CAJ | 학술논문

研究了微米级Al2O3水相体系分散特性,主要考察分散剂种类、分散剂用量、体系pH值、分散方式等对Al2O3水相体系分散性的影响,采用吸光度和粒度分析仪表征分散效果.由实验可以得出结论:当p H在7~10范围时,Al2O3水相颗粒表面的正负电荷相当,基本不带电,静电斥力最弱,范德华引力最强,颗粒呈现团聚倾向.分散剂APAAA的加入,在颗粒表面形成保护膜,改变了Al2O3水相体系的等电点,产生空间位阻和静电稳定效应提高分散性.超声波通过局部空化作用弱化粉体颗粒间的作用能,分散的效果比机械高剪切作用的效果要好.
연구료미미급Al2O3수상체계분산특성,주요고찰분산제충류、분산제용량、체계pH치、분산방식등대Al2O3수상체계분산성적영향,채용흡광도화립도분석의표정분산효과.유실험가이득출결론:당p H재7~10범위시,Al2O3수상과립표면적정부전하상당,기본불대전,정전척력최약,범덕화인력최강,과립정현단취경향.분산제APAAA적가입,재과립표면형성보호막,개변료Al2O3수상체계적등전점,산생공간위조화정전은정효응제고분산성.초성파통과국부공화작용약화분체과립간적작용능,분산적효과비궤계고전절작용적효과요호.
The dispersion characteristics of micron grade Al2O3 particle in water phase system was investigated through dispersant type, dispersant dosage, system pH value and dispersion methods. The dispersion effect was characterized by the absorbance and particle size analyzer. It was concluded that when the pH range from 7 to 10, the positive charge and negative charge are comparative, and Al2O3 particle in water phase is electrically neutral, with the electrostatic repulsion force showing the most weak, and Van der Waals force, the most powerful, so the particle tends to reunion tendency. The adding of dispersant APAAA, which formed a layer of protective film on the particle surface, changes the isoelectric point of Al2O3 water phase system, produces the steric hindrance and static stability effect to improve the dispersion. The ultrasonic weakens the role of powder between the particles due to the local cavitation, having the better dispersion effect than mechanical high shear action.