Method of producing a fluorescent material containing sealant

摘要

A fluorescent material-containing sealing resin (20) production method of the present invention includes: a kneading step of kneading a powder mixture (24), which has been obtained by mixing a powder of silicone resins (21) and a powder of fluorescent materials (22) together, while melting the powder mixture (24) by heat, so that a kneaded mixture (25) is obtained; and an extruding step of extruding the kneaded mixture (25) in a form of a cord from an output port (37b) of a twin screw extruder (37).

主权项

1. A method of producing a fluorescent material-containing sealant, comprising:
a mixing step of mixing (i) a powder of silicone resins which have been semi-cured by primary crosslinking and (ii) a powder of fluorescent materials, so that a powder mixture is obtained; a kneading step of kneading, by use of a kneading extruding device including at least one screw, the powder mixture while melting the powder mixture by heat at a temperature lower than a secondary crosslinking temperature, so that a kneaded mixture is obtained, the secondary crosslinking temperature being a temperature at which the silicone resins form secondary crosslinking; and an extruding step of extruding the kneaded mixture in a form of a cord from an output port of the kneading extruding device, which output port has at least one through hole, the silicone resins being configured to (i) reversibly change in viscosity in a temperature region between room temperature and the temperature lower than the secondary crosslinking temperature and (ii) be completely cured in a temperature region encompassing the secondary crosslinking temperature or higher.