230 results about "Disperse dye" patented technology

The invention provides high-grinding-efficiency color paste, a preparation method thereof and dispersed ink, and belongs to the technical field of dispersed ink, and the high-grinding-efficiency color paste comprises the following components in percentage by weight: 15%-30% of disperse dye toner, 15%-25% of a dispersing agent, 5%-15% of resin ammonium salt, 10%-20% of a dissolution promoting mixture, 0.5%-2% of a wetting agent and the balance of water; the dispersing agent comprises a hyperbranched polymer and a sodium naphthalene sulfonate improved polymer; the hyperbranched polymer takes a benzene ring as a center, hydrophobic groups and hydrophilic groups on a branched chain are randomly distributed, the hydrophilic groups of the branched chain comprise carboxylate and sulfonate, and the hydrophobic groups of the branched chain comprise alkane, ester and aryl. According to the invention, the hyperbranched polymer and the sodium naphthalene sulfonate improved polymer are mixed with the dispersing agent, so that the problem of abrupt change of ink viscosity can be avoided when the content of ink toner is relatively high, thereby obtaining the color paste with strong dispersion and high stability, and further obtaining the dispersed ink with good stability.

The invention belongs to the technical field of textile materials, and relates to an environment-adaptive multi-spectrum camouflage cloak and a preparation method thereof. Comprising a cloak body, the cloak body is made of composite fabric, the composite fabric sequentially comprises a wear-resistant layer, a waterproof layer and a close-fitting layer from outside to inside, and the surface of the wear-resistant layer is sequentially coated with a thermochromic dye layer, a far infrared plating layer and a visible light hiding layer from bottom to top; the thermochromic dye layer is formed by compounding disperse dye and bistable thermochromic microcapsules, and the visible light stealth layer is prepared from photonic crystal gel; and the far infrared plating layer is prepared from an indium tin oxide film. The desert camouflage is switched below 5 DEG C, the woodland camouflage is switched above 60 DEG C, and different regional environments are matched; according to efficient multi-spectrum camouflage, the color difference between the visible light band and the background is smaller than or equal to 1.95, three emissivity levels are formed in the infrared band, and the thermal imaging detection probability is reduced.

The invention provides a dyeable high-temperature-resistant modified meta-position aramid fiber and a preparation method thereof. The modified meta-aramid fiber is mainly prepared from a spinning solution prepared from m-phenylenediamine, methyl 3, 5-diaminobenzoate, 3, 3 '-diaminodiphenyl sulfone and an isophthaloyl dichloride copolymer through dry spinning, and the dye uptake of a disperse dye is not lower than 85%; the thermal decomposition temperature is not less than 400 DEG C. The preparation method comprises the following steps. S1, fully continuous polymerization; s2, continuously neutralizing and conveying; s3, direct spinning; and S4, fiber forming and post-treatment. The method has the advantages that (1) the quality difference between batches in the traditional intermittent method is eliminated, and the uniformity and stability of the product performance are realized; and the preparation process is compact, the production efficiency is high and the energy consumption is low. And (2) the dyeing performance of the prepared fiber is obviously improved, the inherent high-temperature-resistant characteristic of the aramid fiber is maintained, and the mechanical property is excellent. And (3) the application range of the meta-position aramid fiber is expanded.

The invention relates to the technical field of spectral analysis, in particular to a disperse dye component spectral analysis and identification system based on trace detection, which comprises a wave band interception module, a perturbation extraction module, a spectrum curve identification turning point recording fluctuation direction and a continuous extraction main peak core area expansion two-side generation analysis area, a phase shifting module is used for analyzing a curve fragment lifting relation and a turning sequence to generate a trajectory diagram; and a dye locking module is used for extracting a dye component with the highest matching degree by matching trajectory features to generate a candidate set. According to the method, a core peak area is locked through the fluctuation direction and continuity of a curve turning point, secondary wave crests are discriminated through an adjacent slowly-changing section, a disturbance sequence is formed by combining a mass center offset ratio and curvature connection, a curve fragment lifting relation and a turning sequence are analyzed to generate track mapping, and dye components are screened through track arrangement and offset symmetric matching. And the frequency distribution interval continuity and peak value overlapping verification ensure reliable identification.

