Preparation method of ecological leather based on all-natural materials

Abstract

The invention relates to a preparation method of high-comfort ecological leather based on all-natural materials. Comprising the following steps of batch grouping, pre-soaking, fleshing and trimming, main soaking, fleshing and trimming, enzyme unhairing, liming, splitting and trimming, deliming, softening, pickling, tanning in a tara tannin extract-tea polyphenol polymer (tea pigment)-zeolite combination, wringing, shaving and buffing, rewetting and filling, fat liquoring and finishing. By adding natural and modified fatliquoring agents such as the sulfated tea oil, the sulfated cattle hoof oil and the lecithin fatliquoring agent, as well as the natural dye and the filler, the leather can obtain good softness, full hand feeling and good comfort.

Description

[0001] A method for preparing highly comfortable eco-friendly leather based on all-natural materials Technical Field

[0002] This invention relates to the field of leather manufacturing technology, and in particular to a method for preparing highly comfortable eco-friendly leather based on all-natural materials. Background Technology

[0003] Leather is animal hide that has undergone physical and chemical processing such as hair removal and tanning, resulting in a modified, less perishable material. It is composed of naturally woven protein fibers in a three-dimensional space, with a special grain layer on its surface, giving it a natural grain and luster. It is comfortable to the touch and possesses high strength, good breathability, and abrasion resistance. It is widely used in clothing, footwear, bags, automotive interiors, furniture, and many other fields. Leather originates from natural animal hides, and its greatest characteristic is its ecological performance. It is user-friendly and possesses excellent sensory properties such as safety, skin-friendliness, and comfort.

[0004] Safety requirements dictate a safe leather-making process, avoiding the use of potentially harmful substances, and ensuring the resulting products are free of harmful substances. Skin-friendliness and comfort are reflected in consumer-friendliness, providing a better sensory experience. For leather products, comfort refers to the pleasantness of the subjective feelings and objective performance experienced during contact or use with the human body; its softness, fullness, elasticity, breathability, lightweight, and smoothness are all within their optimal range.

[0005] In view of this, there is an urgent need to develop an eco-friendly leather based on all-natural materials, which led to this case. Summary of the Invention

[0006] This invention provides a method for preparing highly comfortable eco-friendly leather based on all-natural materials, in order to solve the aforementioned problems of existing leathers.

[0007] The present invention adopts the following technical solution: A method for preparing high-comfort eco-leather based on all-natural materials includes the following steps: batching → pre-soaking → fleshing and trimming → main soaking → fleshing and trimming → enzymatic hair removal → liming → splitting and trimming → deliming → softening → acid soaking → tanning with tannin-tea polyphenol polymer (tea pigment)-zeolite combined tanning → squeezing, leveling, and sanding → rewetting and filling → fatliquoring → finishing; wherein, Batching: Using wet cowhide as raw material, select groups with basically the same weight, area and color as a group, weigh them, and add 130% to the weight for measurement (i.e. weigh 100g, and measure it as 100×130%=130g). Pre-soaking: Place the batched, salted, wet beef hide into a drum, add 200% water at 19-21℃, 0.2-0.3% tea saponin cleaning agent, 0.2-0.3% ProSpread penetrant (Proviera, USA), 0.1-0.2% degreasing agent (ProDegreaze, Proviera, USA), and 0.3-0.5% wood ash. Rotate for 10 minutes, then stop for 30 minutes; maintain a rotation speed of 2-3 rpm; control the temperature at 19-21℃, pH at 6.3-6.7, and Baume degree at 8-9; repeat 4-6 times; wash with water, remove from the drum; then remove the hide and trim the edges. Main soaking: Place the pre-soaked, de-fleshed, and trimmed cowhide into a drum, add 200% water at 18-22℃, and rotate the drum at 3 rpm; add 0.2-0.3% tea saponin cleaning agent, 0.2-0.3% ProSpread (Proviera, USA) penetrant, 0.2-0.3% ProSoak (Proviera, USA) soaking agent, and 0.2-0.3% ProDegreaze degreasing agent, rotate for 10 minutes, stop for 20 minutes; control the pH to 6.3-6.7, rotate the drum at 2-3 rpm, and repeat 1-3 times; add 0.2-0.4% wood ash and 0.1-0.3% green tea bactericide, adjust the pH to 9.5-10.5, rotate for 10 minutes, stop for 20 minutes; repeat 5-8 times, requiring complete penetration and a milky white cut surface; wash with water and remove from the drum; Enzymatic hair removal: The soaked cowhide, after primary soaking, fleshing, and trimming, is placed in a rotating drum. 100% 24-28℃ solution is added, and the drum speed is 6-8 rpm. The pH is adjusted to 9.0-9.5. 0.3% ProSpread penetrant, 1.0-1.5% nano-negative ion powder (Lingshou County Baifei Mineral Products Processing Plant), and 0.7-1.3% compound enzyme A are added, and the drum is rotated for 30 minutes. 0.3-0.5% keratinase K is added, and the drum is rotated for another 30 minutes. The hair removal rate is checked. If the hair removal rate is greater than 90%, proceed to the next step; otherwise, continue rotating for 30-60 minutes. The cowhide is then washed, filtered, and drained. Lime impregnation: Place bovine delimed hides with a hair removal rate >90% into a drum, add 100% water at 24-26℃, and rotate the drum at 3-5 rpm; add 0.3% ProSpread penetrant and 2% lime, and rotate for 60 min; add 100% water at 24-26℃, 50% of a 20% wood ash solution, and 0.15-0.2% of a 30% sodium hydroxide solution, and rotate for 60 min; then rotate for 5 min, stop for 55 min, and repeat 5-8 times; wash with water and remove from the drum; Deliming: Place the dehaired and split bovine hide into a drum, add 50-100% water at 30-35℃, add 0.3% ProSpread penetrant, add 0.7-1.0% BITOR DF (Unitek, Italy) deliming agent (ammonia-free organic acid), and rotate for 15-30 minutes at 6 rpm; then add 0.7-1.5% BITOR DF (Unitek, Italy) deliming agent (ammonia-free organic acid), and rotate for 15-30 minutes; adjust the pH to 8.0-8.5. Softening: Continue adding 0.2-0.5% of ammonium-free softening enzyme CBK (Sichuan Dawei Chemical) and 0.3% of degreasing agent ProDegreaze, incubate for 10 minutes, then stop for 20 minutes; adjust the temperature to 30-32℃ and pH to 7.5-8.5, incubate for 10 minutes, then stop for 20 minutes; repeat 2-3 times. When the buttock incision shows no color change in phenolphthalein reagent, softening is considered complete; wash with water and remove from the drum; Acid soaking: Place the softened raw cow hide into a rotating drum, add 50-150% water at 23-25℃, add 7-10% sodium chloride, and rotate for 10 minutes at 8 rpm; adjust the Baumé degree to ≥7; while rotating, add 0.5-1.5% formic acid diluted with 8-10 times room temperature water, and rotate for 30 minutes; add 0.2-0.8% concentrated sulfuric acid diluted with 8-10 times room temperature water, adjust the pH to 2.5-3.0, and rotate for 60-180 minutes; control the liquid to 50%; then add 10% of a 20% wood ash solution in portions, and rotate for 30 minutes; adjust the pH to 5.5-6.0; add 4-6% sodium sulfate, and rotate for 60 minutes; Tannin-tea polyphenol-zeolite combined tanning: This process is carried out in the same solution as the pickling solution. Add 5-15% tannin (TRUPOTAN TR, TRUMPLER, Germany) and 10-30% tea polyphenols, and rotate for 300-600 minutes. After complete penetration, add 50% water at 40-50℃ and rotate for 60 minutes. Then, add 0.1% formic acid in portions and rotate for 30 minutes each time. Adjust the pH to 3.0-3.5 and rotate for 30 minutes. Add 2-4% zeolite tanning agent (BITAN BS, Unitek, Italy) and rotate for 30-60 minutes. Add 6-8% zeolite tanning agent (BITAN CF, Unitek, Italy) and rotate for 30-60 minutes. Add wood ash to adjust the pH to 5.4-5.6 and rotate for 60-120 minutes. Drain the solution and remove from the drum. Buffing: After squeezing out water and shaving evenly (to a thickness of 1.10-1.15mm), the wet white leather is laid flat and buffed with sandpaper from a buffing machine to make its grain surface regular and uniform. Filling: Place the wet white leather, after squeezing out water, shaving, and sanding, into a drum, add 80-100% water and 1% sodium formate, and rotate for 15 minutes; add 10% of a 20% wood ash solution to adjust the pH to 5.5-6.5, add 3-5% protein filler BITAN F (Unitek, Italy) and 3-5% natural dye, and rotate for 60-120 minutes; adjust the pH to 4.3-4.8 with formic acid, and rotate for 15 minutes; wash with water; drain. Fat addition: Add 100-150% water at 45-55℃, 9-18% sulfated tea oil, 2% sulfated cow hoof oil BITIOL CK (Unitek, Italy), 2% lecithin fatliquoring agent BITIOL LC (Unitek, Italy), and 4% natural compound fatliquoring agent BITIOL CO (Unitek, Italy). Incubate for 90 minutes, then adjust the pH to 3.6-3.8 with formic acid, incubate for 30 minutes, wash with 300% water, and remove from drum.

