Effect of hydroxypropyl methylcellulose HPMC on the solubility of cement-based materials

Hydroxypropyl methyl cellulose on cement-based material solubility First. The solubility of hydroxypropyl methylcellulose in water is actually oxidiz propylene (methoxy ring) modified methyl cellulose. It still has a cold water and hot water solubility similar characteristics of insoluble alkali cellulose. However, due to modified hydroxypropylated cellulose, methyl cellulose it is significantly higher than in hot water. For example, the viscosity of hydroxypropyl methyl cellulose DS=0.732% aqueous solution and hydroxypropyl content =46 is the product 500MPa degree MSS at 20C, the gel temperature can reach nearly 100C. The same temperature as methyl cellulose, only about 55C. As dissolved in water, for example, the hydroxypropyl methylcellulose at the press (20C, the viscosity of the 4% aqueous solution 2PAS0.2 to 0.5mm) of the particles was also improve significantly.

Second, has a better solubility in organic solvents than in methylcellulose. Hydroxy substitution greater than or equal to 2.1, HPMS of 1.51.8, DS methoxy group =0.21.0.Total substitution of 1.8 or more is anhydrous methanol and ethanol solution, thermoplastic, water soluble, can also be dissolve in dichloromethane, chloroform and acetone, organic solvents, isopanol and diacetone alcohol in organic solvent solubility than in water.

The influence of on mortar setting time was evaluate, and the water ash ratio and mortar ratio were determine.

With the same amount of. In the water determination, the initial condensation delay of the-mixed mortar was 6. HPMC is a polymer, a straight-chain macromolecular structure with hydroxyl groups that form hydrogen molecules mixed with the water molecules. Thereby increasing the viscosity of the mixed water. The long molecular chains attract each other, thus allowing the interrow-scanning molecules to form network structures, cement, and mix water wrapped up.


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