醇改性动物胶粘结剂及其改性机理  

Alcohol Modified Animal Glue Binder and Its Modification Mechanism

作　　者：任玉艳 王天舒 马家兴 刘伟华[3] 李英民[3] REN Yu-yan;WANG Tian-shu;MA Jia-xing;LIU Wei-hua;LI Ying-min(Weifang University of Science and Technology,Shouguang 262700,Shandong,China;Shandong Jiaotong University,Jinan 250023,Shandong,China;Shenyang University of Technology,Shenyang 110870,Liaoning,China)

机构地区：[1]潍坊科技学院,山东寿光262700 [2]山东交通学院,山东济南250023 [3]沈阳工业大学,辽宁沈阳110870

出　　处：《铸造》2022年第3期351-356,共6页Foundry

基　　金：国家自然科学基金(51275313);寿光市科技计划项目(2019JH14);潍坊市先进动力系统用热端材料及单晶部件制备重点实验室。

摘　　要：为改善动物胶常温下易凝胶且型砂强度低的问题,通过醇对动物胶粘结剂的酯化交联对其进行改性处理,使其成为铸造用粘结剂。试验结果表明,醇类改性剂改善了动物胶的凝胶状态且显著提高了其型砂抗压强度,其中无水乙醇和丙三醇改性效果较佳,丙三醇改性动物胶粘结剂型砂的抗压初强度达到了0.92 MPa,终强度达到了3.77 MPa。依据强度指标,确定了改性工艺中最佳改性温度为75℃,最佳改性时间为90 min。并通过红外光谱仪和型砂试样的断口断裂方式进一步分析了动物胶粘结剂因醇的改性而改善其性能的粘结机理,其改性机理主要是由于醇类中的羟基-OH与动物胶侧链的羧基-COOH发生了酯化交联反应,改善了粘结力。In order to solve the problem of animal glue binder of coacervation at room temperature easily and low compression strength,it needs to be modified by the method of esterification crosslinking using alcohol,and it will be foundry binder in application.The experimental results showed that the coacervation of the animal glue was made better by alcohol modifiers and its sand compressive strength was improved obviously.The effect of anhydrous ethanol and glycerol modification was better.The initial compressive strength achieved 0.92 MPa and the final strength reached 3.77 MPa in the glycerol modified animal glue binder molding sand.In addition,the strength of binder and bonding mechanism were analyzed by FT-IR and fracture of molding sand.Its mechanism is that an esterification reaction happens between the carboxyl(-COOH)of animal glue and the Hydroxy(-OH)of alcohol modifiers mainly,thereby improves the adhesion.

关 键 词：动物骨胶 铸造粘结剂 醇类改性剂 抗压强度 改性机理 

分 类 号：TG221.1[金属学及工艺—铸造]