CN110982959B - Manufacturing method of high-value secondary top-dyeing buffed leather - Google Patents
Manufacturing method of high-value secondary top-dyeing buffed leather Download PDFInfo
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- CN110982959B CN110982959B CN201911298493.0A CN201911298493A CN110982959B CN 110982959 B CN110982959 B CN 110982959B CN 201911298493 A CN201911298493 A CN 201911298493A CN 110982959 B CN110982959 B CN 110982959B
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
- C14C3/10—Vegetable tanning
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
- C14C3/22—Chemical tanning by organic agents using polymerisation products
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/28—Multi-step processes
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
- C14C9/02—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes using fatty or oily materials, e.g. fat liquoring
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/34—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using natural dyestuffs
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/445—Use of auxiliary substances before, during or after dyeing or printing
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- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/52—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing synthetic macromolecular substances
- D06P1/5207—Macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- D06P1/525—Polymers of unsaturated carboxylic acids or functional derivatives thereof
- D06P1/5257—(Meth)acrylic acid
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/651—Compounds without nitrogen
- D06P1/65106—Oxygen-containing compounds
- D06P1/65125—Compounds containing ester groups
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/02—Material containing basic nitrogen
- D06P3/04—Material containing basic nitrogen containing amide groups
- D06P3/32—Material containing basic nitrogen containing amide groups leather skins
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Abstract
The invention discloses a manufacturing method of high-value secondary over-dyeing buffed leather, which comprises a material preparation process, a retanning process, a neutralization process, a filling and dyeing process, a fatliquoring and re-dyeing process, a primary drying process, a leather buffing process, a secondary chromatography process and the like which are sequentially carried out. Compared with the prior art, the method utilizes a secondary counter dyeing technology, replaces the conventional chromium powder with the environment-friendly aldehyde tanning agent and the environment-friendly synthetic tanning agent for tanning, supplements the tanning agent with the natural plant tanning agent as the environment-friendly filler, fills and covers the filler, improves the smoothness and the embossing property of the leather surface in a multi-level, high-dimensional and all-around manner, solves the problem between the tanning and the ecological development of the low-grade raw material leather, successfully upgrades and manufactures the low-grade raw material leather into the environment-friendly leather product with high added value, realizes the high-efficiency utilization of resources, and obviously improves the added value of the low-grade raw material leather and the utilization rate of the finished leather.
Description
Technical Field
The invention relates to a method for manufacturing leather, in particular to a method for manufacturing high-value secondary top-dyeing buffed leather.
Background
With the continuous improvement of the consumption level, the requirements of people on leather products are continuously upgraded, the wearing comfort is met, and meanwhile, the products are required to be fashionable, beautiful and high-end, so that the quality of the leather products is promoted to be developed to a higher level. The main problems puzzling the leather production at present are that the defects of low-grade raw leather are too many, the defects can only be compensated by recoating in the traditional process, some middle and low-end products are produced, the market requirements cannot be met, the recoating raw materials are toxic and harmful and are not beneficial to body health, and in addition, the scientific development and ecological integration between the traditional process and resource utilization and environmental protection cannot be realized due to the fact that the traditional process is mostly tanned by chromium powder, and the sustainable development of enterprises is not facilitated. Therefore, there is a need to find a resource utilization, scientific and ecological tanning method.
Disclosure of Invention
In view of the above, the invention aims to provide a method for manufacturing high-value secondary top-dyeing buffed leather, which solves the problem between leather making by using low-grade raw materials and ecological development.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for manufacturing high-value secondary over-dyeing buffed leather comprises the steps of material preparation, retanning, neutralization, filling and dyeing, fatliquoring and re-dyeing, primary drying, leather buffing, secondary over-dyeing and secondary drying in sequence,
in the retanning procedure, an environment-friendly aldehyde tanning agent and an environment-friendly synthetic tanning agent are used;
in the filling and dyeing process, firstly, adding a filling agent, rotating for a certain time, then adding a dye, and carrying out primary dyeing, wherein a pure natural plant tanning agent is used as the filling agent, and an acrylic resin retanning agent is used in combination;
during the process of the fatliquoring and dyeing process, firstly adding the fatliquoring agent, rotating for a certain time, then adding the dye for primary after-dyeing, after primary after-dyeing, sequentially performing a primary drying process and a leather grinding process, then returning to the drum for secondary chromatography, during the secondary chromatography, firstly adding the dye, then rotating for a certain time, then adding the cationic fixing agent aluminum tannin, rotating, and performing secondary chromatography.
