CN110846446A - Production process of waterproof leather - Google Patents
Production process of waterproof leather Download PDFInfo
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- CN110846446A CN110846446A CN201810948040.7A CN201810948040A CN110846446A CN 110846446 A CN110846446 A CN 110846446A CN 201810948040 A CN201810948040 A CN 201810948040A CN 110846446 A CN110846446 A CN 110846446A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B38/00—Ancillary operations in connection with laminating processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
- B32B5/022—Non-woven fabric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/02—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising animal or vegetable substances, e.g. cork, bamboo, starch
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B9/00—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00
- B32B9/04—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B9/047—Layered products comprising a layer of a particular substance not covered by groups B32B11/00 - B32B29/00 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material made of fibres or filaments
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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
-
- 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
-
- 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
-
- 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
-
- 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
- C14C3/04—Mineral tanning
-
- 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
- C14C3/08—Chemical tanning by organic agents
-
- 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
-
- 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
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/02—Coating on the layer surface on fibrous or filamentary layer
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Ceramic Engineering (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention discloses a production process of waterproof leather, which comprises the following steps: A. selecting materials: selecting a raw skin with proper width and thickness, and calculating the addition amount of other substances by taking the raw skin as 100 parts by weight; B. water returning: adding 400 parts by weight of 300-400 parts by weight of water into the rotary drum, controlling the water temperature to be between 40 and 50 ℃ to enable the rotary drum to recover to the fresh skin state, adding 1 to 3 parts by weight of formic acid to accelerate the water to permeate, and draining after continuously rotating for 60 to 80 min. According to the process, the production and processing process of the leather is smooth, the phenomenon of unsmooth work cannot occur in the whole process, the production efficiency of the leather is improved, the waterproof agent is added in the whole production process, the waterproof performance of the leather can be effectively improved, and meanwhile, the produced leather has high air permeability through the step M and the step N, so that the leather has market competitiveness, accords with the benefits of enterprises and is suitable for popularization.
Description
Technical Field
The invention relates to the technical field of leather production, in particular to a production process of waterproof leather.
Background
The leather is animal leather which is obtained by physical and chemical processing such as unhairing, tanning and the like and is denatured and not easy to rot, the leather is formed by tightly weaving natural protein fibers in a three-dimensional space, a special grain layer is arranged on the surface of the leather, the grain layer has natural grains and luster, and the hand feeling is comfortable, so that the leather has physical and chemical properties such as softness, tear resistance, bending resistance and the like, but the existing leather has poor waterproof and air permeability, the whole production process is complex and is not beneficial to the benefits of enterprises, and therefore, the production process of the waterproof leather is provided.
Disclosure of Invention
The invention aims to provide a production process of waterproof leather, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a production process of waterproof leather comprises the following steps:
A. selecting materials: selecting a raw skin with proper width and thickness, and calculating the addition amount of other substances by taking the raw skin as 100 parts by weight;
B. water returning: adding 400 parts by weight of 300-400 parts by weight of water into the rotary drum, controlling the water temperature to be between 40 and 50 ℃ to enable the rotary drum to recover to the fresh skin state, adding 1 to 3 parts by weight of formic acid to accelerate the water to permeate, and draining after continuously rotating for 60 to 80 min;
