Views:6 Author:Site Editor Publish Time: 2019-09-30 Origin:Site
The RDP is a water soluble redispersible powder. It is a copolymer of ethylene and vinyl acetate. It is easily soluble in water and forms an emulsion quickly. Its chemical properties are identical to those of the original emulsion. It has good bond strength, excellent alkali resistance, weather resistance, freeze-thaw resistance and excellent flexibility at low temperatures. Rdp for adhesive mortar particularly applicable to inorganic adhesive, such as cement, ash calcium powder, plaster mix or separate binding material, compared with the emulsion powder on the market, has the added quantity is little, the cost is low, the advantages of stable quality Redispersible polymer powder, produced by spray-drying special water-based emulsion, mostly based on vinyl acetate-ethylene (VAE),then obtained a free flowing organic polymer powder. It can re-disperse in water, and form a film after water evaporation by coalescence of individual polymer particles. The film acts as an organic binder, to glue together different substrates, reinforce mortar structure and provide excellent adhesion at cement or gypsum based dry mixed mortar substrate interface.
3. What are the dissolution methods of hydroxypropyl methylcellulose (HPMC)?——Answer: Hot water dissolution method: Since HPMC does not dissolve in hot water, HPMC can be uniformly dispersed in hot water at the initial stage, and then quickly dissolve during cooling. Two typical methods are describe
Industrial-grade hydroxypropyl methyl cellulose used in mortar is distinguished by viscosity. Generally, the following types are commonly used Low viscosity: 400 is mainly used for self-leveling mortar. Reason: low viscosity, good leveling, high mortar density. Medium and low viscosity: 20000-400000