After the technical scheme is adopted, the manufacturing method of the high-value secondary top-dyeing buffed leather has the following beneficial effects: by utilizing a secondary over dyeing technology, the conventional chromium powder is tanned by using an environment-friendly aldehyde tanning agent and an environment-friendly synthetic tanning agent at the same time, the tanning agent is supplemented by using a natural plant tanning agent as an environment-friendly filler, the filling and covering are carried out, the smoothness and the embossing property of the leather surface are improved in a multi-level, high-dimensional and all-round manner, and the problem of solving the problem of low cost is solvedThe problem between the leather making of the low-grade raw leather and the ecological development is that the low-grade raw leather is successfully upgraded and manufactured into an environment-friendly leather product with a high added value, so that the high-efficiency utilization of resources is realized, and the added value and the leather forming utilization rate of the low-grade raw leather are obviously improved. The finished leather has more colorful and full color, not only saves energy and reduces consumption and reduces production cost, but also greatly improves the physical properties and the setting property of the leather embryo, such as bursting strength, coating folding fastness and the like, and the bursting strength is originally 31kg/cm2Increased to 40kg/cm2The flexibility resistance of the coating can reach 12 ten thousand times of bending without cracks under the condition of-15 ℃, and the coating does not wear through at 500 turns. The utilization rate of the finished leather manufactured by the invention is up to more than 80%, and various indexes such as softness, tearing strength, bursting strength, friction color fastness and the like of the finished leather can meet the requirements of leather for high-grade vamps, the tearing strength reaches 4.3kg, the friction color fastness reaches 2 grades, the finished leather has natural, comfortable and moist appearance, good hand feeling, bright color, strong real leather feeling and excellent air permeability, and the added value of a frosted product is greatly improved.
Preferably, in the secondary color registering process, by taking the weight of the leather blank as a reference, 500% hot water is added into a rotary drum, the temperature in the rotary drum reaches 55 ℃, then 0.3% of a rewetting and degreasing agent SAF is added, 1% of a fatliquoring agent GLH is added, the rotary drum is stopped for 5-7h after rotating for 60 minutes, then the rotary drum is continued for 30 minutes, water is drained, water washing is carried out, 500% of water is added, the temperature in the rotary drum reaches 60 ℃, a dye is added, the rotary drum is rotated for 20 minutes, 1% of grease RUN and 0.5% of raw oil COS are added, the rotary drum is rotated for 30 minutes, 1% of formic acid is added, the rotary drum is rotated for 30 minutes, 1% of cationic fixative aluminum tannin ALL is added, the rotary drum is rotated for 20 minutes, and water is drained.
Preferably, in one-time after-dyeing, by taking the weight of the leather blank as a reference, firstly adding 200% of hot water to enable the temperature in the rotary drum to reach 50-52 ℃, then adding 2% of grease RUN, 2% of fatting agent 2012, 2% of fatting agent Tis and 2% of fatting agent BA, rotating for 60 minutes, adding the dye again, rotating for 50 minutes, adding 2% of formic acid after the color is detected to be qualified, adding the formic acid for three times at intervals of 20 minutes, finally washing with water, cooling, taking out the drum, and standing.
Preferably, in the filling and dyeing process, the pure natural plant tanning agents comprise wattle bark tannin extract FS, quebracho tannin extract ATO and modified areca tannin extract GMB, and the acrylic resin retanning agent adopts acrylic resin high-efficiency retanning agent 3315 produced by Basca chemical company Limited and acrylic resin retanning agent R83 produced by Toepler chemical company Limited.
