Polycarboxylate Superplasticizer Market

In recent years, polycarboxylate superplasticizers, with their superior performance and pollution-free production, have developed rapidly abroad. Especially in Japan, where the ratio of polycarboxylic acid to naphthalene has exceeded 7:3. Polycarboxylic acid superplasticizers are very different from traditional superplasticizers in terms of molecular structure, action principle and behavior in concrete. Therefore, correct understanding and rational use are the important links to promote the application of polycarboxylate superplasticizers.

Polycarboxylate superplasticizer is a kind of surfactant whose molecular structure contains carboxylic graft copolymer. It has a high and relatively long water-reducing effect in concrete. Dozens of surfactants with the above molecular structure characteristics can be found in domestic and foreign literature, including: maleic acid (ester) graft copolymer, acrylic acid graft copolymer, terminal sulfonate graft copolymer, unsaturated polyether graft copolymer and so on. All these copolymers form a "comb" or "dendritic" branch chain structure, but the difference is the length, stiffness, shape, polarity, and so on.

Because of this, different molecular structure of polycarboxylic acid graft copolymers on cement particles adsorption, dispersion is not exactly the same, especially for different components, different size of the particles are not the same. Polycarboxylate superplasticizer product is to select one or several copolymers or copolymers with different molecular weights) to achieve maximum dispersion of various colloidal material particles.

Polycarboxylate superplasticizer has a great potential for high performance due to its high degree of freedom in molecular structure and many parameters controlled by manufacturing technology. At present, foreign department of poly carboxylic acid water reducing agent with the commercialization of varieties, and the related research in the basic theory, especially the advanced instruments such as the use of the synthetic polymer molecular mass classification and determination, using high performance liquid chromatography (HPLC) to study the adsorption of the polymer in the cement system used in chemical structure, such as impact on the performance and mechanism of action research, that is difficult to determine original embodiment of many chemical structure information, the results tend to be more objective and quantitative, water reducing agent of ideal performance guiding role in the development of the work will be stronger. Kingsun can supply high-quality PCE admixture, welcome to visit kingsun website: kingsunconcreteadmixtures.com.

Application technical problem

Adaptability of cement: The components of cement and gelatinized materials are complex and changeable. From the perspective of adsorption and dispersion mechanism, it is impossible to find a water-reducing agent suitable for everything. Therefore, although polycarboxylic acid high-performance water-reducing agent has a wider adaptability than naphthalene system, it may still have poor adaptability to part of cement. Most of these adaptations are reflected in reduced water loss rates and increased slump losses, either both, or only one. When the ball is ground to different fineness of the same cement, the action of the water-reducing agent will be different. You may find more relate articles on my Facebook: https://www.facebook.com/Kingsun-Concrete-Chemicals/, welcome to follow.

There are three solutions to adaptation:

A. It is more effective to increase the dosage appropriately, especially to adopt the lagged admixture method.

B. Appropriate addition of other components, especially in the case of a large slump loss, adding some traditional retarder components, can mostly improve.

C. It is often possible to change the polymer composition and adjust some components in the synthesis process to make it completely adaptable.

Compatibility effect: Cement particles have selectivity in adsorption of polymer materials. Therefore, there is a problem of matching between different water-reducing agent components or different water-reducing agents when they are mixed.

Gas content: From the point of view of pumpability and durability, it is beneficial to increase the causability appropriately. Many high-performance polycarboxylic acid water-reducing agents in Japan have relatively high air entrapment. When no air entrapment is needed, anti-foam components should be added. In the molecular design and process selection of polycarboxylate superplasticizer, the basic range of its air entrainability can be selected.

With the rapid development of China's economic construction and the cross-industry cooperation between cement admixtures researchers and polymer synthesizers, polycarboxylic acid superplasticizer has completely replaced the traditional naphthalene superplasticizer in this field. Moreover, the production cost has been reduced to a certain extent.