关键词: 聚羧酸减水剂, 芬顿试剂, 常温, 水泥净浆流动度

Abstract: With Isobutene polyoxyethylene ether (HPEG), acrylic acid (AA), methyl propene sulfonate (SMAS) as raw material, and initiated by Fenton reagent, polycarboxylate superplasticizers were prepared at room temperature. Relationship between different reaction condition and dispersion of polycarboxylic superplasticizer was discussed respectively. The copolymer was analyzed by Fourier transform infrared spectrometer(FTIR) and Gel permeation chromatography(GPC) .The optimal condition of synthesis is obtained as follows:H₂O₂/Fe²⁺as initiator was used in an amount of 2% of the total mass of the monomers and m(H₂O₂):m(FeSO₄)=1.2:1, the titration time of initiator was 3h, the polymerization temperature was 30℃, n(AA):n(HPEG)=4:1, the dosage of sulphonates was 1.6% of the total mass of the monomers, the chain transfer agent was thioglycolic acid and the dosage is 1.5% of the total mass of the monomers. The results showed that the initial fluidity of cement paste could exceed 290 mm and exceed 302mm after 1hours, when the dosage of polycarboxylate water reducer was 0.3% of cement mass, together with 0.29 of water cement ratio. This polycarboxylate superplastic synthesized at room temperature has high dispersity and dispersion retention, which provides a promising room temperature synthesis method.

Key words: polycarboxylate superplasticizers, Fenton reagent, room temperature, cement paste fluidity