[0008] Furthermore, the finishing process is as follows: dehydration and stretching → vacuum drying → hanging and drying → rehydration → softening by tumbling → stretching and drying → sealing the base → calendering → top coating (surface treatment) → softening → tumbling → measuring and warehousing; wherein, Dewatering and stretching: carried out on a reciprocating dewatering and stretching machine with a blade spacing of 1.10-1.15 mm, a dewatering pressure of 30 bar, and a feed speed of 20-25 m / min; the moisture content after dewatering is controlled at 50-55%.

[0009] Vacuum drying: carried out on a vacuum dryer at a temperature of 45℃ for 500 seconds and a negative pressure of 23-26 Mbar; the moisture content after vacuum drying is controlled at 23-30%.

[0010] Hanging and drying: carried out on a hanging drying line, with a hanging time of 24 hours. After hanging and drying, the moisture content is controlled at 13-18%.

[0011] Drying: The drying process is carried out in a constant temperature and humidity drying oven. The temperatures of the three ovens are 37℃, 42℃ and 48℃ respectively; the humidity is 30-35%; the time is 12 hours; and the moisture content after drying is controlled at 6-10%.

[0012] Rehumidification: Performed on a rehumidification machine. After rehumidification, the moisture content is controlled at 20-25%.

[0013] Tumbling and softening: This is carried out in a stainless steel octagonal tumbling and softening drum. The drum speed is 15 r / min, the time is 6 h, the drum rotates in both directions, and the temperature inside the drum is automatically controlled at 25-30℃; after tumbling and softening, the moisture content of the raw leather is 18-20%.

[0014] Stretching: Performed on a horizontal stretching machine. Oven temperature 50 ℃, stretching distance 6 cm, clamping distance 10~12 cm, raw leather time in oven 20 min, raw leather moisture content 14%~18%.

[0015] Base coat: Apply using a spray gun, with a coating amount of approximately 5-10 g / sf, spraying 1-3 times, each time 3-5 g / sf2, for a total coating amount of approximately 3-15 g / sf2. The coating agent formulation is as follows: 500-1000 parts water, 500-800 parts water-soluble protein binder BI-596 (Stahl GmbH, Germany), 200-300 parts modified protein Melio Top 286, modified protein gloss agent Melio Top 239 (HM-443, Stahl GmbH, Germany), 20-100 parts penetrant ProSpread, and 50-100 parts bio-based additive puRE130 (Qingdao Baicaobian Biotechnology Co., Ltd.). Calendering: Performed on a board iron with a board surface temperature of 100℃, a pressure of 30kg, and a time of 2s.

[0016] Top Coating: Operate on a computer-controlled sprayer, spraying 1-3 times, each time 2-3 g / sf2, with a coating amount of approximately 3-5 g / sf2; the coating agent formula is as follows: 100-800 parts water, 10-20 parts graphene-modified organosilicon feel agent, 10-20 parts graphene oxide dispersion (Shanghai Macklin Reagent); 20-40 parts γ-aminopropyltriethoxysilane (97%, Shanghai Macklin Reagent), 50-100 parts (prepared and used immediately); 200-400 parts modified protein brightener Melio Top 239 (HM-443, Stahl GmbH, Germany); 20-100 parts penetrant ProSpread; 50-100 parts bio-based additive puRE130 (Qingdao Baicaobian Biotechnology Co., Ltd.); Oscillating softening: Operated on an oscillating softening machine. The parameters of the oscillating softening machine are: conveying speed 9.5 m / min, number of stages 5.

[0017] Blazing: Operated on a pass-through ironing machine, with a temperature of 120 ℃, a pressure of 20-30 kg, and a speed of 8 m / min.

[0018] Further, the preparation of the above-mentioned tea saponin cleaning agent is as follows: 1 kg of pulverized tea cake powder is added to a subcritical treatment device, 10-15 kg of 70-90% ethanol aqueous solution is added, the device is sealed, and the reaction is carried out at a temperature of 105-150℃ and a pressure of 0.5-1.5MPa for 0.5-3 hours. The mixture is filtered, and the filtrate is cooled to room temperature. 0.5-10% NaCl is added, and the mixture is centrifuged. The lower layer is evaporated to dryness to obtain tea saponin. Then, tea saponin is mixed with wood ash and acetic acid (Shandong Yicheng Biotechnology Co., Ltd.) to obtain the tea saponin cleaning agent.