After the technical scheme is adopted, the manufacturing method of the high-value secondary top-dyeing buffed leather has the following beneficial effects: the retanning agent can continuously disperse collagen fibers in the retanning, neutralizing and fatliquoring process and promote the full permeation, combination and absorption of other chemical materials, has the advantages of environmental protection, strong selective filling property, flat and fine finished leather grain surface and good fullness, and can effectively reduce the chemical material concentration of bath solution, thereby realizing the cyclic utilization of the waste water of the retanning process.
Preferably, the environment-friendly aldehyde tanning agent is an aldehyde tanning agent PF produced by German Simma chemical industry Co., Ltd, the environment-friendly synthetic tanning agent is a synthetic tanning agent HN produced by German Derui, and in the retanning process, the synthetic tanning agent HN is used as a retanning agent and is matched with a fatty aldehyde tanning agent PF and a fatliquoring agent GLH for retanning.
After the technical scheme is adopted, the manufacturing method of the high-value secondary top-dyeing buffed leather has the following beneficial effects: in the retanning process, chromium powder is replaced by an environment-friendly aldehyde tanning agent PF produced by German Mingming company and an environment-friendly synthetic tanning agent HN produced by German Delui company, and fatty aldehyde PF promoting penetration and absorption of chemicals and a fatting agent GLH with good oil-lubricated feeling are used in cooperation, so that the concentration of residual trivalent chromium in retanning waste liquid is greatly reduced, the pollutant discharge is remarkably reduced, clean production is realized, the added value and the foam feeling of the product are remarkably improved, the fatting agent GLH can more fully fill collagen fibers, the leather has stronger oil-lubricated feeling, and the finished leather has the advantages of good softness, high leather yield and lubricated hand feeling.
Preferably, in the retanning process, 1% of oxalic acid, 0.3% of formic acid, 0.5% of a moisture returning agent MPC and 0.3% of a degreasing agent SAF are added into water with the liquid ratio of 200% in a rotary drum and the temperature of 40 ℃ for 120 minutes, the moisture returning degree is checked to ensure that the moisture returning is fully and thoroughly returned, the pH value is required to be 3-3.3, the water is drained and washed for 10 minutes, the water is drained, 150% of water is added, the temperature of 35 ℃, 2% of a fatty aldehyde tanning agent PF and 2% of a fatliquoring agent GLH are added for 30 minutes, 3% of the retanning agent HN is added for 60 minutes, 1.5% of sodium formate and 0.5% of baking soda are added for 30 minutes, 0.5% of baking soda is added for 60 minutes, the pH value is checked to be 4-4.2, and the rotary drum is stopped for 5-7 hours.
Preferably, in the neutralization process, 2 percent of neutralization tannin PAK-S and 1.5 percent of sodium formate are added into water with the liquid ratio of 150 percent in a rotary drum and the temperature of 35 ℃ for 30 minutes, then 2 percent of baking soda is added for 90 minutes, the neutralization degree is detected, the mixture is completely permeated, the pH value is 5.5-5.8, the mixture is washed for 10 minutes, and then water drainage and washing are carried out.
Preferably, in the leather grinding process, the leather embryos are strictly sorted according to the defective types and the defective degrees of the leather embryos, and then the sorted leather embryos are subjected to personalized leather grinding.
After the technical scheme is adopted, the manufacturing method of the high-value secondary top-dyeing buffed leather has the following beneficial effects: the leather buffing procedure of the invention improves the traditional leather buffing mode, adopts classification leather buffing, and combines different leather buffing modes such as point buffing, local buffing, secondary buffing, full body buffing and the like aiming at different disabilities so as to achieve the best modification effect.
Drawings
FIG. 1 is a diagram of a selected path of a buffing mode in the present invention.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following specific examples.
The invention relates to a manufacturing method of high-value secondary over-dyeing buffed leather, which comprises the steps of material preparation, retanning, neutralization, filling and dyeing, fatliquoring and re-dyeing, acid fixation, primary drying, buffing, secondary chromatography, secondary drying, surface finishing and the like which are sequentially carried out. The material preparation process (including the steps of material preparation, water squeezing, shaving, weighing and the like), the acid fixing process, the primary drying process, the secondary drying process and the surface coating process are all conventional processes, and the conventional operations known in the industry are adopted, so that the detailed description is omitted.
