TRIMING-based wet dyeing and finishing simplified process for cattle instep leather

Abstract

The invention relates to a simplified wet dyeing and finishing process for cattle instep leather based on TRIMMING. The simplified wet dyeing and finishing process comprises the following steps of rewetting, retanning, neutralizing, filling, dyeing, fat liquoring and one bath, color register and drying and finishing. According to the filling-dyeing-fat liquoring one-bath process, water, a synthetic fat liquoring agent, a multifunctional leather additive, a polymer filler, an acrylic acid filler and a synthetic fat liquoring agent are added into a rotary drum; adding melamine resin, quebracho tannin extract, a synthetic tanning agent, dicyandiamide resin, negundo chastetree extract and full tannin to synthesize a retanning agent; a dye, which is added with a polymer filler; 100% of water at the temperature of 50 DEG C, a synthetic fatting agent, cattle hoof oil, phospholipid, light-resistant synthetic oil and a modified biochemical polymer are added. By optimizing a chemical material formula, 30% of retanning agent materials are successfully reduced, and the production cost and the environmental influence are reduced; the physical and chemical performance indexes of the product completely meet the standard requirements of QB / T 1873-2010 leather for vamps.

Description

Technical Field

[0001] The invention relates to the technical field of leather manufacturing, in particular to a simplified wet dyeing and finishing process of cow upper leather based on TRIMMING. Background Art

[0002] With the development of world industry, the refinement and high-end production of products have become inevitable for social development. Leather product manufacturing has been divided into several leather manufacturing and commodity manufacturing processes from raw leather to final goods, and has undergone very complex chemical treatment and mechanical processing. Due to the irregularity of salted wet leather, there are significant differences in the production process of different types of leather. In the actual production process, each process not only operates independently, but is also closely connected with the previous and next processes, forming a closely connected process chain. Any mistake in any link may have a serious negative impact on the quality of subsequent processes and even the final finished leather.

[0003] With the continuous evolution of leather making process and technological innovation, the types of leather chemical materials are becoming increasingly rich and diverse. However, in recent years, affected by the global economic situation and the supply and demand relationship of the chemical industry, many chemical industry giants have announced price increases for some chemicals, which directly led to the continuous increase in the cost of leather chemical raw materials.

[0004] In the current severe market situation, leather enterprises are facing multiple challenges such as rising production costs, import and export trade barriers, and abnormally rising international transportation costs. In order to maintain profitability under this background, cost control has become a core issue for leather enterprises.

[0005] In view of this, this technology, through in-depth research on market trends, adopts the TRIMMING (cutting) method [refer to the review of research progress of TRIZ cutting method, Computer Integrated Manufacturing Systems, 2024, 30 (07)] while ensuring the performance of finished leather. By cutting and optimizing the processes and chemical materials in the wet dyeing and finishing section of leather making, it aims to simplify the process flow and reduce the use of chemical materials, thereby developing a complete simplified process technology for wet dyeing and finishing of cow upper leather. Summary of the invention

[0006] The invention provides a simplified wet dyeing and finishing process of cow upper leather based on TRIMMING, so as to overcome the problems faced by existing leather enterprises such as rising production costs, import and export trade barriers and abnormal increase in international transportation costs.

[0007] The present invention adopts the following technical solution:

[0008] A simplified wet dyeing and finishing process for cow upper leather based on TRIMMING, comprising the following steps: rewetting → retanning → neutralization → filling-dyeing-fatting in one bath → color matching → drying and finishing; based on the weight of wet blue leather, wherein:

