CN110760628A - Method for making light-color-series cattle second-layer leather - Google Patents
Method for making light-color-series cattle second-layer 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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Abstract
The invention discloses a method for manufacturing a light bright-color-series cattle second-layer leather, and belongs to the technical field of leather. The invention relates to a method for manufacturing a light bright color system cattle second-layer leather, which comprises the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying. The light bright color system bovine second-layer leather prepared by the method has bright color, high surface smoothness, high tensile strength, high color fastness and strong yellowing resistance.
Description
Technical Field
The invention belongs to the technical field of leather, and particularly relates to a method for manufacturing a light bright color series cattle second-layer leather.
Background
Along with the development of society, the living standard of people is gradually improved, and people have higher and higher taste and higher requirements on clothes, eating and housing. Particularly leather products, are not only required to have traditional durability, but also required to have visual effects, whether the leather products belong to the current popular styles, whether the colors are gorgeous and the like.
Wherein, the two layers of wet blue leather are tanned by chromium powder, so the wet blue leather has blue-green color, if the wet blue leather needs to be dyed with white and bright color, the whiteness and the brightness of the color can not be achieved due to the color of the blue leather. Therefore, it is necessary to develop a method for preparing wet blue-coated leather with excellent whiteness and brilliance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preparation method of wet blue with two layers and excellent whiteness and brilliance.
The invention adopts the following technical scheme:
the method for manufacturing the light bright color series cattle second-layer leather comprises the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying.
The method for manufacturing the light brilliant color series cattle second-layer leather comprises the following specific steps:
step one, primary rewetting:
putting leather into a rotary drum, putting 200-230% of water, 0.5-0.7% of degreasing agent and 0.5-0.8% of moisture regaining agent into the rotary drum according to the mass percentage of the leather, operating the rotary drum for 60-90 min, then putting 1.5-1.8% of ammonium sulfate and 1-1.1% of acid softening enzyme into the rotary drum, operating the rotary drum for 120-150 min, then putting 0.3-0.4% of formic acid and 0.6-0.8% of oxalic acid into the rotary drum, operating the rotary drum for 60-90 min, draining, finally adding 300-350% of water, washing and draining to obtain primary moisture regaining leather;
step two, primary retanning:
according to the mass percentage of the leather, 100-120% of water and 0.5-0.8% of potassium permanganate are put into a rotary drum, the rotary drum operates for 30-60 min, then 1.5-2.0% of sodium metabisulfite and 1-2% of oxalic acid are put into the rotary drum, the rotary drum operates for 60-90 min, and then washing and draining are carried out to obtain the primary retanning leather;
then, according to the mass percentage of the leather, 100-130% of water and 0.5-0.8% of formic acid are put into a rotary drum, the rotary drum operates for 40-60 min, the pH value is 2.8-3.2, then 2-3% of chromium powder AB is put into the rotary drum, the rotary drum operates for 60-90 min, then 1.6-2% of retanning agent is put into the rotary drum, and the rotary drum operates for 60-90 min, so that the once retanned leather is obtained;
step three, primary neutralization:
putting 2-2.3% of tannin into the rotary drum according to the mass percentage of the leather, continuously operating the rotary drum for 60-90 min, and then draining water to obtain neutralized leather;
step four, alkali extraction:
according to the mass percentage of the leather, 50-100% of water and 1.5-1.8% of sodium formate are put into a rotary drum, the rotary drum runs for 30-60 min, then 0.3-0.6% of sodium bicarbonate is added, the rotary drum runs for 30-60 min, then 0.5-0.8% of sodium bicarbonate is added, the rotary drum runs for 30-60 min, the pH value is adjusted to 3.8-4.3, then water is drained, and water is absorbed, so that the alkali-extracting leather is obtained;
step five, secondary neutralization:
adding 120-150% of water and 1.5-1.8% of sodium formate into a rotary drum according to the mass percentage of the leather, and obtaining secondary neutralized leather after the rotary drum operates;
step six, secondary retanning:
adding 1-1.3% of tannin, 1.5-1.8% of sodium acetate, 0.5-0.9% of titanium dioxide and 2-3% of neutralized tannin into a rotary drum according to the mass percentage of the leather, running for 60-90 min, then adding 1-1.2% of baking soda, 0.5-0.8% of ammonium bicarbonate and 0.5-0.9% of sodium sulfite into the rotary drum, running for 120-150 min, adjusting the pH value to 5.8-6.2, then washing, and finally draining to obtain secondary retanning leather;
step seven, post-processing:
and (4) dyeing, fatliquoring, fixing color, pasting a plate, drying, softening, grinding, tumbling and spraying color on the secondary retanned leather obtained in the sixth step to obtain the light brilliant color system oxhide II skin.
