| 1.
Molecular Structure:
| |
| n:degree of polymerization; R:-H,-CH3
or CH2CHOHCH3 |
2. Quality Index:
| Methoxyl, wt% |
28.0-32.0 |
| Dry Loss, wt% |
 5 |
Viscosity(2% aqueous solution,20  ),
mpa.s |
5-60000 |
| Ignition residue, wt% |
1 |
| Heavy metal, ppm |
20 |
| As, PPM |
2 |
| PH |
6.5-7.5 |
3. Characteristic:
| (1) |
Property: white powder, odorless,
smellless and nontoxic. |
| (2) |
Water retention: it can absorb several times water
than the weight itself to maintain high retention of water in
stucco, plaster, coating, etc. |
| (3) |
Soluble in cold water to form transparent viscous
liquid. |
| (4) |
Soluble in some organic solvent and the mixed
solvent of water and organic compound because of the existence
of hydrophobic group. |
| (5) |
Salt resistance: it is a kind of nonionic and
non-polyelectrolyte so as to be stable in metal salt and the
aqueous solution of organic electrolyte. Gelatification and
precipitation will occur if much electrolyte. |
| (6) |
Surface activity: its aqueous solution is of surface
activity to act as colloid protective agent, emulsifier and
dispersant. |
| (7) |
Heat gelatification: when heated to certain temperature,
the aqueous solution will change into nontransparent one because
of gelatification and precipitation. When gradually cooled,
it will rechange into original state. The temperature of gelatification
and precipitation is decided by the type of product, the concentration
of solution and heated speed. |
| (8) |
Low ash: because of the property of heat gelatification,
adopting heat water to wash during preparation to refine the
product.Therefore, it is of low ash content. |
| (9) |
pH stability: the viscosity of aqueous solution
is little affected by acid and alkali, its aqueous solution
is stable in wide pH range from 3.0 to 11.0 |
|
(10) |
Shape retention: compared with other water-soluble
polymer, its aqueous solution has special viscoelastic performance. |
| (11) |
Lubricating property: reduce friction coefficient to improve
the lubricating property of ceramics and concrete products. |
| (12) |
Film-forming property: form solid, flexible and
transparent film to show good resistance to oil and ester. |
4. Dissolving method:
Heat the water to 80-90
and slowly add MC under continuous agitation, 
after reduction in temperature and cooling to form uniform aqueous
solution. Or add one third to two third of needed water, heat them
to 80-90
and slowly add MC under continuous agitation, after swelling, add
residual cool water and cooling.
5.Usage:
It is widely used as thickener, adhesive, water retention agent,
film-forming agent, excipient and emulsifier in construction, building
materials, dispersed coating, polymerization auxiliaries, cosmetic,
medicine, food, leather, ink and paper making, etc.
6. Package: sealed
in the plastic-plated woven bag, net weight:20kg.
7. Storage: keep
away form sun, rain and moisture. |
Methyl Cellulose
