Coating processes – Direct application of electrical – magnetic – wave – or... – Electrostatic charge – field – or force utilized
Patent
1996-08-01
1999-06-29
Dudash, Diana
Coating processes
Direct application of electrical, magnetic, wave, or...
Electrostatic charge, field, or force utilized
427185, 427202, 427409, 427470, B05D 104, B05D 122, B05D 138, B05D 714
Patent
active
059166398
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to a process for producing a metallic material coated with a synthetic resin, which is not only excellent in decorative coating, corrosion protection, electric insulation, wear resistance and weatherability but also highly improved in the adhesion between the metallic material and the coating, by coating the surface of a metallic material in the form of a pipe, a filament, a rod, a plate, etc. with a synthetic resin such as a thermoplastic resin or a thermosetting resin via a specific primer. The present invention also relates to a primer composition for powder coating.
RELATED ART
As primers for powder coating with thermoplastic powders, in particular, nylon powders, there have been already employed compounds obtained by polymerizing diene compounds such as polybutadiene. After being applied and dried, these primers are baked in a high-temperature oven. Accordingly, there have been employed primers containing halogenated hydrocarbons such as trichloroethane as a medium from the viewpoints of dryability and fire prevention. To meet the demands of the times to protect the ozone layer from the standpoint of the global environment, however, there arises a trend of restrictions on the use of halogenated hydrocarbons such as trichloroethane and chlorofluorocarbons. Although it has been proposed to use lower aliphatic or aromatic hydrocarbons as substitutes therefor, these compounds suffer from a number of problems in disaster prevention and working environments, for example, a low flash point and a toxic effect on the human body.
The present inventor has invented a primer which contains water as a medium and is superior in adhesion to the conventional products by mixing a partly acid-modified diene polymer with an organic amine or ammonia. Because of the use of water as a medium, this primer can solve the problems relating to disaster prevention and working environments with a single stroke.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention provides a primer composition for powder coating, which contains water as a medium, prepared by mixing an acid-modified diene polymer with an organic amine or ammonia and a process for producing a synthetic resin-coated metallic material characterized by applying the above-mentioned primer composition for powder coating onto a metallic surface, curing and baking the same and then coating it with a synthetic resin by a fluidized bed dip coating method or the electrostatic coating method. The term "acid-modified diene polymer" as used herein means a polymer obtained by copolymerizing a compound having a conjugated double bond (for example, butadiene or isoprene) with a compound such as acrylic acid, methacrylic acid or maleic anhydride or polymerizing a compound having a conjugated double bond and then treating the polymer thus obtained with, for example, maleic anhydride.
In other words, the present invention relates to a primer composition for powder coating which comprises an acid-modified diene polymer, an organic amine or ammonia and water or a process for producing a metallic material coated with a synthetic resin, which involves the step of applying the above-mentioned primer composition for powder coating onto the metallic surface, the step of curing the same by heating, and the step of coating it with a synthetic resin by a fluidized bed dip coating method or an electrostatic coating method.
It is preferable to mix the components at a ratio of from 5 to 50 parts by weight (still preferably from 15 to 30 parts) of the organic amine or ammonia and from 300 to 1,500 parts by weight (still preferably from 400 to 900 parts) of water per 100 parts by weight of the acid-modified diene polymer. When the mixing ratio lies within the range as defined above, the present invention can be preferably embodied while considering stable dispersion, shortening of drying time and an appropriate concentration of solid matter.
In the present invention, the carboxylic acid unit is introduced into the polymer in order to disp
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Chemical Abstracts, vol. 96, No. 14, Apr. 5, 1982, Abstract No. 105910.
Daicel Huels Ltd.
Dudash Diana
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