Why add hydroxypropyl methyl cellulose in mortar?
May 7th 2024
The effect of the content of redispersible latex powder RDP on the compression ratio of the polymer mortar itself indicates that the polymer improves the toughness of the mortar. The weighted average of each relevant point can quantitatively analyze the influence level of the redispersible polymer powder content on the performance of the polymer mortar itself, with the increase of the redispersible polymer powder content. The compressive strength, flexural strength and compression-to-fold ratio of the polymer mortar have a linear decreasing trend.
For each increase of 1% of redispersible latex powder, the compressive strength decreases by 1.21MPa and the flexural strength decreases by 0.14MPa and the compression-folding ratio decreases by 0.18. It can also be seen that due to the increase in the content of redispersible latex powder, there are 5 curves with The amount of cement increases and moves up in parallel.
To choose a suitable dispersible polymer powder, the following main aspects should be considered.
1. The glass transition temperature of the redispersible polymer powder is a main indicator of the physical properties of the redispersible polymer powder. For a specific product, the reasonable choice of the glass transition temperature of the redispersible polymer powder is conducive to enhancing the flexibility of the product and avoiding problems such as cracking.
2. Minimum film-forming temperature. After the redispersible polymer powder is mixed with water and re-emulsified, it has similar properties to the original emulsion, that is, a film will be formed after the water evaporates. The film has high flexibility and excellent adhesion to a variety of substrates.
3. Redissolvable properties. Inferior dispersible polymer powders are partially or hardly dissolved in cold water or alkaline water.
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