WO1984002711A1 - Dispersion aqueuse - Google Patents

Dispersion aqueuse Download PDF

Info

Publication number
WO1984002711A1
WO1984002711A1 PCT/DE1984/000001 DE8400001W WO8402711A1 WO 1984002711 A1 WO1984002711 A1 WO 1984002711A1 DE 8400001 W DE8400001 W DE 8400001W WO 8402711 A1 WO8402711 A1 WO 8402711A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
stabilizing agent
particle size
average particle
fillers
Prior art date
Application number
PCT/DE1984/000001
Other languages
German (de)
English (en)
Inventor
Peter Lessmeister
Bernhard Dors
Original Assignee
Basf Farben & Fasern
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 Basf Farben & Fasern filed Critical Basf Farben & Fasern
Publication of WO1984002711A1 publication Critical patent/WO1984002711A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/05—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media from solid polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C09D5/024—Emulsion paints including aerosols characterised by the additives
    • C09D5/027—Dispersing agents

Definitions

  • the invention relates to an aqueous dispersion of a powdery binder with an average particle size of 0.5 to 20 microns, which contains a stabilizing agent and optionally pigments, hardeners, fillers and other known auxiliaries.
  • DE-OS 27 16 118 discloses a process for producing a lacquer film by applying an aqueous suspension of a solid synthetic resin or a synthetic resin mixture containing wetting agents and optionally leveling agents.
  • an alkylphenyl oxyethylate is used as wetting agent or stabilizing agent.
  • the use of alkylphenyl oxyethylate or similar wetting agents has the disadvantage that these stabilizing agents degrade the properties of the final paint film. They remain in the lacquer film when the coating is baked on, although they are not a cross-linked component. These stabilizing agents frequently reduce the water resistance, weather resistance and the elasticity of the resulting paint film.
  • the known paint films produced using conventional stabilizers often do not offer satisfactory corrosion protection.
  • the object of the invention is to avoid these disadvantages of the prior art and to provide a method of the type mentioned at the outset in which the stabilizing agent does not adversely affect the paint film.
  • the stabilizing agent should become an integral part of the paint film and contribute to the properties of the same in a positive manner.
  • This object is achieved according to the invention in the case of an aqueous dispersion of the type mentioned at the outset in that it contains a water-soluble or water-dilutable aminoplast resin as stabilizing agent.
  • Powdery binders are known per se as so-called powder coatings. They are usually produced in such a way that the binder to be used is intensively premixed with pigment, hardener and additives in a mixer. This mixture is homogenized in an extruder. The resulting extrudate is cooled and roughly ground. Fine grinding and sifting result in a processable powder. Aqueous dispersion of powder coatings is also called slurry.
  • the aqueous dispersion contains finely divided plastics as a powdery binder. These have already found their way into the coating of metal objects in the form of powder coatings. These plastic powders are solid at room temperature and easy to grind. They are not reactive in such a way that they film with themselves or with other compatible resins, such as the stabilizing agent, into high-molecular substances even at room temperature. At the usual baking conditions, which are around 160 ° C, however, they melt and combine with the stabilizing agent on the coated substrate to form a homogeneous film.
  • plastic powders from the group of epoxy resins, polyester resins, acrylate resins, polyurethane resins, polyamide resins, polyethylene, polypropylene and cellulose acetobutyrates are suitable as powdered binders. These plastic powders are all known and for the most part commercially available.
  • All powders of this type can be used in the aqueous dispersion according to the invention, provided that they are compatible with the stabilizing agent.
  • the plastic powder can be dispersed in pure form in the aqueous dispersion.
  • a plastic powder that contains fillers it is also possible to use a plastic powder that contains fillers.
  • the pigments and / or fillers have already been incorporated into the plastic powder during its production.
  • the aqueous dispersion of the present invention is not limited only to the fact that it contains only a single synthetic resin. Mixtures of two or more different plastic powders can also be included. One or the other plastic powder may contain pigments and / or fillers, but the other may be free of these additives.
  • the plastic powders used can also contain small amounts of hardening agents and other additives that regulate the flow behavior of the powder during baking. The effects of these additives incorporated into the plastic powder are not negatively affected by the aqueous dispersion.
