Preparation method of innovative frost-on-grass leather

Abstract

The invention relates to a preparation method of innovative frost-on-grass leather. The preparation method comprises the following steps of rewetting, retanning, neutralizing, fat liquoring, color register, drying finishing and fleecing. In the step of color register, water and formic acid are added into a rotary drum, the temperature in the rotary drum is controlled to be 50 DEG C, and the rotary drum rotates for 10 min; adding a dyeing auxiliary agent, and rotating for 20 minutes; adding a dye, and rotating for 2-30 minutes; adding formic acid, rotating for 2-30 minutes, discharging liquid, washing with water, and discharging from a drum; the fleece is performed for 2-5 times according to a conventional process so as to accurately grab the inner layer fibers of the leather. According to the preparation method of the frost-on-grass leather, through the combination of the color register procedure and the fleece procedure, the limitation of traditional single-color dyeing is broken through by'frost-on-grass', the dyeing effect of double-color interweaving is achieved, and the additional value and the market competitiveness of leather products are improved through the process innovation.

Description

Technical Field

[0001] The invention relates to the technical field of leather manufacturing, in particular to a method for preparing innovative grass frost leather. Background Art

[0002] As a material with a long history, leather is widely used in a wide range of fields, from clothing accessories to home decoration to car interiors, all of which demonstrate its unique charm. As consumers' aesthetic requirements for leather products continue to increase, traditional leather manufacturing processes are gradually showing limitations in terms of texture and color innovation.

[0003] Traditional leather texture processing techniques, such as embossing and tumbling, can change the appearance of leather to a certain extent, but are often limited by the limitations of process technology, resulting in a single texture, lack of natural feel, and insufficient color expression. These traditional texture processing methods are difficult to meet the needs of modern consumers for personalized and unique leather products.

[0004] In order to break this dilemma, the leather manufacturing industry began to explore new texture processing technologies. Existing new technologies still face certain challenges in creating natural, delicate and layered textures. For example, although some technologies can simulate textures similar to grass leaves or frost, they are often too rigid and lack realism, and fail to fully meet the market's demand for high-quality leather. In view of this, this case came into being. Summary of the invention

[0005] The invention provides a method for preparing an innovative grass frost leather. The existing texture processing technology has the problem of being too stiff and lacking in realism.

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

[0007] An innovative method for preparing grass-frost leather comprises the following steps: rewetting → retanning → neutralization → fatliquoring → coloring → drying and finishing → fleece; calculated by the weight of the raw cowhide material;

[0008] For the above color matching, add 100%-150% water and 0.5%-1.0% formic acid into the drum, control the inner temperature of the drum to 50°C, and rotate for 10 minutes; add 0.5%-1.0% dyeing auxiliary agent, rotate for 20 minutes; add 2.0%-6.0% dye, rotate for 2-30 minutes; add 1.0%-4.0% formic acid, rotate for 2-30 minutes, drain, wash with water, and remove from the drum;

[0009] The above fleece: perform fleece operation 2-5 times according to conventional process to accurately grasp the inner fiber of leather.

[0010] Furthermore, the above rewetting: put the shaved wet blue leather into a drum, add 100%-150% water, 0.3%-0.6% surfactant, 1.0%-2% ammonium sulfate into the drum, control the temperature inside the drum at 30°C, and rotate for 240 minutes; add 0.5%-1.0% oxalic acid, and rotate for 30 minutes; drain and wash.

[0011] The above-mentioned retanning: add 100%-150% water and 0.3%-0.6% formic acid into the drum, control the inner temperature of the drum to 30°C, and rotate for 10 minutes; add 8.0%-10.0% chromium powder, rotate for 120 minutes; add 1.0%-1.5% sodium formate, and rotate for 30 minutes; add 2.0%-2.2% baking soda in 3 times, rotate for 20 minutes each time, then rotate for 60 minutes, stop the drum overnight, rotate for 20 minutes the next morning and drain the liquid.

[0012] Further, the above neutralization: add 100% water, 1.0%-3.0% sodium formate, 1.0%-2.0% baking soda, 1.0%-2.0% neutralizer, 1.0%-2.0% ammonium carbonate into the drum, control the temperature inside the drum at 30°C, and rotate for 30 minutes; add 1.0%-1.2% baking soda, rotate for 50 minutes, drain the liquid, and wash with water.

[0013] Furthermore, the above-mentioned fatliquoring: add 50%-100% water, 1.0%-3.0% phospholipids, 1.0%-3.0% sulfonated oils, 1.0%-2.0% synthetic fatliquor, 1.0%-2.0% synthetic fatliquor, 1.0%-2.0% electrolyte-resistant oil, 1.0%-2.0% neat's foot oil into the drum, control the temperature inside the drum to 50°C, and rotate for 60 minutes; add 1.0%-2.0% polymer retanning agent, rotate for 30 minutes, add 1.0%-2.0% formic acid twice, rotate for 20 minutes each time; add 0.8%-1.0% formic acid, rotate for 20 minutes, and drain.