In the retanning procedure, an environment-friendly aldehyde tanning agent and an environment-friendly synthetic tanning agent are used;
in the filling and dyeing process, firstly, adding a filling agent, rotating for a certain time, then adding a dye, and carrying out primary dyeing, wherein a pure natural plant tanning agent is used as the filling agent, and an acrylic resin retanning agent is used for retanning and filling;
during the process of the fatliquoring and dyeing process, firstly adding the fatliquoring agent, rotating for a certain time, then adding the dye for primary after-dyeing, after primary after-dyeing, sequentially performing a primary drying process and a leather grinding process, then returning to the drum for secondary chromatography, during the secondary chromatography, firstly adding the dye, then rotating for a certain time, then adding the cationic fixing agent aluminum tannin, rotating, and performing secondary chromatography.
In a preferred embodiment, the raw materials are added by taking the weight of the leather embryo as a reference, 200% of hot water (considered as water higher than normal temperature) is added in one dyeing process, so that the inner temperature of the drum reaches 50-52 ℃, then 2% of grease RUN (produced by Ringjiang Lijing trade Co., Ltd.) is added, 2% of fatting agent 2012 (produced by Thailand United chemical Co., Ltd.), 2% of fatting agent Tis (produced by Ringjiang Lijing trade Co., Ltd.) is added, 2% of fatting agent BA (produced by Germany Stema chemical Co., Ltd., Jinfeng trade leather Co., Ltd.) is rotated for 60 minutes, the dye is added again and rotated for 50 minutes, 2% of formic acid (mass concentration of 85% -92%) is added after the color is qualified, the formic acid is added in three times, each time is 20 minutes, finally, washing with water, cooling, taking out the drum, and standing.
In the invention, the dyeing is carried out once firstly and once later to form complete one-time dyeing, namely, the dye for one-time dyeing is added step by step. And returning to the drum for secondary color register after primary dyeing.
As a preferred embodiment, the leather blank dyed after the primary dyeing is dried once, vacuum drying is adopted, the dried leather blank is ground and then re-rolled to perform secondary color registering, in the secondary color registering process, 500% hot water is added into the rotary drum by taking the weight of the leather blank as reference, the temperature in the rotary drum is 55 ℃, then 0.3% rewetting and degreasing agent SAF (produced by Delry company and supplied by Jinfeng leather trade Co., Ltd.) is added, 1% fatting agent GLH (produced by Strength chemical engineering Co., Ltd., Jinjiang Lijing Co., Ltd.) is rotated for 60 minutes, then the rotary drum is stopped for over night (in favor of production arrangement), namely the rotary drum stop time is about 5-7h, the rotary drum is continued for 30 minutes the next day, then water is drained, after water washing, 500% hot water is added, the temperature in the rotary drum is made to 60 ℃, the dye is rotated for 20 minutes, 1% grease RUN and 0.5% raw oil COS (produced by Shandong Ningjing chemical engineering Co., Ltd.) are added, rotating for 30 minutes, adding 1% formic acid, rotating for 30 minutes, adding 1% aluminum tannin ALL (supplied by Fufeng leather trade company Limited in Jinjiang City), rotating for 20 minutes, draining, repeating the above operations and performing chromatography once again to ensure that the dyeing color is more bright and full.
TABLE 1 comparison of Process conditions for Primary after-dyeing and Secondary chromatography
As a preferred embodiment, in the filling and dyeing process, the pure natural plant tanning agents include wattle extract FS (supplied by yujiang yunit trade co., ltd.), quebracho extract ATO (supplied by yujiang yunit trade co., ltd.), and modified betel palm extract GMB (supplied by dada mond trade co., ltd.), and the acrylic resin retanning agents include acrylic resin high-efficiency retanning agent 3315 manufactured by basca chemical ltd and acrylic resin retanning agent R83 manufactured by thopler chemical ltd.