C. unhairing and degreasing: removing oil and fat in cells in the original skin and hair on the surface of the original skin to expose natural and fine grain surfaces;
D. liming: adding an impregnating agent and an alkaline substance into water to enable the raw skin to expand to a certain thickness so as to be beneficial to splitting, wherein in the process, the raw skin needs to be completely immersed into the water and lasts for 6-8 hours, and meanwhile, the impregnating agent comprises quicklime;
E. deliming and pickling: removing excessive alkali from the raw leather in the liming process, adding proper acid, and neutralizing the excessive alkali to reach the pH value (3.8-4.2) required by tanning;
F. retanning;
G. washing with water: adding 100 portions of water with the temperature of 25-35 ℃ and 120 portions of formic acid with the weight of 1-3 portions into the mixture, firstly carrying out rotation reaction for 10-15min, then adding 1-3 portions of formaldehyde catching agent with the weight of 1-3 portions, carrying out rotation reaction for 20-60min, and controlling the PH value to be 3.6-4.0;
H. adding a waterproof agent: adding 100-150 parts by weight of 35-45 ℃ water and 3-6 parts by weight of a water-proofing agent, and rotating for 6-12min, wherein the water-proofing agent is 9981;
I. dyeing: adding 2-4 parts by weight of penetrating agent, 1.5-3.5 parts by weight of formic acid, 0.2-0.8 part by weight of displaced tannin, 1-3 parts by weight of protein tannin, 1.5-3.2 parts by weight of melamine and 1.5-3.5 parts by weight of dispersed tannin, and performing rotation reaction for 60-80 min;
J. fat liquoring: carrying out greasing coating on the surface of the leather, wherein the PH value during greasing is controlled to be 5.0-5.5, the temperature is controlled to be 60-75 ℃, and the time is controlled to be 1-2 h;
K. spraying cations;
l, coating: the surface of the leather is coated, so that the attractiveness of the leather is improved;
m, adhering a surface layer: coating EVA resin adhesive on one surface of the leather, placing a surface layer formed by the super fiber non-woven fabric on the surface of the leather, and attaching to form a two-layer leather with a surface layer;
n, hot-pressing a resin layer: coating a non-woven fabric of a polyurethane elastomer on the upper surface of the surface layer, fusing the non-woven fabric into a film through a hot press, and then attaching the film to the surface layer to obtain the waterproof leather;
o, spraying a hand feeling agent;
and P, packaging and warehousing after the inspection is qualified.
Preferably, the step F is: adding 160-180 parts by weight of 35-45 ℃ water and 1-4 parts by weight of dye, firstly rotating in a tanning machine for 20-30min, then adding 5-8 parts by weight of chromium powder, 2-4 parts by weight of fatty aldehyde and 3-5 parts by weight of tearing-resistant grease, continuing to rotate for 30-40min, then adding 3-5 parts by weight of waterproof oil, continuing to rotate for 10-15min, and in the whole process, controlling the temperature in the tanning machine between 37-39 ℃ and the pH value between 5.0-5.5.
Preferably, the raw materials used in step K include cationic products, polyurethane resins, protein cationic products, oil wax, cationic oils, nonionic high-covering polymers and nonionic polyurethane resins, and the components in parts by weight thereof are as follows: 45-55 parts of cationic product, 60-70 parts of polyurethane resin, 120 parts of protein cationic product, 90-110 parts of oil wax, 25-30 parts of cationic oil, 40-50 parts of nonionic high-covering polymer and 30-40 parts of nonionic polyurethane resin.
Preferably, the step L comprises base coating, intermediate coating and top coating, and the base coating is base coating by using a cationic wax agent and a coating in which epoxy resin is dissolved in water and baking; the middle coating is to use leather to be connected with a coating in which epoxy resin is dissolved in water for middle coating and baking; the top coating is carried out by using a coating with epoxy resin, acrylic resin, leather cracking resin and leather pigment dissolved in water, and then baking.
Preferably, the raw materials used in step O comprise acrylamide, glycidyl methacrylate, aqueous polyfluoro emulsion, defoamer, high molecular hand feeling agent, organic bentonite, preservative and water, and the components in parts by weight are as follows: 40-50 parts of acrylamide, 5-10 parts of glycidyl methacrylate, 30-40 parts of aqueous polyfluoro emulsion, 1-3 parts of defoaming agent, 3-5 parts of high-molecular hand feeling agent, 0.5-2.5 parts of organic bentonite, 1-3 parts of preservative and the balance of water.
