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Working Mechanism of Redispersible Polymer Powder(RDP)
Dispersible polymer powder is physically mixed with other inorganic binders(such as cement, slaked lime, gypsum, clay, etc) and various aggregates, fillers and other additives such as Hydroxypropyl Methylcellulose(HPMC), polysaccharide(starch ether) and cellulose, finally to produce mortar.
When the dry mortar is added to the water and stirred, the rubber powder particles are dispersed into the water under the action of the hydrophilic protective colloid and mechanical shearing force. The time required for the dispersion of the normal dispersible polymer powder is very shot. For example, in the dry-sprayed concrete repair mortar, the dry mortar with Redispersible Polymer Powder and the water are sprayed only at the end of the nozzle for about 0.1s. To the construction surface, this is sufficient to fully disperse and film the redispersible powder.