BE518676A - - Google Patents
Info
- Publication number
- BE518676A BE518676A BE518676A BE518676A BE518676A BE 518676 A BE518676 A BE 518676A BE 518676 A BE518676 A BE 518676A BE 518676 A BE518676 A BE 518676A BE 518676 A BE518676 A BE 518676A
- Authority
- BE
- Belgium
- Prior art keywords
- skins
- enzymes
- water
- dried
- leather
- Prior art date
Links
- 238000000034 method Methods 0.000 claims description 7
- 239000000080 wetting agent Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 3
- 230000002335 preservative effect Effects 0.000 claims 1
- 102000004190 Enzymes Human genes 0.000 description 7
- 108090000790 Enzymes Proteins 0.000 description 7
- 229940088598 enzyme Drugs 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 108091005804 Peptidases Proteins 0.000 description 5
- 102000035195 Peptidases Human genes 0.000 description 5
- DWAQJAXMDSEUJJ-UHFFFAOYSA-M Sodium bisulfite Chemical compound [Na+].OS([O-])=O DWAQJAXMDSEUJJ-UHFFFAOYSA-M 0.000 description 5
- 239000010985 leather Substances 0.000 description 5
- 238000002791 soaking Methods 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
- 108060005989 Tryptase Proteins 0.000 description 3
- 102000001400 Tryptase Human genes 0.000 description 3
- 239000012670 alkaline solution Substances 0.000 description 3
- 230000001580 bacterial effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 229940024999 proteolytic enzymes for treatment of wounds and ulcers Drugs 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
- 239000004365 Protease Substances 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000002255 enzymatic 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
- 229920000151 polyglycol Polymers 0.000 description 2
- 239000010695 polyglycol Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 241000228230 Aspergillus parasiticus Species 0.000 description 1
- 241000283707 Capra Species 0.000 description 1
- 101000795074 Homo sapiens Tryptase alpha/beta-1 Proteins 0.000 description 1
- 235000019687 Lamb Nutrition 0.000 description 1
- 108010019160 Pancreatin Proteins 0.000 description 1
- 101710180319 Protease 1 Proteins 0.000 description 1
- 101710137710 Thioesterase 1/protease 1/lysophospholipase L1 Proteins 0.000 description 1
- 102100029639 Tryptase alpha/beta-1 Human genes 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003929 acidic solution Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 150000008055 alkyl aryl sulfonates Chemical class 0.000 description 1
- 235000019270 ammonium chloride Nutrition 0.000 description 1
- 235000015278 beef Nutrition 0.000 description 1
- 244000309466 calf Species 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
- 230000002478 diastatic effect Effects 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 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
- 150000002191 fatty alcohols Chemical class 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- -1 for example Substances 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
- 210000000496 pancreas Anatomy 0.000 description 1
- 229940055695 pancreatin Drugs 0.000 description 1
- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 150000003871 sulfonates Chemical class 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
- 238000004018 waxing Methods 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
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TRAITEMENT ENZYMATIQUE DE PEAUX ET CUIRS.
Dans la fabrication du cuir, il est connu d'employer des pro- duits enzymatiques (diastasiques) pour confire ou déchauler les peaux et cuirs enchaussenés. En outre, on a employé des enzymes protéolytiques comme épilants. On a encore proposé les enzymes du pancréas (pancréatine) comme agent de trempage ou reverdissage en solution alcaline pour les peaux à fourrure et en solution neutre pour la fabrication du cuir. Dans ce cas, on a cependant constaté que, lorsqu'on travaille en solution alcaline, les poils sont relâchés,de sorte que ce procédé n'a pas pu s'introduire pour le trai- tement préalable des peaux pour le tannage des fourrures. En outre, en solu- tion alcaline et même en milieu neutre, l'attaque de la substance de la peau est tellement forte que ce procédé n'a pas donné de bons résultats même pour la fabrication du cuir.
Or, selon la présente invention, on a constaté que, chose sur- prenante, lorsqu'on travaille en solution faiblement acide en présence de sels d'ammonium et de composés réducteurs, ces inconvénients sont évités.
