Additives in Mortar – Cellulose Ether
The main components of building mortar
|
gel system |
Aggregate |
|
cement |
Ordinary aggregate |
|
Portland cement |
Quartz sand |
|
Slag Portland Cement |
limestone |
|
blast furnace slag cement |
dolomite |
|
lime |
decorative aggregate |
|
slaked lime |
Calcite |
|
hydraulic lime |
marble |
|
Mica |
|
|
plaster |
light aggregate |
|
β－，α－ |
Perlite |
|
hemihydrate gypsum |
Vermiculite |
|
Anhydrite |
foam glass |
|
Ceramsite |
|
|
pumice |
Admixture
Cellulose ether、Redispersible latex powder, air-entraining agent, pigment, coagulant, retarder, plasticizer, thickener, water repellent…
natural resource cellulose
| source |
Fiber content |
|
| （bagasse） |
35 ～ 45 |
|
| （straw） |
40 ～ 50 |
|
| ( wood) |
40 ～ 50 |
|
| (bamboo) |
40 ～ 55 |
|
| (jute) |
60 ～ 65 |
|
| (flax) |
70 ～ 75 |
|
| (ramie) |
70 ～ 75 |
|
| (kapok) |
70 ～ 75 |
|
| (hemp) |
70 ～ 80 |
|
| (cotton) |
90 ～ 95 |
|
Cellulose ether
Cellulose ethers refer to cellulose derivatives in which some or all of the hydroxyl groups on cellulose are substituted by ether groups.
Types of cellulose ethers in the field of building materials
HEC: Hydroxyethyl Cellulose Ether; Hydroxyethyl Cellulose
MC: methyl cellulose ether; Methyl Cellulose
CMC: Sodium Carboxymethyl Cellulose; Carboxyl Methyl Cellulose
MHEC: Methyl Hydroxyethyl Cellulose Ether; Methyl Hydroxyethyl Cellulose
MHPC: Methyl Hydroxypropyl Cellulose Ether; Methyl Hydroxypropyl Cellulose
How to evaluate the quality of cellulose ether
|
project |
technical requirement |
||||||
|
MC |
HPMC |
HEMC |
HEC |
||||
|
E |
F |
G |
K |
||||
|
Exterior |
White or light yellow powder, no obvious coarse particles and impurities |
||||||
|
Fineness% |
8.0 |
||||||
|
Loss on drying % |
6.0 |
||||||
|
Sulfated Ash% |
2.5 |
||||||
|
viscosity |
Nominal viscosity value (-10%, +20%) |
||||||
|
PH value |
5.0~9.0 |
||||||
|
Transmittance% |
80 |
||||||
|
gel temperature |
50~55 |
58~64 |
62~68 |
68~75 |
70~90 |
≥75 |
—— |
|
Methoxy content% |
27~32 |
28~30 |
27~30 |
16.5~20 |
19~24 |
24.5~28 |
—— |
|
Hydroxypropoxy content% |
— |
7.0~12.0 |
4.0~7.5 |
23.0~32.0 |
4.0~12.0 |
— |
|
|
Hydroxyethoxy content% |
— |
— |
— |
— |
— |
1.5~9.5 |
|
Characteristics of cellulose ether in mortar
|
water retention |
||
|
affect bonding time |
MC |
thickening |
|
enhance adhesion |
The main influencing factors of MC water retention
Water retention
|
viscosity |
Amount added |
the size of granule |
|
higher viscosity The higher the water retention rate |
The higher the amount added The higher the water retention rate |
The finer the particles The faster the dissolution rate, the faster the water retention |
Effect of MC on Mortar Consistency
Consistency Control
|
degree of modification |
the size of granule |
viscosity |
|
best handling performance The higher the degree of modification The better the anti-slip effect more efficient |
The finer the particles Get consistency faster |
For unmodified products: The higher the viscosity, the higher the amount added The thicker the better |
Post time: Feb-06-2023