CN110938716A - Method for manufacturing cow double-layer waterproof leather - Google Patents
Method for manufacturing cow double-layer waterproof 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
- 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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/04—Soaking
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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
- C14C3/04—Mineral 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
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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
- C14C3/28—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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- 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
- 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
- D06P1/673—Inorganic compounds
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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 relates to a method for manufacturing cow double-layer waterproof leather, and belongs to the technical field of leather manufacturing. The waterproof leather with the ox second layer is obtained by sequentially carrying out rewetting → retanning → alkali extraction → neutralization → pre-greasing → dyeing → primary fixing → primary greasing → secondary fixing → chromium fixation → sticking plate → drying → softening → buffing → drum throwing → color spraying on the wet leather. The cattle second-layer leather manufactured by the method has excellent waterproof performance and good comfort.
Description
Technical Field
The invention belongs to the technical field of leather manufacturing, and particularly relates to a manufacturing method of cow double-layer waterproof leather.
Background
The second layer of leather is one of natural leather, and compared with the first layer of cowhide, the second layer of leather has relatively poor performance, and the performance of the second layer of leather needs to be improved through a subsequent finishing procedure. The natural leather mainly comprises collagen fibers, a plurality of natural gaps exist among the fibers, and the natural leather contains a plurality of hydrophilic groups, so that the natural leather is easy to absorb water in the later practical process if not subjected to waterproof treatment, and the service life of the natural leather is shortened, so that the waterproof treatment is required in the manufacturing process of the natural leather product, and the later nursing of the natural leather product is facilitated.
At present, the waterproof performance of the cow second-layer leather still needs to be improved, and the leather still has good comfort while the waterproof performance is improved, so that the technical problem which needs to be solved in the field is urgent.
Disclosure of Invention
The invention aims to solve the defects of the prior art and provide a method for manufacturing a cowhide two-layer waterproof leather.
The invention adopts the following technical scheme:
the manufacturing method of the cattle second-layer waterproof leather comprises the following steps:
and (3) sequentially carrying out rewetting → retanning → alkali extraction → neutralization → pre-fatliquoring → dyeing → primary fixing → main fatliquoring → secondary fixing → chromium fixing → veneer → drying → softening → buffing → drum throwing → color spraying on the wet blue leather to obtain the waterproof leather with the ox II layer.
Furthermore, the manufacturing method of the cattle second-layer waterproof leather specifically comprises the following steps:
step one, rewetting: putting wet blue leather into a rotary drum, adding 150-250% of water according to the mass percentage of the wet blue leather, keeping the water temperature at 40-50 ℃, adding 0.8-1.2% of fatty aldehyde, operating for 55-65min, adding 0.08-0.12% of soda ash and 0.2-0.4% of degreasing agent, operating for 55-65min, adding 0.2-0.4% of formic acid and 0.5-0.7% of oxalic acid, operating for 55-65min, draining, adding 150-250% of water, washing for 8-12min, draining, and obtaining the wet leather material;
