Preparation of pre-dispersed C.I. Pigment Orange 34 with core-shell structure

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Abstract In the coloring process of traditional organic pigment masterbatch, the filter dispersion value of the masterbatch is relatively large, pigment dispersion needs to be improved, and the preparation process is complicated. Using 3,3'-dichlorobenzidine(DCB) and p-tolylpyrazolone as raw materials, a diazotization coupling reaction was carried out to obtain a mixture of C.I. Pigment Orange 34 (PO34) and water. 110-Type polyethylene wax (PE) was added under heating condition in order to combine the PO34 with the melted PE outer layer to yield the desired pre-dispersed PO34 (PPO34) with uniform morphology and good dispersibility. By changing mass ratio of PE and PO34, particle size of PE, heating time and heating temperature, stirring rate and other experimental conditions, the effects on the performance of the pigments were studied. The better condition obtained by comparing the morphology and coloring data is as follow: particle size of polyethylene wax 41—60 mesh, mass ratio of PE and PO34 1∶1, heating time 20 min, heating at 90 ℃, mechanical stirring rate 200 r·min^-1. The pre-dispersed PO34 prepared under this condition has obvious core-shell structure and uniform particle size. Compared with original PO34, PPO34 exhibited better hydrophobic properties and lower water content, which resulted to a short filtration time. The preparation of PPO34 is more environmentally friendly and efficient, which avoid of the dust pollution from the traditional hard filtration cake pulverized process. Compared with the masterbatch addition process, PPO34 exhibited better dispersion performance. Under the premise of maintaining the pigment properties similar to the original pigment in shade, brightness, saturation, and color, the color strength of the pigment is enhanced, and the various properties of the pigment are also improved.

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	ZHANG Tianyong
	WANG Yutong
	LIU Wanxing
	LI Bin
	JIANG Shuang
	LYU Dongjun

Keywords： C.I. pigment orange 34 polyethylene wax pre-dispersion nuclear-shell structure pigment modification

Received 2022-01-06;

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ZHANG Tianyong, WANG Yutong, LIU Wanxing, LI Bin, JIANG Shuang, LYU Dongjun.Preparation of pre-dispersed C.I. Pigment Orange 34 with core-shell structure[J] Chemcial Industry and Engineering, 2024,V41(1): 12-20

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