Dans le procédé selon l'invention, on peut travailler non seulement avec des enzymes du pancréas, mais encore avec d'autres enzymes protéolytiques, tel- les que les tryptases fongiques et les protéases bactériennes. Ces dernières se sont même révélées particulièrement efficaces. Pour obtenir des effets dé- terminés, on peut aussi employer de telles enzymes ensemble.
Pour les peaux et cuirs bruts séchés, cette méthode offre la pos- sibilité, en effectuant le trempage à un pH inférieur à 7, de réduire consi- dérablement la durée du trempage sans aucune espèce d'inconvénients pour la peau. Celle-ci est ici trempée si complètement que les produits chimiques d'enchaussenage sont absorbés uniformément et sans la déformation du grain, qui est si redoutée.
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Ce trempage profond de la peau ou cuir exerce en outre une in- fluence très favorable sur l'absorption des tanins lors du tannage des four- rures. On a ces avantages non seulement pour les peaux et cuirs bruts séchés, mais encore lorsqu'on traite selon l'invention des peaux et cuirs salés.
En même temps que les enzymes citées, on peut aussi employer des mouillants compatibles avec elles. Il est toutefois possible également de faire agir ces mouillants sur la peau avant l'emploi de l'enzyme.
Gomme mouillants pour le traitement préalable, on peut employer, par exemple, des sulfonates d'alcools gras, des produits de condensation d'a- cides gras et des sulfonates alcoylaryliques, des produits non ionogènes, tels que par exemple les éthers polyglycoliques ou des produits à activité cationique, tels que, par exemple, les sels d'ammonium quaternaires. Pour l'emploi simultané avec l'enzyme, ce sont surtout les mouillants non ionogè- nes, tels que les éthers polyglycoliques ou d'autres compatibles avec eux, tels que les acides eminocarboxyliques substitués sur N, qui entrent en con- sidération.
La combinaison avec les mouillants favorise l'action des enzy- mes et agit en outre favorablement sur l'émulsionnement de la graisse natu- relle.
Exemples
1. Des peaux de chèvre séchées sont traitées préalablement, pen- dant 24 heures, par 1000% d'eau et
1% de mouillant.
Ensuite, on foule au tonneau, pendant 2 heures, avec 60% d'eau 1% de tryptase d'aspergillus-parasiticus
0,5% de sulfate d'ammonium
0,5% de bisulfite de sodium.
On traite ensuite, pendant une nuit, avec de l'eau ordinaire.
2. Des peaux de mouton séchées sont mises à tremper dans la fos- se, pendant 2 jours, avec
1000% d'eau
1% de tryptase de pancréas
1% de bisulfite de sodium
1% de sulfate d'ammonium le pH de cette solution étant égal à 6.
3. Des cuirs de boeuf sud-africains séchés sont mis à tremper, pendant 3 jours, dans la fosse avec
1000% d'eau
2% de protéase bactérienne
1% de bisulfite de sodium
1% de chlorure d'ammonium.
4. Des peaux de veau salées sont mises à tremper dans la fosse, pendant une nuit, avec
500% d'eau
0,5% de tryptase fongique
0,3% de bisulfite de sodium 0,3% de sulfate ammoinique.
<Desc/Clms Page number 3>
5. Des peaux d'agneau séchées sont mises à tremper avec
1000% d'eau
1% de protéase bactérienne 0,5% d'éther polyglycolique
1% de sulfate d'ammonium
0,3% de bisulfite de so'dium.
REVENDICATIONS.
1. Procédé de trempage des peaux et cuirs avec des enzymes pro- téolytiques, caractérisé en ce qu'on travaille en présence de sels d'ammo- nium et de composés réducteurs, à un pH inférieur à 7.
<Desc / Clms Page number 1>
ENZYMATIC TREATMENT OF SKIN AND LEATHER.
