WO1998038341A1 - Zusammensetzung zur behandlung von gegerbtem leder, sowie ihre herstellung - Google Patents
Zusammensetzung zur behandlung von gegerbtem leder, sowie ihre herstellung Download PDFInfo
- Publication number
- WO1998038341A1 WO1998038341A1 PCT/EP1998/001025 EP9801025W WO9838341A1 WO 1998038341 A1 WO1998038341 A1 WO 1998038341A1 EP 9801025 W EP9801025 W EP 9801025W WO 9838341 A1 WO9838341 A1 WO 9838341A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- composition according
- acid
- leather
- aromatic
- weight
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C303/00—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides
- C07C303/02—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof
- C07C303/04—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof by substitution of hydrogen atoms by sulfo or halosulfonyl groups
- C07C303/06—Preparation of esters or amides of sulfuric acids; Preparation of sulfonic acids or of their esters, halides, anhydrides or amides of sulfonic acids or halides thereof by substitution of hydrogen atoms by sulfo or halosulfonyl groups by reaction with sulfuric acid or sulfur trioxide
-
- 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
- C14C3/08—Chemical tanning by organic agents
- C14C3/18—Chemical tanning by organic agents using polycondensation products or precursors thereof
- C14C3/20—Chemical tanning by organic agents using polycondensation products or precursors thereof sulfonated
Definitions
- composition for the treatment of tanned leather and its manufacture Composition for the treatment of tanned leather and its manufacture
- the invention relates to a composition
- a composition comprising (A) one or more aromatic sulfonates, (B) one or more aldehyde resins and (C) a buffer, the preparation of this composition and the use for the treatment, in particular for the neutralization of with mineral or mineral-free Tanned leather compounds.
- tannins For the production of leather and furs, animal skins are tanned with tannins, which transform the skins into resistant leather or furs.
- the tannins which essentially crosslink the skin's collagen fibers, can be divided into inorganic or mineral and organic-chemical tannins.
- the organic chemical tanning agents can also be of synthetic or vegetable origin.
- the mineral and especially the so-called chrome tanning has an outstanding position for the production of leather and fur.
- 90% of all leather is chrome-tanned.
- chrome tanning the skin absorbs chromium (III) salts, which crosslink the collagen fibers due to the formation of a complex with the carboxy groups of the collagen.
- the intermediate products of chrome tanning that are produced come on the market as semi-finished products, so-called "wet blues", and are ideally suited to be processed into a wide variety of leather articles. This usually requires a so-called retanning in which the actual leather character is determined.
- the retanning is usually carried out with anionic substances from the class of synthetic or vegetable tanning agents, such as. B. also resin tanning agents, lignin sulfonates, polymeric tanning agents, aldehydes, paraffin sulfochlorides, polyphosphates or inert fillers.
- Anionic greasing agents are also used in retanning to produce supple and water-repellent leather, and anionic dyes are used to produce colored leather.
- a fundamental problem in retanning, for example, chrome leather with anionic substances is that the cationic character of the tanned leather allows the anionic substances to react very quickly and, as a result, the substances cannot penetrate into the leather or cannot penetrate deep enough. This generally leads to a superficial and uneven deposition of the substances on the leather and an overload of the grain. The consequences can be unsightly scars, loose scars, deteriorated leather properties and scar brittleness. It is even possible for the substances to precipitate on the leather surface.
- neutralization or deacidification is carried out before retanning tanned leather, which is intended to weaken or reduce the cationic character of the leather, but which can also interfere with the chemistry of the tanning process.
- the intensity of neutralization should therefore not be too scarce or too strong. Inadequate neutralization only insufficiently solves the above-mentioned problems and can, for example, also cause poor storage stability of the Be leather. Over-neutralization, on the other hand, is often the cause of the loose grain of the leather.
- Over-neutralization is easily achieved with strong neutralizing agents such as B. Soda, sodium bicarbonate or borax, which are therefore often used today in combination with mild-acting agents.
- mild neutralizers such as. B. sodium and calcium formate, sodium acetate, sodium sulfite, sodium thiosulfate or sodium polyphosphate
- over-neutralization is generally excluded.
- the disadvantage of these agents is that the pH value desired for certain types of leather cannot be achieved.
- salts of organic and inorganic acids with a buffer effect such as. B. formates, acetates, oxalates, adipinates, glutarates, citrates, lactates, carbonates, bicarbonates, polycarbonates, oxicarbonates, silicates, borates or phosphates, since the pH range desired for certain types of leather can be controlled more precisely.
- tannic sulfonic acids are also frequently used in combination with salts of acids with a buffer effect.
- tanninsulfonic acids interact with, for example, the chromium complexes, displacing sulfato groups and releasing sulfuric acid.
