Some preliminary identification methods of dispersible latex powder

As a powder adhesive, dispersible latex powder is widely used in the construction industry. The quality of dispersible latex powder is directly related to the quality and progress of construction. With the rapid development of the domestic building energy-saving market , There are more and more R&D and production companies entering dispersible latex powder products, and users have more and more room for choice, but at the same time, the quality of dispersible latex powder has become uneven, and good and bad are mixed. In order to reduce costs, some manufacturers disregard the quality standards, shoddy as good ones, and some even use ordinary resin powders as redispersible latex powders to sell at low prices under the guise of redispersible latex powders, which not only disturbs the market but also deceives consumer.

How to distinguish the quality of dispersible latex powder, here are a few methods to initially 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 thinly and evenly on the surface of a clean glass plate, 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 smell. Quality problems: abnormal color of latex powder; impurities; rough particles; pungent smell;

2. Judgment by dissolution method: Take a certain amount of redispersible latex powder and dissolve it in water with 5 times the mass, stir it fully and let it stand for 5 minutes before observing. In principle, the less content that settles to the bottom layer, the better the quality of the dispersible latex powder;

3. Judging from the ash content: Take a certain amount of dispersible latex powder, weigh it, place it in a metal container, heat it up to 800°C, burn it for 30 minutes, cool it to room temperature, and weigh it again. Relatively good quality for light weight. Good quality for light weight. Analysis of the reasons for the high ash content, including improper raw materials and high inorganic content;

4. Judgment by film-forming method: film-forming property is the foundation of mortar modification functions such as adhesion, and film-forming property is poor, usually due to excessive increase of inorganic components or improper organic components. Good-quality redispersible latex powder has good film-forming properties at room temperature, and poor film-forming at room temperature, most of which have quality problems in terms of polymer or ash content.

Test method: Take a certain quality of dispersible latex powder, mix it with water at a ratio of 1:1 and let it stand for 2 minutes, then stir it evenly again, pour the solution on a flat piece of clean glass, and place the glass in a ventilated and shaded place. After it is fully dry, peel it off. Observe the peeled polymer film. High transparency and good quality. Then pull it moderately, the elasticity is good and the quality is good. Then cut the film into strips, soak it in water, and observe after 1 day, the quality of the less dissolved by water is better.