1. Overview
Among many substances, CO2 is a non-polar molecule, which is suitable for dyeing hydrophobic synthetic fibers. Polyester is an important synthetic fiber, which has the characteristics of strong hydrophobicity, few dyeing groups, poor moisture absorption and small expansion in water. Only dyes with small molecular weight are easy to dye, difficult to dye with hydrophilic dyes, and difficult to dye deeply to achieve firm color and luster, supercritical CO2 dyeing can make the dye better penetrate into the fiber polyester, aggravate the swelling of polyester, promote the diffusion and transfer of dye molecules, and accelerate the combination of dye molecules and polyester. Supercritical dyeing technology has good dyeing effect on synthetic fibers, and supercritical dyeing of polar natural fibers is still in the stage of exploration and research in China, and some progress has been made in the study of natural fiber dyeing with supercritical dyeing equipment.
Considering the environment and the above technical factors, supercritical CO2 has become the best choice for the textile industry. The low viscosity and high solubility of supercritical fluid make it have high application value, and can enter very small holes well without the need for convection between holes.
Main technical parameters of 2.
1. Dyeing kettle: volume 1L ~ 24L, maximum design pressure 40MPa, maximum design temperature 350 ℃
2. Dye kettle: volume 1L ~ 24L, maximum design pressure 40MPa, maximum design temperature 350 ℃
3. Separation kettle: volume 1L ~ 10L, maximum design pressure 20MPa, maximum design temperature 85 ℃
4. Power supply voltage: 380V three-phase four-wire system
5. The maximum power of the whole machine: 1L, 2L 10kw; 3-5L 12-15kw