CN111842082A - Production method of antifouling folding-resistant leather - Google Patents
Production method of antifouling folding-resistant leather Download PDFInfo
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- CN111842082A CN111842082A CN202010735449.8A CN202010735449A CN111842082A CN 111842082 A CN111842082 A CN 111842082A CN 202010735449 A CN202010735449 A CN 202010735449A CN 111842082 A CN111842082 A CN 111842082A
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- soybean oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/12—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to leather
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
- B05D1/38—Successively applying liquids or other fluent materials, e.g. without intermediate treatment with intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/52—Two layers
- B05D7/54—No clear coat specified
- B05D7/544—No clear coat specified the first layer is let to dry at least partially before applying the second layer
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
- C08G18/3203—Polyhydroxy compounds
- C08G18/3206—Polyhydroxy compounds aliphatic
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/34—Carboxylic acids; Esters thereof with monohydroxyl compounds
- C08G18/348—Hydroxycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/36—Hydroxylated esters of higher fatty acids
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/48—Polyethers
- C08G18/4833—Polyethers containing oxyethylene units
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
- C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
- C08G18/6696—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/36 or hydroxylated esters of higher fatty acids of C08G18/38
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/08—Polyurethanes from polyethers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
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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
- C14C11/00—Surface finishing of leather
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2503/00—Polyurethanes
Abstract
The invention relates to the field of leather, in particular to a production method of antifouling folding-resistant leather, which comprises the following steps: s1: coating a layer of epoxidized soybean oil modified polyurethane resin on the surface of the leather, and baking for 90min at the temperature of 80-95 ℃; s2: standing the baked leather for 6h, and performing roller burnishing at the temperature of 100-110 ℃, wherein the roller burnishing is performed by a roller burnishing machine at the roller burnishing machine of 5-6kg/cm2(ii) a S3: uniformly mixing the antifouling agent and the auxiliary agent, coating the mixture on the surface of the leather after the roller burnishing, and then baking the mixture for 60min at the temperature of 80-100 ℃; s4: placing the leather baked in S3 at 80-85 deg.C, and rolling to 3-4kg/cm2Performing soup polishing treatment on the tumbling mill; s5: the leather after the ironing and polishing is thrown and rolled for 3min at normal temperature to obtain a finished leather product; the invention ensures that the produced leather has better antifouling and folding resistance through reasonable process and raw material arrangement, and is suitable for further popularization and application.
Description
Technical Field
The invention relates to the field of leather, in particular to a production method of antifouling folding-resistant leather.
Background
The leather is animal skin which is obtained by physical and chemical processing such as unhairing, tanning and the like and is denatured and non-perishable. The leather is formed by tightly weaving natural protein fibers in a three-dimensional space, and the surface of the leather is provided with a special grain surface layer which has natural grains and luster and comfortable hand feeling.
The existing leather has poor surface anti-fouling capability, the surface of the existing leather is easily polluted by dirt in the using process and is not easy to clean, and microcracks are easily generated on the surface of the existing leather when the existing leather is repeatedly bent in the using process, so that the attractiveness and the use of the leather are influenced.
Disclosure of Invention
Aiming at the problems, the invention provides a production method of antifouling folding-resistant leather.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a production method of antifouling folding-resistant leather comprises the following steps:
s1: coating a layer of epoxidized soybean oil modified polyurethane resin on the surface of the leather, and baking for 90min at the temperature of 80-95 ℃;
s2: standing the baked leather for 6h, and performing roller burnishing at the temperature of 100-110 ℃, wherein the roller burnishing is performed by a roller burnishing machine at the roller burnishing machine of 5-6kg/cm2；
S3: uniformly mixing the antifouling agent and the auxiliary agent, coating the mixture on the surface of the leather after the roller burnishing, and then baking the mixture for 60min at the temperature of 80-100 ℃;
s4: placing the leather baked in S3 at 80-85 deg.C, and rolling to 3-4kg/cm2Performing soup polishing treatment on the tumbling mill;
s5: and (4) tumbling the polished leather for 3min at normal temperature to obtain a finished leather product.
Further, the epoxidized soybean oil-modified polyurethane resin described in S1 was coated at a thickness of 2.0 to 2.5 mm.
