EP0362602B1 - Procédé pour apprêtu du cuir - Google Patents

Procédé pour apprêtu du cuir Download PDF

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Publication number
EP0362602B1
EP0362602B1 EP89117171A EP89117171A EP0362602B1 EP 0362602 B1 EP0362602 B1 EP 0362602B1 EP 89117171 A EP89117171 A EP 89117171A EP 89117171 A EP89117171 A EP 89117171A EP 0362602 B1 EP0362602 B1 EP 0362602B1
Authority
EP
European Patent Office
Prior art keywords
spray
finishing
process according
liquors
leather
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.)
Expired - Lifetime
Application number
EP89117171A
Other languages
German (de)
English (en)
Other versions
EP0362602A3 (fr
EP0362602A2 (fr
Inventor
Harro Dr. Träubel
Heinrich Strenger
Karl-Arnold Dr. Weber
Hans-Werner Müller
Horst Zäpfel
Axel Hummel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bayer AG
Original Assignee
Bayer AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Bayer AG filed Critical Bayer AG
Publication of EP0362602A2 publication Critical patent/EP0362602A2/fr
Publication of EP0362602A3 publication Critical patent/EP0362602A3/fr
Application granted granted Critical
Publication of EP0362602B1 publication Critical patent/EP0362602B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B05D1/04—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field
    • B05D1/045—Processes for applying liquids or other fluent materials performed by spraying involving the use of an electrostatic field on non-conductive substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B16/00—Spray booths
    • B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
    • B05B16/95—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth the objects or other work to be sprayed lying on, or being held above the conveying means, i.e. not hanging from the conveying means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
    • B05B5/08—Plant for applying liquids or other fluent materials to objects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/04—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to gases
    • B05D3/0486—Operating the coating or treatment in a controlled atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/12—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to leather

