EP0179379B1 - Procédé pour projeter électrostatiquement des particules inorganiques - Google Patents

Procédé pour projeter électrostatiquement des particules inorganiques Download PDF

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Publication number
EP0179379B1
EP0179379B1 EP85112988A EP85112988A EP0179379B1 EP 0179379 B1 EP0179379 B1 EP 0179379B1 EP 85112988 A EP85112988 A EP 85112988A EP 85112988 A EP85112988 A EP 85112988A EP 0179379 B1 EP0179379 B1 EP 0179379B1
Authority
EP
European Patent Office
Prior art keywords
powder
frit
ground
agglomerates
added
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
EP85112988A
Other languages
German (de)
English (en)
Other versions
EP0179379A3 (en
EP0179379A2 (fr
Inventor
Hans-Joachim Dr. Schittenhelm
Werner Dr. Joseph
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
Priority to AT85112988T priority Critical patent/ATE54955T1/de
Publication of EP0179379A2 publication Critical patent/EP0179379A2/fr
Publication of EP0179379A3 publication Critical patent/EP0179379A3/de
Application granted granted Critical
Publication of EP0179379B1 publication Critical patent/EP0179379B1/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
    • B05D1/06—Applying particulate materials
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23D—ENAMELLING OF, OR APPLYING A VITREOUS LAYER TO, METALS
    • C23D5/00—Coating with enamels or vitreous layers
    • C23D5/04—Coating with enamels or vitreous layers by dry methods
    • 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
    • B05D2202/00—Metallic substrate

Definitions

  • the present invention relates to the electrostatic application of powder mixtures of physically different systems, in particular the electrostatic powder application of enamel powder and color body mixtures.
  • the present invention therefore relates to a process for the electrostatic spraying of mixtures of different inorganic powders with high surface resistance, in particular enamel powders and colored bodies, onto metallic substrates by forming uniform agglomerates from the powder particles which differ in terms of density, particle size and electrical resistance before the electrostatic spraying, which is characterized in that the agglomerates are formed by adding unsaturated organic compounds in amounts of about 0.1-0.5% by weight, based on frit content, to the agglomerate formation and grinding together before and during the grinding, and the uniform ones Agglomerates are sprayed.
  • the addition of the agglomerating agent does not simultaneously lead to a deterioration in the powder properties, such as a reduction in the electrical powder resistance or a reduction in the fluidity of the powder mixture.
  • enamel frit and colored body powder e.g. according to German Patent 2,015,072
  • organosilicon compounds in such a way that they have an electrical resistance suitable for electrostatic powder application.
  • the agglomeration-promoting substances can be added before, during or after the grinding process. In the latter case, the mixture is subjected to a brief agitation for better distribution and formation of suitable agglomerates.
  • enamel frit and color bodies are used in grinding devices, e.g. in ball mills, with the addition of organosilicon compounds and agglomerating agents to the required fineness.
  • the Si-organic compounds are in amounts of 0.1-1.0% by weight, based on the frit content, preferably 0.2-0.4% by weight, the agglomerating agents in amounts of about 0.1-0 , 5 wt .-% added.
  • Screen printing oils are particularly suitable as agglomeration agents, e.g. Pine oil or unsaturated fatty acids such as Linseed oil or castor oil.
  • polyphenols e.g. Tannin can be used for the purpose according to the invention.
  • agglomerates consisting of frit particles and colored bodies can easily be demonstrated by the fact that after sieving the ground powder on a sieve with a mesh size of 40 l , a homogeneously colored residue remains, which consists of colorless frit particles to which colored bodies are attached are. If the agglomerate formation according to the invention does not take place, frit particles are separated from the finely dispersed color body particles by the sieve test described, the coarser colorless frit particles remain on the sieve.
  • the color powder agglomerates obtained in this way are characterized by high electrical resistance and good fluidity.
  • the powder produced in this way is sprayed onto metallic substrates, there is no separation of the frit and colored body particles.
  • this can be demonstrated by the fact that a steel sheet coated with powder electrostatically has the same color (color location and brightness) after baking as a sample coated with recuperated powder in the same way.
  • the powder mixture obtained in this way was sprayed onto a 10 ⁇ 10 cm, degreased and pickled steel sheet in a customary manner using a commercially available electrostatic gun applying 80 KV voltage to the corona electrode. After the application of 4-5 g powder / dm 2 , the powder electrostatically coated sample plate was baked at 820 ° C. for 3.5 minutes and then measured by colorimetry.
  • Example 1 As described in Example 1, 950 g of commercially available transparent enamel frit, 50 g of rutile colored bodies, 4 g of siloxane according to Example 1 and 1 g of castor oil were again introduced into the same ball mill and ground until the grain distribution maximum of the powder mixture was below 40 ⁇ m and less than 20% Residue remained on the sieve.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Glass Compositions (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Claims (7)