Further, the preparation method of the epoxidized soybean oil modified polyurethane resin comprises the following steps:
a) the epoxy soybean oil and diethanol amine are mixed according to the mass ratio of 1.5: 1, uniformly mixing, heating to 60-65 ℃ under the protection of nitrogen, and reacting for 2.5 hours to obtain ring-opened soybean oil;
b) mixing polyethylene glycol, glycerol, dimethylolpropionic acid and ring-opened soybean oil according to a mass ratio of 1: 0.2: 0.5: 1, dropwise adding dibutyltin dilaurate into the mixed solution, uniformly mixing, heating to 50-55 ℃, and then mixing the mixed solution according to a mass ratio of 6: 1.1 to 1.4 drops of the mixture are added into hexamethylene diisocyanate trimer to be stirred and mixed, and the mixture is continuously reacted for 60 to 80min after the mixture is completely dropped to obtain a mixed component A;
c) dropwise adding triethylamine into the mixed component A, adding water for emulsification, adding a sodium hydroxide solution in the emulsification process to adjust the pH value of the system to 7-8, and preparing an aqueous mixed component B;
d) mixing the water-based mixed component B with isophorone diisocyanate according to a mass ratio of 8: 1 to obtain the epoxy soybean oil modified polyurethane resin.
Preferably, dibutyl tin dilaurate is added in step b) in an amount of 0.1-0.3% by weight of the total system.
Preferably, the molar ratio of triethylamine in step c) to dimethylolpropionic acid in step b) is 1.2: 1.
preferably, the concentration of the sodium hydroxide solution in step c) is 0.1 mol/L.
Preferably, the solids content of the aqueous mixture of component B in step c) is 25%.
Furthermore, the type of the antifouling agent in S3 is AG81, and the auxiliary agent is pentaerythritol oleate; the mass ratio of the antifouling agent to the auxiliary agent is 3: 1.
preferably, the coating thickness of the antifouling agent and auxiliary agent mixed solution in S3 is 1-2 mm.
Compared with the prior art, the invention has the following beneficial effects:
the invention ensures that the produced leather has better antifouling and folding resistance performance through reasonable process and raw material arrangement. The epoxy soybean oil modified polyurethane resin has higher crosslinking degree, and compared with the traditional epoxy soybean oil modified polyurethane resin molecules, the formed crosslinking molecules have more active functional groups distributed on the molecular chain, so that more effective binding points are formed with leather fibers, the epoxy soybean oil modified polyurethane resin can be more effectively permeated into leather, the finished leather has better softness, greasiness and fullness, and the folding resistance of the finished leather is improved; the epoxy soybean oil modified polyurethane resin with high crosslinking degree can form a compact film on the surface of the leather to prevent dirt from permeating into the leather; the anti-fouling agent AG81 can enable leather to have a good anti-fouling effect, and is convenient for later wiping and cleaning; the auxiliary agent pentaerythritol oleate can effectively improve the interface bonding force between the anti-fouling agent AG81 and the epoxy soybean oil modified polyurethane resin through ester bond action, and avoid the phenomenon of interface separation. The leather produced by the invention not only has soft and oily hand feeling, but also has better antifouling and folding resistance, and is suitable for further popularization and application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some embodiments of the present invention, but not all 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 1:
a production method of antifouling folding-resistant leather comprises the following steps:
s1: coating a layer of 2.0-2.5mm epoxidized soybean oil modified polyurethane resin on the surface of the leather, and baking for 90min at 80-95 ℃;
s2: standing the baked leather for 6h, and performing roller burnishing at the temperature of 100-110 ℃, wherein the roller burnishing is performed by a roller burnishing machine at the roller burnishing machine of 5-6kg/cm2；
S3: mixing an antifouling agent and an auxiliary agent according to a mass ratio of 3: 1, uniformly mixing, coating on the surface of the leather after roller burnishing, wherein the coating thickness is 1-2mm, and then baking for 60min at 80-100 ℃; the antifouling agent is AG81, and the assistant is pentaerythritol oleate.
S4: placing the leather baked in S3 at 80-85 deg.C, and rolling to 3-4kg/cm2Performing soup polishing treatment on the tumbling mill;
s5: and (4) tumbling the polished leather for 3min at normal temperature to obtain a finished leather product.
