Three Surface Chemical Modification Methods of Aluminum Oxide Powder

Aluminum oxide powder is easily affected by external factors during use, which can affect the performance of the product. In order to maintain the performance of the product, some measures and methods need to be taken to control it. Next, alumina manufacturer Yangzhou Zhongtianli will introduce three surface chemical modification methods for alumina.

The surface of nano alumina powder contains some residual hydroxyl groups and residual charges. By utilizing this property, modifiers can be selected for chemical reactions, changing the surface structure and state, and achieving the goal of surface modification.

1. Grafting method

The surface of nano alumina micropowder contains active hydroxyl groups, which serve as the active point for grafting reaction. Oil soluble groups are grafted, and the grafted product is generally small molecules. Essentially, coupling treatment is also equivalent to grafting. The advantage of this method is that the amount of grafting can be controlled and the efficiency is high. Common grafting small molecules include stearic acid, 4,4-diphenylmethane diisocyanate, methyl-2,4-diisocyanate, etc.

2. Coupling agent method

Nano powder particles have high surface energy and poor affinity with organic systems with low surface energy. When the two blend, it is easy to form phase separation. The solution is usually through coupling technology. Coupling agents are generally compounds with bifunctional groups that can react with both inorganic and organic substances. When treated with coupling agents, one end binds to the surface hydroxyl group and the other end interacts with the dispersion medium.

3. Graft coating method

The grafting coating method first forms a layer of organic compounds (mostly small molecules) on the surface of nano alumina micropowders through grafting or coupling technology, and then uses initiators to graft and polymerize the monomers onto the organic layer on the particle surface, forming an inorganic organic "core shell" structure with micropowder as the core and polymerization layer as the shell. The advantage of grafting coating method is that the shell thickness can be controlled by the amount of organic matter added.

The above is the relevant content about alumina organized by alumina manufacturer Yangzhou Zhongtianli, hoping to provide some help to everyone. If you would like to learn more about alumina, please feel free to contact us. Yangzhou Zhongtianli New Materials Co., Ltd. is a technology enterprise specializing in the production of isopropanol aluminum, isopropanol aluminum trimer, secondary butanol aluminum, pseudo boehmite, high-purity arsenic, high-purity aluminum oxide, etc. It has multiple technologies and has received unanimous praise in the industry.