根据发泡剂发气过程原理的不同，可以分为物理发泡和化学发泡两大类。
According to different principles of gas process, it can be divided into physical foaming and chemical foaming.
结果表明，对原砂进行表面处理可以提高粘结剂的粘结效率，提高覆膜砂的强度，减少树脂加入量，降低发气量。
The results have shown that the precoated sands with low resin content, high strength, and low gas evoluti…
应用推荐