1, what is the main use of hydroxypropyl methyl cellulose (HPMC)?

Hydroxypropyl methyl cellulose is widely used in building materials, coatings, synthetic resins, ceramics, medicine, food, textile, agriculture, cosmetics, tobacco and other industries. Hydroxypropyl methyl cellulose can be divided into: construction grade, food grade and pharmaceutical grade according to its use. At present homemade is mostly construction level, in the construction level, the amount of putty powder is very large, about 90% is used to do putty powder, the rest is used to do cement mortar and glue.

2, hydroxypropyl methyl cellulose (HPMC) is divided into several kinds, what is the difference between its use?

HPMC can be divided into instant and heat soluble, instant products, in cold water quickly dispersed, disappeared in the water, at this time the liquid has no viscosity, because HPMC is just dispersed in the water, there is no real dissolution. About 2 minutes, the viscosity of the liquid gradually increases, forming a transparent viscous colloid. Heat soluble products, in cold water agglomeration, can be in hot water, quickly dispersed, disappear in hot water, until the temperature drops to a certain temperature, viscosity slowly appear, until the formation of transparent viscous colloid. Heat soluble type can only be used in putty powder and mortar, in liquid glue and coating, can appear agglomeration phenomenon, can not be used. Instant dissolve model, application scope is a few wider, in be bored with child powder and mortar, and in liquid glue and coating, all can be used, do not have what taboo.

3, how to determine the quality of hydroxypropyl methyl cellulose (HPMC) simple and intuitive?

(1) whiteness: although whiteness cannot determine whether HPMC is good, and if it is added in the production process, it will affect the quality. However, most good products have good whiteness. (2) fineness: HPMC fineness is generally 80 mesh and 100 mesh, 120 purpose less, Hebei HPMC mostly 80 mesh, the finer the fineness, generally speaking, the better. (3) transmittance: the hydroxypropyl methyl cellulose (HPMC) into the water, the formation of a transparent colloid, see its transmittance, the greater the transmittance is the better, the insoluble things inside less. The transmittance of vertical reactor is generally good, and that of horizontal reactor is worse, but it does not mean that the quality of the production of vertical reactor is better than that of horizontal reactor. There are many factors to determine the quality of the product. (4) Proportion: the larger the proportion, the heavier the better. Than major, because inside hydroxyl propyl base content is high commonly, hydroxyl propyl base content is high, protect water to want better.