Specifically, in water with a liquid ratio of 80% and a temperature of 35 ℃, 2% of acrylic resin retanning agent R83, 1.0-2% of acrylic resin retanning agent 3315 and 1% of grease BA are added, the mixture is rotated for 60 minutes, then 2% of wattle extract FS, 3% of quebracho extract ATO, 2% of resin tanning agent RT (Langshan (tin-free) chemical company Limited), 2% of resin tannin M711 and 2% of substituted tannin OS are added, the mixture is rotated for 60 minutes, then 3% of modified areca extract GMB, 2% of retanning agent 7816 (supplied by Quanzhou, broad commercial trade company Limited), 2% of disperse tannin TM (produced by Shandong Ninghua chemical company Limited) are added, the mixture is rotated for 40 minutes, then the dye is added, the mixture is rotated for 60 minutes, the filler absorption condition and whether the dye is permeable or not are checked, if the leather surface is not compact enough, the filling material is needed to be added if the fullness is not enough, so as to achieve the purpose of approaching loose surface. The residual chemical material concentration in the improved leather is 0.8-1.2Be degrees, and compared with the residual chemical material concentration before the improvement, the residual chemical material concentration is reduced by 40 percent.
TABLE 2 comparison of fill dyeing process conditions before and after improvement
In a preferred embodiment, the environment-friendly aldehyde tanning agent is a fatty aldehyde tanning agent PF produced by german sumab chemical company ltd and supplied by kungfeng leather trade company ltd, and the environment-friendly synthetic tanning agent is a synthetic tanning agent HN produced by german derry company, and in the retanning step, the synthetic tanning agent HN is used as a retanning agent, and is used together with the fatty aldehyde tanning agent PF and the fatliquoring agent GLH for retanning.
As a preferable embodiment, in the retanning process, 1% oxalic acid, 0.3% formic acid, 0.5% rewetting agent MPC (manufactured by Simton chemical Co., Ltd.), 0.3% degreasing agent SAF (manufactured by Delauy Co., Ltd., supplied by Fukun leather trade Co., Ltd.) were added to water at a temperature of 40 ℃ in a ratio of the internal liquid of the drum to 200%, the drum was rotated for 120 minutes, the degree of rewetting was checked to ensure sufficient rewetting, pH was required to be 3-3.3, draining was performed, washing was performed for 10 minutes with water, draining was performed, 150% water was added, the internal temperature of the drum reached 35 ℃, 2% fatty aldehyde tanning agent PF was added, 2% fatting agent GLH was added, the drum was rotated for 30 minutes, 3% retanning agent HN (manufactured by Delauy Co., rotated for 60 minutes, 1.5% sodium formate was added, 0.5% baking soda was rotated for 30 minutes, 0.5% baking soda was added, and the drum was rotated for 60 minutes to check that the pH was 4-4.2, stopping the drum for 5-7h after the drum is stopped overnight.
TABLE 3 comparison of the Process conditions before and after improvement of the retanning procedure
As a preferable embodiment, in the neutralization step, 2% of the tannin PAK-S [ Langshen (tin-free) chemical Co., Ltd., from Jinfeng leather trade Co., Ltd ] and 1.5% of sodium formate are added to water at a temperature of 35 ℃ in a liquid ratio of 150% in a drum, and rotated for 30 minutes, 2% of sodium bicarbonate is added thereto and rotated for 90 minutes, and the degree of neutralization is detected to be completely permeated, pH value is 5.5-5.8, and water washing is carried out for 10 minutes, and water draining and water washing are carried out.
TABLE 4 comparison of neutralization process conditions before and after improvement
In a preferred embodiment, in the leather grinding process, the leather embryos are strictly sorted according to the damage type and degree of the leather embryos, and then the sorted leather embryos are subjected to personalized leather grinding. The disabilities and the defects are perfectly modified and covered, and the optimal appearance effect is achieved. The specific buffing mode is shown in figure 1.
