Hydroxypropyl Methylcellulose (HPMC) can provide longer open time, improved adhesive strength and slip-resistance properties, as well as excellent workability for the tile adhesives.
Hydroxypropyl Methyl Cellulose (HPMC) or Hypromellose is a water-soluble, non-ionic cellulose ether made from natural polymer material cellulose through a series of etherification. It has the characteristics of thickening, dispersion, emulsification, film formation, suspension, adsorption, surface activity, moisture retention and protective colloid.
|HPMC||Hydroxypropyl Methylcellulose (HPMC)|
|Dry Loss, WT%||≤5|
|Methyl Content, WT%||28.0-30.0|
|Hydroxypropyl Content, WT%||4.0-12.0|
|Ph(1% solution, 25ºC)||7.0±1.0|
|Gel Temperature ºC||58-65|
|Viscosity (2% solution, 20ºC)||1000-200000CPS|
Hydroxypropyl Methyl Cellulose (HPMC) is used very often as a thickener in building applications as it prevents segregation and improves the cohesion of the formulation components. In dry mix mortar, the thickening power is related to their solution viscosity. The addition of HPMC imparts excellent stickiness to wet mortar. That can significantly increase the adhesion of wet mortar to the base layer and improve the sag resistance of the mortar.
Hydroxypropyl Methyl Cellulose (HPMC) can effectively prevent too fast and low penetration of water into the base surface in cement-based products, allowing more water to stay in the mortar and participate in the cement hydration reaction. HPMC has a stable water retention capacity in a wide temperature range, although changes in ambient temperature will affect its water retention capacity. Some special grades of products can still work well in high-temperature environments. In gypsum-based and ash-calcium-based products, cellulose ethers also play an important role in ensuring their open time and strength development.
Hydroxypropyl Methyl Cellulose (HPMC) can significantly increase the thixotropic properties of the mortar system, which allows the mortar with excellent anti-sagging ability, thereby improving construction efficiency, especially when building on walls. The good sag resistance of the mortar means that there will be no slippage when the mortar is constructed with a considerable thickness; for the tile pasting project, it means that the tiles pasted to the wall will not be displaced due to gravity.