Polycarboxylic Acid Water Reducer is an effective water reducing agent and cement dispersant in cement concrete applications. It is widely used on roads, bridges, dikes, tunnels, skyscrapers and other projects.
The water-reducing agent is environmentally friendly, non-flammable, explosive and can be transported safely in trains and cars.
Depending on the difference in body structure, polycarboxylate acid superplasticizer products can be divided into two categories: one type uses acrylic acid or methacrylic acid as the backbone and grafts polyethers with different side chain lengths. The others are polyethers whose main bond is maleic anhydride and which have different side chain lengths. Based on this, several high-performance water-reducing products with different properties were derived.
Prior to the formation of polycarboxylate water reducing agent, there was a need to regenerate the supernatant supernatants of polycarboxylate supernatants. It has the advantage of low dosing, good droplet retention, low concrete shrinkage, high controllability of the molecular structure and high potential for high performance. Significant advantages, such as the absence of formaldehyde in the process.
For the synthesis of a water-reducing agent of a polycarboxylate water reducing agent, the design of the molecular structure is very important, including the backbone group, the side chain density, and the side chain length in the molecule. The synthetic methods mainly include the in situ polymerization grafting method, first the polymerization and then the functionalization method, and the direct monomer copolymerization method.
In many concrete projects, traditional high-efficiency concretes, such as the naphthalene series, are increasingly unable to meet project needs due to technical performance constraints. A new generation water-reducing agent that has attracted a lot of attention at home and abroad, polycarboxylate water reducing agent high-performance water-reducing agent, because it really designed an effective molecular structure based on the dispersed cement mechanism, is superdispersed. type and can avoid concrete sagging without apparent delay, as it can provide a greater softening effect with low concentration, good fluidity retention, high degree of freedom for cement to adapt to a variety of multi-molecular synthesis techniques and large space for high performance shrinkage of the concrete, the content of harmful substances is very low and other technical performance characteristics that give the concrete excellent workability, good strength development, excellent durability and high-performance polycyclic acid-based water-reducing agent. Arboxylic has good Comprehensiv Technical advantages and environmental protection properties meet the needs of modern concrete technology. Therefore, polycarboxylate water reducing agent high-performance water-reducing agents are gradually becoming a preferred mixture for the production of high-performance concrete. According to reports, the use of polycarboxylic acid additives accounted for more than 80% of all high-performance additive products in Japan, and more than 50% in North America and Europe. In my country, polycarboxylate water-reducing agents have only been used successfully in the Three Gorges Dam, the Sutong Bridge, the Tianwan Nuclear Power Plant, the Beijing-Shanghai High-Speed Train and other large-scale national water protection systems, bridges, nuclear power and railways. projects with significant results.