[0019] Furthermore, the preparation of the above-mentioned wood ash involves: burning waste wood and residues from natural plant materials produced by this patented technology, collecting the ash, and crushing it. The wood ash is then poured into water, stirred, and impurities are filtered out to obtain a wood ash solution.

[0020] Further, the preparation of the above-mentioned green tea bactericide is as follows: 1 kg of pulverized non-grade green tea powder is added to a subcritical treatment device, 10-30 kg of 75-99% ethanol aqueous solution is added, the device is sealed, and the reaction is carried out at a temperature of 60-80℃ for 0.5-5 hours. The mixture is then filtered, and the filtrate is cooled to room temperature. The ethanol is removed, and the mixture is concentrated and freeze-dried to obtain the green tea bactericide.

[0021] Further, the above-mentioned tea polyphenol polymer (tea pigment) is prepared as follows: 1 kg of pulverized non-grade green tea powder is added to a subcritical treatment device, 15-45 kg of distilled water is added, the device is sealed, and the reaction is carried out at a temperature of 120-180℃ and a pressure of 0.5-1.5 MPa for 0.5-3 h. The mixture is then filtered, and the filtrate is cooled to room temperature. After freeze-drying, the tea polyphenol polymer (tea pigment) is obtained.

[0022] Further, the above-mentioned sulfated tea oil preparation is as follows: 1 kg of crushed tea cake powder is added to a subcritical treatment device, 10-15 kg of 70-90% ethanol aqueous solution is added, the device is sealed, and the reaction is carried out at a temperature of 105-150℃ and a pressure of 0.5-1.5MPa for 0.5-3 hours. The mixture is filtered, and the filtrate is cooled to room temperature. 0.5-10% NaCl is added, and the mixture is centrifuged. The upper layer is evaporated to dryness to obtain tea oil, which is then subjected to conventional sulfation treatment to obtain tea oil fatliquoring agent.

[0023] As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following advantages: 1. Throughout the leather-making process, self-made natural materials are widely used. For example, tea saponin detergent and wood ash are used in the pre-soaking stage, green tea bactericide is added in the main soaking stage, and sulfated tea oil is used in the fatliquoring stage. Compared with traditional chemical agents, these natural materials cause less pollution to the environment, reducing the emission of harmful chemicals and lowering the potential harm to human health and the ecological environment during production and use.

[0024] 2. Traditional leather production processes use a large amount of chemical agents containing harmful substances such as heavy metals and formaldehyde. This solution uses natural materials to replace some of the chemical agents, reducing chemical pollution at the source. This aligns with the current green and environmentally friendly development concept and is conducive to the sustainable development of the leather industry.

[0025] 3. The innovative tanning process employs a combination of tannin-tea polyphenols-zeolite, allowing the tanning agents to better integrate with leather fibers. This improves the leather's shrinkage temperature and resistance to damp heat, enhancing its strength and abrasion resistance. Simultaneously, tea polyphenols possess antioxidant and antibacterial properties, further improving the leather's aging resistance and antibacterial performance, thus extending its lifespan.

[0026] 4. During the fatliquoring and filling stages, the addition of natural and modified fatliquoring agents such as sulfated tea oil, sulfated cow hoof oil, and lecithin fatliquoring agents, as well as natural dyes and fillers, enables the leather to achieve good softness and a full hand feel. These fatliquoring agents and fillers can be evenly distributed between the leather fibers, increasing the leather's elasticity and toughness, making the leather more comfortable and durable. Detailed Implementation