Further, the preparation method of the epoxy soybean oil modified polyurethane resin comprises the following steps:
a) the epoxy soybean oil and diethanol amine are mixed according to the mass ratio of 1.5: 1, uniformly mixing, heating to 60-65 ℃ under the protection of nitrogen, and reacting for 2.5 hours to obtain ring-opened soybean oil;
b) mixing polyethylene glycol, glycerol, dimethylolpropionic acid and ring-opened soybean oil according to a mass ratio of 1: 0.2: 0.5: 1, dropwise adding dibutyltin dilaurate into the mixed solution, uniformly mixing, heating to 50-55 ℃, and then mixing the mixed solution according to a mass ratio of 6: 1.1 dropwise adding the mixture into hexamethylene diisocyanate trimer, stirring and mixing, and continuously reacting for 60-80min after the mixed solution is completely dropwise added to obtain a mixed component A; wherein the addition amount of the dibutyl tin dilaurate is 0.1-0.3% of the total mass of the system.
c) Dropwise adding triethylamine into the mixed component A, and adding water for emulsification, wherein the molar ratio of the triethylamine to the dimethylolpropionic acid in the step b) is 1.2: 1, adding a sodium hydroxide solution in the emulsification process to adjust the pH value of a system to 7-8 to prepare an aqueous mixed component B with the solid content of 25%;
d) mixing the water-based mixed component B with isophorone diisocyanate according to a mass ratio of 8: 1 to obtain the epoxy soybean oil modified polyurethane resin.
Example 2:
the production method of the stain-resistant and folding-resistant leather in this example was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin in this example is substantially the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in step b) is 6: 1.2.
example 3:
the production method of the stain-resistant and folding-resistant leather in this example was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin in this example is substantially the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in step b) is 6: 1.3.
example 4:
the production method of the stain-resistant and folding-resistant leather in this example was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin in this example is substantially the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in step b) is 6: 1.4.
comparative example 1:
the production method of the stain-resistant and folding-resistant leather was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin is basically the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in the step b) is 6: 0.9.
comparative example 2:
the production method of the stain-resistant and folding-resistant leather was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin is basically the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in the step b) is 6: 1.0.
comparative example 3:
the production method of the stain-resistant and folding-resistant leather was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin is basically the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in the step b) is 6: 1.5.
comparative example 4:
the production method of the stain-resistant and folding-resistant leather was the same as in example 1.
The preparation method of the epoxidized soybean oil-modified polyurethane resin is basically the same as that of example 1, except that the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in the step b) is 6: 1.6.
and (3) performance testing:
1) the production processes of examples 1-4 and comparative examples 1-4 were used to produce leather of 1.4-1.6mm, and the leather produced by each process was tested:
the test results are shown in the table:
(control group is a commercial leather with a thickness of 1.4-1.6 mm)
Compared with the examples 1-4 and the comparison group, the leather produced by the method of the invention has better folding resistance, wear resistance, yellowing resistance and hydrolysis resistance compared with the commercially available leather.
As compared with comparative examples 1 to 4 and examples 1 to 4, it can be seen that when the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer in step b) is 6: 1.1-1.4, the prepared leather has better bending resistance and abrasion resistance. The crosslinking density of the epoxy soybean oil modified polyurethane resin is increased along with the gradual increase of the content of the hexamethylene diisocyanate trimer which is dripped; therefore, the wear resistance of the prepared leather can be improved; however, as the crosslinking density of the epoxy soybean oil-modified polyurethane resin increases, the hardness of the epoxy soybean oil-modified polyurethane resin coating increases, and the flexibility of the leather decreases after the epoxy soybean oil-modified polyurethane resin penetrates into the leather, thereby decreasing the flexing resistance of the leather. From the above data, it can be seen that when the mass ratio of the mixed solution to the hexamethylene diisocyanate trimer is 6: 1.1-1.4, the prepared leather has better wear resistance and bending resistance.