[0014] 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:

[0015] 1. In the traditional color matching process, the addition of dyes and formic acid is often carried out in a small amount, multiple times and staggered manner, in order to ensure that the color can penetrate evenly and deeply into the leather. In this innovative technology of the present application, after the dye is added all at once, it is immediately rotated quickly for a short and efficient time. The length of time for this rotation step is the optimal value obtained by scientific researchers after repeated experiments and optimization, which aims to maximize the uniform distribution of the dye on the leather surface, while avoiding excessive rotation. The color penetrates too deeply into the leather or the internal structure of the leather is damaged, thereby maintaining a light and uniform dyeing effect similar to "frost on grass". Then, a large amount of formic acid that has been accurately measured is added at one time, and its strong color fixing effect is used to ensure that the dye is not only tightly combined with the leather surface, but also enhances the durability of the color while maintaining a light dyeing effect.

[0016] 2. After the drying and finishing process is completed, the present application performs a fleece process on the flesh side of the leather. The main purpose of this step is to gently grab the fibers of the inner layer of the leather and expose them to the surface. If the dyeing process has been carried out in the previous process, the inner fibers that are grabbed will show the color given by the dyeing process; if the dyeing process has not been carried out, the inner fibers will retain their original color. At the same time, the outer fibers of the leather are dyed with another color through the color overprinting process. Therefore, after the fleece process is completed, the flesh side of the leather will show fibers of two different colors interwoven together, forming a unique heterochromatic effect, like "frost on grass" lightly covering the leather.

[0017] 3. Aesthetic effect: The "grass frost" dyeing effect gives leather products a unique aesthetic of two-color interweaving, which is both classical and modern, satisfying consumers' pursuit of personalized aesthetics and becoming a highlight of the fashion trend.

[0018] 4. Process effect: Through the combination of the overprinting process and the fleece process, "Frost on Grass" breaks through the limitations of traditional single-color dyeing and achieves a two-color interwoven dyeing effect. This process innovation improves the added value and market competitiveness of leather products.

[0019] 5. Market effect: The "Grass Frost" dyeing effect meets the market demand for personalized leather products, provides a unique competitive advantage for the brand, enhances market competitiveness, and promotes the diversified development of the leather products market. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a picture of the flesh surface of the "Frost on Grass" leather of the present invention.

[0021] Figure 2 This is a picture 1 of the partial flesh surface of the "Grass Cream" leather of the present invention.

[0022] Figure 3This is the second picture of the partial flesh surface of the "Grass Cream" leather of the present invention. DETAILED DESCRIPTION

[0023] An innovative "grass frost" leather manufacturing process, including the following process steps:

[0024] Rewetting: put the shaved wet blue leather into a drum, add 100% water, 0.3% surfactant (BORRON SAF, De Ruipi Chemical Co., Ltd.), 1.0% ammonium sulfate into the drum, control the temperature inside the drum at 30°C, rotate for 240 minutes; add 0.5% oxalic acid, rotate for 30 minutes; drain and wash with water.

[0025] Retanning: add 100% water and 0.3% formic acid into the drum, control the inner temperature of the drum at 30°C, and rotate for 10 minutes; add 10.0% chromium powder (Brother Technology Co., Ltd.), rotate for 120 minutes; add 1.5% sodium formate, rotate for 30 minutes; add 2.2% baking soda in 3 times, rotate for 20 minutes each time, rotate for another 60 minutes, stop the drum overnight, rotate for 20 minutes the next morning and drain the liquid.

[0026] Neutralization: add 100% water, 3.0% sodium formate, 1.0% baking soda, 1.0% neutralizer (TANMATE NSL, Fujian Batts Chemical Industry Co., Ltd.), and 1.0% ammonium carbonate into the drum, control the inner temperature of the drum at 30°C, and rotate for 30 minutes; add 1.2% baking soda, rotate for 50 minutes, drain the liquid, and wash with water.

[0027] Fatliquoring: add 50% water, 3.0% phospholipid (PROVOL BA, Sima Chemical (China) Co., Ltd.), 3.0% sulfonated grease (INGRASSANTE H50, ALPA Company), 2.0% synthetic fatliquor (PELLASTOL 94S, Sima Chemical (China) Co., Ltd.), 1.0% synthetic fatliquor (TRUPON DB, Temple Chemical Dye (Jiaxing) Co., Ltd.), 2.0% electrolyte resistant oil (PELLAN GLH liq, Kekai Fine Chemical (Shanghai) Co., Ltd.), 1.0% neat's foot oil (30CT, ATLAS Company) into the drum, control the inner temperature of the drum at 50°C, and rotate for 60 minutes; add 2.0% polymer retanning agent (Wangebao TGR, Deruipi Chemical Co., Ltd.), rotate for 30 minutes, add 1.0% formic acid twice, rotate for 20 minutes each time; add 0.8% formic acid, rotate for 20 minutes, and drain.

