Cattlehide oil wax sofa leather and production method thereof

Abstract

The invention belongs to the technical field of industrial leather manufacturing, and particularly relates to cattlehide oil wax sofa leather and a production method thereof.The production method comprises the steps that blue leather is sequentially subjected to shaving, first-time rewetting, neutralizing, filling, first-time fat liquoring, bulging and horse building, wringing stretching and vacuum drying, and then a leather blank is obtained; the leather blank is subjected to the treatment processes of oscillation, leather buffing, resin rolling, oscillation, second-time rewetting, drum-back dyeing, second-time fat liquoring, wet tightening, moisture regaining and milling, toggling and wax rolling; the process of rolling the resin comprises the following steps: carrying out roller coating on the leather blank twice in sequence, carrying out roller coating on the leather blank for two times, carrying out roller coating on the leather blank for the first time according to an application amount of 12-14g per foot of the leather blank for the first time, and carrying out roller coating on the leather blank for the second time according to an application amount of 6-8g per foot of the leather blank for the second time; the leather blank subjected to resin rolling is subjected to aging and drying treatment; the wax rolling comprises the following steps: coating the leather blank with wax by a roller, wherein the applying amount of the roller coating is 6-8 g per foot of the leather blank by the roller coating; the leather blank obtained after wax rolling is subjected to aging and drying treatment; cracking lines similar to crocodile lines or cracked ceramic can be obtained.

Description

Technical Field

[0001] The present application relates to the technical field of industrial leather manufacturing, and more specifically, to a cowhide oil wax sofa leather and a production method thereof. Background Art

[0002] Wet blue cowhide is a semi-finished product in the cowhide processing process. Wet blue cowhide is mainly used to produce clothing, shoes and sofa leather, etc. The sofa leather produced has a smooth surface or a grainy appearance, and can also be embossed to obtain a special appearance, but it is difficult to obtain cracking patterns similar to crocodile patterns or crackle porcelain without embossing, so it is not conducive to expanding the diversity of cowhide sofa leather patterns. Summary of the invention

[0003] The present application is provided to solve the above defects existing in the prior art. A cowhide oil wax sofa leather and a production method thereof are needed, providing a sofa leather capable of preparing crocodile pattern or cracked porcelain pattern, giving the leather a unique appearance.

[0004] In a first aspect of the present application, a method for producing a cowhide oil wax sofa leather is provided, the method comprising: the blue leather is sequentially subjected to shaving, first rewetting, neutralization, filling, first greasing, drumming, squeezing and stretching, and vacuum drying to obtain a leather blank, the leather blank being subjected to the processes of oscillation, grinding, resin rolling, oscillation, second rewetting, drum dyeing, second greasing, wet stretching, moisture regain and softening, stretching and wax rolling; the resin rolling process comprises: applying cracking resin to the leather blank twice in succession, the first application amount being 12-14g per foot of leather blank, and the second application amount being 6-8g per foot of leather blank; the leather blank after roller coating is subjected to aging and drying treatment; the wax rolling comprises: applying wax roller to the leather blank, the application amount being 6-8g per foot of cowhide roller coating; the leather blank after wax rolling is subjected to aging and drying treatment.

[0005] In a second aspect of the present application, there is provided a cowhide oil wax sofa leather obtained by the production method of the cowhide oil wax sofa leather described in any embodiment of the present application.

[0006] The cowhide oil wax sofa leather and its production method provided in each embodiment of the present application are: the blue leather is subjected to roller resin after shaving, the first rewetting, neutralization, filling, the first greasing, drumming, water squeezing and stretching, vacuum drying, vibration, and leather grinding. The roller resin is selected from cracking resin, and the amount of cracking resin is controlled to control the effect of cracking of the cowhide grain. The softness and strength of the leather are controlled by the second greasing by drumming, and the color change effect and smooth feel of the surface are further controlled by rolling wax, which solves the rough feel caused by cracking, and at the same time improves the water vapor permeability of the oil wax leather, giving the leather a unique appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In the drawings, which are not necessarily drawn to scale, the same reference numerals may describe similar parts in different views. The same reference numerals with letter suffixes or different letter suffixes may represent different instances of similar parts. The accompanying drawings generally illustrate various embodiments by way of example and not limitation, and together with the specification and claims, are used to illustrate the embodiments applied for. When appropriate, the same reference numerals are used throughout the drawings to refer to the same or similar parts. Such embodiments are illustrative and are not intended to be exhaustive or exclusive embodiments of the present apparatus or method.

