EP3402905A1 - Lederhydrophobierungsverfahren und damit hergestelltes leder - Google Patents
Lederhydrophobierungsverfahren und damit hergestelltes lederInfo
- Publication number
- EP3402905A1 EP3402905A1 EP17700338.1A EP17700338A EP3402905A1 EP 3402905 A1 EP3402905 A1 EP 3402905A1 EP 17700338 A EP17700338 A EP 17700338A EP 3402905 A1 EP3402905 A1 EP 3402905A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- leather
- pressure
- pressure vessel
- compressed gas
- process according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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
- C14C9/00—Impregnating leather for preserving, waterproofing, making resistant to heat or similar purposes
Definitions
- the present invention relates to a leather hydrophobization process and leather made therewith.
- the term “leather” is understood to mean tanned collagen-containing material, with and without hair, which has been obtained by a preceding tanning process.
- the term “leather” therefore includes not only leather as such, but also furs and skins made from animal hides or skins.
- the leather can be derived from any animal such as cattle, sheep, goats, pigs, buffalos, birds, reptiles, etc.
- the tanning process by which the leather is obtained may be a mineral, vegetable or synthetic tanning process, according to the type of Tanning used tannins (mineral salts, vegetable tannins, synthetic tanning agents).
- the term “leather” further includes leather of any thickness, for example, very thin bag leather, but also very thick sole leather.
- Conventional tanning processes for the manufacture of leather include a series of aqueous baths in which the raw material is treated to become leather. These aqueous baths are divided into the works in the so-called water workshop, the actual tanning and retanning.
- the aqueous baths therefore comprise all operations which are carried out in an aqueous medium for the production of leather. These include, for example, weeping, dehairing (ashening), pimpling, tanning, retanning, fatting, dyeing, etc.
- the individual treatment processes in this leather production are well known to those skilled in the art and therefore need not be further explained.
- the present disclosure is “leather”. Also tanned, treated and dried collagen-containing material before the state “crust” is thus “leather”.
- the term “crust” refers to the condition of an animal's skin before the so-called finishing, that is to say before the final surface appearance applied to the surface.
- finishing that is to say before the final surface appearance applied to the surface.
- tanned, treated and dried collagen-containing material which, after drying, has not been subjected to any mechanical work such as, for example, the tunnel or millen.
- Freshly tanned leather is wet or at least moist and needs to be dried.
- so-called tunnel dryers are used, in which the leather is dried by means of elevated temperature, or so-called vacuum dryer, in which the leather is dried by applying a vacuum at optionally also elevated temperature.
- leather Even when dried, however, leather contains bound water. Excessive drying, with which the water bound in the leather would be partially or even completely removed, is undesirable because this would cause embrittlement and degeneration of the leather. Overly dried leather becomes brittle and therefore unusable.
- dry leather is therefore understood to mean tanned collagen-containing material which has been dried for at least 48 hours at 50 ° C.
- dry leather in the context of this disclosure, by definition, this dry leather has a water content of 0% by weight, although it still contains water bound in the leather. "Increased water content” is used in the context of this disclosure if the leather contains more water than the water which is bound in the leather after the described drying, i. if there is free water in the leather.
- Collagen-containing material and thus the hides used as the raw material for leather production, naturally has a certain proportion of ionizable and non-ionizable functional groups.
- the proportion of these groups varies depending on the chemicals used. For example, in chrome tanning, the proportion of acidic carboxy groups is reduced. If vegetable tanning agents are used for tanning, the proportion of OH groups increases significantly due to the hydroxyl groups present in the vegetable tannins. Due to the natural origin of collagen-containing material and a large number of different leather chemicals that can be used in the leather manufacturing process, a general statement about the shares of the existing functional groups and thus also on the later bound in the leather after drying water is not possible.
- leather is mainly used in the footwear and clothing industry, in the automotive industry and in the furniture industry. In the mentioned fields of application it is increasingly required that the leather is water-repellent, ie has a high resistance to water penetration. Unfortunately, leather is hydrophilic, especially vegetable tanned leather, which is why the required water-repellent properties represent a major challenge for the leather industry.