[0027] Example 1: A method for preparing high-comfort eco-leather based on all-natural materials includes the following steps: batching → pre-soaking → fleshing and trimming → main soaking → fleshing and trimming → enzymatic hair removal → liming → splitting and trimming → deliming → softening → acid soaking → tanning with tannin-tea polyphenol polymer (tea pigment)-zeolite combined tanning → squeezing, leveling, and sanding → rewetting and filling → fatliquoring → finishing; wherein, Batching: Using wet cowhide as raw material, select groups with basically the same weight, area and color as a group, weigh them, and add 130% to the weight for measurement (i.e. weigh 100g, and measure it as 100×130%=130g). Pre-soaking: Place the batched salted beef hides into the drum, add 200% water at 19℃, 0.2% tea saponin cleaning agent, 0.2% ProSpread penetrant (Proviera, USA), 0.1% degreasing agent (ProDegreaze, Proviera, USA), and 0.3% wood ash. Rotate for 10 minutes, stop for 30 minutes; speed 2 rpm; control temperature 19-21℃, pH 6.3-6.7, Baume degree 8-9; repeat 4 times; wash with water, remove from the drum; remove the hides and trim the edges. Main soaking: Place the pre-soaked, de-fleshed, and trimmed cowhide into a drum, add 200% water at 18℃, and rotate the drum at 3 rpm; add 0.2% tea saponin cleaning agent, 0.2% penetrant ProSpread (Proviera, USA), 0.2% soaking agent ProSoak (Proviera, USA), and 0.2% degreasing agent ProDegreaze, rotate for 10 minutes, stop for 20 minutes; control the pH at 6.3-6.7, rotate at 2 rpm, and repeat 3 times; add 0.2% wood ash and 0.1% green tea bactericide, adjust the pH to 9.5-10.5, rotate for 10 minutes, stop for 20 minutes; repeat 5 times, requiring complete penetration and a milky white cut surface; wash with water and remove from the drum; Enzymatic hair removal: The soaked cowhide, after primary soaking, fleshing, and trimming, is placed into a rotating drum. 100% 24℃ solution is added, and the drum speed is 6 rpm. The pH is adjusted to 9.0-9.5. 0.3% ProSpread penetrant, 1.0% nano-negative ion powder (Lingshou County Baifei Mineral Products Processing Plant), and 0.7% compound enzyme A are added, and the drum is rotated for 30 minutes. 0.3% keratinase K is added, and the drum is rotated for another 30 minutes. The hair removal rate is checked. If the hair removal rate is greater than 90%, proceed to the next step; otherwise, continue rotating for 30 minutes. The hide is then washed with water, the hair is filtered, and the liquid is drained. Lime impregnation: Place bovine de-limed hides with a hair removal rate >90% into a drum, add 100% water at 24℃, and rotate the drum at 3 rpm; add 0.3% ProSpread penetrant and 2% lime, and rotate for 60 min; add 100% water at 24℃, 50% of a 20% wood ash solution, and 0.15% of a 30% sodium hydroxide solution, and rotate for 60 min; then rotate for 5 min, stop for 55 min, and repeat 5 times; wash with water and remove from the drum; Deliming: Place the dehaired and split bovine hide into a drum, add 50% water at 30°C, add 0.3% ProSpread penetrant, add 0.7% BITOR DF (Unitek, Italy) deliming agent (ammonia-free organic acid), and rotate for 15 minutes at 6 rpm; then add another 0.7% BITOR DF (Unitek, Italy) deliming agent (ammonia-free organic acid), and rotate for 15 minutes; adjust the pH to 8.0-8.5; Softening: Continue adding 0.2% ammonium-free softening enzyme CBK (Sichuan Dawei Chemical) and 0.3% degreasing agent ProDegreaze, incubate for 10 minutes, then stop for 20 minutes; adjust the temperature to 30℃ and pH to 7.5-8.5, incubate for 10 minutes, then stop for 20 minutes; repeat twice. When the buttock incision shows no color change in phenolphthalein reagent, softening is considered complete; wash with water and remove from the drum; Acid soaking: Softened raw cowhide is placed into a rotary drum, 50% water at 23°C is added, 7% sodium chloride is added, and the drum is rotated for 10 minutes at 8 rpm; the Baumé degree is adjusted to ≥7; while rotating, 0.5% formic acid (diluted with 8 times the amount of room temperature water) is added, and the drum is rotated for 30 minutes; 0.2% concentrated sulfuric acid (diluted with 8 times the amount of room temperature water) is added, and the pH is adjusted to 2.5-3.0, and the drum is rotated for 60 minutes; the liquid is then controlled to 50%; then 10% of a 20% wood ash solution is added in portions, and the drum is rotated for 30 minutes; the pH is adjusted to 5.5-6.0; 4% sodium sulfate is added, and the drum is rotated for 60 minutes. Tannin-tea polyphenol-zeolite combined tanning: The process is carried out in the same solution as the pickling solution. Add 5% tannin TRUPOTAN TR (TRUMPLER, Germany) and 10% tea polyphenols, and rotate for 300 min. After complete penetration, add 50% water at 40℃ and rotate for 60 min. Then, add 0.1% formic acid in portions and rotate for 30 min each time. Adjust the pH to 3.0-3.5 and rotate for 30 min. Add 2% zeolite tanning agent BITAN BS (Unitek, Italy) and rotate for 30 min. Add 6% zeolite tanning agent BITAN CF (Unitek, Italy) and rotate for 30 min. Add wood ash to adjust the pH to 5.4-5.6, rotate for 60 min, drain the solution, and remove from the drum. Buffing: After squeezing out water and shaving evenly (to a thickness of 1.10mm), the wet white leather is laid flat and buffed with sandpaper from a buffing machine to make its grain surface regular and uniform. Filling: Place the wet white leather, after squeezing out water, shaving, and sanding, into a rotating drum. Add 80-100% water and 1% sodium formate, and rotate for 15 minutes. Add 10% of a 20% wood ash solution to adjust the pH to 5.5-6.5. Add 3% protein filler BITAN F (Unitek, Italy) and 3% natural dye, and rotate for 60 minutes. Adjust the pH to 4.3-4.8 with formic acid and rotate for 15 minutes. Wash with water and drain. Fat addition: Add 100% water at 45℃, 9% sulfated tea oil, 2% sulfated cow hoof oil BITIOL CK (Unitek, Italy), 2% lecithin fatliquoring agent BITIOL LC (Unitek, Italy), and 4% natural compound fatliquoring agent BITIOLCO (Unitek, Italy). Incubate for 90 minutes, then adjust the pH to 3.6-3.8 with formic acid, incubate for 30 minutes, wash with 300% water, and remove from drum.

[0028] Furthermore, the above finishing process is as follows: dewatering and stretching → vacuum drying → hanging and drying → rehumidification → softening by tumbling → stretching and drying → sealing the base → troweling → top coating (surface treatment) → softening → rolling → measuring and warehousing; among which, Dewatering and stretching: carried out on a reciprocating dewatering and stretching machine with a blade spacing of 1.10 mm, a dewatering pressure of 30 bar, and a feed speed of 20 m / min; the moisture content after dewatering is controlled at 50%.

[0029] Vacuum drying: carried out on a vacuum dryer at a temperature of 45°C for 500 seconds and a negative pressure of 23 Mbar; the moisture content after vacuum drying is controlled at 23%.

[0030] Hanging and drying: carried out on a hanging drying line, with a hanging time of 24 hours, and the moisture content after hanging and drying is controlled at 13%.

[0031] Drying: The drying process was carried out in a constant temperature and humidity drying oven. The temperatures of the three ovens were 37℃, 42℃ and 48℃, respectively; the humidity was 30% and the time was 12 hours. The moisture content after drying was controlled at 6%.

[0032] Re-humidification: Performed on a re-humidification machine. After re-humidification, the moisture content is controlled at 20%.

[0033] Tumbling and softening: This process is carried out in a stainless steel octagonal tumbling and softening drum. The drum speed is 15 r / min, the time is 6 h, the drum rotates in both directions, and the internal temperature of the drum is automatically controlled at 25℃; after tumbling and softening, the moisture content of the raw leather is 18%.

[0034] Stretching: Performed on a horizontal stretching machine, oven temperature 50 ℃, stretching distance 6 cm, clamping distance 10 cm, raw leather time in oven 20 min, raw leather moisture content 14%.

[0035] Base coat: Apply using a spray gun, with a coating amount of approximately 5-10 g / sf, spraying 3 times, each time 3 g / sf2, for a total coating amount of approximately 3 g / sf2; the coating agent formula is as follows: 500 parts water, 500-800 parts water-soluble protein binder BI-596 (Stahl GmbH, Germany); 200 parts modified protein Melio Top 286, 200 parts modified protein gloss agent Melio Top 239 (HM-443, Stahl GmbH, Germany); 80 parts penetrant ProSpread; 50 parts bio-based additive puRE130 (Qingdao Baicaobian Biotechnology Co., Ltd.); Calendering: Performed on a board iron with a board surface temperature of 100℃, a pressure of 30kg, and a time of 2s.

[0036] Top Coating: Operate on a computer-controlled sprayer, spraying 3 times, 3 g / sf2 each time, with a coating amount of approximately 5 g / sf2; the coating agent formula is as follows: 400 parts water, 10 parts graphene-modified organosilicon feel agent, 10 parts graphene oxide dispersion (Shanghai Macklin Reagent); 20 parts γ-aminopropyltriethoxysilane (97%, Shanghai Macklin Reagent, freshly prepared) 50 parts; modified protein brightener Melio Top 239 (HM-443, Stahl GmbH, Germany) 200 parts; penetrant ProSpread 50 parts; bio-based additive puRE130 (Qingdao Baicaobian Biotechnology Co., Ltd.); Oscillating softening: Operated on an oscillating softening machine with the following parameters: conveying speed 9.5 m / min, 5 stages.

