Electrocoating Systems for Automotive Paint

A one-component topcoat composition with improved yellowing resistance for automotive coatings. The composition comprises a silane acrylic resin, an acrylic polyol resin, a hardener, a curing accelerator, and a blocking agent. The composition combines these components in a specific ratio to create a film with enhanced yellowing resistance, while maintaining excellent gloss and mechanical properties.

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Water-based two-component mid-coat paint for automotive applications that enables construction under extreme environmental conditions. The paint combines a hydroxyl-free polyurethane dispersion with an aqueous hydroxyl-containing acrylate dispersion, achieving enhanced adhesion and film properties through synergistic cross-linking. The dispersion formulation balances rapid drying and thickening characteristics with improved solubility and water resistance. The paint exhibits excellent performance in high-temperature, low-humidity environments while maintaining smooth surface finish and excellent mechanical properties.

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Water-based two-component polyurethane topcoat for automotive coatings that addresses the challenges of high-temperature, high-humidity environments. The coating combines a hydroxyl-containing aqueous dispersion with an aqueous polycarbonate-containing aliphatic anionic polyurethane dispersion, achieving superior performance in sagging resistance, thermal stability, and water resistance. The dispersion is formulated with a specific balance of surfactants, defoamers, and rheological agents that enable optimal film formation and leveling properties. The coating can be applied as a single-component system or as a combination of the dispersion and a conventional clearcoat.

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A method for painting vehicle bodies and components through a novel two-step process that reduces production energy while maintaining high-quality finishes. The process involves applying a phosphating or silane layer to the vehicle surface, followed by a primer application step using cathodic dip painting. The primer is then cured at lower temperatures (90°C) before applying a base coat, which is cured at a higher temperature (125°C). This sequential curing approach enables precise control over paint thickness and finish characteristics without requiring high-temperature curing steps, thereby significantly reducing energy consumption compared to conventional processes.

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Water-based metallic paint for automotive interior and exterior decoration that achieves comprehensive application on plastic automotive parts without thinning, while maintaining excellent adhesion, water resistance, and mechanical properties. The paint formulation employs a unique blend of solvents and polymers that enable continuous spraying on automated assembly lines, while its water-based formulation reduces VOC emissions and environmental impact compared to traditional solvent-based coatings. The paint's performance characteristics include excellent adhesion, water resistance, recoatability, and mechanical properties, making it suitable for automotive interior and exterior decoration applications.

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A method for producing multicoat paint systems by producing a basecoat directly on the substrate, followed by a clearcoat directly on top, with a curing step after application. The process involves applying a basecoat material comprising color and/or effect pigments, which is either an aqueous dispersion (D1) or an aqueous dispersion (D2) of polyamide (PA) with acid number 15-60 mg KOH/g or polyamide (PA) with acid number 15-60 mg KOH/g and amide wax (AW), directly to the substrate. The basecoat material is then flashed and dried before applying the clearcoat, which is cured through a wet-on-wet process. This approach eliminates the need for separate curing steps between basecoat and clearcoat, achieving higher film thicknesses and improved properties compared to conventional multicoat production methods.

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High-solid three-coat and one-baking mid-coat paint for automobiles based on water-based acrylic resin, featuring a single-component midcoat. The paint combines a water-based acrylic emulsion with a polyurethane dispersion, achieving a solid content of 34-44% while maintaining excellent appearance performance, stone impact resistance, and mechanical properties. The midcoat is applied in three layers, with the first layer being a water-based coating, followed by a flash-dried layer, and then a baking layer. This innovative approach enables a midcoat with improved performance characteristics compared to conventional three-coat systems.

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A two-layer paint system for automotive interior parts that combines high adhesion and wear resistance properties through a novel primer-topcoat combination. The system employs a waterborne epoxy primer that provides excellent adhesion to various substrates, followed by a polyolefin-based topcoat that enhances wear resistance and antifouling properties. The primer is modified with silazane to improve dispersion and compatibility, while the topcoat incorporates fluorinated diethylenetriamine and perfluoropolyether to further enhance performance. This dual-layer approach addresses the challenges of automotive interior coatings, particularly in terms of adhesion, wear resistance, and environmental protection.

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Automotive body coating method that reduces VOC emissions through a multi-step process involving pretreatment, electrophoresis, electrophoresis drying, electrophoresis polishing, and coating application. The method employs powdery coatings A and C, with A being powdery paint and C being powder varnish, which are sprayed onto the vehicle body followed by subsequent steps of electrophoresis drying, polishing, and coating application. The process ensures consistent color tone and gloss while maintaining chemical resistance and corrosion protection properties.