step two, retanning: adding 75-85% of water and 0.3-0.7% of formic acid into a rotary drum according to the mass percentage of the wet blue leather, adjusting the pH to 2.8-3.2, running for 35-45min, adding 3.5-4.5% of chromium powder and 1.8-2.2% of white tannin, running for 115-125min, adding 1.8-2.2% of fatty aldehyde, running for 55-65min, draining liquid, and obtaining retanning leather material;
step three, alkali extraction: according to the mass percent of wet blue leather, adding 45-55% of water and 0.9-1.1% of sodium formate into a rotary drum, running for 25-35min, adding 0.4-0.6% of baking soda, controlling the pH to be 4.0, running for 25-35min, draining, adding 95-105% of water, draining, and obtaining the alkali extracting leather material;
step four, neutralizing: adding 115-125% of water, 2-3% of sodium formate and 1.5-2.5% of neutralized tannin into a rotary drum according to the mass percentage of wet blue leather, operating for 35-45min, simultaneously adding 0.8-1.2% of baking soda and 0.8-1.2% of waterproof oil, then adding 0.4-0.6% of ammonium bicarbonate and 0.5-0.7% of sodium sulfite, operating for 115-125min, draining, adding 150-250% of water, washing for 8-12min, draining to obtain neutralized leather;
step five, pre-greasing: adding 0.8-1.2% of fatting agent into the rotary drum according to the mass percent of the wet blue leather, and running for 25-35min to obtain pre-fatting leather;
step six, dyeing: according to the mass percentage of the wet blue leather, sequentially adding 1.3% -1.7% of environment-friendly tannin, 1.3% -1.7% of composite tannin, 0.8% -1.2% of Basdan FO, 1.8% -2.2% of dispersed tannin and 0.9% -1.1% of ammonia water, simultaneously adding 1.4% -1.6% of dispersed tannin and dye, running for 55-65min, discharging liquid to obtain a dyed leather material, wherein the dye dosage is adjusted according to the required color of the leather material;
step seven, primary fixation: according to the mass percentage of the wet blue leather, adding 110-130% of water into a rotary drum, keeping the water temperature at 35-45 ℃, adding 0.4-0.6% of formic acid, operating for 13-17min, continuously adding 0.4-0.6% of formic acid, operating for 13-17min, then adding 0.6-0.8% of formic acid, operating for 18-22min, adjusting the pH to 4.0, draining, adding 150-250% of water, washing for 8-12min, draining, adding 280-320% of water, washing for 13-17min, draining, and obtaining the primary fixed leather;
step eight, main greasing: adding 45-55% of water into a rotary drum according to the mass percent of wet blue leather, keeping the water temperature at 40-50 ℃, adding 0.6-0.8% of ammonia water, adjusting the pH to 5.5-5.8, running for 15-25min, adding 8-9% of waterproof oil Densodrin ENS, 0.4-0.6% of dichlofluazurin A oil and 0.1-0.2% of preservative, running for 85-95min, and discharging liquid after color matching to obtain the main fatted leather;
step nine, secondary fixation: according to the mass percent of wet blue leather, adding 95-105% of water into a rotary drum, adding 0.2-0.4% of formic acid, operating for 13-17min, adding 0.2-0.4% of formic acid, operating for 8-12min, adding 0.3-0.5% of formic acid, operating for 13-17min, adjusting the pH value to 4.0, washing water after draining, and draining liquid again to obtain secondary fixed leather;
step ten, chromium fixation: according to the mass percent of the wet blue leather, adding 110-120% of water into a rotary drum, adding 0.2-0.4% of formic acid, operating for 8-12min, adding 1.5-2.5% of chromium powder, operating for 55-65min, washing water, and discharging from the drum to obtain the leather after chromium fixation;
and step eleven, sequentially pasting the leather subjected to chromium fixation on a plate, drying, softening, buffing, tumbling and spraying color to obtain the oxfordia secondary waterproof leather.
Further, in the first step, the fatty aldehyde is fatty aldehyde TJ-R706, and the degreasing agent is a degreasing agent PASOSOL B.
Further, in the second step, the white tannin is white tannin TJ-R776, and the fatty aldehyde is TJ-R706.
Further, in the fourth step, the neutralized tannin is Neutrigan, and the waterproof oil is Densodrin ENS.
Further, in the fifth step, the fatliquor is TJ-F9311.
Further, in the sixth step, the environment-friendly tannin is Relugan FS, the composite tannin is BasyntanFR-BC, and the dispersed tannin is Tamol FR-DA.