[0008] Figure 1 A diagram showing a cowhide oil wax sofa leather according to Example 1 of the present application is shown. DETAILED DESCRIPTION

[0009] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific implementation examples. The embodiments of the present application are further described in detail below in conjunction with the accompanying drawings and specific implementation examples, but are not intended to limit the present application.

[0010] The words "first", "second" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0011] According to an embodiment of the present application, a production method for cowhide oil wax sofa leather is provided, and the production method comprises: the blue leather is sequentially subjected to shaving, first rewetting, neutralization, filling, first greasing, drumming, squeezing and stretching, and vacuum drying to obtain a leather blank, and the leather blank is subjected to the processes of oscillation, grinding, roller resin, oscillation, second rewetting, drum dyeing, second greasing, wet stretching, moisture regain and softening, stretching board, and roller waxing; the roller resin process comprises: rolling cracking resin on the leather blank twice in succession, the application amount of the first roller coating is 12-14g per foot of cowhide roller coating, and the application amount of the second roller coating is 6-8g per foot of cowhide roller coating; the leather blank after the resin rolling is subjected to aging and drying treatment; the roller waxing comprises: rolling wax on the leather blank, the application amount of the roller coating is 6-8g per foot of cowhide roller coating; the leather blank after the wax rolling is subjected to aging and drying treatment.

[0012] In the present application, blue leather is the abbreviation of wet blue cowhide, and the leather blank is obtained by fat-liquoring and drying the wet blue cowhide.

[0013] In the present application, cracking resin is selected for the leather blank, and the amount of cracking resin is controlled, so that the cracked texture of the sofa leather finally prepared is similar to the effect of crocodile texture or cracked porcelain, and the textures are cracked. The softness and strength of the leather are controlled by the first fatliquoring and the second fatliquoring. The color change effect and smooth feel of the surface are further controlled by roller wax, which solves the rough feel caused by cracking, and at the same time improves the water vapor permeability of the oil wax leather, giving the leather a unique appearance effect.

[0014] In some embodiments, the blue leather has a thickness of 1.1-1.15 mm after shaving. The blue leather has a uniform thickness after shaving.

[0015] In some embodiments, the first rewetting includes: placing the shaved blue leather in a rewetting solution containing oxalic acid, L140 rewetting agent and water in a rotating drum at room temperature, rotating it, draining it and washing it with water, wherein the amount of oxalic acid added is 0.8-1.2% of the weight of the blue leather, the amount of L140 rewetting agent added is 0.4-0.6% of the weight of the blue leather, and the amount of water added is 190-210% of the weight of the blue leather; the rotation time is 20-40 minutes; and the pH of the rewetting solution is 3.5-3.6.

[0016] In some embodiments, a washing solution is added after the first rewetting after the liquid is drained, the washing solution includes water and PAK-N / C, the amount of water added to the washing solution is 140-160% of the weight of the blue leather, and the amount of PAK-N / C added is 0.8-1.2% of the weight of the blue leather. The washing is carried out at 30-37°C.

[0017] In some embodiments, the neutralization comprises: adding sodium formate and phosphate multifunctional additives in a rotary drum, neutralizing the blue leather after the first rewetting treatment, and then draining, washing, and draining in sequence. After adding the washing solution in the rewetting washing, no drainage is performed, and then sodium formate and phosphate multifunctional additives are added for neutralization treatment to increase the pH value of the leather and promote the penetration of the material. The phosphate multifunctional additive can be CRII (purchased from Qihe Lihou Chemical Co., Ltd.).

