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针对造纸湿部系统常用助留剂阳离子聚丙烯酰胺(CPAM)在稀释过程中消耗清水量过大的问题,采用与上网浆浓度相当的阔叶木硫酸盐浆悬浮液取代清水对CPAM进行稀释,并利用旋转流变仪对所得到的CPAM-浆料体系的流变特性进行研究。结果表明,在中等转速下,所获得的CPAM-浆料混合体系的黏度随浆液浓度的增加而增加,并且出现剪切稀化现象,高转速下呈现牛顿流体的性质;温度对CPAM-浆料体系黏度的影响符合安德雷德黏度-温度曲线,随温度升高有降低趋势;稀释用浆浓度对CPAM的黏度影响较大,随浆浓的升高而升高,并且呈现假塑性流体的性质。
In view of the problem that CPAM, a commonly used retention aid for papermaking wet end system, consumes too much fresh water during dilution, CPAM is diluted with a hardwood kraft pulp suspension of net pulp concentration instead of water Rheological properties of the resulting CPAM-slurry system were investigated using a rotary rheometer. The results show that the viscosity of the obtained CPAM-syrup system increases with the increase of slurry concentration, and shear-thinning phenomenon appears at medium rotational speed and Newtonian fluid appears at high rotational speed. The effect of temperature on the mechanical properties of CPAM-syrup The influence of viscosity of the system accords with André’s viscosity-temperature curve, and decreases with the increase of temperature. The concentration of dilute pulp has a great influence on the viscosity of CPAM, increases with the increase of pulp concentration, and exhibits pseudoplastic fluid nature.