The tensile strength and cohesion of the polymer resin film formed by the latex powder are enhanced. due to the flexibility of the polymer. The deformation ability is much higher than that of cement stone rigid structure. The deformation properties of the mortar are improved. The effect of dispersing stress is greatly improved. Thereby improving the crack resistance of the mortar.
With the increase of the content of redispersible polymer powder. The whole system is developing in the direction of plastic. In the case of high latex powder content. The polymer phase in the cured mortar gradually exceeds the inorganic hydration product phase. Mortar will undergo a qualitative change. become elastic. At the same time, the hydration product of cement becomes a kind of “filler”.
The tensile strength, elasticity, flexibility and sealability of the mortar modified by redispersible polymer powder are all improved. The blending of redispersible polymer powders allows the polymer film (latex film) to form and form part of the pore walls. Thus, the high porosity structure of the mortar is closed.
The latex membrane has a self-stretching mechanism that exerts tension where it is anchored to the mortar. The mortar is held together as a whole by these internal forces. Thereby increasing the cohesive strength of the mortar. The presence of highly flexible and highly elastic polymers improves the flexibility and elasticity of the mortar.
The mechanism for the increase in yield stress and failure strength is as follows:
Microcracks are delayed due to improved flexibility and elasticity when force is applied. It does not form until higher stresses are reached. In addition, the interwoven polymer domains also hinder the coalescence of microcracks into penetrating cracks. Therefore, the redispersible polymer powder improves the failure stress and failure strain of the material.
The polymer film in polymer modified mortar has a very important effect on hardening mortar. The redispersible polymer powder distributed on the interface plays another key role through dispersion and film formation. That is, the adhesion to the material in contact is increased.
In the microstructure of the powder polymer modified tile bonding mortar and tile interface, the film formed by the polymer forms a bridge between the vitrified tiles with extremely low water absorption and the cement mortar matrix. The area of contact between two dissimilar materials is a particularly high risk area for shrinkage cracks to form and lead to loss of cohesion. Therefore, the ability of latex films to heal shrinkage cracks is of great importance for tile adhesives.
At the same time, the redispersible polymer powder containing ethylene is especially similar to the organic substrate. Such as polyvinyl chloride, polystyrene and other bonding force is more prominent. This is a good example when polymer modified dry powder mortar is used for bonding and covering of polystyrene boards.
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Mechanism of Redispersible Polymer Powder in Dry Mix Mortar (1)
Mechanism of Redispersible Polymer Powder in Dry Mix Mortar (2)