- hydrophobic substances such as oils, fats, waxes, paraffins, fluorocarbons and hydrophobized polymers in the leather structure. This is usually done in an aqueous medium before, during or after retanning using emulsifiers which allow a sufficiently fine distribution of the water-insoluble hydrophobizing agents in the aqueous phase.
- the emulsions must be in a subsequent process step
- known leather hydrophobization methods not only improve the water-repellent properties of the leather but also increase its softness. Sometimes this is a positive side-effect, but in other cases this is disadvantageous, for example for products requiring special strength, such as shoe soles. Furthermore, especially leather products which require high strength are produced using a high proportion of hydrophilic vegetable tanning agents which embed themselves in the leather and prevent or at least greatly hinder a water-repellent finish by means of conventional hydrophobization processes. A permanent and complete, ie continuous hydrophobing especially of vegetable and / or synthetic tanned leather is therefore not yet known. Only superficially applied systems for hydrophobing fail at higher mechanical stress, such as occurs in the area of shoe leather, quickly and therefore do not represent a satisfactory solution.
- the present invention has set itself the goal of providing a Lederhydrophobi mecanicsclar which allows a long-term stable, complete and process technically well reproducible hydrophobing of vegetable and / or synthetic tanned leather in particular, so that by means of this method also deep hydrophobized leather can be produced, which for example as Shoe leather can be used.
- the mixture used to treat the leather does not have to be supplied to the pressure vessel as such, but only has to be produced during treatment.
- the hydrophobizing agent can be supplied to the pressure vessel before a pressure build-up, during a pressure build-up, during a pressure hold time or even during the relaxation of the pressure vessel.
- the water repellent can already be brought into contact with the leather to be treated before the leather is introduced into the pressure vessel. It is only important that during the treatment of the leather, a mixture of the compressed gas and the hydrophobing agent is formed. In other words, the hydrophobing agent used must be at least partially soluble in the compressed gas.
- compressed C0 2 is preferably used as the compressed gas.
- other compressed gases may also be used, for example carbon monoxide, ethane, propane, pentane, ammonia, fluorine-chlorine-alkanes and mixtures of these substances.
- the hydrophobizing agent dissolved in the compressed gas can also completely penetrate thick leathers due to the low viscosity and excellent diffusion properties of the compressed gas, and thus achieve deep hydrophobization.
- the penetration of the In particular, the hydrophobizing agent dissolved in the compressed gas can be controlled over the duration of the treatment, so that only shallow layers of the leather can be rendered hydrophobic by means of a suitable, relatively short treatment time, if so desired.
- Hydrophobizing agents which can be used are reactive polymers, hydrocarbons, silanes, silanols and siloxanes, which preferably have one or more epoxide, ester, carboxyl, anhydride, amine, hydroxide and / or halide functional groups.
- Particularly preferred according to the present invention is the use of a hydrophobing agent which consists of at least one silane and / or silanol and / or siloxane.
- a hydrophobing agent which consists of at least one silane and / or silanol and / or siloxane.
- compounds of the type alkylsilanol, alkoxysilane, alkylchlorosilane and organofunctionalized silanes are outstandingly suitable as water repellents in the process according to the invention.
- These may be monofunctional, difunctional and / or trifunctional compounds.
- these compounds have the general form Ri (i-3) R2 (o-2) -SiX (i -3 ), wherein Ri denotes a hydrophobic group, R 2 denotes an organically functionalized radical and X a hydrolyzable group, usually one Alkoxy, more rarely a chlorine group represents.
- Ri denotes a hydrophobic group
- R 2 denotes an organically functionalized radical
- X a hydrolyzable group, usually one Alkoxy, more rarely a chlorine group represents.
- the organically functionalized R 2 groups may additionally have functional groups capable of forming covalent bonds with the hydroxyl and the hydroxyl groups
- Such additional functional groups can be amino, epoxide, ester and carboxy groups.
- Examples of compounds having such additional functional groups are 3-aminopropyltrimethoxysilane, 3-ureidopropyltrimethoxysilane and 3-glycidoxypropyltrimethoxysilane.
- alkoxysilanes are particularly preferred as water repellents Al kylmethoxysilane, wherein alkyl is Ci to C 2 o-alkyl.
