CN109576411B - Sturgeon leather degreasing method - Google Patents
Sturgeon leather degreasing method Download PDFInfo
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- CN109576411B CN109576411B CN201811505949.1A CN201811505949A CN109576411B CN 109576411 B CN109576411 B CN 109576411B CN 201811505949 A CN201811505949 A CN 201811505949A CN 109576411 B CN109576411 B CN 109576411B
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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
- C14B—MECHANICAL TREATMENT OR PROCESSING OF SKINS, HIDES OR LEATHER IN GENERAL; PELT-SHEARING MACHINES; INTESTINE-SPLITTING MACHINES
- C14B17/00—Details of apparatus or machines for manufacturing or treating skins, hides, leather, or furs
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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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Abstract
The invention belongs to the field of leather processing, and particularly discloses a sturgeon leather degreasing method, aiming at the fat distribution characteristics of sturgeon leather, different degreasing agents and degreasing methods are selected to perform degreasing respectively on different grease components in different tanning procedures, so that the degreased sturgeon leather is clean and tidy, meets the dyeing requirements of sturgeon leather with various colors, and is full and gorgeous in color; the tanned and degreased leather is detected to be lead-free, and meanwhile, 168 high concern Substances (SVHC) are screened and tested, so that the substance concentration is less than 0.1 percent, and the tanned and degreased leather is easy to popularize in a large scale in the market.
Description
Technical Field
The invention belongs to the field of leather processing, and particularly relates to a sturgeon leather degreasing method.
Background
Sturgeons are rare ancient fishes left in middle generations one hundred million years ago, the body surfaces of the sturgeons are covered with bone plates arranged in five rows in a longitudinal mode, patterns are three-dimensional and unique, the sturgeon bone plates are high-quality materials for making high-grade leather, however, because rich fat tissues are arranged in the middle of the combination parts of the sturgeon bone plates and fish skins, the fat in the sturgeon bone plates is difficult to be removed by a common degreasing technology in the process of tanning the sturgeon leather, the quality of the sturgeon leather is seriously influenced, and the development and application of the sturgeon leather are limited.
According to published academic papers or patents, the degreasing method adopted by the method can not well degrease sturgeon leather through repeated argumentation, and is mainly characterized in that grease in sturgeon leather can not be thoroughly degreased at the connecting part of a sturgeon back bone plate and the leather, the connecting part of a sturgeon abdomen bone plate and the leather, pectoral fins, ventral fins, dorsal fins and other parts, if the degreasing is not completely finished, the leather is stiff in the later tanning process, the filled material can not be filled in, the dyeing is not uniform, the material is not filled uniformly, the leather part is obviously poor, the thickness is inconsistent, and the quality of the sturgeon leather is seriously affected.
Disclosure of Invention
The invention aims to provide a sturgeon leather degreasing method which is simple, successfully solves the technical problem of incomplete degreasing in the sturgeon leather tanning process, improves the tanning quality of the sturgeon leather, has soft and plump leather, and can meet the tanning processing requirements of sturgeon leather of various styles.
In order to achieve the purpose, the invention adopts the following technical measures:
1. a sturgeon leather degreasing method comprises the following steps:
1) pre-degreasing
(1) Fully washing sturgeon skin at the water temperature of 18-22 ℃, and weighing after washing;
(2) weighing 200-300% of water, 1-1.5% of water-soaking agent, 0.5-1% of bactericide and 1-1.5% of degreasing agent in the weight of the sturgeon skin obtained in the step (1)
(3) Mixing the raw materials weighed in the steps 1) and 2) with the sturgeon skin, keeping the water temperature at 20-22 ℃, rotating the drum for 10-20 minutes, stopping for 40-50 minutes, rotating the drum for 3-5 revolutions per minute, and setting the time for 36 hours;
2) mechanical degreasing
Fixing the sturgeon skin and flesh side which is soaked in water on a panel, removing fins by using scissors, and removing fish and fat by using a steel wire brush or a nylon brush;
3) liming and degreasing
(1) Step 2), weighing sturgeon skin obtained after mechanical degreasing;
(2) weighing 1.5-3% of sodium sulfide (the sodium sulfide is sodium sulfide particles with effective content of 50-60%), 8-10% of lime, 0.5-1% of liming auxiliary agent, 1-2% of degreasing agent and 300-400% of water by weight of the sturgeon skin in the step 3) (1);
(3) putting water and sturgeon skin into a rotary drum, adjusting the water temperature to 22-24 ℃, adding sodium sulfide and a degreasing agent, rotating for 50-70 minutes, and rotating for 3-5 revolutions per minute; adding lime and liming auxiliary agent, rotating for 5-15 minutes and stopping for 40-60 minutes, and rotating the drum for 2-4 revolutions per minute, wherein the total time of the step is 28-44 hours; after the step is completed, the skin of the sturgeon expands uniformly, the skin is firm, and the ph of the skin of the sturgeon is more than 12.
