Effects of Process Conditions on Properties of Nanoscale Organic Pigment Encapsulated by Poly(styrene-maleic acid) Dispersion

Abstract

The effects of process conditions on properties of nanoscale organic pigment red 122 encapsulated by poly(styrene-maleic acid) dispersion were evaluated. The results revealed that sodium hydroxide provided the dispersion superior performance as compared with other additives, regardless of it being taken as dispersant or hydrolysis reagent. An optimal process was attained by using sodium hydroxide with a dosage of 0.6–0.68 times of molar amount of ‒COOH groups in poly(styrene-maleic acid) when the pigment/poly(styrene-maleic acid) was hydrolyzed at 45°C for 30 minutes.

Keywords:

• Encapsulated
• organic pigment red 122
• poly(styrene-maleic acid)
• stability

Acknowledgments

This work is supported by Zhejiang Province New Textile Research & Development Emphasised Laboratory, Zhejiang Textile & Garment Science & Technology Co., Ltd., Jiangnan University Fund (20600021050648). We also thank Jiangnan University for support in the course of our research.

Notes

^a Note: The weight ratio of dispersant to pigment is 0.4, the mixture was stirred at 10000 r/min for 30 minutes.

^b Note: M_NaOH = M_T/M_P = 0.64, M_T: molar amount of adding sodium hydroxide; M_P: the molar amount of –COOH in copolymer coated onto pigment surface; hydrolysis time 30 minutes; stirring rate 10000 r/min; temperature 45°C.

^a Note: The molar amount of hydrolysis reagent = 0.6 × Mp, Mp: the molar amount of –COOH in polycarboxylate coated onto pigment surface; hydrolysis temperature 45°C; hydrolysis time of 30 minutes; stirring rate: 10000 r/min.

^a Note: Hydrolysis temperature 45°C, hydrolysis time 30 minutes, stirring rate 10000r/min.

^b Note: M_NaOH = M_T/M_P, M_T: molar amount of adding sodium hydroxide, M_P: the molar amount of –COOH in copolymer coated onto pigment surface.