Chemical Raw Material

pce polycarboxylate superplasticizer is one of the most popular plasticizing materials for concrete. It can be used for a variety of concrete systems, such as high performance concrete, high flowability concrete, high durability concrete, dry mortar, waterproof mortar, self-leveling floor, joint filler and grouts etc. It also can be used to reduce the water content of gypsum products and ceramic products to improve their strength and properties.

Description of pce polycarboxylate superplasticizer

Usually, PCE is a comb-type polymer with an anionic backbone and several nonionic pendant chains. Its water-reducing performance is mainly determined by the molecular structure and can be enhanced by adding long side chains of different polymer structures such as carboxyl groups.

Hyperbranched polycarboxylate based (HBPCE) is a novel hyperbranched PCE which has been synthesized through a two-step synthesis using diallylamine, methyl propenoate and trihydroxymethylpropane as the primary raw materials, and p-toluenesulfonic acid as a catalyst. After copolymerization of a methylallylpoly oxygenethene ether 2400, an AA monomer and the hyperbranched monomer B in aqueous solution, HBPCE was obtained.

Synthesis and characterization of this new type of PCE with hyperbranched molecular structure was performed by using a combination of size exclusion chromatography, 1H/13C NMR, FT-IR spectroscopy and heat flow calorimetry. The results showed that HBPCE has a broader molecular weight distribution and higher dispersion effectiveness in the cement paste than common PCE, which largely accounts for its excellent water-reducing performance.

Furthermore, we investigated sulfate tolerance of this new hyperbranched PCE by performing mini slump tests in which the sample was dissolved in a mixture of water and varying amounts of a-, b-hemihydrate, and alkali sulfates. We found that HBPCE has better sulfate resistance than other aqueous-phase PCEs.