Esterified macromonomers (P1) were obtained from methacrylic acid(MAA), maleic anhydride(MAn) and methoxy polyethylene glycol monomethyl ether (MPEG). A low sensitive polycarboxylate superplasticizer (P-DMG) was prepared by copolymerization of Esterified macromonomers (P1) with acrylic acid (AA), hydroxyethyl acrylate (HEA), acryloyloxyethyl trimethyl ammonium chloride (DAC) and 4-hydroxybutyl vinyl polyoxyethylene ether (VPEG). Compared with the conventional polycarboxylate superplasticizer, P-DMG can reduce the sensitivity to concrete dosage, water consumption, temperature and raw materials, and has good workability. It can be widely used in various concrete projects.

In this paper, the electropositive amide and phosphoric acid functional groups are introduced on the basis of the synthesis of common polycarboxylate superplasticizer, so as to reduce the sensitivity of the polycarboxylate superplasticizer to clay. In this paper, a small amount of 2-Capped1-Phoshate Easter containing olefin functional group was introduced into the polycarboxylate superplasticizer molecule by free radical reaction, which improved the negative electricity of the polycarboxylate superplasticizer and reduced sensitivity to clay. The performance test results show that the product can effectively reduce the sensitivity to clay during the process of mixing concrete with sandstone material with high mudstone content, and improve the fluidity of concrete and effectively reduce the viscosity of concrete.

A suspension stabilizer (P-XF) was prepared by copolymerization of acrylamide (AM), acrylic acid (AA), ammonium persulfate (APS), thioglycolic acid (TGA) and potassium hydrogen tartrate (KHT). The suspension stabilizer (P-XF), aluminum sulfate (Al2(SO4)3), p-toluenesulfonic acid (PTSA) and triethanolamine (TEA) were used to prepare a liquid accelerator (P-SN2). The test results show that compared with the liquid accelerator (P-SN1) without P-XF, P-SN2 not only can effectively shorten the setting time, but also has high stability, with a stable period of more than one year.