Further, the degreasing agent in the first step is: the PASTOSOL B degreaser from Topule chemical dyes (Jiaxing) Co., Ltd.
The moisture regaining agent is: STOSOL W available from Toeplier chemical dye (Jiaxing) Inc.
The acid softening enzyme is: acid softening enzyme TJ-A488 prepared by Sichuan Tingjiang New materials GmbH.
Further, the retanning agent in the step two is a multi-metal retanning agent TJ-R104 prepared by Sichuan Tingjiang New Material Co.
Further, the tannin in the third step is a trupotandgd substitute tannin made by thopler chemical dye (jiaxing) limited.
Further, the tannin in step six is a trupotandd substitute tannin made by thopler chemical dye (jiaxing) limited, and the neutralized tannin is basdan SL of basf.
Compared with the prior art, the invention has the following beneficial effects:
firstly, in the primary rewetting process, the degreasing effect can be effectively improved after the PASOSOL B degreasing agent of the Thompler chemical dye (Jiaxing) company and the PASOSOL W of the Thompler chemical dye (Jiaxing) company are mixed and used, and meanwhile, the leather can be effectively softened by the acid softening enzyme TJ-A488 prepared by the New Material company of Sichuan Tejiang, which is helpful for improving the subsequent dyeing effect, so that the produced leather has clean and bright color;
secondly, during one-time retanning, the leather is treated by potassium permanganate, sodium metabisulfite and oxalic acid, and then the leather is treated by a multi-metal retanning agent TJ-R104 of New Material GmbH, Sichuan Tenjiang, so that the grain surface of the leather is fine, the leather body is soft and compact, and the binding property with leather collagen is better. In the secondary retanning process, TRUPOTAN GD alternative tannin prepared by Toeplier chemical dye (Jiaxing) limited company and Pasdan SL of Pasfu (China) limited company as neutralization tannin are mixed for use, so that the fullness of leather can be effectively increased, particularly the fullness of the sides and the abdomens with loose structures is increased, the compactness of grain surfaces is improved, the levelness is realized, the dyeing depth is not reduced, and the gorgeous degree of the leather color is improved.
Detailed Description
The raw materials used in the invention are all commercial products.
Example 1
The method for manufacturing the light bright color series cattle second-layer leather comprises the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying.
The manufacturing method of the light brilliant color series cattle second-layer leather comprises the following specific steps:
step one, primary rewetting:
putting leather into a rotary drum, putting 200% of water, 0.5% of degreasing agent and 0.5% of rewetting agent into the rotary drum according to the mass percentage of the leather, running the rotary drum for 60min, then putting 1.5% of ammonium sulfate and 1% of acid softening enzyme into the rotary drum, running the rotary drum for 120min, then putting 0.3% of formic acid and 0.6% of oxalic acid into the rotary drum, running the rotary drum for 60min, then draining, finally adding 300% of water, washing and draining to obtain primary rewetting leather;
step two, primary retanning:
according to the mass percentage of the leather, 100 percent of water and 0.5 percent of potassium permanganate are put into a rotary drum, the rotary drum runs for 30min, then 1.5 percent of sodium metabisulfite and 1 percent of oxalic acid are put into the rotary drum, the rotary drum runs for 60min, and then washing and draining are carried out to obtain the primary retanning leather;
then, according to the mass percentage of the leather, 100% of water and 0.5% of formic acid are put into a rotary drum, the rotary drum runs for 40min, the pH value is 2.8, 2% of chromium powder AB is put into the rotary drum, the rotary drum runs for 60min, finally 1.6% of retanning agent is put into the rotary drum, and the rotary drum runs for 60min, so that the once retanned leather is obtained;
step three, primary neutralization:
putting 2% of tannin into a rotary drum according to the mass percentage of the leather, continuously running the rotary drum for 60min, and then draining to obtain neutralized leather;
step four, alkali extraction:
according to the mass percentage of the leather, 50% of water and 1.5% of sodium formate are put into a rotary drum, the rotary drum runs for 30min, then 0.3% of baking soda is added, the rotary drum runs for 30min, then 0.5% of baking soda is added, the rotary drum runs for 30min, the pH value is adjusted to 3.8, then water is drained, and water is absorbed, so that the alkali-extracting leather is obtained;
step five, secondary neutralization:
adding 120% of water and 1.5% of sodium formate into a rotary drum according to the mass percentage of the leather, and obtaining secondary neutralized leather after the rotary drum runs;
step six, secondary retanning:
adding 1% of tannin, 1.5% of sodium acetate, 0.5% of titanium dioxide and 2% of neutralized tannin into a rotary drum according to the mass percentage of the leather, running for 60min, then adding 1% of sodium bicarbonate, 0.5% of ammonium bicarbonate and 0.5% of sodium sulfite into the rotary drum, running for 120min, adjusting the pH value to 5.8, then washing, and finally draining to obtain secondary retanning leather;
step seven, post-processing:
and (4) dyeing, fatliquoring, fixing color, pasting a plate, drying, softening, grinding, tumbling and spraying color on the secondary retanned leather obtained in the sixth step to obtain the light brilliant color system oxhide II skin.
