| 摘要 |
PURPOSE:To obtain glass cloth, good in permeation of a resin without causing a slip phenomenon even when a laminated sheet of the resultant prepreg is hot-pressed and suitable as a reinforcing material by applying colloidal silicic acid to the surface of the glass cloth and then subjecting the resultant glass cloth to opening treatment. CONSTITUTION:Glass cloth is subjected to heat cleaning, then immersed in an aqueous suspension of colloidal silicic acid, dried, subsequently treated with a silane coupling agent, dried and then subjected to opening treatment by, e.g. a vibrowasher. The treated cloth is excellent in resin impregnating properties and an epoxy resin varnish is applied thereto to provide sheets of prepreg. The obtained sheets of the prepreg are superposed to afford the objective glass cloth for reinforced materials suitable for producing a laminated sheet excellent in heat resistance without causing a slip phenomenon when hot-pressed. |