[0037] Blazing: Operated on a pass-through ironing machine at a temperature of 120 ℃, a pressure of 20 kg, and a speed of 8 m / min.

[0038] Preparation of the above-mentioned tea saponin cleaning agent: 1 kg of crushed tea cake powder was added to a subcritical treatment device, 10 kg of 70% ethanol aqueous solution was added, the device was sealed, and the reaction was carried out at a temperature of 105℃ and a pressure of 0.5 MPa for 0.5 h. The mixture was filtered, and the filtrate was cooled to room temperature. 0.5% NaCl was added, and the mixture was centrifuged. The lower layer was evaporated to dryness to obtain tea saponin. Then, tea saponin was mixed with wood ash and acetic acid (Shandong Yicheng Biotechnology Co., Ltd.) to obtain the tea saponin cleaning agent.

[0039] Preparation of the above-mentioned plant ash: Burn waste wood and residues from natural plant materials produced by this patented technology, collect the combustion ash, crush it, pour the plant ash into water, stir, filter out impurities, and that is the plant ash solution.

[0040] Preparation of the above-mentioned green tea bactericide: 1 kg of crushed non-grade green tea powder was added to a subcritical treatment device, 10 kg of 75% ethanol aqueous solution was added, the device was sealed, and the reaction was carried out at 60℃ for 0.5 h. The mixture was filtered, and the filtrate was cooled to room temperature. The ethanol was removed, and the mixture was concentrated and freeze-dried to obtain the green tea bactericide.

[0041] Preparation of the above-mentioned tea polyphenol polymer (tea pigment): 1 kg of pulverized non-grade green tea powder was added to a subcritical treatment device, 15 kg of distilled water was added, the device was sealed, and the reaction was carried out at a temperature of 120℃ and a pressure of 0.5 MPa for 0.5 h. The mixture was filtered, and the filtrate was cooled to room temperature. After freeze-drying, the tea polyphenol polymer (tea pigment) was obtained.

[0042] The above-mentioned preparation of sulfated tea oil: 1 kg of crushed tea cake powder was added to a subcritical treatment device, 10 kg of 70% ethanol aqueous solution was added, the device was sealed, and the reaction was carried out at a temperature of 105℃ and a pressure of 0.5 MPa for 0.5 h. The mixture was filtered, and the filtrate was cooled to room temperature. 0.5% NaCl was added, and the mixture was centrifuged. The upper layer was evaporated to dryness to obtain tea oil, which was then subjected to conventional sulfation treatment to obtain tea oil fatliquoring agent.

[0043] Example 2: A method for preparing high-comfort eco-leather based on all-natural materials includes the following steps: batching → pre-soaking → fleshing and trimming → main soaking → fleshing and trimming → enzymatic hair removal → liming → splitting and trimming → deliming → softening → acid soaking → tanning with tannin-tea polyphenol polymer (tea pigment)-zeolite combined tanning → squeezing, leveling, and sanding → rewetting and filling → fatliquoring → finishing; wherein, Batching: Using wet cowhide as raw material, select groups with basically the same weight, area and color as a group, weigh them, and add 130% to the weight for measurement (i.e. weigh 100g, and measure it as 100×130%=130g). Pre-soaking: Place the batched salted beef hides into the drum, add 200% water at 21°C, 0.3% tea saponin cleaning agent, 0.3% ProSpread penetrant (Proviera, USA), 0.2% degreasing agent (ProDegreaze, Proviera, USA), and 0.5% wood ash. Rotate for 10 minutes, stop for 30 minutes; speed 3 rpm; control temperature at 21°C, pH 6.3-6.7, Baume degree 8-9; repeat 6 times; wash with water, remove from the drum; remove the hides and trim the edges. Main soaking: Place the pre-soaked, de-fleshed, and trimmed cowhide into a drum, add 200% water at 22℃, and rotate the drum at 3 rpm; add 0.3% tea saponin cleaning agent, 0.3% ProSpread (Proviera, USA) penetrant, 0.3% ProSoak (Proviera, USA) soaking agent, and 0.3% ProDegreaze degreasing agent, rotate for 10 minutes, stop for 20 minutes; control the pH at 6.3-6.7, rotate at 3 rpm, and repeat 3 times; add 0.4% wood ash and 0.1-0.3% green tea bactericide, adjust the pH to 9.5-10.5, rotate for 10 minutes, stop for 20 minutes; repeat 5-8 times, requiring complete penetration and a milky white cut surface; wash with water and remove from the drum; Enzymatic hair removal: The soaked cowhide, after soaking, fleshing, and trimming, is placed into a rotating drum. 100% 28℃ solution is added, and the drum speed is 8 rpm. The pH is adjusted to 9.0-9.5. 0.3% ProSpread penetrant, 1.5% nano-negative ion powder (Lingshou County Baifei Mineral Products Processing Plant), and 1.3% compound enzyme A are added, and the drum is rotated for 30 minutes. 0.5% keratinase K is added, and the drum is rotated for another 30 minutes. The hair removal rate is checked. If the hair removal rate is greater than 90%, proceed to the next step; otherwise, continue rotating for 60 minutes. The hide is then washed, filtered, and drained. Lime impregnation: Place bovine delimed hides with a hair removal rate >90% into a drum, add 100% water at 26℃, and rotate the drum at 5 rpm; add 0.3% ProSpread penetrant and 2% lime, and rotate for 60 min; add 100% water at 26℃, 50% of a 20% wood ash solution, and 0.2% of a 30% sodium hydroxide solution, and rotate for 60 min; then rotate for 5 min, stop for 55 min, and repeat 8 times; wash with water and remove from the drum; Deashing: Place the dehaired and split bovine hide into a drum, add 100% water at 35°C, add 0.3% ProSpread penetrant, add 1.0% BITOR DF (Unitek, Italy) deashing agent (ammonia-free organic acid), and rotate for 30 minutes at 6 rpm; then add 1.5% BITOR DF (Unitek, Italy) deashing agent (ammonia-free organic acid), and rotate for 30 minutes; adjust the pH to 8.0-8.5; Softening: Continue adding 0.5% of ammonium-free softening enzyme CBK (Sichuan Dawei Chemical) and 0.3% of degreasing agent ProDegreaze, incubate for 10 minutes, then stop for 20 minutes; adjust the temperature to 32℃ and pH to 7.5-8.5, incubate for 10 minutes, then stop for 20 minutes; repeat 3 times. When the buttock incision shows no color change in phenolphthalein reagent, softening is considered complete; wash with water and remove from the drum; Acid soaking: Place the softened raw cow hide into a rotary drum, add 150% water at 25℃ and 10% sodium chloride, and rotate for 10 minutes at 8 rpm; adjust the Baumé degree to ≥7; while rotating, add 1.5% formic acid diluted 10 times with room temperature water (85% concentration), and rotate for 30 minutes; add 0.8% concentrated sulfuric acid diluted 10 times with room temperature water (98% concentration), adjust the pH to 2.5-3.0, and rotate for 60-180 minutes; control the liquid volume to 50%; then add 10% 20% wood ash solution in portions, and rotate for 30 minutes; adjust the pH to 5.5-6.0; add 6% sodium sulfate, and rotate for 60 minutes; Tannin-tea polyphenol-zeolite combined tanning: The process is carried out in the same solution as the pickling solution. Add 15% tannin TRUPOTAN TR (TRUMPLER, Germany) and 30% tea polyphenols, and rotate for 600 min. After complete penetration, add 50% water at 50℃ and rotate for 60 min. Then add 0.1% formic acid in portions and rotate for 30 min each time. Adjust the pH to 3.5 and rotate for 30 min. Add 4% zeolite tanning agent BITAN BS (Unitek, Italy) and rotate for 60 min. Add 8% zeolite tanning agent BITAN CF (Unitek, Italy) and rotate for 60 min. Add wood ash to adjust the pH to 5.4-5.6, rotate for 120 min, drain the solution, and remove from the drum. Buffing: After squeezing out water and shaving evenly (to a thickness of 1.15mm), the wet white leather is laid flat and buffed with sandpaper from a buffing machine to make its grain surface regular and uniform. Filling: Place the wet white leather, after squeezing out water, shaving, and sanding, into a drum, add 100% water and 1% sodium formate, and rotate for 15 minutes; add 10% 20% wood ash solution to adjust the pH to 5.5-6.5, add 5% protein filler BITAN F (Unitek, Italy) and 5% natural dye, and rotate for 120 minutes; adjust the pH to 4.3-4.8 with formic acid, and rotate for 15 minutes; wash with water; drain. Fat addition: Add 150% water at 55℃, 18% sulfated tea oil, 2% sulfated cow hoof oil BITIOL CK (Unitek, Italy), 2% lecithin fatliquoring agent BITIOL LC (Unitek, Italy), and 3-4% natural compound fatliquoring agent BITIOLCO (Unitek, Italy). Incubate for 90 minutes, then adjust the pH to 3.6-3.8 with formic acid, incubate for 30 minutes, wash with 300% water, and remove from drum.

