Effect of hydroxypropyl methylcellulose on dry mixed ready mixed mortar

The water retention performance is a reuse index to measure the water retention performance of hydroxypropyl methylcellulose. The good and poor water retention performance is also concerned by many domestic dry powder mortar manufacturers, especially those in the high-temperature climate area in the south. At the same time, there are many reasons affecting the water retention effect of dry powder mortar, such as addition amount, viscosity, particle fineness, environment and temperature.

In the process of dry mixing ready mixed mortar, the addition amount of hydroxypropyl methylcellulose is low. Although the addition amount is low, it can significantly improve the performance of wet mortar, which is also a main additive affecting the construction performance of mortar. Therefore, the scientific and reasonable selection of cellulose ether with different brands, different viscosities, different particle fineness and addition amount has a great impact on the improvement of the performance of dry mixed ready mixed mortar.

For the current building environment, the water retention performance of many masonry and plastering mortars is not ideal. Water slurry separation will occur after standing for a few minutes. Water retention is a main role of hydroxypropyl methyl cellulose ether. Water soluble cellulose ether plays an important role in ready mixed mortar. Its main functions are three surfaces. First, Better water retention performance, second, the influence on the consistency and thixotropy of ready mixed mortar, and third, the interaction with cement. The water retention performance of hydroxypropyl methylcellulose mainly depends on the water absorption of the base, the composition of mortar, the thickness of mortar layer, the water demand of mortar and the setting time of setting material. For the self water retention of cellulose ether, it mainly comes from the natural dissolution and dehydration of cellulose ether.

In the process of dry mixing ready mixed mortar, hydroxypropyl methylcellulose plays an important role, which can hold water, thicken, delay cement hydration power, and improve construction performance. Good water retention performance can make cement hydration more comprehensive, improve the wet viscosity of wet mortar, improve the bonding strength of mortar, and adjust the time at the same time. Adding hydroxypropyl methylcellulose ether in the process of dry mixing ready mixed mortar can improve the construction performance and structural strength of mortar, so it has been widely used in the field of mortar.