Still further, in step eight the preservative is MIRECIDE-TC/81. V.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the method comprises the following steps: according to the invention, the wet blue leather is treated by rewetting → retanning → alkali extraction → neutralization → pre-fatliquoring → dyeing → primary fixing → primary fatliquoring → secondary fixing → chromium fixation → pasting → drying → softening → buffing → drum throwing → color spraying, so that the prepared leather with the second layer of cattle leather has excellent waterproof performance, good air permeability and softness and comfort;
in the rewetting step of the first step, water, fatty aldehyde TJ-R706, a degreasing agent PASOSOL B and formic acid are combined for rewetting, so that not only can the leather be endowed with a clean leather surface, but also the fatty aldehyde TJ-R706 can be better permeated into leather fibers, and after the fatty aldehyde TJ-R706 is combined with the leather fibers, the tensile strength and the tearing strength of the leather can be effectively improved, and the leather is endowed with good flexibility;
in the second retanning procedure, water, formic acid, chromium powder, white tannin TJ-R776 and fatty aldehyde TJ-R706 are combined, so that all tanning agents can better permeate into leather fibers, the wear resistance of the leather is improved, the leather is easier to emboss, and most importantly, the leather is endowed with a plump and soft hand feeling;
in the neutralization process of the fourth step, water, neutral tannin Neutrigan, waterproof oil Denprodin ENS, ammonium bicarbonate and sodium sulfite are used in a compatibility manner, so that the leather can be effectively neutralized, the chrome tanning agent cannot be precipitated, no chromium spots on the surface of the leather are ensured, and the quality of the leather is effectively ensured;
in the dyeing process of step six, with environmental protection tannin, compound tannin, basdan FO, dispersed tannin, aqueous ammonia and dyestuff cooperation use, can give the leather tight first class grain face sense and mellow feel, still make the dyestuff change the cross section that permeates the leather, not only guarantee the homogeneity of dyeing, still give the leather grain face good elasticity, still further improved the wearability of leather simultaneously.
In a word, the oxhide double-layer leather produced by the manufacturing method has excellent waterproofness and good comfort;
secondly, the method comprises the following steps: according to the leather waterproof system, all the working procedures are improved, so that the waterproof performance of the leather is greatly improved on the premise of ensuring the comfort of the leather.
Detailed Description
The present invention will be described in further detail with reference to examples.
It will be appreciated by those skilled in the art that the following examples are illustrative of the invention only and should not be taken as limiting the scope of the invention.
The invention uses the following main raw materials and reagents:
degreaser PASTOSOL B, Toeplier chemical dyes Co., Ltd
Aliphatic aldehyde TJ-R706, Tenjiang New materials Ltd
White tannin TJ-R776, Tenjiang New materials GmbH
Neutralizing the tannin Neutrigan, Basff
Water repellent oil Denscodrin ENS, Basff
Fatting agent TJ-F9311, Tenjiang New materials Co., Ltd
Environmental protection tannin Relugan FS, Basff corporation
Composite tannin Basyntan FR-BC, BASF corporation
Disperse tannin Tamol FR-DA, BASF corporation.
DIHYDRODAN A OIL, BASF
Basdan FO, Bassfer
The preservative is lamirsa MIRECIDE-TC/81.V, product code 2332
Example 1
The manufacturing method of the cattle second-layer waterproof leather comprises the following steps: the wet blue leather is sequentially subjected to rewetting → retanning → alkali extraction → neutralization → pre-fatliquoring → dyeing → primary fixing → primary fatliquoring → secondary fixing → chromium fixing → veneer → drying → softening → buffing → drum throwing → color spraying, and the specific steps are as follows:
