CN112779372B - Preparation method of environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather - Google Patents
Preparation method of environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather Download PDFInfo
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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
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B1/00—Manufacture of leather; Machines or devices therefor
- C14B1/58—Drying
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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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/08—Deliming; Bating; Pickling; Degreasing
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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
- C14C11/00—Surface finishing of leather
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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
Abstract
The invention provides a preparation method of environment-friendly semi-vegetable tanning-metal tanning mould-proof light-resistant suede, which can overcome the defects of a single non-chrome tanning process, greatly improve the light resistance, dyeing property and mould resistance of suede, realize chrome-free tanning and greatly reduce the pollution problems of formaldehyde and the like, and sequentially comprises the following steps of: the method comprises the following steps: adding a second-layer skin of cattle, a white tannin extract and ritoduo GLH into a rotary drum, rotating for 55-65 minutes, then adding a dalentan ZAT multi-metal tanning agent for retanning and rotating for 160-200 minutes, then adding sodium formate for rotating for 15-25 minutes, and then adding sodium bicarbonate for rotating for 25-35 minutes; step two: adding an alkali extracting agent, adjusting the pH value to 3.5-4.5, rotating for 140 minutes, and discharging the solution in the rotary drum after rotating.
Description
Technical Field
The invention relates to the technical field of suede leather, in particular to a preparation method of environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather.
Background
The suede leather is produced by polishing the surface of leather blank into suede and dyeing with various popular colors. The suede leather can be imitated by artificial leather or made of two layers of leather.
Chrome tanning is a mainstream technology for tanning leather at present, can endow leather with excellent physical and chemical properties, but has a serious environmental pollution problem, and mainly comprises three aspects: (1) pollution of chromium-containing materials in production and processing; (2) pollution of sewage, sludge and chromium-containing solid waste in the tanning production process; (3) secondary pollution to the environment after the chromium-containing product is consumed. With the development of global economy and the progress of society, the enhancement of environmental awareness and the shortage of chromium resources, the pollution problem caused by chrome tanning products and processes is receiving increasing attention.
The non-chrome tanning agent has remarkable environmental protection characteristic due to no chrome, and the main tanning agents are three types: aldehyde tanning agent, tannin extract tanning agent and inorganic metal tanning agent. However, non-chrome tanning agents also present a series of problems in commercial production: the shrinkage temperature of the leather can not be stabilized above 90 ℃; the difference between the leather performance and the chrome tanned leather is large; the skin of the vegetable tanned leather is hard and has insufficient tanning property; the subsequent processability is poor, and the existing processing technology system needs to be changed for further processing; has the pollution problems of organic phosphorus, formaldehyde and the like. Therefore, the development of an environment-friendly and practical leather-making process for non-chrome tanning clean production is urgently needed to further improve the leather-making performance.
The existing researches on metal tanning, vegetable tanning and synthetic tanning agents are mainly focused on products such as first-layer leather, pigskin, sheepskin and the like, and various composite tanning process researches on cattle second-layer suede leather are still lacking. In addition, most of the dyed leathers on the market today show discoloration or discoloration after exposure to uv light for a period of time. This is because: in photochemical reactions one or more of the molecules involved in the reaction are capable of absorbing light energy, after which the compound is in an "excited" state. Studies by scholars indicate that aromatic compounds tend to absorb high-energy uv radiation. However, plant tannins and dyes are aromatic compounds, and thus, they are inferior in light fastness. Nowadays, consumers have high standard requirements on the physical and chemical properties of products, and have very strict requirements on the light resistance, color and the like of leather, which becomes a problem troubling the consumers.
The defects of the prior suede leather are as follows: the defects of a single non-chrome tanning process cannot be overcome, the light fastness, the dyeing property and the mildew resistance of the suede leather cannot be improved, the chrome-free tanning cannot be realized, and the pollution problems of a large amount of aldehyde and the like exist.
