CN109536649B - Manufacturing method of environment-friendly waterproof mercerized reverse suede leather - Google Patents
Manufacturing method of environment-friendly waterproof mercerized reverse suede leather Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- 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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Abstract
The invention discloses a method for manufacturing environment-friendly waterproof mercerized suede leather, which sequentially carries out the procedures of retanning, neutralization, filling and fatliquoring and the like, wherein novel environment-friendly materials are adopted in the filling and fatliquoring to be manufactured step by step, so that the manufactured environment-friendly mercerized waterproof suede leather has good silk feeling and writing effect, the finished leather trimming rate is low, the leather utilization rate is high, and the step-by-step fatliquoring is adopted in the technical process, so that the chemical materials are fully and completely absorbed, the waste material emission is reduced, and the environment-friendly treatment difficulty is reduced.
Description
Technical Field
The invention relates to a method for manufacturing leather, in particular to a method for manufacturing environment-friendly waterproof mercerized suede leather.
Background
The traditional waterproof suede leather has the problems of fluff adhesion, excessive greasiness and the like; the traditional suede leather has the problems that pile is erected and toppled irregularly and the visual effect is not good, and can be pilling after being worn and used by people and cannot be used as a high-grade clothing article. The conventional waterproof oil fatting agent can cause the leather body to have too high softness, so that the edges and the abdomen become loose, and the position difference is easy to generate, thereby causing the problem of reducing the mechanical indexes such as tearing strength and the like of the leather; most seriously, the product has poor stability, is easy to have greasy feeling, color bloom, inconsistent color difference and the like, has poor surface touch feeling and lacks silky feeling. When in greasing, the conventional waterproof oil needs to be greased at 60 ℃ (higher temperature condition), so that the greasing procedure has higher requirement on the performance of equipment, at least the equipment is required to have better heat preservation performance, and the heating process has the problems of gas and electricity waste.
Accordingly, the present inventors have made extensive studies to solve the above problems and have made the present invention.
Disclosure of Invention
The invention aims to provide a method for manufacturing environment-friendly waterproof mercerized suede leather with good silky luster.
In order to achieve the purpose, the invention adopts the following technical scheme:
the manufacturing method of the environment-friendly waterproof mercerized anti-suede leather comprises the working procedures of material preparation, degreasing, washing, retanning, alkali extraction, water drainage, neutralization, filling and greasing, acid fixation, washing and drying, softening, leather grinding and trimming, wherein the filling and greasing is completed by step greasing, including primary greasing, secondary greasing and tertiary greasing, waterproof oil CD, waterproof oil HP and acrylic polymer are added into a drum machine according to the formula amount in the primary greasing, after the drum rotates for a certain time, the environment-friendly formaldehyde-free retanning agent UT, the environment-friendly formaldehyde-free retanning agent UR and dye are added, and after the drum rotates for a certain time, whether the leather is transparent or not is checked; when the core penetration is detected to be qualified, adding warm water at 40-50 ℃, adding formic acid, rotating for a certain time, adding the formic acid in an equal amount for three times to enable the pH value to reach the expected value, and washing twice, wherein one time is closed water washing, and the other time is running water washing; then adding warm water with the temperature of 35-45 ℃ and ammonia water, and rotating for a certain time to finish primary fatliquoring;
in the secondary greasing, after the primary greasing, continuously adding the waterproof oil CD and the waterproof oil HP according to the formula amount, rotating for a certain time, adding formic acid, and rotating for a certain time to finish the secondary greasing;
in the third greasing, after the second greasing, adding the waterproof oil D and the waterproof oil CD according to the formula amount, rotating for a certain time, continuously adding the formic acid for 2-3 times, and rotating for a certain time each time to finish the third greasing;
when the water liquid of the drum is clear, the drum is soaked and washed twice, and finally water and the aluminum tanning agent are added, the drum is rotated for a certain time, then the drum is washed twice, and then the leather embryo body is taken out of the drum, laid flat and placed.