The application discloses a low-temperature one-bath dyeing process for polyester-cotton blended fabric, which comprises the following steps: soaking the polyester-cotton blended fabric in an aqueous solution of alkaline ionic liquid for pretreatment to obtain a pretreated fabric with liquid; then mixing the pretreated fabric with liquid with reactive dyes and disperse dyes, and then performing supercritical CO2 fluid dyeing to obtain dyed fabric; the alkaline ionic liquid contains hydrophobic alkyl groups and has alkalinity; during the pretreatment, the alkaline anions form a hydrogen bond network with the hydroxyl groups of cellulose, thereby destroying the crystalline region of cellulose and increasing the dyeing rate; during the dyeing, the alkaline ionic liquid is distributed on the interface between water and CO2 fluid as a surfactant to form an inverse emulsion, thereby providing a microenvironment for the dyeing of cotton fibers by the reactive dyes; in addition, the alkaline anions of the alkaline ionic liquid can exchange with CO2 to generate carbonates, so that the polarity of the microenvironment is enhanced to be alkaline, and the reactivity of the reactive dyes and cotton fibers is improved, thereby improving the dyeing rate.

The present application relates to a kind of acrylic fabric dyeing and finishing process, including low temperature adding disperse dye, and glacial acetic acid is used to dye fabric, when the dosage of disperse dye exceeds 2.0%, it needs to be reduced twice cleaning, when the dosage of dye is 0.5%~2.0%, it needs to be reduced once cleaning, remove surface attached disperse dye;When the dosage of dye is 0.5% or less, it does not need to be reduced cleaning, after completing reduction cleaning, adding organic acid to fabric for acid neutralization treatment, dehydration after tank, opening, setting.The present application can realize energy saving and time saving in dyeing process, improve the turnover rate of dyeing vat, can satisfy full color system dyeing, high dye uptake, bright color, high color fastness, good cloth surface quality.After dyeing, the hand feeling is softer than conventional polyester.

The invention relates to a bright-color gradient-color safety belt and a production process thereof, and relates to the technical field of fabric production processes, and the bright-color gradient-color safety belt comprises a gradient-color woven belt and a color optimization finishing agent, the color optimization finishing agent comprises the following components in parts by mass: 20-30 parts of nano disperse dye, 10-15 parts of an ultraviolet light absorber, 5-10 parts of mesoporous silica, 15-20 parts of a color fixing agent, 5-8 parts of an organic silicon softening agent, 2-4 parts of a fluorescent whitening agent, 1-2 parts of a pH buffering agent and 30-40 parts of a solvent. The production process comprises the following steps: weaving more than two yarns with different colors to obtain a gradient yarn-dyed woven belt; the preparation method comprises the following steps: removing impurities, flattening to obtain a treated braid, padding the treated braid in a color optimization finishing agent, washing with water, fixing color, shaping in cold water, drying after treatment, packaging and storing to obtain the gradient color safety belt with bright color. The gradient color safety belt has the effect of improving the optical performance, the color fastness and the structural stability of the gradient color safety belt, and has a good safety protection function and durability.

The application discloses a preparation method of a fabric with light-absorbing, heat-generating and antistatic composite functions. CuS nanoparticles are dispersed in a dispersion liquid, and tetraethyl orthosilicate is slowly added dropwise. After continuous stirring reaction, the reaction precipitate is dried to obtain silica-coated copper sulfide nanoparticles. The dispersion liquid is a mixed solution of ethanol, water and ammonia water. The silica-coated copper sulfide nanoparticles, disperse dye, crosslinking agent, surfactant, dispersant and deionized water are stirred and mixed, and ultrasonic dispersion is carried out. Then, the adhesive is added and stirred uniformly. Grinding particles are added to the mixed solution for grinding, and the grinding particles are removed through sieving to obtain a finishing liquid. The pretreated polyester fabric is pad-dyed in the finishing liquid, and is dried and solidified. Finally, the fabric product is obtained through washing and drying. The silica-coated copper sulfide nanoparticles realize the combination of light-absorbing, heat-generating, warm-keeping and static elimination functions, and the production cost is low, and the process is simple.

The application discloses a short-process printing process of polyester-cotton blended fabric, which comprises screen printing by using active disperse dyes containing double active groups and steaming by using alcohol vapor; the double active groups include hydroxyethyl sulfone sulfate group and CH2CH(OH)CH2X (X is Br or Cl); the CH2CH(OH)CH2X can be converted into an epoxy group under alkaline conditions and can react with the alcohol vapor during the steaming process to realize the cross-linking between dye molecules, so that the effects of improving the fixation efficiency and shortening the process flow are achieved, and then the printed fabric with high color depth and high color fastness is obtained.