step one, rewetting: putting wet blue leather into a rotary drum, adding 200% of water according to the mass percentage of the wet blue leather, keeping the water temperature at 45 ℃, adding 1% of fatty aldehyde TJ-R706, running for 60min, adding 0.1% of soda ash and 0.3% of degreasing agent PASTOSOLB, running for 55-65min, adding 0.3% of formic acid and 0.6% of oxalic acid, running for 605min, draining, adding 200% of water, washing for 10min, draining, and obtaining a rewetting leather material;
step two, retanning: according to the mass percent of wet blue leather, adding 80% of water and 0.5% of formic acid into a rotary drum, adjusting the pH to 2.8-3.2, running for 40min, adding 4% of chromium powder and 2% of white tannin TJ-R776, running for 120min, adding 2% of fatty aldehyde TJ-R706, running for 60min, discharging liquid, and obtaining retanning leather material;
step three, alkali extraction: adding 50% of water and 1% of sodium formate into a rotary drum according to the mass percentage of the wet blue leather, running for 30min, adding 0.5% of baking soda, controlling the pH to be 4.0, running for 30min, draining, adding 100% of water, draining, and obtaining an alkali extraction leather material;
step four, neutralizing: according to the mass percent of wet blue leather, adding 120% of water, 2.5% of sodium formate and 2% of neutral tannin Neutrigan into a rotary drum, running for 40min, simultaneously adding 1% of baking soda and 1% of waterproof oil Dendrodrin ENS, then adding 0.5% of ammonium bicarbonate and 0.6% of sodium sulfite, running for 120min, discharging liquid, adding 200% of water, washing for 10min, discharging liquid, and obtaining a neutral leather material;
step five, pre-greasing: adding 1% of fatting agent TJ-F9311 into the rotary drum according to the mass percentage of the wet blue leather, and running for 30min to obtain pre-fatting leather;
step six, dyeing: according to the mass percentage of the wet blue leather, sequentially adding 1.5% of environment-friendly tannin Relugan FS, 1.5% of composite tannin Basyntan FR-BC, 1% of Basdan FO, 2% of dispersed tannin Tamol FR-DA and 1% of ammonia water, simultaneously adding 1.5% of dispersed tannin Tamol FR-DA and dye, running for 60min, discharging liquid to obtain a dyed leather material, wherein the use amount of the dye is adjusted according to the required color of the leather material;
step seven, primary fixation: adding 120% of water into a rotary drum according to the mass percent of wet blue leather, keeping the water temperature at 40 ℃, adding 0.5% of formic acid, running for 15min, continuously adding 0.5% of formic acid, running for 15min, then adding 0.7% of formic acid, running for 20min, adjusting the pH to 4.0, draining, adding 200% of water, washing for 10min, draining, adding 300% of water, washing for 15min, draining, and thus obtaining the primary fixed leather;
step eight, main greasing: adding 50% of water into a rotary drum according to the mass percentage of wet blue leather, keeping the water temperature at 45 ℃, adding 0.7% of ammonia water, adjusting the pH to 5.5-5.8, running for 20min, adding 8.5% of waterproof oil Denprodin ENS, 0.5% of dichlolidin A oil and 0.15% of preservative MIRECIDE-TC/81.V, running for 90min, and discharging liquid after color matching to obtain the main fatliquoring leather;
step nine, secondary fixation: adding 100% of water into a rotary drum according to the mass percent of wet blue leather, adding 0.3% of formic acid, operating for 15min, adding 0.3% of formic acid, operating for 10min, adding 0.4% of formic acid, operating for 15min, adjusting the pH to 4.0, washing after draining, and draining to obtain secondary fixed leather;
step ten, chromium fixation: adding 115% of water into a rotating drum according to the mass percent of the wet blue leather, adding 0.3% of formic acid, operating for 10min, adding 2% of chromium powder, operating for 60min, and washing water out of the drum to obtain the leather after chromium fixation;
and step eleven, sequentially pasting the leather subjected to chromium fixation on a plate, drying, softening, buffing, tumbling and spraying color to obtain the oxfordia secondary waterproof leather.