(4) Washing with water, namely fully washing the sturgeon skin with 18-22 ℃ water;
(5) and (3) mechanically removing meat and fat from the washed skin again in the same way as the step 2).
4) Deashing and degreasing
(1) Weighing the sturgeon skin treated in the step 3);
(2) weighing ammonium sulfate which is 1.5-2% of the weight of the sturgeon skin in the step 4) (1), degreasing agent which is 1.5-2% of the weight of the sturgeon skin, and water which is 100-150% of the weight of the sturgeon skin;
(3) adjusting the water temperature, adding sturgeon skin, sequentially adding ammonium sulfate and degreasing agent, keeping the water temperature at 31-34 ℃, rotating for 1.5-2.5h at 3-5 r/min; phenolphthalein indicators show cuts 1/5-1/6 showing a red heart, indicating that deliming is in place;
(4) washing, namely fully washing sturgeon skin at the temperature of 30-37 ℃;
5) pickling and degreasing
(1) Weighing the sturgeon skin treated in the step 4);
(2) weighing 150% of water, 16-20% of salt, 1-1.5% of acetic acid, 1.5-2% of concentrated sulfuric acid and 1.5-2% of nonionic degreasing agent in the weight ratio of the sturgeon skin obtained in the step 5) (1);
(3) adjusting the water temperature, adding sturgeon skin, adding the nonionic degreasing agent and the salt, keeping the water temperature at 21-23 ℃, rotating the rotary drum for 5-15 minutes at 2-4 revolutions per minute; then adding diluted acetic acid from a feed inlet, and rotating for 1-3 r/min and 25-40 min; then adding diluted concentrated sulfuric acid from a feed inlet, averagely adding the diluted concentrated sulfuric acid for 4-6 times, wherein each time is 25-35 minutes, the rotating speed is 1-3 revolutions per minute, then stopping the drum and standing, controlling the temperature to be 21-23 ℃, and the time is 28-46 hours from the beginning of adding the nonionic degreasing agent to the end of standing; after the step is finished, the leather surface is astringent, the leather body is flexible and compact, and the pH value of the solution is 2.0-3.0;
(4) degreasing, namely taking the sturgeon skin out in an acid skin state, and removing solid fat again on a dried panel in the same way as the step 2);
6) tanning and degreasing
(1) Weighing the sturgeon skin treated in the step 5), and then putting the sturgeon skin into the pickling solution again;
(2) weighing 2-3% of modified glutaraldehyde, 1-1.5% of aluminum tanning agent, 8-10% of white tannin extract, 1-1.5% of sodium formate, 2-2.5% of baking soda and 1-1.5% of mildew preventive in the weight of the sturgeon skin in the step 6) (1);
(3) tanning
The preparation method comprises the following steps of (1) carrying out the steps in an original pickling solution, keeping the water temperature at 22-26 ℃, adding diluted modified glutaraldehyde, and rotating for 1-2 hours at 2-3 rpm; adding an aluminum tanning agent, and rotating for 1-2 hours at a speed of 2-3 r/min; adding white tannin and tannin extract, and rotating for 3-5h at a speed of 3-4 rpm; stopping the drum, and standing for 8-24 h; after standing, continuously adding sodium formate and a mildew preventive, and rotating for 1-2 hours at a speed of 2-3 rpm; then adding the diluted baking soda, wherein the baking soda is added for 5-8 times on average, and each time is 30-60 minutes and 2-3 revolutions per minute; when the ph of the solution is detected to be 4.0, continuing to rotate for 1.5-2.5h and 2-3 r/min; then, the water temperature is increased to 38-42 ℃, the water temperature is kept, and the rotation time is 1.5-2.5h and 2-3 r/min; detecting the shrinkage temperature of the sturgeon leather by using boiling water at more than 80 ℃, stopping the drum, standing for 8-24h, cleaning in a normal-temperature running water drum for 15-40 min, and taking out the sturgeon leather;
(4) degreasing
Weighing the sturgeon skin treated in the step 6) and the step 3; weighing water accounting for 300% of 200 plus of the weight of the sturgeon skin and a high-temperature resistant non-ionic degreasing agent accounting for 3-4%; putting sturgeon skin, water and the high-temperature-resistant non-ionic degreasing agent into a rotary drum, keeping the water temperature at 58-65 ℃ and rotating for 4-8 hours at 3-5 r/min; taking out the sturgeon skin, and washing for 15-40 minutes at normal temperature by running water.