Compared with the prior art, the invention has the following beneficial effects:
according to the process, the production and processing process of the leather is smooth, the phenomenon of unsmooth work cannot occur in the whole process, the production efficiency of the leather is improved, the waterproof agent is added in the whole production process, the waterproof performance of the leather can be effectively improved, and meanwhile, the produced leather has high air permeability through the step M and the step N, so that the leather has market competitiveness, accords with the benefits of enterprises and is suitable for popularization.
Drawings
FIG. 1 is a schematic view of the process of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in 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.
Referring to fig. 1, a production process of waterproof leather includes the following steps:
A. selecting materials: selecting a raw skin with proper width and thickness, and calculating the addition amount of other substances by taking the raw skin as 100 parts by weight;
B. water returning: adding 400 parts by weight of 300-400 parts by weight of water into the rotary drum, controlling the water temperature to be between 40 and 50 ℃ to enable the rotary drum to recover to the fresh skin state, adding 1 to 3 parts by weight of formic acid to accelerate the water to permeate, and draining after continuously rotating for 60 to 80 min;
C. unhairing and degreasing: removing oil and fat in cells in the original skin and hair on the surface of the original skin to expose natural and fine grain surfaces;
D. liming: adding an impregnating agent and an alkaline substance into water to enable the raw skin to expand to a certain thickness so as to be beneficial to splitting, wherein in the process, the raw skin needs to be completely immersed into the water and lasts for 6-8 hours, and meanwhile, the impregnating agent comprises quicklime;
E. deliming and pickling: removing excessive alkali from the raw leather in the liming process, adding proper acid, and neutralizing the excessive alkali to reach the pH value (3.8-4.2) required by tanning;
F. retanning;
G. washing with water: adding 100 portions of water with the temperature of 25-35 ℃ and 120 portions of formic acid with the weight of 1-3 portions into the mixture, firstly carrying out rotation reaction for 10-15min, then adding 1-3 portions of formaldehyde catching agent with the weight of 1-3 portions, carrying out rotation reaction for 20-60min, and controlling the PH value to be 3.6-4.0;
H. adding a waterproof agent: adding 100-150 parts by weight of 35-45 ℃ water and 3-6 parts by weight of a water-proofing agent, and rotating for 6-12min, wherein the water-proofing agent is 9981;
I. dyeing: adding 2-4 parts by weight of penetrating agent, 1.5-3.5 parts by weight of formic acid, 0.2-0.8 part by weight of displaced tannin, 1-3 parts by weight of protein tannin, 1.5-3.2 parts by weight of melamine and 1.5-3.5 parts by weight of dispersed tannin, and performing rotation reaction for 60-80 min;
J. fat liquoring: carrying out greasing coating on the surface of the leather, wherein the PH value during greasing is controlled to be 5.0-5.5, the temperature is controlled to be 60-75 ℃, and the time is controlled to be 1-2 h;
K. spraying cations;
l, coating: the surface of the leather is coated, so that the attractiveness of the leather is improved;
m, adhering a surface layer: coating EVA resin adhesive on one surface of the leather, placing a surface layer formed by the super fiber non-woven fabric on the surface of the leather, and attaching to form a two-layer leather with a surface layer;
n, hot-pressing a resin layer: coating a non-woven fabric of a polyurethane elastomer on the upper surface of the surface layer, fusing the non-woven fabric into a film through a hot press, and then attaching the film to the surface layer to obtain the waterproof leather;
o, spraying a hand feeling agent;
p, packing and warehousing after being qualified, through the process, the production and processing process of the leather can be smooth, the phenomenon of unsmooth work can not occur in the whole process, so that the production efficiency of the leather is improved, the waterproof agent is added in the whole production process, the waterproof performance of the leather can be effectively improved, and meanwhile, through the step M and the step N, the produced leather has high air permeability, so that the leather has more market competitiveness, accords with the benefits of enterprises and is suitable for popularization.