Example 2
The method for manufacturing the light bright color series cattle second-layer leather comprises the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying.
The manufacturing method of the light brilliant color series cattle second-layer leather comprises the following specific steps:
step one, primary rewetting:
putting leather into a rotary drum, putting 210% of water, 0.6% of degreasing agent and 0.6% of rewetting agent into the rotary drum according to the mass percentage of the leather, running the rotary drum for 70min, then putting 1.6% of ammonium sulfate and 1.1% of acid softening enzyme into the rotary drum, running the rotary drum for 130min, then putting 0.4% of formic acid and 0.7% of oxalic acid into the rotary drum, running the rotary drum for 70min, then draining, and finally adding 310% of water for washing and draining to obtain primary rewetting leather;
step two, primary retanning:
according to the mass percentage of the leather, 110 percent of water and 0.6 percent of potassium permanganate are put into a rotary drum, the rotary drum runs for 40min, then 1.6 percent of sodium metabisulfite and 1.2 percent of oxalic acid are put into the rotary drum, the rotary drum runs for 70min, and then washing and draining are carried out to obtain the once-retanned leather;
then, according to the mass percentage of the leather, 110% of water and 0.6% of formic acid are put into a rotary drum, the rotary drum runs for 50min, the pH value is 2.9, 2.2% of chromium powder AB is put into the rotary drum, the rotary drum runs for 70min, finally 1.7% of retanning agent is put into the rotary drum, and the rotary drum runs for 70min, so that the once retanned leather is obtained;
step three, primary neutralization:
putting 2.1% of tannin into a rotary drum according to the mass percentage of the leather, continuously running the rotary drum for 70min, and then draining water to obtain neutralized leather;
step four, alkali extraction:
according to the mass percentage of the leather, 60% of water and 1.6% of sodium formate are put into a rotary drum, the rotary drum runs for 40min, then 0.4% of baking soda is added, the rotary drum runs for 40min, then 0.6% of baking soda is added, the rotary drum runs for 40min, the pH value is adjusted to 3.9, then water is drained, and water is absorbed, so that the alkali-extracting leather is obtained;
step five, secondary neutralization:
adding 130% of water and 1.6% of sodium formate into a rotary drum according to the mass percentage of the leather, and obtaining secondary neutralized leather after the rotary drum runs;
step six, secondary retanning:
adding 2% of tannin, 1.6% of sodium acetate, 0.6% of titanium dioxide and 3% of neutralized tannin into a rotary drum according to the mass percentage of the leather, running for 70min, then adding 1.1% of sodium bicarbonate, 0.6% of ammonium bicarbonate and 0.6% of sodium sulfite into the rotary drum, running for 130min, adjusting the pH value to 5.9, then washing, and finally draining to obtain secondary retanning leather;
step seven, post-processing:
and (4) dyeing, fatliquoring, fixing color, pasting a plate, drying, softening, grinding, tumbling and spraying color on the secondary retanned leather obtained in the sixth step to obtain the light brilliant color system oxhide II skin.
Example 3
The method for manufacturing the light bright color series cattle second-layer leather comprises the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying.