1. Procédé de pulvérisation électrostatique de mélanges de poudres inorganiques différentes, de grande résistance superficielle, notamment de poudres d'émail et de corps colorés, sur des substrats métalliques par formation d'agglomérats homogènes de particules de poudre présentant des différences de masse volumique, de diamètre des particules et de résistance électrique, avant la pulvérisation électrostatique, caractérisé en ce que les agglomérats sont formés par addition aux mélanges en poudre, avant ou pendant le broyage, de composés organiques non saturés en quantités d'environ 0,1 à 0,5% en poids par rapport à la fraction de fritte pour la formation des agglomérats et en broyant l'ensemble, et ces agglomérats homogènes sont pulvérisés.
2. Procédé suivant la revendication 1, caractérisé en ce qu'on ajoute aux mélanges fritte d'émail/corps colorés avant ou pendant le broyage, des composés organiques de silicium qui réagissent avec les groupes Si-OH des poudres inorganiques, et on broie l'ensemble.
3. Procédé suivant la revendication 2, caractérisé en ce que les composés organiques de silicium sont présents en quantités de 0,1 à 1,0% en poids par rapport à la fraction de fritte.
4. Procédé suivant la revendication 1, caractérisé en ce que les composés organiques non saturés contiennent des groupes hydroxyle.
5. Procédé suivant la revendication 2, caractérisé en ce qu'on ajoute comme composés organiques de silicium un méthyl-H-polysiloxane et on broie l'ensemble.
6. Procédé suivant la revendication 1, caractérisé en ce qu'on ajoute comme substances favorisant l'agglomération, de l'huile de pin et de l'huile de ricin, et on broie l'ensemble.
7. Procédé suivant la revendication 1, caractérisé en ce qu'on ajoute du tannin comme substance favorisant l'agglomération et on broie l'ensemble.
EP85112988A 1984-10-25 1985-10-14 Procédé pour projeter électrostatiquement des particules inorganiques Expired - Lifetime EP0179379B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85112988T ATE54955T1 (de) 1984-10-25 1985-10-14 Verfahren zum elektrostatischen verspruehen anorganischer pulver.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19843439007 DE3439007A1 (de) 1984-10-25 1984-10-25 Verfahren zum elektrostatischen verspruehen anorganischer pulver
DE3439007 1984-10-25

Publications (3)

Publication Number Publication Date
EP0179379A2 EP0179379A2 (fr) 1986-04-30
EP0179379A3 EP0179379A3 (en) 1988-05-04
EP0179379B1 true EP0179379B1 (fr) 1990-07-25

Family

ID=6248692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85112988A Expired - Lifetime EP0179379B1 (fr) 1984-10-25 1985-10-14 Procédé pour projeter électrostatiquement des particules inorganiques

Country Status (5)

Country Link
US (1) US4659586A (fr)
EP (1) EP0179379B1 (fr)
AT (1) ATE54955T1 (fr)
DE (2) DE3439007A1 (fr)
ES (1) ES8605398A1 (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3700702C1 (de) * 1987-01-13 1988-02-11 Bayer Ag Mit Organopolysiloxanen beschichtete Emailpulver fuer den elektrostatischen Pulverauftrag und Verfahren zu ihrer Herstellung
IT1255048B (it) * 1992-03-31 1995-10-17 Peter Thometzek Polveri ceramiche per la loro applicazione elettrostatica e procedimento per la loro preparazione
IT1254974B (it) * 1992-06-18 1995-10-11 Bayer Italia Spa Granulati compositi, scorrevoli,idrofobi,un procedimento per la loro preparazione nonche' loro impiego
IT1256263B (it) * 1992-12-30 1995-11-29 Bayer Italia Spa Granulati di coloranti scorrevoli,chimicamente resistenti,loro preparazione e loro impiego
EP0658523B1 (fr) * 1993-12-14 1998-03-25 FERRO (ITALIA) s.r.l. Granulés hydrophobes fluides, un procédé pour leur production et leur utilisation
US6324298B1 (en) * 1998-07-15 2001-11-27 August Technology Corp. Automated wafer defect inspection system and a process of performing such inspection
FR2830857B1 (fr) * 2001-10-15 2004-07-30 Pechiney Aluminium Precurseur de revetement et procede pour revetir un substrat d'une couche refractaire
AU2002358833B9 (en) * 2001-10-15 2008-05-22 Aluminum Pechiney Coating precursor and method for coating a substrate with a refractory layer
US8030252B2 (en) * 2004-03-12 2011-10-04 Halliburton Energy Services Inc. Polymer-based, surfactant-free, emulsions and methods of use thereof

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3443973A (en) * 1964-11-24 1969-05-13 Du Pont Composite vitreous enamels and their preparation
US3400000A (en) * 1965-05-17 1968-09-03 Du Pont Surface modified electrostatic enamel powders and method
US3928668A (en) * 1974-05-06 1975-12-23 Ferro Corp Electrostatic deposition of dry ceramic powders

Also Published As

Publication number Publication date
DE3578861D1 (de) 1990-08-30
ATE54955T1 (de) 1990-08-15
ES548178A0 (es) 1986-03-16
EP0179379A3 (en) 1988-05-04
ES8605398A1 (es) 1986-03-16
EP0179379A2 (fr) 1986-04-30
US4659586A (en) 1987-04-21
DE3439007A1 (de) 1986-04-30

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