新型磺化酮醛缩聚物改性呋喃树脂工艺研究  

Research on Novel Technology of Modified Furan Resin by Sulfonated Acetone-Formaldehyde Condensate

作　　者：黄仁和[1] HUANG Ren-he(College of Chemical and Biological Engineering,Shandong University of Science and Technology,Qingdao 266590,Shandong,China)

机构地区：[1]山东科技大学化学与生物工程学院,山东青岛266590

出　　处：《铸造》2023年第2期183-187,共5页Foundry

摘　　要：芳烃磺酸是自硬呋喃树脂最佳固化剂,也是目前应用最多固化剂种类之一,相对于高游离酸的固化剂,它更有利于提高呋喃树脂砂的后期强度和树脂砂型(芯)韧性。目前在呋喃树脂工艺改进中,更多是降低呋喃树脂的糠醇含量,从而达到降低呋喃树脂的生产成本目的。本文试图用磺化酮醛缩合物来改性呋喃树脂达到上述改进呋喃树脂与固化剂的双重目的。用磺化酮醛缩合物改性呋喃树脂,可以降低呋喃树脂的糠醇含量节约成本;同时在混砂过程中,固化剂中游离酸将该树脂中的磺化缩合物的磺酸基的盐变成磺酸基,相当于降低了固化剂中的游离酸含量,并改善了呋喃树脂砂芯和砂型的性能。文中对该磺化酮醛缩合物合成工艺条件与改性呋喃树脂的适应性方面进行研究,得出较佳的合成条件:有机酮F与醛摩尔比1∶4,磺化试剂S与有机酮F摩尔比为1∶0.3;该磺化酮醛缩合物较适用于中氮和低氮呋喃树脂的改性。Aromatic sulfonic acid is the best curing agent for self hardening furan resin and one of the most used curing agents at present.Compared with the curing agent with high free acid,it is more conducive to improve the later strength and toughness of the furan resin sand.At present,in the improvement process of the furan resin,it is more to reduce the furfuryl alcohol content of the furan resin,so as to reduce the production cost of the furan resin.This paper attempts to modify the furan resin with sulfonated acetone-formaldehyde condensate(SAC)to achieve the dual purpose of improving the furan resin and curing agent.The furfuryl alcohol content of the furan resin can be reduced and the cost can be saved by modifying the furan resin with sulfonated acetone-formaldehyde condensate(SAC).At the same time,in the mixing sand process,the free acid in the curing agent changed the sulfonic acid salt in the SAC into sulfonic acid group,which is equivalent to reducing the content of free acid in the curing agent and improving the properties of the furan resin sand core and sand mold.Based on synthesis conditions of the SAC and adaptability in the modified furan resin,it was concluded that a better synthesis condition is as follows:molar ratio of the acetone to formaldehydes was 1:4,molar ratio of the sulfonating agent to acetone was 1:0.3;SAC was more suitable to modify the medium-andlow-nitrogen content of the furan resin.

关 键 词：磺化酮醛缩合物 改性 呋喃树脂 固化剂 适宜性 

分 类 号：TG221[金属学及工艺—铸造]