Disclosure of Invention
The invention aims to overcome the defects of a single non-chrome tanning process, greatly improve the light resistance, dyeing property and mildew resistance of suede, realize chrome-free tanning and greatly reduce the pollution problems of formaldehyde and the like by aiming at the defects and the defects of the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather comprises the following steps in sequence:
the method comprises the following steps: adding a second-layer skin of cattle, a white tannin extract and ritoduo GLH into a rotary drum, rotating for 55-65 minutes, then adding a dalentan ZAT multi-metal tanning agent for retanning and rotating for 160-200 minutes, then adding sodium formate for rotating for 15-25 minutes, and then adding sodium bicarbonate for rotating for 25-35 minutes;
step two: adding an alkaline reagent, adjusting the pH to 3.5-4.5, rotating for 100-140 minutes, and discharging the solution in the rotary drum after rotating;
step three: adding 25-35 deg.C water, adding sodium formate and neutralized tannin, rotating for 25-35 min, adding ammonium bicarbonate and sodium bicarbonate, rotating for 55-65 min, adding synthetic tanning agent, rotating for 25-35 min, and inspecting the state of the second layer of cattle hide;
step four: adding 35-45 deg.C water, adding three times of formic acid, rotating for 15-25 min each time, and adjusting pH to 4.1-4.3;
step five: adding 40-50 deg.C water, sulfited fish oil, sulfited synthetic oil, and neatsfoot oil to neutralize and lubricate;
step six: adding lecithin, synthetic oil and synthetic tanning agent, rotating for 30-40 min, adding tannin extract, saccharified castanea mollissima tannin extract, substituted tannin and dye, rotating for 30-60 min, and checking the penetration degree;
step seven: after the skin is completely penetrated, adding synthetic grease, neatsfoot oil, synthetic oil and a mildew preventive, rotating for 60 minutes, adding formic acid with the weight of 0.5% of the cow second-layer skin, rotating for 15-25 minutes, adding formic acid with the weight of 0.6% of the cow second-layer skin twice, rotating for 15-25 minutes each time to enable the pH value to be 3.0-4.0, sealing, washing twice, then taking out, flatly laying and standing, and then drying to obtain suede skin;
heating the cowhide second layer skin by using steam after the drying treatment in the seventh step for 25 minutes, and quickly cooling to normal temperature after the heating;
flatly paving the reversed suede leather obtained in the step seven on a table, smearing wear-resistant paint, rolling, repeating the smearing-rolling operation for 2-3 times, and airing;
putting the bovine second-layer skin into water at 30 ℃ before the step one, adding sodium chloride and a degreasing agent, rotating, and taking out the bovine second-layer skin after rotating;
in the first step, the adding amount of the white tannin extract is 5.0 percent of the weight of the second hide, the adding amount of ritodol GLH is 0.5 percent of the weight of the second hide, the adding amount of the davitant ZAT multi-metal tanning agent is 5.0 percent of the weight of the second hide, the adding amount of sodium formate is 1.0 percent of the weight of the second hide, and the adding amount of sodium bicarbonate is 0.5 percent of the weight of the second hide;
the addition amount of the alkali extracting agent in the second step is 0.5 percent of the weight of the second-layer leather of the cattle;
in the third step, the addition of sodium formate is 1.5 percent of the weight of the second-layer leather of cattle, the addition of neutralizing tannin is 1.5 percent of the weight of the second-layer leather of cattle, the addition of ammonium bicarbonate is 1.0 percent of the weight of the second-layer leather of cattle, the addition of sodium bicarbonate is 0.5 percent of the weight of the second-layer leather of cattle, and the addition of a synthetic tanning agent is 2.0 percent of the weight of the second-layer leather of cattle;
in the fourth step, the addition amount of formic acid is 0.3 to 0.5 percent of the weight of the second-layer hide of cattle;
in the fifth step, the addition amount of the sulfurated fish oil is 3.0 percent of the weight of the second-layer leather, the addition amount of the sulfited synthetic oil is 4.0 percent of the weight of the second-layer leather, and the addition amount of the neatsfoot oil is 3.0 percent of the weight of the second-layer leather;
in the sixth step, the addition amount of lecithin is 1.0 percent of the weight of the second-layer leather of cattle, the addition amount of synthetic oil is 1.0 percent of the weight of the second-layer leather of cattle, the addition amount of synthetic tanning agent is 3.0 percent of the weight of the second-layer leather of cattle, the addition amount of white tannin extract is 5.0 percent of the weight of the second-layer leather of cattle, the addition amount of saccharified chestnut tannin extract is 5.0 percent of the weight of the second-layer leather of cattle, and the addition amount of substituted tannin is 2.0 percent of the weight of the second-layer leather of cattle;
in the seventh step, the adding amount of the synthetic grease is 3.0 percent of the weight of the second layer of cattle hide, the adding amount of the synthetic oil is 2.0 percent of the weight of the second layer of cattle hide, the adding amount of the mildew preventive is 0.3 percent of the weight of the second layer of cattle hide, and the adding amount of the neat foot oil is 3.0 percent of the weight of the second layer of cattle hide.