- alkylmethoxysilanes are dialkylmethoxysilane, alkyltrimethoxysilane and mixtures of these substances.
- Very particular preference is given to hexadecyltrimethoxysilane, isooctyltrimethoxysilane, dimethyldiethoxysilane, phenyltriethoxysilane or mixtures of the abovementioned substances.
- alkylalkoxysilanes but also alkylchlorosilanes, hydrolyze to give alkylsilanols which can polymerize with elimination of water or react with nucleophilic reagents such as, for example, hydroxyl groups, carboxyl groups and / or amines. no tendency can bind.
- nucleophilic reagents such as, for example, hydroxyl groups, carboxyl groups and / or amines. no tendency can bind.
- the hydrophobizing agent is fixed in the leather or incorporated into the leather, whereby the desired long-term stable and insensitive to mechanical stress hydrophobing of the leather is achieved.
- silanols are used as hydrophobing agents
- alkyl silanols such as, for example, Methylsilanoltriol, diphenylsilanediol and / or trimethylsilanol
- silanols in particular alkyl silanols, therefore leather with little or no residual water content can be well hydrophobed.
- the compressed gas After treating the leather with the mixture of compressed gas and hydrophobizing agent, the compressed gas is depressurized to ambient pressure and non-leather-fixed hydrophobing agent is separated.
- the gas used as well as the excess hydrophobizing agent separated from the gas can be reused.
- a wastewater treatment is not necessary because in principle no wastewater is obtained in the leather hydrophobization process according to the invention.
- the main advantage of the process according to the invention is the possibility of long-term stable hydrophobing of a large variety of collagenous materials regardless of the nature of the starting material and regardless of the nature of the leather production process.
- the hydrophobing process according to the invention for example, both soft chrome leather and vegetable and / or synthetically tanned leather of high strength can be rendered hydrophobic.
- the hydrophobizing agent specifically contains solid chemical binders. fertilize with the collagen and / or the substances bound in the collagen. Furthermore, according to the invention, the hydrophobizing agent can crosslink with itself and thus form a hydrophobic network in the leather.
- the hydrophobic treatment according to the process of the invention is not carried out during the working steps which occur in conventional leather production in aqueous baths.
- the intermediate "leather” is hydrophobicized, which has been obtained from a kind of leather manufacturing process of any kind.
- the water content of the leather i. the content of free water, between 0 wt .-% and 25 wt .-% amount.
- the specification of a water content of 0% by weight does not mean that no water is present in the leather at all, but this indication means that exclusively bound water is present in the leather, but no free water.
- the term "25% by weight of water content” therefore means that in addition to the bound water, free water is still present in the leather in a proportion which corresponds to one quarter of the total weight of the dry leather.
- the quality of the hydrophobing can be improved if not only bound water is contained in the leather provided, but also a certain proportion of free water, but should not exceed 25 wt .-% , Accordingly, in the inventive method of
- Water content of the leather before introducing the leather into the pressure vessel or after the treatment in the pressure vessel to a value between 0 and 25 % By weight.
- the water content of the leather in the pressure vessel to a value between 0 and 25 wt .-% can be adjusted.
- the possibilities for setting an increased water content in leather are many.
- a desired, increased water content of the leather can already be achieved in that the leather is not dried in the drying process until there is only bound water in the leather. Instead, the drying process of the leather can be terminated when the desired, increased water content between 0 and 25 wt .-% is reached.
- the starting product is leather with a water content of 0% by weight and an increased water content is desired
- the increase in the water content can be achieved, for example, by treating the dry leather in a climate chamber in which sufficient air humidity is present, which causes the dry leather to absorb moisture from the air.
- the dry leather can be sprayed or dripped with water. Another option is to add steam or saturated steam to a container containing the dry leather.
- the adjustment of the desired, increased water content during the supply of the compressed gas can be carried out in the pressure vessel, either by dissolving water in the supplied compressed gas or by separately introducing water into the pressure vessel during a supply of the compressed gas.
- the setting of an increased water content can also be done after the introduction of the compressed gas into the pressure vessel, either during a pressure holding period or during the relaxation of the pressure vessel or only after the expansion of the pressure vessel.
