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Influence of Hydroxypropyl Methyl Cellulose on Water Retention Performance of Wet-mixed Mortar

2021-04-01

Water retention is an important property of hydroxypropyl methylcellulose HPMC, and it is also the performance of many wet-mix mortar manufacturers. The factors that affect the water retention effect of wet-mixed mortar include the amount of HPMC added, the viscosity of HPMC, the fineness of particles and the temperature of the environment in which it is used.

The important role of hydroxypropyl methyl cellulose HPMC in wet-mixed mortar is mainly manifested in three aspects, one is its excellent water retention performance, the other is its influence on the consistency and thixotropy of wet-mix mortar, and the third is its interaction with cement .

1) The water retention effect of cellulose ether depends on the water absorption of the base layer, the composition of the mortar, the thickness of the mortar, the water demand of the mortar and the setting time of the solidified material. The higher the transparency of hydroxypropyl methylcellulose, the better the water retention.

2) Factors affecting the water retention of wet-mixed mortar include cellulose ether viscosity, addition amount, particle fineness and use temperature. The higher the viscosity of the cellulose ether, the better the water retention. Viscosity is an important parameter of HPMC performance. For the same product, the viscosity results measured by different methods are very different, and some are even twice the difference. Therefore, when comparing the viscosity, it must be carried out between the same test methods, including temperature, rotor, etc. Generally speaking, the higher the viscosity, the better the water retention effect; the higher the viscosity, the higher the viscosity of the wet mortar, and it will exhibit stickiness and high adhesion to the substrate when applied.

3) The more cellulose ether added in the wet-mixed mortar, the better the water retention, and the higher the viscosity, the better the water retention performance. Fineness is also an important performance index of hydroxypropyl methylcellulose. The fineness of hydroxypropyl methylcellulose also has a certain effect on its water retention. Generally speaking, for hydroxypropyl methylcellulose with the same viscosity and different denier, the finer the denier, the smaller the denier. Better water retention effect.

In the wet mixed mortar, the addition of cellulose ether HPMC is very low, but it can significantly improve the construction performance of the wet mixed mortar, which is the main influence on the construction performance of the mortar.

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