Research for Tomorrow s Silicone Modified inorganic-organic hybrid polymers for high heat resistance and weatherable paints and Technology coating application Unit Nos. D107 to D112, Kailash Indusrtrial Complex, VikhroliHiranandani Link Road, Vikhroli (W), Mumbai 400 079, India www.nsccindia.com
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SILICON
SILICONES - What are they? Bond Type C-F 105 Energy (kcal/mole) Si-O 88-114 C-O 84 C-C 83 Si-C 63 sp 3 hybridized Si(1.8)-O(3.5) = 1.7 Bond length = 1.645 A
SILICONES - What are they? Organosilicon compounds Structurally thought to be like ketone Ketones Silicones =C=O =Si=O Silanes PDMS or Polysiloxanes Silicone SILICONES Chlorosilanes Alkoxysilanes Organofunctional silanes/siloxanes and so on
Properties of silicones Low surface tension Nonionic/nonpolar characteristics Unique solubility characteristics Hydrophobicity Thermal stability Oxidation resistance Good dielectric properties Liquid at high molecular weight Stability over wide temp range (-70 C to 200 C) Low flammability Relatively inert Nontoxic Environmentally safe Excellent weatherability
Organoreactive polysiloxane H 2 C Si O Si O Si O Si R n CH 2 R NH 2 - Amine neutralization, Isocyanate curing, surfactants COOH - Amine neutralization- wetting agents, surfactants OH Isocyanate curing OR- Moisture curing, Organic modification CH=CH 2, COO CH=CH 2 UV Curable, reactive diluents, copolymerization OCH 2 CH 2 O -Surfactants
Nonreactive polysiloxane H 3 C Si O Si O Si O Si n Polydimethylsiloxane or Silicone Oil Compatibility Normally, silicones are not compatible with organic polymers. But if a larger organic group is attached to a silicone, its properties are altered, and it behaves more like an organic polymer. Substantivity Non-reactive silicones lack substantivity. But if an organoreactive group, such as an aminopropyl group, is attached to the silicone, the silicone becomes reactive and will form stable bonds with other organic polymers.
Organoreactive Silane RESIN FLUIDS O Si O O O Si O EPOXY CURING AGENT H 2 C H 2 C O Si O Si O Si O UV CURABLE/CO-POLYMN HN CH 2 CH 2 -CH 2 -NH 2 CH=CH 2 O H 2 C HC-H 2 C-O-H 2 C-H 2 C-H 2 C Si O O PROTECTIVE COATINGS O
Inorganic-Organic Hybrid (Flexible Ceramic) Inorganic Network Ceramics Hardness Thermal stability Chemical resistance Functional Group IOH Organic Network Silane Organic Polymer Weatherable Surface Energy Flexibility and Toughness Processing Functionalization
IOH polymers Epoxy Silicone Silicone Polyester Silicone PU Acrylic Polysiloxane
High Heat Resistant Epoxy Silicone Resin Silicone-Epoxy resin for high heat resistance anti-corrosive Coatings Heat resistance up to 650 0 C (when formulated with metallic or other specialized pigments) Suitable for anti-corrosive heat-resistance coatings Suitable for single component (@180 0 C/ 1hr ) and two component application (amine hardeners)
High Heat Resistant Epoxy Silicone Resin Thermal Shock Test: 650 C for 4 hr followed by immediate water quenching 650 C for 4 hr X 5 cycle No Blistering No Coating Peel off ΔE = 1.02
High Heat Resistant Epoxy Silicone Resin Properties Test Method Observation Pencil Hardness ASTM D 3363 3H Cross cut adhesion ASTMD 3359 4B Method B Erichsen Impact Test ( 1.6 Kg / 60 cm ) ASTMD 2794 Face-passes Reverse- Pass Conical Mandrel ASTMD 522 Passes 1/4 " ASTM D 3359 Conical Mandrel ASTMD 522 Passes 1/4 " Scratch hardness ASTM 4060 2000 g ASTM D 522 Erishen Cupping Test ASTM E 643 9.26 mm ASTM E 643
High Heat Resistant Epoxy Silicone Resin Salt Spray Test 0 hr 200 hr ASTM B117 400 hr
High Heat Resistant Polyester Silicone Resin Heat resistance up to 350 0 C (when formulated with metallic or other specialized pigments) Suitable for designing cookware, bakeware, electrical appliances Can be used for primer and top coats Gloss : 89-91 Whiteness: 90-92 Brightness: 93-94
High Heat Resistant Polyester Silicone Resin 350 C for 4 hr X 5 Cycle No Blistering No Coating Peel off Gloss Retention: 99% Yellowness:
High Heat Resistant Polyester Silicone Resin Properties Test Method Observation Pencil Hardness ASTM D 3363 4H Cross cut adhesion ASTMD 3359 Method B Erichsen Impact Test ( 1.6 Kg / 60 cm ) ASTMD 2794 5B Face-passes Reverse-Pass Conical Mandrel ASTMD 522 Passes 1/4 " Conical Mandrel ASTMD 522 Passes 1/4 " IS 13213: 24 hr Scratch hardness ASTM 4060 2500 g
Silicon-PU* : Functionalized Pure Acrylic Polyol Functionalized acrylic polyol Designed to formulate anti-graffiti polyurethane coatings Resistant to stains like tea, coffee, shoe polish, turmeric, sauce etc. Excellent flexibility and exterior durability High gloss and gloss retention Available in different Tg Applications It can be used to formulate Anti-Graffiti clear top coats for Furniture Automotives & Public transports Railway wagon & Coaches Bus body Stadiums, platforms and other public places. Cleaning S.K. Ghosh et al, Progress in Organic Coatings 65 (2009) 444 449
Acrylic Polysiloxane Silicone Macro-monomers and specially designed functional silicone hardeners Isocyanate-free inorganic organic Acrylic Polysiloxane system The cured films behave like inorganic ceramic with excellent scratch as well as abrasion resistanc Superior weathering performance over PU Better mechanical and chemical performance than Epoxy Excellent flexibility (passed the cylindrical (0.5 inch) mandrel bend test) 80% gloss retention in 2500 hours QUV (B) exposure Potential Applications Coatings for wind-mill blades Offshore structures Antifouling coatings industrial machineries Bridges & Stadiums
Acrylic Polysiloxane Properties Test Method Observation Pencil Hardness ASTM D 3363 5H Cross cut adhesion ASTMD 3359 Method B Erichsen Impact Test ( 1.6 ASTMD 2794 Kg / 80 cm ) 4B Face-passes Reverse-Pass Conical Mandrel ASTMD 522 Passes 1/4 " ASTMD 522 Conical Mandrel ASTMD 522 Passes 1/4 " Abrasion Resistance ASTM 4060 88 mg @1000 cycles on CS17 1 kg Scratch hardness ASTM 4060 3000 g ASTM 4060
Acrylic Polysiloxane ASTM E 643 IS 13213: 24 hr ASTM D 4752
Acrylic Polysiloxane 2000 hr QUV B313 Test ASTM D 4587 Cyclic Corrosion ASTM D 5894 Standard Epoxy Paint ASTM B 117 Acrylic Polysiloxane Paint ΔE Exposure Time (hr)
Area of Applications Coatings for Aerospace Defense equipments Windmill blade Car Windshield Anti graffiti Facade paints Water repellency Industrial topcoats Marine Furniture Floor
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