The manufacturing method of the light brilliant color series cattle second-layer leather comprises the following specific steps:
step one, primary rewetting:
putting leather into a rotary drum, putting 220% of water, 0.7% of degreasing agent and 0.7% of rewetting agent into the rotary drum according to the mass percentage of the leather, operating the rotary drum for 80min, then putting 1.7% of ammonium sulfate and 1.1% of acid softening enzyme into the rotary drum, operating the rotary drum for 140min, then putting 0.4% of formic acid and 0.7% of oxalic acid into the rotary drum, operating the rotary drum for 80min, then draining, and finally adding 340% of water for washing and draining to obtain primary rewetting leather;
step two, primary retanning:
according to the mass percentage of the leather, 110 percent of water and 0.7 percent of potassium permanganate are put into a rotary drum, the rotary drum runs for 50min, then 1.8 percent of sodium metabisulfite and 1.8 percent of oxalic acid are put into the rotary drum, the rotary drum runs for 80min, and then washing and draining are carried out to obtain the once-retanned leather;
then, according to the mass percentage of the leather, 120% of water and 0.7% of formic acid are put into a rotary drum, the rotary drum runs for 50min, the pH value is 3.1, 2.8% of chromium powder AB is put into the rotary drum, the rotary drum runs for 80min, finally 1.8% of retanning agent is put into the rotary drum, and the rotary drum runs for 80min, so that the once retanned leather is obtained;
step three, primary neutralization:
putting 2.2% of tannin into a rotary drum according to the mass percentage of the leather, continuously running the rotary drum for 80min, and then draining water to obtain neutralized leather;
step four, alkali extraction:
according to the mass percentage of the leather, 80% of water and 1.7% of sodium formate are put into a rotary drum, the rotary drum runs for 50min, then 0.5% of baking soda is added, the rotary drum runs for 50min, then 0.7% of baking soda is added, the rotary drum runs for 50min, the pH value is adjusted to 4.2, then water is drained, and water is absorbed, so that the alkali-extracting leather is obtained;
step five, secondary neutralization:
adding 140% of water and 1.7% of sodium formate into a rotary drum according to the mass percentage of the leather, and obtaining secondary neutralized leather after the rotary drum runs;
step six, secondary retanning:
adding 1.2% of tannin, 1.7% of sodium acetate, 0.8% of titanium dioxide and 2.8% of neutralized tannin into a rotary drum according to the mass percentage of the leather, running for 80min, then adding 1.2% of sodium bicarbonate, 0.7% of ammonium bicarbonate and 0.8% of sodium sulfite into the rotary drum, running for 140min, adjusting the pH to 6.0, then washing, and finally draining to obtain secondary retanning leather;
step seven, post-processing:
and (4) dyeing, fatliquoring, fixing color, pasting a plate, drying, softening, grinding, tumbling and spraying color on the secondary retanned leather obtained in the sixth step to obtain the light brilliant color system oxhide II skin.
Example 4
The method for manufacturing the light bright color series cattle second-layer leather comprises the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying.
The manufacturing method of the light brilliant color series cattle second-layer leather comprises the following specific steps:
step one, primary rewetting:
putting leather into a rotary drum, putting 230% of water, 0.7% of degreasing agent and 0.8% of rewetting agent into the rotary drum according to the mass percentage of the leather, operating the rotary drum for 90min, then putting 1.8% of ammonium sulfate and 1.1% of acid softening enzyme into the rotary drum, operating the rotary drum for 150min, then putting 0.4% of formic acid and 0.8% of oxalic acid into the rotary drum, operating the rotary drum for 90min, then draining, and finally adding 350% of water for washing and draining to obtain primary rewetting leather;
step two, primary retanning:
according to the mass percentage of the leather, 120% of water and 0.8% of potassium permanganate are put into a rotary drum, the rotary drum runs for 60min, then 2.0% of sodium metabisulfite and 2% of oxalic acid are put into the rotary drum, the rotary drum runs for 90min, and then washing and draining are carried out to obtain the primary retanning leather;
then, according to the mass percentage of the leather, 130 percent of water and 0.8 percent of formic acid are put into a rotary drum, the rotary drum runs for 60min, the pH value is 3.2, then 3 percent of chromium powder AB is put into the rotary drum, the rotary drum runs for 90min, finally 2 percent of retanning agent is put into the rotary drum, and the rotary drum runs for 90min, so that the once retanned leather is obtained;
step three, primary neutralization:
putting 2.3 percent of tannin into a rotary drum according to the mass percent of the leather, continuously operating the rotary drum for 90min, and then draining water to obtain neutralized leather;
step four, alkali extraction:
according to the mass percentage of the leather, 100% of water and 1.8% of sodium formate are put into a rotary drum, the rotary drum runs for 60min, then 0.6% of baking soda is added, the rotary drum runs for 60min, then 0.8% of baking soda is added, the rotary drum runs for 60min, the pH value is adjusted to 4.3, then water is drained, and water is absorbed, so that the alkali-extracting leather is obtained;
step five, secondary neutralization:
adding 150% of water and 1.8% of sodium formate into a rotary drum according to the mass percentage of the leather, and obtaining secondary neutralized leather after the rotary drum operates;
step six, secondary retanning:
adding 1.3% of tannin, 1.8% of sodium acetate, 0.9% of titanium dioxide and 3% of neutralized tannin into a rotary drum according to the mass percentage of the leather, operating for 90min, then adding 1.2% of sodium bicarbonate, 0.8% of ammonium bicarbonate and 0.9% of sodium sulfite into the rotary drum, operating for 150min, adjusting the pH value to 6.2, then washing, and finally draining to obtain secondary retanning leather;
step seven, post-processing:
and (4) dyeing, fatliquoring, fixing color, pasting a plate, drying, softening, grinding, tumbling and spraying color on the secondary retanned leather obtained in the sixth step to obtain the light brilliant color system oxhide II skin.