- the hydrophobizing agent used in the process according to the invention is preferably supplied to the pressure vessel before a pressure build-up, during the pressure build-up, during a pressure hold time or during the relaxation of the pressure vessel.
- the feeding can be done for example by presenting the hydrophobizing agent in an associated with the pressure vessel feed chamber, by pumping, by spraying and / or by previously dissolving the hydrophobizing agent in the compressed gas. It is also possible, although not preferred, to apply the hydrophobing agent prior to introduction of the leather into the pressure vessel by, for example, pouring on the leather or spraying the leather. It is also possible to add different water repellents in succession.
- the mixture of compressed gas and the hydrophobing agent used i. the dissolution of the hydrophobizing agent in the compressed gas takes place independently of the desired type of hydrophobing alone
- the parameters pressure and temperature, which influence a solution of the hydrophobizing agent in the compressed gas vary depending on the hydrophobing agent used.
- the treatment of the leather takes place advantageously at a pressure of 30 to 300 bar, preferably at a pressure of 50 to 250 bar and more preferably at a pressure of 70 to 200 bar.
- the most suitable pressure for a given hydrophobing agent and a given hydrophobing task may need to be determined by series of tests.
- the treatment of the leather is advantageously carried out at a temperature of 10 ° C to 150 ° C, preferably at a temperature of 20 ° C to 130 ° C and more preferably at a temperature of 30 ° C to 110 ° C, in particular the temperature range of 60 ° C to 80 ° C has been found to be particularly suitable.
- a most suitable temperature is optionally determined by experiment.
- the penetration depth of the hydrophobing agent can be controlled above all over the treatment time. It is obvious that thin leather requires a shorter treatment time to complete penetration with hydrophobing agent than thick leather. According to the invention, the treatment of the leather takes place advantageously for a period of 5 minutes to 10 hours, preferably for 10 minutes to 5 hours and more preferably for 30 minutes to 4 hours.
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)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PL17700338T PL3402905T3 (pl) | 2016-01-12 | 2017-01-12 | Sposób hydrofobizacji skóry i skóra otrzymana tym sposobem |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016000243.3A DE102016000243A1 (de) | 2016-01-12 | 2016-01-12 | Lederhydrophobierungsverfahren und damit hergestelltes Leder |
| PCT/EP2017/050548 WO2017121789A1 (de) | 2016-01-12 | 2017-01-12 | Lederhydrophobierungsverfahren und damit hergestelltes leder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP3402905A1 true EP3402905A1 (de) | 2018-11-21 |
| EP3402905B1 EP3402905B1 (de) | 2019-12-18 |
Family
ID=57796358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP17700338.1A Active EP3402905B1 (de) | 2016-01-12 | 2017-01-12 | Lederhydrophobierungsverfahren und damit hergestelltes leder |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US10947605B2 (de) |
| EP (1) | EP3402905B1 (de) |
| CN (1) | CN108779503B (de) |
| DE (1) | DE102016000243A1 (de) |
| DK (1) | DK3402905T3 (de) |
| PL (1) | PL3402905T3 (de) |
| WO (1) | WO2017121789A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102019109425B4 (de) | 2019-04-10 | 2022-01-05 | Uvex Safety Gloves Gmbh & Co. Kg | Verfahren zur Herstellung eines imprägnierten Polymersubstrats, Verfahren zur Herstellung von Chemikalienschutzhandschuhen und Verwendung eines imprägnierten Polymersubstrats für Schutzkleidung |
