1. The production method of the environment-friendly ecological environment-friendly leather is characterized by comprising the following steps: the production method comprises the following steps:

a. a material preparation procedure, wherein the material preparation procedure comprises the steps of manufacturing a substrate and selecting leather;

b. a pre-tanning process: the pre-tanning process comprises the steps of soaking the leather raw material by using a pre-tanning agent;

c. tanning process: the tanning process comprises soaking leather raw materials by using a tanning agent;

d. a crosslinking step: the cross-linking procedure is to attach the leather to the substrate;

e. coating: the coating procedure comprises the steps of coating the outer side of the leather raw material by using a surface coating agent;

f. waste liquid treatment: the waste liquid treatment comprises the step of carrying out classified collection on waste liquid generated in the production process and carrying out treatment in a medium.

2. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the step of fabricating a substrate comprises:

1) sizing the non-woven fabric base cloth with waterborne polyurethane resin on a scutching machine, sealing and slurrying, and drying and rolling at 60 ℃ to obtain a substrate;

2) and placing the substrate on a foaming furnace, coating a layer of waterborne polyurethane slurry at the speed of 30 m/min, placing the substrate in a foaming furnace oven after coating, and drying at the temperature of 120 ℃ to finish the manufacture of the substrate.

3. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the step of selecting leather comprises:

1) selecting the cowhide with better quality, cleaning, softening, performing acid leaching treatment, and then placing on an airing rack for storage.

4. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the pretanning agent is a solution prepared by mixing 60% of clear water at 25 ℃, 10% of salt, 2% of formic acid, 0.2% of sulfuric acid, 5% of glutaraldehyde and 2% of baking soda.

5. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the tanning agent is a solution formed by mixing 60 percent of clear water at 30 ℃ with 5 percent of substituted tannin Blancotan HN, 10 percent of Indusol ATO, 12 percent of Dulcotan Special and 8 percent of white tannin Blancotan BC.

6. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the step of the crosslinking process comprises:

1) spreading the substrate on a conveyor belt of a coating machine, and uniformly coating a cross-linking agent on the upper surface of the substrate;

2) and flatly paving the leather on the upper surface of the substrate, and compacting the substrate and the leather by using a compression roller so that the leather is tightly attached to the substrate.

7. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the coating process comprises the following steps:

1) selecting PU resin, putting the PU resin into a heating and stirring tank, and heating and stirring the PU resin by using the heating and stirring tank to enable the PU resin to be in a fluid state;

2) putting the cross-linked leather and the substrate into a coating machine, and coating PU resin on the surface of the leather by using the coating machine;

3) and horizontally placing the coated leather on a placing rack, and placing for 8-24 hours at room temperature to cool the PU resin.

8. The method for producing the environment-friendly ecological environment-friendly leather according to claim 1, characterized in that: the waste liquid treatment step comprises:

1) collecting the wastewater for cleaning the leather raw material into a wastewater tank A, and filtering, precipitating and sterilizing the wastewater for recycling;

2) collecting the wastewater of the softened leather raw material into a wastewater tank B, filtering, precipitating and sterilizing the wastewater, and then discharging the wastewater into an underground pipeline;

3) and collecting the wastewater of the acid-leaching leather raw material into a wastewater tank C, filtering, precipitating, neutralizing with acid and alkali, sterilizing and then discharging into an underground pipeline.

Background

Hides are subjected to a series of preparatory steps of soaking, unhairing, liming, bating, pickling, etc., before tanning in the tanning, which leaves the hide predominantly with a web of fibres consisting of collagen, but not the leather. Tanning is generally carried out in a rotating drum, and the tanning process varies depending on the tanning agent used and the variety of finished leather. Mainly comprises chrome tanning and plant tanning, and also comprises aldehyde tanning, oil tanning, aluminum tanning, zirconium tanning, combined tanning, alum tanning, formaldehyde tanning and the like. The fur making process is superior to available tanning process without ash soaking and unhairing and heavy leather tanning process. The physicochemical process by which the hide is converted into leather by a tanning agent is known as tanning. Tanning is an important process for processing leather and fur. Tanning using different tanning agents results in different tanning processes. For example, the most common tanning method of chrome tanning agent for light leather is called chrome tanning method, and the oil wax leather is one of the leather making processes of cow leather and needs to be separated from the common cow leather making process in a water plant process.