Definitions

  • the invention relates to a method for finishing leather by spray application of optionally water-containing organic solutions in the electrostatic field and a device for carrying out the method.
  • this method also has a number of serious disadvantages.
  • the high spray losses of material to be applied should be mentioned first and foremost.
  • it requires the use of highly diluted solutions (i.e. with only about 2-4% solids content), which makes recovery of the solvents from the exhaust air in an economically reasonable range almost impossible.
  • This new process solves two important problems to date: It enables the use of highly concentrated spray liquids and the processing of the solvent-containing exhaust air in an economically justifiable way.
  • the solids content of the dressing liquors can be up to 50% and the viscosity at working temperature up to 10,000 cP. It is preferred to work with liquors which have a viscosity of 500-5,000 cP at working temperature. In general, the working temperature is 20-40 ° C (about room temperature). With highly viscous polymer-containing liquors, the temperature can also be increased to 60-80 ° C to reduce the viscosity.
  • the residual oxygen in the solvent atmosphere is preferably less than 10, particularly preferably less than 7% by volume.
  • the atmospheric oxygen content is reduced to these values by supplying inert gases, such as. B. nitrogen, argon, CO2 or, if necessary, water vapor.
  • inert gases such as. B. nitrogen, argon, CO2 or, if necessary, water vapor.
  • the solvent content in the solvent atmosphere should be 10-100%, preferably 15-90% and particularly preferably 25-75% of the saturation concentration. If the solvent concentration is too close to saturation, condensation and undesirable droplet formation can occasionally occur.
  • the same substances that are used to produce the spray solution are preferably used as solvents for generating this atmosphere.
  • All solvents used in the finishing of leather can be used as solvents, such as. B. esters, ketones, ethers, ether alcohols, alcohols, ether esters and aromatic hydrocarbons.
  • the finishing liquors can contain conventional leather auxiliaries, such as. B. Crosslinking agents, waxes, dyes, fillers, matting agents, pigments, handles, viscosity regulators, drying agents, etc.
  • all polymers used in leather finishing can be used with the new process, such as cellulose esters (nitrocellulose, cellulose acetobutyrate), polyamides, polyurethanes, polymers and copolymers of vinyl chloride, vinylidene chloride and vinyl acetate etc.
  • cellulose esters nitrocellulose, cellulose acetobutyrate
  • polyamides polyamides
  • polyurethanes polymers and copolymers of vinyl chloride, vinylidene chloride and vinyl acetate etc.
  • finishes for high-quality leather as required in the furniture and automotive upholstery sector, can be produced, with particular emphasis being placed on the fact that the leather pieces can be stacked immediately after the finish, if they are appropriately dried.
  • the spray booth shown in FIG. 1 which essentially has 2 measuring points, oxygen measuring device, inert gas and compressed air supply, spray nozzle for the solvent, ventilation, spray bell, dressing liquor, high-voltage generator, movement device for the workpiece and grounded support table is equipped.
  • the oxygen-containing gas is removed at measuring points (1) and (2) and the oxygen content is determined using an oxygen measuring device (3). Only when the safety value of 15 vol.% Or less O2 has been reached can the preparation be started by switching on the high voltage (10).
  • the dressing is carried out, for example, according to the principle of the electrostatic high-rotation spraying process.
  • electrostatic spray technology a high-voltage field is generated between the spray bell (9) and the grounded workpiece (leather) (11).
  • the liquid to be sprayed is pumped from the dressing liquor (8) into the bell (9) rotating at high speed, where it is atomized.
  • the atomized paint particles become negatively charged at the edge of the bell and are then guided to the earthed workpiece by means of the electrostatic field forces and deposited there, releasing their charge.
  • the grounded support table (13) transfers its grounding to the workpiece. It goes without saying it is also possible to apply the solutions with normal spray nozzles, ie an atomization process which is carried out airless or with air.
  • the leather is transported out of the spray area by means of the movement device (12).
  • the atmosphere loaded with solvent can be disposed of through the vent (7), e.g. by freezing or absorbing the solvent, which can be recirculated if necessary. If necessary, the interior of the spray booth can be ventilated with compressed air (5).
  • a solution of product I (see below) is processed at 20 ° C on an electrostatic spraying system, type Ransburg.
  • the electrostatic spraying system is installed in a cabin that is filled with a gas mixture that is changed 15 times an hour in the continuous inflow and outflow and that consists of a mixture of room air / nitrogen in which the oxygen content is below 5 vol. -% lies.
  • the setting of the spray bell was set to Control air 1.2 bar Ring air 3.5 bar Revolutions of the bell 10-35,000 rpm tension 70 KV
  • the solution is sprayed, but there is only an intensive thread formation in the air gap between the bell and the substrate, as it is described in the parlance with "spiders". Changes regarding control air, ring air or revolution have no influence.
  • Example 1b The procedure is as in Example 1a, but with the difference that the spray booth is charged with a gas mixture of nitrogen / diacetone alcohol (DAA), whereby the cabin atmosphere is saturated with DAA (10-11 g / m3 DAA cabin space).
  • DAA nitrogen / diacetone alcohol
  • Example 2b 100 g of the solution from Example 2b were added to 20 g of a 20% solution of cellulose acetoburyrate in acetone / diacetone alcohol (60:40). This solution can also be sprayed well.
  • a PU reactive system is injected, which has a viscosity of approx. 3000 cP at RT and a solids content of 90%.
  • the control air was set to 3 bar; the turbine had a speed of 40,000 rpm.
  • Example 1 of DE-A 2 637 115 In a modification of Example 1 of DE-A 2 637 115, the following experiment was carried out: Two metering pumps, one for prepolymer A (see below) and the other for hardener 1, convey into a mixing chamber, which has a mixer according to EP-A 1581, where it is mixed with the aid of nitrogen and via one with a spray electrode provided spray gun on a reversely charged (grounded) die glued to an aluminum plate. Due to the solvent in the spray booth atmosphere, the flow of the sprayed material on the die is excellent. The mass sprayed onto the matrix runs like a film and begins to set after about 1 minute from the time of spraying. The split leather to be coated is placed on the reactive mass and pressed on. The entire coating then passes through a drying tunnel heated to 80 ° C. After about 6 minutes from the time of spraying, the coating is removed from the die without sticking.
  • a mixing chamber which has a mixer according to EP-A 1581, where it is mixed with the aid of nitrogen and
  • the polyurethane urea layer has a thickness of 0.22-0.25 mm.
  • the coated split leather has a deceptively similar grain to natural leather, is dry after a short time, stackable and can be processed on common shoe machines.
  • the adhesion between the coating and split leather is excellent, the handle pleasantly dry.
  • a prepolymer was produced using isophorone diisocyanate, which was extended to the polyurethane urea with hydrazine hydrate.
  • the polyurethane is a 40% solution in toluene / isopropanol / methoxypropanol-2 (3: 3: 1).
  • the solution has a viscosity that cannot be measured in a DIN cup (4 mm; DIN 53211) (in the Haake viscometer it had more than 20,000 cP at 22 ° C). It was also not sprayable.
  • thermoplastic polyester-polyurethane as a 30% solution in toluene / isopropanol (1: 1) consisting of an adipic acid-hexanediol polyester with an average molecular weight of 2,000 reacted with isophorone diisocyanate in a NCO: OH molar ratio of 1: 1.
  • the prepolymer solution has a viscosity of 1,000 cP at 20 ° C.
  • IPDA 3,3,5-trimethyl-5-aminomethyl-cyclohexylamine

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Treatment And Processing Of Natural Fur Or Leather (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)

Claims (5)

