Preparation method for linear polycarboxylate type water reducing agent special for semi-hydrated gypsum
A technology of linear polycarboxylic acid and hemihydrate gypsum, which is applied in the field of building materials science, can solve the problems of inaccurate representation of molecular structure, poor adaptability, and large loss of fluidity of freshly mixed gypsum slurry over time, achieving excellent Water reduction and retarding effect, obvious dispersion effect and controllable setting time
Active Publication Date: 2014-03-26
CHINA UNIV OF MINING & TECH (BEIJING)
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The invention discloses a preparation method for a linear polycarboxylate type water reducing agent special for semi-hydrated gypsum. The preparation method comprises the following steps: a chain transfer agent is dissolved with water in a reactor at the temperature of 60-70 DEG C, the aqueous solution of X and the aqueous solution of an initiating agent are dropwise added into the reactor within 0.5-1 h, after the aqueous solution of the X and the aqueous solution of the initiating agent are dropwise added into the reactor completely, stirring is performed for reaction for 3-5 h, the temperature is dropped to be lower than 40 DEG C, and an alkaline solution is used for neutralization until the pH value ranges from 6 to 8, so that light yellow or sandy beige liquid namely the linear polycarboxylate type water reducing agent special for semi-hydrated gypsum is obtained, wherein the X comprises a monomer A, and can further comprise one or more of a monomer B, monomer C and a monomer D. The preparation method for the linear polycarboxylate type water reducing agent is simple in process and short in synthesis cycle, the water reducing agent is good in repeated stability, low in cost, non-toxic and pollution-free, does not contain formaldehyde, and is suitable for popularization and application, and the prepared water reducing agent product special for the semi-hydrated gypsum is high in water-reducing rate and excellent in stability, adaptability and delayed coagulation effect.
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