Step F is as follows: adding 160-180 parts by weight of 35-45 ℃ water and 1-4 parts by weight of dye, firstly rotating in a tanning machine for 20-30min, then adding 5-8 parts by weight of chromium powder, 2-4 parts by weight of fatty aldehyde and 3-5 parts by weight of tearing-resistant grease, continuing to rotate for 30-40min, then adding 3-5 parts by weight of waterproof oil, continuing to rotate for 10-15min, and in the whole process, controlling the temperature in the tanning machine between 37-39 ℃ and the pH value between 5.0-5.5.
The raw materials used in the step K comprise a cationic product, polyurethane resin, a protein cationic product, oil wax, cationic oil, a nonionic high-covering polymer and nonionic polyurethane resin, and the components in parts by weight are as follows: 45-55 parts of cationic product, 60-70 parts of polyurethane resin, 120 parts of protein cationic product, 90-110 parts of oil wax, 25-30 parts of cationic oil, 40-50 parts of nonionic high-covering polymer and 30-40 parts of nonionic polyurethane resin.
Step L comprises base coating, intermediate coating and top coating, wherein the base coating is carried out by using a coating in which a cationic wax agent and epoxy resin are dissolved in water and then is baked; the middle coating is to use leather to be connected with a coating in which epoxy resin is dissolved in water for middle coating and baking; the top coating is carried out by using a coating with epoxy resin, acrylic resin, leather cracking resin and leather pigment dissolved in water, and then baking.
The raw materials used in the step O comprise acrylamide, glycidyl methacrylate, aqueous polyfluoro emulsion, a defoaming agent, a high-molecular hand feeling agent, organic bentonite, a preservative and water, and the components in parts by weight are as follows: 40-50 parts of acrylamide, 5-10 parts of glycidyl methacrylate, 30-40 parts of aqueous polyfluoro emulsion, 1-3 parts of defoaming agent, 3-5 parts of high-molecular hand feeling agent, 0.5-2.5 parts of organic bentonite, 1-3 parts of preservative and the balance of water.
When the leather production process is used, the production and processing process of the leather is smooth, the phenomenon of unsmooth work can not occur in the whole process, the production efficiency of the leather is improved, the waterproof agent is added in the whole production process, the waterproof performance of the leather can be effectively improved, and meanwhile, the produced leather has high air permeability through the step M and the step N, so that the leather has market competitiveness, accords with the benefits of enterprises and is suitable for popularization.
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.
Claims (5)
1. The production process of the waterproof leather is characterized by comprising the following steps: the production process comprises the following steps:
A. selecting materials: selecting a raw skin with proper width and thickness, and calculating the addition amount of other substances by taking the raw skin as 100 parts by weight;
B. water returning: adding 400 parts by weight of 300-400 parts by weight of water into the rotary drum, controlling the water temperature to be between 40 and 50 ℃ to enable the rotary drum to recover to the fresh skin state, adding 1 to 3 parts by weight of formic acid to accelerate the water to permeate, and draining after continuously rotating for 60 to 80 min;
C. unhairing and degreasing: removing oil and fat in cells in the original skin and hair on the surface of the original skin to expose natural and fine grain surfaces;
D. liming: adding an impregnating agent and an alkaline substance into water to enable the raw skin to expand to a certain thickness so as to be beneficial to splitting, wherein in the process, the raw skin needs to be completely immersed into the water and lasts for 6-8 hours, and meanwhile, the impregnating agent comprises quicklime;
E. deliming and pickling: removing excessive alkali from the raw leather in the liming process, adding proper acid, and neutralizing the excessive alkali to reach the pH value (3.8-4.2) required by tanning;
F. retanning;
G. washing with water: adding 100 portions of water with the temperature of 25-35 ℃ and 120 portions of formic acid with the weight of 1-3 portions into the mixture, firstly carrying out rotation reaction for 10-15min, then adding 1-3 portions of formaldehyde catching agent with the weight of 1-3 portions, carrying out rotation reaction for 20-60min, and controlling the PH value to be 3.6-4.0;
