The relationship between viscosity and temperature of hydroxypropyl methylcellulose HPMC
The viscosity of hydroxypropyl methylcellulose HPMC is inversely proportional to temperature, that is, the viscosity increases as the temperature decreases. We usually say the viscosity of hydroxypropyl methyl cellulose HPMC, which refers to the result of testing hydroxypropyl methyl cellulose HPMC at a temperature of 20 degrees Celsius in a 2% aqueous solution.
In practical applications, in areas with large temperature difference between summer and winter, it should be noted that it is recommended to use a relatively low viscosity in winter, which is beneficial to construction. Otherwise, when the temperature is low, the viscosity of hydroxypropyl methylcellulose HPMC will increase, and the hand will feel heavy when scraping.
Viscosity in HPMC: 75000-100000 Mainly used for putty powder
Reason: moderate viscosity, good water retention
Hydroxypropyl methylcellulose HPMC high viscosity: 150000-200000 Mainly used for thermal insulation mortar, ordinary mortar, special mortar, tile adhesive, etc.
Reason: The viscosity is high, the mortar is not easy to sag, and the construction is improved.
But in general, the higher the viscosity, the better the water retention, so the general dry powder mortar uses high viscosity hydroxypropyl methyl cellulose HPMC