The effect of HPMC on the construction material cement mortar

1. Excellent Water Retention

This is one of the most important roles of hydroxypropyl methylcellulose. Hydroxypropyl methylcellulose for construction prevents water from penetrating into the wall. The right amount of water left in the mortar helps to make the concrete have a longer hydration time, which effectively adjusts the operation time and improves the bond strength of the mortar, and can effectively prevent the occurrence of strength loss and cracking caused by too fast drying and insufficient hydration, especially in the construction of thin layers of sunny surfaces in hot and dry areas during the high temperature season with the addition of cellulose ether. Its methoxy and hydroxypropyl groups are evenly distributed along the cellulose molecular chain, which can improve the oxygen atoms on the hydroxyl and ether Jian, and the ability to join and form hydrogen bonds with water, so that free water becomes bonded water, thus effectively controlling the evaporation of water caused by high temperature weather and playing a very good water-retaining role. The water-holding capacity is directly proportional to the viscosity of the cellulose ether solution in mortar, the higher the viscosity, the better the water-holding capacity; once the water molecules increase, the water-retaining capacity will decrease. This is because the same amount of hydroxypropyl methyl cellulose solution for construction, the increase of water means the decrease of viscosity. The increase of water holding capacity will lead to longer maintenance time of mortar in construction.

2.Lubricating Ability

All air-entraining agents act as wetting agents because they reduce surface tension when mixed with water, which in turn helps disperse the fines in the mortar. Cellulose can be effectively suspended to make the mortar uniform and keep the top and bottom, which improves the lubricity and plasticity. Adding cellulose ether in mechanical spray mortar improves the fluidity and structural strength, improves the construction

performance and improve working efficiency, cellulose ether is widely used as an important additive in gypsum mortar!

3. Improve Workability

The application of hydroxypropyl methylcellulose improves the workability of the mortar. It is easy to dry mix the ingredients, does not produce agglomerates, improves

construction efficiency, improved construction performance, saving working time and reducing working cost.

4. Bubble Content

High air bubble content leads to better mortar yield and compatibility, and reduces crack formation. At the same time, the strength value is reduced and "liquefaction" occurs. The bubble content usually depends on the mixing time. Hydroxypropyl methylcellulose products are widely used to improve the performance of cement, gypsum and other water-hardened building materials. In cement-based mortars, it can improve water retention capacity, prolong correction time and open time, and reduce sagging phenomenon.

5. Significant Thickening Effect

Another role of hydroxypropyl methylcellulose. A good anti-sag mortar means no risk of sagging or downward flow in thick layers. The sagging resistance can be improved by building-specific hydroxypropyl methylcellulose, especially the newly developed building-specific hydroxypropyl methylcellulose, which can provide better sagging resistance to the mortar.

6. Excellent Fluidity

HPMC can ensure the fluidity of self-leveling mortar, improve the self-healing ability of self-leveling mortar and the adhesion and cohesion of self-leveling mortar to the substrate. It also helps to form a smooth surface, reduce shrinkage and improve load-bearing capacity.

In Mortar, HPMC plays three roles: thickening, water retention, and construction. HPMC does not participate in any chemical reaction and only plays an auxiliary role. HPMC in putty powder has three roles: thickening, suspension, uniformity of solution and anti-sagging, water retention, slow drying of putty powder and the reaction of calcium ash with water. Construction: Cellulose has a lubricating effect, which allows the putty powder to have good construction.

Need high-quality hpmc in putty powder? contact hpmc experts now!