Soochow University

Nantong Textile and Silk Industrial Technology Research Institute

Siyang Zhonglian Textile Technology Co., Ltd.

Jiangsu Danmao Textile Co., Ltd.

Shandong Gaomian Group Co., Ltd.

Jiajie Long

Feng Chen

Xiaochen Wei

Hongmei Xu

Jianzhong Guo

Chuanglong Cui

Chong Cai

Dao Xu

Aidong Wang

Ming Shen

Xiaoping Bi

Chao Gao

Kai Yan

Jinlin Yu

Wei Gao

The invention discloses a waterless fiber dyeing method using supercritical carbon dioxide fluid as a medium. Dry fibers are tightly loaded layer by layer in a porous yarn cage. After dyeing, the fibers are cleaned to remove unfixed dyes by an online way, thereby obtaining waterless dyed dry fiber products with good quality. With the supercritical carbon dioxide dyed by a dye, the invention can not only solve the problems of high energy consumption, high discharge, high pollution in the traditional dyeing process, but also obtain better dyeing effect. The invention has a simple process and convenient operation, which can effectively realize dry dyeing processing. The reaction is mild, avoiding the use of a large amount of water, heat and additives in high concentration, which has the features of being high efficiency and environmentally friendly.

Fiber dyeing method using supercritical carbon dioxide fluid as medium

The present invention relates to a waterless fiber dyeing method using a mixed fluid medium, in which supercritical carbon dioxide fluid medium is mixed with steam to form a mixed fluid medium, so that the waterless fiber dyeing effect to natural fibers is improved. The method of the invention can effectively modify the hydrophobic supercritical carbon dioxide fluid medium and improve the polarity thereof, thereby increasing the solubility of polar dye under the dyeing condition and simultaneously expanding the fiber. Thus, the present invention significantly improves the dyeability and dyeing behavior of the hydrophilic fibers in supercritical carbon dioxide fluids. The invention has the advantages of simple process, convenient operation and low energy consumption, and avoids consuming a large amount of water resources and discharging pollutants in the traditional process, and has the characteristics of environmentally friendly and high efficiency.

Fiber dyeing method using mixed fluid medium

The invention discloses a special-purpose reactive disperse dye for waterless dyeing of natural fibers in supercritical COfluid and an intermediate thereof. The reactive disperse dye has a longer alkane-chain bridging group between a chromophoric parent structure and an active group of the dye, which effectively promotes the donating-withdrawing effect on the electron cloud in the conjugated system, enhances the hyperchromic effect, effectively reduce the influence of the active group itself and its reaction on the dye coloring system, improves the color and stability against acid and alkali of the dye, and facilitate the improvement of the compatibility of the dye with supercritical fluid and the dyeing performance for natural fibers as well. The invention also discloses an intermediate of the reactive disperse dye, and a method for preparing the reactive disperse dye.

AZO dye for waterless dyeing of natural fibers in supercritical COfluid, and preparation method thereof

The invention discloses a waterless fiber dyeing machine suitable for mixed fluid medium, including a dyeing tank, a carbon dioxide pressurizing system and a polar medium pressurizing system, a fiber loading system, a circulating dyeing system, a carbon dioxide recycling system, a polar medium separating and recycling system and an automatic unloading system. Since there are pressurizing systems and separating and recycling systems for carbon dioxide medium and polar medium, dyeing with the mixed fluid medium is realized in the waterless dyeing tank and the circulating dyeing system thereof; the hydrophobic carbon dioxide fluid medium is effectively modified, so that the dyeing performance and effect of the dye molecules on the hydrophilic natural fiber are improved. The fiber loading system and the unloading system can significantly improve the fiber loading efficiency, the discharging efficiency of the products.

Waterless dyeing machine suitable for mixed fluid medium

The invention relates to a separation, recycling and self-cleaning system of a supercritical fluid dyeing machine. The system includes a supercritical fluid medium reservoir, one or more parallel dyeing units, a high-pressure pump, a primary separator, a secondary separator and a membrane separator sequentially connected. A dyeing medium and residual dye in dyeing units can be efficiently separated and recycled simultaneously, and when the separation and recycling is finished, each dyeing unit can be directly opened so that the dyeing units and products can be cleaned after dyeing, thereby improving the production and processing efficiency of supercritical fluid waterless dyeing and achieving simple operations, complete separation, stability and reliability and a blowback self-cleaning. The invention has a broad application prospect and practical significance in fundamentally addressing generation and emission of pollutants in the textile printing and dyeing industry and realizing energy conservation, consumption reduction, emission reduction and clean production.

Separation, recycling and self-cleaning system of supercritical fluid dyeing machine

The invention discloses a mobile dyeing cup for supercritical fluid waterless dyeing and finishing. The dyeing cup achieves separate or simultaneous filling of the medium into multiple dyeing units, and simultaneous heating of the dyeing units for proofing processing. A medium outlet is provided at the lowest position of the bottom of the cup, and the inner surface of the dyeing cup is coated with polytetrafluoroethylene, to effectively reduce residual dye chemicals in the cup and improve the cleaning efficiency. The perforated baffle at the bottom of the cup effectively prevents a textile product from blocking the medium outlet during medium filling and outputting, so that the processing medium and residual dye chemicals can be smoothly discharged. Accordingly, defects of an existing fixed proofing device such as low utilization efficiency, complex cleaning and incapability of meeting the proofing requirements of commercial production are overcome.

