|
ITEM
|
RANGE
|
|
Hydroxypropyl content
|
7-12%
|
|
Methoxy content
|
25-30%
|
|
Ash
|
≤5%
|
|
Viscosity
|
20,000-200,000mpa.s
|
|
PH
|
5-8
|
|
Purity
|
99%
|
|
Gel temperature
|
55-65℃
|
|
Light transmittance
|
≥80%
|
I、Chemical name and structural formula：
II、Technical requirements
(In accordance with USP USP24 and EP EP standards)
|
Model Index
|
60QG |
65QG |
75QG |
|
Methoxyl (%) wt% |
28.0-30.0 |
27.0-30.0 |
19.0-24.0 |
|
Hydroxy propyl (%) wt% |
7.0-12.0 |
4.0-7.5 |
4.0-12.0 |
|
Temperature of gelation |
58-64℃ |
62-68℃ |
68-75℃ |
|
Moisture |
≤5.0 |
||
|
Ash |
≤1.0 |
||
|
PH value |
4.0-8.0 |
||
|
type |
specifications |
scope mpa.S |
|
low viscosity |
25 |
20-30 |
|
50 |
40-60 |
|
|
100 |
80-120 |
|
|
high viscosity |
4000 |
3500-5600 |
|
12000 |
10000-14000 |
|
|
Extra high viscosity |
20000 |
17000-22000 |
|
30000 |
27000-32000 |
|
|
40000 |
37000-42000 |
|
|
60000 |
58000-65000 |
|
|
100000 |
4100-5600* |
|
|
200000 |
|
Note: The viscosity value is the viscosity of a 2% aqueous solution at 20 ℃.
[ * ] A viscosity of 1% aqueous solution at 20 ° C.
In addition, it can also meet the corresponding needs according to different viscosity requirements of users.
1. Appearance: white or off-white powder.
2. Granularity: 80 mesh pass rate is 100%.
3. Carbonization temperature: 280-300°C.
4. Apparent density: 0.25-0.70g/cm³ (usually around 0.5g/cm²), specific gravity 1.26-1.31.
5. Discoloration temperature: 190-200°C.
6. Surface tension: 2% aqueous solution is 42-56dyn/cn.
7. Solubility: soluble in water and some organic solvents, such as ethanol/water, dioxide, etc. Aqueous solutions are surface-active. High transparency, stable performance, different specifications of product gel temperature is different, solubility changes with viscosity, the lower the viscosity, the greater the solubility, different specifications of HPMC have certain differences in their properties, HPMC dissolution in water is not affected by PH value.
8. With the decrease of methoxy content, the gel point increases, the water solubility decreases, and the surface activity also decreases.
9. HPMC also has the characteristics of thickening ability, salt discharge, low ash content, acid-base stability, water retention, dimensional stability, excellent film-forming, and a wide range of enzyme resistance, dispersion and adhesion.
IV、 Dissolution method:
1. Take the required amount of hot water, put it in a container and heat it to above 85°C, and gradually add this product under slow stirring, the cellulose floats on the water surface at first, but is gradually dispersed by the water to form a uniform slurry, which is cooled under stirring until it is transparent.
2. Or heat 1/3-2/3 of the water to more than 85°C, add cellulose to obtain hot water slurry, then add the remaining amount of cold water, keep stirring, and cool to about 20°C to obtain the mixture.
3. The number of cellulose mesh is fine, and it is a separate small particle in the evenly stirred powder, which is quickly dissolved after contact with water to form the required viscosity.
4. Or add cellulose slowly and evenly at room temperature, and stir constantly during the addition process until a transparent solution is formed.
V、Packag, storage and transportation precautions
Plastic-coated polypropylene woven bag or cardboard drum encapsulation lined with polyethylene film inner bag.
Net weight per bag (drum): 25 kg. Preventexposuretosunlight, rain, and moisture.
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