- July 27, 2021
- Posted by: admin
- Category: News
The amount of hydroxypropyl methyl cellulose ether added in the dry-mixed mortar is very low, but it can improve the performance of the wet mortar and is a major additive that affects the construction performance of the mortar. Reasonable selection of cellulose ethers of different varieties, different viscosities, different particle sizes, different degrees of viscosity and added amount will produce and exert an influence on the improvement of the performance of dry mortar. At present, many masonry and plastering mortars have poor water retention properties, and water slurry separation occurs after a few minutes of standing still. Water retention is an important performance of methyl cellulose ether, and it is also a performance that many domestic dry mortar manufacturers, especially those in areas with higher temperatures in the south, pay attention to. The factors that affect the water retention effect of dry powder mortar include the amount of cellulose ether HPMC added, the viscosity of cellulose ether HPMC, the fineness of particles and the temperature of the environment in which it is used. Cellulose ether is a synthetic high molecular polymer made from natural cellulose through chemical modification.
The important role of water-soluble cellulose ether in mortar is mainly in three aspects. One is excellent water retention capacity, the other is the influence on the consistency and thixotropy of mortar, and the third is the interaction with cement. The water retention effect of cellulose ether depends on the water absorption of the base layer, the composition of the mortar, the layer thickness of the mortar, the water demand of the mortar, and the setting time of the coagulating material. The water retention of the cellulose ether itself comes from the solubility and dehydration of the cellulose ether itself.
In summary, in dry-mixed ready-mixed mortar, hydroxypropyl methyl cellulose ether plays a role in water retention, thickening, delaying the hydration power of cement, and improving construction performance. The good water retention capacity makes the cement hydration more complete, can improve the wet tackiness of the wet mortar, increase the bonding strength of the mortar, and the time can be adjusted. Adding hydroxypropyl methyl cellulose ether to dry-mixed mortar can improve the construction performance and structural strength of the mortar. Therefore, cellulose ether is being widely used as an important additive in dry-mixed mortar.