Necessity of adding cellulose to gypsum-based products
Because of air temperature, humidity, wind pressure, wind speed and other factors, it will affect the evaporation rate of water in gypsum-based products.Therefore, hydroxypropyl methylcellulose ether (HPMC) plays an important role in gypsum-based leveling mortar, caulking agent, putty and gypsum-based self-leveling.
Water retention of HPMC
Excellent hydroxypropyl methyl cellulose ether (HPMC) can effectively solve the problem of water retention at high temperature.
Its methoxy and hydroxypropyl groups are evenly distributed along the cellulose molecular chain, which can improve the ability of oxygen atoms on hydroxyl and ether bonds to associate with water to form hydrogen bonds, and make free water become bound water, thus effectively controlling water evaporation caused by high temperature weather and achieving high water retention.
Construction of HPMC
Correctly selected cellulose ether products can quickly infiltrate into various gypsum products without agglomeration, and have no negative impact on the porosity of cured gypsum products, thus ensuring the respiratory performance of gypsum products.
It has a certain retarding effect but does not affect the growth of gypsum crystals; Ensure the bonding ability of the material to the base surface with proper wet adhesion, greatly improve the construction performance of gypsum products, and be easy to spread without sticking to tools.
Lubrication of HPMC
High-quality hydroxypropyl methylcellulose can be evenly and effectively dispersed in cement mortar and gypsum-based products, and all solid particles are wrapped, and a wetting film is formed. The moisture in the matrix is gradually released for a long time, and it reacts with inorganic cementitious materials to ensure the bonding strength and compressive strength of the materials.