[0018] In some embodiments, the weight of sodium formate added is 0.8-1.2% of the weight of the blue leather, and the amount of the phosphate multifunctional additive added is 0.8-1.2% of the weight of the blue leather. In some embodiments, the time of the drum rotation treatment during the neutralization process is 35-45 minutes. In some embodiments, after adding sodium formate and phosphate multifunctional additives, the pH value of the mixed solution in the drum is 4.7-4.9.

[0019] In some embodiments, the filling includes: in a rotating drum, the neutralized blue leather is mixed with a filling mixed solution containing water, dispersant, melamine, synthetic oil, wattle bark tannin, chestnut tannin and phosphate multifunctional additives, and then drained, washed and drained in sequence; the amount of water added is 95-105% of the weight of the blue leather, the amount of the dispersant added is 1.8-2.2% of the weight of the blue leather, the amount of melamine added is 2-4% of the weight of the blue leather, the amount of synthetic oil added is 0.8-1.2% of the weight of the blue leather, the amount of wattle bark tannin added is 12-14% of the weight of the blue leather, the amount of chestnut tannin added is 4-6% of the weight of the blue leather, and the amount of phosphate multifunctional additives added is 0.8-1.2% of the weight of the blue leather. The filling mixed solution is added to the drum after draining. By adding tannin and tannin extract, the firmness, fullness and feel of the leather are improved.

[0020] In some embodiments, during the filling process, water, dispersant, melamine, synthetic oil, wattle tannin, chestnut tannin and phosphate multifunctional additives are added in sequence, the drum is rotated for 15-25 minutes after the dispersant is added, the drum is rotated for 15-25 minutes after the melamine is added, the drum is rotated for 6-13 minutes after the synthetic oil is added, and the drum is rotated for 160-200 minutes after the wattle tannin, chestnut tannin and phosphate multifunctional additives are added.

[0021] In some embodiments, the phosphate-based multifunctional adjuvant is CRII.

[0022] In some embodiments, the filling further comprises washing and draining the blue leather after the filling mixed solution treatment, wherein the washing comprises: mixing the blue leather with a washing solution, wherein the washing solution comprises water and oxalic acid, wherein the amount of water added to the washing solution is 95-105% of the weight of the blue leather (initial blue leather), and the amount of oxalic acid added is 0.8-1.2% of the weight of the blue leather. In some embodiments, the washing after the filling treatment is performed at a temperature of 30-40°C.

[0023] In some embodiments, the first fatting includes: in a rotating drum, the filled blue leather is mixed with a first fatting mixed solution containing water, synthetic oil, sulfited fish oil, and oxalic acid, wherein the amount of water added is 190-210% of the weight of the blue leather, the amount of synthetic oil added is 1-3% of the weight of the blue leather, the amount of sulfited fish oil added is 0.8-1.2% of the weight of the blue leather, and the amount of oxalic acid added is 0.8-1.2% of the weight of the blue leather. The first fatting mixed solution is added after filling and draining. The synthetic oil acts as a dispersant.

[0024] In some embodiments, the first fatliquoring is performed at a temperature of 40-50°C.

[0025] In some embodiments, the second rewetting includes: placing the leather blank after oscillation treatment in a rewetting solution containing ammonia water, L140 rewetting agent and water in a rotating drum at room temperature, rotating and draining, washing and draining, the amount of ammonia water added is 1-2% of the weight of the leather blank, the amount of L140 rewetting agent (purchased from Jiade Refining Technology (Yantai) Co., Ltd.) added is 0.4-0.6% of the weight of the leather blank, and the amount of water added is 190-210% of the weight of the leather blank; the rotation time is 50-70 minutes.

[0026] In some embodiments, the drum dyeing comprises: in a rotary drum, the leather blank after the second rewetting treatment is mixed with a dyeing solution containing water, dye, leveling agent and SQ160 and subjected to a rotary treatment. The amount of water added to the dyeing solution is 70-90% of the weight of the leather blank, the amount of leveling agent added is 0.4-0.6% of the weight of the leather blank, and the amount of SQ160 added is 1-3% of the weight of the leather blank. The amount of dye added is set as required. After adding the leveling agent, the leather blank is subjected to a rotary treatment for 25-35 minutes, and after adding SQ160, the leather blank is subjected to a rotary treatment for 15-25 minutes.