Compared with the prior art, the invention has the following advantages:
1. the degreased sturgeon leather is clean and tidy, meets the dyeing requirements of sturgeon leather with various colors, and is full and gorgeous in color and luster;
2. adopts a brand new process and is easy to popularize in the market
3. Different degreasing agents and degreasing methods are selected to carry out degreasing respectively on different grease components in different tanning processes.
Drawings
FIG. 1 is a schematic diagram of sturgeon leather that is degreased and unclean;
wherein, a is the degreased clean sturgeon skin embryo by the method of the invention;
b is sturgeon skin embryo treated by the degreasing method in the prior art.
Detailed Description
The technical scheme of the invention is the conventional technology in the field if not particularly stated; the reagents or materials, if not specifically mentioned, are commercially available.
Example 1:
a sturgeon leather degreasing method comprises the following steps of:
according to conventional cognition in the field, the weight of the sturgeon skin related to the invention is the wet weight of the sturgeon skin; the percentage addition amount of the raw materials used in each step is based on the weight of the sturgeon skin involved in each step. The sturgeon skin used in this example was chinese sturgeon (a. sinensis).
1) Pre-degreasing
In the soaking section, the sturgeon skin is pre-degreased, mainly to remove surface grease, and to prepare for the liming section
(1) Fully washing the sturgeon skin for 2 times with 15 minutes each time and 2 revolutions per minute at a water temperature of 18-22 ℃ and a large amount of clear water in the rotary drum, and weighing after the water washing is finished;
(2) weighing 200% of water, 1% of water soaking agent (Pasteur Eusaponw), 1% of bactericide (Cismolan AN 90) and 1% of degreasing agent (brother chemical H900) according to the weight of the sturgeon skin obtained in the step (1)
(3) Mixing the raw materials weighed in the steps 1) and 2) with the sturgeon skin, keeping the water temperature at 20-22 ℃, rotating the rotary drum for 15 minutes, stopping for 45 minutes, rotating the rotary drum for 5 revolutions per minute, and finishing the rotation of the rotary drum for 36 hours from the feeding start.
2) Mechanical degreasing
The sturgeon skin and flesh faces upwards after being soaked are fixed on a panel, fish fins are removed by scissors, and fish flesh and fat are removed by high-speed rotation of an electric 80-mesh steel brush or an 80-mesh nylon brush.
3) Liming and degreasing
(1) Step 2), weighing sturgeon skin obtained after mechanical degreasing;
(2) weighing 2.5% of sodium sulfide (flaky particles and effective content of 60%) by weight of the sturgeon skin in the step 3) (1), 10% of lime by weight of the sturgeon skin, 1% of liming auxiliary agent (Langsheng Cismolan BH-C) by weight of the sturgeon skin, 1% of degreasing agent (basf OC) by weight of the sturgeon skin and 300% of water by weight of the sturgeon skin;
(3) putting water and sturgeon skin into a rotary drum, adjusting the water temperature to 22-24 ℃, adding sodium sulfide and a degreasing agent, and rotating for 60 minutes and 5 revolutions per minute; adding lime and liming auxiliary agent, rotating for 10 minutes, stopping for 50 minutes, rotating the rotary drum for 2 revolutions per minute, and keeping the total time for 36 hours (counting from the feeding to the end of the rotation of the rotary drum); after the step is completed, the skin of the sturgeon expands uniformly, the skin is firm, and the ph of the skin of the sturgeon is more than 12.
(4) And (3) water washing, namely washing with water at 18-22 ℃ for 2 times and 10 minutes each time, rotating the drum for 2 revolutions per minute, and fully washing with water, wherein the water amount is more than 5 times of the mass of the sturgeon skin.
(5) And (3) mechanically removing meat and fat from the washed skin again in the same way as the step 2).