After the technical scheme is adopted, the invention has the beneficial effects that:
the method comprises the following steps: the white tannin extract has super light resistance and excellent permeability, the white tannin extract is added into the cattle second-layer leather to improve the super light resistance and the permeability of the cattle second-layer leather, the brilliance, the aging resistance and the body fullness of the cattle second-layer leather are primarily improved, the riton-wave GLH also has the light resistance, the permeability, the leveling property and the emulsibility, the permeability, the light resistance, the softness and the fullness of the cattle second-layer leather are improved again, the Darwent ZAT multi-metal tanning agent is formaldehyde-free and environment-friendly, the manufactured leather can reach higher shrinkage temperature, the absorptivity reaches more than 90 percent, the cattle second-layer leather has higher shrinkage temperature, is flat, fine, natural and soft, the light resistance, the softness, the fullness and the dyeing property of the cattle second-layer leather are improved in an all-round way through the matching of the white tannin extract, the riton-wave GLH and the Darwent ZAT multi-metal tanning agent, the shrinkage temperature can reach more than 90 ℃, the chromium content of wastewater is 0ppm, the wastewater treatment cost is low;
step two: the pH value of the solution is slowly increased through the alkali extracting agent, so that the operation of the subsequent steps is facilitated;
step three: the mixture of the neutral tannin and the synthetic tanning agent has good buffering and neutralizing capacity, so that the pH value can slowly and uniformly rise, the subsequent wastewater treatment difficulty is reduced, the physical properties of the original leather are kept, the fibers of the second-layer leather of the cattle are effectively protected, the soft hand feeling is ensured, the permeation and the absorption of subsequent anionic dye are promoted, and the subsequent anionic dye is not discolored; the synthetic tanning agent has good light resistance and wear resistance, and improves the tight, compact and plump hand feeling of the second layer of cattle hide; the problems of loose skin edges and abdomen, insufficient fullness, poor tearing strength, blackening and uneven dyeing of dry and hard skin surfaces of skins of the second layer of the cattle hide are preliminarily improved, so that the second layer of the cattle hide is permeable and full;
step five: the water, the sulfited fish oil, the sulfited synthetic oil and the cow hoof oil can improve the space weaving structure of the cow second-layer leather fibers, promote permeation and absorption, enable later dyeing and greasing to be more uniform, improve hand feeling and elasticity of the cow second-layer leather, enable the cow second-layer leather to be fine and compact, enable the cow second-layer leather to have a silk touch feeling, enable the cow second-layer leather to be more permeable, and solve the problems of dry and hard leather core, insufficient fullness, low tearing force and the like of the cow second-layer leather;
step six: the white tannin extract, the synthetic tanning agent and the saccharified castanea mollissima tannin extract have good tanning performance and light color effect, can remarkably improve the fullness of the ox second-layer leather, improve hand feeling, solve the problem of side belly looseness caused by the traditional filler, effectively reduce the formaldehyde content in the ox second-layer leather, and can be controlled below 5 ppm;
step seven: after drying, the second-layer cattle hide is full of meat, comfortable in hand feeling, soft in skin, stiff and firm in skin, tight in edge and abdomen, not loose, high in utilization rate, controllable in formaldehyde content below 5ppm, high-temperature resistant at 95 ℃ and capable of effectively preventing loss caused by mildew due to long-term storage. The synthetic grease and the mildew preventive can endow the secondary cattle hide with excellent softness and mild hand feeling without influencing the plumpness and tearing force of the hide, solve the problems of loose skin edges and abdomen, poor position, insufficient tearing resistance, greasy feeling and color running in the later period and the like caused by the traditional sulfited fish oil, have good mildew prevention effect of suede leather, and endow the secondary cattle hide with soft and comfortable hand feeling by the hoof oil. The advantages of three environment-friendly fat liquoring agents, namely sulfited synthetic oil, neatsfoot oil and synthetic grease, are combined, the fatliquored leather has a visual effect of softness, bone feeling and no stiffness, the light resistance is good, and the utilization rate of the suede leather blank is more than 95%.
