CN106755630A - A kind of leather tanning method - Google Patents
A kind of leather tanning method Download PDFInfo
- Publication number
- CN106755630A CN106755630A CN201710013235.8A CN201710013235A CN106755630A CN 106755630 A CN106755630 A CN 106755630A CN 201710013235 A CN201710013235 A CN 201710013235A CN 106755630 A CN106755630 A CN 106755630A
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- Prior art keywords
- tanning
- leather
- rotary drum
- retanning
- minutes
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Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/28—Multi-step processes
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The present invention provides a kind of leather tanning method, including a）Pre-processed before tan, animal dry hide is obtained into rawhide after immersion, fleshing, degreasing, depilation, split, pickling soften；b）Tannin extract tanning, rawhide is put into rotary drum, adds water and vegetable tanning agent to carry out vegetable tanning system, c）Al Tanning, leather is put into rotary drum plus tanning solution, is neutralized with sodium bicarbonate and sodium acetate after tanning, d）Post processing, finished leather is made by above step.The above-mentioned method with vegetable tanning agent and aluminium tanningagent composite tanning technology substitutes chromium metal tanning agents and carries out tanning, and harm of the chromic salts to environment and human body can be eliminated on the basis of tanning effect is kept.
Description
Technical field
The present invention relates to leather production technical field, especially a kind of process for tanning of leather.
Background technology
Leather is by fresh rawhide by tens road works such as immersion, degreasing, depilation, caustic dip, tanning, finishing, dyeing, stuffing arrangements
Sequence is processed into, and the operation of wherein most critical is tanning, and tanning is rawhide is converted into the ripe of moisture by adding tanning agent
Skin is semi-finished product leather, and cross-linked structure is formed between natural protein fiber, so as to improve the chemistry and mechanical stability of leather
Energy.Main process for tanning has：1）Carboxyl on inorganic salts tanning, such as chromium, aluminium slaine and azelon forms coordinate bond；
2）Amido, hydroxyl on organic matter tanning, such as aldehyde compound, phenolic compound and azelon form covalent bond；3）Plant
Tanning, is acted on by hydrogen bond and ionic bond using the high molecular weight material in water with azelon.
In above method, chrome tanning system occupies leading always with the superior tanning performance such as the good, good moldability of its heat endurance
Status, but contain hexavalent chromium in tanning agent, and toxicity is larger, and the Wastewater on Ecological Environmental of its discharge causes serious harm, and
And chromium ion easily residual is in the leather, Long Term Contact influence is healthy.
The content of the invention
The main object of the present invention is to provide a kind of leather tanning method, and its technical problem to be solved is how to protect
Hold harm of the reduction to environment and human body as far as possible on the basis of tanning effect.
According to the present invention, the technical scheme of its solve problem is
A kind of leather tanning method, comprises the following steps：
Pre-processed before step a tans：Animal dry hide obtains rawhide after immersion, fleshing, degreasing, depilation, split, pickling soften；
Step b tannin extract tannings：Rawhide obtained by step a is put into rotary drum, water and vegetable tanning agent, the addition of vegetable tanning agent is added
The 6%-10% of tare weight amount of making a living is measured, temperature in rotary drum is maintained at 35 DEG C -40 DEG C, rotate rotary drum 150-180 minutes, discharge turns
Waste liquid in drum；Leather is put into again and add water in rotary drum rinsing 30 minutes, to formic acid is added in rotary drum, make the formic acid content be
0.2%-0.4%, rotation rotary drum removal waste fluid after 30 minutes；
Step c al Tannings：Leather obtained by step b is put into rotary drum plus tanning solution, temperature is maintained at 80 DEG C -90 in drum
DEG C, rotate 40-50 minutes；Neutralized with sodium bicarbonate and sodium acetate, the leather after neutralization is rinsed with water, and drum is gone out after rinsing
Take horse and stand 18-20 hours；
Step d is post-processed：By the made leathers of step c by retanning, dyeing, stuffing, be dried to obtain finished product skin.
Above-mentioned leather tanning method, in the step a, the depilation is that the leather after fleshing, degreasing is immersed into quick lime
3-4 hours in water, taking-up is dried and is lost hair or feathers with perching knife, and is cleaned up.
