本实验以HPEG、甲基丙烯磺酸钠（APS）、丙烯酸（AA）为原料，过硫酸铵（SMAS）引发反应，探究最佳反应温度、反应时间、引发剂用量、原料物质摩尔比例。通过L9（34）正交实验，得出反应条件为80℃的反应温度、4小时的反应时间、引发剂用量为单体总量的3.0%、n（HPEG）：n（AA）：n（SMAS）=1:3.5:1.2时，效果最好。并得到最优投料方案：单体一次性混合投入，引发剂每隔一小时投入一次，五次投入完毕。利用傅里叶红外光谱仪（FR-IT）确定合成减水剂的官能团。并对合成的聚羧酸减水剂进行分散性能测试：掺量达到0.15%、水灰比为0.29，水泥净浆流动度为298mm，减水率为33%。

This experiment by HPEG as the monomer, methyl allyl sulfonate (APS), small acrylic acid (AA) as monomers, ammonium persulfate (SMAS) as initiator, explore the best reaction temperature, reaction time, dosage of initiator, raw material mole ratio. By L9 (34) orthogonal experiments, using the orthogonal principle to draw the best reaction conditions: reaction temperature is 80 ℃, reaction time is 5 hours, the dosage of initiator is 3.0% of the total monomer, n (HPEG) : n (SMAS) : n (AA) = 1:1. 2:3. 5. And get the optimal feeding scheme: the monomer is mixed in one time, the initiator is put into one hour every other hour, and it is finished five times. The functional group of the synthetic water reducing agent was determined by the infrared chromatograph (fr-it). The dispersion performance of the synthetic polycarboxylic acid reducer was tested: the content was 0.2% and the water cement ratio was 0.29, the cement slurry flow was 298mm, and the water reduction rate was 33%.