As for hydroxypropyl methylcellulose, many people may not be clear about it, but it is very complicated from the name. Today I will come to help you understand this product from a few small questions. Please read it carefully.
1.What is the primary use of hydroxypropyl methylcellulose (HPMC)?
——A: HPMC is widely used in construction materials, coatings, synthetic resins, ceramics, medicine, food, textile, agriculture, cosmetics, tobacco and other industries. HPMC can be divided into construction grade, food grade and pharmaceutical grade according to its use. At present, most of the domestic production is in the construction level. In the construction level, the amount of putty powder is large, about 90% is used for putty powder, and the other is used for cement mortar and glue.
2. There are several types of hydroxypropyl methylcellulose (HPMC). What is the difference between them?
——A: HPMC can be divided into instant-soluble and hot-dissolved, instant-dissolved products, which dissipate quickly in cold water and disappear into the water. At this moment, the liquid has no viscosity, because HPMC just disperses in water and does not dissolve. About 2 minutes, the viscosity of the liquid gradually increased, forming a clear viscous colloid. Hot-melt products can quickly disperse in hot water and disappear in hot water when they clump in cold water. When the temperature drops to a certain temperature, the viscosity gradually appears until it forms a clear viscous colloid.
The hot melt type can only be used in putty powder and mortar. In liquid glue and coating, it will show clumping phenomenon and cannot be used. Instant type, with a wider range of applications, can be used in putty powder and mortar, as well as liquid glue and paint, there is no taboo.
3.What are the dissolution methods of hydroxypropyl methylcellulose (HPMC)?
——A: Hot water dissolution method: Because HPMC does not dissolve in hot water, HPMC can be dispersed evenly in hot water at the beginning, and then quickly dissolve when cooled. Two typical methods are described below:
1) Put the required amount of hot water in the container and heat it to about 70℃ Gradually participate in cellulose with gradually mixing, start HPMC floating on the surface of water, and then gradually form a slurry, and cool the slurry with mixing.
Participate in the required amount of 1/3 or 2/3 of water in the container and heat to 70 ℃According to the method of 1), disperse HPMC to prepare hot water slurry; then join the remaining amount of cold water to hot water In a slurry, the mixture is cooled after mixing.
Powder mixing method: HPMC powder is mixed with a large number of other powdery materials, and is thoroughly mixed with a mixer, and then dissolved in water. At this moment, HPMC can be dissolved without clumping, because each small corner has only a little HPMC. The powder will dissolve immediately when contacted with water. ——Putty powder and mortar manufacturers use this method.
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