CH315326A - Process for soaking untanned hides and hides with protein-splitting enzymes - Google Patents
Process for soaking untanned hides and hides with protein-splitting enzymesInfo
- Publication number
- CH315326A CH315326A CH315326DA CH315326A CH 315326 A CH315326 A CH 315326A CH 315326D A CH315326D A CH 315326DA CH 315326 A CH315326 A CH 315326A
- Authority
- CH
- Switzerland
- Prior art keywords
- hides
- enzymes
- soaking
- protein
- treatment
- Prior art date
Links
- 102000004190 Enzymes Human genes 0.000 title claims description 15
- 108090000790 Enzymes Proteins 0.000 title claims description 15
- 238000000034 method Methods 0.000 title claims description 12
- 238000002791 soaking Methods 0.000 title claims description 7
- 239000000080 wetting agent Substances 0.000 claims description 7
- 150000001875 compounds Chemical class 0.000 claims description 6
- 150000003863 ammonium salts Chemical class 0.000 claims description 4
- 239000003755 preservative agent Substances 0.000 claims description 2
- 230000002335 preservative effect Effects 0.000 claims description 2
- 229940088598 enzyme Drugs 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 108091005804 Peptidases Proteins 0.000 description 5
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 5
- 235000010267 sodium hydrogen sulphite Nutrition 0.000 description 5
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 4
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 4
- 235000011130 ammonium sulphate Nutrition 0.000 description 4
- 102000035195 Peptidases Human genes 0.000 description 3
- 239000004365 Protease Substances 0.000 description 3
- 102000001400 Tryptase Human genes 0.000 description 3
- 108060005989 Tryptase Proteins 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
- 239000010985 leather Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229920000151 polyglycol Polymers 0.000 description 3
- 239000010695 polyglycol Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 102100037486 Reverse transcriptase/ribonuclease H Human genes 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 230000002538 fungal effect Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 229940024999 proteolytic enzymes for treatment of wounds and ulcers Drugs 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 241000228230 Aspergillus parasiticus Species 0.000 description 1
- 241000283690 Bos taurus Species 0.000 description 1
- 241000283707 Capra Species 0.000 description 1
- -1 N-substituted aminocarboxylic acids Chemical class 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000008055 alkyl aryl sulfonates Chemical class 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 239000001166 ammonium sulphate Substances 0.000 description 1
- 125000002091 cationic group Chemical group 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000007859 condensation product Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000002951 depilatory effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004945 emulsification Methods 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 230000037390 scarring Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000004289 sodium hydrogen sulphite Substances 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229920001864 tannin Polymers 0.000 description 1
- 239000001648 tannin Substances 0.000 description 1
- 235000018553 tannin Nutrition 0.000 description 1
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
- C14C1/00—Chemical treatment prior to tanning
- C14C1/04—Soaking
Landscapes
- 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)
Description
Verfahren zum Weichen von umgegerbten Fellen und Häuten mit eiweissspaltenden Enzymen Es ist bekannt, bei der Lederherstellung enzymansche Produkte zum Beizen von ge- äscherten Fellen und Häuten zu verwenden. Weiterhin hat man proteolytische Enzyme als Enthaarungsmittel nutzbar gemacht. Enzyme der Bauchspeicheldrüse hat man ferner als Weichmittel in alkalischer Lösung für Pelz felle und in neutraler Lösung für die Leder herstellung vorgeschlagen. Dabei hat sieh aber gezeigt, dass beim Arbeiten in alkalischer Lösung die Haare gelockert werden, so dass sich dieses Verfahren für die Vorbehandlung von Fellen für die Pelzzurichtung nicht ein führen konnte.
Ausserdem ist in alkalischer Lösung und auch in neutralem Medium der Angriff auf die Hautsubstanz so stark, dass sich dieses Verfahren auch für die Lederher stellung nicht bewährt hat.
Gegenstand der Erfindung ist nun ein Verfahren zum Weichen von umgegerbten Fel len und Häuten mit eiweissspaltenden Enzy men, das dadurch gekennzeichnet ist, dass man die Behandlung mit den Enzymen in Gegen wart von Ammoniumsalzen und reduzierend wirkenden Verbindungen bei einem PH unter 7 vornimmt.
