The role of Hydroxypropyl Methyl Cellulose(HPMC) in mortar
HPMC mainly plays the role of water retention and thickening in cement mortar and gypsum-based plaster, which can effectively improve the cohesion and sag resistance of the mortar.
The water retention performance of Michem?hydroxypropyl methylcellulose (HPMC)has many advantages:
1). The excellent water retention performance makes the mortar open longer, and it has the advantages of large-area construction, long use time in the barrel, batch mixing and batch use.
2). Good water retention properties make the cement in the mortar fully hydrated and effectively improve the bonding performance of the mortar.
3). The mortar has excellent water retention properties, which makes the mortar difficult to segregate and bleeding. Now, the workability and workability of the mortar are improved.
And what factors affect the water retention of HPMC?
The water retention of?HPMC?is affected by the following factors:
1. uniformity
The uniformly reacted HPMC has uniform distribution of methoxy and hydroxypropoxy groups and high water retention.
2. Thermal gel temperature
The higher the thermal gel temperature, the higher the water retention rate; otherwise, the lower the water retention rate.
3. Viscosity
When the viscosity of?HPMC?increases, the water retention rate also increases; when the viscosity reaches a certain level, the increase of the water retention rate tends to be gentle.
4. The amount of HPMC added
The larger the added amount of cellulose ether HPMC, the higher the water retention rate and the better the water retention effect. In the range of 0.25-0.6%, the water retention rate increases rapidly with the increase of the addition amount; when the addition amount further increases, the increasing trend of the water retention rate becomes slower.
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