  1. Procédé pour l'apprêtage de cuir par application par pulvérisation de bains d'apprêtage contenant des solvants organiques renfermant éventuellement de l'eau dans un champ électrostatique, caractérisé en ce qu'on pulvérise les bains d'apprêtage dès le départ dans une atmosphère dissolvante contenant des solvants organiques renfermant éventuellement de l'eau, cette atmosphère présentant une teneur résiduelle en oxygène de 15 % en volume au maximum.
  2. Procédé suivant la revendication 1, caractérisé en ce que la teneur résiduelle en oxygène est inférieure à 10 % en volume, de préférence inférieure à 7 % en volume.
  3. Procédé suivant la revendication 1, caractérisé en ce que la viscosité des bains à la température de travail s'élève à 500-5000 cP.
  4. Procédé suivant la revendication 1, caractérisé en ce que la pulvérisation est effectuée en présence d'un gaz inerte.
  5. Dispositif pour la mise en oeuvre du procédé suivant la revendication 1, caractérisé en ce qu'il est essentiellement constitué d'une cabine de pulvérisation convenant pour la mise en oeuvre de l'opération de pulvérisation électrostatique par le procédé à grande vitesse de rotation, par le procédé airless ou par atomisation pneumatique (avec utilisation d'un gaz inerte à la place d'air), la cabine étant équipée d'un appareil de mesure de l'oxygène, d'une arrivée de gaz inerte et d'une arrivée d'air comprimé, d'une cloche de pulvérisation en liaison avec un bain d'apprêtage, d'un générateur de haute tension, d'une évacuation d'air, d'un dispositif de mouvement de la pièce et d'une table de support mise à la terre.
EP89117171A 1988-10-01 1989-09-16 Procédé pour apprêtu du cuir Expired - Lifetime EP0362602B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3833384 1988-10-01
DE3833384A DE3833384A1 (de) 1988-10-01 1988-10-01 Verfahren zum zurichten von leder

Publications (3)

Publication Number Publication Date
EP0362602A2 EP0362602A2 (fr) 1990-04-11
EP0362602A3 EP0362602A3 (fr) 1991-07-17
EP0362602B1 true EP0362602B1 (fr) 1993-05-19

Family

ID=6364148

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89117171A Expired - Lifetime EP0362602B1 (fr) 1988-10-01 1989-09-16 Procédé pour apprêtu du cuir

Country Status (5)

Country Link
US (1) US5009921A (fr)
EP (1) EP0362602B1 (fr)
JP (1) JPH02139057A (fr)
DE (1) DE3833384A1 (fr)
ES (1) ES2054966T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106216154A (zh) * 2016-08-26 2016-12-14 无锡市新达轻工机械有限公司 一种具有烘干功能的皮革喷涂装置
CN112170075A (zh) * 2020-09-10 2021-01-05 祁东县美能包装有限公司 一种复合纸板生产用的环保型喷胶烘干装置

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5350603A (en) * 1992-05-15 1994-09-27 Owens-Corning Fiberglas Technology Inc. Method for painting window lineal members
US5893950A (en) * 1997-07-31 1999-04-13 The Dexter Corporation Method and apparatus for applying a water-based coating composition to a substrate
US6506456B1 (en) * 1999-10-29 2003-01-14 Kimberly-Clark Worldwide, Inc. Method for application of a fluid on a substrate formed as a film or web
DE102007013637B4 (de) 2007-03-19 2018-12-20 Ewald Dörken Ag Verfahren zum Beschichten von metallischen Werkstücken
CN102151625A (zh) * 2011-04-15 2011-08-17 肇庆市宝利达机电设备有限公司 皮革静电喷涂机

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR613502A (fr) * 1925-08-03 1926-11-19 Perfectionnements au vernissage des cuirs et autres matières
US2634216A (en) * 1948-08-25 1953-04-07 United Shoe Machinery Corp Method for forming removable protective coverings
DE3106605C2 (de) * 1981-02-23 1983-02-03 Basf Farben + Fasern Ag, 2000 Hamburg Spritzlackierverfahren und Anordnung zur Durchführung desselben
JPS58136063A (ja) 1982-02-08 1983-08-12 Fuji Xerox Co Ltd 電子写真複写機のコロナ放電装置
DE3611729A1 (de) * 1986-04-08 1987-10-15 Ransburg Gmbh Fluessigkeitssprueheinrichtung zum bespruehen von leder

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106216154A (zh) * 2016-08-26 2016-12-14 无锡市新达轻工机械有限公司 一种具有烘干功能的皮革喷涂装置
CN112170075A (zh) * 2020-09-10 2021-01-05 祁东县美能包装有限公司 一种复合纸板生产用的环保型喷胶烘干装置

Also Published As

Publication number Publication date
EP0362602A3 (fr) 1991-07-17
EP0362602A2 (fr) 1990-04-11
US5009921A (en) 1991-04-23
ES2054966T3 (es) 1994-08-16
DE3833384A1 (de) 1990-04-12
JPH02139057A (ja) 1990-05-29

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