Low-carbon and energy-saving frosted leather manufacturing process

Abstract

The invention relates to a low-carbon and energy-saving frosted leather manufacturing technology. The technology comprises the following steps of leather buffing, rewetting, retanning, neutralizing, dyeing and fat liquoring, wringing and stretching, hanging and drying, moisture regaining, milling, toggling drying and measuring scale warehousing. Wherein leather buffing is conducted, specifically, the wet blue leather subjected to shaving treatment is flattened, and abrasive paper of a leather buffing machine is adopted for conducting leather buffing treatment on the wet blue leather till horizontal fluff of the wet blue leather is erected, and a fluff layer is formed. The buffing process is advanced, the buffing process can be completed only through one-time dyeing operation, the whole technological process is optimized, the production time is shortened, the labor cost is reduced, and the production efficiency is improved; moreover, a coating section is omitted, so that the production period is further shortened, and carbon emission caused by long-time production is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of leather making, in particular to a low-carbon and energy-saving frosted leather manufacturing process. Background Art

[0002] In the leather goods sector, nubuck leather, with its unique matte texture and suede visual effect, has always occupied a prominent position in the market and is highly favored by consumers. However, with the global trend of advocating low-carbon, environmentally friendly, and sustainable development, the challenges facing traditional nubuck leather manufacturing are becoming increasingly prominent. The traditional nubuck leather manufacturing process is relatively complex, covering multiple key steps, including: rewetting → retanning → neutralization → dyeing and fatliquoring → squeezing and stretching → vacuum drying → air drying → moisture regain → oscillation softening → stretching board drying → grinding → re-dyeing → squeezing and stretching → air drying → moisture regain → tumbling and softening → stretching board drying → finishing → measuring and storage (the pre-tanning and tanning stages are not described in detail).

[0003] In the manufacturing process of nubuck leather, the grinding process is a key step in forming the suede effect and achieving initial shaping, but this process will damage the leather grain, thereby revealing the leather's base color. In order to achieve the desired color of the finished leather, traditional processes often require secondary or even multiple re-dyeing operations. This process not only consumes a large amount of water resources, chemical materials and energy, but also causes serious environmental pollution problems, discharging wastewater containing a variety of harmful chemicals, which runs counter to the current low-carbon concept advocated. Moreover, even after multiple re-dyeing, the color of the finished leather is still difficult to accurately meet customer needs, and subsequent finishing treatment is required. This not only increases the complexity of the production process, but also significantly increases production costs, thereby limiting the market competitiveness of nubuck leather products and is not conducive to the overall low-carbon sustainable development of the industry.

[0004] Reducing high-energy consumption and high-emission processes in traditional processes is of great significance for achieving green transformation in the industry and reducing carbon emissions. This case arose in view of this. Summary of the Invention

[0005] The present invention provides a low-carbon and energy-saving frosted leather manufacturing process to solve the problem that traditional frosted leather manufacturing consumes a large amount of water resources, chemical materials and energy, and also causes serious environmental pollution. By optimizing the process flow, energy consumption and pollution are reduced, production costs are lowered, and production efficiency and product quality are improved.

[0006] The present invention adopts the following technical solutions:

[0007] A low-carbon and energy-saving frosted leather manufacturing process comprises the following steps: leather grinding → rewetting → retanning → neutralization → dyeing and fatliquoring → squeezing and stretching → hanging and drying → moisture regain → tumbling and softening → drying on a stretching board → measuring and warehousing; wherein,

[0008] Grinding: Lay the shaved wet blue leather flat and use the sandpaper of the leather grinding machine to grind the wet blue leather until the prostrate hairs of the wet blue leather stand up to form a velvet layer;