Further effects are as follows: the leather surface of the second layer of the cattle after backwater is compact, the suede is fine and smooth, the loose parts at the edge and abdomen are reduced, the leather body is soft, the body and the bone are stiff, and the leather yield is high.
Further effects are as follows: the ox second layer leather is heated by steam, and is cooled to normal temperature after being heated, so that the internal structure of the ox second layer leather is compact, and the light fastness, the dyeing property and the mildew resistance are greatly improved.
Further effects are as follows: the wear-resistant coating can permeate into the inner part of the plush skin to play a role in bonding and reinforcing, can permeate into fiber bundles with loose plush skin under the rolling action, and also has a good long-acting lubricating effect.
Detailed Description
The invention will now be further illustrated with reference to specific examples.
Example 1, the technical solution adopted in this embodiment is:
a method for preparing environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather comprises the following steps in sequence:
the method comprises the following steps: adding the second layer of skin of cattle, white tannin extract and ritoduo GLH into a rotary drum, rotating for 55 minutes, adding the dalaptan ZAT multi-metal tanning agent for retanning and rotating for 160 minutes, adding sodium formate, rotating for 15 minutes, adding sodium bicarbonate, and rotating for 25 minutes;
step two: adding an alkali extracting agent, adjusting the pH to 3.5, rotating for 100 minutes, and discharging the solution in the rotary drum after rotating;
step three: adding 25 deg.C water, adding sodium formate and neutralized tannin, rotating for 25 min, adding ammonium bicarbonate and sodium bicarbonate, rotating for 55 min, adding synthetic tanning agent, rotating for 25 min, and inspecting the state of the second layer of cow skin;
step four: adding 35 ℃ water, adding three times of equivalent formic acid respectively, rotating for 15 minutes each time, and adjusting the pH value to 4.1;
step five: adding water with the temperature of 40 ℃, sulfited fish oil, sulfited synthetic oil and neat's foot oil to neutralize and lubricate the mixture;
step six: adding lecithin, synthetic oil and synthetic tanning agent, rotating for 30 min, adding white tannin extract, saccharified castanea mollissima tannin extract, substituted tannin and dye, rotating for 30 min, and checking the core penetration degree;
step seven: and after the leather is completely penetrated, adding the synthetic grease, the neat's foot oil, the synthetic oil and the mildew preventive, rotating for 60 minutes, adding formic acid with the weight of 0.5 percent of the second-layer leather of the cow, rotating for 15 minutes, adding the formic acid with the weight of 0.6 percent of the second-layer leather of the cow, rotating for 15 minutes twice each time to enable the pH value to be 3.0, performing sealing and washing twice, then performing bulging, tiling and standing, and performing drying treatment to obtain the suede leather.
And (3) putting the bovine second-layer skin into 30 ℃ water before the first step, adding sodium chloride and a degreasing agent, rotating, and taking out the bovine second-layer skin after rotating.
In the first step, the adding amount of the white tannin extract is 5.0 percent of the weight of the second hide, the adding amount of ritotol GLH is 0.5 percent of the weight of the second hide, the adding amount of the davitant ZAT multi-metal tanning agent is 5.0 percent of the weight of the second hide, the adding amount of sodium formate is 1.0 percent of the weight of the second hide, and the adding amount of sodium bicarbonate is 0.5 percent of the weight of the second hide.
And in the second step, the addition amount of the alkali-extracting agent is 0.5 percent of the weight of the second-layer leather of the cattle.
In the third step, the addition amount of sodium formate is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of neutralizing tannin is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of ammonium bicarbonate is 1.0 percent of the weight of the second layer of cattle hide, the addition amount of sodium bicarbonate is 0.5 percent of the weight of the second layer of cattle hide, and the addition amount of synthetic tanning agent is 2.0 percent of the weight of the second layer of cattle hide.