Example 2
The manufacturing method of the cattle second-layer waterproof leather comprises the following steps: the wet blue leather is sequentially subjected to rewetting → retanning → alkali extraction → neutralization → pre-fatliquoring → dyeing → primary fixing → primary fatliquoring → secondary fixing → chromium fixing → veneer → drying → softening → buffing → drum throwing → color spraying, and the specific steps are as follows:
step one, rewetting: putting wet blue leather into a rotary drum, adding 150% of water according to the mass percentage of the wet blue leather, keeping the water temperature at 40 ℃, adding 0.8% of fatty aldehyde TJ-R706, running for 55min, adding 0.08% of soda ash and 0.2% of degreasing agent PASOSOL B, running for 55min, adding 0.2% of formic acid and 0.5% of oxalic acid, running for 55min, draining, adding 150% of water, washing for 8min, draining, and obtaining a rewetting leather material;
step two, retanning: adding 75% of water and 0.3% of formic acid into a rotary drum according to the mass percentage of wet blue leather, adjusting the pH to 2.8-3.2, running for 35min, adding 3.5% of chromium powder and 1.8% of white tannin TJ-R776, running for 115min, adding 1.8% of fatty aldehyde TJ-R706, running for 55min, discharging liquid, and obtaining a retanning leather material;
step three, alkali extraction: according to the mass percent of the wet blue leather, adding 45% of water and 0.9% of sodium formate into a rotary drum, running for 25min, adding 0.4% of sodium bicarbonate, running for 25min, adding 0.6% of sodium bicarbonate, running for 25min with the pH value of 4.0, draining, adding 95% of water, draining, and obtaining the alkali extracting leather material;
step four, neutralizing: adding 115% of water, 2% of sodium formate and 1.5% of neutral tannin Neutrigan into a rotary drum according to the mass percentage of the wet blue leather, running for 35min, simultaneously adding 0.8% of baking soda and 0.8% of waterproof oil DensorinEns, then adding 0.4% of ammonium bicarbonate and 0.5% of sodium sulfite, running for 115min, discharging liquid, adding 150% of water, washing for 8min, discharging liquid, and obtaining a neutral leather;
step five, pre-greasing: adding 0.8% of fatting agent TJ-F9311 into the rotary drum according to the mass percentage of the wet blue leather, and running for 25min to obtain pre-fatting leather;
step six, dyeing: according to the mass percentage of the wet blue leather, sequentially adding 1.3% of environment-friendly tannin Relugan FS, 1.3% of composite tannin Basyntan FR-BC, 0.8% of Basdan FO, 1.8% of dispersed tannin Tamol FR-DA and 0.9% of ammonia water, simultaneously adding 1.4% of dispersed tannin Tamol FR-DA and dye, running for 55min, discharging liquid to obtain a dyed leather material, wherein the use amount of the dye is adjusted according to the required color of the leather material;
step seven, primary fixation: adding 110% of water into a rotary drum according to the mass percent of wet blue leather, keeping the water temperature at 35 ℃, adding 0.4% of formic acid, running for 13min, continuously adding 0.4% of formic acid, running for 13min, then adding 0.6% of formic acid, running for 18min, adjusting the pH to 4.0, draining, adding 150% of water, washing for 8min, draining, adding 280% of water, washing for 13min, draining, and obtaining the primary fixed leather;
step eight, main greasing: adding 45% of water into a rotary drum according to the mass percentage of wet blue leather, keeping the water temperature at 40 ℃, adding 0.6% of ammonia water, adjusting the pH to 5.5-5.8, running for 15min, adding 8% of waterproof oil Denprodin ENS, 0.4% of dichlolite A oil and 0.1% of preservative MIRECIDE-TC/81.V, running for 85min, and discharging liquid after color matching to obtain the main fatliquoring leather;
step nine, secondary fixation: according to the mass percent of wet blue leather, adding 95% of water into a rotary drum, adding 0.2% of formic acid, operating for 13min, adding 0.2% of formic acid, operating for 8min, adding 0.3% of formic acid, operating for 13min, adjusting the pH to 4.0, washing after draining, and draining to obtain secondary fixed leather;
step ten, chromium fixation: according to the mass percent of the wet blue leather, adding 110% of water into a rotary drum, adding 0.2% of formic acid, operating for 8min, adding 1.5% of chromium powder, operating for 55min, washing water and discharging from the drum to obtain the leather after chromium fixation;
and step eleven, sequentially pasting the leather subjected to chromium fixation on a plate, drying, softening, buffing, tumbling and spraying color to obtain the oxfordia secondary waterproof leather.
