Views: 0 Author: Site Editor Publish Time: 2025-06-23 Origin: Site
Today we will mainly talk about the importance of the fineness of HPMC for gypsum plaster mortar, dry mortar, and spray mortar.
The hydroxypropyl methylcellulose used in gypsum plaster mortar is required to be powder-----low water content, and the fineness also requires 20%~60% of the particle size to be less than 63μm. The fineness will affect the solubility of hydroxypropyl methylcellulose ether. Coarser hydroxypropyl methylcellulose should not be used in dry mortar.
Only sufficiently fine powder can avoid the agglomeration of hydroxypropyl methylcellulose ether when adding water and stirring. When hydroxypropyl methylcellulose is dissolved and agglomerated by adding water, it is difficult to disperse and dissolve Spray mortar requires mechanical construction. Due to the short mixing time, the fineness requirement is higher.
Therefore, pay attention when choosing the fineness of mortar! The fineness of hydroxypropyl methylcellulose also affects its water retention. Generally speaking, for hydroxypropyl methylcellulose ethers with the same viscosity but different fineness, the finer the fineness, the better the water retention effect when the same addition amount is used.
