近几十年来,在高分子化合物的合成领域中获得了巨大的成就。人们对于高分子化合物的兴趣与日俱增。以合成树脂为基础的塑料,具有多种宝贵的工艺性能,因而已经广泛地用于国民经济的各个不同部门中。目前没有那一个工业部门不在使用合成的高分子化合物。在铸造生产中合成树脂粘结剂优于油类粘结剂之处是烘干时间较短,一般发气性小,又适合于高 In recent decades, great achievements have been made in the field of the synthesis of polymer compounds. People are increasingly interested in polymer compounds. Synthetic resin-based plastics, with a variety of valuable process properties, have been widely used in various sectors of the national economy. There is currently no single industrial sector that is not using synthetic polymers. In the casting production of synthetic resin binder is better than the oil binder is the drying time is short, the general gas little, but also suitable for high