Further, in the filling and greasing step, the waterproof oil CD and the waterproof oil HP are supplied from basf group, germany, respectively; the water repellent oil D was supplied by the german thopler chemical dye limited.
Further, in terms of parts by weight, and with reference to the treatment of 100 parts of the skin germ, the amount of the water repellent CD is 1 part and the amount of the water repellent HP is 1 part in the first greasing, the amount of the water repellent CD is 1.5 parts and the amount of the water repellent HP is 1.5 parts in the second greasing, and the amount of the water repellent D is 1 part and the amount of the water repellent CD is 0.5 part in the third greasing.
Further, in the retanning procedure, water with the temperature of 25-35 ℃, chromium powder and chromium tannin are added into a rotary drum, the rotary drum rotates for a certain time, then a chromium crosslinking agent MCS is added, the rotary drum rotates for a certain time, sodium formate and sodium bicarbonate are added, the rotary drum rotates for a certain time, the pH value reaches 3.8 +/-0.1, and the chromium crosslinking agent MCS is supplied by Taiyang combined chemical industry Co.
Furthermore, in the retanning procedure, the amount of water is 120 parts by weight, the amount of chromium powder is 1.5-2.5 parts by weight, the amount of chromium tannin is 1.0-1.5 parts by weight, the amount of chromium cross-linking agent MCS is 1.0-1.5 parts by weight, the amount of sodium formate is 1.0-1.5 parts by weight and the amount of sodium bicarbonate is 0.3-0.5 part by weight based on 100 parts by weight of the treated leather embryo.
Further, in the neutralization process, water with the temperature of 25-35 ℃ is added, sodium formate and neutralizing tannin XNL supplied by German basf limited are added, the drum rotates for a certain time, baking soda, ammonium bicarbonate and waterproof oil D are added, the drum rotates for a certain time, then bromocresol green is used as an acid-base indicator, the color development condition of the bromocresol green on the surface and the inside of the leather is checked, when the color development of the surface and the inside of the leather is consistent, the pH value is 5.5 +/-0.1, and the leather is washed twice by water in a sealed mode.
Further, in the neutralization step, based on the parts by weight and taking 100 parts of the treated skin embryo as reference, the amount of water is 150 parts, the amount of sodium formate is 2.0-2.5 parts, the amount of the neutralized tannin XNL is 1.5-2.0 parts, the amount of baking soda is 0.8-1.2 parts, the amount of ammonium bicarbonate is 0.5-0.8 part, and the amount of the waterproof oil D is 0.3-0.5 part.
Furthermore, in the degreasing process, with reference to 100 parts of the processed skin blank, 100 parts by weight of warm water at 35-45 ℃, 0.2-0.3 part by weight of oxalic acid and 1.0 part by weight of fatty aldehyde SPR-35 supplied by Darwei technologies of Sichuan are added into a rotary drum, after the rotary drum rotates for a certain time, whether the backwater state of the wet blue skin is uniform or not is checked, and the water washing is carried out after the pH value reaches 3.5 +/-0.1.
After the technical scheme is adopted, the manufacturing method of the environment-friendly waterproof mercerized suede leather has the following beneficial effects: (1) in the filling and greasing process, the dual-purpose waterproof oil CD and the dual-purpose waterproof oil HP of the fur and the leather and the polymerizable waterproof oil D are selected. The waterproof oil CD can endow the leather with moderate softness without affecting the compactness of the leather, solve the problem of loose part difference of edges and abdomen, endow the leather with silky handfeel, fine fiber and good light fastness, resist heat and have no peculiar smell; the waterproof oil HP can provide a good lubricating effect for leather fibers, and endows the leather with higher tensile strength and grain surface tear resistance; the waterproof oil D can endow leather with good softness, waterproof silk feeling and good writing effect. The three kinds of grease are added step by step to achieve the required effect. The traditional manufacturing method and the used waterproof oil have no using effect.