2) The leather produced in examples 1 to 4 and the leather of the control group were examined for their antifouling effect. The test method comprises the following steps: painting on the leather surface by adopting an oily ball pen respectively, and then wiping by using a wet tissue. The test results were as follows:
(control group is a commercially available leather)
The detection results show that compared with commercially available leathers, the leathers produced by the method have better antifouling performance, are convenient for cleaning the dirt on the leather surface in the using process, and are suitable for further popularization and application.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. The production method of the antifouling folding-resistant leather is characterized by comprising the following steps:
s1: coating a layer of epoxidized soybean oil modified polyurethane resin on the surface of the leather, and baking for 90min at the temperature of 80-95 ℃;
s2: the baked skin is driedStanding the leather for 6h, and performing roller burnishing at the temperature of 100-110 ℃, wherein the roller burnishing is performed by a roller burnishing machine at the roller burnishing machine of 5-6kg/cm2；
S3: uniformly mixing the antifouling agent and the auxiliary agent, coating the mixture on the surface of the leather after the roller burnishing, and then baking the mixture for 60min at the temperature of 80-100 ℃;
s4: placing the leather baked in S3 at 80-85 deg.C, and rolling to 3-4kg/cm2Performing soup polishing treatment on the tumbling mill;
s5: and (4) tumbling the polished leather for 3min at normal temperature to obtain a finished leather product.
2. The method for producing an antifouling folding-resistant leather as claimed in claim 1, wherein the epoxidized soybean oil-modified polyurethane resin in S1 is coated to a thickness of 2.0 to 2.5 mm.
3. The method for producing antifouling folding-resistant leather according to claim 1 or 2, wherein the epoxidized soybean oil-modified polyurethane resin is prepared by the following steps:
a) the epoxy soybean oil and diethanol amine are mixed according to the mass ratio of 1.5: 1, uniformly mixing, heating to 60-65 ℃ under the protection of nitrogen, and reacting for 2.5 hours to obtain ring-opened soybean oil;
b) mixing polyethylene glycol, glycerol, dimethylolpropionic acid and ring-opened soybean oil according to a mass ratio of 1: 0.2: 0.5: 1, dropwise adding dibutyltin dilaurate into the mixed solution, uniformly mixing, heating to 50-55 ℃, and then mixing the mixed solution according to a mass ratio of 6: 1.1 to 1.4 drops of the mixture are added into hexamethylene diisocyanate trimer to be stirred and mixed, and the mixture is continuously reacted for 60 to 80min after the mixture is completely dropped to obtain a mixed component A;
c) dropwise adding triethylamine into the mixed component A, adding water for emulsification, adding a sodium hydroxide solution in the emulsification process to adjust the pH value of the system to 7-8, and preparing an aqueous mixed component B;
d) mixing the water-based mixed component B with isophorone diisocyanate according to a mass ratio of 8: 1 to obtain the epoxy soybean oil modified polyurethane resin.
4. The method for producing stain-resistant and folding-resistant leather as claimed in claim 3, wherein the amount of dibutyl tin dilaurate added in step b) is 0.1-0.3% by mass of the total system.
5. The method for producing antifouling folding-resistant leather according to claim 3, wherein the molar ratio of triethylamine in step c) to dimethylolpropionic acid in step b) is 1.2: 1.
6. the method for producing antifouling folding-resistant leather according to claim 3, wherein the concentration of the sodium hydroxide solution in step c) is 0.1 mol/L.
7. The method for producing antifouling folding-resistant leather according to claim 3, wherein the solid content of the aqueous mixture component B in step c) is 25%.
8. The method for producing stain-resistant and folding-resistant leather as claimed in claim 1, wherein the stain-resistant agent in S3 is AG81, and the auxiliary agent is pentaerythritol oleate; the mass ratio of the antifouling agent to the auxiliary agent is 3: 1.
9. the method for producing an antifouling folding-resistant leather as claimed in claim 8, wherein the coating thickness of the mixture of the antifouling agent and the auxiliary agent in S3 is 1-2 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010735449.8A CN111842082A (en) | 2020-07-28 | 2020-07-28 | Production method of antifouling folding-resistant leather |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010735449.8A CN111842082A (en) | 2020-07-28 | 2020-07-28 | Production method of antifouling folding-resistant leather |
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| CN111842082A true CN111842082A (en) | 2020-10-30 |
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| CN202010735449.8A Pending CN111842082A (en) | 2020-07-28 | 2020-07-28 | Production method of antifouling folding-resistant leather |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN115815094A (en) * | 2022-12-10 | 2023-03-21 | 浙江南龙皮业有限公司 | Anti-cracking coating agent for leather and leather coating method |
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