In ready-mixed mortar, as little as cellulose ether can significantly improve the performance of wet mortar. It can be seen that cellulose ether is a major additive that affects the construction performance of mortar.

Choose different varieties, different viscosities, and different particle sizes. Different degrees of viscosity and addition of cellulose ether also have different effects on the improvement of the performance of dry powder mortar. At present, many masonry and plastering mortars have poor water retention performance, and the water slurry will separate after a few minutes of standing. So it is very important to add cellulose ether in cement mortar.

What are the functions of cellulose ether in cement mortar?

1.Cellulose ether – water retention

Water retention is an important property of methyl cellulose ether. It is also the performance that many dry powder mortar manufacturers, especially those in areas with higher temperatures, pay attention to. In the production of building materials, especially dry powder mortar, cellulose ether plays an irreplaceable role. Especially in the production of special mortar (modified mortar), it is an indispensable and important part.

The viscosity, dosage, ambient temperature and molecular structure of cellulose ether have a great influence on its water retention performance. Under the same conditions, the greater the viscosity of cellulose ether, the better the water retention. The higher the dosage, the better the water retention. Usually a small amount of cellulose ether can greatly improve the water retention rate of mortar. When the dosage reaches a certain level, the water retention rate increases slowly.
As the ambient temperature rises, the water retention of cellulose ether usually decreases. However, some modified cellulose ethers also have good water retention under high temperature conditions. Cellulose ethers with a lower degree of substitution have better water retention properties.
cellulose ether in cement mortar
The hydroxyl groups on the cellulose ether molecules and the oxygen atoms on the ether bonds will associate with water molecules to form hydrogen bonds. Make free water into bound water, so as to play a very good role in water retention. The interdiffusion between water molecules and cellulose ether molecular chains allows water molecules to enter the interior of the cellulose ether macromolecular chains and is subject to strong binding forces. Thereby forming free water, entangled water, and improving the water retention of cement slurry.
Cellulose ethers improve the rheological properties, porous network structure and osmotic pressure of fresh cement paste. The film-forming properties of cellulose ether hinder the diffusion of water.
The role of cellulose ether in cement mortar (2)
The role of cellulose ether in cement mortar (3)