[0027] In some embodiments, the second fatliquoring includes: in a rotary drum, sequentially mixing the leather blank after the drum dyeing treatment with a mixed solution containing water, fatty aldehyde, SQ-610 (FOREVER TRUTH CORP), MK (DERUI YUHUA TRADING LLC), DB (purchased from German Tumpler Company), 30L (purchased from Buckman Laboratory Chemical (Shanghai) Co., Ltd.) and HCOOH, wherein the amount of water added is 190-210% of the weight of the leather blank, the amount of fatty aldehyde added is 0.8-1.2% of the weight of the leather blank, the amount of SQ-610 added is 4-6% of the weight of the leather blank, the amount of MK added is 4-6% of the weight of the leather blank, the amount of phospholipid added is 4-6% of the weight of the leather blank, the amount of mildew inhibitor added is 0.05-0.15% of the weight of the leather blank, and the amount of HCOOH added is 1.5-2.5% of the weight of the leather blank. The softness of the leather can be improved by the first fatliquoring and the second fatliquoring process.

[0028] In some embodiments, the temperature of the second fat addition is 60-80°C.

[0029] In some embodiments, water, fatty aldehyde, SQ-610, MK, and DB are first added and rotated for 15-25 minutes, then 30L is added and rotated for 35-45 minutes, and finally HCOOH is added and rotated for 15-25 minutes.

[0030] In some embodiments, the leather blank after the resin rolling is subjected to aging and drying treatment, and the temperature of the drying treatment is 150-170°C.

[0031] In some embodiments, the wax used in the wax rolling process is FI-677. The leather blank after wax rolling is subjected to aging and drying treatment, and the temperature of the drying treatment is 150-160°C.

[0032] In some embodiments, after the board is stretched, trimming, classification, lining and the first ironing process are performed. In some embodiments, the conditions of the first ironing process include: temperature of 90-110°C, pressure of 50-70 bar, and speed of 6-7 r / min. The lining treatment process is to seal the flesh surface to prevent leather fibers from falling off and contaminating the leather surface.

[0033] In some embodiments, wet stretching is performed by stretching and drying on a stretching machine.

[0034] In some embodiments, the production method further comprises: the leather blank after rolling wax is sequentially aged and ironed for a second time to obtain the leather blank, and the leather blank is subjected to spray bonding, aging, ironing for a third time and starch treatment.

[0035] In some embodiments, the conditions for the second ironing are: temperature of 100-120° C., pressure of 30-40 bar, and rotation speed of 6-7 r / min.

[0036] In some embodiments, the spraying includes: the spraying includes: spraying a spraying mixed solution containing polyurethane emulsion, water, solvent, and penetrant on the ironed leather blank, and the spraying amount of the mixed solution is 2.0-2.2g of the mixed solution per foot of the leather blank. The polyurethane emulsion can be RU-3961 (Stahl Fine Coatings (Suzhou) Co., Ltd.). The solvent can be ECS (Stahl Fine Coatings (Suzhou) Co., Ltd.). The penetrant can be PT-4235 (Stahl Fine Coatings (Suzhou) Co., Ltd.).

[0037] In some embodiments, the weight proportions of the polyurethane emulsion, water, solvent and penetrant in the spray-on mixed solution are 190-210 parts, 90-110 parts, 40-60 parts and 40-60 parts respectively.

[0038] In some embodiments, the spraying step is performed at a temperature of 120-130°C.

[0039] The spraying is then carried out using a spray gun. The coating on the surface of the leather blank can be made more solid by spraying the mixed solution.

[0040] In some embodiments, the conditions for the third ironing are: temperature of 100-120° C., pressure of 30-40 bar, and rotation speed of 6-7 r / min.

[0041] In some embodiments, the paste treatment includes: applying a paste containing color-changing wax, acrylic emulsion, polyurethane adhesive resin, water and dye water to the leather blank after the third ironing treatment, and the coating amount of the paste is 1.0-1.2g per foot of the leather blank.

