Views:0 Author:Site Editor Publish Time: 2021-01-21 Origin:Site
In ready-mixed mortar, the added amount of HPMC is very low, but it can significantly improve the performance of the wet mortar and is a major additive that affects the workability of the mortar. Reasonable selection of HPMC with different varieties, different viscosities, different particle sizes, different degrees of viscosity and added amount will have a positive effect on the improvement of the performance of dry mortar. At present, many masonry and plastering mortars have poor water retention properties, and water slurry separation occurs after a few minutes of standing still. Water retention is an important performance of methyl cellulose ether, and it is also a performance that many domestic dry mortar manufacturers, especially those in areas with higher temperatures in the south, pay attention to. The factors that affect the water retention effect of dry mortar include the amount of MC added, the viscosity of MC, the fineness of particles and the temperature of the environment in which it is used. Landcel HPMC has a wide range of viscosity, from 300-75000 Mpa.S, widely used in all kinds of mortars.
Water retention of cellulose ether: in the production of building materials, especially dry mortar, cellulose ether plays an irreplaceable role, especially in the production of special mortar (modified mortar), it is an indispensable important part .
The important role of water-soluble cellulose ether in mortar is mainly in three aspects. One is excellent water retention capacity, the other is the influence on the consistency and thixotropy of mortar, and the third is the interaction with cement. The water retention effect of cellulose ether depends on the water absorption of the base layer, the composition of the mortar, the thickness of the mortar, the water demand of the mortar, and the setting time of the coagulation material. The water retention of cellulose ether itself comes from its solubility and dehydration. As we all know, although the cellulose molecular chain contains a large number of highly hydratable OH groups, it is not soluble in water itself. This is because the cellulose structure has a high degree of crystallinity.
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Hydroxypropyl methyl cellulose is divided into two kinds of ordinary hot soluble cold water instantly soluble. Hydroxypropyl methyl cellulose uses are 1, Gypsum series In the gypsum series of products, cellulose ethers are mainly used to retain water and increase smoothness. Together they play a cer