The advanges of HPMC & MHEC in dry mix mortar products
November 22nd 2024
Redispersible polymer powder features and applications in dry mix mortar
-One of the important additives for dry mix mortar industry. Improve various performance of different kinds dry mix mortar products.
Redispersible polymer powder features and applications in dry mix mortar
1.The content of redispersible polymer powde
The content of redispersible polymer powder include: polymer powder, additives, protection colloid and anti-caking agent.
(1) polymer powder: It is the key content of redispersible polymer powder and provide the key properties of redispersible polymer powder in applications. For example RDP products is based on VEA(vinyl ethylene acetate copolymers).
(2)Protection colliod: It is a kind of hydrophilic material covered on the surface of polymer powder. RDP use PVA as the protection colloid.
(3)Additives: in order to reach a specific functions in dry mix mortar formulation, it is required to add other additives in redispersible polymer powder some time.
Not all the redispersible polymer powder contain additives.
(4)Anti-caking agent: It is required to add in all kinds of redispersible polymer powder, it could prevent redispersible polymer powder from clumping and improve the fluidity. It is mineral filler. It shows as the ash content in documents. Normally, the ash content of RDP is 12±2% or 18±2% as per customers’ requirements.
2. The features of redipserible polymer powder in dry mix mortar.
(1) RDP features in wet mortar
Redispersible polymer powder make contributions to improve construction performance, improve flow performance, increase thixotropy and sag resistance, improve cohesion, extend open time and enhance water retention. Normally, adding redispersible polymer powder is helpful to increase the open time of wet mortar.
(2)Redispersible polymer powder in Cement dry mix mortar hydration
Redispersible latex powder can increase the tensile strength of the mortar, enhance the strength, improve the flexibility of the mortar, enhance the abrasion resistance, increase the cohesive strength and reduce the water absorption of the material
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