Example 3
The manufacturing method of the cattle second-layer waterproof leather comprises the following steps: the wet blue leather is sequentially subjected to rewetting → retanning → alkali extraction → neutralization → pre-fatliquoring → dyeing → primary fixing → primary fatliquoring → secondary fixing → chromium fixing → veneer → drying → softening → buffing → drum throwing → color spraying, and the specific steps are as follows:
step one, rewetting: putting wet blue leather into a rotary drum, adding 250% of water according to the mass percentage of the wet blue leather, keeping the water temperature at 50 ℃, adding 1.2% of fatty aldehyde TJ-R706, running for 65min, adding 0.12% of soda ash and 0.4% of degreasing agent PASOSOL B, running for 65min, adding 0.4% of formic acid and 0.7% of oxalic acid, running for 65min, draining, adding 250% of water, washing for 12min, draining, and obtaining a rewetting leather material;
step two, retanning: adding 85% of water and 0.7% of formic acid into a rotary drum according to the mass percentage of wet blue leather, adjusting the pH to 2.8-3.2, running for 45min, adding 4.5% of chromium powder and 2.2% of white tannin TJ-R776, running for 125min, adding 2.2% of fatty aldehyde TJ-R706, running for 65min, discharging liquid, and obtaining a retanning leather material;
step three, alkali extraction: adding 55% of water and 1.1% of sodium formate into a rotary drum according to the mass percent of the wet blue leather, running for 35min, adding 0.6% of sodium bicarbonate, running for 35min, adding 0.4% of sodium bicarbonate, running for 35min with the pH value of 4.0, draining, adding 105% of water, draining, and obtaining an alkali extracting leather material;
step four, neutralizing: according to the mass percent of wet blue leather, adding 125% of water, 3% of sodium formate and 2.5% of neutral tannin Neutrigan into a rotary drum, running for 45min, simultaneously adding 1.2% of baking soda and 1.2% of waterproof oil DensorinEns, then adding 0.6% of ammonium bicarbonate and 0.7% of sodium sulfite, running for 125min, discharging liquid, adding 250% of water, washing for 12min, discharging liquid, and obtaining a neutral leather material;
step five, pre-greasing: adding 1.2% of fatting agent TJ-F9311 into the rotary drum according to the mass percentage of the wet blue leather, and running for 35min to obtain pre-fatting leather;
step six, dyeing: according to the mass percentage of the wet blue leather, sequentially adding 1.7% of environment-friendly tannin Relugan FS, 1.7% of composite tannin Basyntan FR-BC, 1.2% of Basdan FO, 2.2% of dispersed tannin Tamol FR-DA and 1.1% of ammonia water, simultaneously adding 1.6% of dispersed tannin Tamol FR-DA and dye, running for 65min, discharging liquid and obtaining a dyed leather material, wherein the use amount of the dye is adjusted according to the required color of the leather material;
step seven, primary fixation: adding 130% of water into a rotary drum according to the mass percent of wet blue leather, keeping the water temperature at 45 ℃, adding 0.6% of formic acid, running for 17min, continuously adding 0.6% of formic acid, running for 17min, then adding 0.8% of formic acid, running for 22min, adjusting the pH to 4.0, draining, adding 250% of water, washing for 12min, draining, adding 320% of water, washing for 17min, draining, and thus obtaining the primary fixed leather;
step eight, main greasing: adding 55% of water into a rotary drum according to the mass percentage of wet blue leather, keeping the water temperature at 50 ℃, adding 0.8% of ammonia water, adjusting the pH to 5.5-5.8, running for 25min, adding 9% of waterproof oil Denprodin ENS, 0.6% of dichlolite A oil and 0.2% of preservative MIRECIDE-TC/81.V, running for 95min, and discharging liquid after color matching to obtain the main fatliquoring leather;
step nine, secondary fixation: adding 105% of water into a rotary drum according to the mass percent of wet blue leather, adding 0.4% of formic acid, operating for 17min, adding 0.4% of formic acid, operating for 12min, adding 0.5% of formic acid, operating for 17min, adjusting the pH to 4.0, washing after draining, and draining to obtain secondary fixed leather;
step ten, chromium fixation: adding 120% of water into a rotary drum according to the mass percent of the wet blue leather, adding 0.4% of formic acid, operating for 12min, adding 2.5% of chromium powder, operating for 65min, washing water and discharging from the drum to obtain the leather after chromium fixation;
and step eleven, sequentially pasting the leather subjected to chromium fixation on a plate, drying, softening, buffing, tumbling and spraying color to obtain the oxfordia secondary waterproof leather.