When the existing leather is used, the tensile resistance of the leather is poor, and the outer surface of the leather is not wear-resistant and scratch-resistant, so that certain defects exist.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a production method of environment-friendly ecological environment-friendly leather, and solves the problems that the existing leather is poor in stretch resistance, and the outer surface of the leather is not wear-resistant and scratch-resistant when in use.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a production method of environment-friendly ecological environment-friendly leather comprises the following steps:

a. a material preparation procedure, wherein the material preparation procedure comprises the steps of manufacturing a substrate and selecting leather;

b. a pre-tanning process: the pre-tanning process comprises the steps of soaking the leather raw material by using a pre-tanning agent;

c. tanning process: the tanning process comprises soaking leather raw materials by using a tanning agent;

d. a crosslinking step: the cross-linking procedure is to attach the leather to the substrate;

e. coating: the coating procedure comprises the steps of coating the outer side of the leather raw material by using a surface coating agent;

f. waste liquid treatment: the waste liquid treatment comprises the step of carrying out classified collection on waste liquid generated in the production process and carrying out treatment in a medium.

Preferably, the step of fabricating a substrate comprises:

1) sizing the non-woven fabric base cloth with waterborne polyurethane resin on a scutching machine, sealing and slurrying, and drying and rolling at 60 ℃ to obtain a substrate;

2) and placing the substrate on a foaming furnace, coating a layer of waterborne polyurethane slurry at the speed of 30 m/min, placing the substrate in a foaming furnace oven after coating, and drying at the temperature of 120 ℃ to finish the manufacture of the substrate.

Preferably, the step of selecting leather comprises:

1) selecting the cowhide with better quality, cleaning, softening, performing acid leaching treatment, and then placing on an airing rack for storage.

Preferably, the pretanning agent is a solution prepared by mixing 60% of clear water at 25 ℃, 10% of salt, 2% of formic acid, 0.2% of sulfuric acid, 5% of glutaraldehyde and 2% of baking soda.

Preferably, the tanning agent is a solution of 60%, 30 ℃ clear water and 5% of substitution tannin Blancotan HN, 10% of Indusol ATO, 12% of Dulcotan Special and 8% of white tannin Blancotan BC.

Preferably, the step of the crosslinking process comprises:

1) spreading the substrate on a conveyor belt of a coating machine, and uniformly coating a cross-linking agent on the upper surface of the substrate;

2) and flatly paving the leather on the upper surface of the substrate, and compacting the substrate and the leather by using a compression roller so that the leather is tightly attached to the substrate.

Preferably, the water squeezing and shaving step includes:

1) selecting PU resin, putting the PU resin into a heating and stirring tank, and heating and stirring the PU resin by using the heating and stirring tank to enable the PU resin to be in a fluid state;

2) putting the cross-linked leather and the substrate into a coating machine, and coating PU resin on the surface of the leather by using the coating machine;

3) and horizontally placing the coated leather on a placing rack, and placing for 8-24 hours at room temperature to cool the PU resin.

Preferably, the tanning process comprises:

1) the step of waste liquid treatment comprises:

1) collecting the wastewater for cleaning the leather raw material into a wastewater tank A, and filtering, precipitating and sterilizing the wastewater for recycling;

2) collecting the wastewater of the softened leather raw material into a wastewater tank B, filtering, precipitating and sterilizing the wastewater, and then discharging the wastewater into an underground pipeline;

3) and collecting the wastewater of the acid-leaching leather raw material into a wastewater tank C, filtering, precipitating, neutralizing with acid and alkali, sterilizing and then discharging into an underground pipeline.

