CN104726622A - Salt-free pickling two-step chrome tanning process - Google Patents
Salt-free pickling two-step chrome tanning process Download PDFInfo
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- CN104726622A CN104726622A CN201510134190.0A CN201510134190A CN104726622A CN 104726622 A CN104726622 A CN 104726622A CN 201510134190 A CN201510134190 A CN 201510134190A CN 104726622 A CN104726622 A CN 104726622A
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- liming
- tare weight
- weight amount
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/28—Multi-step processes
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/04—Mineral tanning
- C14C3/06—Mineral tanning using chromium compounds
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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 invention provides a salt-free pickling two-step chrome tanning process. The process comprises the following steps: firstly pre-tanning softened leather by using an SF-1 tanning agent; and performing salt-free pickling and conventional chrome tanning. According to the process flow, usage of edible salt is completely avoided, the prepared wet-blue leather has pure color, fine grain side and soft leather body, usage of neutral salt is avoided in pickling, and thus the content of neutral salt in tanning waste water is greatly reduced.
Description
Technical field
The present invention relates to and clean ecological tanning technology field, be specifically related to a kind of salt-free pickling two step chrome tanning process.
Background technology
Pickling is operation very crucial before conventional chrome tanning, and good pickling can make chrome tanning agent successfully penetrate between collagen fiber matrix.The neutral salt of about 8% need be added to the swelling suppressing collagen in acidic medium during pickling, the leather-making waste water of consequent high density saliferous is a serious environmental problem, for reaching the Sustainable development object of leather industry, cleaning of process hides is also imperative, and salt-free pickling is a wherein important link.
In recent years, with regard to domestic research, Feng practices to enjoy etc. and utilizes a kind of novel salt-free auxiliary pickling agent of organic sulfonic acid compound, EDETATE SODIUM, organic acid compou nd synthesis, (Feng practices and enjoys to use this auxiliary agent can obtain the careful wet blue leather of good hand feeling, grain, Bai Qingquan. a kind of novel salt-free pickling leather additive [P]. Shandong: CN102242228A, 2011-11-16.); Single will China of Sichuan University etc. utilize naphthalene, phenol, urea etc. at different conditions polycondensation obtain auxiliary pickling agent, use this auxiliary agent can improve chrome uptake rate, remove the use (Dan Zhihua of neutral salt from, Wang Qunzhi. the research [J] of salt-free pickling and auxiliary agent. Chinese leather, 1998,27 (10): 5-7).Being developed as of Novel immersion acid assistant realizes providing approach effectively without (lacking) salt, but also there is certain shortcoming, the use of auxiliary pickling agent may introduce new hazardous and noxious substances, may produce secondary pollution, brings new difficulty etc. to the process of follow-up waste water.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide a kind of salt-free pickling two step chrome tanning process, completely avoid the use of salt in this technological process, and by wet blue leather pure color, body bone softness that this technique obtains, shrinkage temperature can reach more than 98 DEG C.
In order to achieve the above object, the technical scheme that the present invention takes is:
A kind of salt-free pickling two step chrome tanning process, comprises the following steps:
1) rear input rotary drum is washed to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is ox-hide, sheepskin or pigskin, then adds the SF-1 chromium powder of liming tare weight amount 2% ~ 3%, temperature 20 DEG C ~ 25 DEG C, rotate 2 ~ 4h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 2.5 of body lotion ~ 3.0 in 30min, at 20 DEG C ~ 25 DEG C, rotate 1 ~ 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3% ~ 4%, temperature 20 DEG C ~ 25 DEG C, rotate 2h; Then the sodium bicarbonate of liming tare weight amount 1.8% ~ 2.2% is used to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulates pH to 3.8 ~ 4.0, rotates 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, go out drum, take horse and leave standstill.
Described SF-1 chromium powder is a kind of tanning agent of cloudy chromium complex class.