[0044] The above finishing process is as follows: water squeezing and stretching → vacuum drying → hanging and drying → rehydration → softening by tumbling → stretching and drying → sealing the base → troweling → top coating (surface treatment) → softening → rolling → measuring and warehousing; among which, Dewatering and stretching: carried out on a reciprocating dewatering and stretching machine with a blade spacing of 1.15 mm, a dewatering pressure of 30 bar, and a feed speed of 25 m / min; the moisture content after dewatering is controlled at 55%.

[0045] Vacuum drying: carried out on a vacuum dryer at a temperature of 45°C for 500 seconds and a negative pressure of 26 Mbar; the moisture content after vacuum drying is controlled at 30%.

[0046] Hanging and drying: carried out on a hanging drying line, with a hanging time of 24 hours, and the moisture content after hanging and drying is controlled at 18%.

[0047] Drying: The drying process was carried out in a constant temperature and humidity drying oven. The temperatures of the three ovens were 37℃, 42℃ and 48℃, respectively; the humidity was 35% and the time was 12 hours. The moisture content after drying was controlled at 10%.

[0048] Re-humidification: Performed on a re-humidification machine. After re-humidification, the moisture content is controlled at 25%.

[0049] Tumbling and softening: This is carried out in a stainless steel octagonal tumbling and softening drum. The drum speed is 15 r / min, the time is 6 h, the drum rotates in both directions, and the internal temperature of the drum is automatically controlled at 30℃; after tumbling and softening, the moisture content of the raw leather is 20%.

[0050] Stretching: Performed on a horizontal stretching machine. Oven temperature 50 ℃, stretching distance 6 cm, clamping distance 12 cm, raw leather time in oven 20 min, raw leather moisture content 18%.

[0051] Base coat: Apply using a spray gun, with a coating amount of approximately 10g / sf, spraying 3 times, each time 5g / sf2, for a total coating amount of approximately 15g / sf2; the coating agent formula is as follows: 1000 parts water, 800 parts water-soluble protein binder BI-596 (Stahl GmbH, Germany); 300 parts modified protein Melio Top 286, 300 parts modified protein gloss agent Melio Top 239 (HM-443, Stahl GmbH, Germany); 100 parts penetrant ProSpread; 100 parts bio-based additive puRE130 (Qingdao Baicaobian Biotechnology Co., Ltd.); Calendering: Performed on a board iron with a board surface temperature of 100℃, a pressure of 30kg, and a time of 2s.

[0052] Top Coating: Operate on a computer-controlled sprayer, spraying 3 times, 3 g / sf2 each time, with a coating amount of approximately 5 g / sf2; the coating agent formula is as follows: 800 parts water, 20 parts graphene-modified organosilicon feel agent, 20 parts graphene oxide dispersion (Shanghai Maclean Reagent); 20-40 parts γ-aminopropyltriethoxysilane (97%, Shanghai Maclean Reagent), 100 parts (prepared and used immediately); 400 parts modified protein brightener Melio Top 239 (HM-443, Stahl GmbH, Germany); 100 parts penetrant ProSpread; 100 parts bio-based additive puRE130 (Qingdao Baicaobian Biotechnology Co., Ltd.); Oscillating softening: Operated on an oscillating softening machine with the following parameters: conveying speed 9.5 m / min, 5 stages.

[0053] Blazing: Operated on a pass-through ironing machine at a temperature of 120 ℃, a pressure of 0 kg, and a speed of 8 m / min.

[0054] Preparation of the above-mentioned tea saponin cleaning agent: 1 kg of crushed tea cake powder was added to a subcritical treatment device, 15 kg of 90% ethanol aqueous solution was added, the device was sealed, and the reaction was carried out at a temperature of 150℃ and a pressure of 1.5 MPa for 3 h. The mixture was filtered, and the filtrate was cooled to room temperature. 10% NaCl was added, and the mixture was centrifuged. The lower layer was evaporated to dryness to obtain tea saponin. Then, tea saponin was mixed with wood ash and acetic acid (Shandong Yicheng Biotechnology Co., Ltd.) to obtain the tea saponin cleaning agent.

[0055] Preparation of the above-mentioned wood ash: Waste wood and residues from natural plant materials produced by this patented technology are burned, the ash is collected and crushed. The wood ash is poured into water, stirred, and impurities are filtered out to obtain a wood ash solution.

