Synthesis of polycarboxylic acid superplasticizer


In situ polymerization grafting method: using polyether as the medium of unsaturated monomer polymerization, the main chain polymerization and the introduction of the side chain can be carried out at the same time, the process is simple, and the molecular weight of the synthesized water-reducing agent can be controlled to a certain extent, but the esterification reaction involved in this method is a reversible reaction, resulting in a low grafting rate in aqueous solution, which has been gradually eliminated. E14] Polymerization before functionalization method: This method mainly synthesizes the main chain of the water-reducing agent first and then introduces the side chain for functionalization by other methods. This method is challenging to operate, the molecular structure of water reducing agent needs to be more flexible, and the compatibility of the monomer could be better, which makes the use of this method relatively limited. Monomer direct copolymerization method: This method first prepares active monomer, then in an aqueous solution, small monomer and significant monomer copolymerization reaction under the initiation of the initiator. With the synthesis technology of macromonomers becoming increasingly mature, this synthesis method has been the most commonly used method for synthesizing polyphonic acid superplasticizers. At the same time, polycarboxylic acid superplasticizer also has some problems: 1. The slump retention is insufficient in high-temperature environments; 2. Strong temperature sensitivity, the construction of the same polycarboxylic acid superplasticizer in different seasons, the concrete slump is far different; 3. With few functional products, it is challenging to meet the requirements of ultra-high and ultra-long distance concrete pumping, negative temperature construction, ultra-early strength concrete preparation, and high concrete durability; 4. Increased viscosity in the practice of high blend material, the low water-binder ratio of concrete, substantial density is high, not conducive to construction; 5. Strong sensitivity to the mud content of sand and stone aggregate. [2] 6. It also has poor adaptability to machine-made sand, and sensitive mixing volume affects construction. If you are looking for high quality, high purity and cost-effective water reducer, or if you require the latest price of water reducer, please feel free to email contact mis-asia.


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