HPMC Hydroxypropyl methyl cellulose

Production Process
Hydroxypropyl methylcellulose (HPMC) is made of refined cotton after being pulverized, then reacted with sodium hydroxide (liquid caustic soda) solution for alkalization, and then added chloromethane + propylene oxide for etherification reaction to form crude HPMC After neutralization (PH value adjustment), pressure filtration, drying, crushing and sieving, a certain fineness of pure HPMC can be obtained. The finished product has a slight odor, the smell of methane.

Application performance
(1) Water solubility: It can be dissolved in water in any proportion, the maximum concentration depends on the viscosity, and the dissolution is not affected by pH.
(2) Organic solubility: HPMC can be dissolved in some organic solvents or aqueous solutions of organic solvents such as dichloroethane, ethanol solution, etc.
(3) Thermal gel properties: When their aqueous solutions are heated to a certain temperature, reversible gels will appear, and they have controllable quick-setting properties.
(4) No ionic charge: HPMC is a non-ionic cellulose ether and will not complex with metal ions or organic matter to form insoluble precipitates.
(5) Thickening: Its aqueous solution system has thickening properties, and the thickening effect is related to its viscosity, concentration and system.
(6) Water retention: HPMC or its solution can absorb and retain water.
(7) Film-forming properties: HPMC can be made into smooth, tough and elastic films, and has excellent anti-grease and anti-oxidation properties.
(8) Enzyme resistance: The solution of HPMC has excellent enzyme resistance and good viscosity stability.
(9) PH stability: HPMC is relatively stable to acid and alkali, and the pH is not affected in the range of 3-11.
(10) Surface activity: HPMC provides surface activity in the solution to achieve the required emulsification and protective colloid effects.
(11) Anti-sagging: HPMC increases the thixotropic performance of the system in putty powder, mortar, tile adhesive and other products, and has excellent anti-sagging ability
(12) Dispersion: HPMC can reduce the interfacial tension between phases, so that the dispersed phase can be uniformly dispersed into droplets of appropriate size.
(13) Cohesiveness: It can be used as a binder for paper with a pigment density of 370-380g/l±, and it can also be used in coatings and adhesives.
(14) Lubricity: It can be used in rubber, asbestos, cement and ceramic products to reduce friction and improve the pumpability of concrete slurry.
(15) Suspension: It can prevent the fixed particles from settling out and inhibit the formation of precipitates.
(16) Emulsification: Since it can reduce the surface and interfacial tension, it can stabilize the emulsion.
(17) Protective colloid: a protective layer is formed on the surface of the dispersed droplets to prevent the droplets from merging and aggregating to achieve a stable protective effect.