The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
Cellulose ether is widely used in dry powder mortar such as tile adhesive, putty, self-leveling mortar, spraying gypsum, leveling gypsum, masonry mortar, plastering mortar, etc.
Cellulose ether can slow down the rate of water loss of mortar. The dehydration of mortar includes two processes: one is that the water inside the mortar diffuses to the surface; the other is that the water on the surface of the mortar evaporates or diffuses into the base material. Only when the mortar is rich in water can there be enough water to meet the needs of hydration and maintenance while diffusing.
Cellulose ether has the effect of significantly adsorbing water molecules, and even restrains the diffusion of water molecules to the surface through intermolecular forces, thereby slowing down the rate of dehydration of mortar. For scenes where the natural environment and construction environment are relatively harsh, cellulose ether can not only slow down the release of mortar stress, but also maintain the necessary water for the hydration reaction of cementitious materials, ensure the normal development of mortar performance, and improve the mortar’s resistance to harsh environments. Resistance.
The dehydration rate of mortar is related to the ambient temperature and humidity, the thickness of the mortar construction, the construction interface and the way of use. Different types of dry powder mortar also require different types of cellulose ethers in order to obtain excellent performance.
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