High performance polycarboxylate superplasticizer
Polycarboxylic Acid Water Reducer is an effective water reducer and cement dispersant in cement concrete applications. It is widely used in road, bridge, dike, tunnel, skyscraper and other projects.
The water reducing agent is environmentally friendly, non-flammable, explosive and safe to transport on trains and cars.
Depending on the different body structure, polycarboxylate superplasticizers can be divided into two categories: one type uses acrylic acid or methacrylic acid as the backbone and graft polyethers with different side chain lengths.
The others are polyethers whose main bond is maleic anhydride and which have different side chain lengths. From this, several high-performance water-reducing products with different properties were derived.
Prior to the formation of the polycarboxylate water reducing agent, there was a need to regenerate the supernatants from the polycarboxylate supernatants. It has the advantage of low dosage, good droplet retention, low concrete shrinkage, high ability to control molecular structure and high yield potential. Significant benefits such as the absence of formaldehyde in the process.
For the synthesis of a water-reducing agent from a polycarboxylate water-reducing agent, the design of the molecular structure including the backbone group, the side chain density and the side chain length in the molecule is very important. Synthetic processes mainly include an in situ graft polymerization process, a first polymerization process, then a functionalization process, and a direct monomer copolymerization process.
In many concrete projects, traditional high-performance concretes such as the naphthalene series are increasingly unable to meet the project requirements due to technical performance limitations.
A new generation water reducer, which has attracted a lot of attention at home and abroad, polycarboxylate water reducer, high performance water reducer, because it has really developed an effective molecular structure, based on the spreading cement mechanism, it is super common. Kind and can prevent concrete buckling without appreciable delay, because at low concentration it offers greater softening effect, good retention of fluidity.
High degree of freedom for the cement to adapt to a variety of multimolecular synthesis techniques, and plenty of room for strong concrete shrinkage, very low content impurities and other technical characteristics that give concrete excellent workability, good strength development, excellent durability and a powerful polycyclic acid water reducing agent.
Arboxyl has good comprehensive technical advantages and environmental protection properties that meet the needs of modern concrete technology. Therefore, polycarboxylate water reducing agent and high-performance water reducing agent are gradually becoming a preferred mixture for the production of high-performance concrete.
Polycarboxylic acid additives accounted for over 80% of all high performance additives in Japan and over 50% in North America and Europe. In my country, polycarboxylate water reducing agents have only been successful in the Three Gorges Dam, Sutong Bridge, Tianwan Nuclear Power Plant, Beijing-Shanghai bullet train and other major national water conservancy systems, bridges, nuclear power plants and railways. Projects with remarkable results.