Above-mentioned leather tanning method, in the step b, the vegetable tanning agent is wattle extract or quebracho tannin extract.
Above-mentioned leather tanning method, in the step c, the tanning solution is the water-soluble of 12 hydrazine aluminum sulfate potassium and formic acid
Liquid, the addition of 12 hydrazine aluminum sulfate potassium is the 5%-15% of leather weight, and tanning solution pH value 2.9-3.0 is adjusted with formic acid.
Above-mentioned leather tanning method, in the step c, the neutralization procedure is that sodium bicarbonate is slowly added in tanning solution,
Regulation pH value rotates rotary drum 30-40 minutes to 3.9-4.0；Sodium acetate regulation tanning solution pH value 4.9-5.0 is added, is rotated further
150-180 minutes.
Above-mentioned leather tanning method, in the step d, the retanning is to immerse in retanning liquid leather to carry out retanning system
30-50 minutes, multiple tanned leather content was that the formic acid solution of 1%-2% fixes 30 minutes, water rinsing.
Above-mentioned leather tanning method, the retanning liquid is the aqueous solution of content 5%-10% retanning agents, and the retanning agent is third
Olefin(e) acid-methacrylic resin.
Above-mentioned leather tanning method, in the step a, it is to be by the leather immersion content after split that the pickling softens
Soften 8-12 hours in the formic acid solution of 1%-2%, fully washing obtains rawhide after pickling.
The present invention carries out tanning using the method for vegetable tanning agent and aluminium tanningagent composite tanning technology, and technological operation is simple, is easily controlled,
The pH values of application are relatively broad, while the consumption of aluminium tanningagent can be reduced, reduce production cost.Wherein plant-aluminium composite tanning agent has
There is stronger flexibility, tanned finished leather is uniform, firm, soft, and position difference is small, and richness is high, and can obtain higher
Shrinkage temperature（80℃-86℃）.Because plant-aluminium composite tanning agent substitutes tool chrome tanning agent, do not produced in production process and contain Cr VI
Waste liquid, the harmfulness for environment is small, and the leather for producing does not contain harmful chrome tanning agent, suitable for making footwear
In, the leather and fur products that is contacted with skin such as handbag, clothes.
Specific embodiment
Technical scheme is clearly and completely described with reference to embodiment.Explain in the following description
Many details have been stated in order to fully understand the present invention, but the present invention can also be using other different from described here
Other manner is implemented, and those skilled in the art can do similar popularization, therefore this in the case of without prejudice to intension of the present invention
Invention is not limited by following public specific embodiment.
Animal dry hide is made finished product by the present invention by pretreatment, tannin extract tanning, al Tanning and post-treating and other steps before tan
Skin, comprises the following steps that.
Pre-processed before step a tans：By animal dry hide by immersion, fleshing, degreasing, quick lime liming depilation, split, pickling
Rawhide is obtained after softening.
Specifically the operating procedure of pretreatment is：Animal dry hide is immersed in water and is softened, gone to allowance for bark upper attachment with perching knife
Meat and grease.Leather is immersed 3-4 hours in lime water, taking-up is dried and lost hair or feathers with perching knife, is cleaned up.By the skin after cleaning
Sub-pieces skin, shaving, are used to reduce pelt thickness and make whole skin thickness uniform, are beneficial to tanning agent to the infiltration in pelt, while
Smooth grain side of leather, surface yield is improved.It is after split that leather immersion content is small to soften 8-12 in the formic acid solution of 1%-2%
When, pickling degree can be better controled over to leather pickling using formic acid, and finished leather is relatively soft.Fully washing is given birth to after pickling
Skin, washing can be removed and desalted and protein degradation product.
Step b tannin extract tannings：Rawhide obtained by step a is put into water is added in rotary drum, and add vegetable tanning agent, vegetable tanning
The addition of agent is made a living the 6%-10% of tare weight amount, the temperature in rotary drum is maintained at 35 DEG C -40 DEG C, rotates rotary drum 150-180 points
Clock, the vegetable tanning agent is wattle extract or quebracho tannin extract.Leather is placed in water squeezing in wringing machine after vegetable tanning, discharges rotary drum
Middle waste liquid.Leather puts into and add water in rotary drum rinsing 30 minutes again, keeps water temperature in drum, to formic acid is added in rotary drum, makes formic acid
Content is 0.2%-0.4%, rotation rotary drum removal waste fluid after 30 minutes.
