1. Composition and chemi1cal structure:
2. Technical specification:
Index |
Type |
K |
Methoxyl content ( WT%) |
19.0-24.0 |
Hydroxypropoxyl content ( WT%) |
4.0-12.0 |
Gelation temperature (¡ãC) |
70.0-90.0 |
Loss or drying ( WT%) |
¡Ü 5.0 |
Burnt residues ( WT%) |
¡Ü 1.0 |
PH value(1% solution,25¡ãC) |
4.0-8.0 |
Viscosity(mPa.s, 2% solution at 20¡ãC) |
5-100000 |
3. Physical Properties:
(1) Out looking: HPMC is a white or light gray pellet or fibril power with odorless and tasteless.
(2) Solubility: hardly dissolves in waterless ethanol, aether or acetone. Expands as to clear or slightly muddy colloid solution in cold water. It can dissolve in some organic solvents or some water-organic components.
(3) Pellet: 100 screen passable rate is over 98.5%, 80 screen passable rate is 100%.
(4) Density: 0.30-0.70g/cm3,Density:1.26-1.31g/cm3.
4. Dissolving process:
HPMC will agglomerate when directly added to water and then dissolve. In this way it dissolves very slow and hard. Suggested methods as followers:
(1) In hot water. Add water in container to 1/3 or 2/3 of its content. Heated to over 80¡ãC.Because HPMC doesn't dissolve in hot water, it uniformly disperses in hot water. Add cool water or ice to the residual content, stir and cool down the mixture.
(2) Powder combination. Mix HPMC with identical volume of other powder, dispersesthem sufficiently then add water to the mixture result HPMC dissolves without agglomeration.
(3) Organic solvent wet. Dispersed or wet with organic solvents such as ethanol, glycol or oil, then add water can cause HPMC completely dissolves
5. Application: HPMC is mainly used as dispersant in the production of PVC and as thickener, stabilizer, emulsifier, excipient, water retention agent, film-forming agent in petrochemical, building materials, agrochemical, ink, printing and dyeing of textile, paper making, cosmetic, etc.
6. Packing, transport and storage: In 25kg net kraft paper bag, 12MTs/20¡¯FCL, 10MTs /20¡¯FCL if palletized.
Keep dry where good ventilated. Do not wet, and keep from sunshine when transport. |