According to the manufacturing method of the high-value secondary top-dyeing buffed leather, a pure natural plant tanning agent is used as an environment-friendly filler, and an acrylic resin high-efficiency retanning agent is combined, so that the method has the advantages of environmental friendliness and high selective filling property, the leather surface is more delicate after filling, and meanwhile, the chemical material concentration of bath foam can be effectively reduced, and further, the cyclic utilization of waste water in a retanning process is realized; in addition, a secondary over dyeing technology is adopted, the dye and the damaged part are deeply fused, the spraying times are reduced, and meanwhile, a cationic color fixing agent aluminum tannin which has strong cationic property can cause the deep deposition of anionic dye, so that the surface positive charge is increased, the dye-uptake rate is improved, and the dye-uptake rate is fixed. The added value of the product is greatly improved, the dust amount and the content of toxic and harmful gases generated in the operation process are obviously reduced, and the method has important significance for energy conservation, consumption reduction, environmental protection and body health and can serve multiple purposes. Compared with the traditional chromatography dyeing, which only dyes once and sprays color again, the spray gun is adopted to spray dye on the surface of the leather during color spraying, so that the dye is easily dyed only on the surface and cannot penetrate into the leather, and uniform dyeing is not easy to realize.
Optimizes the traditional process, reduces energy consumption, reduces production cost, greatly improves physical properties and setting property of the leather blank such as bursting strength and coating folding fastness while paying attention to the improvement of product performance while simplifying the traditional process, ensures that the color of the finished leather is more bright and full, saves energy, reduces consumption, and greatly improves the bursting strength of the leather blank, the coating folding fastness and the like, wherein the bursting strength is originally 31kg/cm2Increased to 40kg/cm2The flexibility resistance of the coating can reach 12 ten thousand times of bending without cracks under the condition of-15 ℃, and the coating does not wear through at 500 turns. The softness and the fullness of the leather blank are improved, and meanwhile, the using amount of the spraying chemical material is greatly reduced, clean production is favorably realized, and the body health is protected.
The utilization rate of the finished leather manufactured by the invention is up to more than 80%, and various indexes such as softness, tearing strength, bursting strength, friction color fastness and the like of the finished leather can meet the requirements of leather for high-grade vamps, the tearing strength reaches 4.3kg, the friction color fastness reaches 2 grades, the finished leather has natural, comfortable and moist appearance, good hand feeling, bright color, strong real leather feeling and excellent air permeability, and the added value of a frosted product is greatly improved.
In the respective steps of the present invention, the "liquid ratio" represents a weight ratio of the raw material shell to the liquid in the drum.
The above embodiments are not intended to limit the scope of the present invention, and any suitable changes or modifications made by those skilled in the art should be construed as not departing from the scope of the present invention.
Claims (1)
1. A manufacturing method of high-value secondary top-dyeing buffed leather is characterized by comprising the following steps: comprises a material preparation process, a retanning process, a neutralization process, a filling and dyeing process, a fatliquoring and re-dyeing process, a primary drying process, a leather grinding process, a secondary chromatography process and a secondary drying process which are sequentially carried out,
in the retanning procedure, an environment-friendly aldehyde tanning agent and an environment-friendly synthetic tanning agent are used;
in the filling and dyeing process, firstly, adding a filling agent, rotating for a certain time, then adding a dye, and carrying out primary dyeing, wherein a pure natural plant tanning agent is used as the filling agent, and an acrylic resin retanning agent is used in combination;
in the process of the fatliquoring and dyeing process, firstly adding a fatliquoring agent, rotating for a certain time, then adding a dye for primary after-dyeing, sequentially performing a primary drying process and a leather grinding process after primary after-dyeing, then performing a secondary chromatography process by returning to a drum, firstly adding the dye in the secondary chromatography process, then rotating for a certain time, then adding a cationic fixing agent aluminum tannin, rotating, and performing secondary chromatography;
