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Process for preparing a resin resol, fenolica, modified, utilizavel as a binder to refratarios, and molds and male fundicao
Process for preparing a resin resol, fenolica, modified, utilizavel as a binder to refratarios, and molds and male fundicao
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机译:制备树脂甲阶酚醛树脂,改性甲酚醛树脂,再利用树脂作为氟树脂粘合剂的方法以及霉菌和雄性基甲
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摘要
A process for preparing modified phenolic resole resins providing improved binders for refractories and foundry cores and molds. The resins are prepared by treating a phenol with a molar excess of aldehyde in the presence of an alkaline catalyst followed by further reaction at a pH below 7 in the presence of a catalyst which promotes formation of ortho-ortho benzylic ether bridges between the phenolic nuclei.
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