| 摘要 |
<p>Glass fibres are treated with an aqueous solution of a hydrolysed vinyl or allyl silane having a pH between 4.5 and 7.5 and the solution is dried on the fibres while maintaining the fibres substantially free from circulating air currents. The silane may be diallyl diethoxysilane, vinyl trichlorosilane, soluble salts of vinyl and allyl siloxanols, or vinyl triethoxysilane. The silane may be added to an aqueous solution of formic acid and may be applied to the glass cloth at a pH of 4.5 to 5.5. During the impregnation the pH may rise to 7.5, and may be adjusted with formic acid. The impregnated fabric may be reeled upon a perforated mandrel and dried in an oven at 250 DEG F. for 18 hours. Circulation of the air in the oven during the drying period is the minimum amount necessary to remove evaporated moisture. The treated material may be used in the production of laminates using unsaturated polyester resins. Specification 745,374 is referred to.</p> |
