CN109762950B - Tanning process for leather main tanning - Google Patents
Tanning process for leather main tanning Download PDFInfo
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- CN109762950B CN109762950B CN201910174681.6A CN201910174681A CN109762950B CN 109762950 B CN109762950 B CN 109762950B CN 201910174681 A CN201910174681 A CN 201910174681A CN 109762950 B CN109762950 B CN 109762950B
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Abstract
The invention discloses a leather tanning process for leather main tanning, and belongs to the field of leather making. The method takes a corium Elaeagni extract as a plant tanning agent to tanne the garment leather acid skin and establishes a corium Elaeagni extract main tanning process, and specifically comprises the steps of pickling and softening, alkali extraction, tanning, neutralization, and building up after going out of a drum. The obtained leather has high softness, obvious thickening and light color, and the shrinkage temperature of the leather can reach over 75 ℃. The tanning agent is green and environment-friendly, equipment used for tanning is low in cost, the process is simple, the efficiency is high, the performance of leather is good, and the method is beneficial to clean production in the leather industry.
Description
Technical Field
The invention relates to a leather tanning process for leather main tanning.
Background
The tanning agent is the key for converting the raw hide into the leather, and the currently applied tanning agents comprise a chromium tanning agent, an aluminum tanning agent, a zirconium tanning agent, an iron tanning agent, a plant tanning agent, an aldehyde tanning agent, a synthetic tanning agent and the like, wherein the leather tanned by the chromium tanning agent is widely applied with the advantages of good temperature and water resistance, high shrinkage temperature and the like. Because of the limited chromium resources in China, a great deal of pollution is generated in the chromium tanning process, and great influence is generated on the environment and the human health, people are always searching for a cleaner and more environment-friendly tanning agent. The plant tanning agent as a pure natural extracted tanning agent has the characteristics of small environmental pollution, no toxicity, reproducibility, easy degradation and the like, and is receiving more and more attention. The corium indicum is a shrub plant widely distributed in China and contains rich tannin components, the corium indicum tannin extract is used as a tanning agent, a main tanning process for pickled leather is established, the process is green and environment-friendly, the operation steps are simple, the tanning time is short, and the tanned leather has good performance.
An effective solution to the problems in the related art has not been proposed yet.
Disclosure of Invention
The invention aims to provide a leather tanning process for leather main tanning, which is realized by the following operation steps:
(1) pickling for softening, weighing and marking the clothing leather acid leather, putting the clothing leather acid leather into a rotary drum, controlling the temperature at 30-40 ℃, controlling the liquid ratio at 100-300%, adding 0.5-3% of inorganic acid and 5-20% of industrial salt, adjusting the pH value to 2-5, and softening for 0.5-2 h;
(2) extracting alkali, adding 1-2% inorganic alkali, adjusting pH to 4-6, and maintaining for 1-3 hr;
(3) tanning, controlling the temperature to be 35-45 ℃, controlling the liquid ratio to be 100-200%, wherein the tanning is divided into three stages, adding 5-10% of coriaria tannin extract at the early stage, the tanning time is 0.5-1h, adding 10-20% of coriaria tannin extract at the middle stage, the tanning time is 1-2h, adding 10-20% of coriaria tannin extract at the later stage, and the tanning time is 1-3 h;
(4) neutralizing, adding 0.5-2% organic base, adjusting pH to 4.5-6.5, and neutralizing for 1-2 h;
(5) and (5) taking out the leather from the drum and building a bridge, taking out the neutralized leather, and standing at room temperature for 10-20h to finish the tanning of the leather.
Preferably, the clothing leather acid skin in the step (1) comprises acid skin raw materials prepared from sheep skin, cow skin and pig skin, the inorganic acid comprises a mixture of one or more of hydrochloric acid, sulfuric acid, nitric acid and phosphoric acid, and the industrial salt comprises a mixture of one or more of sodium chloride, potassium chloride, calcium chloride, sodium sulfate, potassium sulfate, sodium sulfite, sodium hyposulfite and sodium thiosulfate.
Preferably, the inorganic base in step (2) is one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate and sodium bicarbonate.
