Redispersible latex powder is a water-soluble redispersible powder, which is a copolymer of ethylene and vinyl acetate, with polyvinyl alcohol as a protective colloid. Therefore, redispersible latex powder is very popular in the construction industry market, and the construction effect is not ideal due to improper selection of redispersible latex powder. It is important to choose suitable redispersible latex powder, so how to identify and select redispersible latex powder?
Method for identifying redispersible latex powder
Mix the redispersible latex powder and water at a ratio of 1:5, 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.
Mix the redispersible latex powder and water at a ratio of 1:2, 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 the less dissolved is better.
Take an appropriate amount of latex powder and weigh it. After weighing, put it in a metal container, heat it up to about 500 degrees, burn it at a high temperature of 500 degrees, and weigh it after cooling. The lighter the weight, the better the quality.
Test with glue on carton board or veneer. Take two small carton boards or thin wood boards of equal size, and apply glue on the interface of the sample. After 30 minutes of pressure on the object, take it out for inspection. If it can be firmly bonded and 100% of the interface is destroyed, it is a good quality latex powder product. If the interface can only be partially destroyed, it means that the bonding strength of the latex powder is not very good and the quality is unqualified. If the interface is intact and not damaged, it means that it is of inferior quality and counterfeit.
How to choose dispersible latex powder
Glass transition temperature of redispersible latex powder. The glass transition temperature is an important indicator of the physical properties of the redispersible latex powder. For a specific product, a reasonable selection of the glass transition temperature of the redispersible latex powder is conducive to enhancing the flexibility of the product and avoiding problems such as cracking.
Resolvability.
Low film forming temperature. After the redispersible latex powder is mixed with water and re-emulsified, it has similar properties to the original emulsion, that is, a film will be formed after the water evaporates. The film has high flexibility and good adhesion to various substrates.
The above is the method of identifying redispersible latex powder and selecting dispersible latex powder for your reference. Anyone engaged in the construction industry knows its importance. The quality of latex powder is directly related to the quality and progress of construction. It is important to choose the right redispersible latex powder.
Post time: Apr-26-2023