Effect of cellulose ether on gypsum mortar

Hydroxypropylmethylcellulose

1. It is stable to acids and alkalis, and its aqueous solution is very stable in the range of pH=2~12. Caustic soda and lime water do not have much impact on its performance, but alkali can speed up its dissolution and slightly increase its viscosity.

2. HPMC is a highly efficient water-retaining agent for dry mortar systems. It can reduce the bleeding rate and delamination degree of mortar, improve the cohesion of mortar, effectively inhibit the formation of plastic cracks in mortar, and reduce the plastic cracking index of mortar.

3. It is a non-ionic and non-polymer electrolyte that is very stable in aqueous solutions containing metal salts and organic electrolytes. It can be added to building materials for a long time to ensure improved durability.

4. The working performance of the mortar is significantly improved. The mortar seems to be “oily”, which can make the wall joints full and the surface smooth, so that the mortar and the base layer are firmly bonded, and the operation time can be extended.

water retention

Achieve internal maintenance, which is conducive to long-term strength improvement

Suppress bleeding and prevent mortar settlement and shrinkage

Improve the crack resistance of mortar.

Thickening

Prevent segregation and improve mortar uniformity

Improve wet bonding strength and sag resistance.

Air entrainment

Improve mortar working performance

As the viscosity of cellulose becomes higher and higher, the longer the molecular chain becomes, the more obvious the air-entraining effect becomes.

Slow setting

Synergizes with water retention to extend the opening time of mortar.