Preferably, the coriaria sinica extract in step (3) is an extract rich in tannin components prepared from coriaria sinica or corium mori.
Preferably, the organic base in step (4) is one or more of sodium formate, calcium formate, potassium formate, sodium acetate, calcium acetate, potassium acetate and sodium oxalate.
Compared with the related art, the invention has the following technical effects:
the method establishes the main tanning process of the pickled leather by taking the corium indicum tannin extract as the tanning agent, and the process is green and environment-friendly, has simple operation steps, short tanning time, high softness, obvious thickening and light color of the tanned leather, and has the shrinkage temperature of over 75 ℃.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The embodiment of the application provides a leather main tanning process, which is realized by the following operation steps:
(1) pickling for softening, weighing and marking sheep clothing leather acid leather, putting into a rotary drum, controlling the temperature at 30 ℃, controlling the liquid ratio at 100%, adding 0.5% hydrochloric acid and 5% sodium chloride, adjusting the pH value to 2, and softening for 0.5 h;
(2) extracting alkali, adding 1% sodium hydroxide, adjusting pH to 4, and standing for 1 h;
(3) tanning, controlling the temperature to be 35 ℃, controlling the liquor ratio to be 100%, adding 5% of coriaria tannin extract at the early stage of tanning, wherein the tanning time is 0.5h, adding 10% of coriaria tannin extract at the middle stage, the tanning time is 1h, adding 10% of coriaria tannin extract at the later stage, and the tanning time is 2 h;
(4) neutralizing, adding 0.5% sodium formate, adjusting pH to 4.5, and neutralizing for 1 h;
(5) and (5) taking out the leather from the drum and building a horse, taking out the neutralized leather, and standing at room temperature for 10h to finish the tanning of the leather.
Example two:
different from the embodiment, the tanning process for leather main tanning is realized by the following operation steps:
(1) pickling for softening, weighing and marking ox clothing leather acid leather, placing into a rotary drum, controlling the temperature at 35 ℃, controlling the liquid ratio at 150%, adding 1% sulfuric acid and 10% sodium sulfate, adjusting the pH value to 3, and softening for 1 h;
(2) extracting alkali, adding 1.5% sodium bicarbonate, adjusting pH to 5, and standing for 2 h;
(3) tanning, controlling the temperature to be 40 ℃, controlling the liquor ratio to be 150%, adding 10% of coriaria tannin extract in the early stage of tanning, wherein the tanning time is 1h, adding 10% of coriaria tannin extract in the middle stage, the tanning time is 1h, adding 10% of coriaria tannin extract in the later stage, and the tanning time is 1 h;
(4) neutralizing, namely adding 1% of sodium acetate, adjusting the pH value to 5, and neutralizing for 1.5 h;
(5) and (5) taking out the leather from the drum and building a horse, taking out the neutralized leather, and standing at room temperature for 15h to finish the tanning of the leather.
