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Polycarboxylate superplasticizer (PCE) is an environmentally friendly and highly compatible dry powder product that is chlorine-free, low-alkali, and formaldehyde-free. As the third-generation high-performance concrete admixture, it was initially widely used in cement-based materials. In recent years, with the technological upgrade of dry-mixed mortar products such as tile adhesives, polycarboxylate high-efficiency water reducers have been introduced into tile adhesive formulations due to their excellent dispersibility and low dosage with high water reduction rate, to optimize their working performance and mechanical strength.

Core mechanism of action:

Polycarboxylate superplasticizer, through its unique molecular structure – the main chain adsorbs onto the surface of cement particles, and the side chain forms a steric hindrant effect, effectively dispersing the cementitious material particles, reducing agglomeration, and thereby improving the fluidity and uniformity of the mortar system. In tile adhesive, this mechanism not only enhances the workability of the slurry but also strengthens the interfacial bonding force between the base layer and the tiles, which is specifically manifested in the following aspects:

1. Water reduction and dispersion: It can fully disperse cement particles and powder aggregates through the steric hindrance effect, significantly reducing the water requirement for mixing tile adhesive. Even at a low water-binder ratio, it can still endow the slurry with excellent fluidity, enhance the density of the cementitious system, and reduce internal pores.
2. Enhance bonding durability. Polycarboxylate superplasticizer works in synergy with other components (such as redispersible latex powder and cellulose ether) to enable the tile adhesive to more thoroughly wet the back of the tiles and the base material, enhance physical interlocking and chemical bonding, and significantly improve the bonding force. The dense microstructure can significantly enhance the bonding strength between the tile adhesive and the tiles as well as the base layer, while alleviating the drying shrinkage during the curing stage and preventing diseases such as hollowing and cracking.
3. Optimize construction performance, improve the workability of tile adhesive, and significantly increase the open time and adjustment time of tile adhesive; Reduce the amount of water added while maintaining good fluidity to avoid sagging or sliding caused by excessive water. Make the slurry smooth without stringing or sticking to the wall, and have good anti-sagging ability, delay the loss of slump, and ensure good workability even after long-term construction. It is suitable for laying large-sized tiles and improves construction efficiency.

In terms of application advantages, excellent form adaptability is the primary feature. The powder form can be evenly mixed with the dry powder of tile adhesive without the need for additional liquid-making equipment, making it suitable for the entire process of production, storage and transportation of pre-mixed dry powder. Secondly, it has good component synergy and is compatible with commonly used components of tile adhesives such as cement, gypsum, and cellulose ether. It will not cause problems such as delamination and bleeding, and its performance is less affected by environmental temperature and humidity. In addition, it can also reduce the overall cost. With a high water reduction rate, it can decrease the amount of cementitious materials used. Meanwhile, its stable performance can lower the rate of construction rework, taking into account both technical and economic value.

In conclusion, polycarboxylate superplasticizer (PCE), an environmentally friendly and highly compatible dry powder product, can significantly enhance the adhesion, fluidity, strength and durability of tile adhesives, and is a key additive in high-performance tile adhesives.