Es wurde nämlich überraschenderweise ge funden, dass die oben angeführten Nachteile beim Arbeiten nach dem erfindungsgemässen Verfahren vermieden werden. Man kann da bei nicht nur mit Enzymen der Bauchspei- cheldrüse, sondern auch mit andern proteo- lytisehen Enzymen, wie Pilztryptasen und Bakterienproteasen, arbeiten. Die letzteren haben sich sogar als besonders wirksam er wiesen. Zur Erzielung bestimmter Effekte können auch mehrere solcher Enzyme gemein sam verwendet werden.
Bei getrockneter Rohware bietet diese Me thode die Möglichkeit, bei der Durchführung der Weiche bei einem pH unter 7 ohne irgend welche Nachteile für die Haut die Weichdauer erheblich abzukürzen. Die Haut wird dabei so gründlich durchgeweicht, dass die Äscher- chemikalien gleichmässig und ohne den ge fürchteten Narbenzug aufgenommen werden. Dieses gründliche Durchweichen der Haut wirkt sieh zudem sehr günstig auf die Auf nahme von Gerbstoffen bei der Pelzzurich tung aus. Diese Vorteile hat man aber nicht nur bei getrockneter Rohware, sondern auch bei Behandlung von gesalzenen Fehlen nach dem vorliegenden Verfahren.
Zusammen mit den angeführten Enzymen kann man auch mit diesen verträgliche Netz mittel verwenden. Es besteht aber auch die Möglichkeit, solche Netzmittel vor der An wendung der Enzyme auf die Felle zur Ein wirkung zu bringen. Als Netzmittel für die Vorbehandlung kommen z. B. Fettalkoholsul- fonate, Fettsäurekondensationsprodukte und Alkylarylsulfonate in Betracht, nichtionogene Produkte, wie z. B. Polyglykoläther, oder kationaktive Produkte, wie z. B. quartäre Ammoniumsalze.
Für die gleichzeitige Ver wendung zusammen mit dem Enzym kommen vor allem nichtionogene Netzmittel wie Poly- glykoläther oder andere damit verträgliche, wie N-substituierte Aminocarbonsäuren, in Frage.
Die Kombination mit Netzmitteln unter stützt die Enzymwirkung und wirkt zudem günstig auf die Emulgierung von Naturfett. Beispiele 1. Trockene Ziegenfelle werden in der Grube mit 1000 % Wasser und 1% Netzmittel 24 Stunden vorbehandelt. Anschliessend wird im Fass mit 60 % Wasser 1 % Pilztryptase aus Aspergillus parasiticus 0,5 % Ammoniumsulfat 0,5 % Natriumbisulfit 2 Stunden gewalkt. über Nacht wird mit ge wöhnlichem Wasser nachbehandelt.
2. Trockene Schaffelle werden in der Grube mit 1000 % Nasser 1% Pankreastryptase 1 % Natriumbisulfit 1% Ammoniumsulfat 2 Tage bei PH 6 geweicht. 3. Trockene südafrikanische Rinderhäute werden in der Grube mit 1000 % Wasser 2 % Bakterienprotease 1 % Natriumbisulfit 1 % Ammoniumchlorid 3 T e , 3 Tage geweicht. 4. Gesalzene Kalbfelle werden in der Grube mit 500 % Wasser 0,5 % Pilztry ptase 0,3 % Natriumbisulfit 0,3 % Ammonsulfat über Nacht geweicht. 5. Trockene Lammfelle werden mit 1000 % Wasser 1 % Bakterienprotease 0,5 % Polyglykoläther 1 % Ammoniumsulfat 0,3 % Natriumbisulfit geweicht. Mit Vorteil können die Felle und Häute vor, während oder nach dem Weichverfahren mit konservierend wirkenden Verbindungen, wie z.
B. mit dem Natriumsalz des para-Di- ehlorkresols, behandelt werden.
Process for soaking tanned pelts and hides with protein-splitting enzymes It is known to use enzyme-like products in leather production for the dressing of ashed skins and hides. Furthermore, proteolytic enzymes have been made useful as depilatory agents. Pancreatic enzymes have also been proposed as softeners in alkaline solution for fur skins and in neutral solution for leather manufacture. However, it has shown that when working in an alkaline solution, the hair is loosened, so that this process could not be used for the pretreatment of pelts for fur finishing.
In addition, the attack on the skin substance is so strong in an alkaline solution and in a neutral medium that this method has not proven itself for leather manufacture either.
The invention now relates to a method for soaking tanned fel len and skins with protein-splitting enzymes, which is characterized in that the treatment with the enzymes is carried out in the presence of ammonium salts and reducing compounds at a pH below 7.