[0009] The filling-dyeing-fatting process is as follows: add 50-60% water, 1.0% synthetic fatliquor, and 10.0-20.0% multifunctional leather auxiliary agent into a rotating drum, and rotate for 20 minutes; add 3.0-5.0% polymer filler, 3.0-5.0% acrylic filler, and 1.0-2.0% synthetic fatliquor, and rotate for 90-120 minutes; add 4.0-6.0% melamine resin, 1.0-2.0% quebracho tannin, 2.0-4.0% synthetic tannin, 1.0-3.0% melamine resin, 1.0-2.0% wattle bark tannin, and 1.0-2.0% full tannin. %, synthetic retanning agent 1.0-2.0%, rotate for 30 minutes; add dye 1.0-2.0%, rotate for 30 minutes; add polymer filler 1.0-2.0%, rotate for 30 minutes; add 50℃ water 100%, synthetic fatliquor 2.0-4.0%, neat's foot oil 1.0-2.0%, phospholipid 1.0-2.0%, light-resistant synthetic oil 1.0-2.0%, modified biochemical polymer 1.0-2.0%, rotate for 60 minutes; add formic acid 1.0-3.0% three times, rotate for 20 minutes each time, adjust pH to 3.4-3.6, drain, wash with water, and remove from the drum.

[0010] Furthermore, the above rewetting is carried out according to conventional processes, the shaved wet blue leather is placed in a drum, 200-300% water, 0.1-0.3% surfactant, 1.0-2.0% oxalic acid, 0.3-0.6% nitrogen-free deashing aid, 0.5-1.0% fatliquor are added to the drum, the temperature is 40°C, the drum is rotated for 60-90 minutes, the pH of the bath liquid is adjusted to ≤3.0, the liquid is drained, and the drum is washed with water.

[0011] Furthermore, the above-mentioned retanning is carried out according to conventional processes, 150-300% of water and 1.5-3.0% of modified light-resistant aldehyde tanning agent are added to the drum, the temperature is 30°C, and the drum is rotated for 20 minutes; 3.0-5.0% of chromium powder, 3.0-5.0% of chromium-containing tannin, 1.0-2.0% of protein filler, and 1.0-2.0% of electrolytic resistant grease are added, and the drum is rotated for 60 minutes; 1.5-2.0% of sodium formate is added, and the drum is rotated for 20 minutes; 1.0-2.0% of baking soda is added, and the drum is rotated for 60 minutes, and the pH of the bath liquid is adjusted to 4.0±0.1, the drum is stopped overnight, and the drum is rotated for 20 minutes the next morning before draining the liquid and washing with water.

[0012] Furthermore, the above drying and finishing is carried out according to conventional processes, with the steps of standing for 12 hours → squeezing water and stretching → vacuum drying (40°C, 300s) → hanging to dry → drying → moisture regaining → standing → oscillation and softening (level 5-6).

[0013] 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:

[0014] 1. Compared with the traditional leather making process, the simplified process technology of wet dyeing and finishing of cow upper leather in the present application significantly simplifies the process, and performs filling, dyeing and greasing in the same bath, that is, simplifies the filling, dyeing and greasing process into a filling-dyeing-greasing in the same bath process, thereby realizing the simplification and innovation of the process; at the same time, the technology successfully omits the neutralization process and the color matching process, as well as the necessary washing steps between these processes, which not only simplifies the production process, but also shortens the leather making time.

[0015] 2. The present application introduces a multifunctional leather auxiliary agent in the filling-dyeing-fatting process, which is a new type of polymer material. The auxiliary agent is a mixture of amphoteric polymers, and its main components include polyester compounds, acrylic acid (ester), polyhydroxy esters, amino compounds, etc. This auxiliary agent can meet the wet dyeing and finishing processing requirements of finished leather, and can effectively replace part of the retanning agent and filler, thereby reducing the amount of wet dyeing and finishing chemical materials. In addition, because its main component is a mixture of amphoteric polymers, it is not restricted by anionic and cationic materials when used, and can be combined with existing leather making process materials as needed, and related materials can be flexibly added.

[0016] 3. In the process of optimizing the process, this application significantly reduces the use of chemical materials such as sodium formate, baking soda and fatliquor, so as to reduce the chemical load in the production process and improve cost-effectiveness.