The performance of the light bright color system cattle second-layer leather prepared in the embodiments 1-4 of the invention is tested, wherein:
firstly, detecting the water splashing prevention performance:
carrying out a water-splashing prevention test by using a water-wetting degree tester GT-7033N;
note that:
1.1 and 250mL of water must be sprayed within 25-30 s;
1.2, forming an angle of 45 degrees on a horizontal plane by the sample bracket;
1.3, keeping a distance of 152.4mm between the center of the lower surface of the nozzle and the center of the surface of the sample;
1.4, during the test, the hand is prevented from being released from the detection instrument, so that the experimental result is not influenced.
Secondly, a softness testing method comprises the following steps:
sampling according to the sampling mode of ISO 2418-;
thirdly, testing color fastness:
color fastness test was performed by using a manual crocking decolorant GT-7034-B manufactured by Goodywell detection instruments (Qingdao) Co., Ltd.;
fourthly, testing the abrasion performance:
the leather abrasion test is carried out by an universal abrasion tester GT-7012-S manufactured by Shenzhen Yinfei electronic technology Limited;
fifthly, tension testing:
the tension test is carried out by a tension tester GT-7010-EP sold by Shandong Ziquan apparatus sales center.
Sixthly, testing yellowing resistance:
and (4) carrying out a yellowing resistance test by a yellowing resistance tester.
The light brilliant color system bovine split leather obtained in the embodiments 1 to 4 of the invention is detected by a tensile testing machine, a yellowing resistance testing machine and a universal abrasion testing machine, and the detection results are shown in the following table 1;
table 1: the results of the detection of the second layer of the seven pale bright color cow skins prepared in examples 1 to 4 were as follows:
as can be seen from Table 1, the light bright color system bovine double-layered skin prepared by the preparation method of the invention has high surface smoothness, high tensile strength, high color fastness and strong yellowing resistance, and the color is bright when an observer watches the product by naked eyes.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (6)
1. The manufacturing method of the light brilliant color series cattle second-layer leather is characterized by comprising the following steps: primary rewetting, secondary rewetting, primary neutralizing, alkali extracting, secondary neutralizing, secondary retanning, washing, dyeing, fatliquoring, color fixing, plate pasting, drying, softening, buffing, drum throwing and color spraying.