Mobile dyeing cup for supercritical fluid dyeing and finishing

The invention relates to a multi-pipe quantitative medium filling system of a supercritical fluid waterless dyeing machine. The system comprises a supercritical fluid medium reservoir, a stop valve, and a medium filter sequentially connected by a high-pressure main pipe, and at least two filling branches independent of each other and connected to the medium filter. Each filling branch includes a booster pump, a supercritical fluid high-pressure mass flowmeter, a ball valve, and a dyeing unit sequentially connected along a medium forward direction by a high-pressure branch pipe. By using a mass-measurement filling system having multiple branches independent of each other, the invention can effectively realize simultaneous and accurate quantitative medium filling for separate dyeing units and differentiated filling for dyeing units with different medium masses, thus overcoming disadvantages such as unreliability, inaccuracy and low use efficiency of a conventional method, and also making a dyeing operation simple and scientifically feasible.

Multi-pipe quantitative medium filling system of supercritical fluid dyeing machine

The invention discloses a proofing dyeing cup for supercritical fluid waterless dyeing and finishing, which achieves separate or simultaneous filling of the medium into multiple dyeing units, and simultaneous heating of the dyeing units for proofing processing. Efficiency of proofing processing such as high-pressure supercritical fluid waterless dyeing and thus the utilization rate of the medium boosting and filling system and separation and recycling system are significantly improved, so that the proofing requirements of commercial production of textile waterless dyeing and finishing are met. Furthermore, dye chemicals at the bottom of the cup can be stirred to facilitate dissolution, and the dye chemicals at the bottom of the cup can be swept and cleaned. Thus, defects of an existing fixed supercritical fluid dyeing proofing device or an equipment system thereof, such as low utilization efficiency, complex cleaning and incapability of meeting the proofing requirements of commercial production, are overcome.

Proofing dyeing cup for supercritical fluid dyeing and finishing

The invention provides a method for measuring the diffusion performance of an acid dye in a color paste, comprising preparing a primary paste and placing the primary paste into a transparent cylindrical container; adding a dye to the primary paste formulate a color paste, and flatly and uniformly paving a layer of the color paste on an upper surface of the primary paste; performing constant-temperature treatment at 60-95&#xb0; C. on the cylindrical container, so that the dye in the color paste on the top of the blank primary paste in the cylindrical container diffuses downwards to the bottom of the cylinder; and sampling the primary paste from a sampling hole, and diluting the sampled primary paste with deionized water. The method of the invention has simple operation steps, reliable and safe experiments, highly stable test data and good reproducibility of results, and high temperature and high pressure are not required herein.

Method for measuring diffusion performance of acid dye in color paste

A solvent medium for diazotization reaction includes a mixed solution of polyethylene glycol and water. The molecular weight of polyethylene glycol is 200-600, and the volume ratio of polyethylene glycol and water is 1:0.4-1.5. The mixed solution also includes hydrochloric acid or sulfuric acid, and the concentration of Hin the mixed solution is 0.32-1.72 mol L.

Solvent medium for diazotization reaction

A device for color-fixing processing on textiles includes a supercritical carbon dioxide fluid unit, a fixing liquid storage tank () and a fixing reactor (). The fixing liquid storage tank () is below the fixing reactor () and sealed connected by a connecting device (). The fixing liquid storage tank () has a cylindrical cavity in which a fluid distributor () is mounted. The fluid distributor () is composed of several interconnected pipes which bend down with the nozzles downward, and one of the pipes is used as circulated fluid inlet () connected with the supercritical carbon dioxide fluid unit, and the rest of the pipes are used as circulated fluid outlets.

Method for colour-fixing processing of textile and device therefor

A method for photocatalytic white discharge printing for achieving patterns on textiles includes closely integrating substrates with patterned printing plates or fixing patterned printing plates on one or both sides of a substrate, placing them in a reactor equipped with a light source and containing the photocatalytic white discharging formulation. The method has the characteristics of a simple process, short processing, easy controlling and wide adaptability. The process eliminates the need for printing plates and expensive printing apparatus used in complicated conventional printing methods. Additionally, the photocatalytic solution can be reused which avoids generous application of chemical agents and waste discharges that are present in conventional printing methods. The method is beneficial for cutting costs, saving energy, reducing emissions and has cleaner production.

Method of photocatalytic white discharge printing for achieving patterns on textiles

A photocatalytic method of colored discharge printing for producing colorized patterns on textiles includes over dyeing textiles with illuminant dyes and ground shade dyes respectively, manufacturing patterned printing plates with hollow-out decorative patterns, applying a photocatalyst on the over-dyed textiles through the hollow-outs, using a photocatalytic method of colored discharge printing to produce localized discoloration of the ground shade while leaving the illuminant dyes on the textile which produces an effect of colorized patterns on the textiles. The method has the characteristics of being a simple process with a simple apparatus and has short processing, easy control and wide adaptability. The method eliminates the needs for printing pastes and expensive printing apparatus used in the complicated process in a conventional printing method.

Photocatalytic method of discharge printing for producing colorful patterns on previously dyed textiles

A phase-transfer catalytic color fixation processing method for textile includes the following steps: (1) dry-dyeing a textile with disperse reactive dyes in supercritical carbon dioxide fluid under waterless condition; (2) putting the textile in a phase-transfer catalytic fixation device, taking phase-transfer catalyst as the carrier of circulated supercritical carbon dioxide fluid, transporting the ionized fixing catalytic alkaline substance from aqueous phase to hydrophobic supercritical carbon dioxide fluid phase, getting full contact with functional groups on fibers, resulting in the fixing catalytic reaction with disperse reactive dyes.

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Suzhou, China

Jiajie Long