[0056] Preparation of the above-mentioned green tea bactericide: 1 kg of crushed non-grade green tea powder was added to a subcritical treatment device, 30 kg of 99% ethanol aqueous solution was added, the device was sealed, and the reaction was carried out at 80℃ for 5 h. The mixture was filtered, and the filtrate was cooled to room temperature. The ethanol was removed, and the mixture was concentrated and freeze-dried to obtain the green tea bactericide.

[0057] Preparation of the above-mentioned tea polyphenol polymer (tea pigment): 1 kg of pulverized non-grade green tea powder was added to a subcritical treatment device, 45 kg of distilled water was added, the device was sealed, and the reaction was carried out at a temperature of 180℃ and a pressure of 1.5 MPa for 3 h. The mixture was filtered, and the filtrate was cooled to room temperature. After freeze-drying, the tea polyphenol polymer (tea pigment) was obtained.

[0058] The above-mentioned sulfated tea oil preparation: 1 kg of crushed tea cake powder was added to a subcritical treatment device, 15 kg of 90% ethanol aqueous solution was added, the device was sealed, and the reaction was carried out at 150℃ and 1.5 MPa for 3 h. The mixture was filtered, and the filtrate was cooled to room temperature. 10% NaCl was added, and the mixture was centrifuged. The upper layer was evaporated to dryness to obtain tea oil, which was then subjected to conventional sulfation treatment to obtain tea oil fatliquoring agent.

[0059] The high-comfort eco-friendly leather produced by the technical solution of this application was tested, as follows: The above are merely specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantial modifications made to the present invention using this concept shall be considered as infringing upon the protection scope of the present invention.

Claims

1. A method for preparing high-comfort eco-leather based on all-natural materials, characterized in that, The process includes the following steps: batching → pre-soaking → de-fleshing and trimming → main soaking → de-fleshing and trimming → enzymatic hair removal → liming → splitting and trimming → deliming → softening → acid soaking → tanning with tannin-tea polyphenol polymer-zeolite combination → squeezing, smoothing, and sanding → rewetting and filling → fatliquoring → finishing. in, Batching: Using wet cowhide as raw material, select groups with basically the same weight, area, and color as a group, weigh them, and add 130% to the weight for measurement; Pre-soaking: Place the batched salted beef hides into a drum, add 200% water at 19-21℃, 0.2-0.3% tea saponin cleaning agent, 0.2-0.3% penetrant, 0.1-0.2% degreasing agent, and 0.3-0.5% wood ash. Rotate for 10 minutes, then stop for 30 minutes; speed 2-3 rpm; control temperature at 19-21℃, pH 6.3-6.7, and Baume degree 8-9; repeat 4-6 times; wash with water, remove from the drum; remove the hides and trim the edges. Main soaking: Place the pre-soaked, de-fleshed, and trimmed cowhide into a drum, add 200% water at 18-22℃, and rotate the drum at 3 rpm; add 0.2-0.3% tea saponin cleaning agent, 0.2-0.3% penetrant, 0.2-0.3% soaking agent, and 0.2-0.3% degreasing agent, rotate for 10 minutes, and stop for 20 minutes; control the pH to 6.3-6.7, rotate the drum at 2-3 rpm, and repeat 1-3 times; add 0.2-0.4% wood ash and 0.1-0.3% green tea bactericide, adjust the pH to 9.5-10.5, rotate for 10 minutes, and stop for 20 minutes; repeat 5-8 times until fully transparent and the cut is milky white; wash with water and remove from the drum; Enzymatic hair removal: After soaking, removing flesh, and trimming, the soaked cowhide is placed into a rotating drum. 100% chlorine solution at 24-28℃ is added, and the drum speed is 6-8 rpm. The pH is adjusted to 9.0-9.

5. 0.3% penetrant, 1.0-1.5% nano-negative ion powder, and 0.7-1.3% compound enzyme A are added, and the drum is rotated for 30 minutes. 0.3-0.5% keratinase K is added, and the drum is rotated for another 30 minutes. The hair removal rate is checked. If the hair removal rate is greater than 90%, proceed to the next step; otherwise, continue rotating for 30-60 minutes. The hide is then washed with water, the hair is filtered, and the liquid is drained. Lime impregnation: Place bovine de-limed hides with a hair removal rate >90% into a drum, add 100% water at 24-26℃, and rotate the drum at 3-5 rpm; add 0.3% penetrant and 2% lime, and rotate for 60 min; add 100% water at 24-26℃, 50% of a 20% wood ash solution, and 0.15-0.2% of a 30% sodium hydroxide solution, and rotate for 60 min; then rotate for 5 min, stop for 55 min, and repeat 5-8 times; wash with water and remove from the drum; Deliming: Place the dehaired and split bovine hide into a rotating drum, add 50-100% water at 30-35℃, 0.3% penetrant, and 0.7-1.0% non-ammonium organic acid deliming agent. Rotate for 15-30 minutes at 6 rpm. Then add another 0.7-1.5% non-ammonium organic acid deliming agent and rotate for 15-30 minutes. Adjust the pH to 8.0-8.

5. Softening: Continue adding 0.2-0.5% ammonium-free softening enzyme and 0.3% defatting agent, incubate for 10 minutes, then stop for 20 minutes; adjust the temperature to 30-32℃ and pH to 7.5-8.5, incubate for 10 minutes, then stop for 20 minutes; repeat 2-3 times. When the buttock incision shows no color change in phenolphthalein reagent, softening is considered complete; wash with water and remove from the drum; Acid soaking: Place the softened raw cow hide into a rotating drum, add 50-150% water at 23-25℃, add 7-10% sodium chloride, and rotate for 10 minutes at 8 rpm; adjust the Baumé degree to ≥7; while rotating, add 0.5-1.5% formic acid diluted with 8-10 times room temperature water, and rotate for 30 minutes; add 0.2-0.8% concentrated sulfuric acid diluted with 8-10 times room temperature water, adjust the pH to 2.5-3.0, and rotate for 60-180 minutes; control the liquid to 50%; then add 10% of a 20% wood ash solution in portions, and rotate for 30 minutes; adjust the pH to 5.5-6.0; add 4-6% sodium sulfate, and rotate for 60 minutes; Tannin-tea polyphenol-zeolite combined tanning: This process is carried out in the same solution as the pickling solution. Add 5-15% tannin and 10-30% tea polyphenol, and rotate for 300-600 minutes. After complete penetration, add 50% water at 40-50℃ and rotate for 60 minutes. Then, add 0.1% formic acid in portions and rotate for 30 minutes each time. Adjust the pH to 3.0-3.5 and rotate for 30 minutes. Add 2-4% zeolite tanning agent and rotate for 30-60 minutes. Add 6-8% zeolite tanning agent and rotate for 30-60 minutes. Add wood ash to adjust the pH to 5.4-5.6 and rotate for 60-120 minutes. Drain the solution and remove from the drum. Buffing: After squeezing out water and shaving evenly, the wet white leather is laid flat and buffed with sandpaper from a buffing machine to make its grain surface regular and uniform. Filling: Place the wet white leather, after squeezing out water, shaving, and sanding, into a rotating drum. Add 80-100% water and 1% sodium formate, and rotate for 15 minutes. Add 10% of a 20% wood ash solution to adjust the pH to 5.5-6.

