After dry-mixed mortar added with redispersible polymer powder is mixed with water, the modification of redispersible polymer powder on cement mortar is accomplished by redispersion of powder, hydration of cement and film formation of polymer. The film forming process of redispersible latex powder in mortar can be divided into three stages.
In Stage One, after mortar is stirred with water, polymer powder will be redispersed uniformly into the fresh cement mortar and emulsified again. During the stirring process, powder particles themselves will then be dispersed throughout the fresh mortar, but will not be agglomerated with cement particles. The “lubricating effect” of redispersible polymer powder particle enables the mortar mixture to have good construction performance; its air-entraining effect makes mortar compressible and thus easier for construction work. Protective colloids play an important role during the process in which polymer powder is dispersed into fresh cement mortar. The strong hydrophilicity of protective colloid itself gets the redispersible polymer powder to be completely dissolved at low shear forces, thus releasing the initial dispersed particles without changes in nature, and thereby polymer powder can be redispersed. Rapid redispersion in water is a key performance that maximizes the effect of polymer.
In Stage Two, cement hydration, surface evaporation and base absorption will result in constant consumption of free water in the mortar internal pores. The movement of polymer particles will naturally get increasingly restricted. The interfacial tension between water and air makes them gradually arranged in the capillary pores of cement mortar or in the mortar-base interface region. With the mutual contact of polymer powders, the network-like moisture between particles will evaporate by the capillary. The resulting high capillary tension will be applied to the surface of polymer particles, causing deformation of polymer sphere and making them fused together. At this time, the polymer film is roughly formed.
In Stage Three, through the diffusion of polymer molecules, polymer powders form a water-insoluble continuous film in the mortar, thereby improving the bonding with interface and the modification on mortar itself.
ABOUT CEMOTECH
→ Suzhou Cemo New Material Technology Co.,Ltd is a high-tech enterprise specialized in construction additives.
→ Estabilished in 2011 and expanded production scale in 2015.
→ Our production capacity is 10,000 tons of redispersible polymer powder, 5000 tons of polycarboxylic acid superplasticizer, 3000 tons of melamine superplasticizer, 2000 tons of defoamer, gypsum retarder, hydrophobic agent and other additives.
You can click here : https://www.cemotech.com
ABOUT CELOTECH
→Celotech Chemical is a group of companies that manufacturing cellulose ethers, polysacchrides, construction chemicals and providing technical services to many markets. It is a high-tech enterprise specialized in construction additives.
→ Founded in 2005, Celotech Chemicals is a young company but growing fast and consistently. Celotech set up the production site in Shandong, China and headquarted in Suzhou of Jiangsu province, a city very near Shanghai. Now the products of Celotech has exported to over 60 countries all over the world.
→ With our products Prestar®, Stargel® , Celopro®, Celofiber® and other additives produced within our group companies, like Vinabond® Redispersible Polymer Powder, Ultraplast® Superplasticizer, Gypstar® Gypsum Retarder, Foamsolver® defoamer, Quickset®Calcium formate, Aquago® Water repellent Agent, Celotech is supplying many customers in construction industry all over the world. At the same time we constantly develop new applications and product solutions in partnership with our customers.
You can click here :https://www.celotech.com