| Methoxy, % | 27-30 |
| Hydroxypropyl, % | 7.0-12 |
| Gel temperature, ℃ | 55-68 |
| Moisture, % | ≤5 |
| Viscosity (2%, 20℃) | 5-200000 |
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Production Process
Hydroxypropyl methyllose (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 (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
(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 lose 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 exnt anti-grease and anti-oxidation properties.
(8) Enzyme resistance: The solution of HPMC has exnt enzyme resistance and good viscosity stability.
(9) stability: HPMC is relatively stable to acid and alkali, and the 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 exnt anti-sagging ability
(12) Dispersion: HPMC can reduce the interfacial tension between ses, so that the dispersed se 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/l³, 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.
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