How to choose the process of nano coating disperser?

与三辊，球磨机和砂磨机相比，高剪切分散机具有效高，能耗低等显着优势，是分散工艺的可选。

高剪切分散机是在高速旋转的转子产生的离心力作用下，物料从工作头的上下进料区，同时从轴向吸入工作腔。强劲的离心力将物料从径向甩入定、转子之间狭窄精密的间隙中，同时受到离心挤压、液层摩擦、液力撞击等综合作用力，物料被初步分散。

高剪切分散机工作原理及其在纳米涂料生产工艺中应用纳米涂料作为目前一种新型的环保涂料，已引起涂料行业的高度重视，成为装饰行业新时尚。纳米涂料主要是通过在涂料中添加纳米氧化物来改变传统涂料的特性和不足之处。如在水性体系的建筑涂料原配方基础之上，添加总重量份的3‰左右的纳米氧化硅，其干燥时间由原来的2小时缩短到小于1小时；耐洗刷性能由1000次(外墙涂料)和100次(内墙涂料)提高到10000次以上；人工加速老化试验由240小时的一级变色、二级粉化提高到450小时无任何变化，650小时发生轻微变色，色差4.8。此外，由于纳米材料奇异的理、化特性，使得改性涂料一些无须测试的技术指标诸如涂层与基体之间的接合强度、涂膜的表面硬度、涂膜的自洁能力等也获得了显著提高。其应用功效主要取决于纳米粉体材料在基体材料中的分散度。

分散的必要性

众所周知纳米氧化物极易产生自身的团聚，使得应有的性能难以充分发挥。此外，纳米氧化物的诸多奇异性能能否得到充分发挥，还取决于尽可能降低粉体与介质间的表面张力。因此，纳米氧化物粉体需要均匀分散，充分打开其团聚体，才能发挥其应有的奇异性能。

分散方式

涂料中粉体(含纳米材料)的分散主要是靠剪切力的作用。纳米材料在涂料体系中的分散，一般是采用下述分散方法来达到分散效果。

Grinding and dispersing: Using the difference in speed between the rollers of the three-roller or multi-roller machine, the abrasive is put into the feeding groove between the feeding roller (rear roller) and the middle roller, and the two rollers rotate inward at different speeds, and part of the abrasive enters The feeding gap is subjected to a strong shearing action. Through the feeding gap, the grinding material is divided into two parts, one part is attached to the feeding roller and returned to the feeding groove, and the other part is brought by the middle roller to the scraping paint between the middle roller and the front roller. seam, where it is again subjected to a stronger shear force. After passing through the paint scraping gap, the abrasive is divided into two parts, one part is brought to the scraper by the front roller, falls into the paint scraping plate, and the other part returns to the feeding ditch, so after several cycles, the purpose of dispersion can be achieved. However, processing with a three-roll machine or a multi-roll machine has low efficiency and high energy consumption, which cannot meet the needs of mass production.

Ball mill dispersion : Through the mutual rolling and collision between the balls in the ball mill and between the balls and the cylinder, the powder particles in contact with the steel balls are crushed or ground, and the mixture is subjected to highly turbulent mixing in the gaps of the balls. function and be evenly dispersed.

Sand milling dispersion : sand milling is the extension of ball milling. It's just that the grinding medium is made of fine beads or sand. The sand mill can feed continuously. When the premixed slurry of nano powder passes through the cylinder, it is subjected to violent impact and shearing action from the vigorously stirred sand in the cylinder, so that the nano oxide can be well dispersed in the coating. , the dispersed slurry leaves the sand grinding area and passes through the outlet sieve, and overflows to discharge, the outlet sieve can block the sand and make it return to the cylinder. Dispersion by ball mills and sand mills can achieve better dispersion effect and material fineness, but ball mills and sand mills also cannot avoid the disadvantages of low processing efficiency and high energy consumption.

High-shear disperser : The core component of the high-shear disperser is the stator/rotor structure. The high tangential velocity and high-frequency mechanical effect generated by the high-speed rotation of the rotor bring strong kinetic energy, so that the material is in the narrow gap between the stator and the rotor. Under the combined effects of strong mechanical shear, hydraulic shear, centrifugal extrusion, liquid layer friction, impact tearing and turbulence, the immiscible solid, liquid and gas phases are instantly Disperse evenly and finely, and after high-frequency cycles, finally get stable high-quality products.