KingmaxCell® MHEC LH 620M, a non-ionic cellulose ether, is utilized in construction projects due to its beneficial properties of dispersion, water retention, bonding, and thickening. The incorporation of cellulose ether can notably enhance the water retention of gypsum. However, as the content of cellulose ether increases, there is a slight decrease in the flexural and compressive strengths of the hardened gypsum body. This reduction can be attributed to the air-entraining effect of cellulose ether, leading to the introduction of bubbles during slurry stirring, subsequently diminishing the mechanical properties of the hardened body. Simultaneously, an excess of cellulose ether can result in excessive viscosity of the gypsum mixture, leading to decreased workability.

Where to buy Cas MHEC LH 620M

Product Detail

Product Tags

Specification of MHEC LH 620M

Chemical name Methyl Hydroxyethyl Cellulose
Synonym Cellulose ether, 2-hydroxyethyl methyl cellulose, Cellulose, 2-hydroxyethyl methyl ether, hydroxyethyl Methyl cellulose, MHEC, HEMC
CAS number 9032-42-2
Brand EipponCell
Product Grade MHEC LH 620M
Solubility Water Soluble Cellulose ether
Physical form White to off-white cellulose powder
Moisture Max.6%
PH 4.0-8.0
Viscosity Brookfield 2% solution 10000-20000mPa.s
Viscosity NDJ 2% solution 16000-24000mPa.S
Ash content Max5.0%
Mesh size 99% pass 100mesh
HS code 39123900

Application of MHEC LH 620M

EipponCell MHEC LH 620M methyl hydroxyethyl cellulose is utilized in gypsum slurry to provide a noticeable thickening effect. At room temperature, as the viscosity and dosage of cellulose ether increase, its thickening effect becomes more pronounced. However, as the temperature rises, the viscosity of cellulose ether decreases, resulting in a weakening of its thickening effect. This leads to a decrease in yield shear stress, plastic viscosity, and pseudoplasticity of the gypsum mixture, ultimately resulting in poor workability.

Cellulose ether enhances the water retention of gypsum. However, as the temperature increases, the water retention of modified gypsum significantly decreases and even completely loses its water retention improvement effect at 60 °C. The water retention rate of gypsum slurry is significantly improved by cellulose ether, and the water retention rate gradually reaches a saturation point with the increase in content for HPMC modified gypsum slurry with different viscosities. Generally, the water retention of gypsum is proportional to the viscosity of cellulose ether, but it has little effect at high viscosity.

The changes in water retention of cellulose ethers with temperature are closely related to the microscopic morphology of cellulose ethers in the liquid phase. At a certain concentration, cellulose ether tends to aggregate and form large colloidal associations, effectively blocking the water delivery channels of the gypsum mixture to achieve efficient water retention. However, as the temperature rises, the thermal gelation properties of cellulose ether cause the previously formed large colloidal associations to re-disperse, resulting in a decrease in water retention.

Documents of MHEC LH 620M

Recommended HEMC for Building & Construction

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