[0009] Dyeing and fatliquoring: add 10%-100% water and 1.0%-4.0% dye to the drum after the neutralization process, control the internal temperature of the drum at 30°C, and rotate for 60 minutes; add 2.0%-10.0% resin retanning agent and rotate for 90 minutes; add 1.0%-2.0% synthetic fatliquor, 0.5%-1.0% neat's foot oil, 2.0%-7.0% dicyandiamide resin retanning agent, 1.0%-4.0% melamine resin retanning agent, 2.0%-5.0% replaced tannin, 3.0%-6.0% urea-formaldehyde resin retanning agent, and rotate for 30-60 minutes; add 1.0%-5.0% saturated tannin, 1.0%-5.0% synthetic retanning agent, 2.0%-4.0% quebracho tannin extract, 1.0%-3.0% wattle bark tannin extract, and rotate for 30-60 minutes; add 0.5%-4.0% high-efficiency dye , rotate for 90-120 minutes, check whether the buttock incision is dyed thoroughly; add 50℃ water 100%-200%, protein filler 1.0%-4.0%, rotate for 20 minutes; add lanolin fatliquor 1.0%-2.0%, synthetic neat's foot oil 1.0%-2.0%, synthetic fatliquor 0.5%-3.0%, neat's foot oil 1.0%-3.0%, waterproof fatliquor 1.0%-3.0%, synthetic fatliquor 1.0%-3.0%, rotate for 30-60 minutes; add high-efficiency dye 0.5%-2.0%, rotate for 30-60 minutes; add formic acid 0.5%-1.0%, rotate for 10-40 minutes; add formic acid 0.5%-1.0%, rotate for 10-40 minutes; add formic acid 1.0%-2.0%, rotate for 10-40 minutes, drain the liquid, wash with water, take out the drum, and put it on the horse for standing.

[0010] Furthermore, the rewetting step comprises: placing the wet blue leather after the grinding treatment into a drum, adding 150%-200% water, 0.5%-1.0% formic acid, 0.5%-1.0% oxalic acid, 0.3%-1.0% surfactant, and 0.5%-1.0% deliming auxiliary agent into the drum, controlling the temperature inside the drum to 50°C, and rotating the drum for 60 minutes; adding 1.0%-2.0% softening enzyme and 0.5%-1.0% fatliquor, and rotating the drum for 120 minutes; adding 0.5%-1.0% fatty aldehyde tanning agent, and rotating the drum for 60 minutes, draining the liquid, and washing with water.

[0011] Furthermore, the retanning method comprises the following steps: adding 100%-150% of water and 0.5%-1.0% of dye into a rotary drum, controlling the temperature inside the drum to 35-40°C, and rotating the drum for 20 minutes; adding 0.1%-0.5% of formic acid, rotating the drum for 10 minutes; adding 2.0%-10.0% of chromium powder and 1.5%-2.0% of synthetic fatliquor, and rotating the drum for 30 minutes; adding 2.0%-4.0% of retanning agent, rotating the drum for 90-120 minutes; adding 1.0%-4.0% of aldehyde tanning agent, and rotating the drum for 30 minutes; adding 0.5%-2.0% of sodium formate and 0.5%-1.0% of baking soda, and rotating the drum for 30 minutes; adding 0.5%-1.0% of baking soda, and rotating the drum for 60-90 minutes, draining the liquid, and washing with water.

[0012] Furthermore, the neutralization comprises the following steps: adding 100%-150% of water to the drum, neutralizing 2.0%-3.0% of tannin, and 0.5%-1.5% of ammonium carbonate, controlling the temperature inside the drum to 30°C, and rotating the drum for 60 minutes; adding 1.0%-3.0% of a polymer retanning agent and 1.0%-4.0% of a styrene-maleic anhydride resin retanning agent, and rotating the drum for 60 minutes; rotating the drum for 5 minutes every hour, stopping the drum for 55 minutes, and continuing the process until the next morning, draining the drum, and washing the drum with water.

[0013] Furthermore, after dyeing and fat-liquoring, the processes of squeezing water and stretching, hanging to dry, regaining moisture, softening, drying on a stretching board, and measuring and warehousing are carried out in sequence.

