Polycarboxylate superplasticizer 8

11 month ago

4 0

Shanghai Hongyun New Construction Materials Co., Ltd

 13 month year

Product details

Action mechanism of water reducing agent

Steric hindrance effect

In the cement slurry mixed with high performance superplasticizer, the long chain of organic molecules of high performance superplasticizer actually shows various adsorption states on the surface of cement particles. The different adsorption states are caused by the different molecular chain structure of superplasticizers, which directly affects the temporal variation of slump of concrete mixed with such superplasticizers. Studies have shown that the adsorption state of naphthalene series and melamine series water reducer is rod-like chain, so it is a flat adsorption, and the electrostatic repulsion is weak. The result is that the Zeta potential decreases rapidly, the electrostatic balance is easy to be destroyed with the development of cement hydration process, so that the van der Waals gravity dominates and the slump changes greatly over time. On the surface of cement particles, the sulfinic acid superplasticizer molecules are adsorbed in a ring, lead line and gear shape, which makes the electrostatic repulsion of cement particles show a three-dimensional cross-cross type. The Zeta potential of the three-dimensional electrostatic repulsion has a small change in time, and the macro performance is better dispersibility and small slump change in time. The adsorption state of polycarboxylic acid grafted copolymer superplasticizer macromolecules on the surface of cement particles is mostly toothed. The water-reducing agent not only has excellent dispersion to cement particles but also can keep slump change little. There are three reasons: First, there are a lot of carboxyl groups in graft copolymer. It has a certain chelating ability and the stereostatic repulsion of the chain constitutes an obstacle to the agglomeration of particles. The second reason is that in the strong alkaline medium such as cement slurry, the graft copolymerization chain is gradually broken and carboxylic acid molecules are released, so that the first effect of the above is constantly paid attention to. Third, the absolute value of Zeta potential of graft copolymer is lower than that of naphthalene series and melamine series water reducer, so the total charge required to achieve the same dispersion state is not as much as that of naphthalene series and melamine series water reducer. For polycarboxylic acid superplasticizers with side chains and sulfamate superplasticizers, the stability of the dispersion system can be maintained through this stereoscopic repulsive force.

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Shanghai Hongyun New Construction Materials Co., Ltd

 Audited supplier

13 month

Address: Shanghai, China

Main Product: polycarboxylate superplasticizer, polycarboxylate superplasticizer powder, PCE plasticizer, water reducer, PCE superplasticizer, water reducing agent

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