirement of the product is met.
The soft cattle upper leather prepared from the advanced leather materials has excellent fullness and elasticity and soft and comfortable hand feeling, remarkably improves the physical properties of the leather, reduces loose leather and meets the requirements of people.
The method for reducing the consumption of sulfides by adopting the auxiliary agent, the method for tanning by using less chromium, the reasonable water washing process and the scheme of the grey leather splitting process are beneficial to environmental protection and beneficial to the development of enterprises.
The main innovation points of the invention are mainly represented as follows:
1. the fleshing is carried out after the soaking, which is beneficial to the penetration of chemical reagents in the subsequent processing. The pickling is realized by combining formic acid and sulfuric acid, the pickling time and temperature are strictly controlled, the pickling effect is realized, and the masking effect is also realized on the subsequent tanning, so that the finished leather is soft and plump.
2. The tanning adopts a chrome tanning method, can improve the chemical reagent resistance, acid and alkali resistance and oxidation resistance of the finished leather, and can ensure uniform dyeing. In the wet finishing process after tanning, retanning neutralization is firstly carried out, so that the combination of dye, fatliquor and leather can be improved, and the softness, the brightness and the hue saturation of the leather are greatly improved; give the leather a particularly pleasant intrinsic softness and a particularly smooth and fine grain.
3. The leather body layer, the bamboo charcoal fiber layer and the non-woven fabric layer are leather, and the leather achieves a better ventilation effect through procedures of tanning (chrome tanning), retanning (acrylic acid), greasing, softening and the like.
4. The tanning agent is compounded and combined by adopting the vegetable tanning agent, the modified glutaraldehyde, the synthetic tanning agent and other tanning agents, so that the leather surface has higher shrinkage temperature and physical and mechanical properties, and the problem of serious environmental pollution caused by the traditional tanning process can be solved.
The cow leather produced by the buffalo hide and the cow leather produced by the cattle hide achieve the same effect. The total industrial value can be 4500 ten thousand yuan per year, the income of local finance and tax is increased by 90 ten thousand yuan per year, and the production capacity of processing 6 ten thousand buffalo hide upper leather per year is formed.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the application disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope of the disclosure being indicated by the following claims.
It will be understood that the present application is not limited to the precise arrangements that have been described above and that various modifications and changes may be made without departing from the scope thereof. The above-described embodiments of the present application do not limit the scope of the present application.
Claims (7)
1. A method for producing buffalo hide instead of buffalo hide is characterized by sequentially comprising the following steps: pre-soaking, main soaking, liming, deliming, softening, pickling, chrome tanning, shaving, retanning, neutralizing, dyeing, fatliquoring, drying and finishing;
pre-soaking: putting the raw hide into a rotary drum, adding water, a water soaking agent BH-C, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 30-40 minutes, stopping for 20 minutes, circulating for more than 2 times, and then taking out the raw hide from the drum to remove flesh;
soaking: adding water, a soaking agent, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 15-20 minutes, stopping for 10 minutes, circulating for more than 2 times, then adding soda ash, rotating for 15-20 minutes, stopping for 10 minutes, circulating for more than 2 times, rotating for 5-10 minutes every 2 hours, and controlling the pH value to be 9.2-9.5 for 21-23 hours;
liming: mixing raw hide, water and liming enzyme, and then adding a liming auxiliary agent, lime, an expanding agent and sodium hydrosulfide, wherein the weight ratio of the raw hide to the liming auxiliary agent to the lime to the expanding agent is 100: 0.2-0.3: 0.5-0.6: 0.1;
deliming: hydrolyzing hair, shavings, trimmings or feathers in an inorganic acid solution to produce an amino acid or amino acid salt, then obtaining a protein hydrolysate, and neutralizing the filtrate with an ammonium-free basic compound to a pH of 4-6 to obtain a protein hydrolysate solution;
softening: adding water, ammonium sulfate and ORAPON softening enzyme into the rotary drum, rotating for 120-360 minutes, and washing after completely softening;
pickling: adding water and salt into the rotary drum, rotating for 15 minutes, adding formic acid, rotating for 30 minutes, adding sulfuric acid for 3 times at intervals of 20 minutes every time, rotating for 130-140 minutes after the addition is finished, controlling the pH value to be 2.2-2.6, and then performing chrome tanning;