[0014] Furthermore, the model of the above-mentioned sandpaper is 320~400#.

[0015] It can be seen from the above description of the present invention that, compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention advances the leather grinding process and only requires one dyeing operation to complete it, thereby optimizing the entire process flow, shortening production time, reducing labor costs, and improving production efficiency; and omitting the finishing section further shortens the production cycle and reduces carbon emissions caused by long-term production.

[0017] 2. The present invention omits multiple re-dyeing and painting operations, and at the same time eliminates a series of supporting operations caused by re-dyeing, significantly reducing the consumption of water resources, chemical materials and energy. Compared with traditional processes, it can reduce water consumption by about 30% and energy consumption by 20%.

[0018] 3. The present invention effectively reduces wastewater discharge and pollutant content by omitting the back-dyeing step and adopting high-efficiency dyes, thereby achieving environmentally friendly protection.

[0019] 4. The high-efficiency dyes used in the present invention can ensure that the leather achieves a uniform and deep coloring effect, making the color of the product more vivid and lasting; optimizing the process flow and improving the overall quality and stability of the product. DETAILED DESCRIPTION

[0020] Example 1:

[0021] A low-carbon and energy-saving frosted leather manufacturing process comprises the following steps: leather grinding → rewetting → retanning → neutralization → dyeing and fatliquoring → squeezing and stretching → hanging and drying → moisture regain → tumbling and softening → drying on a stretching board → measuring and warehousing; wherein,

[0022] Leather grinding: Flatten the shaved wet blue leather and use the sandpaper of the leather grinding machine to grind the wet blue leather until the prostrate hairs of the wet blue leather stand up to show a velvet layer. The sandpaper model is 320~400#.

[0023] Rewetting: The wet blue leather after the buffing treatment was placed in a drum, and 200% water, 0.7% formic acid, 0.5% oxalic acid, 0.3% surfactant (BORRON SAF, Deruipi Chemical Co., Ltd.), and 0.5% deliming auxiliary agent (BLANCOROL CGA-C, LANXESS) were added to the drum. The temperature in the drum was controlled at 50°C and the drum was rotated for 60 minutes. 1.5% softening enzyme (DESOBATE TN, Sichuan Desaier New Material Technology Co., Ltd.) and 0.5% fatliquor (TRUPON OSL, Tang Pule Chemical Dye (Jiaxing) Co., Ltd.) were added. The drum was rotated for 120 minutes. 0.5% fatty aldehyde tanning agent (BITAN ZX-30, UNITEK) was added. The drum was rotated for 60 minutes, the liquid was drained, and the drum was washed with water.

[0024] Retanning: Add 120% water and 1.0% dye to a drum, control the inner temperature of the drum at 38°C, and rotate for 20 min; add 0.2% formic acid and rotate for 10 min; add 6.0% chromium powder (Brother Technology Co., Ltd.) and 1.5% synthetic fatliquor (PELLANGLHliq, Kekai Fine Chemicals (Shanghai) Co., Ltd.) and rotate for 30 min; add 2.0% retanning agent (Shengtandan JAN, Zhejiang Shenghui Chemical Co., Ltd.) and rotate for 90 min; add 2.0% aldehyde tanning agent (NOVALTAN PF, ZSMA Chemicals (China) Co., Ltd.) and rotate for 30 min; add 1.5% sodium formate and 0.5% baking soda and rotate for 30 min; add 0.5% baking soda and rotate for 60 min, drain and wash with water.

[0025] Neutralization: Add 150% water, 2.0% neutralizing tannin (TANMATE NSL, Fujian Bates Chemical Industry Co., Ltd.), and 0.8% ammonium carbonate to the drum, control the drum temperature at 30°C, and rotate for 60 minutes; add 3.0% polymer retanning agent (MAGNOPALTGR, De Ruipi Chemical Co., Ltd.) and 3.0% styrene-maleic anhydride resin retanning agent (BITAN 25, UNITEK) and rotate for 60 minutes; then rotate for 5 minutes every hour, rest for 55 minutes, and continue until the next morning. Drain the liquid and rinse with water.

