HEMC

HEMC,HPMC
Hydroxypropyl Methyl Cellulose
CAS 9004-65-3
Leather Auxiliary Agents
GB:Q/79339844-1.01-2008
HEMC
Hydroxypropyl Methyl Cellulose
CAS:9004-65-3
Purity: 98%
Type: Chemical additives
Usage: Leather Auxiliary Agents
Hydroxypropyl Methyl Cellulose (HPMC) is widel used as thickener, adhesive, water preserving agent, film-forming agent in construction, building materials, dispersion coating, wallpaper paste, polymerization aids, leathers, printing ink and paper making etc.l also used in petroleum drilling and daily-use chemicals
1.Appearance: HPMC is white or similar to white fiber or granular powder; odorless .
2.Properties: almost insoluble in ethanol, ether and acetone; quickly dispersed in 80-90°C water; aqueous solution is very stable in room temperature; has good wetting/dispersing/adheisve/thickening/emlusifying/water preserving/film-forming properties; can prevent the infilration of grease; film formed has excellent flexibility and trransparency; has good compatibility with other emulsifier; easy salting-out. its solution is stable with PH 2-12.
3.Apparent density: 0.30-0.70g/cm3, density is 1.3g/cm3.

Technical index of HPMC
Quality Standard: Q/79339844-1.01-2008
Index name
Model
KH60
KH65
KH75
MethoxyWT%
28.030.0
27.030.0
19.024.0
HydroxypropoxyWT%
7.012.0
4.07.5
4.012.0
Gelling temperature
58.064.0
62.068.0
70.090.0
MoistureWT%
≤5.0
Residue on ignitionWT%
≤1.0
PH Value1% solution , 25
5.07.5


Viscosity Standard2% solution , 20,NDJ-8S
NDJ-1 2% solution 20
B type Viscosimeter 2% solution 20
Nominal Viscosity(mPa.s)
Range
Nominal Viscosity(mPa.s)
Range
5
3-9
15000
13000-17000
15
10-20
20000
18000-22000
25
20-30
30000
23000-34000
50
40-60
40000
35000-45000
100
80-120
50000
46000-55000
400
300-500
60000
56000-64000
800
700-900
75000
65000-85000
1500
1200-2000
80000
75000-85000
4000
3500-4500
10
850000
8000
7000-9000
150000
130000-180000
10000
9000-11000
200000
180000 or more

Properties:
1.Appearance: HPMC is white or similar to white fiber or granular powder; odorless .
2.Properties: almost insoluble in ethanol, ether and acetone; quickly dispersed in 80-90 water; aqueous solution is very stable in room temperature; has good wetting/dispersing/adheisve/thickening/emlusifying/water preserving/film-forming properties; can prevent the infilration of grease; film formed has excellent flexibility and trransparency; has good compatibility with other emulsifier; easy salting-out. its solution is stable with PH 212.
3.Apparent density: 0.300.70g/cm3, density is 1.3g/cm3.

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.
HPMC does not dissolve in hot water. The primary HPMC can be uniformly disperse in hot water. Then cool down in two ways:
a) Add hot water in container and heated to over 70. Add HPMC gradually while slowly, stir. At the beginning, HPMC float on the top of water, then turns into slurry state stir and cool down.
b) Add water in container to 1/3 or 2/3 of its content. Heated to over 70 add HPMC by sequence of a). Make it disperse to form slurry state. Add cool water or ice to the resideual content, stir and cool down the mixture.
2. Powder combination.
Mix HPMC with identical volume of other powder, disperses them sufficiently then add water to the


Application
It is widel used as thickener, adhesive, water preserving agent, film-forming agent in construction, building materials, dispersion coating, wallpaper paste, polymerization aids, leathers, printing ink and paper making etc.l also used in petroleum drilling and daily-use chemicals

Packing
Net wt 15kg or 20kgs in cardboard drum with PE lining or coated PP woven bag, stored indoors in dry and draughty place; avoid rain and sunlight during transporting.