Supercritical carbon dioxide dyeing method

Abstract

The invention provides a supercritical carbon dioxide dyeing method, which includes the following steps: 1) winding a fabric on a distributing rack and hung in a high-pressure dyeing kettle, unscrewing a kettle cover to feed in a certain amount of filter cakes and screwing the kettle cover; 2) adjusting the temperature and pressure on the control panel to object values, opening a condensing device to start a carbon dioxide steel cylinder to feed gas into a system, pressurizing the system by starting a plunger pump after the steel cylinder pressure and the system pressure are balanced, and starting a circulating pump to enable the fluid in the system to be circulating; 3) timing the dyeing after the pressure and temperature reach the preset values; 4) opening a reducing valve to release pressure after the dyeing set time is balanced under the temperature and pressure, enabling the carbon dioxide to be recovered into the steel cylinder through a separating kettle, and discharging the remaining carbon dioxide after the pressure in the steel cylinder and the system is balanced; and 5) opening the dyeing kettle after the system is cooled to the room temperature, so as to take out the dyed fabric. The dyeing process is environment-friendly, energy-saving, water-saving, economical and efficient.

Description

Technical field [0001] The invention relates to a dyeing method, in particular to a supercritical carbon dioxide dyeing method. Background technique [0002] Traditional dyeing and finishing is the industry that consumes the most water in the textile industry. The dyeing medium needs a lot of water, and it also needs clean water washing after dyeing. Traditional dyeing methods use a wide variety of chemicals, especially when dyeing with disperse dyes, vat dyes or insoluble azo dyes, because disperse dyes are insoluble in water, a large amount of diffusing agents, surfactants, etc. must be added during the dyeing process In order to obtain a satisfactory dyeing effect. In view of the above reasons, the sewage discharged after dyeing contains a large amount of unfixed dyes and auxiliaries. These auxiliaries and unfixed dyes remain in the dyeing liquor and cause pollution. In addition, printing and dyeing wastewater has the characteristics of high organic pollutant content, deep ...

AI Technical Summary

Problems solved by technology

In view of the above reasons, the sewage discharged after dyeing contains a large amount of unfixed dyes and auxiliaries, and these auxiliaries and unfixed dyes remain in the dyeing liquor to cause pollution

Moreover, printing and dyeing wastewater has the characteristics of high content of organic pollutants, deep color, high alkalinity, and large changes in water quality. It is a difficult-to-treat industrial wastewater.