Supercritical carbon dioxide waterless dyeing system and method

Abstract

The invention provides a supercritical carbon dioxide waterless dyeing system and method. The dyeing system is characterized by comprising at least one dyeing module and a public module. Each dyeing module comprises a dyeing unit and a filtering unit. Each dyeing unit comprises a dye kettle, a dyeing kettle, a circulating pump and a connecting pipeline, and each filtering unit comprises a cooler,a filter and a heat exchanger. The public module comprises a carbon dioxide storing and conveying unit, a refrigerating unit, a separating and recycling unit and a control unit. The public module is combined with the at least one dyeing module, wherein one dyeing module is connected with the public module through the corresponding connecting pipeline, and other dyeing modules are sequentially connected in parallel. The dyeing method sequentially comprises the following steps: deoiling; dyeing / oligomer removing; cooling, filtering, heating and flooding removing; and separating. Oligomers can beremoved in dyeing process, the yield of primary products can be increased, flooding can be reduced, and the washing fastness and the rubbing fastness of dyed finished products can meet national relevant standard requirements.

Description

technical field [0001] The invention belongs to the technical field of dyeing equipment and dyeing technology, in particular to a supercritical carbon dioxide anhydrous dyeing system and a dyeing method. Background technique [0002] In recent years, supercritical carbon dioxide anhydrous dyeing technology is gradually replacing traditional dyeing methods. This technology has the advantages of high efficiency, no pollution, and high dye utilization rate. It is the development direction of future dyeing technology. [0003] Chemical fibers inevitably produce oligomers during the production process, and the existence of oligomers has a great influence on the quality of supercritical carbon dioxide anhydrous dyeing. Polyester oligomers are mainly cyclic trimers of ethylene terephthalate, generally 1% to 3% of the fiber mass. [0004] Through the simulation experiment of the dissolution and dispersion of cyclic trimers in supercritical carbon dioxide fluid, the following conclu...

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Problems solved by technology

[0005] Traditional dyeing method: dyeing-separation, because oligomers cannot be removed, there is a problem of oligomer pollution, oligomers adhere to the inner wall of the equipment, causing friction damage to the dyed object; oligomers adhere to the surface of the dyed object, resulting in finished products The rate is low; the oligomers are attached to the yarn, resulting in wear and tear of the subsequent processing equipment and poor hand feel of the woven fabric. The uneven adhesion of the oligomers leads to uneven friction and color differences, and white spots and horizontal lines are prone to appear in the weaving fabric

[0006] Separation and recovery are carried out directly after dyeing in the traditional process. During the separation process, as the pressure decreases and the temperature decreases, the residual dye dissolved in the carbon dioxide fluid after dyeing balance will coagulate and adhere to the surface of the dyed object, causing stains and affecting the output. Yield; the existence of floating color causes the dyeing fastness to washing and rubbing fastness to only reach grade 3.5, which cannot reach the requirement of grade 4 of finished product fastness

[0007] There is no deoiling process before dyeing in the traditional process, the oil agent dissolved in carbon dioxide will affect the dyeing quality, especially the color difference of the outer layer of the cheese.

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