Tips of application of polycarboxylate high-performance water reducer(III)： Polycarboxylate Superplasticizer produced by in-situ polymerization process
Solid Polycarboxylate Superplasticizer on the market include powder polycarboxylate superplasticizer produced by high-temperature spray drying (SJZ-101/ 401/ 018) and solid polycarboxylate superplasticizer produced by in-situ polymerization.
It is easy to understand that the performance of powder polycarboxylate superplasticizer produced by high-temperature spray drying is very similar to that of mother liquor. Here, we will briefly introduce the polycarboxylate superplasticizer produced by in-situ polymerization process(SJZ-20：PCE Flake/Granular).
In-situ polymerization is a polymerization reaction initiated by initiators or self-initiated by light, heat, or radiation of monomers without solvents or other dispersants. Sometimes, a small amount of colorant, plasticizer, or molecular weight regulator can be added. Liquid, gas, and solid monomers can be used for in-situ polymerization. The advantages of in-situ polymerization are pure products, which can be directly cast and formed; high utilization rate of production equipment, simple operation, and no need for complex separation and purification operations. It requires less investment, has a large effective reaction volume in the reactor, has a large production capacity, is easy to be continuous, and has low production cost.
If the production cost is low and the effect is the same, it will be a perfect product. Unfortunately, the substance obtained by the in-situ polymerization process does have a certain water reduction rate, but as a water reducer, it cannot achieve the performance of the solution-form mother liquor. Experimental results have shown that the Polycarboxylate Superplasticizer produced by in-situ polymerization process performs well in cement slurry, but there is a big gap between it and ordinary superplasticizer mother liquor in mortar. Through the comparison of cement slurry flowability and concrete compatibility testing, the performance of the in-situ polymerization synthesized solid polycarboxylate superplasticizer is lower than that of normal Polycarboxylate Superplasticizer mother liquor. It is hoped that new synthetic processes will be developed in the future to improve the effectiveness of in-situ polymerization synthesized Polycarboxylate Superplasticizer.
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