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Environmental, market, and cost pressures have led to the development of alternatives to conventional 2K polyurethane topcoats, including isocyanate-free binders. For example, 1- and 2K coating systems based on alkoxysilane chemistry find increased use in protective coatings.
Environmental, market, and cost pressures have led to the development of alternatives to conventional 2K polyurethane topcoats, including isocyanate-free binders. For example, 1- and 2K coating systems based on alkoxysilane chemistry find increased use in protective coatings. Besides conventional acrylic monomers, polymer chemists have at their disposal various versatile building blocks, such as neoacid derivatives. Neoacid esters are widely used to upgrade solvent- and waterborne resins for both decorative and protective coatings. Among other benefits, these very hydrophobic monomers reduce surface tension and improve flow, durability, chemical, and UV resistance. This paper presents a new family of polymers, combining neoacid esters and alkoxysilane monomers. Variation of process parameters, monomer composition, and level of alkoxysilane yielded a series of polymers with a range of properties. Polymers with solids content ranging from 70- to 100-% were produced using this technology and were formulated into 1- and 2K protective coatings (both clear and pigmented). These coatings were compared with 2K polyurethane and acrylic silane systems for usual performance parameters. The paper displays performance of the various coating systems and discusses the relationship between resin processing/composition and coating performance
Coating practitioners are aware that single coat, thick film solvent-free epoxy linings have gained acceptance for their promise of productivity benefits which include a potential quick return to service for newly applied tank linings. From the vantage point of owners, applicators, inspectors and coating manufacturers this paper examines productivity and performance issues associated with a tandem approach of using a thin film solvent borne epoxy holding primer (especially over pitted steel) with a coat of solvent-free epoxy lining as opposed to using a single coat of a solvent-free lining applied direct to metal.
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Conference Paper - This paper describes the requirements of the standard, additional inspection points, and several uses of the standard in the field where clear specification language was imperative to successful project completion. NACE 5/SSPC-SP 12 standard confined to water jetting - which makes use of ultra-high pressure water that is nonabrasive. Four levels of visible post-cleaning condition and three levels of non-visible condition are defined.