4) Deashing and degreasing
(1) Weighing the sturgeon skin treated in the step 3);
(2) weighing ammonium sulfate accounting for 2% of the weight of the sturgeon skin in the step 4) and (1), degreasing agent (basf) accounting for 2% of the weight of the sturgeon skin and water accounting for 100% of the weight of the sturgeon skin;
(3) regulating the water temperature to 31-34 ℃, adding sturgeon skin, sequentially adding ammonium sulfate and degreasing agent, keeping the water temperature at 31-34 ℃, rotating for 5 r/min and 2 h; phenolphthalein indicators show cuts 1/5-1/6 showing a red heart, indicating that deliming is in place;
(4) washing with warm water (30-37 ℃) for 10 minutes each time at 2 revolutions per minute of the rotary drum for 2 times, wherein the water amount is more than 5 times of the mass of the sturgeon skin; after cleaning, the surface of the fish skin is clean, tidy and soft, and the solid grease on the surface is basically removed.
5) Pickling and degreasing
(1) Weighing the sturgeon skin treated in the step 4);
(2) weighing 100% of water, 16% of salt, 1% of acetic acid, 2% of concentrated sulfuric acid and 2% of nonionic degreasing agent (Pasteur Eusapon OE), wherein the water is weighed according to the weight of the sturgeon skin obtained in the step 5) (1), the salt is weighed according to the weight of the sturgeon skin, the concentrated sulfuric acid is weighed according to the weight of the sturgeon skin, and the nonionic degreasing agent is weighed according to the weight of the sturgeon skin;
(3) adjusting the water temperature to 21-23 ℃, adding sturgeon skin, adding the nonionic degreasing agent and the salt, keeping the water temperature at 21-23 ℃, rotating the rotary drum for 2 revolutions per minute and rotating for 10 minutes; then adding diluted acetic acid (the acetic acid is diluted by water with the weight being 10 times of that of the acetic acid), and rotating for 1 r/min and 30 min; then adding diluted concentrated sulfuric acid (diluted by 10 times of water), adding the diluted concentrated sulfuric acid in four times on average, rotating 30 minutes each time at a rotating speed of 1 revolution/minute, stopping the drum and standing, controlling the temperature at 21-23 ℃ in the whole process, and keeping the time for 36 hours from the beginning of feeding to the end of standing; after the step is finished, the leather surface is astringent, the leather body is flexible and compact, and the pH value of the solution is 2.0-3.0;
(4) and (3) degreasing, namely taking the sturgeon skin out in an acid skin state, and removing solid fat again on a dried panel in the same way as the step 2).
6) Tanning and degreasing
Because of the particularity of the sturgeon leather, the sturgeon leather is different from common leather, and the grease is difficult to remove completely at one time, so that the step is very critical, the sturgeon leather is not easy to manufacture, and the quality of a final finished product is seriously influenced.
(1) Weighing the sturgeon skin treated in the step 5), and then putting into an pickling solution;
(2) weighing 2% of modified glutaraldehyde, 1% of aluminum tanning agent, 10% of white tannin extract, 1% of sodium formate, 2% of baking soda and 1% of mildew preventive (brother chemical industry) in the weight of the sturgeon skin in the step 6) (1);
(3) tanning
Tanning is carried out in the original pickle liquor, the water temperature is kept at 24 ℃, and diluted modified glutaraldehyde (5 times of the weight of the water for dilution) is added for 2 r/min and rotating for 1 h; adding an aluminum tanning agent, and rotating for 1 hour at the speed of 2 r/min; adding white tannin and white tannin extract, and rotating for 4 hours at a speed of 3 revolutions per minute; stopping the drum, and standing for 12 h; after standing, continuously adding sodium formate and the mildew preventive, and rotating for 1 hour at 2 revolutions per minute; then adding diluted baking soda (20 times of water by weight) which is added for 8 times on average, wherein each time is 40 minutes and 2 revolutions per minute; when the ph of the solution is detected to be 4.0, continuing to rotate for 2 hours at a speed of 2 revolutions per minute; then, the water temperature is increased to 40 ℃, the water temperature is kept, and the rotation is carried out for 2h and 2 r/min; detecting the shrinkage temperature of the sturgeon leather by boiling water to be more than 80 ℃, stopping the drum, and standing for 12 h; and cleaning the inner part of the drum for 20 minutes by running water at normal temperature, and then discharging the drum.
(4) Degreasing
Weighing the sturgeon skin treated in the step 6) and the step 3; weighing 300% of water by weight of sturgeon skin, and 3% of high-temperature resistant non-ionic degreasing agent (Pasteur Eusapon OC, brother chemical H901, mixed in a mass ratio of 1: 1) by weight of sturgeon skin; putting sturgeon skin, water and the high-temperature-resistant non-ionic degreasing agent into a rotary drum, keeping the water temperature at 60 ℃, rotating for 6 hours at 5 revolutions per minute; taking out the sturgeon skin, and washing for 20 minutes at normal temperature by running water.
