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Surface Finishing Tutorial

#177 Paint Types - 5 Silicone resin paint

Category : Painting
January24, 2014

(9) Silicone resin paint

A silicone resin is a condensate based on silicon. Pure silicone is not often used as paint, but modified silicone resins with modifying agents such as alkyd, epoxy, phenolic, acrylic, melamine resins are used.
Regardless of whether pure silicone resin or modified silicone resin, the silicone resin paints are well known for the excellent heat resistance, cold resistance, chemical resistance, weatherability and electrical insulation properties.

Pure silicone resin pints are polymers with methyl and phenyl groups, with heat resistance of 200~250℃. With increased amounts of methyl group, the flexibility and water repellency will increase, but the heat resistance will decrease.
The modified silicone resins are of modified with alkyd resin, polyester resin, epoxy resin, acrylic resin, etc. with heat resistance to 150~200℃.
Inorganic filler added silicone resin paints have resistant pigments, aluminum powder, graphite, or a ceramic powder as the additives, with high heat resistance of 300~650℃.

Primary uses for the silicone resin paints are as heat resistant paints for engines, exhausts or heat absorbing tubes, reaction vessel inner surfaces at chemical plants, heaters, furnaces, chimneys, etc.
Also, the silicone resin paints are used for electrical resistant painting and Impregnation on motors, transformers, copper wire, glass woven fabric, and bonding of mica laminates.

(10) Fluorine resin paint

For fluorine resin paints, polymers of fluorine-containing monomers such as ethylene fluoride, fluorinated ethylene chloride, vinyl fluoride, vinylidene fluoride are used. These have excellent heat resistance, chemical resistance, and abrasion resistance.
However, depending on the resin composition and degree of polymerization, solutionizing the inactive resins into paints is difficult, therefore, paints are made in dispersed form or water based emulsions.

The heat resistance temperatures of the dispersion paints are: Tetrafluoroethylene resin (PTFE) 260°, Tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP) 200°, Polychlorotrifluoroethylene resin (PCTFE) 180°, Polyvinyl fluoride (PVF) 150°, and etc.
Heat resistance of powder paints are: Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin (PFA) 260°, Tetrafluoroethylene-hexafluoropropylene copolymer resin (FEP) 200°, Ethylene chloride trifluoride ethylene copolymer resin (ECTFE) 150°, Tetrafluoroethylene-ethylene copolymer resin (ETFE) 150°, and etc.

Since they are expensive, the uses are limited to applications especially requiring heat resistance and abrasion resistance, such as on special high-quality surface-treated steel sheets, heat resistant machine parts, kitchenware such as frying pans, pots, and kettles.