[0026] Dyeing and fatliquoring: 30% water and 3.0% dye were added to the drum, the drum temperature was controlled at 30°C, and the drum was rotated for 60 minutes; 7.0% resin retanning agent was added and the drum was rotated for 90 minutes; 1.0% synthetic fatliquor (PELLASTOL 94S, ZIMA Chemical (China) Co., Ltd.), 0.5% neat's foot oil (BIOTOIL CK, UNITEK), 6.0% dicyandiamide resin retanning agent (BITAN R19, UNITEK), 3.0% melamine resin retanning agent (TRUPOTAN HB, Tumpler Chemical Dye (Jiaxing) Co., Ltd.), 3.0% substituted tannin (TANIGAN OS-A, LANXESS), 3.0% urea-formaldehyde resin retanning agent (Shengtandan XH-SY, Zhejiang Shenghui Chemical Co., Ltd.) were added and the drum was rotated for 40 minutes; full tannin (LECOREN M-AR, FGL Company) 4.0%, synthetic retanning agent (Bastan AN, BASF Company) 3.0%, quebracho tannin extract (UNITAN ATO, UNITAN Company) 2.0%, wattle bark tannin extract (MIMOSA ME, MIMOSA Company) 2.0%, rotate for 40 minutes; add high-efficiency dye (black dye 505, Shanghai Hanxiong Dye Chemical Co., Ltd.) 2.0%, rotate for 90 minutes, and check whether the buttock incision is dyed thoroughly; add 50℃ water 150%, protein filler (DESOBATE FB, Sichuan Desaier New Material Technology Co., Ltd.) 3.0%, rotate for 20 minutes; add lanolin fatliquor (PATEK ZLN, Bisso Company) 1.0%, synthetic neat's foot oil (BIOTOIL OPE, UNITEK Company) 1.0%, synthetic fatliquor 1.0%, neat's foot oil 2.0%, waterproof fatliquor (TRUPOSIST D, Temple Chemical Dye (Jiaxing) Co., Ltd.) 2.0%, synthetic fatliquor (TRUPON V2, Temple Chemical Dye (Jiaxing) Co., Ltd.) 1.0%, rotate for 30 minutes; add 0.5% high-efficiency dye, rotate for 30 minutes; add 0.5% formic acid, rotate for 20 minutes; add 0.5% formic acid, rotate for 20 minutes; add 1.0% formic acid, rotate for 20 minutes, drain the liquid, wash with water, remove from the drum, and let it stand.

[0027] Squeeze out water and stretch → hang to dry → regain moisture → soften → dry on stretch board → measure and put into storage.

[0028] Example 2:

[0029] A low-carbon and energy-saving frosted leather manufacturing process comprises the following steps: leather grinding → rewetting → retanning → neutralization → dyeing and fatliquoring → squeezing and stretching → hanging and drying → moisture regain → tumbling and softening → drying on a stretching board → measuring and warehousing; wherein,

[0030] Leather grinding: Flatten the shaved wet blue leather and use the sandpaper of the leather grinding machine to grind the wet blue leather until the prostrate hairs of the wet blue leather stand up to show a velvet layer. The sandpaper model is 320~400#.

[0031] Rewetting: Place the wet blue leather after the grinding treatment into a drum, add 150% water, 0.5% formic acid, 0.5% oxalic acid, 0.3% surfactant, 0.5% deliming auxiliary agent into the drum, control the temperature inside the drum at 50℃, and rotate for 60 minutes; add 1.0% softening enzyme and 0.5% fatliquor, rotate for 120 minutes; add 0.5% fatty aldehyde tanning agent, rotate for 60 minutes, drain the liquid, and wash with water.