Step c al Tannings：The made leathers of step b are put into rotary drum and are added water, 12 hydrazine aluminum sulfate potassium are added in water（It is bright
Alum）Tanning solution is configured to, the addition of alum is the 5%-15% of leather weight, and tanning solution pH value 2.9-3.0, tan are adjusted with formic acid
Liquid temperature degree processed is maintained at 80 DEG C -90 DEG C, rotates 40-50 minutes.Sodium bicarbonate is slowly added in tanning solution, pH value 3.9-4.0 is adjusted,
It is rotated further 30-40 minutes；Sodium acetate is added to adjust the pH value 4.9-5.0 of tanning solution, water temperature keeps constant, is rotated further 150-
180 minutes.Add sodium acetate to be buffered neutralization step by step after sodium bicarbonate is first added in tanning solution, tanning effect can be strengthened, increase
Plus leather richness and whiteness.Leather after neutralization is rinsed with water.Leather is gone out into drum, horse is taken and is stood 18-20 hours.By tan
Leather after system is placed in wringing machine water squeezing, leather water content is down to 35%-45%.
Step d is post-processed：By the made leathers of step c by retanning, dyeing, stuffing, be dried to obtain finished product skin.
Leather is immersed in retanning liquid and carry out retanning system, the retanning liquid is the aqueous solution of retanning agent, wherein retanning agent
Content is 5%-10%, and the retanning agent is used by two kinds of resin collocation of acrylic acid-methacrylic acid, and wherein methacrylic acid contains
Amount accounts for 60%.Retanning 30-50 minutes.Multiple tanned leather content is that the formic acid solution of 1%-2% fixes 30 minutes, water drift
Wash.The grain side of leather consolidation processed through acrylic resin retanning is careful, and reduction position is poor, while the surface of leather can be changed
Electric charge, promotes even dyeing.
Leather after retanning is dyeed as needed, color is immersed in edible vegetable oil or grease after fixing, and grease is constantly penetrated into
To in leather, eat leather extending after oil, dry in the shade naturally and obtain finished product skin.
Percentage in above step is weight percentage.
Embodiment 1
Pre-processed before step a tans：Animal dry hide is immersed in water and is extremely softened, gone to allowance for bark the meat and grease of upper attachment with flat chisel.
Then leather is immersed 3 hours in lime water, taking-up is dried and lost hair or feathers with perching knife, is cleaned up.By the leather split after cleaning,
Shaving.Leather is immersed after split is softened 8 hours in the formic acid that content is 1%, fully washing obtains rawhide after pickling.
Step b tannin extract tannings：Rawhide after pretreatment is put into rotary drum and adds water, to adding wattle extract in rotary drum,
The addition of wattle extract makes a living the 7% of tare weight amount, rotates 150 minutes, and leather is placed in wringing machine water squeezing, in discharge rotary drum
Waste liquid.Leather after water squeezing puts into and add water in rotary drum rinsing 30 minutes again, and it is 35 DEG C to keep water temperature in drum.Rinse backward rotary drum
It is interior to add the formic acid that content is 0.3%, rotation rotary drum removal waste fluid after 30 minutes.
Step c al Tannings：Leather after vegetable tanning is put into rotary drum and is added water, the alum of leather weight 9% is added in water, add first
It is 3.0 that acid controls tanning solution pH value, and tanning solution temperature is maintained at 85 DEG C, rotates 40 minutes.Sodium bicarbonate is slowly added in tanning solution,
Regulation pH value 4.0, is rotated further 30 minutes；Sodium acetate is added, pH value 5.0 is adjusted, water temperature keeps constant, is rotated further 160 points
Clock.Leather after neutralization is rinsed with water.Leather goes out drum and takes horse standing 18 hours.Tanned leather is placed in wringing machine, makes
Leather water content is down to 40%.