[0028] Color matching: add 150% water and 0.5% formic acid into the drum, control the inner temperature of the drum at 50°C, and rotate for 10 minutes; add 1.0% dyeing auxiliary (INVADERM AL, De Ruipi Chemical Co., Ltd.), rotate for 20 minutes; add 2.0-6.0% dye, rotate for 2-30 minutes; add 1.0-4.0% formic acid, rotate for 2-30 minutes, drain, wash with water, and remove from the drum.

[0029] Drying and finishing: let it stand for 24 hours → squeeze out water and stretch → vacuum drying (40℃, 300s) → hang to dry → dry → regain moisture → let it stand → oscillate and soften (level 5-6).

[0030] Fleece: Perform 2-5 fleece operations according to conventional processes to accurately grasp the inner fibers of the leather.

[0031] The amount of chemical materials used in the above-mentioned rewetting, retanning, neutralization, fatliquoring and coloring processes is measured based on the weight of the wet blue leather after shaving. For example, if the wet blue leather weighs 100 kg after shaving, then 100% water is 100 kg water.

[0032] The above is only a specific implementation of the present invention, but the design concept of the present invention is not limited thereto. 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 method for preparing an innovative grass-frost leather, characterized in that: The process includes the following steps: rewetting → retanning → neutralization → fatliquoring → color matching → drying and finishing → fleece; The color matching process comprises adding 100%-150% water and 0.5%-1.0% formic acid into a rotating drum, controlling the temperature inside the drum to 50°C, and rotating the drum for 10 minutes; adding 0.5%-1.0% dyeing auxiliary agent, and rotating the drum for 20 minutes; adding 2.0%-6.0% dye, and rotating the drum for 2-30 minutes; adding 1.0%-4.0% formic acid, and rotating the drum for 2-30 minutes, draining the liquid, washing with water, and removing the drum; The fleece grabbing process is as follows: 2-5 fleece grabbing operations are performed according to conventional processes to accurately grab the inner layer fibers of the leather.

2. The method for preparing the innovative grass-frost leather according to claim 1, characterized in that: The rewetting process comprises: placing the shaved wet blue leather into a drum, adding 100%-150% water, 0.3%-0.6% surfactant, and 1.0%-2% ammonium sulfate into the drum, controlling the inner temperature of the drum at 30°C, and rotating the drum for 240 minutes; adding 0.5%-1.0% oxalic acid, and rotating the drum for 30 minutes; draining the liquid, and washing with water.

3. The method for preparing the innovative grass-frost leather according to claim 1, characterized in that: The retanning process comprises the following steps: adding 100%-150% water and 0.3%-0.6% formic acid into a drum, controlling the inner temperature of the drum to 30°C, and rotating the drum for 10 minutes; adding 8.0%-10.0% chromium powder, and rotating the drum for 120 minutes; adding 1.0%-1.5% sodium formate, and rotating the drum for 30 minutes; adding 2.0%-2.2% baking soda in three times, rotating the drum for 20 minutes each time, and then rotating the drum for 60 minutes, stopping the drum overnight, and draining the drum after rotating the drum for 20 minutes the next morning.

4. The method for preparing the innovative grass-frost leather according to claim 1, characterized in that: The neutralization: add 100% water, 1.0%-3.0% sodium formate, 1.0%-2.0% sodium bicarbonate, 1.0%-2.0% neutralizer, 1.0%-2.0% ammonium carbonate into the drum, control the inner temperature of the drum to 30°C, and rotate for 30 minutes; Add 1.0%-1.2% baking soda, rotate for 50 minutes, drain and wash with water.

5. The method for preparing the innovative grass-frost leather according to claim 1, characterized in that: The fatliquoring method comprises the following steps: adding 50%-100% water, 1.0%-3.0% phospholipid, 1.0%-3.0% sulfonated oil, 1.0%-2.0% synthetic fatliquor, 1.0%-2.0% synthetic fatliquor, 1.0%-2.0% electrolyte-resistant oil, 1.0%-2.0% neat's foot oil into a rotary drum, controlling the inner temperature of the rotary drum to 50°C, and rotating the drum for 60 minutes; adding 1.0%-2.0% polymer retanning agent, rotating the drum for 30 minutes, adding 1.0%-2.0% formic acid twice, and rotating the drum for 20 minutes each time; adding 0.8%-1.0% formic acid, rotating the drum for 20 minutes, and draining the liquid.

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