It has been found, surprisingly, that the disadvantages listed above are avoided when working according to the method according to the invention. You can not only work with pancreatic enzymes, but also with other proteolytic enzymes such as fungal tryptases and bacterial proteases. The latter have even proven to be particularly effective. Several such enzymes can be used together to achieve certain effects.
In the case of dried raw material, this method offers the possibility of shortening the soaking time considerably when carrying out the soaking at a pH below 7 without any disadvantages for the skin. The skin is so thoroughly soaked that the liming chemicals are absorbed evenly and without the dreaded scarring. This thorough soaking of the skin also has a very beneficial effect on the absorption of tannins during fur finishing. These advantages are not only obtained with dried raw material, but also with the treatment of salted deficiencies according to the present process.
Together with the listed enzymes you can also use compatible wetting agents. But there is also the possibility of applying such wetting agents to the skins before applying the enzymes. As wetting agents for the pretreatment, for. B. Fettalkoholsul- fonate, fatty acid condensation products and alkylarylsulfonates into consideration, nonionic products such. B. polyglycol ethers, or cationic products such. B. quaternary ammonium salts.
For the simultaneous use together with the enzyme, non-ionic wetting agents such as polyglycol ethers or other compatible with them, such as N-substituted aminocarboxylic acids, are particularly suitable.
The combination with wetting agents supports the enzyme action and also has a beneficial effect on the emulsification of natural fat. Examples 1. Dry goat skins are pretreated in the pit with 1000% water and 1% wetting agent for 24 hours. Then 1% fungal tryptase from Aspergillus parasiticus 0.5% ammonium sulphate 0.5% sodium bisulphite is drummed for 2 hours in a barrel with 60% water. Post-treatment is carried out overnight with ordinary water.
2. Dry sheepskins are soaked in the pit with 1000% wet 1% pancreatic stryptase 1% sodium bisulfite 1% ammonium sulfate for 2 days at pH 6. 3. Dry South African cattle hides are soaked in the pit with 1000% water, 2% bacterial protease, 1% sodium bisulfite, 1% ammonium chloride, 3 days for 3 days. 4. Salted calfskins are soaked overnight in the pit with 500% water, 0.5% mushroom tryptase, 0.3% sodium bisulfite, 0.3% ammonium sulfate. 5. Dry lambskins are soaked with 1000% water 1% bacterial protease 0.5% polyglycol ether 1% ammonium sulfate 0.3% sodium bisulfite. Advantageously, the pelts and hides before, during or after the softening process with preservative compounds, such as.
B. be treated with the sodium salt of para-dichlorocresol.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DER16467A DE1022350B (en) | 1952-07-15 | 1952-07-15 | Give way to furs and skins |
Publications (1)
Publication Number | Publication Date |
---|---|
CH315326A true CH315326A (en) | 1956-08-15 |
Family
ID=7399744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH315326D CH315326A (en) | 1952-07-15 | 1953-03-17 | Process for soaking untanned hides and hides with protein-splitting enzymes |
Country Status (5)
Country | Link |
---|---|
BE (1) | BE518676A (en) |
CH (1) | CH315326A (en) |
DE (1) | DE1022350B (en) |
FR (1) | FR1071400A (en) |
NL (2) | NL83849C (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3312840A1 (en) * | 1983-04-09 | 1984-10-11 | Röhm GmbH, 6100 Darmstadt | Method for the wet degreasing of hide material |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT155132B (en) * | 1935-10-19 | 1938-11-25 | Otto Dr Roehm | Process for the production of pelts ready for tanning. |
FR49233E (en) * | 1938-03-01 | 1938-12-07 | Process for preparing skins using fiery tryptases | |
DE721885C (en) * | 1938-04-14 | 1942-06-23 | A Th Boehme Chem Fabrik | Process for the production of bare |
-
1952
- 1952-07-15 DE DER16467A patent/DE1022350B/en active Pending
-
1953
- 1953-01-31 NL NL175735A patent/NL83849C/en active
- 1953-02-23 FR FR1071400D patent/FR1071400A/en not_active Expired
- 1953-03-17 CH CH315326D patent/CH315326A/en unknown
- 1953-03-24 BE BE518676A patent/BE518676A/fr unknown
-
1956
- 1956-02-07 NL NL204305A patent/NL91845C/en active
Also Published As
Publication number | Publication date |
---|---|
FR1071400A (en) | 1954-08-31 |
DE1022350B (en) | 1958-01-09 |
BE518676A (en) | 1955-03-04 |
NL83849C (en) | 1957-01-15 |
NL91845C (en) | 1959-08-15 |
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