[0042] The color-changing wax in the batter can be FI-18-988 (Stahl Fine Coatings (Suzhou) Co., Ltd.), the acrylic emulsion can be RA-2356 (Stahl Fine Coatings (Suzhou) Co., Ltd.), and the polyurethane adhesive resin can be RU-3989 (Stahl Fine Coatings (Suzhou) Co., Ltd.). The dyeing water includes a colorant and water, and the color and type of the colorant are selected according to needs. The batter treatment process is to spray coloring on the surface of the leather blank to achieve a specified color.

[0043] In some embodiments, the weight proportions of the color-changing wax, acrylic emulsion, polyurethane adhesive resin, water and dye water in the dough are 40-60 parts, 70-90 parts, 40-60 parts, 140-160 parts and 70-90 parts respectively.

[0044] In some embodiments, the batter treatment further comprises drying the leather blank after the batter coating, and the drying temperature is 120-130°C.

[0045] In some embodiments, the batter treatment is followed by surface treatment of the finished product, aging, and a fourth ironing.

[0046] In some embodiments, the surface treatment of the finished product includes: applying a surface treatment solution containing polyurethane brightener, casein, water, crosslinking agent and hand feeling agent to the leather blank after the surface slurry treatment, and the coating amount of the surface treatment solution is 1.8-2.0g per foot of the leather blank. The surface treatment process can provide protection for the surface of the sofa leather finished product to prevent fading, and can also improve the stain resistance, dry rubbing resistance and wet rubbing resistance.

[0047] In some embodiments, the polyurethane brightener includes polyurethane brightener 301A and polyurethane brightener H5. The casein may be BI-18-788. The cross-linking agent may be CK. The hand feeling agent may be A-780.

[0048] In some embodiments, the weight proportions of polyurethane brightener 301A, polyurethane brightener H5, casein, water, crosslinking agent and hand feeling agent in the surface treatment solution are 70-90 parts, 15-25 parts, 25-35 parts, 55-65 parts, 1-3 parts and 2-4 parts respectively.

[0049] In some embodiments, the surface treatment further comprises drying the leather blank after being coated with the surface treatment solution, and the drying temperature is 120-130°C.

[0050] In some embodiments, the conditions for the fourth ironing are: temperature of 90-110° C., pressure of 10-20 bar, and rotation speed of 6-7 r / min.

[0051] In some embodiments, after the fourth ironing, a grade check can be performed as needed.

[0052] According to the embodiments of the present application, there is also provided a cowhide oil wax sofa leather obtained by the production method of the cowhide oil wax sofa leather described in any embodiment of the present application.

[0053] Example 1 (1) Shaving, the thickness after shaving is 1.1-1.15mm.

[0054] (2) The first rewetting process is to place the shaved blue leather in a rewetting solution containing oxalic acid, L140 rewetting agent and water, rotate it, drain it and wash it with water. The amount of oxalic acid added is 1% of the weight of the blue leather, the amount of L140 rewetting agent added is 0.5% of the weight of the blue leather, and the amount of water added is 200% of the weight of the blue leather. The rotation time is 30 minutes. The pH of the rewetting solution is 3.5. After draining during rewetting, a washing solution is added, the washing solution includes water and PAK-N / C, the amount of water added to the washing solution is 150% of the weight of the blue leather, and the amount of PAK-N / C added is 1% of the weight of the blue leather. The washing is carried out at 35°C.

[0055] (3) Neutralization: adding sodium formate and phosphate multifunctional additives into a drum to neutralize the blue leather after the first rewetting treatment, and then draining, washing and draining in sequence; the weight of the added sodium formate is 1% of the weight of the blue leather, and the amount of the added phosphate multifunctional additives is 1% of the weight of the blue leather; after adding the sodium formate and phosphate multifunctional additives, the pH value of the mixed solution in the drum is 4.8.

