Additives in Mortar – Cellulose Ether


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 etherRedispersible 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

 

WhatsApp Online Chat !