The present application belongs to the technical field of textiles, and relates to a preparation method of a polyester fabric with a gradient dyeing effect, which comprises the following steps: after a fabric is woven from dynamic profiled yarns, the fabric is subjected to desizing and scouring treatment, and then is subjected to heat setting; subsequently, the heat-set fabric is immersed in a dye bath containing disperse dyes, and is subjected to dyeing by using a high-temperature and high-pressure dyeing method, so as to obtain a polyester fabric with a gradient dyeing effect; the cross-sectional shape of the monofilament of the dynamic profiled yarns periodically changes along the length direction, and the cross-sectional shape of the monofilament on each period is circular, flat and triangular in sequence. The present application realizes a differentiated dyeing effect, and simultaneously controls the timing of the nozzles, sets the cross-sectional change period, and makes the monofilament form a regular alternation of 'light-mid-dark' along the length direction, so that the finally prepared fabric presents a gradient dyeing effect after dyeing.

The present disclosure relates to the field of textile printing and dyeing technology, and particularly relates to an environmentally-friendly liquid dispersion dye with ultra-low pollution; the environmentally-friendly liquid dispersion dye is prepared by the following steps: preparing a Hippophae rhamnoides extract, dissolving the Hippophae rhamnoides extract in an acid solution and mixing with aluminum hydroxide; preparing a Ginkgo biloba extract, dissolving the Ginkgo biloba extract in an acid solution and mixing with aluminum hydroxide; then mixing the two in a sodium bicarbonate aqueous solution with a complexing agent and a stabilizer, drying to obtain a solid, and finally reacting the solid with polyethyleneimine to obtain an environmentally-friendly orange dye with good dispersibility.

The invention relates to a polyester fabric dyeing method which comprises the following steps: firstly, pretreating a polyester fabric, namely desizing, bleaching and heat setting; putting the pretreated polyester fabric into a dye vat at room temperature, heating, adding an alkaline leveling agent, a color fixing agent, a disperse dye and a pH regulator into the dye vat, heating, and keeping the temperature; cooling and discharging liquid in the dye vat; deionized water is added into the dye vat, the polyester fabric is washed with water, and the washed polyester fabric is subjected to softening treatment, tentering setting and antistatic treatment; and finally, carrying out secondary washing on the polyester fabric. The alkaline leveling agent, the color fixing agent, the disperse dye and the pH regulator are added in the dyeing process, so that the dye fully permeates into the fiber, and the dyeing uniformity is effectively improved; meanwhile, an environment-friendly color fixing agent is adopted, so that potential hazards to the environment and human bodies are reduced; after dyeing is completed, the polyester fabric is subjected to secondary washing, chemical substances remaining on the polyester fabric are removed, and the safety of the polyester fabric is guaranteed.

The invention provides digital jet printing ink for a degradable fiber material and a preparation method thereof, and relates to the technical field of digital jet printing ink, the digital jet printing ink comprises a disperse dye compound, a composite additive system and water; the compound additive system comprises at least one of a dispersing agent, a humectant and a wetting agent; the disperse dye compound is selected from specific disperse dye compounds with moderate molecular weight and strong low-temperature mobility. The digital jet printing ink is specially used for jet printing of degradable fiber materials, can fix color at the low temperature of 150-160 DEG C or below, has excellent color expression, fastness and environmental protection characteristics, and is very suitable for digital jet printing of green materials.

The present application relates to the field of printing dye technology, and more particularly to a photochromic printing dye, its preparation method, and its application. The photochromic printing dye provided herein is obtained by dispersing a disperse dye and microcapsules in an organic continuous phase. The disperse dye is selected from indigo dye, anthraquinone dye, or triarylmethane dye. The core material of the microcapsules is an oxidant, and the shell material of the microcapsules is a SiO2 complex. The printing dye provided herein contains microcapsules with an oxidant as the core material. During the washing process, the oxidant is slowly released from the shell material and has strong oxidizing properties. On the one hand, it can have a bactericidal effect. On the other hand, during the drying process, it can react with the disperse dye that is prone to photooxidation, causing the disperse dye to slowly decompose and fade.

The utility model belongs to the field of cleaning equipment, and relates to a banner printer and an advertisement banner, in particular to a cloth washing machine for cleaning the advertisement banner, which comprises a machine table, a pressing and soaking module used for pressing advertisement banners into the ultrasonic cleaning machine, a flushing module used for flushing the surfaces of the advertisement banners and a water squeezing module used for squeezing out water in the advertisement banners are arranged above the ultrasonic cleaning machine, and a water circulation module and a water quality purification module are further arranged on the lower portion of the machine table. The advertisement banner cleaning device comprises a pressing and soaking module used for pressing an advertisement banner into an ultrasonic cleaning machine, the ultrasonic cleaning machine used for cleaning, a flushing module used for flushing the surface of the advertisement banner and a water squeezing module used for squeezing out water in the advertisement banner, and the multiple modules are matched to complete deep cleaning of the advertisement banner. And the disperse dye in the non-printed color development area of the advertisement banner falls off.

