The paints we have discussed so far are generally used to protect the painted objects from environments, and to increase the subjects' values with improved appearances by applying colors and luster. However, in recent years, paints that have specific functionalities such as heat resistance, electrical conductivity, lubricating, antibacterial, and deodorizing have come to usage. Some of such paints are introduced in this volume.

Heat resistant paint

For heaters and cooking appliances that are used at high temperatures, in addition for the paint coating layer to have heat resistance, prevention of the base materials to be oxidized or burned is also desired. The heat resistant paints are shown in [Table 1]. They can be classified into organic, inorganic types, and combination of both types. The mainstream of heat resistant paints are of silicone resin types and fluorine resin types. Characteristics of these are explained. Types and characteristics are shown in [Table 2].

[Table 1] Heat resistant paint types Organic heat resistant paints Silicone resin type, fluorine resin type, aromatic resin type, imide resin type Inorganic heat resistant paints Alkali silicate type, colloidal silica type, acidic metal phosphate type, bichromic acid type, enamel type Organic・Inorganic heat resistant paints Alkyl silicate type, alkyl titanate type, boron siloxane type

[Table 2] Types and characteristics of silicone resin heat resistant paints

Fluorine resin paint types and the heat resistance are shown in [Table 3]. Fluorine resin paints have poor adhesive property, and sufficient pre-processing is required.

[Table 3] Types and heat resistant temperatures (℃) of fluorine resin paint Paint form Resins and heat resistant temp. (℃) Dispersion paints PTFE tetrafluoroethylene(260), FEP ethylenetetrafluoride-propylenehexafluoride copolymer (200), PCTFE trifluoride ethylene chloride (180), PVF polyvinyl fluoride (150) Powder paints Tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer PFA (260), PVdF vinylidene fluoride (150), Tetrafluoroethylene-ethylene copolymer ETFE (150), ECTFE ethylene- chloride trifluoride ethylene copolymer resin (150)