[0056] (4) Filling: In a rotating drum, the neutralized blue leather is mixed with a filling mixed solution containing water, a dispersant, melamine, a synthetic oil, wattle bark extract, chestnut tannin extract and CRII, and then drained, washed and drained in sequence; the amount of water added to the mixed solution is 95-105% of the weight of the blue leather, the amount of the dispersant added is 2% of the weight of the blue leather, the amount of melamine added is 3% of the weight of the blue leather, the amount of the synthetic oil added is 10% of the weight of the blue leather, and the amount of the blue leather added is 10% of the weight of the blue leather. The amount of wattle bark tannin added is 1% of the weight of the blue bark, the amount of chestnut tannin added is 5% of the weight of the blue bark, and the amount of CRII added is 1% of the weight of the blue bark; the drum rotation time after adding the dispersant is 20 minutes, the drum rotation time after adding melamine is 20 minutes, the drum rotation time after adding the synthetic oil is 10 minutes, and the drum rotation time after adding the wattle bark tannin, chestnut tannin and CRII is 180 minutes.

[0057] (5) The first fatting is performed by mixing the filled blue leather with a first fatting mixed solution containing water, synthetic oil, sulfited fish oil and oxalic acid in a rotating drum at 45° C., wherein the amount of water added is 200% of the weight of the blue leather, the amount of synthetic oil added is 2% of the weight of the blue leather, the amount of sulfited fish oil added is 1% of the weight of the blue leather, and the amount of oxalic acid added is 1% of the weight of the blue leather.

[0058] (6) Take out the drum and mount the horse. Take out the blue drum, mount the horse and let it stand.

[0059] (7) Water squeezing and stretching: the blue leather is squeezed and stretched through the pressing plate.

[0060] (8) Vacuum drying: drying the leather blank under vacuum conditions.

[0061] (9) Oscillation.

[0062] (10) Grinding leather.

[0063] (11) Roller resin: Cracking resin (acrylic) LAMBINDERCG (Lamberti, Italy) is roll-coated on the leather twice in succession. The application amount of the first roll coating is 12-14 g per foot of leather, and the application amount of the second roll coating is 6-8 g per foot of leather.

[0064] (12) Oscillation.

[0065] (13) The second rewetting process is to place the leather blank after the oscillation treatment in a rewetting solution containing ammonia water, L140 rewetting agent and water in a rotating drum at room temperature, and then drain, wash and drain. The amount of ammonia water added is 1.5% of the weight of the leather blank, the amount of L140 rewetting agent (Jia De Jing Hua Technology (Yantai) Co., Ltd.) added is 0.5% of the weight of the leather blank, and the amount of water added is 200% of the weight of the leather blank. The rotation time is 60 minutes.

[0066] (14) Drum dyeing: In a drum, the leather after the second rewetting treatment is mixed with a dyeing solution containing water, dye, leveling agent and SQ160 and then rotated. The amount of water added is 80% of the weight of the leather, the amount of leveling agent added is 0.5% of the weight of the leather, the amount of SQ160 added is 2% of the weight of the leather, and the amount of dye added is set according to needs. After adding the leveling agent, the leather is rotated for 30 minutes, and after adding SQ160, the leather is rotated for 20 minutes.

[0067] (15) The second fatliquoring, in a drum, sequentially mixing the leather blank after the drum dyeing treatment with a mixed solution containing water, fatty aldehyde, SQ-610, MK, DB, 30L and HCOOH; first adding water, fatty aldehyde, SQ-610, MK and DB and rotating for 20 minutes, then adding 30L and rotating for 40 minutes, and finally adding HCOOH and rotating for 20 minutes; the amount of water added is 200% of the weight of the leather blank, the amount of fatty aldehyde added is 1% of the weight of the leather blank, the amount of SQ-610 added is 5% of the weight of the leather blank, the amount of MK added is 5% of the weight of the leather blank, the amount of phospholipid added is 5% of the weight of the leather blank, the amount of mildew inhibitor added is 0.1% of the weight of the leather blank, and the amount of HCOOH added is 2% of the weight of the leather blank; during the second fatliquoring process, the pH of the added mixed solution is 3.8±0.1.

[0068] (16) Wet stretching: stretching and drying on a stretching machine.

[0069] (17) The blue leather becomes soft and the bottom and top become wet.

[0070] (18) Tension board.

[0071] (18) Trimming.

[0072] (19) Classification.

[0073] (20) Inside the envelope.

[0074] (21) The first ironing was carried out at a temperature of 100°C, a pressure of 60 bar and a rotation speed of 6.5 r / min.