Further, (2) the Taiyang combined chemical chromium cross-linking agent is selected in the retanning process, so that the chromium tanning agent can be effectively promoted to permeate uniformly and play a role in fixing, the compactness, the trimming rate and the utilization rate of leather are effectively improved, the color of wet blue leather is more uniform, the chromium content in wastewater is reduced, and the difficulty in rear-stage wastewater treatment is reduced.
Furthermore, (3) the German Pasteur special neutralizer XNL is selected in the neutralization process, so that the problems of loose two-layer leather edges and abdomen, poor tensile strength and the like caused by the conventional neutralizer can be solved, and the generation of hexavalent chromium after aging can be effectively inhibited.
Furthermore, (4) in the filling process, German basf environment-friendly formaldehyde-free retanning agents UT and UR are selected to replace original melamine RDN and dicyandiamide, so that the fullness of the leather is improved, the leather is endowed with better softness, flat and fine grain surface and good leather grinding performance; meanwhile, the problem that the content of formaldehyde in finished leather exceeds the standard can be effectively reduced due to the selection of the environment-friendly formaldehyde-free retanning agent, the content of formaldehyde in finished leather can be controlled below 20ppm through detection of the finished leather produced through improvement, the finished leather completely meets the European Union standard, and the environment-friendly performance is obvious.
Detailed Description
In order to further explain the technical solution of the present invention, the following detailed description is made with reference to the embodiments.
Example 1
The invention relates to a method for manufacturing environment-friendly waterproof mercerized suede leather, which comprises the working procedures of material preparation, degreasing, washing, retanning, alkali extraction, drainage, neutralization, filling and greasing, acid fixation, washing and drying, softening, leather grinding and trimming, wherein the material preparation comprises the steps of material selection, water return, water squeezing, leather splitting, uniform shaving, trimming and weighing. In the present invention, the processes of preparing materials, washing, extracting alkali, draining, fixing with acid, washing and drying, softening, buffing and trimming are all conventional processes, and are not described in detail herein. All materials used hereinafter are in parts by weight.
In the material preparation process, the wet cowhide is selected, and 100 parts of the wet cowhide is selected and placed into a rotary drum in the embodiment, wherein the rotary drum is a conventional tool for leather processing, and the rotating speed of the rotary drum is set to six revolutions per minute.
In the degreasing process, adding 100-150 parts of warm water at 40 ℃, 0.2-0.3 part of oxalic acid and 1.0 part of fatty aldehyde SPR-35 (supplied by Sichuan Dawei science and technology Co., Ltd.), rotating the rotary drum for 60-90 minutes, checking whether the backwater state of the wet blue leather is uniform and consistent, and washing with water when the pH value reaches 3.5 +/-0.1;
in the retanning procedure, 120 parts of warm water at 30 ℃, 1.5-2.5 parts of Turkey chromium powder (SISECAM DIS TICARET A.S.) AB and 1.0-1.5 parts of Turkey chromium tannin CR-100 produced by Turkey are added into a rotary drum, the rotary drum rotates for 60 minutes, 1.0-1.5 parts of chromium crosslinking agent MCS (supplied by Taiyang combined chemical company Limited) are added, the rotary drum rotates for 60 minutes to ensure that the surface and the inner charges of wet blue leather are consistent and the color of the blue leather is uniform, 1.0-1.5 parts of sodium formate and 0.3-0.5 part of sodium bicarbonate are added, the rotary drum rotates for 30-50 minutes to ensure that the pH value reaches 3.8 +/-0.1, the chemical materials are ensured to be fully absorbed, and the leather body after retanning is tested to resist high temperature and shrink to be more than 95 ℃. And adding water with a conventional ratio into the rotary drum machine, washing with water and draining.
