The role of hydroxypropyl methyl cellulose in cement mortar hpmc

First, the principle of hydroxypropyl methyl cellulose

Hydroxypropyl methyl cellulose is a natural cellulose derivative with high molecular weight, which is easily dispersed in water and can form a viscous liquid. Its molecular chain is rich in hydroxyl and methyl groups, which can react with water molecules in the cement slurry or other added chemicals to form a large number of hydrogen bonds or physical adsorption, so as to achieve the following roles.

Second, the role of hydroxypropyl methyl cellulose in cement mortar

1. Increase viscosity: hydroxypropyl methyl cellulose can form a viscous liquid in water. When added to cement mortar, it can increase the viscosity of mortar, reduce the dispersion of mortar, and make it easier for mortar to adhere to the wall or the ground.

2. Improve fluidity: Because hydroxypropyl methyl cellulose has good viscosity and fluidity, it can improve the fluidity of cement slurry, making the mortar easier to construct and lay, reducing the difficulty and time of construction.

3. Improve strength: Because the molecular chain of hydroxypropyl methyl cellulose has strong durability and toughness, it can form a network structure in cement mortar, thereby increasing the tensile strength, compressive strength and impact resistance of cement mortar.

4. Prevent cracking: Because hydroxypropyl methyl cellulose can increase the toughness and ductility of mortar, it can prevent cracks and cracks in the drying and shrinking process of cement mortar, and improve the smoothness and beauty of the mortar surface.

5. Improve durability: Because hydroxypropyl methyl cellulose can inhibit the breaking and falling off of cement particles, reduce the gaps and internal defects in the cement slurry, thereby improving the compactness and durability of cement mortar.