This paper describes the polyaspartics coating technology and how it can be used to formulate relatively fast-drying two-coat, corrosion-resistant paints for use on steel substrates. The polyaspartics coating technology offers several advantages over the conventional two- and three-coat paints, including faster re-coat windows leading to an overall faster coating application process and lower costs. The coating chemistry is described in general terms and the results of accelerated exposure tests are presented to demonstrate the good corrosion resistance that can be achieved with this technology.

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Technical slide presentation from Bayer. Polyaspartic esters are 100% solids, low viscosity, secondary amine resins that allow you to tailor make your system with cure times from minutes to hours!

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This paper describes a super high solid anti-corrosion topcoat based on newly developed polyurethane raw materials and offering significant productivity advantages over the conventional two-component polyurethane (2K PUR) topcoats currently used for corrosion protection. The designation “super high solid” is intended to convey the fact that the solvent content is so low as to equal the solvent content of water- reducible coatings. The super high solid coating described satisfies the most stringent requirements for corrosion resistance. Its application properties facilitate productivity-optimized processes in corrosion protection applications. With its excellent tolerance to high film thicknesses, it also offers economic advantages over the coatings in use today without sacrificing quality.

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This paper compares the use of ketimines and aldimines as blocked primary amines in such formulations. These are low viscosity materials that are significantly less reactive than the parent amines. This combination makes them excellent candidates for reactive resins used in high solids coatings. Aspects of imine-isocyanate chemistry presented include the direct reaction of imines with polyisocyanates as well as the relative hydrolytic stability and reactivity of aldimines verses ketimines. The impact of each of these aspects on the application properties of coatings will be discussed briefly.

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Building on the foundation of the aldimine-isocyanate chemistry discussed in the previous paper, this paper demonstrates the adaptation of this chemistry to actual applications. As VOC levels decrease, the need for low-viscosity resins, and particularly coreactant resins, increases. Aldimines were developed to meet this need. The reaction mechanism of aldimines with polyisocyanates allows for formulation of coatings having long pot lives and surprisingly fast dry times without sacrificing film properties.

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Polyaspartic esters are a new type of amine functional coreactant for aliphatic polyisocyanates. Currently, a number of polyaspartic ester products are coming to market for use in very high solids two-component automotive coatings. In addition to providing tough, high gloss finishes, the polyurea coatings produced by this chemistry show superior weathering and environmental etch performance. This paper details a method for controlling the reactivity of these resins toward isocyanates and how they can be successfully employed in producing very high solids coatings.

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This paper discusses in detail the status of polyurethanes in European and US wood markets. A basic overview of polyurethane chemistry is presented along with the performance characteristics of solventborne polyurethane coating systems and formulation strategies for both one- component and two-component solventborne coating systems. The paper concludes by highlighting recent developments in high solid polyurethane systems based on polyaspartic ester and aldimine chemistry.

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