5. Add 3-5% protein filler and 3-5% natural dye, and rotate for 60-120 minutes. Adjust the pH to 4.3-4.8 with formic acid and rotate for 15 minutes. Wash with water and drain. Fat addition: Add 100-150% water at 45-55℃, 9-18% sulfated tea oil, 2% sulfated cow hoof oil, 2% lecithin fatliquoring agent, and 4% natural compound fatliquoring agent. Rotate for 90 minutes, then adjust the pH to 3.6-3.8 with formic acid, rotate for 30 minutes, wash with 300% water, and remove from drum.

2. The method for preparing high-comfort eco-leather based on all-natural materials as described in claim 1, characterized in that, The finishing process is as follows: dehydration and stretching → vacuum drying → hanging and drying → rehydration → softening by tumbling → stretching and drying → sealing the base → troweling → top coating → softening → rolling → measuring and warehousing; among which... Dewatering and stretching: Performed on a reciprocating dewatering and stretching machine with a blade spacing of 1.10-1.15 mm, a dewatering pressure of 30 bar, and a feed speed of 20-25 m / min; the moisture content after dewatering is controlled at 50-55%. Vacuum drying: carried out in a vacuum dryer at a temperature of 45℃ for 500 seconds and a negative pressure of 23-26 Mbar; the moisture content after vacuum drying is controlled at 23-30%. Hanging and drying: carried out on a hanging drying line, with a hanging time of 24 hours. The moisture content after hanging and drying is controlled at 13-18%. Drying: The drying process was carried out in a constant temperature and humidity drying oven. The temperatures of the three ovens were 37℃, 42℃, and 48℃, respectively; the humidity was 30-35%; and the drying time was 12 hours. The moisture content after drying was controlled at 6-10%. Rehydration: Performed on a rehydration machine, the moisture content is controlled at 20-25% after rehydration; Tumbling and softening: This is carried out in a stainless steel octagonal tumbling and softening drum at a speed of 15 r / min for 6 hours. The drum rotates in both directions, and the internal temperature is automatically controlled at 25-30℃. After tumbling and softening, the moisture content of the raw leather is 18-20%. Stretching: Performed on a horizontal stretching machine, oven temperature 50 ℃, stretching distance 6 cm, clamping distance 10-12 cm, raw leather time in oven 20 min, raw leather moisture content 14%-18%; Primer application: Operate on a spray gun, with a coating amount of approximately 5-10 g / sf, spraying 1-3 times, each time 3-5 g / sf2, with a coating amount of approximately 3-15 g / sf2; the coating agent formula is as follows: 500-1000 parts water, 500-800 parts water-soluble protein binder, 200-300 parts modified protein and modified protein gloss agent, 20-100 parts penetrant, and 50-100 parts bio-based additives; Calendering: Performed on a board ironing machine at a board surface temperature of 100℃, a pressure of 30kg, and a time of 2s. Top Coating: Operate on a computer-controlled sprayer, spraying 1-3 times, each time 2-3 g / sf2, with a coating amount of approximately 3-5 g / sf2; the coating agent formula is as follows: 100-800 parts water, 10-20 parts graphene-modified silicone hand feel agent, 10-20 parts graphene oxide dispersion, 50-100 parts γ-aminopropyltriethoxysilane, 200-400 parts modified protein brightener, 20-100 parts penetrant, and 50-100 parts bio-based additives; Oscillating softening: Operated on an oscillating softening machine with the following parameters: conveying speed 9.5 m / min, number of stages 5; Blazing: Operated on a pass-through ironing machine, with a temperature of 120 ℃, a pressure of 20-30 kg, and a speed of 8 m / min.

3. The method for preparing a high-comfort eco-leather based on all-natural materials as described in claim 1, characterized in that, Preparation of the tea saponin cleaning agent: 1 kg of pulverized tea cake powder is added to a subcritical treatment device, along with 10-15 kg of 70-90% ethanol aqueous solution. The device is sealed and reacted at a temperature of 105-150℃ and a pressure of 0.5-1.5 MPa for 0.5-3 hours. The mixture is then filtered, and the filtrate is cooled to room temperature. 0.5-10% NaCl is added, and the mixture is centrifuged. The lower layer is evaporated to dryness to obtain tea saponin. The tea saponin is then mixed with wood ash and acetic acid to obtain the tea saponin cleaning agent.

4. The method for preparing a high-comfort eco-leather based on all-natural materials as described in claim 1, characterized in that, Preparation of plant ash: Waste wood and residues from natural plant materials produced by this patented technology are burned, the ash is collected, crushed, and the plant ash is poured into water, stirred, and impurities are filtered out to obtain a plant ash solution.

5. The method for preparing high-comfort eco-leather based on all-natural materials as described in claim 1, characterized in that, Preparation of the green tea bactericide: 1 kg of crushed, non-grade green tea powder is added to a subcritical treatment device, 10-30 kg of 75-99% ethanol aqueous solution is added, the device is sealed, and the reaction is carried out at a temperature of 60-80℃ for 0.5-5 h. The mixture is filtered, and the filtrate is cooled to room temperature. The ethanol is removed, and the mixture is concentrated and freeze-dried to obtain the green tea bactericide.

6. The method for preparing a high-comfort eco-leather based on all-natural materials as described in claim 1, characterized in that, Preparation of the tea polyphenol polymer: 1 kg of crushed non-grade green tea powder is added to a subcritical treatment device, along with 15-45 kg of distilled water. The device is sealed and reacted at a temperature of 120-180℃ and a pressure of 0.5-1.5 MPa for 0.5-3 hours. The mixture is then filtered, and the filtrate is cooled to room temperature. After freeze-drying, the tea polyphenol polymer is obtained.

7. The method for preparing a high-comfort eco-leather based on all-natural materials as described in claim 1, characterized in that, The preparation of sulfated tea oil is as follows: 1 kg of crushed tea cake powder is added to a subcritical treatment device, along with 10-15 kg of 70-90% ethanol aqueous solution. The device is sealed and reacted at a temperature of 105-150℃ and a pressure of 0.5-1.5 MPa for 0.5-3 hours. The mixture is then filtered, and the filtrate is cooled to room temperature. 0.5-10% NaCl is added, and the mixture is centrifuged. The upper layer is evaporated to dryness to obtain tea oil, which is then subjected to conventional sulfation treatment to obtain a tea oil fatliquoring agent.

Images