The polymer film formed by redispersible latex powder has good flexibility. Films are formed in the gaps and surfaces of cement mortar particles to form flexible connections. Thus making the brittle cement mortar elastic. Mortar added with redispersible latex powder is several times higher in tensile and flexural resistance than ordinary mortar.
Redispersible latex powder is a thermoplastic resin with good flexibility, which can make the mortar cope with the change of external cold and hot environment, and effectively prevent the mortar from cracking due to the change of temperature difference. Mainly used in cement dry powder mortar in the construction industry, it is an important additive of cement dry powder mortar, the method to identify the quality of redispersible latex powder:
1. Mix the redispersible latex powder and water at a ratio of 5, stir evenly and let it stand for 5 minutes, then observe the sediment at the bottom. Generally, the less sediment, the better the quality of the redispersible latex powder.
2. Mix the redispersible latex powder and water at a ratio of 2, stir evenly and let it stand for 2 minutes, then stir evenly, pour the solution on a flat clean glass, place the glass in a ventilated and shaded place, and fully dry Finally, peel off the coating on the glass and observe the polymer film. The more transparent it is, the better the quality of the latex powder is. Then pull the film moderately. The better the elasticity, the better the quality. Cut the film into strips Soak in water, observe after 1 day, the quality of less dissolved is good,
3. Take an appropriate amount of latex powder and weigh it. After weighing, put it in a metal container and heat it up to about 500 degrees. After cooling, weigh the lighter the better the quality