synonym: HPMC; E464; MHPC; Hydroxypropyl methylcellulose. Hydroxypropyl methyl cellulose,Hypromellose.
CAS no. : 9004-65-3
Molecular weight: 86000.00000
HPMC Physical properties:
Appearance and properties: white or white fibrous or granular powder.
Density: 1.39 g/cm3.
Stability: solids are flammable and incompatible with strong oxidizing agents.
HPMC chemical properties
1.Appearance: white or white powder.
2.Granularity;98.5% pass 100 mesh; 100% pass 80 mesh . special sizes 40 ~ 60.
3. carbonization temperature: 280-300 ℃
4.Visual density: 0.25-0.70g/cm(usually around 0.5g/cm), with weight 1.26-1.31.
5.color temperature: 190-200 ℃
6.Surface tension: 2% water solution 42-56dyn/cm.
7.Aqueous solution has surface activity.
8.The content of HPMC decreased with the content of methoxy, increased gel point, decreased water solubility, and decreased surface activity.
HPMC Production method:
Crush refined cotton and treated with alkali liquor in 35-40 ℃ for half an hour, crushing, smash cellulose, in 35 ℃ suitable for aging, make base fiber average degree of polymerization in required range. And put alkali fiber into etherification kettle, add epoxy propane and methyl chloride and 50-80 ℃ in etherification 5 h, highest pressure 1.8 MPa. Dehydrate with centrifuge.
HPMC Solution dissolving method:
- All HPMC grades can be added to material by dry mixing method;
- After mixing ordinary model with hot water, add cold water and stir to cool.
Hydroxypropyl methylcellulose,Hydroxypropyl methyl cellulose,Hypromellose,HPMC