In the manufacture of leather, it is known to use enzymatic products (diastatic) for waxing or loosening chaffed skins and leathers. In addition, proteolytic enzymes have been employed as depilants. Pancreatic enzymes (pancreatin) have also been proposed as a soaking or greening agent in alkaline solution for fur skins and in neutral solution for the manufacture of leather. In this case, however, it has been found that, when working in an alkaline solution, the hairs are loosened, so that this process could not be introduced for the pretreatment of the hides for the tanning of the furs. In addition, in alkaline solution and even in neutral medium, the attack on the substance of the skin is so strong that this process has not given good results even in the manufacture of leather.
Now, according to the present invention, it has been found that, surprisingly, when working in a weakly acidic solution in the presence of ammonium salts and reducing compounds, these drawbacks are avoided.
In the process according to the invention, it is possible to work not only with enzymes from the pancreas, but also with other proteolytic enzymes, such as fungal tryptases and bacterial proteases. The latter have even proved particularly effective. To achieve definite effects, such enzymes can also be used together.
For dried skins and raw leathers, this method offers the possibility, by carrying out the soaking at a pH below 7, of considerably reducing the duration of the soaking without any kind of disadvantage for the skin. This here is soaked so completely that the footprint chemicals are absorbed evenly and without the dreaded grain deformation.
<Desc / Clms Page number 2>
This deep soaking of the skin or leather also has a very favorable influence on the absorption of tannins during the tanning of furs. We have these advantages not only for dried skins and raw leathers, but also when treating salted skins and leathers according to the invention.
At the same time as the enzymes mentioned, it is also possible to use wetting agents compatible with them. However, it is also possible to cause these wetting agents to act on the skin before the use of the enzyme.
Wetting gums for the pretreatment, for example, sulfonates of fatty alcohols, condensation products of fatty acids and alkylaryl sulfonates, nonionogenic products, such as, for example, polyglycol ethers or products with cationic activity, such as, for example, quaternary ammonium salts. For simultaneous use with the enzyme, it is especially nonionogenic wetting agents, such as polyglycol ethers or others compatible with them, such as N-substituted eminocarboxylic acids, which are considered.
The combination with wetting agents promotes the action of the enzymes and also acts favorably on the emulsification of natural fat.
Examples
1. Dried goat skins are pre-treated for 24 hours with 1000% water and
1% wetting.
Then we barrel crush for 2 hours with 60% water 1% tryptase of aspergillus-parasiticus
0.5% ammonium sulfate
0.5% sodium bisulfite.
It is then treated overnight with ordinary water.
2. Dried sheepskins are soaked in the pit for 2 days with
1000% water
1% pancreatic tryptase
1% sodium bisulfite
1% ammonium sulfate, the pH of this solution being equal to 6.
3. Dried South African beef hides are soaked for 3 days in the pit with
1000% water
2% bacterial protease
1% sodium bisulfite
1% ammonium chloride.
4. Salted calf skins are soaked in the pit overnight, with
500% water
0.5% fungal tryptase
0.3% sodium bisulfite 0.3% ammonium sulfate.
<Desc / Clms Page number 3>
5. Dried lamb skins are soaked with
1000% water
1% bacterial protease 0.5% polyglycolic ether
1% ammonium sulfate
0.3% sodium bisulfite.
CLAIMS.
1. Process for soaking skins and leathers with proteolytic enzymes, characterized in that it works in the presence of ammonium salts and reducing compounds, at a pH below 7.
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 |
---|---|
BE518676A true BE518676A (en) | 1955-03-04 |
Family
ID=7399744
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
BE518676A BE518676A (en) | 1952-07-15 | 1953-03-24 |
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) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2543974A1 (en) * | 1983-04-09 | 1984-10-12 | Roehm Gmbh | PROCESS FOR THE ENZYMATIC ATTACK OF SKIN MOUTH |
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
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2543974A1 (en) * | 1983-04-09 | 1984-10-12 | Roehm Gmbh | PROCESS FOR THE ENZYMATIC ATTACK OF SKIN MOUTH |
Also Published As
Publication number | Publication date |
---|---|
DE1022350B (en) | 1958-01-09 |
FR1071400A (en) | 1954-08-31 |
NL91845C (en) | 1959-08-15 |
CH315326A (en) | 1956-08-15 |
NL83849C (en) | 1957-01-15 |
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