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Study On Storage Stability Of Polycarboxylate Superplasticizer Mother Liquor
Blog Study On Storage Sta
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The solid content of polycarboxylate superplasticizer refers to the percentage of non-volatile effective solid components in the total mass of the product, which is the core indicator for measuring the content of effective components in superplasticizers. The composition of solid active ingredients varies depending on the product form.
During the synthesis, water serves only as a solvent and does not participate in the reaction. The solid mass in the mother liquor is entirely derived from the reaction raw materials. The core components include polyether monomers (TPEG, HPEG, etc., which form the product’s core skeleton), acid monomers (acrylic acid, etc., which provide anchoring groups), initiators, chain transfer agents, trace catalysts, and other additives.
Composed of PCE liquid mixed with various functional small materials, the solid component is the sum of the effective ingredients of the mother liquor and functional additives such as retarders, air entraining agents, defoamers, preservatives, etc., suitable for various on-site construction needs.
PCE powder prepared by the bulk polymerization process has no moisture and a solid content of over 98%, up to 100%.
The solid content directly determines the proportion of effective ingredients in water-reducing agents, profoundly affecting the performance, construction effect, mixing process, and usage cost of concrete. It is not necessarily better to have a higher solid content. It needs to be adapted according to needs.
The high or low solid content determines the product’s sensitivity to dosage and water consumption, directly affecting the stability of the construction. Products with high solid content are highly sensitive, and small fluctuations in dosage or water consumption can easily cause problems such as concrete bleeding, segregation, and pipe blockage. In addition, viscosity is prone to sudden increases at low temperatures, making storage and transportation more difficult, and it is only suitable for high-strength concrete construction.
Low-solid-content products (commonly used at 8%~10%) have low sensitivity, and when sand and gravel moisture content fluctuates, concrete workability is more stable, making on-site construction easier to control and suitable for medium to low-strength concrete.
The solid content serves as the basis for the compounding process of water-reducing agents. By adjusting the ratio of different solid-containing mother liquors with high water reduction and high water retention, it can adapt to the construction needs of different weather conditions and customers. But when the solid content is too high, the product is too sensitive to moisture, and the difficulty of functional regulation is greatly increased.
Liquid high-solid-content products have high effective ingredients but higher transportation and sealed storage costs; powder products have no moisture, a small volume, and are not easily frozen, greatly reducing long-distance transportation costs and are suitable for use in cold regions. However, due to the additional drying process, production costs are higher, and the selling price is higher as well.
The optimal solid content of polycarboxylate superplasticizer needs to be selected based on practical scenarios: high-strength concrete should prioritize high solid content products to ensure water reduction and strength performance; For scenarios involving medium to low strength concrete, large fluctuations in raw materials, or complex construction environments, low solid content products are preferred to balance construction stability and practicality, achieving the optimal balance between performance, construction, and cost.
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