c the star shaped polycarboxylate superplasticizer solution with a mass concentration of 45 was finally obtained by mixing with 22 g of water the performance of polycarboxylate superplasticizer with a mass concentration of 45 prepared in example 9 was measured after storing 40 days at 7 u00b0 c firstly 12 g of trimethylol ethane was added to the reactor with a risen temperature to 75 u00b0 c and then 2 31 g of hydroquinone monomethyl ether 57 65 g of acrylic acid and 5 57 g of sulfamic acid were orderly added to the reactor with each interval of 8 minutes and constant stirring 17 41 g of cyclohexane was added when the temperature reached 95 u00b0 c after continual heating to 140 u00b0 c the esterification was carried out and during this process the produced water was separated by cyclohexane after reaction for 2 5 hours the water carrying agent was removed by vacuum pumping and the esterification product was obtained 0 13 g of esterification product and 100 85 g of water were added to the reactor with a risen temperature to 63 u00b0 c for stirring 12 minutes and then 100 g of methyl alkenyl polyethylene glycol molecular weight 2500 3 46 g of sodium allyl sulfonate 12 05 g of methacrylic acid and 38 1 g of sodium persulfate solution.