GH-9 Retarder for Oil Well Cementing

GH-9 contains dicarboxylic acid and sulfonate functional groups, which react with tricalcium aluminate (C₃A) and tricalcium silicate (C₃S). Through adsorption, chelation, dispersion and wetting actions, it disperses cement particles via a diffused double electric layer during the early hydration stage, forming a solvation film with calcium ions on the particle surface. GH-9 preferentially adsorbs on C₃A to strongly retard hydration, while showing weaker adsorption on C₃S, thus ensuring the later strength development of the cement stone.