阅读说明：本技术 耐水洗牛二层皮革的环保制备工艺 (Environment-friendly preparation process of washable oxen two-layer leather ) 是由 陈庆丰 庄汉珍 刘建刚 于 2020-12-31 设计创作，主要内容包括：本发明涉及皮革制备技术领域,且公开了耐水洗牛二层皮革的环保制备工艺,包括以下步骤,取牛皮,放入瓮中,加入食盐,加水淹没牛皮,静置3-5天后取出牛皮,抖落盐粒后整形,整形后使用竹竿绷开阴干备用,将阴干的牛皮投入恒温震荡机内,加水后开启恒温震荡机进行清洗,十五分钟后取出。该耐水洗牛二层皮革的环保制备工艺,通过将氢氧化钠溶液投入加热釜内,投入木屑,加热到200-220℃,搅拌5分钟后持续加热去除水分得到沉淀物,沉淀物研磨后过滤,加水和石灰乳,沉淀后取上清液,加醋酸搅拌均匀后加氯化钙搅拌均匀,得到所求耐水洗牛二层皮革,通过无污染的植物和木屑代替污染排放严重的化学制剂,生产工艺绿色环保。(The invention relates to the technical field of leather preparation, and discloses an environment-friendly preparation process of water-resistant cow two-layer leather. The environment-friendly preparation process of the water-resistant cattle second-layer leather comprises the steps of putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-fold-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernate after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, and stirring uniformly to obtain the required water-resistant cattle second-layer leather, replacing chemical preparations with pollution-free plants and wood chips to seriously discharge, and the production process is environment-friendly.)

1. The environment-friendly preparation process of the washable cattle two-layer leather is characterized by comprising the following steps of:

1) taking cow leather, putting into a jar, adding salt, adding water to submerge the cow leather, standing for 3-5 days, taking out the cow leather, shaking off salt grains, shaping, stretching with bamboo poles, and drying in the shade for later use;

2) putting the dried cowhide into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine for cleaning, and taking out after fifteen minutes;

3) putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernatant after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, standing, taking the precipitate, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1;

4) putting the cleaned cowhide into a rotary drum, adding the solution 1, opening the rotary drum for 20-25 minutes, and then closing the rotary drum;

5) grinding caulis et folium bauhiniae, filtering, adding the filtrate into a rotary drum, mixing with cow leather, opening the rotary drum for 20-30 min, and closing;

5) and taking out the cow leather, drying, and polishing the exterior of the cow leather by using a polishing machine to obtain the water-washing-resistant cow two-layer leather.

2. The environment-friendly preparation process of the washable cattle hide two-layer leather as claimed in claim 1, characterized in that: taking the cowhide, putting the cowhide into a jar, adding salt, adding water to submerge the cowhide, standing for 3-5 days, taking out the cowhide, shaking off salt grains, shaping, stretching with a bamboo rod, drying in the shade for later use, wherein the salt is five times the weight of the cowhide, and the water is added to submerge the cowhide for three centimeters.

3. The environment-friendly preparation process of the washable cattle hide two-layer leather as claimed in claim 1, characterized in that: and 2, putting the dried cowhide into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine for cleaning, taking out after fifteen minutes, and cleaning at the temperature of 20-30 ℃.

4. The environment-friendly preparation process of the washable cattle hide two-layer leather as claimed in claim 1, characterized in that: and 3, putting the sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernatant after precipitation, adding acetic acid, uniformly stirring, adding calcium chloride, uniformly stirring, standing, taking the precipitate, adding sulfuric acid, uniformly stirring, removing the precipitate to obtain a solution 1, grinding the precipitate, filtering, and filtering with a filter screen mesh number of 120 meshes.

5. The environment-friendly preparation process of the washable cattle hide two-layer leather as claimed in claim 1, characterized in that: and 5, taking the bauhinia championii leaves, grinding, filtering, adding the filtrate into a rotary drum, mixing with cow leather, opening the rotary drum for 20-30 minutes, closing, cleaning the bauhinia championii leaves with clear water before grinding, drying in the shade for later use, wrapping with gauze after grinding, extruding the filtrate, standing the filtrate for five minutes, and removing the precipitate.

Technical Field

The invention relates to the technical field of leather preparation, in particular to an environment-friendly preparation process of washable cattle double-layer leather.

Background

The second-layer leather of the cow is prepared by spraying or coating PVC and PU films on the loose second-layer part of the fiber tissue of the cow leather through chemical materials, and the second-layer leather of the cow leather is very thick and smooth and has no wrinkles when pressed by hands.