In the fourth step, the addition amount of the formic acid is 0.3 to 0.5 percent of the weight of the second-layer hide of the cattle.
In the fifth step, the addition amount of the hyposulfurated fish oil is 3.0 percent of the weight of the second layer of cattle hide, the addition amount of the sulfited synthetic oil is 4.0 percent of the weight of the second layer of cattle hide, and the addition amount of the neat's foot oil is 3.0 percent of the weight of the second layer of cattle hide.
In the sixth step, the addition amount of lecithin is 1.0 percent of the weight of the second-layer leather of cattle, the addition amount of synthetic oil is 1.0 percent of the weight of the second-layer leather of cattle, the addition amount of synthetic tanning agent is 3.0 percent of the weight of the second-layer leather of cattle, the addition amount of white tannin extract is 5.0 percent of the weight of the second-layer leather of cattle, the addition amount of saccharified chestnut tannin extract is 5.0 percent of the weight of the second-layer leather of cattle, and the addition amount of substituted tannin is 2.0 percent of the weight of the second-layer leather of cattle.
In the seventh step, the adding amount of the synthetic grease is 3.0 percent of the weight of the second layer of cattle hide, the adding amount of the synthetic oil is 2.0 percent of the weight of the second layer of cattle hide, the adding amount of the mildew preventive is 0.3 percent of the weight of the second layer of cattle hide, and the adding amount of the neat foot oil is 3.0 percent of the weight of the second layer of cattle hide. The alkali extracting agent is sodium bicarbonate.
And seventhly, heating the ox second-layer skin by using steam after the drying treatment in the step seven, heating for 25 minutes, and quickly cooling to the normal temperature after heating.
And flatly paving the reversed suede obtained in the seventh step on a table, coating the wear-resistant coating, rolling, repeating the coating-rolling operation for 2-3 times, and airing.
Example 2, the technical solution adopted in this embodiment is:
a method for preparing environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather comprises the following steps in sequence:
the method comprises the following steps: adding the second layer of skin of cattle, white tannin extract and ritofo GLH into a rotary drum, rotating for 60 minutes, adding the dalentan ZAT multi-metal tanning agent, retanning for 180 minutes, adding sodium formate, rotating for 20 minutes, adding sodium bicarbonate, and rotating for 30 minutes;
step two: adding an alkali extracting agent, adjusting the pH to 4.0, rotating for 120 minutes, and discharging the solution in the rotary drum after rotating;
step three: adding 25-35 deg.C water, adding sodium formate and neutralized tannin, rotating for 30 min, adding ammonium bicarbonate and sodium bicarbonate, rotating for 60 min, adding synthetic tanning agent, rotating for 30 min, and inspecting the state of cow second layer skin;
step four: adding 40 deg.C water, adding formic acid with same amount for three times, rotating for 20 min each time, and adjusting pH to 4.2;
step five: adding 45 ℃ water, sulfited fish oil, sulfited synthetic oil and neatsfoot oil to neutralize and lubricate the mixture;
step six: adding lecithin, synthetic oil and synthetic tanning agent, rotating for 35 min, adding white tannin extract, saccharified castanopsis mollissima tannin extract, substituted tannin and dye, rotating for 45 min, and checking the penetration degree;
step seven: and after the skin is completely penetrated, adding the synthetic grease, the cow hoof oil, the synthetic oil and the mildew preventive, rotating for 60 minutes, adding formic acid with the weight of 0.5% of the cow second-layer skin, rotating for 20 minutes, adding formic acid with the weight of 0.6% of the cow second-layer skin, rotating for 20 minutes each time to enable the pH value to be 3.5, sealing, washing twice, taking out, flatly laying, standing, and drying to obtain the suede skin.
And (3) putting the bovine second-layer skin into 30 ℃ water before the first step, adding sodium chloride and a degreasing agent, rotating, and taking out the bovine second-layer skin after rotating.