In the neutralization process, 100-150 parts of 30 ℃ water, 2.0-2.5 parts of sodium formate and 1.5-2.0 parts of neutralized tannin XNL (produced by Pasteur Co., Ltd. of Germany and supplied by Fujian Guangxi leather trade Co., Ltd.) are added into a rotary drum, the rotary drum rotates for 30-45 minutes, 0.8-1.2 parts of baking soda, 0.5-0.8 part of ammonium bicarbonate and 0.3-0.5 part of waterproof oil D (produced by Thompleh chemical dye Co., Ltd. of Germany and supplied by Qiangde trade Co., Ltd. of Jinjiang) are added, the rotary drum rotates for 90-120 minutes, and then bromocresol green is used as an acid-base indicator to check the color development of the bromocresol green in the surface and inside of the leather, when the color development of the leather surface and inside is consistent and the pH value is 5.5 +/-0.1, the color of the leather is uniform and full, and the leather is washed twice in water and each time is 10 minutes.
In the filling and fatliquoring process, comprising primary fatliquoring, secondary fatliquoring and tertiary fatliquoring, 1.5-2.5 parts of acrylic polymer MAP (produced by German Simma chemical industry Co., Ltd., supplied by Jinfeng leather trade Co., Ltd.), 1.0 part of water proof oil CD (produced by German BASF group, Fujian Guangxi leather trade Co., Ltd.) and 1.0 part of water proof oil HP (produced by German BASF group, Fujian Guangxi leather trade Co., Ltd.) are added to the rotary drum, the rotary drum is rotated for 40-60 minutes, 2.0-4.0 parts of environment-friendly formaldehyde-free retanning agent UT (produced by German BASF group, supplied by Fujian Guangxi leather Co., Ltd.) and 2.0-4.0 parts of environment-friendly formaldehyde-free retanning agent UR (produced by German BASF group, produced by Fujian Guangxi) and leather dye are added to the rotary drum, the drum rotates for 60-90 minutes, whether the core is penetrated or not is checked conventionally, if the core is not penetrated, the time is delayed, after the core is checked to be qualified, 150 portions of warm water at 40 ℃ of 100 plus materials is added, the total amount of 0.9-1.5 portions of formic acid is added, the formic acid is added in three equal amounts (the adding amount is 0.3-0.5 portion each time), the drum rotates for 20 minutes each time, after the pH value reaches 4.2, the drum is washed twice, is washed once for 10 minutes in water sealing mode, and is washed once for 5 minutes in running water mode; adding 100 portions of warm water at 40 ℃ and 150 portions of ammonia water at 0.3-0.5 portion, and rotating the rotary drum for 20 minutes to finish primary grease adding;
in the secondary greasing, after the primary greasing is finished, 1.5 parts of waterproof oil CD and 1.5 parts of waterproof oil HP are continuously added, the rotary drum rotates for 30-40 minutes, 0.3-0.5 part of formic acid is added, and the rotary drum rotates for 20 minutes to finish the secondary greasing;
in the third greasing, 1.0 part of waterproof oil D (supplied by German Toeplier chemical dye Co., Ltd.) and 0.5 part of waterproof oil CD are continuously added after the second greasing is finished, the rotary drum rotates for 40-60 minutes, 0.4 part of formic acid (namely 0.8 part of the total amount of formic acid) with the same amount is added twice, and the rotary drum rotates for 20 minutes each time, so that the third greasing is finished;
when the water is completely absorbed to be in a clear state, the water is soaked twice, and each time lasts ten minutes. 150 parts of water was added, 1.5 parts of aluminum tanning agent ALP (produced by Beckgieni Co., Ltd., Germany, supplied by Fufeng trade Co., Ltd., Jinjiang) was added, the drum was rotated for 60 minutes, and then water washing was carried out twice, each time for ten minutes, the leather body was spread out on the drum and laid flat, and the leather became soft and elastic. The surface has waterproof silk feeling and good writing effect.