[0017] 4. The streamlined process of this application shortens the wet dyeing and finishing time by 30%, achieving a significant reduction in resource consumption. According to statistics, water consumption has been reduced by 50% and electricity consumption has been reduced by 30%. This improvement not only demonstrates the production concept of environmental protection and energy saving, but also effectively shortens the production time, further helps enterprises reduce production costs and improve production efficiency, thereby gaining an advantage in the fierce market competition.

[0018] 5. This application successfully reduces the use of retanning agent materials by 30% by optimizing the chemical material formula, further reducing production costs and environmental impact; the physical and chemical performance indicators of the product are fully in line with the standard requirements of QB / T1873-2010 "Leather for Shoe Uppers". DETAILED DESCRIPTION

[0019] Embodiment 1:

[0020] A simplified wet dyeing and finishing process for cow upper leather based on TRIMMING, comprising the following steps: rewetting → retanning → neutralization → filling-dyeing-fatliquorification in one bath → color matching → drying and finishing; based on the weight of wet blue leather,

[0021] Rewetting: according to the conventional process, the shaved wet blue leather is placed in a drum, and 300% water, 0.3% surfactant (BORRON SAF, Deruipi Chemical Co., Ltd.), 1.0% oxalic acid, 0.3% nitrogen-free deashing auxiliary (BLANCOROL CGA-C, LANXESS Company), 0.5% fatliquor (TRUPON OSL, Tang Pule Chemical Dye (Jiaxing) Co., Ltd.) are added into the drum. The temperature is 40°C, and the rotation is performed for 60-90 minutes. The pH value of the bath liquid is adjusted to ≤3.0, the liquid is drained, and the drum is washed with water.

[0022] Retanning: according to the conventional process, 150% of water and 1.5% of modified light-resistant aldehyde tanning agent (NOVALTAN PF, Sima Chemical (China) Co., Ltd.) were added to the drum, the temperature was 30°C, and the drum was rotated for 20 minutes; 3.0% of chromium powder (Brother Technology Co., Ltd.), 3.0% of chromium-containing tannin (BITAN BO, UNITEK), 2.0% of protein filler (DESOATEN FB, Sichuan Desail New Material Technology Co., Ltd.), and 1.0% of electrolytic resistant grease (COTR B1, Jinjiang Qiangde Material Trading Co., Ltd.) were added, and the drum was rotated for 60 minutes; 1.5% of sodium formate was added, and the drum was rotated for 20 minutes; 1.0% of baking soda was added, and the drum was rotated for 60 minutes, and the pH of the bath liquid was adjusted to 4.0±0.1, the drum was stopped overnight, and the drum was rotated for 20 minutes the next morning before draining the liquid and washing with water.

[0023] Filling-dyeing-fatting process: add 50% water, 1.0% synthetic fatliquor (Leaningsof DF22, Shandong Li Ning Technology New Materials Co., Ltd.), 10.0-20.0% multifunctional leather auxiliary agent (JKF / JKS, Shanghai Leather Industry Research Institute) to the drum, rotate for 20 minutes; add 3.0% polymer filler (BATAN XYR-007L, LETEX Company), 3.0% acrylic filler (XPR, Sichuan Tingjiang New Materials Co., Ltd.), 1.0% synthetic fatliquor, rotate for 90-120 minutes; add 4.0% melamine resin (TRUPOTAN HB, Temple Chemical Dye (Jiaxing) Co., Ltd.), 2.0% quebracho tannin (UNITANATO, UNITAN Company), 4.0% synthetic tanning agent (TANIGAN OS, LANXESS Company), 3.0% melamine resin (BITANR19, UNITEK Company), 3.0% wattle bark tannin (MIMOSA ME, MIMOSA) 2.0%, full tannin (LECORENM-AR, FGL) 2.0%, synthetic retanning agent (BLX 14468, BUCKMAN) 2.0%, rotate for 30 minutes; add dye (black D (Leyou Company)) 1.0%, rotate for 30 minutes; add polymer filler (Batan XYR-008L, LETEX) 1.0%, rotate for 30 minutes; add 50°C water 100%, synthetic fatliquor 2.0%, neat's foot oil (BIOTOIL CK, UNITEK) 2.0%, lecithin (PROVOL BA, Sima Chemical (China) Co., Ltd.) 2.0%, light-resistant synthetic oil (TANINOIL BQ, Chengdu Pengzhou Mingzhong Chemical Co., Ltd.) 2.0%, modified biochemical polymer (TRUPOTAN BIO-03L, Tompler Chemical Dye (Jiaxing) Co., Ltd.) 1.0%, rotate for 60 min; add formic acid 3.0% three times, rotate for 20 min each time, adjust pH = 3.4-3.6, drain, wash with water, and remove from the drum.