chrome tanning: adding 150 parts by mass of water into 100 parts of leather, adding 3 parts by mass of white tannin and 5 parts by mass of phenolic synthetic leather agent at the temperature of 34-35 ℃, rotating for 60 minutes in a rotary drum, adding 3 parts by mass of macromolecular acrylic acid and 2 parts by mass of medium molecular acrylic acid, rotating for 60 minutes in the rotary drum, adding 5 parts by mass of chromium powder, 2 parts by mass of chromium-containing tannin and 1 part by mass of anti-tear grease, rotating for 60 minutes in the rotary drum, adding 1.5 parts by mass of sodium formate, rotating for 30 minutes in the rotary drum, adding 0.5 part by mass of baking soda, rotating for 60 minutes in the rotary drum, adding 50 parts by mass of 40-degree hot water, and rotating for 12-24 hours in the rotary drum;
shaving: after the acid-soaked leather is subjected to sanding, the leather is rubbed after being coated with grease, so that the leather has uniform hand feeling;
retanning: adding 20-100 parts by mass of mixed liquor of glutaraldehyde and a synthetic tanning agent, 1-5 parts by mass of a masking agent and 3-5 parts by mass of a fatting agent into 100 parts of skin, respectively dissolving the mixed liquor of the masking agent, the glutaraldehyde and the synthetic tanning agent by water at 45-50 ℃, preparing an acid-base regulator solution from the acid-base regulator by using water, regulating the temperature to 45-50 ℃, adding the mixed liquor of the glutaraldehyde and the synthetic tanning agent, the masking agent and the fatting agent, and regulating the pH value of the mixed liquor to 2-4 by adding the acid-base regulator solution;
neutralizing: adding alkaline compound to neutralize the filtrate to water solution with pH value of 6.5-7.5;
dyeing and fat liquoring: adding a coloring agent and a fatting agent for dyeing and fatting;
drying and finishing: and finally, drying.
2. A method of producing buffalo hide in place of buffalo hide according to claim 1, wherein the pre-soaked water: putting the raw hide into a rotary drum, adding water, a water soaking agent BH-C, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 35 minutes, stopping for 20 minutes, circulating for 4 times, and then taking out the drum to remove meat.
3. The method for producing buffalo hide instead of buffalo hide according to claim 1, characterized by soaking: and adding water, a soaking agent, soda ash, a bactericide and a degreasing agent into the rotary drum, rotating for 17 minutes, stopping for 10 minutes, circulating for 4 times, then adding soda ash, rotating for 17 minutes, stopping for 10 minutes, circulating for 4 times, rotating for 8 minutes every 2 hours, controlling the pH value to be 9.4, and totally 21-23 hours.
4. The method for producing buffalo hide instead of buffalo hide according to claim 1, characterized by softening: adding water, ammonium sulfate and ORAPON softening enzyme into the rotary drum, rotating for 320 min, and washing with water after completely softening.
5. The method for producing buffalo hide instead of buffalo hide according to claim 1, characterized by pickling: adding water and salt into the rotary drum, rotating for 15 minutes, adding formic acid, rotating for 30 minutes, adding sulfuric acid for 3 times at intervals of 20 minutes every time, rotating for 130-140 minutes after the addition is finished, controlling the pH value to be 2.2-2.6, and then performing chrome tanning.
6. A method for producing buffalo hide instead of buffalo hide according to claim 1, characterized in that retanning: adding 50-100 parts by mass of mixed liquor of glutaraldehyde and a synthetic tanning agent, 1-3 parts by mass of a masking agent and 3-4 parts by mass of a fatting agent into 100 parts of leather, respectively dissolving the mixed liquor of the masking agent, the glutaraldehyde and the synthetic tanning agent in water at 46-48 ℃, preparing an acid-base regulator solution from the acid-base regulator in water, regulating the temperature to 46-48 ℃, adding the mixed liquor of the glutaraldehyde and the synthetic tanning agent, the masking agent and the fatting agent, and regulating the pH value of the mixed liquor to 3 by adding the acid-base regulator solution.
7. The method for producing buffalo hide instead of buffalo hide according to claim 1, characterized by neutralizing: the filtrate was neutralized to an aqueous solution of pH 7 by the addition of a basic compound.
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|---|---|---|---|---|
| CN101445843B (en) * | 2008-12-30 | 2012-08-08 | 国家皮革质量监督检验中心（浙江） | Method for carrying out unhairing and liming treatment without dust and akali sulphide during buffalo hide tanning |
| CN102943139B (en) * | 2012-09-25 | 2014-05-14 | 兴业皮革科技股份有限公司 | Aldehyde vegetable-chrome tanning combined production method for waxed soft leather |
| CN104293986B (en) * | 2014-08-14 | 2017-01-18 | 兴业皮革科技股份有限公司 | Waterproof cow leather preparation technology |
| CN105132596B (en) * | 2015-07-30 | 2017-05-24 | 兴业皮革科技股份有限公司 | Production technology of cow skin nappa leather |
| CN109628663B (en) * | 2018-12-17 | 2021-11-23 | 兴业皮革科技股份有限公司 | Preparation process of wet cow blue leather |
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