聚羧酸盐和聚萘磺酸盐分散剂在高浓度水悬浮剂中的应用

doi:10.7503/cjcu20160848

摘要/Abstract

摘要：

研究了聚羧酸盐分散剂(SD-819)和聚萘磺酸盐分散剂(SD-661)在水溶液中的表面性能; 同时考察了分散剂添加量对500 g/L扑草净水悬浮剂(SC)中的吸附、 Zeta电势和流变性能等的影响. 结果表明, 与分散剂SD-661相比, 分散剂SD-819水溶液中的表面张力(γ_cmc)小, 临界胶束浓度(cmc)和胶束生成自由能(ΔG_mic)低, 吸附量大, 制备出的扑草净SC黏度低, 流动性好, 触变性优良. 结果表明, 聚羧酸盐分散剂更适用于高浓度扑草净SC的制备.

关键词: 分散剂, 水悬浮剂, 表面性能, 流变性能, 聚羧酸盐, 聚萘磺酸盐, 扑草净

Abstract:

We studied the surface properties of polycarboxylate dispersant(SD-819) and polynaphthalene sulfonate dispersant(SD-661) in aqueous solution. We also investigated the effects of the addition of dispersant on the adsorption, zeta potential, and rheological properties of the 500 g/L suspension concentrate(SC) of prometryn. The results show that dispersant SD-819 have smaller surface tension(γ_cmc), lower critical micelle concentration(cmc), micelle formation free energy(ΔG_mic) and bigger adsorption quantity in aqueous solution compared with the dispersing agent SD-661. Besides, prometryn SC prepared by SD-819 have low viscosity, good fluidity and excellent thixotropic. In conclusion, comparing two dispersants indicated that polycarboxylate dispersant is more suitable for the preparation of prometryn SC.

Key words: Dispersant, Suspension concentrate, Surface property, Rheological property, Polycarboxylate, Naphthalenesulfonate, Prometryn

中图分类号:

O632
O648

TrendMD:

郭振豪, 桂奇峰, 张博, 任帅臻, 张树鹏, 李新忠, 任天瑞. 聚羧酸盐和聚萘磺酸盐分散剂在高浓度水悬浮剂中的应用. 高等学校化学学报, 2017, 38(7): 1278.

GUO Zhenhao, GUI Qifeng, ZHANG Bo, REN Shuaizhen, ZHANG Shupeng, LI Xinzhong, REN Tianrui. Application of Polycarboxylate and Naphthalenesulfonate Dispersants in High Concentration Suspension Concentrate^†. Chem. J. Chinese Universities, 2017, 38(7): 1278.

图/表 10

Fig.1 Surface tension γ plotted as a function of concentration of SD-819(a) and SD-661(b)

Table 1 Surfactant properties in aqueous solution at 25 ℃

Dispersant	γ_cmc/(mN·m^-1)	cmc/(mol·L^-1)	Γ_max/(g·cm^-2)	A_cmc/nm²	ΔG_mic/(kJ·mol^-1)	ΔG_ads/(kJ·mol^-1)
SD-819	42.1	4.02×10^-4	5.91	0.281	-19.38	-24.47
SD-661	58.5	1.69×10^-3	1.85	0.896	-15.83	-22.42

Fig.2 Zeta potential(A) and average particle size(B) of suspension concentrate of prometryn with different amounts of SD-819(a) and SD-661(b) at 25 ℃

Fig.3 Adsorption isotherms of dispersants onto prometryn particle at 298 K(a), 313 K(b) and 328 K(c) with SD-819(A) and SD-661(B)

Table 2 Langmuir and Freundlich adsorption isotherm for dispersants onto prometryn at different temperatures

Dispersant	Temperature/K	Langmuir equation			Freundlich equation
Dispersant	Temperature/K	Г/(mg·g)	10^-2 b/(L·mg^-1)	R²	f	n	R²
SD-819	298.15	6.23	1.46	0.971	1.23	4.56	0.867
	313.15	6.04	1.05	0.953	1.15	4.09	0.823
	328.15	5.82	0.89	0.965	1.03	3.83	0.765
SD-661	298.15	4.70	4.99	0.974	2.39	10.81	0.882
	313.15	4.50	3.22	0.995	1.89	8.34	0.796
	328.15	4.21	2.98	0.979	1.38	6.29	0.823

Fig.4 Effect of SD-819(a) and SD-661(b) with different dosages on apparent viscosities at 25 ℃

Fig.5 Effect of the amount of dispersant added on rheological properties of prometryn SC at 25 ℃ with SD-819(A) and SD-661(B)

Fig.6 Three interval thixotropy curves of prometryn SC with SD-819(A) and SD-661(B)

Table 3 Rheological data of three interval thixotropy test

Sample(mass fraction)	Structure recovery ratio(%)
Sample(mass fraction)	5 s	10 s	15 s
SD-819(2%)	78.26	82.92	87.57
SD-819(4%)	103.60	109.90	113.50
SD-819(6%)	104.90	115.40	117.90
SD-661(2%)	58.38	64.32	67.15
SD-661(4%)	72.38	77.21	82.04
SD-661(6%)	107.50	109.10	113.70

Scheme 1 Illusturation of effect of different dispersant on dispersion ability of particles

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