[0032] Retanning: add 100% water and 1.0% dye to the drum, control the internal temperature of the drum at 35°C, and rotate for 20 minutes; add 0.1% formic acid, rotate for 10 minutes; add 2.0% chromium powder and 1.5% synthetic fatliquor, rotate for 30 minutes; add 2.0% retanning agent, rotate for 90 minutes; add 1.0% aldehyde tanning agent, rotate for 30 minutes; add 0.5% sodium formate and 0.5% baking soda, rotate for 30 minutes; add 0.5% baking soda, rotate for 60 minutes, drain the liquid, and wash with water.

[0033] Neutralization: Add 100% water, 2.0% neutralized tannin, 0.5% ammonium carbonate into the drum, control the temperature inside the drum at 30°C, and rotate for 60 minutes; add 1.0% polymer retanning agent and 1.0% styrene-maleic anhydride resin retanning agent, and rotate for 60 minutes; then rotate for 5 minutes every hour, stop for 55 minutes, and continue until the next morning, drain the liquid, and wash with water.

[0034] Dyeing and fatliquoring: add 20% water and 1.0% dye to the drum, control the inner temperature of the drum at 30℃, and rotate for 60 minutes; add 2.0% resin retanning agent and rotate for 90 minutes; add 1.0% synthetic fatliquor, 0.5% neat's foot oil, 2.0% dicyandiamide resin retanning agent, 1.0% melamine resin retanning agent, 2.0% replacement tannin, 3.0% urea-formaldehyde resin retanning agent and rotate for 30 minutes; add 1.0% full tannin, 1.0% synthetic retanning agent, 2.0% quebracho tannin, 1.0% wattle bark tannin and rotate for 30 minutes; add 0.5% high-efficiency dye and rotate. After 90 minutes, check whether the buttock incision is dyed thoroughly; add 100% 50℃ water and 1.0% protein filler, and rotate for 20 minutes; add 1.0% lanolin fatliquor, 1.0% synthetic neat's foot oil, 0.5% synthetic fatliquor, 1.0% neat's foot oil, 1.0% waterproof fatliquor, 1.0% synthetic fatliquor, and rotate for 30 minutes; add 0.5% high-efficiency dye and rotate for 30 minutes; add 0.5% formic acid and rotate for 10 minutes; add 0.5% formic acid and rotate for 10 minutes; add 1.0% formic acid and rotate for 10 minutes, drain the liquid, wash with water, remove from the drum, and set it aside for standing.

[0035] Squeeze out water and stretch → hang to dry → regain moisture → soften → dry on stretch board → measure and put into storage.

[0036] Example 3:

[0037] A low-carbon and energy-saving frosted leather manufacturing process comprises the following steps: leather grinding → rewetting → retanning → neutralization → dyeing and fatliquoring → squeezing and stretching → hanging and drying → moisture regain → tumbling and softening → drying on a stretching board → measuring and warehousing; wherein,

[0038] Leather grinding: Flatten the shaved wet blue leather and use the sandpaper of the leather grinding machine to grind the wet blue leather until the prostrate hairs of the wet blue leather stand up to show a velvet layer. The sandpaper model is 320~400#.

[0039] Rewetting: Place the wet blue leather after the grinding treatment into a drum, add 200% water, 1.0% formic acid, 1.0% oxalic acid, 1.0% surfactant, and 1.0% deliming auxiliary agent into the drum, control the temperature inside the drum at 50°C, and rotate for 60 minutes; add 2.0% softening enzyme and 1.0% fatliquor, and rotate for 120 minutes; add 1.0% fatty aldehyde tanning agent, rotate for 60 minutes, drain the liquid, and wash with water.

[0040] Retanning: add 150% water and 1.0% dye to the drum, control the inner temperature of the drum at 40°C, and rotate for 20 minutes; add 0.5% formic acid, rotate for 10 minutes; add 10.0% chromium powder and 2.0% synthetic fatliquor, rotate for 30 minutes; add 4.0% retanning agent, rotate for 120 minutes; add 2.0% aldehyde tanning agent, rotate for 30 minutes; add 2.0% sodium formate and 0.5% baking soda, rotate for 30 minutes; add 1.0% baking soda, rotate for 90 minutes, drain the liquid, and wash with water.