Chinese patent CN107641667B proposes an environment-friendly waterproof no-dissolution chromium cowhide double-layer leather and a manufacturing method thereof, liquid auxiliary agent chemical materials used in each procedure are all water-soluble chemical materials, are friendly to the environment and human bodies, do not produce secondary pollution, and all treatment procedures are acid environments, can effectively prevent trivalent chromium from being converted into hexavalent chromium, although hexavalent chromium pollutants are not produced in the process, a plurality of chemical agents are used in the production process, and the pollution emission of the chemical agents in the production is still large, so that the environment-friendly preparation process of the water-washing resistant cowhide double-layer leather is provided.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the environment-friendly preparation process of the washable cattle second-layer leather, which has the advantages of green and environment-friendly production process, less used chemical agents and the like, and solves the problems that the traditional process does not produce hexavalent chromium pollutants, but uses more various chemical agents in the production process, and the pollution emission of the chemical agents in the production process is still great.

(II) technical scheme

In order to realize the purposes of green and environment-friendly production process and less use of chemical agents, the invention provides the following technical scheme: the environment-friendly preparation process of the washable cattle second-layer leather comprises the following steps:

1) taking cow leather, putting into a jar, adding salt, adding water to submerge the cow leather, standing for 3-5 days, taking out the cow leather, shaking off salt grains, shaping, stretching with bamboo poles, and drying in the shade for later use;

2) putting the dried cowhide into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine for cleaning, and taking out after fifteen minutes;

3) putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernatant after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, standing, taking the precipitate, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1;

4) putting the cleaned cowhide into a rotary drum, adding the solution 1, opening the rotary drum for 20-25 minutes, and then closing the rotary drum;

5) grinding caulis et folium bauhiniae, filtering, adding the filtrate into a rotary drum, mixing with cow leather, opening the rotary drum for 20-30 min, and closing;

5) and taking out the cow leather, drying, and polishing the exterior of the cow leather by using a polishing machine to obtain the water-washing-resistant cow two-layer leather.

Preferably, the cowhide is taken in the step 1 and put into a vat, salt is added, water is added to submerge the cowhide, the cowhide is taken out after standing for 3-5 days, salt grains are shaken off and shaped, a bamboo pole is used for stretching and drying in the shade for standby after shaping, the salt is five times the weight of the cowhide, and the water is added to submerge the cowhide for three centimeters.

Preferably, the cowhide dried in the shade in the step 2 is put into a constant temperature shaking machine, the constant temperature shaking machine is started to clean after water is added, and the cowhide is taken out after fifteen minutes, wherein the cleaning temperature is 20-30 ℃.

Preferably, the sodium hydroxide solution is added into the heating kettle in the step 3, the wood chips are added, the heating is carried out to 200-220 ℃, the stirring is carried out for 5 minutes, then the heating is continuously carried out to remove the water content, so as to obtain a precipitate, the precipitate is ground and filtered, water and lime milk are added, the supernatant is obtained after the precipitation, acetic acid is added, the mixture is uniformly stirred, calcium chloride is added, the mixture is uniformly stirred, the precipitate is taken after the standing, sulfuric acid is added into the precipitate, the precipitate is uniformly stirred and removed, so as to obtain a solution 1, the precipitate is ground and filtered, and the mesh number of a filter screen.

Preferably, the bauhinia championii leaves are taken, ground, filtered, filtrate is taken and added into a rotary drum to be mixed with cow leather, the rotary drum is opened for 20-30 minutes and then closed, the bauhinia championii leaves are cleaned by using clear water before being ground, dried in the shade for standby, ground and wrapped by gauze, filtrate is extruded, and the precipitate is removed after the filtrate is kept stand for five minutes.

(III) advantageous effects

Compared with the prior art, the invention provides the environment-friendly preparation process of the washable cattle second-layer leather, which has the following beneficial effects:

1. the environment-friendly preparation process of the water-resistant bovine two-layer leather comprises the steps of putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, precipitating, taking a supernatant, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, standing, taking a precipitate, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1, putting the cleaned bovine leather into a rotary drum, adding the solution 1, opening the rotary drum for 20-25 minutes, closing, taking bauhinia championii blades, grinding, filtering, adding a filtrate into the rotary drum, mixing with the bovine leather, opening the rotary drum for 20-30 minutes, closing, taking the bovine leather out, drying, polishing the exterior of a polishing machine to obtain the water-resistant bovine two-layer leather, replacing a chemical preparation with pollution-free plants and wood chips, which are seriously discharged, the production process is green and environment-friendly.

2, the environment-friendly preparation process of the water-resistant cow second-layer leather comprises the steps of taking cow leather, placing the cow leather into a vat, adding salt, adding water to submerge the cow leather, standing for 3-5 days, taking out the cow leather, shaking off salt grains, shaping, stretching the cow leather by using a bamboo rod for drying in the shade for later use, putting the dried cow leather into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine for cleaning, adding water, taking out the cow leather after fifteen minutes, putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernatant after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, taking the precipitate after standing, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1, and being simple in preparation process and low in material price, so that the preparation cost of the cow second-layer leather is greatly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example (b): the environment-friendly preparation process of the washable cattle second-layer leather comprises the following steps:

1) taking cow leather, putting into a jar, adding salt, adding water to submerge the cow leather, standing for 3-5 days, taking out the cow leather, shaking off salt grains, shaping, stretching with bamboo poles, and drying in the shade for later use;

2) putting the dried cowhide into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine for cleaning, and taking out after fifteen minutes;

3) putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernatant after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, standing, taking the precipitate, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1;

4) putting the cleaned cowhide into a rotary drum, adding the solution 1, opening the rotary drum for 20-25 minutes, and then closing the rotary drum;

5) grinding caulis et folium bauhiniae, filtering, adding the filtrate into a rotary drum, mixing with cow leather, opening the rotary drum for 20-30 min, and closing;

5) and taking out the cow leather, drying, and polishing the exterior of the cow leather by using a polishing machine to obtain the water-washing-resistant cow two-layer leather.

