HPMC(Hydroxypropyl MethylCellulose)In building materials, hydroxypropyl methyl cellulose can act as dispersing agents, thickeners and binders, and HPMC is mainly used in the molding of cement mortar and plaster products. With cement mortar, HPMC will increase adhesion, reduce flocculation, improve viscosity, shrinkage, and water retention, reduce the water loss of concrete surface, enhance the strength, and prevent the occurrence of cracks or weathering effects from water-soluble salts.
Hydroxypropyl methylcellulose is a white powdery substance, soluble in cold water and hot water, and many polar solvents and a small proportion of ethanol and water, dimethyl methanol and water, dichloroethane, etc., in ether, acetone , Insoluble in absolute ethanol, swelling in cold water to clear or slightly turbid compound reagent. Hydroxypropyl methylcellulose has the properties of thermal gelation. The product aqueous solution completes gel precipitation after heating and dissolves after cooling. For products of different specifications, the gelatinization temperature difference is different. The solubility changes with the shearing force. The lower the viscosity, the greater the solubility. The properties of the different standard hydroxypropyl methylcellulose are slightly different. The solubility of HPMC in water is not affected by the pH value.
| ITEM |
RANGE |
| Hydroxypropyl content |
7-12% |
| Methoxy content |
25-30% |
| Ash |
≤5% |
| Viscosity |
20,000-200,000mpa.s |
| PH |
5-8 |
| Purity |
99% |
| Gel temperature |
55-65ºC |
| Light transmittance |
≥80% |
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