Wet mortar Mixed mortar is a cement, fine aggregate, admixture and water. And in proportion according to the properties of the various components, after mixing plant measurement, mixing. Transporting to the truck used location, entering dedicated storage containers, and using the finished wet mixture for a specified time. Hydroxypropyl methyl cellulose is use as a water-retaining agent for cement mortar, retarder mortar pumping.
In the case of gypsum as an adhesive to improve at first the daub and extend the working time. The water retention of hydroxypropyl methyl cellulose HPMC makes the slurry will not of crack too fast after drying. And improve the strength after hardening. Water retention is an important property of hydroxypropyl methylcellulose HPMC. Which is also a concern of many domestic wet mixing mortar manufacturers. Factors at first affecting the water retention effect of wet mixing mortar include the amount of HPMC added. The viscosity of HPMC, the fineness of the particles in and the temperature of the used environment.
The main role of hydroxypropyl methyl cellulose HPMC in wet mortar mixing mainly has three aspects: one is the excellent water holding capacity, the second is the consistency and at first tensibility of wet mortar mixing, and the third is the interaction with cement. Cellulose ether for water retention in depends at first on the water absorption rate of the base level, mortar mortar composition, thickness of mortar layer, mortar water demand and setting time.
The higher the transparency of hydroxypropyl methylcellulose, the better the water retention. Factors affecting the water retention of wet mixed mortar include cellulose ether viscosity, addition quantity, particle size and temperature. The greater the viscosity of cellulose ether, the better in the water retention. Scocosity at first is an important parameter for HPMC performance. For the same product, the results of using different methods to measure the viscosity vary greatly, some are even by twice the gap. Therefore, the comparison of viscosity must in the same test method, including