The invention relates to a method for manufacturing environment-friendly waterproof mercerized suede leather, which has the following beneficial effects:
(1) the chrome cross-linking agent of Taiyang combined chemical industry is selected in the retanning process, so that the penetration of the chrome tanning agent can be effectively promoted to be uniform, the fixation effect can be realized, the compactness, the trimming rate and the utilization rate of leather can be effectively improved, the color of wet blue leather is more uniform, the chrome content in waste water is reduced, and the difficulty in rear-section waste water treatment is reduced.
(2) The German Pasteur special neutralizer XNL selected in the neutralization process can solve the problems of loose two-layer leather edges and abdomen, poor tensile strength and the like caused by the conventional neutralizer, and can effectively inhibit the generation of hexavalent chromium after aging.
(3) In the filling process, German basf environment-friendly formaldehyde-free retanning agents UT and UR are selected to replace original melamine RDN and dicyandiamide, so that the fullness of the leather is improved, the leather is endowed with better softness, flat and fine grain surface and good leather grinding performance; meanwhile, the problem that the content of formaldehyde in finished leather exceeds the standard can be effectively reduced due to the selection of the environment-friendly formaldehyde-free retanning agent, the content of formaldehyde in finished leather can be controlled below 20ppm through detection of the finished leather produced through improvement, the finished leather completely meets the European Union standard, and the environment-friendly performance is obvious.
(4) In the fatliquoring process, German Pasteur dual-purpose waterproof oil CD and waterproof oil HP, and German Toeplier polymerization waterproof oil D are selected. The waterproof oil CD can endow the leather with moderate softness without affecting the compactness of the leather, solve the problem of loose part difference of edges and abdomen, endow the leather with silky handfeel, fine fiber and good light fastness, resist heat and have no peculiar smell; the waterproof oil HP can provide a good lubricating effect for leather fibers, and endows the leather with higher tensile strength and grain surface tear resistance; the German Topule polymerizable waterproof oil D can endow leather with good softness, waterproof silk feeling and good writing effect. The three kinds of grease are matched and added step by step at low temperature (compared with the temperature of the traditional technology) to achieve the required effect.
The conventional waterproof oil fatliquor can cause the leather body to have too high softness, so that edges and abdomen become loose, and position difference is easy to generate, thus causing the problem that the mechanical indexes such as tearing strength and the like of the leather are reduced; most seriously, the product has poor stability, is easy to have greasy feeling, color bloom, inconsistent color difference and the like, has poor surface touch feeling and lacks silky feeling.
Example 2
This example differs from example 1 in the retanning, neutralization and filling fatliquoring process.
In the retanning procedure, 100 parts of wet blue leather and 120 parts of warm water at 30 ℃ are respectively added into a rotary drum machine in sequence, 2.0 parts of Turkish chromium powder AB and 1.0 part of Turkish chromium tannin CR-100 are added, the rotary drum machine rotates for 60 minutes, 1.0 part of chromium crosslinking agent MCS is added, the rotary drum rotates for 60 minutes, the charges on the surface and the inside of the wet blue leather are consistent, and the color of the blue leather is uniform and consistent. Then adding 1.0 part of sodium formate and 0.4 part of sodium bicarbonate, rotating the drum for 40 minutes, detecting the pH of the leather to be 3.8, and testing the high temperature resistance and shrinkage to be more than 95 ℃. And adding water with a certain proportion into the rotary drum machine, washing and draining.
In the neutralization step, 150 parts of water, 2.5 parts of sodium formate and 1.5 parts of tannin XNL are added, the drum is rotated for 30 minutes, and 1.2 parts of baking soda and 0.5 part of waterproof oil D are added and rotated for 90 minutes. And then, using bromocresol green as an acid-base indicator, and checking the color development condition of the bromocresol green on the surface and the inside of the leather until the color of the surface and the inside of the leather is consistent and the pH value is about 5.5. The leather is uniform and plump in color.
