Hydroxypropyl
Methylcellulose (HPMC)
1.Composition and chemi1cal structure:
2.Technical specification:
Index |
Type |
E |
F |
K |
Methoxyl content ( WT%) |
28.0-30.0 |
27.0-30.0 |
19.0-24.0 |
Hydroxypropoxyl content ( WT%) |
7.0-12.0 |
4.0-7.5 |
4.0-12.0 |
Gelation temperature (°C) |
58.0-64.0 |
62.0-68.0 |
70.0-90.0 |
Loss or drying ( WT%) |
≤ 5.0 |
Burnt residues ( WT%) |
≤ 1.0 |
PH value(1% solution,25°C) |
4.0-8.0 |
Viscosity(mPa.s, 2% solution at 20°C) |
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°C.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:
25kg package in polyethylene bag or barrel with inner liners. Keep dry where good ventilated. Do not wet, and keep froom sunshine when transport. |
