There are disclosed methods and compositions for retarding the room temperature gelation and eventual hardening of phenolic resole resins when such resins are mixed with lightburned magnesium oxide or magnesium hydroxide hardening agents with or without an ester functional hardening agent. Retardation of gelation and hardening is achieved by incorporating into said mixture a retarder compound such as one which decreases the solubility of magnesium in said mixture. Additionally, hardening at higher temperatures, thermal curing, coated abrasives, polymer concrete, and other methods and compositions of this invention are disclosed.
本发明公开了当
酚醛
树脂与轻烧
氧化镁或
氢氧化镁硬化剂(含或不含酯官能团硬化剂)混合时,延缓
酚醛
树脂室温凝胶化和最终硬化的方法和组合物。延缓凝胶化和硬化的方法是在上述混合物中加入延缓剂化合物,如能降低
镁在上述混合物中的溶解度的化合物。此外,还公开了本发明的高温硬化、热固化、涂层磨料、聚合物混凝土以及其他方法和组合物。