[0024] Drying and finishing: follow the conventional process, let it stand for 12 hours → squeeze water and stretch → vacuum drying (40℃, 300s) → hang to dry → dry → regain moisture → let it stand → oscillate and soften (level 5-6).

[0025] Embodiment 2:

[0026] A simplified wet dyeing and finishing process for cow upper leather based on TRIMMING, comprising the following steps: rewetting → retanning → neutralization → filling-dyeing-fatliquorification in one bath → color matching → drying and finishing; wherein,

[0027] The above rewetting is carried out according to conventional processes, the shaved wet blue leather is placed in a drum, 200% water, 0.1% surfactant, 2.0% oxalic acid, 0.6% nitrogen-free deashing aid, 1.0% fatliquor are added to the drum, the temperature is 40°C, the drum is rotated for 60-90 minutes, the pH of the bath liquid is adjusted to ≤3.0, the liquid is drained, and the drum is washed with water.

[0028] The above-mentioned retanning is carried out according to conventional processes, 300% water and 1.5% modified light-resistant aldehyde tanning agent are added to the drum, the temperature is 30°C, and the drum is rotated for 20 minutes; 5.0% chromium powder, 5.0% chromium-containing tannin, 2.0% protein filler, and 2.0% electrolytic resistant grease are added, and the drum is rotated for 60 minutes; 2.0% sodium formate is added, and the drum is rotated for 20 minutes; 2.0% baking soda is added, and the drum is rotated for 60 minutes, and the pH of the bath liquid is adjusted to 4.0±, the drum is stopped overnight, and the drum is rotated for 20 minutes the next morning, and then the liquid is drained and washed with water.

[0029] The above-mentioned filling-dyeing-fatting process in one bath: add 60% water, 1.0% synthetic fatliquor, 10.0-20.0% multifunctional leather auxiliary agent into the drum, rotate for 20 minutes; add 5.0% polymer filler, 5.0% acrylic filler, 2.0% synthetic fatliquor, rotate for 90-120 minutes; add 6.0% melamine resin, 1.0-2.0% quebracho tannin, 2.0-4.0% synthetic tanning agent, 1.0-3.0% melamine resin, 1.0-2.0% wattle bark tannin, 2.0% full tannin, 2.0% synthetic retanning agent, rotate for 30 minutes; add 1.0% dye, rotate for 30 minutes; add 1.0% polymer filler, rotate for 30 minutes; add 100% water at 50℃, 2.0% synthetic fatliquor, 1.0% neat's foot oil, 1.0% phospholipid, 2.0% light-resistant synthetic oil, 1.0% modified biochemical polymer, rotate for 60 minutes; add 3.0% formic acid three times, rotate for 20 minutes each time, adjust pH to 3.4-3.6, drain, wash with water, and remove from the drum.

[0030] The above drying and finishing: carry out according to the conventional process, let it stand for 12 hours → squeeze water and stretch → vacuum drying (40℃, 300s) → hang to dry → dry → regain moisture → stand → oscillate and soften (5-6 levels).

