How to control the properties of semi-aqueous plastering gypsum? In general, the hemihydrate gypsum produced is often a mixture of hemihydrate gypsum and type III anhydrite. Type III anhydrous gypsum, also known as dehydrated hemihydrate gypsum, has the same crystal phase structure as the original hemihydrate gypsum. Type III anhydrous gypsum will quickly hydrate into
Hydroxypropyl methylcellulose (HPMC for short) has excellent thickening properties and can be used as an excellent concrete anti-dispersion agent. In recent years, with the continuous development of external wall insulation technology and the continuous progress of cellulose production technology . As well as the excellent characteristics of HPMC itself, HPMC has been widely used in
The setting time of concrete is mainly related to the setting time of cement, and the influence of aggregate is not great. Therefore, the effect of HPMC on the setting time of underwater non-dispersible concrete mixture can be studied through the setting time of mortar. Because the setting time of mortar is affected by water.
HPMC and HEMC have similar roles in building materials. It can be used as dispersant, water retaining agent, thickener and binder, etc. It is mainly used in the molding of cement mortar and gypsum products. Used in cement mortar to increase its cohesiveness, workability, reduce flocculation, improve viscosity and shrinkage, and have water retention, reduce
Hydroxypropylmethylcellulose (HPMC) Hydroxypropylmethylcellulose (HPMC) is a kind of cellulose variety whose output and consumption have increased rapidly in recent years. It is made of refined cotton after alkalization treatment. Using propylene oxide and methyl chloride as etherifying agent, it is a non-ionic cellulose mixed ether prepared through a series of reactions. The degree of substitution
Application of Hydroxypropyl Methyl Cellulose (HPMC) in Pharmacy(1) Let us continue talk about hydroxypropyl methyl cellulose (HPMC) in pharmacy 2.3 Used as thickener and suspending agent The suspending agent is a viscous gel substance with hydrophilicity, which can slow down the sedimentation speed of the particles when used in the suspending agent. And it can
This article mainly discusses HPMC in pharmacy HPMC is a variety of natural plant cellulose. And it is also an excellent pharmaceutical excipient, which has a wide range of sources. At present, it is widely used at home and abroad. It is one of the pharmaceutical excipients with the highest utilization rate in oral drugs.
Factors Affecting the Viscosity of Hydroxypropyl Methyl Cellulose Hydroxypropyl methyl cellulose (HPMC) is a nonionic water-soluble mixed ether of cellulose. Appearance is white to light yellow powder or granules, tasteless, odorless, non-toxic, chemically stable product, soluble in water to form a smooth and transparent viscous solution. 1. The relationship between viscosity and concentration The viscosity
Daily chemical grade hypromellose is a synthetic polymer made from refined cotton through chemical modification. Cellulose ether is a derivative of natural cellulose. The production of cellulose ether is different from synthetic polymers. Its basic material is cellulose, a natural polymer compound. Due to the particularity of the natural cellulose structure, the cellulose itself has
Hydroxypropyl methylcellulose(HPMC) is easily soluble in cold water, but it will encounter difficulty in dissolving in hot water. But its gelation temperature in hot water is significantly higher than that of methyl cellulose. The solubility in cold water is also greatly improved compared with methyl cellulose. Hydroxypropyl methylcellulose(HPMC) is stable to acid and alkali, and
