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修改這篇文章 : What is polycarboxylate superplasticizer?

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The molecules of polycarboxylic acid (salt) water reducer are artificially formed “comb” or “dendritic” structure through “molecular design”, and there are many branches with a certain length and rigidity connected to the main chain of the molecule ( Side chain). There are also sulfonates or other groups on the main chain that can charge the cement particles, which can function as a traditional water-reducing agent. More importantly, once the main chain is adsorbed on the surface of the cement particles, the branch chain and the surface of the other particles The branches form a three-dimensional cross, which prevents the particles from approaching each other, thereby achieving dispersion (ie, water reduction). This steric hindrance does not weaken with time, so the dispersion of polycarboxylic acid water reducer is more durable. Polycarboxylic acid water reducer is a molecular structure designed by hand. It has a high proportion of active ingredients and a concentrated molecular weight range. Therefore, compared with other water reducers, polycarboxylic acid water reducer not only has a high water reduction rate, but also maintains slump for a long time. , And the dosage is smaller. Due to the high technical advantages of polycarboxylic acid water reducer, it has become a representative variety of a new generation of water reducer that is being developed worldwide. In commercial concrete, polycarboxylic acid water-reducing agent has replaced the position of naphthalene-based water-reducing agent. Polycarboxylic acid-based high-performance water-reducing agent is the third-generation high-performance water-reducing agent developed after the common water-reducing agent represented by wood calcium and the high-efficiency water-reducing agent represented by naphthalene system. It is currently the most advanced in the world. , A high-efficiency water reducer with the highest technology content, the best application prospects and the best comprehensive performance.

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