Preparation method of phosphorus-free environmentally-friendly chelating dispersing agent

Abstract

The invention discloses a preparation method of a phosphorus-free environmentally-friendly chelating dispersing agent, and the method comprises the following steps: A, placing deionized water as bottom water into a reaction kettle, adding sodium alginate, polyacrylamide, an initiator and a molecular weight regulator to the reaction kettle, introducing nitrogen, stirring, and dissolving; B, addinghydrolyzing polymaleic anhydride and a molecular weight regulator to the reaction kettle, and stirring; C, adding polyaspartic acid and a molecular weight regulator to the reaction kettle, and stirring; D, adding polyepoxysuccinic acid and a molecular weight regulator to the reaction kettle, and stirring; E, allowing a solution obtained in the step D to stand at 70 DEG C for 1.5-2 hours; and F, cooling a solution obtained in the step E to 25 DEGC, adding a sodium hydroxide solution dropwise to the reaction kettle to adjust the pH between 6.0 and 8.0, and filtering to obtain the chelating dispersant. The method has the advantages of being able to improve the environmental friendliness, and the chelating dispersing agent prepared by the method has good comprehensive performance.

Description

technical field [0001] The invention relates to a production process of textile printing and dyeing auxiliaries, in particular to a preparation method of a phosphorus-free environment-friendly chelating dispersant. Background technique [0002] Most textile dyeing and finishing processes are carried out in water, and Ca in water 2+ , Mg 2+ 、Cu 2+ , Fe 3+ , Mn 2+ , Zn 2+ Such metal ions are easy to form insoluble metal salts and deposit on fabrics and equipment, making textiles feel hard. More than 50% of the defects in dyeing and finishing processing are caused by poor water quality. In order to ensure the quality of dyeing and finishing fabrics, dyeing and finishing Chelating dispersants are required to be added in the pretreatment and dyeing process of the process. Chelating dispersants have the characteristics of chelating agent dispersants, which can not only chelate metal ions, but also disperse solid flocs or droplets into fine particles. The particles are stably...

AI Technical Summary

Problems solved by technology

[0002] Most textile dyeing and finishing processes are carried out in water, and Ca in water 2+ , Mg 2+ 、Cu 2+ , Fe 3+ , Mn 2+ , Zn 2+ Such metal ions are easy to form insoluble metal salts and deposit on fabrics and equipment, making textiles feel hard. More than 50% of the defects in dyeing and finishing processing are caused by poor water quality. In order to ensure the quality of dyeing and finishing fabrics, dyeing and finishing Chelating dispersants are required to be added in the pretreatment and dyeing process of the process. Chelating dispersants have the characteristics of chelating agent dispersants, which can not only chelate metal ions, but also disperse solid flocs or droplets into fine particles. The particles are stably suspended in the liquid. There are many types of chelating dispersants. The core of the preparation of chelating dispersants is the selection and proportioning of various compounds with complexing functions, the mixing sequence and mixing temperature with deionized water, etc. Conditions, but the finished products currently prepared generally cannot take into account both chelating dispersing performance and environmental protection. In order to pursue good chelating ability, many chelating dispersing agents contain organic phosphate, even if there is subsequent dyeing The entire wastewater treatment facility cannot eradicate phosphorus in wastewater, and the discharge of treated wastewater will still cause eutrophication of the water body, which runs counter to the current concept of green environmental protection