- the released sulfuric acid is neutralized by the buffer.
- the disadvantage of such agents is that the leathers are bleached to a greater extent and therefore, if the leather is to be dyed, more dye is required. In addition, the colors are less brilliant.
- the leathers also tend to become softer and less pitted, which is particularly disadvantageous for the shoe upper leather sector.
- the object of the present invention is therefore to find a composition and / or a method in which the disadvantages described above can be prevented or at least reduced.
- the invention therefore relates to a composition
- a composition comprising (A) one or more aromatic sulfonates; (B) one or more aldehyde resins; and (C) one or more buffers.
- the aromatic sulfonate according to (A) is generally selected from a sulfonated benzene and its derivatives, in particular toluene, phenol, cresol, resorcinol; sulfonated polycyclic aromatic compounds and their derivatives, in particular naphthalene, naphthol, (hydroxy) diarylsulfone, (hydroxy) diaryl ether, where aryl is preferably phenyl; sulfonated oligophenyls or their derivatives, preferably diphenyl or terphenyl; or mixtures thereof; Naphthalene, toluene and xylene are particularly suitable as starting materials.
- the aromatic sulfonate according to (A) is a condensation product of one or more aromatic sulfonates and an aliphatic aldehyde, preferably formaldehyde and / or acetaldehyde, in particular formaldehyde, or a condensation product one or more aromatic sulfonates and a condensation product of one or more amides of carbonic acid and an aliphatic aldehyde, preferably formaldehyde and / or acetaldehyde, especially formaldehyde.
- Particularly suitable amides of carbonic acid are urea and / or urea derivatives, such as. B.
- a urea-formaldehyde condensation product a melamine-formaldehyde condensation product and / or a melamine-urea-formaldehyde condensation product, especially a urea-formaldehyde condensation product.
- the sulfonated aromatic compound which can be single or multiple sulfonated, is advantageously produced from one molar equivalent of an aromatic compound and 1-5, preferably 2-4, in particular approximately 3-4, molar equivalents of SO 3 .
- the aromatic sulfonate is preferably a mixture of single and multiple, in particular a mixture of different, especially double to triple sulfonated compounds.
- Concentrated sulfuric acid for example 95-98% strength sulfuric acid, or fuming sulfuric acid, for example oleum 24% (2 mol of SO 3 ), is preferably used as SO 3 source.
- the reaction with concentrated or fuming sulfuric acid is preferably carried out at about 100-160 ° C, in particular at about 130-150 ° C for about 1-4, preferably about 2 hours.
- the sulfonation products are generally multiply sulfonated, and depending on the molecular ratio of aromatic compound and SO 3 , up to 50% by weight of free sulfate can additionally be present in the end product.
- the product is generally adjusted to a pH of about 6-10, preferably with sodium hydroxide solution.
- condensation products from a sulfonated aromatic compound and formaldehyde or formaldehyde-urea condensate are generally known and described in more detail, for example, in DE 28 43 233 using the example of a ⁇ -naphtholsulfonic acid-formaldehyde or a naphthalenesulfonic acid-formaldehyde condensation product or in DE 21 13 096 using the example of a naphthalenesulfonic acid-formaldehyde-urea condensation product.
- the aldehyde resin according to (B) is reacted with one or more nitrogen-containing compounds by condensation of one or more aliphatic aldehydes, preferably formaldehyde and / or acetaldehyde, in particular formaldehyde, in particular the aldehyde resin is reacted by simultaneous or subsequent condensation of one or more several aliphatic aldehydes with one or more nitrogen-containing compounds and one or more salts of sulfurous acid, especially with sodium bisulfite.
- the nitrogen-containing compound is advantageously urea, melamine, dicyanamide and / or guanidine, preferably urea.
- a nitrogen-containing compound preferably urea
- an aliphatic aldehyde preferably formaldehyde
- the condensation product then preferably with about 1-3 molar equivalents of one or more salts of sulfurous acid, preferably sodium bisulfite, at a pH of about 7-10 and at about 90-105 ° C. Implemented for 2-4 hours.
- the production of a condensation product from melamine, urea, formaldehyde and hydrogen sulfite is described in more detail, for example, in EP 0 063 319.
- the buffer (s) according to (C) contains one or more salts of one or more
- Acids with a buffer effect preferably in a pH range of approx. 3-7, in particular approx. 3-5.
- the selection of the appropriate buffer for the Corresponding leather can easily be determined, for example, using titration curves and is also described, for example, in the Library of Leather, Volume 3, pages 211-223 (ed. H. Herfeld, Umschau-Verlag / Frankfurt, 1985).