Example three:
different from the embodiment, the tanning process for leather main tanning is realized by the following operation steps:
(1) pickling for softening, weighing and marking the pickled pig clothing leather, putting the weighed and marked pickled pig clothing leather into a rotary drum, controlling the temperature at 40 ℃, controlling the liquid ratio at 200%, adding 2% hydrochloric acid and 15% sodium sulfate, adjusting the pH value to 4, and softening for 2 hours;
(2) extracting alkali, adding 2% sodium carbonate, adjusting pH to 6, and standing for 3 h;
(3) tanning, controlling the temperature at 45 ℃ and the liquor ratio at 200%, adding 5% of coriaria tannin extract at the early stage of tanning, wherein the tanning time is 1h, adding 10% of coriaria tannin extract at the middle stage, the tanning time is 1h, adding 20% of coriaria tannin extract at the later stage, and the tanning time is 3 h;
(4) neutralizing, namely adding 2% of sodium formate, adjusting the pH value to 5.5, and neutralizing for 2 hours;
(5) and (5) taking out the leather from the drum and building a horse, taking out the neutralized leather, and standing at room temperature for 20h to finish the tanning of the leather.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. A tanning process for leather main tanning is characterized by comprising the following operation steps:
(1) pickling for softening, weighing and marking the clothing leather acid leather, putting the clothing leather acid leather into a rotary drum, controlling the temperature at 30-40 ℃, controlling the liquid ratio at 100-300%, adding 0.5-3% of inorganic acid and 5-20% of industrial salt, adjusting the pH value to 2-5, and softening for 0.5-2 h;
(2) extracting alkali, adding 1-2% inorganic alkali, adjusting pH to 4-6, and maintaining for 1-3 hr;
(3) tanning, controlling the temperature to be 35-45 ℃, controlling the liquid ratio to be 100-200%, wherein the tanning is divided into three stages, adding 5-10% of coriaria tannin extract at the early stage, the tanning time is 0.5-1h, adding 10-20% of coriaria tannin extract at the middle stage, the tanning time is 1-2h, adding 10-20% of coriaria tannin extract at the later stage, and the tanning time is 1-3 h;
(4) neutralizing, adding 0.5-2% organic base, adjusting pH to 4.5-6.5, and neutralizing for 1-2 h;
(5) and (5) taking out the leather from the drum and building a bridge, taking out the neutralized leather, and standing at room temperature for 10-20h to finish the tanning of the leather.
2. A leather main tanning process as claimed in claim 1, wherein said garment leather sour skin of step (1) comprises sour skin raw material made from sheepskin, cowhide, pigskin.
3. A leather main tanning process as claimed in claim 1, wherein said inorganic acid of step (1) comprises a mixture of one or more of hydrochloric acid, sulfuric acid, nitric acid, phosphoric acid.
4. A leather tanning process as claimed in claim 1 wherein said industrial salt of step (1) comprises a mixture of one or more of sodium chloride, potassium chloride, calcium chloride, sodium sulfate, potassium sulfate, sodium sulfite, sodium hyposulfite, sodium thiosulfate.
5. A leather main tanning process as claimed in claim 1, wherein said inorganic base in step (2) is a mixture of one or more of sodium hydroxide, potassium hydroxide, calcium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate.
6. A leather main tanning process as claimed in claim 1, wherein said coriander extract of step (3) is a tannin-rich extract prepared from coriander leaves or coriander bark.
7. A leather main tanning process as claimed in claim 1, wherein said organic base in step (4) is a mixture of one or more of sodium formate, calcium formate, potassium formate, sodium acetate, calcium acetate, potassium acetate, sodium oxalate.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174681.6A CN109762950B (en) | 2019-03-08 | 2019-03-08 | Tanning process for leather main tanning |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910174681.6A CN109762950B (en) | 2019-03-08 | 2019-03-08 | Tanning process for leather main tanning |
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| CN109762950A CN109762950A (en) | 2019-05-17 |
| CN109762950B true CN109762950B (en) | 2021-11-02 |
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| CN201910174681.6A Expired - Fee Related CN109762950B (en) | 2019-03-08 | 2019-03-08 | Tanning process for leather main tanning |
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| CN113718067A (en) * | 2021-09-06 | 2021-11-30 | 广州施华科技有限公司 | Novel Ecotan leather tanning process |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104962667A (en) * | 2015-06-23 | 2015-10-07 | 兴业皮革科技股份有限公司 | Quick producing process for pure vegetable tanning cattle leather |
| CN105803131A (en) * | 2014-12-29 | 2016-07-27 | 焦作隆丰皮草企业有限公司 | Tanning method of leather |
| CN106755630A (en) * | 2017-01-09 | 2017-05-31 | 河北科技大学 | A kind of leather tanning method |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803131A (en) * | 2014-12-29 | 2016-07-27 | 焦作隆丰皮草企业有限公司 | Tanning method of leather |
| CN104962667A (en) * | 2015-06-23 | 2015-10-07 | 兴业皮革科技股份有限公司 | Quick producing process for pure vegetable tanning cattle leather |
| CN106755630A (en) * | 2017-01-09 | 2017-05-31 | 河北科技大学 | A kind of leather tanning method |
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