The invention provides a temperature-controllable disperse dye reaction kettle, and relates to the technical field of reaction kettles, the temperature-controllable disperse dye reaction kettle comprises an outer kettle shell, the outer kettle shell is made of a high-strength material, can stably support internal components, isolates interference of an external environment on reaction in the kettle, and plays a core role in overall supporting and protection; the outer kettle shell is internally provided with an inner kettle, the inner kettle is made of a corrosion-resistant material with adaptive heat-conducting property and can be in direct contact with a disperse dye reaction system, the middle-layer heat exchange pipes are uniformly distributed along the inner wall of the inner kettle in the circumferential direction, so that the local temperature deviation in the kettle can be accurately compensated, and the temperature gradient and the micro-level of the edge and the center are avoided; the heat conduction oil is introduced into the hollow channels of the hollow stirring shaft and the paddles, and is matched with the heat dissipation holes in the surfaces of the paddles, so that a heat exchange function is permeated to a material core area, the problem of disperse dye colored light deviation caused by uneven temperature is greatly reduced, meanwhile, dye particle aggregation is effectively inhibited, and the stability and consistency of dye products are remarkably improved.

The invention relates to the technical field of textile printing and dyeing, and particularly discloses a disperse dye as well as a preparation method and application thereof. The disperse dye provided by the invention comprises a disperse pigment and an auxiliary agent, the auxiliaries comprise ionic liquid containing imidazolyl, sodium gluconate and sucrose stearate. According to the invention, specific components of the auxiliary agent in the disperse dye are limited, and all the components have a synergistic effect, so that the structural stability of the disperse pigment in an alkali and hydrogen peroxide coexistence environment is obviously improved, and the dyeing uniformity and stability of the disperse dye on polyester-cotton knitted fabric can also be improved.

The invention relates to the field of disperse dye production, and discloses environment-friendly disperse dye production equipment which comprises a tank body, a base assembly is arranged at the bottom of the tank body, a feeding port is formed in the top of the tank body, a discharging port is formed in the side face of the tank body, and a stirring structure is arranged in the tank body. Two groups of auxiliary stirring assemblies capable of independently rotating are arranged on the side surface of the stirring structure, and the stirring structure can drive the auxiliary stirring assemblies to rotate, so that compared with the traditional equipment which has the problems of high water resource consumption and much wastewater discharge, the equipment has the advantages that the adaptability of a tank body sealing structure and a production process is optimized; the dissipation of the dye and the auxiliaries in the production process is effectively reduced, and the pollution to the air environment is reduced. Meanwhile, the efficient stirring system can shorten the material mixing time and indirectly reduce the water resource and energy consumption in the production process.

The invention belongs to the technical field of textile dyeing and finishing assistants, and discloses a high-efficiency level dyeing assistant for dyeing and finishing and a preparation method thereof, the assistant is formed by assembling an amphiphilic block copolymer and a dynamic reversible covalent bond polymer, the block copolymer has hydrophilic and oleophylic sections, nano-scale micelles are formed through self-assembly, and the nano-scale micelles are uniformly dispersed in the dynamic reversible covalent bond polymer. Dye molecules can be efficiently captured, slowly released and stably dispersed; a reversible ketoxime bond is introduced into a main chain of the dynamic polymer to form a cross-linked network with micelles, so that the assistant keeps a stable structure under a dyeing condition; after dyeing and finishing are finished, reversible bond breakage is triggered through acid-base adjustment or reducing agent treatment, micelles are rapidly depolymerized, and the auxiliaries are recycled and can be repeatedly used; the auxiliary agent can significantly improve the uniform dispersion of dye in dye liquor and the color consistency of fabric, enhance the color fastness, reduce the dosage of the auxiliary agent and reduce the wastewater treatment load, and has good environmental protection and cyclic utilization performance.