- the acid mentioned is an organic acid, especially an organic mono- and / or dicarboxylic acid.
- the salt of the organic acid is preferably a formate, acetate, carbonate, oxicarbonate, bicarbonate, polycarbonate, citrate, glutamate, lactate, adipinate, glutarate, succinate, oxalate, malonate, tartrate, phthalate, fumarate, maleate, with the sodium salts being particularly preferred are.
- a mixture of succinate, glutarate and adipinate with a content of preferably approximately 20-30% by weight succinate, approximately 40-50% by weight glutarate and approximately 20-30% by weight adipinate and, if appropriate, additionally about 10-80% by weight of formate is preferred.
- the acid mentioned is an inorganic acid, in particular sulfurous acid, phosphoric acid, silica, boric acid and / or nitrous acid.
- composition according to the invention are in particular distributed as follows: Component (A): approx. 5-80% by weight, preferably approx. 20-60% by weight , especially about 30-50% by weight; Component (B): about 5-80% by weight, preferably about 10-40% by weight, especially about 15-25% by weight. %; Component (C): about 10-80% by weight, preferably about 20-60% by weight, especially about 30-40% by weight.
- composition according to the invention is produced by simply mixing components (A), (B) and (C) and / or by producing the individual components in a so-called one-pot reaction.
- Another object of the present invention is therefore a method for producing the composition according to the invention by mixing of components (A), (B) and (C) and / or preparation of components (A), (B) and / or (C) in a one-pot reaction, preferably with the proportions described above and according to those described above Method.
- composition according to the invention is advantageously suitable for the treatment of tanned leather.
- Another object of the present invention therefore relates to a method or the use of the composition according to the invention for the treatment of tanned leather, in particular for the neutralization of tanned leather, especially for the treatment or neutralization of leather tanned with mineral compounds.
- the composition according to the invention is preferably suitable for the treatment of leather tanned with chromium, aluminum, zirconium, titanium and / or iron salts, in particular with chromium (III) salts, especially with chromium (III) sulfet (" Wetblue "), An application for so-called" Wetwhite leather "is also possible, d.
- H leather pre-tanned with organic chemical tanning agents. In particular, with aldehyde, for. B.
- the present invention now surprisingly makes it possible to improve the brilliance and depth of color of the leather, the bleaching effect of known neutralizing tanning agents described above not being observed or not being observed essentially.
- the leathers generally have a very round, pleasant grip and are outstandingly grained.
- an improved grain size of the leather surface is achieved.
- This temperature is held for 3 hours. It is then cooled to 100 ° C., mixed with 250 g of water and adjusted to pH 9 with NaOH 50%. Then 198 g NaHSO 3 40% (0.75 mol), 150 g formaldehyde 30% (1.5 mol) and 45 g urea (0.75 mol) are added. The reaction mixture is heated to 90 ° C. and held for 4 hours, then cooled to 80 ° C. and mixed with 240 g of the dicarboxylic acid mixture mentioned in Example 1 and in parallel with 250 g of 50% NaOH. 150 g of water and 25.5 g of sodium formate are then added.
- 850 g of a 30% aqueous solution of a commercially available naphthalenesulfonic acid-formaldehyde condensate are heated to 50 ° C. and mixed with 265 g of the dicarboxylic acid mixture mentioned in Example 1. The mixture is adjusted to pH 7 with about 280 g of 50% NaOH.
- Comparative Example A gives very uneven, cloudy colorations and very hard, rickety leather.
