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After dry-mixed mortar added with redispersible polymer powder is mixed with water, the modification of redispersible polymer powder on cement mortar is accomplished by redispersion of powder, hydration of cement and film formation of polymer.

HPMC are widely used in dry mix mortar products. The amount of cellulose ether, such as HPMC in dry mortar, added is very low, but it can significantly improve the performance of mortar and is an important additive that affects the construction performance of mortar. Cellulose ethers are rheology modifiers used to adjust the rheological properties of mortar.

Self-leveling mortar can rely on its weight to form a flat, smooth, and strong foundation on the substrate for laying or bonding other materials, and at the same time, it can carry out large-area and efficient construction. Therefore, high fluidity is a very significant feature of self-leveling mortar. Besides, it must have a certain degree of water retention and bonding strength, no segregation of water, and have the characteristics of insulation and low-temperature rise.

As a water-soluble polymer compound, also known as water-soluble resin or water-soluble polymer, Hydroxypropyl Methyl Cellulose（HPMC） is s a hydrophilic polymer material by increasing the viscosity of mixing water to increase the consistency of its mixture and can be dissolved in water to form a solution or dispersion.

1. Hydroxypropyl methyl cellulose can enhance the adhesion to the surface of the wall, enhance water-holding capacity, and thus improve the strength of mortar.

The redispersible powder is a special water-based emulsion made by spray drying and a polymer binder prepared mainly based on the vinyl acetate-ethylene copolymer. After partial evaporation of water, polymer particles form a layer of polymer film by agglomeration and play the role of adhesive

As a kind of basic additive in mortar formulation, it can provide good water retention, increased adhesion strength and improved workability. Wildly used in many kinds of dry mix mortar products.

In the use of hydroxypropyl methyl cellulose HPMC, we usually find that it is basically divided into two types: immediate and slow dissolution. Let us understand the difference between quick dissolution and slow dissolution of hydroxypropyl methyl cellulose.

1. The aqueous solution of pure hydroxypropyl methyl cellulose is clarified with high transmittance and the water retention rate of > 95%; Adulterated HPMC water solution is more than 80 %.