Step d is post-processed：To be carried out in leather retanning liquid of the immersion containing acrylic acid-methacrylic acid resin after water squeezing
Retanning system, the content of the retanning agent is 6%, retanning system 40 minutes.The formic acid solution that tanned leather content is 1% is answered to consolidate
It is fixed 30 minutes, water rinsing.Leather after retanning is dyeed as needed, is immersed in grease after dyeing, grease is constantly penetrated into
In leather, eat leather extending after oil, dry in the shade naturally and obtain finished leather.
Embodiment 2
Pre-processed before step a tans：Animal dry hide is immersed in water and is extremely softened, go to allowance for bark the meat of attachment and grease.Then will
4 hours in leather immersion lime water, taking-up is dried and is lost hair or feathers with perching knife, is cleaned up；By leather split, shaving after cleaning.
Leather is immersed after split is softened 10 hours in the formic acid that content is 2%, fully washing obtains rawhide after pickling.
Step b tannin extract tannings：Rawhide obtained by step a is put into rotary drum and adds water, to adding quebracho in rotary drum
Tannin extract, the addition of tannin extract makes a living the 10% of tare weight amount, rotates rotary drum 180 minutes, and leather is placed in wringing machine water squeezing, in row's rotary drum
Waste liquid.Add water rinsing 30 minutes in leather input rotary drum after water squeezing, and it is 40 DEG C to keep water temperature in drum, is rinsed in backward rotary drum
Addition content is 0.4% formic acid, rotation rotary drum removal waste fluid after 30 minutes.
Step c al Tannings：Leather after vegetable tanning is put into rotary drum and is added water, add alum to be configured to tanning solution in water, alum
Addition is the 13% of leather weight, and it is 2.9 to adjust tanning solution pH value with formic acid, and tanning solution temperature is maintained at 90 DEG C, rotates 50 points
Clock.Sodium bicarbonate is slowly added in tanning solution, pH value 4.0 is adjusted, is rotated further 40 minutes；Sodium acetate is added in tanning solution, is adjusted
Section pH value 5.0, water temperature keeps constant and persistently rotates 180 minutes.Leather after neutralization is rinsed with water.Leather goes out drum and takes Ma Jing
Put 20 hours.Tanned leather is placed in wringing machine water squeezing, leather water content is down to 45%.
Step d is post-processed：Retanning system is carried out in leather immersion retanning liquid after water squeezing, the retanning liquid is retanning agent（Third
Olefin(e) acid-methacrylic resin）Content is 8% aqueous solution.Retanning 30-50 minutes.Multiple tanned leather content is 2%
Formic acid solution fix 30 minutes, water rinsing.By the leather coloring after retanning, color is immersed in edible vegetable oil after fixing, and is made oily continuous
In penetrating into leather, eat leather extending after oil, dry in the shade naturally and obtain finished leather.
Content described above is only present pre-ferred embodiments, it is clear that described embodiment is only of the invention one
Section Example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out the every other embodiment obtained under the premise of creative work, belong to the scope of protection of the invention.
Claims (8)
1. a kind of leather tanning method, it is characterised in that：Comprise the following steps：
Step a, pre-processes before tan：Animal dry hide obtains rawhide after immersion, fleshing, degreasing, depilation, split, pickling soften；
Step b, tannin extract tanning：Rawhide obtained by step a is put into rotary drum, add water and vegetable tanning agent, vegetable tanning agent plus
Enter amount to make a living the 6%-10% of tare weight amount, temperature in rotary drum is maintained at 35 DEG C -40 DEG C, rotate rotary drum 150-180 minute, discharge
Waste liquid in rotary drum；Leather is put into again and add water in rotary drum rinsing 30 minutes, to formic acid is added in rotary drum, make the formic acid content be
0.2%-0.4%, rotation rotary drum removal waste fluid after 30 minutes；
Step c, al Tanning：Leather obtained by step b is put into rotary drum plus tanning solution, temperature is maintained at 80 DEG C -90 in drum
DEG C, rotate 40-50 minutes；Neutralized with sodium bicarbonate and sodium acetate, the leather after neutralization is rinsed with water, and drum is gone out after rinsing
Take horse and stand 18-20 hours；
Step d, post processing：By the made leathers of step c by retanning, dyeing, stuffing, be dried to obtain finished product skin.