In the first step, the adding amount of the white tannin extract is 5.0 percent of the weight of the second hide, the adding amount of ritotol GLH is 0.5 percent of the weight of the second hide, the adding amount of the davitant ZAT multi-metal tanning agent is 5.0 percent of the weight of the second hide, the adding amount of sodium formate is 1.0 percent of the weight of the second hide, and the adding amount of sodium bicarbonate is 0.5 percent of the weight of the second hide.
And in the second step, the addition amount of the alkali-extracting agent is 0.5 percent of the weight of the second-layer leather of the cattle.
In the third step, the addition amount of sodium formate is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of neutralizing tannin is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of ammonium bicarbonate is 1.0 percent of the weight of the second layer of cattle hide, the addition amount of sodium bicarbonate is 0.5 percent of the weight of the second layer of cattle hide, and the addition amount of synthetic tanning agent is 2.0 percent of the weight of the second layer of cattle hide.
The addition amount of the formic acid in the fourth step is 0.3-0.5% of the weight of the second layer of the cattle hide.
In the fifth step, the addition amount of the hyposulfurated fish oil is 3.0 percent of the weight of the second layer of cattle hide, the addition amount of the sulfited synthetic oil is 4.0 percent of the weight of the second layer of cattle hide, and the addition amount of the neat's foot oil is 3.0 percent of the weight of the second layer of cattle hide.
In the sixth step, the addition amount of lecithin is 1.0 percent of the weight of the skins of the cattle second layer, the addition amount of synthetic oil is 1.0 percent of the weight of the skins of the cattle second layer, the addition amount of synthetic tanning agent is 3.0 percent of the weight of the skins of the cattle second layer, the addition amount of white tannin extract is 5.0 percent of the weight of the skins of the cattle second layer, the addition amount of saccharified chestnut tannin extract is 5.0 percent of the weight of the skins of the cattle second layer, and the addition amount of substituted tannin is 2.0 percent of the weight of the skins of the cattle second layer.
In the seventh step, the adding amount of the synthetic grease is 3.0 percent of the weight of the second-layer buffalo, the adding amount of the synthetic oil is 2.0 percent of the weight of the second-layer buffalo, the adding amount of the mildew preventive is 0.3 percent of the weight of the second-layer buffalo, and the adding amount of the neatsfoot oil is 3.0 percent of the weight of the second-layer buffalo. The alkali extracting agent is sodium bicarbonate.
And seventhly, heating the ox second-layer skin by using steam after the drying treatment in the step seven, heating for 25 minutes, and quickly cooling to the normal temperature after heating.
And (5) flatly laying the reversed suede obtained in the step seven on a table, coating the wear-resistant coating, rolling, repeating the coating-rolling operation for 2-3 times, and airing.
Example 3, the technical solution adopted by this specific embodiment is:
a method for preparing environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede comprises the following steps in sequence:
the method comprises the following steps: adding the second layer of skin of cattle, white tannin extract and ritofo GLH into a rotary drum, rotating for 65 minutes, adding the dalentan ZAT multi-metal tanning agent, retanning for 200 minutes, adding sodium formate, rotating for 25 minutes, adding sodium bicarbonate, and rotating for 35 minutes;
step two: adding an alkali extracting agent, adjusting the pH to 4.5, rotating for 140 minutes, and discharging the solution in the rotary drum after rotating;
step three: adding 35 deg.C water, adding sodium formate and neutral tannin, rotating for 35 min, adding ammonium bicarbonate and sodium bicarbonate, rotating for 65 min, adding synthetic tanning agent, rotating for 35 min, and inspecting the state of the second layer of cow skin;
step four: adding 45 ℃ water, adding three times of equivalent formic acid respectively, rotating for 25 minutes each time, and adjusting the pH value to 4.3;
step five: adding 50 ℃ water, sulfited fish oil, sulfited synthetic oil and neat foot oil to neutralize and lubricate the mixture;
step six: adding lecithin, synthetic oil and synthetic tanning agent, rotating for 40 min, adding white tannin extract, saccharified castanea mollissima tannin extract, substituted tannin and dye, rotating for 60 min, and checking the core penetration degree;
step seven: and after the leather is completely penetrated, adding the synthetic grease, the neat's foot oil, the synthetic oil and the mildew preventive, rotating for 60 minutes, adding formic acid with the weight of 0.5% of the second-layer leather of the cow, rotating for 25 minutes, adding the formic acid with the weight of 0.6% of the second-layer leather of the cow, rotating for 25 minutes each time to enable the pH value to be 4.0, performing sealing and washing twice, then performing bulging, tiling and standing, and performing drying treatment to obtain the suede leather.
