Hydroxypropyl methyl cellulose ether plays an important role in dry mortar, mortar of cellulose ether dissolved in water. Due to the surface activity to ensure the effective uniform distribution of adhesive materials in the system. And hydroxypropyl methyl cellulose ether as a protective gel, “wrapped” solid particles, and form a lubricating film on its outer surface, make the mortar system more stable. Also improve the mortar in the mixing process and the construction smoothness.HPMC
Cellolose ether is one of the most commonly used additives in dry mortar.
Due to the characteristics of its own molecular structure, the water in mortar is not easy to lose. And gradually released in a long period of time, giving mortar good water retention and working ability. Water retention of hydroxypropyl methyl cellulose ether is the most important and basic indicator. And water retention the amount of by the newly mix mortar on the absorbent base after capillary substrate. Cellolose ether water retention testing countries has no relevant detection methods. Production enterprises usually does not provide technical parameters, which brings inconvenience to the user use and evaluation. We according to years of experience in dry mortar, referring to other product test methods, summarizes the following several cellulose ether water retention testing methods, for discussion.HPMC
Filter paper method is to judge the water retention of cellulose ether by the water absorption of the filter paper. It is compose of metal ring test mold of a certain height, filter paper and glass tray. Under the test mold are 6 layers of filter paper, among which the first layer is fast filter paper, and the other 5 layers are slow filter paper. Measure the weight of the tray and 5 layers of slow filter paper with a precision balance, pour the mortar into the test mold and scrape it flat for 15min; then weigh the weight of the tray and 5 layers of slow filter paper.HPMC