改性水溶性高分子粘结剂的制备及性能的研究  

Synthesis and Properties of Modified Water Soluble Polymer Adhesive

作　　者：李英民[1] 王天舒[1] 刘伟华[1] 任玉艳[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,沈阳110870

出　　处：《机械工程学报》2016年第14期67-72,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(51275313)

摘　　要：动物胶粘结剂是水溶性天然高分子粘结材料,具有无毒无害、可降解等特性,但其也具有在常温下易凝聚、流动性差、型砂强度低等问题,针对这一问题需要对其进行改性处理。在碱解条件下,采用丙三醇、乙醇和糊精对动物胶进行改性处理。试验表明:在碱解过程中,水胶比为8∶5,Na OH加入量为动物胶质量的5%,在改性过程中,选择的改性剂最佳配比(质量比)为:动物胶∶丙三醇∶乙醇∶糊精=100∶10∶10∶10,改性温度为75℃、改性时间为90 min。测得其表面张力值为26.451m N/m、抗压强度达到3.30 MPa,最后通过红外光谱对改性机理进行理论分析,分析认为改性剂丙三醇、乙醇和糊精可与动物胶发生反应。结果证明丙三醇、乙醇和糊精复合改性剂可以降低动物胶表面张力,提高表面润湿性,最终使得砂型强度增大。Animal glue exhibits excellent properties that non- toxic and unharmful, easy to coacervation at room temperature, poor flowing ability and the low compression strength of sand mould, in order to solve the problem which need to be modified. On the condition of alkaline decomposition, glycerol and dextrin is used as modifier of animal glue. The experimental results are given as the graft copolymerization and esterification crosslinking of modifier of glycerol and dextrin onto the animal glue can be carried out. The best ratio of modifier which is got by experiment（mass ratio） is as follow∶Animal glue∶glycerol∶ethanol： dextrin=100∶10∶10∶10, and the optimal modification reaction should be performed at 75 ℃with a reaction time of 90 min.Then measured the modified animal glue binder, surface tension is 26.451 m N/m and the compressive strength reached 3.30 MPa, the mechanism of modification is analyzed by infrared spectrometer, it is considered that there are a reaction happened among the materials. The tests show that glycerol, ethanol and dextrin composite modifiers can reduce animal glue surface tension, improve the surface wettability, and increased compression strength.

关 键 词：动物骨胶 表面张力 抗压强度 改性剂 

分 类 号：TG221[金属学及工艺—铸造]