The sturgeon leather after degreasing, a is even light bluish white like in figure 1, and the leather fibre is opened completely, and the finger pressure has fluffy sense, and natural grease in the sturgeon leather is got rid of totally basically, and the skin is firm, and no rotten skin, the skin is clean, is favorable to subsequent dyeing, and the grease adds, can carry out the processing preparation of different style sturgeon leather as required, like sturgeon leather case leather, sturgeon leather shoes leather, sturgeon leather area leather etc. except leather smell, there is not other pungent taste. . And the sturgeon leather tanned by the prior art is not completely degreased, fibers cannot be completely opened, subsequent uneven dyeing can be caused, the leather is inconsistent in softness and degree of formation, the position difference is obvious, and the quality of the sturgeon leather is seriously influenced, as shown in b in figure 1.
Example 2:
detecting various indexes of the sturgeon leather:
the degreased sturgeon leather prepared in example 1 was sent to SGS agency for testing, based on candidate list of high concern substances for authorization examination published by european chemical administration on 2015, 12, month 17 (according to european union No. 1907/2006 REACH regulation), 168 high concern Substances (SVHC) were screened and tested, and lead content was tested, and the test contents and results were as follows:
the concentrations of the substances of high interest tested in the test sample were all less than 0.1% depending on the specific test range and analytical technique
The lead detection results were as follows:
remarking:
(1)1mg/kg＝0.0001％
(2) MDL (medium density language) method detection limit
(3) ND is not detected (< MDL)
(4) "-" is not specified
Lead (Pb)
The test method comprises the following steps: reference US EPA method 3052: 1996 assay using ICP-OES
Then, the inventor repeatedly prepared several batches of sturgeon leather by using the method provided by the invention, and all the sturgeon leather has no lead detection, and the concentration of the high substance of interest tested in the sample is less than 0.05%.
Claims (1)
1. A sturgeon leather degreasing method comprises the following steps:
1) pre-degreasing
(1) Fully washing sturgeon skin at the water temperature of 18-22 ℃, and weighing after washing;
(2) weighing 200-300% of water, 1-1.5% of a water-soaking agent, 0.5-1% of a bactericide and 1-1.5% of a degreasing agent in the weight of the sturgeon skin obtained in the step (1);
(3) mixing the raw materials weighed in the steps 1) and 2) with the sturgeon skin, keeping the water temperature at 20-22 ℃, rotating the drum for 10-20 minutes, stopping for 40-50 minutes, rotating the drum for 3-5 revolutions per minute, and setting the time for 36 hours;
2) mechanical degreasing
Fixing the sturgeon skin and flesh side which is soaked in water on a panel, removing fins by using scissors, and removing fish and fat by using a steel wire brush or a nylon brush;
3) liming and degreasing
(1) Step 2), weighing sturgeon skin obtained after mechanical degreasing;
(2) weighing 1.5-3% of sodium sulfide by weight of the sturgeon skin in the step 3) (1), wherein the sodium sulfide is sodium sulfide particles, the effective content of the sodium sulfide particles is 50-60%, 8-10% of lime, 0.5-1% of liming auxiliary agent, 1-2% of degreasing agent and 300-400% of water;
(3) putting water and sturgeon skin into a rotary drum, adjusting the water temperature to 22-24 ℃, adding sodium sulfide and a degreasing agent, rotating for 50-70 minutes, and rotating for 3-5 revolutions per minute; adding lime and liming auxiliary agent, rotating for 5-15 minutes and stopping for 40-60 minutes, and rotating the drum for 2-4 revolutions per minute, wherein the total time of the step is 28-44 hours; after the step is completed, the sturgeon skin expands uniformly, the skin is firm, and the pH value of the sturgeon skin is greater than 12;
(4) washing with water, namely fully washing the sturgeon skin with 18-22 ℃ water;
(5) mechanically removing meat and fat from the washed skin again, wherein the method is the same as the step 2);
4) deashing and degreasing
(1) Weighing the sturgeon skin treated in the step 3);
(2) weighing ammonium sulfate which is 1.5-2% of the weight of the sturgeon skin in the step 4) (1), degreasing agent which is 1.5-2% of the weight of the sturgeon skin, and water which is 100-150% of the weight of the sturgeon skin;
