why use hpmc in mortar

 Hydroxypropyl methyl cellulose ether can introduce an appropriate amount of air bubbles, which can greatly improve the frost resistance of the mortar and increase the durability of the mortar. The high bubble content leads to better mortar yield and workability, and reduces the formation of cracks. At the same time, it also reduces the strength value, causing a “liquefaction” phenomenon. The bubble content usually depends on the mixing time. Products are widely used to improve the performance of hydraulic building materials, such as cement and gypsum. In cement-based mortar, it can improve water retention, extend correction time and open time, and reduce sagging.'Cellulose ether combines physical and chemical effects to retain water and thicken. It can produce substances that cause micro-swelling during the hydration process, so that the mortar has a certain micro-swelling performance and prevents the mortar from hydrating in the later stage. The cracking caused by shrinkage in the medium increases the service life of the building.