- Comparative example B produces very lightened leather which is significantly looser than the leather which was treated with the products according to examples 1-3.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
- Phenolic Resins Or Amino Resins (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP53728698A JP2001513831A (ja) | 1997-02-26 | 1998-02-23 | なめし革の処理のための組成物ならびにその製造 |
DE59808160T DE59808160D1 (de) | 1997-02-26 | 1998-02-23 | Zusammensetzung zur behandlung von gegerbtem leder, sowie ihre herstellung |
US09/367,843 US6316533B1 (en) | 1997-02-26 | 1998-02-23 | Composition for treating tanned leather, and its preparation |
EP98912372A EP0963446B1 (de) | 1997-02-26 | 1998-02-23 | Zusammensetzung zur behandlung von gegerbtem leder, sowie ihre herstellung |
AU67238/98A AU6723898A (en) | 1997-02-26 | 1998-02-23 | Composition for treating tanned leather, and its preparation |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19707713A DE19707713A1 (de) | 1997-02-26 | 1997-02-26 | Zusammensetzung zur Behandlung von gegerbtem Leder, sowie ihre Herstellung |
DE19707713.7 | 1997-02-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998038341A1 true WO1998038341A1 (de) | 1998-09-03 |
Family
ID=7821562
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1998/001025 WO1998038341A1 (de) | 1997-02-26 | 1998-02-23 | Zusammensetzung zur behandlung von gegerbtem leder, sowie ihre herstellung |
Country Status (8)
Country | Link |
---|---|
US (1) | US6316533B1 (de) |
EP (1) | EP0963446B1 (de) |
JP (1) | JP2001513831A (de) |
KR (1) | KR20000071205A (de) |
AU (1) | AU6723898A (de) |
DE (2) | DE19707713A1 (de) |
ES (1) | ES2198703T3 (de) |
WO (1) | WO1998038341A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8481169B2 (en) | 2007-06-28 | 2013-07-09 | Midori Hokuyo Co., Ltd. | Leather |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR20020015712A (ko) * | 2002-01-11 | 2002-02-28 | 주식회사 한울림 | 북가죽 제조방법 |
KR100788492B1 (ko) | 2007-03-05 | 2007-12-24 | 한국신발피혁연구소 | 육면혁을 이용한 자동차 내장재용 천연가죽의 제조방법 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1126888B (de) * | 1960-08-04 | 1962-04-05 | Basf Ag | Verfahren zur Herstellung von Kondensationsprodukten aus sulfonierten ª‰-Naphtholen, Harnstoff, Formaldehyd und Phenolen |
DE1545192A1 (de) * | 1962-09-27 | 1970-03-12 | Diamond Shamrock Corp | Verfahren zur Herstellung wasserloeslicher Kondensationsprodukte |
FR2163108A5 (de) * | 1971-11-26 | 1973-07-20 | Basf Ag | |
FR2270327A1 (de) * | 1974-05-06 | 1975-12-05 | Diamond Shamrock Corp |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AR208085A1 (es) * | 1974-05-18 | 1976-11-30 | Bayer Ag | Procedimiento de curtido al cromo |
US4526581A (en) * | 1983-02-07 | 1985-07-02 | Rohm And Haas Company | Process for producing leather |
DE3517803A1 (de) * | 1985-05-17 | 1986-11-20 | Bayer Ag, 5090 Leverkusen | Verfahren zur fettungsbehandlung von leder und seine verwendung zum direkt-anspritzen von polyurethan zu leder/polyurethan-verbunden |
DE3632587A1 (de) * | 1986-09-25 | 1988-04-07 | Cassella Ag | Verfahren zur gerbung von leder |
-
1997
- 1997-02-26 DE DE19707713A patent/DE19707713A1/de not_active Withdrawn
-
1998
- 1998-02-23 WO PCT/EP1998/001025 patent/WO1998038341A1/de not_active Application Discontinuation
- 1998-02-23 DE DE59808160T patent/DE59808160D1/de not_active Expired - Lifetime
- 1998-02-23 AU AU67238/98A patent/AU6723898A/en not_active Abandoned
- 1998-02-23 JP JP53728698A patent/JP2001513831A/ja active Pending
- 1998-02-23 EP EP98912372A patent/EP0963446B1/de not_active Expired - Lifetime
- 1998-02-23 US US09/367,843 patent/US6316533B1/en not_active Expired - Fee Related
- 1998-02-23 ES ES98912372T patent/ES2198703T3/es not_active Expired - Lifetime
- 1998-02-23 KR KR1019997007495A patent/KR20000071205A/ko not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1126888B (de) * | 1960-08-04 | 1962-04-05 | Basf Ag | Verfahren zur Herstellung von Kondensationsprodukten aus sulfonierten ª‰-Naphtholen, Harnstoff, Formaldehyd und Phenolen |
DE1545192A1 (de) * | 1962-09-27 | 1970-03-12 | Diamond Shamrock Corp | Verfahren zur Herstellung wasserloeslicher Kondensationsprodukte |
FR2163108A5 (de) * | 1971-11-26 | 1973-07-20 | Basf Ag | |
FR2270327A1 (de) * | 1974-05-06 | 1975-12-05 | Diamond Shamrock Corp |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8481169B2 (en) | 2007-06-28 | 2013-07-09 | Midori Hokuyo Co., Ltd. | Leather |
Also Published As
Publication number | Publication date |
---|---|
DE59808160D1 (de) | 2003-06-05 |
JP2001513831A (ja) | 2001-09-04 |
AU6723898A (en) | 1998-09-18 |
KR20000071205A (ko) | 2000-11-25 |
DE19707713A1 (de) | 1998-08-27 |
EP0963446B1 (de) | 2003-05-02 |
ES2198703T3 (es) | 2004-02-01 |
US6316533B1 (en) | 2001-11-13 |
EP0963446A1 (de) | 1999-12-15 |
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