writer：Miao Wang, Yijun Yao, Hailiang Wu
keywords：增稠剂，低碳
source：期刊
Issue time：2024年
Polyacrylic acid (PAA) thickener was synthesized by inverse emulsion polymerization using acrylic acid and ammonia as aqueous monomers, potassium persulfate?sodium pyrosulfite as redox system, 5# white oil as continuous phase, N, N ′ -Methylene bisacrylamide (MBA) as crosslinking agent. The Fourier transform infrared spectroscopy provided evidence for the synthesis of PAA. The scanning electron microscopy and transmission electron microscopy results indicated that the thickener has a spherical morphology and a nitrogen content of
11.22 %. To further improve the electrolyte resistance of the thickener, hydrophobic modified monomers were introduced into the polyacrylic acid molecular chain to construct a hydrophobic cross-linked network structure. The results showed that the viscosity and electrolyte resistance of the thickener were significantly improved. The modified thickener (PAA-SMA/LMA) was prepared by composite modification of octadecyl methacrylate and
lauryl methacrylate, with a viscosity of 16,200 mPa?s (mass fraction of 2 wt%). The viscosity retention rates in the tap water and electrolyte solution were 88.69 % and 46.42 %, respectively. The dynamic light scattering and rheological results indicated that the particle size of the PAA-SMA/LMA was concentrated at 2.709  μ m, and belonged to a pseudo-plastic fluid with good thixotropy. The PAA-SMA/LMA served as a carrier for dye transfer to nylon/wool carpets, meeting the requirements of ink-jet printing. The present study introduces a new approach to enhance the viscosity, rheological properties, and electrolyte resistance of thickeners. Furthermore, it provides a theoretical basis for the advancement of synthetic thickeners utilized in ink-jet printing processes.