Hydroxypropyl Methylcellulose (HPMC)

Hydroxypropyl methylcellulose is a methylcellulose modified witha small amount of propylene glycol ether groups attached to theanhydroglucose of the cellulose. The dry product contains 19 percent. to 30 per cent. of methoxyl (-OCH3) groups and 3 per cent. to12 per cent. of hydroxypropyl (-OCH2CHOHCH3) groups.

Chemical names: Propylene glycol ether of methylcellulose

Property:
(1) Appearance: white or off-white powder
(2) Particle size: throughput efficiency of above 98.5% in 100mesh, and 100% in 80 mesh.
(3) Carbonization temperature: 280-300
(4) Apparent density: 0.25-0.70g.cm3(usually about 0.5g/cm3),specific gravity: 1.26-1.31.
(5) Color degradation temperature: 190-200
(6) Surface tension: 42-56dyn/cn(2% aqueous solution)
(7) Soluble in water and some organic solvents: its aqueoussolution is of surface tension, high transparency and stableproperty. The solubility varies with the viscosity, the lower theviscosity is, the higher solubility it has. The different HPMC isdifferent in some properties and its solubility in water is notaffected by pH
(8) The lower methoxyl content in HPMC, the higher gelatificationtemperature, the lower solubility in water and surfaceactivity.
(9) HPMC has also other characteristic such as thickening property,pH stability, water retention , excellent film-forming property andgood disperse and adhesion power.
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Note: 2% aqueous solution at 20 ; 1% aqueous solution at 20 degreeC.

Usage: Hydroxypropyl methylcellulose is mainly used asdispersant in the production of PVC and as thickener, stabilizer,emulsifier, excipient, water retention agent, film-forming agent inpetrochemical, building materials, agrochemical, ink, printing anddyeing of textile, paper making, cosmetic, etc.

Dissolving method:
(1) Heat the water to above 85 and slowly add HPMC under slowagitation to gradually form uniform pulp, then cool under agitationto become transparent.
(2) Heat one third to two third of needed water to above 85, addHPMC to form heat pulp, then add residual water and remainagitation, cool to about 20 .

Package and storage: Sealed in the plastic-plated polypropylenewoven bag, net weight: 20kg, keeping away from sun, rain andmoisture during storage and transportation.