[0041] Neutralization: Add 150% water, 3.0% neutralized tannin, 0.8% ammonium carbonate into the drum, control the temperature inside the drum at 30°C, and rotate for 60 minutes; add 3.0% polymer retanning agent and 4.0% styrene-maleic anhydride resin retanning agent, and rotate for 60 minutes; then rotate for 5 minutes every hour, stop for 55 minutes, and continue until the next morning, drain the liquid, and wash with water.

[0042] Dyeing and fatliquoring: add 50% water and 4.0% dye to the drum, control the inner temperature of the drum at 30℃, and rotate for 60 minutes; add 10.0% resin retanning agent and rotate for 90 minutes; add 2.0% synthetic fatliquor, 1.0% neat's foot oil, 7.0% dicyandiamide resin retanning agent, 4.0% melamine resin retanning agent, 5.0% replacement tannin, 6.0% urea-formaldehyde resin retanning agent and rotate for 60 minutes; add 5.0% full tannin, 5.0% synthetic retanning agent, 4.0% quebracho tannin, 3.0% wattle bark tannin and rotate for 60 minutes; add 4.0% high-efficiency dye and rotate. After 120 minutes, check whether the buttock incision is dyed thoroughly; add 200% 50℃ water and 4.0% protein filler, and rotate for 20 minutes; add 2.0% lanolin fatliquor, 2.0% synthetic neat's foot oil, 3.0% synthetic fatliquor, 3.0% neat's foot oil, 3.0% waterproof fatliquor, 3.0% synthetic fatliquor, and rotate for 60 minutes; add 2.0% high-efficiency dye, and rotate for 60 minutes; add 1.0% formic acid, and rotate for 40 minutes; add 1.0% formic acid, and rotate for 40 minutes; add 2.0% formic acid, and rotate for 40 minutes, drain the liquid, wash with water, remove from the drum, and set it aside for standing.

[0043] Squeeze out water and stretch → hang to dry → regain moisture → soften → dry on stretch board → measure and put into storage.

[0044] Table 1 Process comparison table

[0045]

[0046]

[0047] Note: 1. The arrangement of the processes does not follow the order of the processes;

[0048] 2. The re-dyeing step of the traditional process is tentatively performed once. If multiple re-dyeing is performed, a series of supporting operations caused by re-dyeing will increase accordingly.

[0049] As can be seen from Table 1 above, the present invention advances the leather grinding process and only requires one dyeing operation to complete it, thereby optimizing the entire process flow, shortening production time, reducing labor costs, and improving production efficiency.

[0050] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited to this. Any non-substantial changes to the present invention using this concept shall be deemed as an infringement of the protection scope of the present invention.

