As a powder binder, redispersible latex powder is widely used in the construction industry. The quality of redispersible latex powder is directly related to the quality and progress of construction. With the rapid development, there are more and more R&D and production enterprises entering into dispersible polymer powder products, and users have more and more choices, but at the same time, the quality of redispersible polymer powder has become uneven and mixed. In order to reduce costs, some manufacturers disregard quality standards, shoddy, and some even sell them at low prices under the guise of redispersible latex powder with general resin rubber powder, which not only disturbs the market but also deceives them. consumer.

How to distinguish the quality of redispersible latex powder? Here are some preliminary methods to identify the quality of redispersible latex powder:

1. Judging from the appearance: use a glass rod to cover a small amount of redispersible latex powder on the surface of a clean glass plate thinly and evenly, place the glass plate on white paper, and visually inspect the particles, foreign matter and coagulation. Exterior. The appearance of redispersible latex powder should be white free-flowing uniform powder without irritating odor. Quality problems: abnormal color of latex powder; impurities; rough particles; pungent odor;

2. Judgment by dissolution method: take a certain amount of redispersible latex powder and dissolve it in 5 times the mass of water, stir well and let it stand for 5 minutes before observing. In principle, the less intolerants that settle to the bottom layer, the better the quality of the redispersible polymer powder;

3. Judging from the ash content: take a certain amount of redispersible latex powder, place it in a metal container after weighing, heat it up to 800 ℃, after 30min burning, cool it to room temperature, and weigh again. The light weight is relatively good quality. Light weight and good quality. Analysis of the reasons for the high ash content, including improper raw materials and high inorganic content;

4. Judging by the film-forming method: The film-forming property is the foundation of the mortar modification functions such as bonding, and the film-forming property is poor, which is usually caused by excessive increase of inorganic components or improper organic components. The redispersible latex powder of good quality has good film-forming properties at room temperature, but the film-forming properties at room temperature are not good, and most of them have quality problems in terms of polymer or ash content.

Test method: Take a certain quality of redispersible latex powder, mix it with water at a ratio of 1:1 and stir it evenly for 2 minutes, stir it again, pour the solution on a flat clean glass, and place the glass in a ventilated and shaded place. When it is fully dry, peel it off. Observe the removed polymer film. High transparency and good quality. Then pull moderately, with good elasticity and good quality. The film was then cut into strips, immersed in water, and observed after 1 day, the quality of the film was less dissolved in water.

The above is just a simple method, which cannot be completely identified as good or bad, but preliminary identification can be carried out. Add the rubber powder to the mortar according to the instructions for use, and test the mortar according to the corresponding mortar standard. This method is more objective.