[0075] (22) Roller wax: apply wax roller FI-677 on the leather blank. The amount of wax added is 100% of the weight of the leather blank. The application amount of roller coating is 6-8g per foot of leather blank.

[0076] (23) Display.

[0077] (24) The second ironing is performed at a temperature of 110°C, a pressure of 35 bar, and a rotation speed of 6.5 r / min. The leather blank is obtained after the second ironing.

[0078] (25) Spray bonding: spraying a mixed solution containing polyurethane emulsion, water, solvent and penetrant on the ironed leather blank at 125° C., wherein the spraying amount of the mixed solution is 2.1 g per foot of leather blank; the weight proportions of the polyurethane emulsion, water, solvent and penetrant in the mixed solution are 200 parts, 100 parts, 50 parts and 50 parts respectively.

[0079] (26) Display.

[0080] (27) The third ironing was carried out at a temperature of 110°C, a pressure of 35 bar and a rotation speed of 6.5 r / min.

[0081] (28) Surface paste treatment: a surface paste comprising color-changing wax FI-18-988, acrylic emulsion RA-2356, polyurethane adhesive resin RU-3989, water and dye is applied to the leather blank after the third ironing treatment. The coating amount of the surface paste is 1.1 g per foot of leather blank. The weight proportions of the color-changing wax, acrylic emulsion, polyurethane adhesive resin, water and dye in the surface paste are 50 parts, 80 parts, 50 parts, 150 parts and 80 parts respectively.

[0082] (29) Finished product surface treatment: applying a surface treatment solution containing polyurethane brightener (301A and H5), casein, water, a cross-linking agent and a hand-feeling agent to the leather blank after the paste treatment, wherein the coating amount of the surface treatment solution is 1.8-2.0 g per foot of leather blank; the weight proportions of polyurethane brightener 301A, polyurethane brightener H5, casein, water, cross-linking agent and hand-feeling agent in the surface treatment solution are 80 parts, 20 parts, 30 parts, 60 parts, 2 parts and 3 parts respectively.

[0083] (30) Display.

[0084] (31) Ironing, temperature 100 °C, pressure 15 bar, speed 6.5 r / min.

[0085] (32) Grade scale.

[0086] The texture of the cowhide oil wax sofa leather obtained in Example 1 is crocodile texture.

[0087] In addition, although exemplary embodiments have been described herein, the scope includes any and all embodiments based on the present application with equivalent elements, modifications, omissions, combinations (e.g., various embodiments intersecting schemes), adaptations or changes. The elements in the claims are to be interpreted broadly based on the language adopted in the claims, and are not limited to the examples described in this specification or during the practice of this application, and the examples are to be interpreted as non-exclusive. Therefore, this specification and examples are intended to be considered as examples only, and the true scope and spirit are indicated by the following claims and the full scope of their equivalents.

[0088] The above description is intended to be illustrative rather than restrictive. For example, the above examples (or one or more schemes thereof) may be used in combination with each other. For example, a person of ordinary skill in the art may use other embodiments when reading the above description. In addition, in the above-mentioned specific embodiments, various features may be grouped together to simplify the present application. This should not be interpreted as an intention that a feature of an application that does not require protection is necessary for any claim. On the contrary, the subject matter of the present application may be less than all the features of an embodiment of a particular application. Thus, the following claims are incorporated herein in the specific embodiments as examples or embodiments, wherein each claim is independently a separate embodiment, and it is considered that these embodiments may be combined with each other in various combinations or arrangements. The scope of the present invention should be determined with reference to the appended claims and the full scope of equivalent forms granted by these claims.

[0089] The above embodiments are only exemplary embodiments of the present application and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present application, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. A method for producing cowhide oil wax sofa leather, characterized in that: The production method comprises: blue leather is subjected to shaving, first rewetting, neutralization, filling, first fatting, drumming, squeezing and stretching, and vacuum drying in sequence to obtain a leather blank, and the leather blank is subjected to the processes of oscillation, grinding, resin rolling, oscillation, second rewetting, drum dyeing, second fatting, wet stretching, moisture regain and softening, stretching and wax rolling; the resin rolling process comprises: applying cracking resin to the leather blank twice in succession, the first application amount is 12-14g per foot of leather blank, and the second application amount is 6-8g per foot of leather blank; the leather blank after resin rolling is subjected to aging and drying treatment; the wax rolling comprises: applying wax to the leather blank by roller, the application amount is 6-8g per foot of leather blank; the leather blank after wax rolling is subjected to aging and drying treatment.