  • the dispersion contains an aminoplast resin as a stabilizing agent.
  • Amino resins or amino resins are polyphenols which are composed of an amino and a carbonyl component.
  • Suitable amino components are, for example, acid amides, urethanes, sulfonic acid amides, ureas, thioureas, guanidine, sulfuryl amide, cyanamide, dicyandiamide, melamine and guanamines or other aminotriacins.
  • Suitable carbonyl components are, for example, formaldehyde, acetaldehyde, glyoxal, malondialdehyde, glyoxylic acid and acetone.
  • the amino resins obtained from the amino and the carbbnyl component can be converted into water-soluble or water-dilutable derivatives by etherification with low molecular weight alcohols, in particular with methanol.
  • the proportion of these water-soluble or water-dilutable aminoplast resins in the dispersions according to the invention can be 0.5 to 30% by weight, based on the sum of the powdery binder and the aminoplast resin, proportions of 1 to 5% by weight being preferred.
  • aminoplast resins are water-soluble or water-dilutable, i.e. H. in particular derivatives of melamine, benzoguanamine and urea resins having aminoalkylalkoxy groups are preferred. Hexakis (methoxymethyl) melamine is very particularly preferred.
  • the aqueous dispersion can contain proportions of organic solvents which, in combination with water, do not dissolve the powdery binder.
  • the organic solvents can e.g. B. improve the course of the coating agent in some cases.
  • the aqueous dispersion is prepared by the methods known in the paint industry.
  • the constituents of the dispersion can be stirred directly into water or a dispersion of part of the constituents using a high-speed dispersing machine.
  • the coating agent can be prepared by dispersing the powdered binder and the stabilizing agent together in water. It is also possible to mix the powdered binder and the stabilizing agent by extruding them together, and to crush the extrudate and disperse it in water.
  • a particularly good wetting of the powdery binder by the stabilizing agent is achieved in that
  • the binder is ground to a powder with an average particle size of less than 100 ⁇ m
  • a water-soluble or water-miscible aminoplast resin is dissolved in water or mixed with water as a stabilizing agent
  • the ground binder is added to the aqueous solution or mixture of the aminoplast resin and
  • composition obtained is ground to achieve the average particle size of 0.5 to 20 microns.
  • the aqueous dispersion is ideally suited for coating processes such as spraying, brushing, dipping, flooding, rolling or knife coating.
  • the aqueous dispersion is diluted down to a solids content of between 20 and 50%, preferably between 25 and 40%, with water.
  • the pH is between 5 and 9, but preferably between 6 and 8.
  • the properties of the baked coating are excellent.
  • the corrosion resistance is surprisingly good and varies with the nature of the solid powder coating.
  • the burned-in layer can serve as a primer and can easily be further coated with conventional paints. It is also suitable as a top coat.
  • Example 5 100 parts of a commercially available OH polyester based on isophthalic acid, neopentylglykoi and trimethylolpropane with an OH number of about 50 and an acid number of 3 to 5 were combined with 20 parts of an isophorone diisocyanate capped with E-caprolactam, 1 part of leveling agent and 60 parts of titanium dioxide (Rutile type) premixed in the fluid mixer and converted into a powder according to Example 1.
  • Example 5 100 parts of a commercially available OH polyester based on isophthalic acid, neopentylglykoi and trimethylolpropane with an OH number of about 50 and an acid number of 3 to 5 were combined with 20 parts of an isophorone diisocyanate capped with E-caprolactam, 1 part of leveling agent and 60 parts of titanium dioxide (Rutile type) premixed in the fluid mixer and converted into a powder according to Example 1.
  • Example 5 100 parts of a commercially available OH
  • 35 parts of a polyurethane powder according to Example 4 were processed with 2 parts of a methanol etherified benzoguanamine resin and 67 parts of water according to Example 6 to form a coating agent.
  • Example 9 29.7 parts of an epoxy-isocyanate powder according to Example 5 were processed with 1.3 parts of a methanol-etherified urea resin and 69 parts of water according to Example 6 to form a coating agent.
  • Example 9
  • Example 3 35 parts of a polyester powder according to Example 3 were processed with 1.7 parts of a methanol etherified melamine resin (Hexakis (methoxymethyl) melamine) according to Example 6 to form a coating agent.
  • a methanol etherified melamine resin Hexakis (methoxymethyl) melamine
  • a leveling agent 20 g of titanium dioxide (rutile type), 8 g of aluminum silicate, 2 g of iron oxide red, 5 g of a dicyandiamide derivative and 3 , 5 g of a melamine resin (hexakis (methoxymethyl) melamine) were premixed with 201 parts of water and then ground in an agitator mill for 1 hour to
  • Table 1 shows paint tests for slurries and the underlying paint powders