| IT201900017942A1 (it) * | 2019-10-04 | 2021-04-04 | Leather Plus S R L | Metodo di trattamento funzionalizzante per pelli e simili. |
| CN113061670B (zh) * | 2021-03-31 | 2022-05-03 | 四川大学 | 含皮胶原纤维的物质的超疏水改性方法及无鞣剂制革的方法和革制品 |
Family Cites Families (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3507241A1 (de) | 1985-03-01 | 1986-09-04 | Henkel KGaA, 4000 Düsseldorf | Verfahren zur herstellung wasserdichter leder oder pelze |
| DE3529869A1 (de) | 1985-08-21 | 1987-02-26 | Basf Ag | Verfahren zum hydrophobieren von leder und pelzen |
| DE3820829A1 (de) | 1988-05-18 | 1989-12-07 | Priesemuth W | Elektrische innenraumleuchte fuer kraftfahrzeuge |
| DE4202320A1 (de) * | 1992-01-29 | 1993-08-05 | Dierk Dr Knittel | Verfahren zum impraegnieren von substraten |
| FR2696477B1 (fr) * | 1992-10-02 | 1994-11-18 | Commissariat Energie Atomique | Procédé de traitement de peaux, de cuirs ou de matériaux en feuilles contenant du collagène, par un fluide dense sous pression. |
| DE4404890A1 (de) * | 1994-02-16 | 1995-08-17 | Basf Ag | Verfahren zum Hydrophobieren von Leder und Pelzfellen mit kammartig carboxylfunktionalisierten Polysiloxanen |
| DE19507572A1 (de) * | 1995-03-03 | 1996-09-12 | Helmut Geihsler | Verfahren zur Zurichtung von tierischen Häuten oder Fellen |
| US20050214464A1 (en) * | 2002-05-02 | 2005-09-29 | Takashi Moriyoshi | Material such as hide, skin, leather or fur for use in manufacturing leather product, leather product, method for preparing said material, and method for manufacturing leather product |
| DE10250111A1 (de) | 2002-10-28 | 2004-05-06 | Bayer Ag | Chromfreies, wasserdichtes Leder |
| DE10306748A1 (de) | 2003-02-17 | 2004-08-26 | Basf Ag | Verfahren zur Hydrophobierung von Leder und Pelzfellen |
| DE102005012329A1 (de) * | 2005-03-17 | 2006-09-28 | Lanxess Deutschland Gmbh | Verfahren zur Hydrophobierung von Leder mittels Alkylalkoxysilanen sowie hydrophobiertes Leder |
| DE102006008190A1 (de) * | 2006-02-22 | 2007-08-23 | Linde Ag | Verfahren zum Fetten von Leder |
| DE102006027400A1 (de) | 2006-06-13 | 2007-12-20 | Wacker Chemie Ag | Verfahren zur Behandlung von proteinhaltigen, faserartigen Stoffen mit beta-Ketocarbonyl-funktionellen Siloxanpolymeren |
| AU2010327152A1 (en) | 2009-12-03 | 2012-06-28 | Vkr Holding A/S | Method for increasing the water resistance of a porous material, compositions therefore and porous materials treated according to the method |
| CN102718413B (zh) * | 2012-06-29 | 2014-12-24 | 奇瑞汽车股份有限公司 | 疏水剂及其制备方法、疏水玻璃及其制备方法 |
| CN104846134A (zh) * | 2015-05-28 | 2015-08-19 | 青岛启源振东电气有限公司 | 一种稳定的皮革加脂剂 |
-
2016
- 2016-01-12 DE DE102016000243.3A patent/DE102016000243A1/de not_active Ceased
-
2017
- 2017-01-12 US US16/069,390 patent/US10947605B2/en active Active
- 2017-01-12 CN CN201780006602.XA patent/CN108779503B/zh not_active Expired - Fee Related
- 2017-01-12 WO PCT/EP2017/050548 patent/WO2017121789A1/de not_active Ceased
- 2017-01-12 DK DK17700338.1T patent/DK3402905T3/da active
- 2017-01-12 PL PL17700338T patent/PL3402905T3/pl unknown
- 2017-01-12 EP EP17700338.1A patent/EP3402905B1/de active Active
Also Published As
| Publication number | Publication date |
|---|---|
| PL3402905T3 (pl) | 2020-06-15 |
| CN108779503A (zh) | 2018-11-09 |
| DK3402905T3 (da) | 2020-03-16 |
| DE102016000243A1 (de) | 2017-07-13 |
| US20190017129A1 (en) | 2019-01-17 |
| US10947605B2 (en) | 2021-03-16 |
| WO2017121789A1 (de) | 2017-07-20 |
| CN108779503B (zh) | 2021-11-02 |
| EP3402905B1 (de) | 2019-12-18 |
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