Comparative example
The second layer waterproof leather of a certain brand cattle is sold in the market.
The leather of the example 1 of the present invention and the leather of the comparative example were subjected to the performance test, and the results are shown in the following table 1:
table 1 results of performance testing
The above table shows that the cattle second-layer waterproof leather prepared by the invention has excellent waterproofness and wear resistance, and meanwhile, the cattle second-layer waterproof leather prepared by the invention has plump and soft hand feeling.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. The manufacturing method of the cattle second-layer waterproof leather is characterized by comprising the following steps:
and (3) sequentially carrying out rewetting → retanning → alkali extraction → neutralization → pre-fatliquoring → dyeing → primary fixing → main fatliquoring → secondary fixing → chromium fixing → veneer → drying → softening → buffing → drum throwing → color spraying on the wet blue leather to obtain the waterproof leather with the ox II layer.
2. The manufacturing method of the oxfordia waterproof leather according to claim 1, comprising the following steps:
step one, rewetting: putting wet blue leather into a rotary drum, adding 150-250% of water according to the mass percentage of the wet blue leather, keeping the water temperature at 40-50 ℃, adding 0.8-1.2% of fatty aldehyde, operating for 55-65min, adding 0.08-0.12% of soda ash and 0.2-0.4% of degreasing agent, operating for 55-65min, adding 0.2-0.4% of formic acid and 0.5-0.7% of oxalic acid, operating for 55-65min, draining, adding 150-250% of water, washing for 8-12min, draining, and obtaining the wet leather material;
step two, retanning: adding 75-85% of water and 0.3-0.7% of formic acid into a rotary drum according to the mass percentage of the wet blue leather, adjusting the pH to 2.8-3.2, running for 35-45min, adding 3.5-4.5% of chromium powder and 1.8-2.2% of white tannin, running for 115-125min, adding 1.8-2.2% of fatty aldehyde, running for 55-65min, draining liquid, and obtaining retanning leather material;
step three, alkali extraction: according to the mass percent of wet blue leather, adding 45-55% of water and 0.9-1.1% of sodium formate into a rotary drum, running for 25-35min, adding 0.4-0.6% of baking soda, controlling the pH to be 4.0, running for 25-35min, draining, adding 95-105% of water, draining, and obtaining the alkali extracting leather material;
step four, neutralizing: adding 115-125% of water, 2-3% of sodium formate and 1.5-2.5% of neutralized tannin into a rotary drum according to the mass percentage of wet blue leather, operating for 35-45min, simultaneously adding 0.8-1.2% of baking soda and 0.8-1.2% of waterproof oil, then adding 0.4-0.6% of ammonium bicarbonate and 0.5-0.7% of sodium sulfite, operating for 115-125min, draining, adding 150-250% of water, washing for 8-12min, draining to obtain neutralized leather;
step five, pre-greasing: adding 0.8-1.2% of fatting agent into the rotary drum according to the mass percent of the wet blue leather, and running for 25-35min to obtain pre-fatting leather;
step six, dyeing: according to the mass percentage of the wet blue leather, sequentially adding 1.3% -1.7% of environment-friendly tannin, 1.3% -1.7% of composite tannin, 0.8% -1.2% of Basdan FO, 1.8% -2.2% of dispersed tannin and 0.9% -1.1% of ammonia water, simultaneously adding 1.4% -1.6% of dispersed tannin and dye, running for 55-65min, discharging liquid to obtain a dyed leather material, wherein the dye dosage is adjusted according to the required color of the leather material;
step seven, primary fixation: according to the mass percentage of the wet blue leather, adding 110-130% of water into a rotary drum, keeping the water temperature at 35-45 ℃, adding 0.4-0.6% of formic acid, operating for 13-17min, continuously adding 0.4-0.6% of formic acid, operating for 13-17min, then adding 0.6-0.8% of formic acid, operating for 18-22min, adjusting the pH to 4.0, draining, adding 150-250% of water, washing for 8-12min, draining, adding 280-320% of water, washing for 13-17min, draining, and obtaining the primary fixed leather;
