Studies on Synthesis and Characterization of Aqueous Hybrid Silicone-Acrylic and Acrylic-Silicone Dispersions and Coatings. Part I

Abstract

The objective of the study was to investigate the effect of the method of synthesis on properties of aqueous hybrid silicone-acrylic (SIL-ACR) and acrylic-silicone (ACR-SIL) dispersions. SIL-ACR dispersions were obtained by emulsion polymerization of mixtures of acrylic and styrene monomers (butyl acrylate, styrene, acrylic acid and methacrylamide) of two different compositions in aqueous dispersions of silicone resins synthesized from mixtures of silicone monomers (octamethylcyclotetrasiloxane, vinyltriethoxysilane and methyltriethoxysilane) of two different compositions. ACR-SIL dispersions were obtained by emulsion polymerization of mixtures of the same silicone monomers in aqueous dispersions of acrylic/styrene copolymers synthesized from the same mixtures of acrylic and styrene monomers, so the compositions of ACR and SIL parts in corresponding ACR-SIL and SIL-ACR hybrid dispersions were the same. Examination of the properties of hybrid dispersions (particle size, particle structure, minimum film forming temperature, Tg of dispersion solids) as well as of corresponding coatings (contact angle, water resistance, water vapour permeability, impact resistance, elasticity) and films (tensile strength, elongation at break, % swell in toluene), revealed that they depended on the method of dispersion synthesis that led to different dispersion particle structures and on composition of ACR and SIL part. Generally, coatings produced from hybrid dispersions showed much better properties than coatings made from starting acrylic/styrene copolymer dispersions.

One‐step mini‐emulsion copolymerisation of waterborne polysiloxane‐modified polyacrylate/pigment hybrid latex and its application in textile pigment printing

“…It was observed that the T g of the PAcr part of the Si‐PAcr/PB latex films with different silicone dosages showed a decreasing trend. Compared with the PAcr/PB latex film, the T g values of the Si‐PAcr/PB‐20/1, Si‐PAcr/PB‐30/1 and Si‐PAcr/PB‐50/1 hybrid latex films decreased to 10.46, 8.46 and 8.32°C, respectively, which was a result of the plasticising effect of siloxane 31,37 . Those lower values of T g implied high flexibility and mobility of the copolymer chain.…”

“…So, it is reasonable to consider if precursor silane can be directly introduced to the PAcr chains and whether the formation of a much more compatible and high‐performance hybrid material should be expected. Although PAcr‐silicone combining resins have been studied previously, and the properties of such hybrid dispersions, coatings and films investigated by Kozakiewicz et al, 29–31 research on pigment hybrid films is very limited. The influence of the molecular structure of PAcr‐silicone copolymer on the textile pigment printing performance of waterborne self‐adhesive hybrid pigment is unknown and needs to be investigated.…”

Recently Emerging Nanotechnological Advancements in Polymer Nanocomposite Coatings for Anti-corrosion, Anti-fouling and Self-healing

“…In some studies, enhancements in corrosion hinderance and mechanical strength have been attained. These enhancements in properties are demonstrated in incremental cohesive and adhesive behaviors of the nano-architecture attributed to appropriate dispersion of nanofillers in the matrix [40] , [41] , [42] , [43] . Additionally, both anti-scratch and anti-wear resistances are enhanced with increasing nanoparticle weight percent in polymeric matrices [44] .…”

Polymeric materials used in the preservation of historical stone buildings

“…In contrast, acrylic systems are much less permeable to gases and vapors, which causes unfavorable sealing of the building material [32]. In order to achieve high surface hydrophobicity and water resistance combined with good water vapor permeability hybrid silicone-acrylic dispersions can be used [33].…”