The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
1. Water retention
Hydroxypropyl methylcellulose for construction prevents excessive absorption of water by the substrate, and the water should be retained in the plaster as much as possible during the period when the gypsum is solidified. This characteristic is called water retention and is directly proportional to the viscosity of the hydroxypropyl methylcellulose solution for construction in the plaster. The higher the solution viscosity, the higher the water retention capacity. Once the water content is increased, the water retention capacity decreases. This is because the increased water dilutes the solution of hydroxypropyl methylcellulose for construction, resulting in a decrease in viscosity.
2. Anti-sagging
With anti-sagging plaster, the builder can apply a thicker coating without sagging, which also means that the plaster itself has no thixotropy, otherwise it will slide down during construction.
3. Reduce viscosity and easy construction
By adding various construction-specific hydroxypropyl methylcellulose products, gypsum plaster with low viscosity and easy construction can be prepared. When using a lower viscosity grade of construction-specific hydroxypropyl methylcellulose, the viscosity is relatively reduced The construction becomes easier. However, the water retention capacity of hydroxypropyl methylcellulose for low-viscosity construction is relatively weak, and the added amount needs to be increased.
4. The compatibilization rate of plaster
For a fixed amount of dry mortar, it is more economical to produce a higher volume of wet mortar, which can be achieved by adding more water and bubbles. However, when the amount of water and bubbles is too much, the strength is impaired.
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