(III) advantageous effects

The invention provides a production method of environment-friendly ecological environment-friendly leather. The method has the following beneficial effects:

through carrying out the cross-linking with leather and base, increase the resistant tensile properties of leather, through carrying out coating treatment to the leather after tanning for the leather outside covers one deck protective layer, can improve the wear-resisting and resistant scratch of leather, and the waste water that produces when producing the leather is collected the processing, reduces the emission of waste water.

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.

The first embodiment is as follows:

the embodiment of the invention provides a production method of environment-friendly ecological environment-friendly leather, which comprises the following steps:

a. the preparation process comprises the steps of preparing a substrate, selecting leather, sizing the non-woven fabric base cloth on a scutching machine with aqueous polyurethane resin, sealing and slurrying, drying and rolling at 60 ℃ to obtain the substrate, putting the substrate on a foaming furnace, coating a layer of aqueous polyurethane slurry at the speed of 30 m/min, putting the substrate into a foaming furnace oven after coating, and drying at 120 ℃ to finish the preparation of the substrate; the leather raw material is sequentially cleaned, softened and acid-dipped, and the cleaning step comprises the following steps: putting the leather raw material into a cleaning roller; adding 150% of clear water at 25 ℃ into the cleaning roller; starting a cleaning roller, and cleaning for 15 min; opening the water outlet, discharging the water in the cleaning roller, and adding 200%, 25 ℃ clear water and 0.5% ammonium sulfate; starting a cleaning roller, and cleaning for 15 min; the step of softening comprises: putting the cleaned leather raw material into a soaking tank A filled with 200 percent of clear water at 35 ℃ and 0.5 percent of softener; soaking for 40min, discharging the softening solution, and washing the first layer cowhide in the soaking tank A with cold water for 15 min; the acid leaching step comprises: putting the washed leather raw material into a soaking tank B filled with 60 percent of clear water at 25 ℃, 10 percent of salt, 2 percent of formic acid and 0.2 percent of sulfuric acid, soaking for 3 hours, and taking out the leather raw material;

b. a pre-tanning process: the pretanning process comprises the steps of soaking leather raw materials by using a pretanning agent mixed by 60 percent of clear water at 25 ℃, 10 percent of salt, 2 percent of formic acid, 0.2 percent of sulfuric acid, 5 percent of glutaraldehyde and 2 percent of baking soda;

c. tanning process: the tanning process comprises soaking leather raw materials by using a tanning agent formed by mixing 60 percent of clear water at 30 ℃ with 5 percent of substituted tannin Blancotan HN, 10 percent of Indusol ATO, 12 percent of Dulcotan Special and 8 percent of white tannin Blancotan BC;

d. a crosslinking step: the cross-linking process comprises the steps of attaching leather to a substrate, flatly laying the substrate on a conveyor belt of a coating machine, uniformly coating a cross-linking agent on the upper surface of the substrate, flatly laying the leather on the upper surface of the substrate, and compacting the substrate and the leather by using a compression roller to enable the leather to be tightly attached to the substrate;

e. coating: the coating process comprises the steps of selecting PU resin, putting the PU resin into a heating and stirring tank, and heating and stirring the PU resin by using the heating and stirring tank to enable the PU resin to be in a fluid state; putting the cross-linked leather and the substrate into a coating machine, and coating PU resin on the surface of the leather by using the coating machine; and horizontally placing the coated leather on a placing rack, and placing for 8-24 hours at room temperature to cool the PU resin.

f. Waste liquid treatment: the waste liquid treatment comprises the steps of collecting the waste water for cleaning the leather raw material into a waste liquid tank A, and filtering, precipitating and sterilizing the waste water for recycling; collecting the wastewater of the softened leather raw material into a wastewater tank B, filtering, precipitating and sterilizing the wastewater, and then discharging the wastewater into an underground pipeline; collecting the wastewater of the acid-leaching leather raw material into a wastewater tank C, filtering, precipitating, neutralizing with acid and alkali, sterilizing and discharging into an underground pipeline.

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.