In the step of greasing, adding 2.5 parts of acrylic polymer MAP, 1.0 part of waterproof oil CD and 1.0 part of waterproof oil HP, rotating the rotary drum for 60 minutes, adding 3.0 parts of environment-friendly formaldehyde-free retanning agent UT and 3.0 parts of environment-friendly formaldehyde-free retanning agent UR, rotating for 60 minutes, checking whether the leather is permeable or not in a conventional way, and delaying the transparency, when the leather is checked to be qualified, adding 100 parts of warm water at 40 ℃ with 150 parts of flatulence, adding 0.9-1.5 parts of formic acid in total, adding the formic acid in three times with the same amount (the adding amount is 0.3-0.5 part each time), rotating the rotary drum for 20 minutes each time, and washing twice after the pH value reaches 4.2, washing once with water for 10 minutes, and washing once with running water for 5 minutes; adding 150 parts of warm water at 40 ℃, adding 0.5 part of ammonia water, and rotating for 20 minutes;
then adding 1.5 parts of waterproof oil CD and 1.5 parts of waterproof oil HP, rotating the rotary drum for 30-40 minutes, adding 0.4 part of formic acid, and rotating the rotary drum for 20 minutes;
and adding 1.0 part of the waterproof oil D and 0.5 part of the waterproof oil CD again, rotating the rotary drum for 40 minutes, adding 1.2 parts of formic acid in total, and adding the formic acid in the same amount for three times, namely adding 0.4 part of formic acid every time, rotating the rotary drum for 20 minutes every time, wherein the pH value reaches 3.8. When the water is completely absorbed to be in a clear state, the water is soaked twice, and each time lasts ten minutes. 150 parts of water was added, 1.5 parts of aluminum tanning agent ALP (produced by Beckjiri Co., Ltd., Germany, supplied by Fufeng trade Co., Ltd., Jinjiang) was added, the drum was rotated for 60 minutes, and then water washing was carried out twice, each time for ten minutes, and the skin embryo was allowed to stand by being laid flat on the drum. The leather eventually becomes soft and elastic. The surface has waterproof silk feeling and good writing effect.
The product form of the present invention is not limited to the embodiments, and any suitable changes or modifications of the similar ideas by anyone should be considered as not departing from the patent scope of the present invention.
Claims (1)
1. The production process of environment friendly waterproof mercerized suede leather includes the steps of material preparation, degreasing, water washing, retanning, alkali extraction, water drainage, neutralization, filling and greasing, acid fixation, water washing and drying, softening, leather grinding and trimming, and features that: filling and greasing are completed by step greasing, including primary greasing, secondary greasing and tertiary greasing, waterproof oil CD, waterproof oil HP and acrylic polymer are added into a drum machine according to the formula amount in the primary greasing, the drum is rotated for a certain time, an environment-friendly formaldehyde-free retanning agent UT, an environment-friendly formaldehyde-free retanning agent UR and dye are added, the rotation is performed for a certain time, and whether the core is penetrated or not is checked; when the core penetration is checked to be qualified, adding warm water at 40-50 ℃, adding formic acid, rotating for a certain time, adding the formic acid by the same amount for three times to enable the pH value to reach the expected value, and washing twice, wherein one time is closed water washing, and the other time is running water washing; then adding warm water with the temperature of 35-45 ℃ and ammonia water, and rotating for a certain time to finish primary fatliquoring;
in the secondary greasing, after the primary greasing, continuously adding the waterproof oil CD and the waterproof oil HP according to the formula amount, rotating for a certain time, adding formic acid, and rotating for a certain time to finish the secondary greasing;
in the third greasing, after the second greasing, adding the waterproof oil D and the waterproof oil CD according to the formula amount, rotating for a certain time, continuously adding the formic acid for 2-3 times, and rotating for a certain time each time to finish the third greasing;
