ABSTRACT

Phenolic resins are in-organic polymers with properties that make them high-strength binders with great potential for modification. The base-catalyzed phenol-formaldehyde resins provide the desired hardness to the core avoiding sand slipping on the surface. A modified resol type phenolic resin is developed for this study with minimum ingredients to compare it with existing recipes in the literature. A batch of cores was prepared with the standard 1-inch cross-section briquettes (dog-bone) with modified resol and cured through hot-curing process. Hardness and ultimate tensile strength values of these cores were compared with previous data present in literature. The average hardness as well the tensile strength from modified resol was higher than the cores from previous hot coating resol recipes and the gas-set cores present in the literature. Furthermore, the surface roughness of the cores was examined through Atomic Force Microscopy (AFM), and the ten-point height (Rz) value was lower than existing recipes.

摘要

酚醛树脂是一种无机聚合物，其特性使其成为具有巨大改性潜力的高强度粘合剂。碱催化的酚醛树脂为芯提供所需的硬度，避免沙子在表面滑落。为这项研究开发了一种改性甲阶酚醛树脂，其成分最少，可与文献中的现有配方进行比较。使用具有改性甲阶酚醛树脂的标准 1 英寸横截面煤球（狗骨）制备一批芯，并通过热固化工艺固化。这些芯的硬度和极限抗拉强度值与文献中的先前数据进行了比较。改性甲阶酚醛树脂的平均硬度和抗拉强度高于先前热涂甲阶酚醛树脂配方的芯和文献中存在的气定型芯。