polycarboxylate superplasticiz Instructions
The water reducing agent is environmentally friendly, non-flammable, non-explosive and safe for rail and automobile transportation.
According to the differences in backbone structures, polycarboxylic acid superplasticizer products can be divided into two categories: using acrylic acid or methacrylic acid as backbone types and grafting polyethers with different side chain lengths. Others are polyethers whose main bond is maleic anhydride and which have different side chain lengths. Based on this, several highly water-reducing products with different properties were derived.
Synthesis of polycarboxylate superplasticizer
Prior to the formation of the polycarboxylate dehydrating agent, it was necessary to reconstitute the supernatants from the polycarboxylate supernatants. It has the advantages of low dosage, good droplet stability, low concrete shrinkage, high controllability of molecular structure and high potential for high performance. Significant advantages such as the absence of formaldehyde in the process.
For the synthesis of a polycarboxylate water reducing agent, the design of the molecular structure is crucial, including the main group, the side chain density, and the length of the side chain in the molecule. . . The synthesis methods mainly include an in situ polymerization graft method, a first polymerization method, then a functionalization method, and a direct monomer copolymerization method.
Use of polycarboxylate superplasticiz
For many concrete projects, conventional high-performance concretes such as B. the naphthalene series, which do not meet the project requirements due to technical performance limitations. A new generation water reducing agent, a high-performance water reducing agent, polycarboxylate water, which has attracted a lot of attention at home and abroad because it has developed an effective molecular structure based on truly disperse cement mechanism and super spreading. Outside. It can prevent concrete from settling without appreciable delay, and it prevents concrete from settling because it has greater softening effect at low concentration, good flow retention, high cement content, high molecular weight and high pore elimination for application on a variety of plastics can offer. be appropriate techniques. , good strength development, excellent durability and effective polycyclic acid water reducer. Arboxylic has comprehensive technical advantages and environmental protection properties that meet the needs of modern concrete technology. Therefore, water-reducing polycarboxylate high-performance water reducing agents are increasingly used to produce high-performance concrete. It is reported that the use of polycarboxylic acid additives accounts 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 successfully used in the Three Gorges Dam, Sutong Bridge, Tianwan Nuclear Power Plant, Beijing-Shanghai High-Speed Railway and other railway systems. and important national energy. Projects that produce significant results.
