Supercritical carbon dioxide dyeing system and process

Abstract

The invention provides a supercritical carbon dioxide dyeing system. The supercritical carbon dioxide dyeing system comprises a dyestuff mechanism, wherein the dyestuff mechanism comprises an extracting device and a dyeing device; the extracting device comprises a plant dyestuff extracting kettle; the dyeing device comprises a natural plant dyestuff kettle and a dyeing kettle; the plant dyestuff extracting kettle and the natural plant dyestuff kettle are connected in parallel in the carbon dioxide dyeing system; and after the plant dyestuff extracting kettle is in parallel connection with the natural plant dyestuff kettle, a discharging end passes through a feeding end of the dyeing kettle. The invention further provides a supercritical carbon dioxide dyeing process which comprises a cleaning process. According to the supercritical carbon dioxide dyeing system and method, equipment of the system and the process are optimally combined; the production efficiency of the supercritical carbon dioxide dyeing technology is greatly improved, meanwhile, automated extracting mode is realized, the work intensity is relieved, and safety accidents are avoided.

Description

technical field [0001] The invention relates to the field of dyeing, in particular to a supercritical carbon dioxide dyeing system and a dyeing process. Background technique [0002] At a certain temperature and pressure, carbon dioxide can be in a supercritical state, that is, when carbon dioxide exceeds the critical temperature and critical pressure, it has the intermediate properties of gas and liquid. The viscosity of supercritical fluid is similar to that of gas, the diffusion coefficient is between gas and liquid, and the penetration force is very large. Because it can obtain the same density as liquid, the dissolving power is also large, and it dissolves substances quickly. CO 2 Due to its non-toxicity, non-explosiveness, high safety, low cost, and easy availability, supercritical carbon dioxide is widely used in the extraction process. The dye industry uses the strong dissolving power of supercritical CO2 to dissolve the dye, and utilizes the high diffusivity of su...

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Problems solved by technology

[0004] The above patents are to improve the uniformity and dyeing rate of supercritical carbon dioxide dyeing technology through the improvement of the dyeing kettle and the adjustment of the process. In the prior art, when supercritical carbon dioxide dyes fibers or cloths, it is generally purchased Chemical dyes are directly dissolved in supercritical carbon dioxide, and then dyed. The non-environmental protection of the dyes will stimulate the human body and pollute the environment.

[0005] Furthermore, some technologies are to dissolve a single natural vegetable dye in supercritical carbon dioxide for dyeing, but this dyeing method still cannot meet the requirements of customer groups for environmentally friendly clothes

[0006] In some existing technologies, the plants with natural dyes are first extracted to extract the dyes, and then the extracted natural plant dyes are dyed with supercritical carbon dioxide technology to dye the fabrics to be dyed, which still cannot meet people's diversified needs for colors

[0007] In addition, the extraction and dyeing of natural dyes cannot be carried out simultaneously in the process of the prior art, and the processing time is long, resulting in low overall efficiency. At the same time, supercritical CO 2 Release directly after use, which wastes resources, increases production costs, and reduces the benefits of enterprises

[0008] At the same time, most plant dye extraction kettles require high-pressure and high-temperature process operations, so the design of the upper cover of the plant dye extraction kettle is relatively heavy and cumbersome, which has extremely high operating requirements for the operator, and it is very easy to cause high-temperature burns and other safety hazards. ACCIDENT

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