2. The production method according to claim 1, characterized in that The thickness of the blue leather after shaving is 1.1-1.15 mm.

3. The production method according to claim 1, characterized in that The first rewetting includes placing the shaved blue leather in a rewetting solution containing oxalic acid, L140 rewetting agent and water in a rotating drum at room temperature, rotating it, draining it and washing it with water, wherein the amount of oxalic acid added is 0.8-1.2% of the weight of the blue leather, the amount of L140 rewetting agent added is 0.4-0.6% of the weight of the blue leather, and the amount of water added is 190-210% of the weight of the blue leather; the rotation time is 20-40 minutes; and the pH of the rewetting solution is 3.5-3.

6.

4. The production method according to claim 1, characterized in that The neutralization comprises: adding sodium formate and phosphate multifunctional additives into a rotary drum, neutralizing the blue leather after the first rewetting treatment, and then draining, washing, and draining in sequence.

5. The production method according to claim 1, characterized in that: The filling comprises: in a rotating drum, mixing the neutralized blue leather with a mixed solution containing water, dispersant, melamine, synthetic oil, wattle tannin, chestnut tannin and phosphate multifunctional additives and rotating, and then draining, washing and draining in sequence; the water is added in an amount of 95-105% of the weight of the blue leather, the dispersant is added in an amount of 1.8-2.2% of the weight of the blue leather, the melamine is added in an amount of 2-4% of the weight of the blue leather, the synthetic oil is added in an amount of 0.8-1.2% of the weight of the blue leather, the wattle tannin is added in an amount of 12-14% of the weight of the blue leather, the chestnut tannin is added in an amount of 4-6% of the weight of the blue leather, and the phosphate multifunctional additive is added in an amount of 0.8-1.2% of the weight of the blue leather.

6. The production method according to claim 1, characterized in that: The first fattening comprises: in a rotating drum, mixing the filled blue leather with a mixed solution containing water, synthetic oil, sulfite fish oil and oxalic acid, wherein the amount of water added is 190-210% of the weight of the blue leather, the amount of synthetic oil added is 1-3% of the weight of the blue leather, the amount of sulfite fish oil added is 0.8-1.2% of the weight of the blue leather, and the amount of oxalic acid added is 0.8-1.2% of the weight of the blue leather.

7. The production method according to claim 1, characterized in that: The second fatliquoring comprises: in a rotary drum, sequentially mixing the leather blank after the back-drum dyeing treatment with a mixed solution containing water, fatty aldehyde, SQ-610, MK, DB, 30L and HCOOH, wherein the amount of water added is 190-210% of the weight of the leather blank, the amount of fatty aldehyde added is 0.8-1.2% of the weight of the leather blank, the amount of SQ-610 added is 4-6% of the weight of the leather blank, the amount of MK added is 4-6% of the weight of the leather blank, the amount of phospholipid added is 4-6% of the weight of the leather blank, the amount of mildew inhibitor added is 0.05-0.15% of the weight of the leather blank, and the amount of HCOOH added is 1.5-2.5% of the weight of the leather blank.

8. The production method according to claim 1, characterized in that: The production method also includes: the leather blank after rolling wax is sequentially aged and ironed for the second time to obtain the leather blank, and the leather blank is subjected to spray bonding, aging, third ironing and spraying with starch.

9. The production method according to claim 8, characterized in that: The spray bonding includes: spraying a mixed solution containing polyurethane emulsion, water, solvent and penetrant on the leather blank after the second ironing, and the spraying amount of the mixed solution is 2.0-2.2g per foot of the leather blank.

10. Cowhide oil wax sofa leather obtained by the production method according to any one of claims 1 to 9.

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