And (3) putting the bovine second-layer skin into 30 ℃ water before the first step, adding sodium chloride and a degreasing agent, rotating, and taking out the bovine second-layer skin after rotating.
In the first step, the adding amount of the white tannin extract is 5.0 percent of the weight of the second hide, the adding amount of ritotol GLH is 0.5 percent of the weight of the second hide, the adding amount of the davitant ZAT multi-metal tanning agent is 5.0 percent of the weight of the second hide, the adding amount of sodium formate is 1.0 percent of the weight of the second hide, and the adding amount of sodium bicarbonate is 0.5 percent of the weight of the second hide.
And in the second step, the addition amount of the alkali-extracting agent is 0.5 percent of the weight of the second-layer leather of the cattle.
In the third step, the addition amount of sodium formate is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of neutralizing tannin is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of ammonium bicarbonate is 1.0 percent of the weight of the second layer of cattle hide, the addition amount of sodium bicarbonate is 0.5 percent of the weight of the second layer of cattle hide, and the addition amount of synthetic tanning agent is 2.0 percent of the weight of the second layer of cattle hide.
The addition amount of the formic acid in the fourth step is 0.3-0.5% of the weight of the second layer of the cattle hide.
In the fifth step, the addition amount of the hyposulfurated fish oil is 3.0 percent of the weight of the second layer of cattle hide, the addition amount of the sulfited synthetic oil is 4.0 percent of the weight of the second layer of cattle hide, and the addition amount of the neat's foot oil is 3.0 percent of the weight of the second layer of cattle hide.
In the sixth step, the addition amount of lecithin is 1.0 percent of the weight of the skins of the cattle second layer, the addition amount of synthetic oil is 1.0 percent of the weight of the skins of the cattle second layer, the addition amount of synthetic tanning agent is 3.0 percent of the weight of the skins of the cattle second layer, the addition amount of white tannin extract is 5.0 percent of the weight of the skins of the cattle second layer, the addition amount of saccharified chestnut tannin extract is 5.0 percent of the weight of the skins of the cattle second layer, and the addition amount of substituted tannin is 2.0 percent of the weight of the skins of the cattle second layer.
In the seventh step, the adding amount of the synthetic grease is 3.0 percent of the weight of the second layer of cattle hide, the adding amount of the synthetic oil is 2.0 percent of the weight of the second layer of cattle hide, the adding amount of the mildew preventive is 0.3 percent of the weight of the second layer of cattle hide, and the adding amount of the neat foot oil is 3.0 percent of the weight of the second layer of cattle hide. The alkali extracting agent is sodium bicarbonate.
And seventhly, heating the ox second-layer skin for 25 minutes by using steam after drying treatment, and quickly cooling to normal temperature after heating.
And (5) flatly laying the reversed suede obtained in the step seven on a table, coating the wear-resistant coating, rolling, repeating the coating-rolling operation for 2-3 times, and airing.
While there have been shown and described what are at present considered to be the fundamental and essential features of the invention and its advantages, it will be understood by those skilled in the art that the invention is not limited by the embodiments described above, which are merely illustrative of the principles of the invention, but various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims and their equivalents. The invention is not described in detail, but is well known to those skilled in the art.