Putting cowhide into a jar, adding salt, adding water to submerge the cowhide, standing for 3-5 days, taking out the cowhide, shaking off salt grains, shaping, stretching with bamboo rod, and drying in the shade, wherein the salt is five times the weight of the cowhide, and the water is added to submerge the cowhide for three centimeters.

Putting the dried cowhide into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine to clean, taking out after fifteen minutes, and cleaning at the temperature of 20-30 ℃.

Putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking supernatant after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, standing, taking the precipitate, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1, grinding the precipitate, filtering, and sieving with a sieve mesh of 120 meshes.

Grinding caulis et folium Clerodendri Bungei, filtering, mixing the filtrate with cow leather, opening the rotary drum for 20-30 min, closing, cleaning the caulis et folium Clerodendri Bungei with clear water before grinding, drying in the shade, grinding, wrapping with gauze, squeezing to obtain filtrate, standing for five min, and removing precipitate.

Putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-, the preparation method comprises the steps of taking cow leather, putting the cow leather into a vat, adding salt, adding water to submerge the cow leather, standing for 3-5 days, taking out the cow leather, shaking off salt particles, shaping, stretching the cow leather with a bamboo rod for drying in the shade for later use, putting the dried cow leather into a constant-temperature shaking machine, adding water, starting the constant-temperature shaking machine for cleaning, taking out fifteen minutes later, putting a sodium hydroxide solution into a heating kettle, adding wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, taking a supernatant after precipitation, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, taking a precipitate after standing, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1, and having a simple process and low material price in the preparation process, so that the preparation cost of the cow two-layer leather is greatly reduced.

The cow leather is taken out and dried, the polishing machine is used for polishing the outside of the cow leather after drying, the required water-fast cow two-layer leather is obtained, the surface of the cow leather is smooth through polishing, a film is conveniently coated or a hydrophobic material is coated during later processing, the smooth leather is not easy to be stained with water and dirty, the phenomenon of lotus leaf corbel can be quickly caused when water drops on the surface of the leather, and liquid pollution is not easy to be soaked into the leather.

The invention has the beneficial effects that: the environment-friendly preparation process of the water-resistant bovine two-layer leather comprises the steps of putting a sodium hydroxide solution into a heating kettle, putting wood chips, heating to 200-220 ℃, stirring for 5 minutes, continuously heating to remove water to obtain a precipitate, grinding the precipitate, filtering, adding water and lime milk, precipitating, taking a supernatant, adding acetic acid, stirring uniformly, adding calcium chloride, stirring uniformly, standing, taking a precipitate, adding sulfuric acid, stirring uniformly, removing the precipitate to obtain a solution 1, putting the cleaned bovine leather into a rotary drum, adding the solution 1, opening the rotary drum for 20-25 minutes, closing, taking bauhinia championii blades, grinding, filtering, adding a filtrate into the rotary drum, mixing with the bovine leather, opening the rotary drum for 20-30 minutes, closing, taking the bovine leather out, drying, polishing the exterior of a polishing machine to obtain the water-resistant bovine two-layer leather, replacing a chemical preparation with pollution-free plants and wood chips, which are seriously discharged, the production process is green and environment-friendly, the cow leather is taken out, put into a jar, added with salt, added with water to submerge the cow leather, kept stand for 3-5 days, taken out, shaken off salt grains for shaping, stretched and dried in the shade for standby by using a bamboo rod, put the dried cow leather into a constant-temperature shaking machine, cleaned by starting the constant-temperature shaking machine after added with water, taken out after fifteen minutes, put a sodium hydroxide solution into a heating kettle, put sawdust into the heating kettle, heated to 220 ℃ of 200 plus materials, stirred for 5 minutes, continuously heated to remove moisture to obtain a precipitate, the precipitate is ground and filtered, added with water and lime milk, the supernatant is taken after precipitation, added with acetic acid and stirred uniformly, calcium chloride is added and stirred uniformly, the precipitate is taken out after standing, added with sulfuric acid, the precipitate is removed after stirring uniformly to obtain a solution 1, the process in the preparation process is simple, the material price is low, so that the preparation cost of the, solves the problems that the traditional process does not generate hexavalent chromium pollutants, but uses a plurality of chemical agents in the production process, and the pollution discharge of the chemical agents in the production is still a lot.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.