[0031] The cow upper leather obtained in Example 1 was tested as follows:

[0032] Table 1 Process comparison table

[0033]

[0034]

[0035] Table 2 Comparison of Crust Leather Performance

[0036]

[0037] It can be seen from Tables 1 and 2 above that the physical and chemical performance indicators of the products of the present application are fully in line with the standard requirements of QB / T 1873-2010 "Leather for Shoe Uppers".

[0038] 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 simplified wet dyeing and finishing process for cow upper leather based on TRIMMING, characterized in that: The process includes the following steps: rewetting → retanning → neutralization → filling-dyeing-fatliquoring in one bath → color matching → drying and finishing; The filling-dyeing-fatting process comprises the following steps: adding 50-60% water, 1.0% synthetic fatliquor and 10.0-20.0% multifunctional leather auxiliary agent into a rotating drum, and rotating the drum for 20 minutes; adding 3.0-5.0% polymer filler, 3.0-5.0% acrylic filler and 1.0-2.0% synthetic fatliquor and rotating the drum for 90-120 minutes; adding 4.0-6.0% melamine resin, 1.0-2.0% quebracho tannin, 2.0-4.0% synthetic tannin, 1.0-3.0% melamine resin, 1.0-2.0% wattle bark tannin and 1.0-2.0% full tannin. %, synthetic retanning agent 1.0-2.0%, rotate for 30 minutes; add dye 1.0-2.0%, rotate for 30 minutes; add polymer filler 1.0-2.0%, rotate for 30 minutes; add 50℃ water 100%, synthetic fatliquor 2.0-4.0%, neat's foot oil 1.0-2.0%, phospholipid 1.0-2.0%, light-resistant synthetic oil 1.0-2.0%, modified biochemical polymer 1.0-2.0%, rotate for 60 minutes; add formic acid 1.0-3.0% three times, rotate for 20 minutes each time, adjust pH to 3.4-3.6, drain, wash with water, and remove from the drum.

2. A simplified process for wet dyeing and finishing of cow upper leather based on TRIMMING as claimed in claim 1, characterized in that: The rewetting is carried out according to conventional processes, the shaved wet blue leather is put into a drum, 200-300% water, 0.1-0.3% surfactant, 1.0-2.0% oxalic acid, 0.3-0.6% nitrogen-free deashing aid, 0.5-1.0% fatliquor are added into the drum, the temperature is 40°C, the drum is rotated for 60-90 minutes, the pH value of the bath liquid is adjusted to ≤3.0, the liquid is drained, and the drum is washed with water.

3. The simplified wet dyeing and finishing process of cow upper leather based on TRIMMING as claimed in claim 1, characterized in that: The retanning is carried out according to conventional processes, 150-300% of water and 1.5-3.0% of modified light-resistant aldehyde tanning agent are added into a rotating drum, the temperature is 30°C, and the drum is rotated for 20 minutes; 3.0-5.0% of chromium powder, 3.0-5.0% of chromium-containing tannin, 1.0-2.0% of protein filler, and 1.0-2.0% of electrolytic resistant grease are added, and the drum is rotated for 60 minutes; 1.5-2.0% of sodium formate is added, and the drum is rotated for 20 minutes; 1.0-2.0% of baking soda is added, and the drum is rotated for 60 minutes, the pH value of the bath liquid is adjusted to 4.0±0.1, the drum is stopped overnight, and the drum is rotated for 20 minutes the next morning before the liquid is drained and washed with water.

4. The simplified wet dyeing and finishing process of cow upper leather based on TRIMMING as claimed in claim 1, characterized in that: The drying and finishing is carried out according to the conventional process, and the steps are as follows: placing the cloth on a horse and letting it stand for 12 hours → squeezing water and stretching → vacuum drying → hanging and air drying → drying → moisture regaining → letting it stand → oscillating and softening.

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