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A method for forming a multi-layer coating film using a curable resin composition for paints. The method involves sequential application and heat-curing of intermediate coating paint, base coating material, and clear coating material. The intermediate coating paint, base coating material, and clear coating material are applied in that order, with the intermediate coating paint having a temperature range of 10-40°C and relative humidity of 65-85%. The clear coating material is cured at a temperature of 100°C or less. The method enables the formation of a multi-layer coating film with improved adhesion and appearance characteristics compared to conventional multi-layer coating methods.

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Water-based automotive topcoat that achieves superior gloss, weather resistance, and hardness without the need for solvents. The coating is prepared through a unique combination of water-based dispersion and fully methyl-etherified amino resin, which are combined with weather-resistant pigments and dispersants. The dispersion is formulated with a specialized wetting agent and leveling agent to achieve optimal grinding properties, while the dispersant enhances pigment dispersion. The resulting coating exhibits excellent gloss retention, UV resistance, and mechanical properties, making it suitable for automotive applications where conventional solvents are prohibited.

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A water-based automotive paint system that enables integrated application of the paint to both body panels and exterior parts through a single-step process. The system consists of a water-based paint comprising a core-shell acrylic emulsion with controlled water content, and a curing agent that enables the paint to perform both wet-on-wet and low-temperature curing. The curing agent facilitates the formation of a cross-linked polymer network that enables the paint to meet the requirements of both wet-on-wet and low-temperature baking processes. The paint can be applied through a single-step process that combines pretreatment, electrophoresis primer treatment, and a specialized spraying and welding process.

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High-solid automotive finishing varnishes that achieve VOC emissions below 420g/L through a novel composition of high-solid acrylic, polyester, and n-butanol-etherified amino resins. The varnishes contain a high-etherification degree n-butanol-etherified amino resin that replaces the traditional anti-sagging resin, enhancing paint film stability. The varnishes also incorporate conductive additives and a specific viscosity adjustment process to optimize performance while maintaining low VOC emissions.

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A water-based, all-in-one paint system for vehicle undercarriage that combines excellent corrosion protection, adhesion, and durability. The paint film is formulated with a unique blend of hydrophobic and hydrophilic components that provide superior wetting and bonding properties, while maintaining thermal stability and flexibility. The system is designed to be environmentally friendly, with VOC-free formulation and a low-VOC curing process. The paint provides comprehensive protection for vehicle undercarriage components while maintaining a smooth, comfortable finish.

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Method for forming multilayer coating films with improved image quality, smoothness, and chipping resistance through a single-step curing process. The method involves applying a base coating composition, followed by a water-based intermediate coating, and then curing the intermediate coating before applying a clear coating. The intermediate coating is preheated only once, eliminating the need for separate intermediate coating steps. This single-step approach enables simultaneous curing of the base and intermediate coatings, resulting in a multilayer film with enhanced image quality, reduced chipping, and superior mechanical properties.

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A waterborne automotive paint composition that addresses the critical issue of preventing metal flash rust during paint application. The composition combines a water-based polyurethane curing agent with a specialized acrylic emulsion and additives that enhance sandability, adhesion, and crosslinking density. The emulsion formulation features a unique combination of acrylic components, including styrene, methyl methacrylate, and ethyl acrylate, along with dispersants, defoamers, pigments, fillers, film-forming aids, wetting agents, anti-rust agents, and thickeners. This composition provides superior performance in washing operations while maintaining compliance with stringent regulatory requirements.

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A method for producing multicoat paint systems that enables rapid, cost-effective production of complex automotive coatings. The process involves producing a single coating system comprising a surfacer and topcoat, where the surfacer is cured to form a cross-linked film. The topcoat is then cured to form a second cross-linked film. This single-step process eliminates the need for sequential curing steps and enables the production of coatings with improved properties compared to traditional wet-on-wet methods.

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Waterborne acrylic emulsion for automotive electrocoating finish paint that provides superior adhesion and wet film properties. The emulsion comprises an aqueous dispersion of an acrylic polymer latex, a specific type of initiator, and a co-initiator, wherein the initiator is an alkylphenol-formaldehyde resin and the co-initiator is a tertiary amine. The emulsion demonstrates improved water resistance, film adhesion, and leveling performance compared to conventional waterborne acrylics, particularly when applied over electrocoated substrates.

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Waterborne polyester resin-based automotive coating for improving vehicle body surface finish through a novel intermediate layer. The coating composition comprises a waterborne polyester resin with specific weight distribution, particularly containing hydroxyl groups and ester functionalities, which enables enhanced gloss retention and reflective properties while maintaining low VOC emissions.

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