Polycarboxylate Superplasticizer Advantages, Application, Production

Polycarboxylate Superplasticizer is a kind of high performance water reducing agent, which is a kind of cement dispersant used in cement concrete. It is widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects.

The product is green, non-flammable, non-explosive, and can be safely transported by train and car.

Product Description

According to the different structures of its main chain, the polycarboxylic acid high efficient water-reducing agent products can be divided into two categories: one type is based on acrylic acid or methacrylic acid as the main chain and grafted with different lengths of the side chain of the polyether. The other one is polyether with maleic anhydride as the main chain and grafted with different side chain lengths. Based on this, a series of high-performance water-reducing agent products with different characteristics have been derived.

Before the emergence of polycarboxylic acid additives, there are lignosulfonate additives, naphthalene sulfonate formaldehyde condensate, melamine formaldehyde condensate, acetone sulfonate formaldehyde condensate, aminosulfonate formaldehyde condensate, etc. In the early 1980s, Japan took the lead in the development of the polycarboxylic acid system of water-reducing agents. The new generation of a polycarboxylic acid, a highly efficient water-reducing agent, overcomes some of the drawbacks of the traditional water-reducing agent, with a low dosage, good slump-proof performance, low shrinkage of concrete, the molecular structure of the adjustability of the potential for high performance, the production process does not use formaldehyde, and other outstanding advantages.

Synthesis method: For the synthesis of a polycarboxylic acid water-reducing agent, the design of the molecular structure is crucial, which includes the main chain group, side chain density and side chain length in the molecule. Synthesis methods mainly include the in-situ polymerization and grafting method, first polymerization and then functionalization method and monomer direct copolymerization method.

1, in situ polymerization grafting method

Polyether is the medium of the unsaturated monomer polymerization reaction, so the main chain polymerization and the introduction of the side chain at the same time make the process simple. The quality of the synthesized water-reducing agent molecules can be controlled. Still, this method involves the esterification reaction reversible in an aqueous solution, resulting in a low rate of grafting; it has been gradually eliminated.

2、Functionalisation method after polymerization

This method is mainly to synthesize the main chain of the water-reducing agent, and then other methods will be introduced into the side chain for functionalization; this method is more difficult to operate, the molecular structure of the water-reducing agent is not flexible, and the monomer asks compatibility is not good so that the use of this method has been greatly restricted.

3, monomer direct copolymerization method

This method is the first preparation of active macromonomers, and then, in an aqueous solution will be small monomers and macromonomers in the initiator under the initiation of copolymerization. As the synthesis process of macromonomer is getting more and more mature and more and more kinds, this synthesis method has been the most commonly used method for the synthesis of poly(gazette acid) water-reducing agents at the present stage.

Advantages and disadvantages

In many concrete projects, naphthalene systems and other traditional high-efficiency concrete, due to the limitations of technical performance, more and more can not meet the needs of the project. In the domestic and foreign attention of a new generation of water reducing agent, polycarboxylic acid system high-performance water reducing agent, because the real based on the dispersion of cement action mechanism design effective molecular structure, with super-dispersive, can prevent the loss of concrete slump without causing obvious retardation, low dosage of play a high plasticising effect, good fluidity retention, cement to adapt to a wide range of molecular structure of the degree of freedom, synthesis technology, high-performance There is a lot of space, significant enhancement effect on concrete, can reduce the shrinkage of concrete, the content of harmful substances is very low and other technical performance characteristics, endowed with excellent construction and ease of concrete, good strength development, excellent durability, polycarboxylic acid high-performance water reducing agent has a good comprehensive technical performance advantages and environmental protection features, in line with the needs of modern concrete engineering. Therefore, polycarboxylic acid high-performance water reducing agent is gradually becoming the first choice of admixture for formulating high-performance concre

Supplier

Cabr-Concrete is a supplier under TRUNNANO of Concrete Admixture with over 12 years of experience in nano-building energy conservation and nanotechnology development. It accepts payment via Credit Card, T/T, West Union and Paypal. TRUNNANO will ship the goods to customers overseas through FedEx, DHL, by air, or by sea. If you are looking for Polycarboxylate Superplasticizer, please feel free to contact us and send an inquiry. (sales1@cabr-concrete.com)