It is necessary to diffuse light reflection on the surface of the film, otherwise the effect of extinction is not good.

因此，消光粉尽量不要研磨，如果研磨或者高速长时间分散，会将消光粉的表面破坏，而且粒径也变太小了，这样的消光效果不理想。

Therefore, the polishing powder should not be rubbed as far as possible. If grinding or high-speed dispersing for a long time, it will destroy the surface of the matting powder and the particle size is too small, so the extinction effect is not ideal.

目前市场上的消光粉的粒径不会大于30微米，对于一般的面漆来说，已经足够了，消光粉一般不研磨的原因是消光粉自身的海绵状结构，过度研磨（或者分散）会破坏海绵状结构，形成光滑的切面，造成消光效率下降。

The extinction powder on the market size is not greater than 30 microns, the general paint is enough, because it is generally not grinding extinction powder sponge structure extinction powder itself, excessive grinding (or dispersion) will destroy the cavernous structure, form a smooth cutting surface, resulting in extinction efficiency decreased.

消光粉研磨的话，消光能力会有影响的，一般消光粉的粒径在5-20um，不会对表面产生影响，如果有影响的话，加入时的步骤（在搅拌时加入）和油漆的粘度可以适当低点，除非消光粉的分散能力差，否则分散15~30min就达到要求。

The extinction powder grinding, extinction ability will affect the general extinction powder particle size in 5-20um, will not have an impact on the surface, if anything, to join the steps (added in mixing) and paint viscosity can be low, unless the dispersing ability of extinction powder, or dispersion 15~30min to meet the requirements.

另外有时候在实验室分散细度可以达到要求，但是在实际生产就会出现细度问题，其主要原因分析是实验室剪切力高，而实际生产用的分散机，剪切力不够。

In addition, sometimes the dispersion fineness can meet the requirement in the laboratory, but the fineness problem will appear in actual production. The main reason is the high shear force in the laboratory, while the actual production dispersing machine is not enough shear force.