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Over the years, defoamers have developed continuously and gradually entered all walks of life. In industrial production involving stirring, defoamers are needed for eliminating and suppressing harmful bubbles. The generation of harmful bubbles will not only affect the quality and appearance of products, but also cause the unreasonable use of resources and increase the construction cycle. The harmful air bubbles produced during concrete mixing can cause material defects. The use of defoamer can optimize the structure of concrete holes, make the appearance of concrete without honeycomb surface, improve the mechanical properties of concrete materials and prolong the service life of concrete materials. This shows that the control and elimination of harmful foam has great technical and economic significance.
In the early 19th century, dispersive admixtures were used. However, in the 1960s, sulphonated melamine formaldehydes and analogous naphthalene derivatives were introduced. Nowadays, new admixtures based on polycarboxylate ethers are being developed. Polycarboxylate ethers possess structural characteristics that provide more fluid concrete, which is more resistant to segregation and exudation as compared to that prepared with the previously known superplasticizers. Polycarboxylate ethers have been commonly utilized to enhance the flow ability of cementitious materials. Moreover, polycarboxylate ether is one of the most effective types of plasticizers, water reducer, and disperser which promotes excellent flow ability, high strength, workability, and pump ability, and efficient dispersion for gypsum, cement, and ceramic materials.
The Triisopropanolamine,Diethanolisopropanolamine,Triethanolamine as cement grining aid could effective participate in hydration reaction with , C3A, C3S, C2S, and C4AF.