Hydroxypropylmethylcellulose (HPMC) Additives for Self-Leveling Compound Mortar
Self-leveling compound mortar is a polymermodified cement, which is used to make flat and smooth floor surface for interior big building such as large shopping malls, supermarkets and industry workshop.hpmc additives self-leveling compound mortar hpmc hydroxypropyl methyl cellulose ether 300-500 cps It has the key property of anticracking, antishrinkage and preventing segregation, lamination, bleeding and other issues during construction. Hydroxypropyl methyl cellulose ether (HPMC) is an important additive for this type of product, which has the function of water keeping and improving the construction performance such as fluidity, consistency and workability.
HPMC is a nonionic water-soluble cellulose ether, which can be obtained from plant fiber or natural polymer fiber through series of chemical processes. It is a whiteor milkywhite, odorless, tasteless, nontoxic fibrous powder or granules. It is soluble in cold water and slightly soluble in hot water, but can’t dissolve completely due to its high molecular weight. In warm water, it swells and peptizes, forms a viscous colloidal solution, then cools into a solution.
It has excellent thickening effect and it can enhance the fluidity of mortar, which makes it easy to work with and improves its coating efficiency. It also has the function of water retention, which can keep moisture in the mortar for a long time, and prevent the cement or gypsum construction material from drying too quickly, or cracking due to lack of hydration.
In addition, it can improve the adherence between the mortar and substrate, reduce the slipping between interfaces and increase the adhesion strength between them. It can also extend the setting time of mortar, which is a very important issue for construction work.
The use of HPMC in selfleveling mortar can significantly increase the slurry consistency and its flowability, while reducing the sagging during spreading, and can be used for both cement based and gypsum based construction materials. It also increases the waterretention capability, allowing it to maintain a certain level of fluidity during construction, which is particularly important for large projects. It can also prevent the formation of skin on the slurry surface, which is a common problem in mortar. Moreover, it can effectively reduce the amount of Portland cement required to achieve a specified slurry consistency. It can also reduce the shrinkage of the slurry after drying, thus minimizing the cracking and shortening of the construction period. The low viscosity of HPMC can also improve the pumpability of the slurry, ensuring that it can be easily spread and pumped. This can greatly save labor and improve the overall quality of the slurry. It can also be added to slurry with higher water content to avoid the occurrence of lumps or voids during construction. This can be achieved by adding a small quantity of HPMC to the slurry during mixing. Besides, it can also reduce the water consumption of the slurry. This is especially important in regions with limited water resources. This is why it is an essential additive in selfleveling mortar.
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