Method of film forming experiment of redispersible latex powder

Redispersible latex powder is the main organic binder in the mortar of the external wall insulation system, ensuring the strength and comprehensive performance of the later system, and mixing the entire insulation system into one. It is also widely used in other building materials, such as high-grade putty powder for exterior walls. Improving construction and improving flexibility are also vital to the quality of putty powder. However, with the increasingly fierce competition in the market, VAE redispersible latex powder products have many mixed products, which have potential application risks for downstream mortar putty powder customers. According to our product grasp and experience analysis, the following methods can be used to initially distinguish The quality is good or bad, please refer to:
Methods as below:
1. Dissolving method, according to the ratio of latex powder: water = 1:4, dissolve the redispersible latex powder in water. After fully stirring, let it stand for 10 minutes. If the bottom sediment is less, the quality of the redispersible latex powder in preliminary analysis is better. This method is relatively simple to operate.
2. Ash method, take a certain amount of redispersible latex powder, weigh it and place it in a metal container, heat it up to about 800 degrees, after burning at 800 degrees, cool it to room temperature, and weigh it again. The more the weight is reduced, the better the quality. This method requires experimental instruments such as crucibles, suitable for laboratory operations.
3. Film forming method, according to the ratio of latex powder: water=1:2, dissolve the redispersible latex powder in water. After stirring, let it stand for 5 minutes, stir again, and pour the solution into a flat On clean glass, put the glass in a ventilated and shaded place. After the moisture evaporates to dryness, peel it off the glass. Observe the removed polymer film, the higher the transparency, the better the quality. The film can also be cut into strips, soaked in water, and observed after 1 day, the less dissolved in water, the better the quality. This method is also relatively easy to operate.