How to distinguish the quality of dispersible polymer powder
Redispersible latex powder is widely used in construction mortar. Generally, good quality redispersible latex powder will not cause any harm to human body and will not release any harmful gas. Therefore, it is a good choice to use redispersible latex powder in construction mortar. The reason why more and more types of rubber powder appear is mainly because the use of rubber powder in construction does have many advantages, but now it is bought from the market. The quality of the mortar rubber powder received is uneven. Today, SLEOCHEM will teach you a few small methods how to distinguish the quality of the rubber powder used in the mortar.
1. From the appearance: the redispersible latex powder is a white powder, which can flow freely, without impurities, without agglomeration, and with uniform particles.
2. Look at the floating rate in the water: Take a certain amount of vitrified microbeads and soak them in the water. After a few minutes, check the proportion of the vitrified microbeads floating on the water surface. , the perlite with open pores will sink to the bottom naturally after absorbing water.
3. Look at the water absorption rate: take out the vitrified microbead insulation mortar soaked in water and weigh it. The overweight part is the water absorbed by the vitrified microbeads. The higher the water absorption rate, the lower the closed cell rate and the higher the water absorption rate. The perlite used in thermal insulation mortar may cause problems such as cracking and hollowing.
4. Look at the particle size: If a large amount of fine powder is found in the vitrified microbead insulation mortar, it is usually perlite ore (commonly known as raw meal) that has not been calcined at a sufficient temperature. These powders cannot achieve insulation effect, and Because the ore sand is not calcined, the specific gravity is very large. It is recommended to choose vitrified microbeads with uniform particle size and less fine powder.
5. Look at the hardness/strength: the open-pore expanded perlite will be broken by hand, and most of it will be broken after mechanical stirring by adding rubber powder, while the surface vitrification of vitrified microbead insulation mortar is larger than that of perlite. , the crushing rate after stirring is relatively low. However, it is still not recommended to mix the vitrified beads in a blender for too long.
6. Look at film-forming properties: good film-forming at room temperature. If the film formation at room temperature is not good, there are quality problems in the polymer or ash content.