Beneficial effect of the present invention is:
If only use SF-1 tanning agent to carry out complete chrome tanning to softening pelt, the wet blue obtained is faint in color, and grain is coarse, and comparatively plate is hard for leather body.The present invention first carries out pretan with SF-1 tanning agent to softening skin, then carries out salt-free pickling and conventional chrome tanning, the wet blue leather pure color obtained, grain is careful, leather body is soft, and avoids the use of neutral salt during pickling, greatly reduces the content of neutral salt in tanning waste water.
Embodiment
Describe the present invention below in conjunction with embodiment.
Embodiment one
A kind of salt-free pickling two step chrome tanning process, comprises the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is ox-hide, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 2%, temperature 22 DEG C, rotates 2h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 2.2 of body lotion in 30min, at 22 DEG C, rotate 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 4%, temperature 22 DEG C, rotate 2h; Then use liming tare weight amount 2.2% sodium bicarbonate to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 4.0, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
The present embodiment gained wet blue leather Ts is 103 DEG C.
Embodiment two
A kind of salt-free pickling two step chrome tanning process, comprises the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is pigskin, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 2.5%, temperature 20 DEG C, rotates 3h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 3.0 of body lotion in 30min, at 20 DEG C, rotate 1h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3.5%, temperature 20 DEG C, rotate 2h; Then use the sodium bicarbonate of liming tare weight amount 1.8% to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 3.8, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
The present embodiment gained wet blue leather Ts is 102 DEG C.
Embodiment three
A kind of salt-free pickling two step chrome tanning process, comprises the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is sheepskin, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 3%, temperature 25 DEG C, rotates 4h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 3.0 of body lotion in 30min, at 25 DEG C, rotate 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3%, temperature 25 DEG C, rotate 2h; Then use the sodium bicarbonate of liming tare weight amount 2.2% to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 4.0, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
The present embodiment gained wet blue leather Ts is 99 DEG C.
Embodiment four
A kind of salt-free pickling two step chrome tanning process, comprises the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is sheepskin, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 2.8%, temperature 25 DEG C, rotates 3.5h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 2.8 of body lotion in 30min, at 25 DEG C, rotate 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3.2%, temperature 25 DEG C, rotate 2h; Then use the sodium bicarbonate of liming tare weight amount 2.0% to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 4.0, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
The present embodiment gained wet blue leather Ts is 100 DEG C.
Claims (6)
1. a salt-free pickling two step chrome tanning process, is characterized in that, comprise the following steps:
1) rear input rotary drum is washed to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is ox-hide, sheepskin or pigskin, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 2% ~ 3%, temperature 20 DEG C ~ 25 DEG C, rotate 2 ~ 4h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 2.5 of body lotion ~ 3.0 in 30min, at 20 DEG C ~ 25 DEG C, rotate 1 ~ 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3% ~ 4%, temperature 20 DEG C ~ 25 DEG C, rotate 2h; Then the sodium bicarbonate of liming tare weight amount 1.8% ~ 2.2% is used to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulates pH to 3.8 ~ 4.0, rotates 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, go out drum, take horse and leave standstill.
2. one according to claim 1 salt-free pickling two step chrome tanning process, is characterized in that: described SF-1 chromium powder is a kind of tanning agent of cloudy chromium complex class.
