| 摘要 |
A method of making a calcium catalyzed thermosetting phenol formaldehyde resin suitable for modification for use in binder formulations, foams, and other uses. Aqueous binder formulations are prepared from such binder resins, particularly for use in bonding glass fiber articles. The method comprises the step of methylolating phenol with formaldehyde under alkaline conditions, in the presence of calcium oxide (calcia), or calcium hydroxide, and water as a solvent. The formaldehyde is introduced in high ratios of 2.8 to 4.5 moles per mole of phenol. A high level of calcium hydroxide is present, in an amount of 3 to 5.5% calcium based on weight of phenol. The methylolation reaction is terminated while the condensation reaction product is still water soluble. The condensation product may be reacted with a monomer or an amine type resin.
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