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Paints Or Removers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Dispersion aqueuse d'un liant pulvérulent d'une grandeur particulaire moyenne de 0,5 à 20 mum, contenant un stabilisant, ainsi que, le cas échéant, des pigments, des durcisseurs, des charges et d'autres adjuvants connus. La dispersion contient une résine aminoplaste soluble ou délayable dans l'eau qui sert de stabilisant.
PCT/DE1984/000001 1983-01-10 1984-01-04 Dispersion aqueuse WO1984002711A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19833300561 DE3300561A1 (de) 1983-01-10 1983-01-10 Waessrige dispersion

Publications (1)

Publication Number Publication Date
WO1984002711A1 true WO1984002711A1 (fr) 1984-07-19

Family

ID=6187969

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1984/000001 WO1984002711A1 (fr) 1983-01-10 1984-01-04 Dispersion aqueuse

Country Status (4)

Country Link
EP (1) EP0132261A1 (fr)
DE (1) DE3300561A1 (fr)
IT (1) IT1172997B (fr)
WO (1) WO1984002711A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994006876A1 (fr) * 1992-09-14 1994-03-31 Cytec Technology Corp. Compositions epoxy aqueuses et depourvues de composes organiques volatils pour couches de fond

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1719404A1 (de) * 1963-02-27 1971-06-03 Ciba Geigy Ag Dispergiermittel
FR2293480A1 (fr) * 1974-12-04 1976-07-02 Vianova Kunstharz Ag Produits de revetements diluables a l'eau, sechant au four
DE2613099A1 (de) * 1975-03-28 1976-10-21 Dainippon Toryo Kk Waessrige dispersionsbeschichtungsmassen
EP0008655A1 (fr) * 1978-08-16 1980-03-19 Vianova Kunstharz Aktiengesellschaft Utilisation d'éthers mixtes de résines méthylol-amine comme agents anti-mousse pour peintures diluables à l'eau

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1719404A1 (de) * 1963-02-27 1971-06-03 Ciba Geigy Ag Dispergiermittel
FR2293480A1 (fr) * 1974-12-04 1976-07-02 Vianova Kunstharz Ag Produits de revetements diluables a l'eau, sechant au four
DE2613099A1 (de) * 1975-03-28 1976-10-21 Dainippon Toryo Kk Waessrige dispersionsbeschichtungsmassen
EP0008655A1 (fr) * 1978-08-16 1980-03-19 Vianova Kunstharz Aktiengesellschaft Utilisation d'éthers mixtes de résines méthylol-amine comme agents anti-mousse pour peintures diluables à l'eau

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1994006876A1 (fr) * 1992-09-14 1994-03-31 Cytec Technology Corp. Compositions epoxy aqueuses et depourvues de composes organiques volatils pour couches de fond
US5461090A (en) * 1992-09-14 1995-10-24 Cytec Technology Corp. Aqueous, essentially VOC-free adhesive epoxy primer
US5576061A (en) * 1992-09-14 1996-11-19 Cytec Technology Corp. Aqueous, essentially VOC-free adhesive epoxy primer
US5641818A (en) * 1992-09-14 1997-06-24 Cytec Technology Corp. Aqueous, essentially voc-free adhesive epoxy primer

Also Published As

Publication number Publication date
EP0132261A1 (fr) 1985-01-30
IT8419103A0 (it) 1984-01-10
DE3300561A1 (de) 1984-07-12
IT1172997B (it) 1987-06-18

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