step eight, main greasing: adding 45-55% of water into a rotary drum according to the mass percent of wet blue leather, keeping the water temperature at 40-50 ℃, adding 0.6-0.8% of ammonia water, adjusting the pH to 5.5-5.8, running for 15-25min, adding 8-9% of waterproof oil Densodrin ENS, 0.4-0.6% of dichlofluazurin A oil and 0.1-0.2% of preservative, running for 85-95min, and discharging liquid after color matching to obtain the main fatted leather;
step nine, secondary fixation: according to the mass percent of wet blue leather, adding 95-105% of water into a rotary drum, adding 0.2-0.4% of formic acid, operating for 13-17min, adding 0.2-0.4% of formic acid, operating for 8-12min, adding 0.3-0.5% of formic acid, operating for 13-17min, adjusting the pH value to 4.0, washing water after draining, and draining liquid again to obtain secondary fixed leather;
step ten, chromium fixation: according to the mass percent of the wet blue leather, adding 110-120% of water into a rotary drum, adding 0.2-0.4% of formic acid, operating for 8-12min, adding 1.5-2.5% of chromium powder, operating for 55-65min, washing water, and discharging from the drum to obtain the leather after chromium fixation;
and step eleven, sequentially pasting the leather subjected to chromium fixation on a plate, drying, softening, buffing, tumbling and spraying color to obtain the oxfordia secondary waterproof leather.
3. The method for manufacturing the bovine second-layer waterproof leather according to claim 1, wherein in the first step, the fatty aldehyde is fatty aldehyde TJ-R706, and the degreasing agent is a degreasing agent PASTOSOL B.
4. The method for making bovine two-layer waterproof leather according to claim 1, wherein in the second step, the white tannin is white tannin TJ-R776, and the fatty aldehyde is TJ-R706.
5. The method for making cow two-layer waterproof leather according to claim 1, wherein the neutral tannin is Neutrigan and the waterproof oil is Denscodrin ENS in step four.
6. The method for manufacturing the ox-II layer waterproof leather according to claim 1, wherein the fatting agent in the fifth step is TJ-F9311.
7. The method for manufacturing the cattle second-layer waterproof leather according to claim 1, wherein in the sixth step, the environment-friendly tannin is Relugan FS, the composite tannin is Basyntan FR-BC, and the dispersed tannin is Tamol FR-DA.
8. The method for making bovine two-layer waterproof leather according to claim 1, wherein the preservative in step eight is MIRECIDE-TC/81. V.
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| CN116004930A (en) * | 2023-02-27 | 2023-04-25 | 峰安皮业股份有限公司 | Manufacturing process of environment-friendly wear-resistant PU (polyurethane) cattle two-layer leather |
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| CN107502685A (en) * | 2017-10-25 | 2017-12-22 | 漳州香洲皮革有限公司 | The preparation method of water-fastness cow split leather |
| CN107523655A (en) * | 2017-10-25 | 2017-12-29 | 漳州香洲皮革有限公司 | A kind of production technology of color inhibition light shine double-layer fur |
| CN107641667A (en) * | 2017-10-25 | 2018-01-30 | 漳州香洲皮革有限公司 | Environment-friendly waterproof is without dissolution chromium cow split leather and preparation method thereof |
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| CN107502685A (en) * | 2017-10-25 | 2017-12-22 | 漳州香洲皮革有限公司 | The preparation method of water-fastness cow split leather |
| CN107523655A (en) * | 2017-10-25 | 2017-12-29 | 漳州香洲皮革有限公司 | A kind of production technology of color inhibition light shine double-layer fur |
| CN107641667A (en) * | 2017-10-25 | 2018-01-30 | 漳州香洲皮革有限公司 | Environment-friendly waterproof is without dissolution chromium cow split leather and preparation method thereof |
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| CN116004930B (en) * | 2023-02-27 | 2024-01-05 | 峰安皮业股份有限公司 | Manufacturing process of environment-friendly wear-resistant PU (polyurethane) cattle two-layer leather |
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