Quick answer to hydroxypropyl methylcellulose, are you ready?
For hydroxypropyl methylcellulose, many people may not be very clear. From the name, it is very complicated. Today, Xiaobian will help you understand this product from several small issues. Please read carefully. Oh.
1. What is the primary use of hydroxypropyl methylcellulose (HPMC)?
——A: HPMC is widely used in the construction of materials, coatings, synthetic resins, ceramics, medicine, food, textile, agriculture, cosmetics, tobacco and other industries. HPMC can be divided into: build level, food grade and pharmaceutical grade. At present, most of the domestically produced grades are built. In the construction grade, the amount of putty powder is very large, about 90% is used for making putty powder, and the other is used as cement mortar and glue.
2, hydroxypropyl methylcellulose (HPMC) is divided into several, what is the difference in its use?
——A: HPMC can be divided into instant type and hot-dissolving type, instant type products, which quickly dissipate in cold water and disappear into the water. At this moment, the liquid has no viscosity, because HPMC is only scattered in water, and there is no real dissolution. In about 2 minutes, the viscosity of the liquid gradually increased to form a clear, viscous colloid. The hot-melt type product, in the case of cold water, can quickly disperse in hot water and disappear in hot water. When the temperature drops to a certain temperature, the viscosity gradually appears until it constitutes a clear and viscous colloid.
The hot-dissolved type can only be used in putty powder and mortar. In liquid glue and coating, it will show a clumping phenomenon and cannot be used. Instant type, a wide range of applications, can be used in putty powder and mortar, as well as liquid glue and paint, no jealousy.
3. What are the dissolution methods for hydroxypropyl methylcellulose (HPMC)?
——A: Hot water dissolution method: Because HPMC is not dissolved in hot water, the initial HPMC can be uniformly dispersed in hot water and then quickly dissolved during cooling. Two typical methods are as follows:
1) Place the required amount of hot water in the container and heat to about 70 °C. Gradually participate in the cellulose under the gradual mixing, start the appearance of the HPMC floating on the water, and then gradually form a slurry, and cool the slurry under mixing.
), take the required amount of 1/3 or 2/3 of water in the container, and heat to 70 ° C, according to 1), smash HPMC to prepare hot water slurry; then participate in the remaining amount of cold water to hot water silt In the slurry, the mixture is cooled after mixing.
Powder mixing method: the HPMC powder is mixed with a large amount of other powdery substances, mixed with a mixer, and then dissolved with water. At this moment, HPMC can dissolve without agglomerating, because each tiny small corner has only a little HPMC. The powder will dissolve immediately upon contact with water. - Putty powder and mortar manufacturers use this method.
After reading the above questions about hydroxypropyl methylcellulose, is it suddenly clear? It is believed that a lot of understanding of these aspects will be of great help to your better use of this product.
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