in the secondary color registering process, by taking the weight of a leather blank as reference, adding 500% of hot water into a rotary drum to enable the temperature in the rotary drum to reach 55 ℃, then adding 0.3% of a moisture-regaining degreasing agent SAF, rotating 1% of a fatting agent GLH for 60 minutes, stopping the rotary drum for 5-7 hours, then continuing to rotate for 30 minutes, draining water, washing, adding 500% of water to enable the temperature in the rotary drum to reach 60 ℃, adding a dye to rotate for 20 minutes, adding 1% of grease RUN and 0.5% of raw oil COS, rotating for 30 minutes, adding 1% of formic acid, rotating for 30 minutes, adding 1% of a cation fixative aluminum tannin ALL, rotating for 20 minutes, and draining;
in the primary after-dyeing, by taking the weight of the leather blank as a reference, firstly adding 200% of hot water to ensure that the temperature in the rotary drum reaches 50-52 ℃, then adding 2% of grease RUN, 2% of fatting agent 2012, 2% of fatting agent Tis and 2% of fatting agent BA, rotating for 60 minutes, adding the dye again, rotating for 50 minutes, adding 2% of formic acid after the color is detected to be qualified, adding the formic acid for three times at intervals of 20 minutes each time, finally washing with water, cooling, taking out of the drum, and setting aside for standing;
in the filling and dyeing process, the pure natural plant tanning agents comprise wattle extract FS, quebracho extract ATO and modified areca extract GMB, and the acrylic resin retanning agent adopts acrylic resin high-efficiency retanning agent 3315 produced by Basca chemical company Limited and acrylic resin retanning agent R83 produced by Toepler chemical company Limited;
the environment-friendly aldehyde tanning agent is a fatty aldehyde tanning agent PF produced by German Simma chemical industry Co., Ltd, the environment-friendly synthetic tanning agent is a synthetic tanning agent HN produced by German Delui, and in the retanning procedure, the synthetic tanning agent HN is used as a retanning agent and is matched with the fatty aldehyde tanning agent PF and the fatliquoring agent GLH for retanning;
in the retanning procedure, 1% of oxalic acid, 0.3% of formic acid, 0.5% of a rewetting agent MPC and 0.3% of a degreasing agent SAF are added into water with the liquor ratio of 200% in a rotary drum and the temperature of 40 ℃ and rotated for 120 minutes, the rewetting degree is checked, the sufficient rewetting is ensured, the pH value requires 3-3.3, the water is drained, the water is washed for 10 minutes, the water is drained, 150% of water is added, the temperature is 35 ℃, 2% of a fatty aldehyde tanning agent PF and 2% of a fatting agent GLH are added, the water is rotated for 30 minutes, 3% of a retanning agent HN is added, 1.5% of sodium formate and 0.5% of baking soda are added, the baking soda is rotated for 30 minutes, the baking time is 0.5% of baking soda is added, the pH value is checked to be 4-4.2, and the rotary drum is stopped for 5-7 hours;
in the neutralization process, 2 percent of neutralization tannin PAK-S and 1.5 percent of sodium formate are added into water with the liquid ratio of 150 percent in a rotary drum and the temperature of 35 ℃ for rotating for 30 minutes, then 2 percent of baking soda is added for rotating for 90 minutes, the neutralization degree is detected, the neutralization degree is completely penetrated, the pH value is 5.5-5.8, the water is washed for 10 minutes, and the water is drained and washed;
in the leather grinding process, the leather embryos are strictly sorted according to the disability types and the disability degrees of the leather embryos, and then the sorted leather embryos are subjected to personalized leather grinding.
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| CN109536649A (en) * | 2018-12-29 | 2019-03-29 | 峰安皮业股份有限公司 | A kind of production method of environment-friendly type waterproof mercerising suede |
| CN109536646A (en) * | 2018-12-29 | 2019-03-29 | 峰安皮业股份有限公司 | A kind of half vegetable tanning wax of environment-friendly type becomes the production method of tire cow hide |
| CN109628656A (en) * | 2018-12-17 | 2019-04-16 | 兴业皮革科技股份有限公司 | It is a kind of to steep the soft production technology for falling line leather |
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| CN109628656A (en) * | 2018-12-17 | 2019-04-16 | 兴业皮革科技股份有限公司 | It is a kind of to steep the soft production technology for falling line leather |
| CN109536649A (en) * | 2018-12-29 | 2019-03-29 | 峰安皮业股份有限公司 | A kind of production method of environment-friendly type waterproof mercerising suede |
| CN109536646A (en) * | 2018-12-29 | 2019-03-29 | 峰安皮业股份有限公司 | A kind of half vegetable tanning wax of environment-friendly type becomes the production method of tire cow hide |
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