Photocurable prepreg sheet for waterproofing, method and apparatus for production of prepreg sheet, and waterproofing method using the sheet

摘要

A photocurable prepreg sheet for waterproofing includes(1) a fiber-reinforced resin layer which comprises a sheet-shaped inorganic or organic fibrous reinforcing material impregnated with a resin composition comprising:(A) an unsaturated polyester resin and/or vinyl ester resin:100 parts by weight, and(B) at least two photopolymerization initiators having photosensitivity in different wavelength ranges from ultraviolet range to near infrared range:0.01 to 10 parts by weight,and which is treated with light of a specific wavelength to thereby undergo prepolymerization which causes at least one of the polymerization initiators and radical-polymerizable unsaturated groups to remain partially intact; and(2) film which covers an upper surface and a back surface of the fiber-reinforced resin layer. The waterproofing material does not require resin impregnation work, can be installed within a short time with successful resin setting, is free form the risk and cumbersome procedure which are caused when a peroxide catalyst is directly handled, and permits adjustment of the pot life. Also disclosed are method and apparatus for production of the prepreg sheet, and waterproofing method using the sheet.