Claims

1. A low-carbon and energy-saving frosted leather manufacturing process, characterized in that: The following steps are involved: Grinding → Rewetting → Retanning → Neutralization → Dyeing and Fatting → Squeezing and Stretching → Hanging and Drying → Rewetting → Tumbling and Softening → Drying on Stretching Board → Measuring and Storage; Among them, Grinding: Lay the shaved wet blue leather flat and use the sandpaper of the leather grinding machine to grind the wet blue leather until the prostrate hairs of the wet blue leather stand up to form a velvet layer; Dyeing and fatliquoring: add 10%-100% water and 1.0%-4.0% dye to the drum after the neutralization process, control the internal temperature of the drum at 30°C, and rotate for 60 minutes; add 2.0%-10.0% resin retanning agent and rotate for 90 minutes; add 1.0%-2.0% synthetic fatliquor, 0.5%-1.0% neat's foot oil, 2.0%-7.0% dicyandiamide resin retanning agent, 1.0%-4.0% melamine resin retanning agent, 2.0%-5.0% replaced tannin, 3.0%-6.0% urea-formaldehyde resin retanning agent, and rotate for 30-60 minutes; add 1.0%-5.0% saturated tannin, 1.0%-5.0% synthetic retanning agent, 2.0%-4.0% quebracho tannin extract, 1.0%-3.0% wattle bark tannin extract, and rotate for 30-60 minutes; add 0.5%-4.0% high-efficiency dye , rotate for 90-120 minutes, check whether the buttock incision is dyed thoroughly; add 50℃ water 100%-200%, protein filler 1.0%-4.0%, rotate for 20 minutes; add lanolin fatliquor 1.0%-2.0%, synthetic neat's foot oil 1.0%-2.0%, synthetic fatliquor 0.5%-3.0%, neat's foot oil 1.0%-3.0%, waterproof fatliquor 1.0%-3.0%, synthetic fatliquor 1.0%-3.0%, rotate for 30-60 minutes; add high-efficiency dye 0.5%-2.0%, rotate for 30-60 minutes; add formic acid 0.5%-1.0%, rotate for 10-40 minutes; add formic acid 0.5%-1.0%, rotate for 10-40 minutes; add formic acid 1.0%-2.0%, rotate for 10-40 minutes, drain the liquid, wash with water, take out the drum, and put it on the horse for standing.

2. A low-carbon and energy-saving frosted leather manufacturing process according to claim 1, characterized in that: The rewetting method comprises the following steps: placing wet blue leather after buffing treatment into a rotary drum, adding 150%-200% water, 0.5%-1.0% formic acid, 0.5%-1.0% oxalic acid, 0.3%-1.0% surfactant, and 0.5%-1.0% deliming auxiliary agent into the drum, controlling the temperature inside the drum at 50°C, and rotating the drum for 60 minutes; adding 1.0%-2.0% softening enzyme and 0.5%-1.0% fatliquor, and rotating the drum for 120 minutes; adding 0.5%-1.0% fatty aldehyde tanning agent, and rotating the drum for 60 minutes, draining the liquid, and washing with water.

3. The low-carbon and energy-saving frosted leather manufacturing process according to claim 1, characterized in that: The retanning process comprises the following steps: adding 100%-150% water and 0.5%-1.0% dye into a rotary drum, controlling the inner temperature of the drum at 35-40° C., and rotating the drum for 20 minutes; adding 0.1%-0.5% formic acid, rotating the drum for 10 minutes; adding 2.0%-10.0% chromium powder and 1.5%-2.0% synthetic fatliquor, and rotating the drum for 30 minutes; adding 2.0%-4.0% retanning agent, rotating the drum for 90-120 minutes; adding 1.0%-4.0% aldehyde tanning agent, and rotating the drum for 30 minutes; adding 0.5%-2.0% sodium formate and 0.5%-1.0% baking soda, and rotating the drum for 30 minutes; adding 0.5%-1.0% baking soda, and rotating the drum for 60-90 minutes, draining the liquid, and washing with water.

4. The low-carbon and energy-saving frosted leather manufacturing process according to claim 1, characterized in that: The neutralization comprises the following steps: adding 100%-150% water, 2.0%-3.0% neutralized tannin, 0.5%-1.5% ammonium carbonate into a rotary drum, controlling the inner temperature of the drum at 30°C, and rotating the drum for 60 minutes; adding 1.0%-3.0% polymer retanning agent and 1.0%-4.0% styrene-maleic anhydride resin retanning agent, and rotating the drum for 60 minutes; rotating the drum for 5 minutes every hour, stopping the drum for 55 minutes, and continuing the process until the next morning, draining the drum, and washing the drum with water.

5. The low-carbon and energy-saving frosted leather manufacturing process according to claim 1, characterized in that: After dyeing and greasing, the processes of squeezing water and stretching, hanging to dry, regaining moisture, softening, drying on a stretch board and measuring and storage are carried out in sequence.

6. The low-carbon and energy-saving frosted leather manufacturing process according to claim 1, characterized in that: The sandpaper is of size 320-400#.

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