when the water liquid of the rotary drum is in a clear state, the rotary drum is subjected to water-tight washing twice, water and an aluminum tanning agent are finally added, the rotary drum is rotated for a certain time, then the water is washed twice, and then the leather embryo body is taken out of the drum, laid flat and placed;
in the filling and greasing step, the waterproof oil CD and the waterproof oil HP are supplied from the german basf group; the waterproof oil D was supplied by the German Toeplier chemical dye Co., Ltd;
based on the parts by weight and based on 100 parts of processed leather blank, in the first greasing, the using amount of the waterproof oil CD is 1 part, and the using amount of the waterproof oil HP is 1 part, in the second greasing, the using amount of the waterproof oil CD is 1.5 parts, and the using amount of the waterproof oil HP is 1.5 parts, and in the third greasing, the using amount of the waterproof oil D is 1 part, and the using amount of the waterproof oil CD is 0.5 part;
in the retanning procedure, water with the temperature of 25-35 ℃, chromium powder and chromium tannin are added into a rotary drum, the rotary drum rotates for a certain time, then a chromium crosslinking agent MCS is added, the rotary drum rotates for a certain time, sodium formate and sodium bicarbonate are added, the rotary drum rotates for a certain time, the pH value reaches 3.8 +/-0.1, and the chromium crosslinking agent MCS is supplied by Taiyang combined chemical industry Co., Ltd;
based on the weight parts and based on 100 parts of processed leather embryo, in the retanning procedure, the using amount of water is 120 parts, the using amount of chromium powder is 1.5-2.5 parts, the using amount of chromium tannin is 1.0-1.5 parts, the using amount of chromium crosslinking agent MCS is 1.0-1.5 parts, the using amount of sodium formate is 1.0-1.5 parts, and the using amount of sodium bicarbonate is 0.3-0.5 part;
in the neutralization process, adding 25-35 ℃ of water, adding sodium formate and neutralizing tannin XNL supplied by German BASF Limited company, rotating the rotary drum for a certain time, adding baking soda, ammonium bicarbonate and waterproof oil D, rotating the rotary drum for a certain time, checking the color development condition of bromocresol green on the surface and the inside of the leather by using bromocresol green as an acid-base indicator, and when the color development of the surface and the inside of the leather is consistent, the pH value is 5.5 +/-0.1, and then washing the leather twice by water in a sealed environment;
based on the parts by weight and based on 100 parts of processed skin embryo, in the neutralization process, the using amount of water is 150 parts, the using amount of sodium formate is 2.0-2.5 parts, the using amount of neutralized tannin XNL is 1.5-2.0 parts, the using amount of baking soda is 0.8-1.2 parts, the using amount of ammonium bicarbonate is 0.5-0.8 part, and the using amount of waterproof oil D is 0.3-0.5 part;
in the degreasing process, 100 parts by weight of warm water at 35-45 ℃, 0.2-0.3 part by weight of oxalic acid and 1 part by weight of fatty aldehyde SPR-35 supplied by Sichuan Dawei science and technology Limited are added into a rotary drum based on 100 parts by weight of the processed skin blank, after the rotary drum rotates for a certain time, whether the backwater state of the wet blue skin is uniform or not is checked, and the pH value reaches 3.5 +/-0.1 and the wet blue skin is washed by water.
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| CN112779372B (en) * | 2021-01-27 | 2022-07-19 | 峰安皮业股份有限公司 | Preparation method of environment-friendly semi-vegetable tanning-metal tanning mildew-proof light-resistant suede leather |
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| CN101130825A (en) * | 2007-08-17 | 2008-02-27 | 晋江峰安皮业有限公司 | Manufacturing method for washable suede |
| CN101270396A (en) * | 2008-04-22 | 2008-09-24 | 温州大学 | Method for tanning hogskin suede-inverse clothing leather with non-chromium metalloid composite tanning agent |
| CN105648121A (en) * | 2016-01-26 | 2016-06-08 | 湖州长城皮业有限公司 | Preparation process of chromium-free tanned pigskin two-layer suede garment leather |
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