H. adding a waterproof agent: adding 100-150 parts by weight of 35-45 ℃ water and 3-6 parts by weight of a water-proofing agent, and rotating for 6-12min, wherein the water-proofing agent is 9981;
I. dyeing: adding 2-4 parts by weight of penetrating agent, 1.5-3.5 parts by weight of formic acid, 0.2-0.8 part by weight of displaced tannin, 1-3 parts by weight of protein tannin, 1.5-3.2 parts by weight of melamine and 1.5-3.5 parts by weight of dispersed tannin, and performing rotation reaction for 60-80 min;
J. fat liquoring: carrying out greasing coating on the surface of the leather, wherein the PH value during greasing is controlled to be 5.0-5.5, the temperature is controlled to be 60-75 ℃, and the time is controlled to be 1-2 h;
K. spraying cations;
l, coating: the surface of the leather is coated, so that the attractiveness of the leather is improved;
m, adhering a surface layer: coating EVA resin adhesive on one surface of the leather, placing a surface layer formed by the super fiber non-woven fabric on the surface of the leather, and attaching to form a two-layer leather with a surface layer;
n, hot-pressing a resin layer: coating a non-woven fabric of a polyurethane elastomer on the upper surface of the surface layer, fusing the non-woven fabric into a film through a hot press, and then attaching the film to the surface layer to obtain the waterproof leather;
o, spraying a hand feeling agent;
and P, packaging and warehousing after the inspection is qualified.
2. The production process of waterproof leather according to claim 1, characterized in that: the step F is as follows: adding 160-180 parts by weight of 35-45 ℃ water and 1-4 parts by weight of dye, firstly rotating in a tanning machine for 20-30min, then adding 5-8 parts by weight of chromium powder, 2-4 parts by weight of fatty aldehyde and 3-5 parts by weight of tearing-resistant grease, continuing to rotate for 30-40min, then adding 3-5 parts by weight of waterproof oil, continuing to rotate for 10-15min, and in the whole process, controlling the temperature in the tanning machine between 37-39 ℃ and the pH value between 5.0-5.5.
3. The production process of waterproof leather according to claim 1, characterized in that: the raw materials used in the step K comprise cationic products, polyurethane resin, protein cationic products, oil wax, cationic oil, nonionic high-covering polymer and nonionic polyurethane resin, and the components in parts by weight are as follows: 45-55 parts of cationic product, 60-70 parts of polyurethane resin, 120 parts of protein cationic product, 90-110 parts of oil wax, 25-30 parts of cationic oil, 40-50 parts of nonionic high-covering polymer and 30-40 parts of nonionic polyurethane resin.
4. The production process of waterproof leather according to claim 1, characterized in that: the step L comprises a base coat, a middle coat and a top coat, wherein the base coat is prepared by using a coating in which a cationic wax agent and epoxy resin are dissolved in water and baking; the middle coating is to use leather to be connected with a coating in which epoxy resin is dissolved in water for middle coating and baking; the top coating is carried out by using a coating with epoxy resin, acrylic resin, leather cracking resin and leather pigment dissolved in water, and then baking.
5. The production process of waterproof leather according to claim 1, characterized in that: the raw materials used in the step O comprise acrylamide, glycidyl methacrylate, aqueous polyfluoro emulsion, defoaming agent, high-molecular hand feeling agent, organic bentonite, preservative and water, and the components in parts by weight are as follows: 40-50 parts of acrylamide, 5-10 parts of glycidyl methacrylate, 30-40 parts of aqueous polyfluoro emulsion, 1-3 parts of defoaming agent, 3-5 parts of high-molecular hand feeling agent, 0.5-2.5 parts of organic bentonite, 1-3 parts of preservative and the balance of water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810948040.7A CN110846446A (en) | 2018-08-20 | 2018-08-20 | Production process of waterproof leather |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810948040.7A CN110846446A (en) | 2018-08-20 | 2018-08-20 | Production process of waterproof leather |
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| CN110846446A true CN110846446A (en) | 2020-02-28 |
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| CN201810948040.7A Pending CN110846446A (en) | 2018-08-20 | 2018-08-20 | Production process of waterproof leather |
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