This method is mostly used to process glass fibers in industry. The specific process is that the alkoxysilane coupling agent is first dissolved in water and formulated into a 0.5% -2.0% solution. For poorly soluble silanes, 0.1% non-ionic surfactant can be added to water to prepare an aqueous emulsion, and then AcOH can be added to adjust the pH to 5.5. The glass fibers are then treated by spraying or dipping. After taking out, the product is cured at 110-120 for 20-30min.
Because the stability of the silane coupling agent aqueous solution varies greatly, for example, a simple alkylalkoxysilane aqueous solution can only be stable for a few hours, while an aminohydrocarbon silane aqueous solution can be stable for several weeks. As long-chain alkyl and arylsilane aqueous solutions are stable for only a few hours, ammonia amino silicon aqueous solutions are stable for several weeks. Due to the low solubility parameters of long-chain alkyl and silynes, this method cannot be used. When preparing an aqueous silane solution, deionized water is not required, but water containing fluoride ions cannot be used.