Abstract:
A method for powder coating plastic substrate. The substrate in one embodiment is a formed part for a vehicle made from a polypropylene base, polyolefins or acrylonitrile butadiene styrene. The method also further involves providing a conductive adhesion promoter, such as a chlorinated polyolefin that includes a conductive carbon black filler. A powder coat material is applied at a later step and then is melted onto the substrate creating a finished part having a high quality finish.
Abstract:
This invention provides a water-based primer composition comprising (A) an aqueous dispersion of modified polyolefin, (B) an aqueous urethane resin and/or aqueous acrylic resin, (C) a pyrazole-blocked polyisocyanate compound and (D) an electrically conducting pigment, its (C) pyrazole-blocked polyisocyanate compound content being within a range of 5-50 mass % based on the total solid content of the components (A), (B) and (C), said electrically conducting pigment (D) containing an electrically conducting metal oxide (D-1), and the content of the electrically conducting pigment (D) being within a range of 50-200 mass parts per 100 mass parts of the total solid resin content in the composition; and also methods for coating plastic shaped articles using the composition.
Abstract:
Filler particles of a moisture-permeable, organic polymeric material are used in a polymeric coating composition, and this composition can be applied to a surface of a molded, fiber-reinforced polymeric material, such as sheet molding compound (SMC), to enable the electrostatic application of a layer of a powder primer to the same surface overlying the polymeric coating. And, when the molded SMC is heated to cure the powder primer layer, the out-gassing of moisture from the heated SMC does not result in defects on the surface of the molded SMC.
Abstract:
A method of electrostatic spraying of a polymer surface involves oxidation and treating the oxidised surface with a polyamine and an electroconductivity modifying agent which contains a mono-carboxylic acid of from one to 12 carbon atoms.
Abstract:
An emulsion for preparing a low-conductivity surface for powder coating, the emulsion including an emulsified organofunctional silane solution. A pre-powder coating emulsion provides a surface with conductivity. A non-conductive object having applied to an exterior surface of the object the emulsion including an emulsified organofunctional silane solution.
Abstract:
A method for applying hot melt adhesive powder onto a non-metallic object surface comprises the steps of applying a cleaning agent, applying a conductive liquid, radiating, spraying hot melt adhesive powder; and heating. A system for applying hot melt adhesive powder onto a non-metallic object surface comprises a convey belt, a radiation chamber, a spraying chamber and a heating chamber. The convey belt is used to deliver a non-metallic object treated by a cleaning agent and a conductive liquid through the radiation chamber where the surface of the non-metallic objected is radiated by ultraviolet rays and ozone and then through the spraying chamber where the surface of the non-metallic object is sprayed with charged hot melt adhesive powder, and finally into the heating chamber where the hot melt adhesive powder attached onto the non-metallic object will be melted into a liquid adhesive film ready to be bonded.
Abstract:
An improved process for electrostatically coating a medical device is described. Temporary conductivity is induced into the surface of a medical device whose surface is normally non-conductive. After inducing temporary conductivity to the surface of the device, it is electrostatically coated either through liquid formulation spray coating or through dry powder deposition. The process provides a high degree of uniformity and control over the coating such that the fine features of the device that are necessary for device function are carefully maintained after the coating is applied.
Abstract:
Methods for combining conductive filled low surface energy substrates, such as but not limited to polyolefins, and flame applied nitrogen based coupling agents are described. The methods include adding a conductive material to a surface and or matrix of the thermoplastic substrate so as to form a conductive thermoplastic substrate and a flame applied nitrogen-based coupling agent to form functional groups on the conductive thermoplastic substrate. The methods provide improved paint transfer efficiency, paint coverage, and adhesion durability characteristics. The methods are especially suitable for paintable automotive components, such as but not limited to exterior body panels, fascias, and the like.
Abstract:
An agent for providing an electrostatic coating property and improving the water resistance of a coating film comprises 100 weight parts of an aromatic ring-containing polyetheresteramide (A) derived from a polyamide having carboxyl groups at both ends and having a number average molecular weight of 500 to 5,000 and an alkylene oxide adduct of bisphenols having a number average molecular weight of 1,600 to 3,000; and 5 to 100 weight parts of a vinyl copolymer comprising as essential constituent units a vinyl monomer (b1) having a sulfonic acid (or sulfonate) group and at least one monomer (b2) selected from vinyl monomers having a functional group that is reactive with (A). Thus, an agent for providing an electrostatic coating property and improving the water resistance of a coating film that allows electrostatic coating immediately after molding without the coating of a conductive primer for under coating in electrostatically coating a styrene-based resin molded article and provides an excellent water resistance for a coating film after coating, and an electrostatically coated resin molded article using the same are provided.
Abstract:
The present invention is directed to improved conductive primer compositions and methods. In the improved methods aspect of the present invention, a non-conductive polymeric component is precoated with a primer to render it electroconductive in preparation for electrocoating. Next, the primed polymeric comonent is assembled with a conductive metallic component to form a multi-material workpiece. Finally, the formed workpiece is submerged in an electrocoat bath for simultaneously electrocoating both the primed polymeric component and the conductive metallic component. In some preferred embodiments, the workpiece may be an automobile body. In the improved electroconductive primer compositions aspect of the present invention, such compositions comprise a dispersion of approximately 70% to 90% of a polymeric resinous which will cure to form a film, approximately 10% to 30% of a conductive carbon pigment, in some embodiments approximately 0.25 to 0.45 of an electron transmitting or other surfactant or dispersing agent, and a sufficient volume of solvents to provide a flowable viscosity to the primer. Such primer may be formed from a wide variety of different resins.