Claims (1)
1. The preparation method of the environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede is characterized by comprising the following steps in sequence:
the method comprises the following steps: adding a second-layer skin of cattle, a white tannin extract and ritoduo GLH into a rotary drum, rotating for 55-65 minutes, then adding a dalentan ZAT multi-metal tanning agent for retanning and rotating for 160-200 minutes, then adding sodium formate for rotating for 15-25 minutes, and then adding sodium bicarbonate for rotating for 25-35 minutes;
step two: adding an alkali extracting agent, adjusting the pH value to 3.5-4.5, rotating for 140 minutes, and discharging the solution in the rotary drum after rotating;
step three: adding 25-35 deg.C water, adding sodium formate and neutralized tannin, rotating for 25-35 min, adding ammonium bicarbonate and sodium bicarbonate, rotating for 55-65 min, adding synthetic tanning agent, rotating for 25-35 min, and inspecting the state of the second layer of cattle hide;
step four: adding 35-45 deg.C water, adding three times of formic acid, rotating for 15-25 min each time, and adjusting pH to 4.1-4.3;
step five: adding 40-50 deg.C water, sulfited fish oil, sulfited synthetic oil, and neatsfoot oil to neutralize and lubricate;
step six: adding lecithin, synthetic oil and synthetic tanning agent, rotating for 30-40 min, adding tannin extract, saccharified castanea mollissima tannin extract, substituted tannin and dye, rotating for 30-60 min, and checking the penetration degree;
step seven: after the skin is completely penetrated, adding synthetic grease, neat's foot oil, synthetic oil and mildew preventive, rotating for 60 minutes, adding formic acid with the weight of 0.5% of the second-layer skin of the cow, rotating for 15-25 minutes, adding formic acid with the weight of 0.6% of the second-layer skin of the cow twice, rotating for 15-25 minutes each time to enable the pH value to be 3.0-4.0, performing sealing and washing twice, then taking out, spreading, standing, and drying to obtain the suede skin;
heating the cowhide second layer skin by using steam after the drying treatment in the seventh step for 25 minutes, and quickly cooling to normal temperature after the heating;
flatly paving the reversed suede leather obtained in the step seven on a table, smearing wear-resistant paint, rolling, repeating the smearing-rolling operation for 2-3 times, and airing;
putting the bovine second-layer skin into water at 30 ℃ before the step one, adding sodium chloride and a degreasing agent, rotating, and taking out the bovine second-layer skin after rotating;
in the first step, the adding amount of the white tannin extract is 5.0 percent of the weight of the second hide, the adding amount of ritonavir GLH is 0.5 percent of the weight of the second hide, the adding amount of the davitant ZAT multi-metal tanning agent is 5.0 percent of the weight of the second hide, the adding amount of sodium formate is 1.0 percent of the weight of the second hide, and the adding amount of sodium bicarbonate is 0.5 percent of the weight of the second hide;
the addition amount of the alkali-extracting agent in the second step is 0.5 percent of the weight of the second-layer leather;
in the third step, the addition amount of sodium formate is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of neutralizing tannin is 1.5 percent of the weight of the second layer of cattle hide, the addition amount of ammonium bicarbonate is 1.0 percent of the weight of the second layer of cattle hide, the addition amount of sodium bicarbonate is 0.5 percent of the weight of the second layer of cattle hide, and the addition amount of synthetic tanning agent is 2.0 percent of the weight of the second layer of cattle hide;
the addition amount of the formic acid in the fourth step is 0.3 to 0.5 percent of the weight of the second layer of the oxhide;
in the fifth step, the addition amount of the sulfurated fish oil is 3.0 percent of the weight of the second-layer leather, the addition amount of the sulfited synthetic oil is 4.0 percent of the weight of the second-layer leather, and the addition amount of the neatsfoot oil is 3.0 percent of the weight of the second-layer leather;
in the sixth step, the addition amount of lecithin is 1.0 percent of the weight of the second-layer leather of cattle, the addition amount of synthetic oil is 1.0 percent of the weight of the second-layer leather of cattle, the addition amount of synthetic tanning agent is 3.0 percent of the weight of the second-layer leather of cattle, the addition amount of white tannin extract is 5.0 percent of the weight of the second-layer leather of cattle, the addition amount of saccharified chestnut tannin extract is 5.0 percent of the weight of the second-layer leather of cattle, and the addition amount of substituted tannin is 2.0 percent of the weight of the second-layer leather of cattle;
in the seventh step, the adding amount of the synthetic grease is 3.0 percent of the weight of the second layer of cattle hide, the adding amount of the synthetic oil is 2.0 percent of the weight of the second layer of cattle hide, the adding amount of the mildew preventive is 0.3 percent of the weight of the second layer of cattle hide, and the adding amount of the neat foot oil is 3.0 percent of the weight of the second layer of cattle hide.
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