3. one according to claim 1 salt-free pickling two step chrome tanning process, is characterized in that: comprise the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is ox-hide, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 2%, temperature 22 DEG C, rotates 2h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 2.2 of body lotion in 30min, at 22 DEG C, rotate 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 4%, temperature 22 DEG C, rotate 2h; Then use liming tare weight amount 2.2% sodium bicarbonate to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 4.0, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
4. one according to claim 1 salt-free pickling two step chrome tanning process, is characterized in that: comprise the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight amount 100%, liming skin is pigskin, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 2.5%, temperature 20 DEG C, rotates 3h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 3.0 of body lotion in 30min, at 20 DEG C, rotate 1h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3.5%, temperature 20 DEG C, rotate 2h; Then use the sodium bicarbonate of liming tare weight amount 1.8% to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 3.8, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
5. one according to claim 1 salt-free pickling two step chrome tanning process, is characterized in that: comprise the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, liquid adds the water of liming tare weight amount 100%, and liming skin is sheepskin, then adds the SF-1 chromium powder tanning agent of liming tare weight amount 3%, temperature 25 DEG C, rotates 4h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 3.0 of body lotion in 30min, at 25 DEG C, rotate 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3%, temperature 25 DEG C, rotate 2h; Then use the sodium bicarbonate of liming tare weight amount 2.2% to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 4.0, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
6. one according to claim 1 salt-free pickling two step chrome tanning process, is characterized in that: comprise the following steps:
1) wash rear input rotary drum to the liming severe edema due to hypofunction of the spleen after deashing and softening and carry out the first step tanning, add the water of liming tare weight 100%, liming skin is sheepskin, adds the SF-1 chromium powder tanning agent of liming tare weight amount 2.8%, temperature 25 DEG C, rotates 3.5h;
2) formic acid after dilution or sulphuric acid soln gradation added in the first step tanning body lotion and by the pH regulator to 2.8 of body lotion in 30min, at 25 DEG C, rotate 2h; Carry out second step tanning again, add basicity 33% chromium powder of liming tare weight amount 3.2%, temperature 25 DEG C, rotate 2h; Then use the sodium bicarbonate of liming tare weight amount 2.0% to be mixed with the aqueous solution that concentration is 10%, divide and add for 6 times, every minor tick 20min, regulate pH to 4.0, rotate 1h, supplement liming tare weight amount 150%, 40 DEG C of hot water, turn 2h, stop drum and spend the night, next day turns 0.5h, goes out drum, takes horse and leaves standstill.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510134190.0A CN104726622B (en) | 2015-03-25 | 2015-03-25 | Salt-free pickling two-step chrome tanning process |
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| CN201510134190.0A CN104726622B (en) | 2015-03-25 | 2015-03-25 | Salt-free pickling two-step chrome tanning process |
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| CN104726622A true CN104726622A (en) | 2015-06-24 |
| CN104726622B CN104726622B (en) | 2017-02-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522455A (en) * | 2020-11-26 | 2021-03-19 | 无极县景森皮革制品有限公司 | Non-pickling tanning method for leather |
| CN114231672A (en) * | 2021-11-29 | 2022-03-25 | 无极县景森皮革制品有限公司 | Leather pickling-free, salt-free and high-absorption chrome tanning process method |
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| WO2009121769A1 (en) * | 2008-04-01 | 2009-10-08 | Rhodia Operations | Process for pre-tanning and tanning skins with organic tanning agent |
| CN101974655A (en) * | 2010-10-15 | 2011-02-16 | 陕西科技大学 | Method for tanning non-pickling high-pH chrome leather by using chrome formate |
| CN103773908A (en) * | 2014-01-21 | 2014-05-07 | 中国皮革和制鞋工业研究院 | Method for tanning leather without pickling |
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2015
- 2015-03-25 CN CN201510134190.0A patent/CN104726622B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009121769A1 (en) * | 2008-04-01 | 2009-10-08 | Rhodia Operations | Process for pre-tanning and tanning skins with organic tanning agent |
| CN101974655A (en) * | 2010-10-15 | 2011-02-16 | 陕西科技大学 | Method for tanning non-pickling high-pH chrome leather by using chrome formate |
| CN103773908A (en) * | 2014-01-21 | 2014-05-07 | 中国皮革和制鞋工业研究院 | Method for tanning leather without pickling |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112522455A (en) * | 2020-11-26 | 2021-03-19 | 无极县景森皮革制品有限公司 | Non-pickling tanning method for leather |
| CN112522455B (en) * | 2020-11-26 | 2022-02-11 | 无极县景森皮革制品有限公司 | Non-pickling tanning method for leather |
| CN114231672A (en) * | 2021-11-29 | 2022-03-25 | 无极县景森皮革制品有限公司 | Leather pickling-free, salt-free and high-absorption chrome tanning process method |
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| CN104726622B (en) | 2017-02-22 |
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