Preparation and characterization of weather resistant silicone/acrylic resin coatings

• Published in: JCT, Journal of Coatings Technology Vol. 75; no. 936; pp. 55 - 64
• Main Authors: PARK, H.-S, KIM, S.-R, PARK, H.-J, KWAK, Y.-C, HAHM, H.-S, KIM, S.-K
• Format: Journal Article Trade Publication Article
• Language: English
• Published: Blue Bell, PA Federation of Societies for Coatings Technology 2003; American Coatings Association, Inc
• Subjects: Acrylics; Applied sciences; Coatings. Paints, varnishes and inks; Components, formulation; Curing; Exact sciences and technology; Paints; Physical properties; Polyesters; Polymer industry, paints, wood; Polymers; Protective coatings; Resins; Retention; Silicones; Test methods; Viscosity; United States > US; Viscosity; Coating material; Color; Paint film; Paint; Experimental study; Binders; Methyl methacrylate copolymer; Butyl acrylate copolymer; Physical properties; Thermal stability; Thermal properties; Formulation; Optical properties; Preparation; Weatherability; Siloxane copolymer; Butyl methacrylate copolymer; Rheological properties
• ISSN: 0361-8773; 2168-815X
• DOI: 10.1007/bf02697923

Preparation and characterization of weather resistant silicone /acrylic resin coatings were conducted. In order to prepare these coatings, a silicone/acrylic resin (KLD) was first prepared by an addition polymerization reaction of monomers, including n-butyl acrylate, methyl methacrylate, n-butyl methacrylate, and 3-methacryloxypropyltrimethoxysilane (MPTS). In the preparation of the silicone/acrylic resin, T sub g of the acrylic copolymer was fixed at 40 deg C and the contents of MPTS were varied to be 10, 20, and 30 wt%. The weather resistant silicone/acrylic resin coatings were then prepared by blending the synthesized silicone /acrylic resin and TiO sub 2 . The viscosity of the synthesized resin decreased with the content of MPTS, whereas the thermal stability at high temperature increased. The prepared coatings exhibited excellent adhesion to various substrates, and various physical properties of the coatings were satisfactory, The weatherability of the coatings was tested three ways: outdoor exposure test, Weather-Ometer (WOM), and QUV accelerated weatherability tester (QUV). The gloss retention, yellowness index difference, color difference, and lightness index difference were improved at high MPTS concentration. The coatings containing 30 wt% MPTS have especially good weather properties. [Substrates: cold-rolled carbon steel, tin, glass, aluminum, PET, brass; applications: architectural.]