端羧基超支化聚酰胺阻垢剂的合成研究

Taking methyl acrylate (MA) and diethylenetriamine (DETA) as raw materials, and methanol as solvent, HBP-NH₂ with hyperbranched polyamide matrix is synthesized by self-polycondensation of ABx monomers. Carboxyl terminated hyperbranched polymers (HBP-COOH) with scale inhibition property is prepared through using sodium acrylate (SA) to modify HBP-NH₂. The effects of the time for monomers reaction, molar ratio between raw materials, time for polycondensation reaction, polycondensation temperature and dosage of SA on scale inhibition performance of HBP-COOH are investigated by using single factor analysis method. The best synthesis conditions are as follows: the time for monomers reaction is 4 h, n(MA): n(DETA)=1. 5: 1, the time for polycondensation reaction is 4 h, polycondensation reaction temperature is at 100℃ and n(SAA): n(-NH₂)=3. 5: 1. The scale inhibition performance of HBP-COOH is evaluated by static scale inhibition method. The experimental results show that HBP-COOH has excellent scale inhibition effect against CaSO₄, its scale inhibition rate against calcium sulfate can reach 96. 31% when the dosage of HBP-COOH is 8 mg•L^-1.