(3) adjusting the water temperature, adding sturgeon skin, sequentially adding ammonium sulfate and degreasing agent, keeping the water temperature at 31-34 ℃, rotating for 1.5-2.5h at 3-5 r/min; phenolphthalein indicators show cuts 1/5-1/6 showing a red heart, indicating that deliming is in place;
(4) washing, namely fully washing sturgeon skin at the temperature of 30-37 ℃;
5) pickling and degreasing
(1) Weighing the sturgeon skin treated in the step 4);
(2) weighing 150% of water, 16-20% of salt, 1-1.5% of acetic acid, 1.5-2% of concentrated sulfuric acid and 1.5-2% of nonionic degreasing agent in the weight ratio of the sturgeon skin obtained in the step 5) (1);
(3) adjusting the water temperature, adding sturgeon skin, adding the nonionic degreasing agent, keeping the water temperature at 21-23 ℃, rotating the rotary drum for 5-15 minutes at 2-4 revolutions per minute; then adding diluted acetic acid from a feed inlet, and rotating for 1-3 r/min and 25-40 min; adding diluted concentrated sulfuric acid, uniformly adding the diluted concentrated sulfuric acid for 4-6 times, wherein each time is 25-35 minutes, the rotating speed is 1-3 revolutions per minute, stopping the drum and standing, controlling the temperature to be 21-23 ℃, and the time is 28-46 hours from the beginning of adding the nonionic degreasing agent to the end of standing; after the step is finished, the leather surface is astringent, the leather body is flexible and compact, and the pH value of the solution is 2.0-3.0;
(4) degreasing, namely taking the sturgeon skin out in an acid skin state, and removing solid fat again on a dried panel in the same way as the step 2);
6) tanning and degreasing
(1) Weighing the sturgeon skin treated in the step 5), and putting the sturgeon skin into the pickling solution again;
(2) weighing 2-3% of modified glutaraldehyde, 1-1.5% of aluminum tanning agent, 8-10% of white tannin extract, 1-1.5% of sodium formate, 2-2.5% of baking soda and 1-1.5% of mildew preventive in the weight of the sturgeon skin in the step 6) (1);
(3) tanning
The preparation method comprises the following steps of (1) carrying out the steps in an original pickling solution, keeping the water temperature at 22-26 ℃, adding diluted modified glutaraldehyde, and rotating for 1-2 hours at 2-3 rpm; adding an aluminum tanning agent, and rotating for 1-2 hours at a speed of 2-3 r/min; adding white tannin and tannin extract, and rotating for 3-5h at a speed of 3-4 rpm; stopping the drum, and standing for 8-24 h; after standing, continuously adding sodium formate and a mildew preventive, and rotating for 1-2 hours at a speed of 2-3 rpm; then adding the diluted baking soda, wherein the baking soda is added for 5-8 times on average, and each time is 30-60 minutes and 2-3 revolutions per minute; when the pH value of the solution is detected to be 4.0, continuing to rotate for 1.5-2.5 h; then, the water temperature is increased to 38-42 ℃, the water temperature is kept, and the rotation time is 1.5-2.5 h; detecting the shrinkage temperature of the sturgeon leather by using boiling water at more than 80 ℃, stopping the drum, standing for 8-24h, cleaning in a normal-temperature running water drum for 15-40 min, and taking out the sturgeon leather;
(4) degreasing
Weighing the sturgeon skin treated in the step 6) and the step 3; weighing water accounting for 300% of 200 plus of the weight of the sturgeon skin and a high-temperature resistant non-ionic degreasing agent accounting for 3-4%; putting sturgeon skin, water and the high-temperature-resistant non-ionic degreasing agent into a rotary drum, keeping the water temperature at 58-65 ℃ and rotating for 4-8 hours at 3-5 r/min; taking out the sturgeon skin, and washing for 15-40 minutes at normal temperature by running water.
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| CN102199675A (en) * | 2011-04-12 | 2011-09-28 | 王学川 | Clean process for producing leather by using sturgeon skin |
| CN102199676A (en) * | 2011-04-12 | 2011-09-28 | 王学川 | Sturgeon skin chrome tanning leather production process |
| CN102796832A (en) * | 2012-08-30 | 2012-11-28 | 陕西科技大学 | Production process for leather for painting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102199675A (en) * | 2011-04-12 | 2011-09-28 | 王学川 | Clean process for producing leather by using sturgeon skin |
| CN102199676A (en) * | 2011-04-12 | 2011-09-28 | 王学川 | Sturgeon skin chrome tanning leather production process |
| CN102796832A (en) * | 2012-08-30 | 2012-11-28 | 陕西科技大学 | Production process for leather for painting |
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