摘要
合成了改性苯并恶嗪树脂,用其代替酚醛树脂制备铸造用覆膜砂,优化树脂合成和混砂条件,并筛选了六种固化剂。结果表明:苯并恶嗪树脂的最佳改性工艺为添加3%的水杨酸和4%的3-氨基丙基三乙氧基硅烷,ZnCl2为最佳固化剂;改性后树脂聚合速度是56 s;覆膜砂在230℃下固化4 min时覆膜砂性能最好,其中热态抗拉强度达到0.45 MPa,常温抗拉强度达到1.85 MPa,强度与酚醛树脂混制的覆膜砂相当,且烟小味小。
Modified benzoxazine resin was synthesized and used instead of phenolic resin to prepare precoated sand for casting.The conditions of resin synthesis and sand mixing for industrial production were optimized.Six curing agents were screened.The results show that the optimum modification process of benzoxazine resin is the addition of 3%benzoic acid and 4%3-aminopropyl triethoxysilane,and optimal curing agent is ZnCl2;the polymerization rate of the modified benzoxazine resin is 56 s.When the coated sand is cured at 230℃for 4 min,the coated sand has the best performance,in which the thermal tensile strength reaches 0.45 MPa,the normal temperature tensile strength reaches 1.85 MPa,which are equivalent to those of ordinary precoated sand.Additionally,smoke and smell are less than phenolic resin.
作者
刘朝政
张娟
郭畅畅
卞宇航
单清雯
LIU Chao-zheng;ZHANG Juan;GUO Chang-chang;BIAN Yu-hang;SHAN Qing-wen(College of Chemistry and Pharmaceutical Engineering,Hebei University of Science and Technology,Shijiazhuang 050018,Hebei,China)
出处
《铸造》
CAS
北大核心
2020年第5期480-484,共5页
Foundry
基金
国家自然科学基金项目(21106032)
河北省教育厅项目(ZD2016064,2017102002381)。
关键词
苯并恶嗪
改性
覆膜砂
固化剂
benzoxazine
modification
precoated sand
hardener