2. leather tanning method according to claim 1, it is characterised in that：In the step a, the depilation is to go
3-4 hours in leather immersion lime water after meat, degreasing, taking-up is dried and is lost hair or feathers with perching knife, and is cleaned up.
3. leather tanning method according to claim 1, it is characterised in that：In the step b, the vegetable tanning agent is chaste tree
Bark tannin extract or quebracho tannin extract.
4. leather tanning method according to claim 1, it is characterised in that：In the step c, the tanning solution is 12
Hydrazine aluminum sulfate potassium and first aqueous acid, the addition of 12 hydrazine aluminum sulfate potassium is the 5%-15% of leather weight, uses formic acid
Regulation tanning solution pH value 2.9-3.0.
5. leather tanning method according to claim 4, it is characterised in that：In the step c, the neutralization procedure be
Sodium bicarbonate is slowly added in tanning solution, regulation pH value to 3.9-4.0 rotates rotary drum 30-40 minutes；Add sodium acetate regulation tanning
Liquid pH value 4.9-5.0, is rotated further 150-180 minutes.
6. leather tanning method according to claim 1, it is characterised in that：In the step d, the retanning is by leather
Carried out retanning 30-50 minutes in immersion retanning liquid, multiple tanned leather content is that the formic acid solution of 1%-2% fixes 30 points
Clock, water rinsing.
7. leather tanning method according to claim 6, it is characterised in that：The retanning liquid is content 5%-10% retanning agents
The aqueous solution, the retanning agent be acrylic acid-methacrylic acid resin.
8. leather tanning method according to claim 1, it is characterised in that：In the step a, the pickling soften be by
To soften 8-12 hours in the formic acid solution of 1%-2%, fully washing obtains rawhide to leather immersion content after split after pickling.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710013235.8A CN106755630A (en) | 2017-01-09 | 2017-01-09 | A kind of leather tanning method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710013235.8A CN106755630A (en) | 2017-01-09 | 2017-01-09 | A kind of leather tanning method |
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| CN106755630A true CN106755630A (en) | 2017-05-31 |
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| CN201710013235.8A Pending CN106755630A (en) | 2017-01-09 | 2017-01-09 | A kind of leather tanning method |
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Cited By (5)
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| CN109762950A (en) * | 2019-03-08 | 2019-05-17 | 陕西科技大学 | A kind of tanning process of the main tan of leather |
| CN111171583A (en) * | 2020-01-15 | 2020-05-19 | 陕西科技大学 | Method for preparing high-moisture-absorption and moisture-penetrability regenerated leather from leather-making solid waste |
| CN111304376A (en) * | 2020-03-06 | 2020-06-19 | 中牛集团有限公司 | Environment-friendly tanning method and device for leather |
| CN112725550A (en) * | 2020-12-31 | 2021-04-30 | 晋江市永建皮革制品有限公司 | Environment-friendly preparation process of washable oxen two-layer leather |
| CN115232892A (en) * | 2022-07-11 | 2022-10-25 | 安徽沸石新材料科技有限公司 | Leather tanning treatment method based on zeolite |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109762950A (en) * | 2019-03-08 | 2019-05-17 | 陕西科技大学 | A kind of tanning process of the main tan of leather |
| CN109762950B (en) * | 2019-03-08 | 2021-11-02 | 陕西科技大学 | Tanning process for leather main tanning |
| CN111171583A (en) * | 2020-01-15 | 2020-05-19 | 陕西科技大学 | Method for preparing high-moisture-absorption and moisture-penetrability regenerated leather from leather-making solid waste |
| CN111304376A (en) * | 2020-03-06 | 2020-06-19 | 中牛集团有限公司 | Environment-friendly tanning method and device for leather |
| CN112725550A (en) * | 2020-12-31 | 2021-04-30 | 晋江市永建皮革制品有限公司 | Environment-friendly preparation process of washable oxen two-layer leather |
| CN115232892A (en) * | 2022-07-11 | 2022-10-25 | 安徽沸石新材料科技有限公司 | Leather tanning treatment method based on zeolite |
| CN115232892B (en) * | 2022-07-11 | 2024-03-12 | 安徽沸石新材料科技有限公司 | Leather tanning treatment method based on zeolite |
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