2. The method for making a light bright-color bovine bilayer skin according to claim 1 is characterized by comprising the following steps:
step one, primary rewetting:
putting leather into a rotary drum, putting 200-230% of water, 0.5-0.7% of degreasing agent and 0.5-0.8% of moisture regaining agent into the rotary drum according to the mass percentage of the leather, operating the rotary drum for 60-90 min, then putting 1.5-1.8% of ammonium sulfate and 1-1.1% of acid softening enzyme into the rotary drum, operating the rotary drum for 120-150 min, then putting 0.3-0.4% of formic acid and 0.6-0.8% of oxalic acid into the rotary drum, operating the rotary drum for 60-90 min, draining, finally adding 300-350% of water, washing and draining to obtain primary moisture regaining leather;
step two, primary retanning:
according to the mass percentage of the leather, 100-120% of water and 0.5-0.8% of potassium permanganate are put into a rotary drum, the rotary drum operates for 30-60 min, then 1.5-2.0% of sodium metabisulfite and 1-2% of oxalic acid are put into the rotary drum, the rotary drum operates for 60-90 min, and then washing and draining are carried out to obtain the primary retanning leather;
then, according to the mass percentage of the leather, 100-130% of water and 0.5-0.8% of formic acid are put into a rotary drum, the rotary drum operates for 40-60 min, the pH value is 2.8-3.2, then 2-3% of chromium powder AB is put into the rotary drum, the rotary drum operates for 60-90 min, finally 1.6-2% of retanning agent is put into the rotary drum, and the rotary drum operates for 60-90 min, so that the once retanned leather is obtained;
step three, primary neutralization:
putting 2-2.3% of tannin into the rotary drum according to the mass percentage of the leather, continuously operating the rotary drum for 60-90 min, and then draining water to obtain neutralized leather;
step four, alkali extraction:
according to the mass percentage of the leather, 50-100% of water and 1.5-1.8% of sodium formate are put into a rotary drum, the rotary drum runs for 30-60 min, then 0.3-0.6% of sodium bicarbonate is added, the rotary drum runs for 30-60 min, then 0.5-0.8% of sodium bicarbonate is added, the rotary drum runs for 30-60 min, the pH value is adjusted to 3.8-4.3, then water is drained, and water is absorbed, so that the alkali-extracting leather is obtained;
step five, secondary neutralization:
adding 120-150% of water and 1.5-1.8% of sodium formate into a rotary drum according to the mass percentage of the leather, and obtaining secondary neutralized leather after the rotary drum operates;
step six, secondary retanning:
adding 1-1.3% of tannin, 1.5-1.8% of sodium acetate, 0.5-0.9% of titanium dioxide and 2-3% of neutralized tannin into a rotary drum according to the mass percentage of the leather, running for 60-90 min, then adding 1-1.2% of baking soda, 0.5-0.8% of ammonium bicarbonate and 0.5-0.9% of sodium sulfite into the rotary drum, running for 120-150 min, adjusting the pH value to 5.8-6.2, then washing, and finally draining to obtain secondary retanning leather;
step seven, post-processing:
and (4) dyeing, fatliquoring, fixing color, pasting a plate, drying, softening, grinding, tumbling and spraying color on the secondary retanned leather obtained in the sixth step to obtain the light brilliant color system oxhide II skin.
3. The method for manufacturing the ox second-layer skin with light color system according to claim 2, wherein the degreasing agent in the first step is: the padosol B degreaser from thopler chemical dyes (carx) ltd;
the moisture regaining agent is: padosol W from thopler chemical dye (carx) ltd;
the acid softening enzyme is: acid softening enzyme TJ-A488 prepared by Sichuan Tingjiang New materials GmbH.
4. The method for preparing a light bright-color cattle hide as claimed in claim 2, wherein the retanning agent in step two is a multi-metal retanning agent TJ-R104 prepared by Sichuan Tenjiang New materials GmbH.
5. The method of claim 2, wherein the tannin is a TRUPOTAN GD substitute tannin from thopler chemical dye (carxing) limited.
6. The method as claimed in claim 2, wherein the tannin is a TRUPOTAN GD substitute tannin from thopler chemical dye (carxing) limited, and the neutral tannin is basdan SL from basf.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112063776A (en) * | 2020-09-12 | 2020-12-11 | 漳州香洲皮革有限公司 | Manufacturing method for enhancing tearing force of two-layer anti-velvet leather |
| CN112063778A (en) * | 2020-09-12 | 2020-12-11 | 漳州香洲皮革有限公司 | Manufacturing method for improving blackness and physical properties of black 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 |
| CN108251572A (en) * | 2018-02-09 | 2018-07-06 | 漳州香洲皮革有限公司 | The production method of mildew proof leather |
| CN108330226A (en) * | 2018-02-09 | 2018-07-27 | 漳州香洲皮革有限公司 | The production method of fire prevention 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 |
| CN108251572A (en) * | 2018-02-09 | 2018-07-06 | 漳州香洲皮革有限公司 | The production method of mildew proof leather |
| CN108330226A (en) * | 2018-02-09 | 2018-07-27 | 漳州香洲皮革有限公司 | The production method of fire prevention leather |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112063776A (en) * | 2020-09-12 | 2020-12-11 | 漳州香洲皮革有限公司 | Manufacturing method for enhancing tearing force of two-layer anti-velvet leather |
| CN112063778A (en) * | 2020-09-12 | 2020-12-11 | 漳州香洲皮革有限公司 | Manufacturing method for improving blackness and physical properties of black leather |
| CN112063776B (en) * | 2020-09-12 | 2022-03-25 | 漳州香洲皮革有限公司 | Manufacturing method for enhancing tearing force of two-layer anti-velvet leather |
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