The invention discloses a high-fastness disperse blue dye as well as a preparation method and application thereof, and belongs to the technical field of disperse dyes. The dye comprises the following raw materials in parts by weight: 45-50 parts of a component A, 0-18 parts of a component B and 46-62 parts of an auxiliary agent. The general formula of the component A is the general formula of the component B. The preparation method comprises the following steps: (1) weighing the raw materials; and (2) uniformly mixing to obtain a finished product. The high-fastness disperse blue dye disclosed by the invention has excellent wet treatment fastness such as washing resistance and perspiration resistance and high sublimation fastness, overcomes the defect of the existing dye in fastness performance, complements and perfects the chromatography of the high-fastness disperse blue dye, especially fills the blank of no high-sublimation-fastness sapphire blue and brilliant blue series in printing and pad dyeing processes, and has the advantages of high fastness, high fastness, high fastness and the like. The use requirements of various high-end textiles under different dyeing processes can be met.

The application provides a red disperse dye composition with a low metamerism index and a preparation method and application thereof. The red disperse dye composition comprises 1-5% of C.I. Disperse Red 362, 25-50% of C.I. Disperse Red 91 and 45-70% of C.I. Disperse Red 92 in terms of mass fraction. Through the synergistic complementation of C.I. Disperse Red 362, C.I. Disperse Red 91 and C.I. Disperse Red 92 in color and spectral characteristics, the red disperse dye composition of the application is consistent with C.I. Disperse Red 60 in color and spectral characteristics, does not cause metamerism under any light source, has a very low condition metamerism index (MI) in the dyeing of textiles, and even the MI value can be ≤0.6, which meets the relevant provisions in "Textile Color System: FZ / T 01099-2021".

This invention discloses a class of quinalidine disperse yellow dyes with high sublimation fastness and their synthesis method, belonging to the field of disperse dye technology. This invention uses Disperse Yellow 54 as the parent core and introduces one of the following substituents at the 6-position of the quinalidine ring: ethyl, n-propyl, cyclopropyl, cyclobutyl, cyclopropylmethyl, methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, cyclopropoxy, cyclobutoxy, cyclopropylmethoxy, 2-methoxyethoxy, fluorine, chlorine, bromine, cyano, or nitro. This invention uses 6-substituted-2-methyl-3-hydroxyquinoline-4-carboxylic acid and phthalic anhydride as raw materials, and synthesizes the target dye in one step via a high-temperature condensation reaction. Experimental results show that the sublimation fastness of the dye of this invention reaches grade 4-5 or 5, significantly improved compared to Disperse Yellow 54 (grade 2-3), while maintaining excellent resistance to rubbing, perspiration, and sunlight. This invention has a simple synthesis process, high yield, and high purity, possessing extremely high industrial production value and market application prospects.

The invention discloses an azo compound as well as a preparation method and application thereof, belongs to the field of dye chemical industry, and particularly provides the azo compound which is of a structure as shown in a general formula I. The azo compound disperse dye disclosed by the invention has excellent pH dependency and thermal migration resistance, and is especially suitable for dyeing application of polyester-cotton fabrics.

The invention discloses a disperse dye dyeing machine and method for regenerated polyester fibers, and belongs to the technical field of cloth dyeing. The disperse dye dyeing machine comprises a treatment table and a dyeing tank located on the other side of the treatment table, a drying frame is arranged on the other side of the dyeing tank, and a drying box is installed in the middle of the top of the drying frame; a drying frame is arranged at the top of the treatment table, guide frames are arranged at the positions, close to the two sides, of the top of the drying frame, a plurality of guide rollers are arranged in an inner cavity of the dyeing tank, a supporting roller A is fixedly installed in the middle of the top of the treatment table, and U-shaped plates are fixedly installed at the positions, close to the two sides, of the top of the treatment table. By means of the device, batting and dust on the surface of cloth can be subjected to adhesion treatment through an adhesive tape on the unwinding roller, the used adhesive tape can be continuously wound under rotation of the fixing shaft B, the batting and dust treatment effect on the cloth is improved, and the dyeing effect of the follow-up regenerated polyester fiber cloth is facilitated.

The present invention discloses a high-temperature type blue to black disperse dye composition, comprising component A of formula (I), component B of formula (II), component C of formula (III), component D of formula (IV) and / or (V), the high-temperature type disperse blue to black dye product prepared by the present invention has good washing fastness and water bubble fastness when dyeing hydrophobic fiber materials.

The invention belongs to the field of textile chemistry, and particularly relates to a water-ethanol synergistic flame-retardant polyester fiber non-aqueous dyeing method. The invention relates to a water-ethanol synergistic flame-retardant polyester fiber non-aqueous dyeing method, which comprises: S1, dyeing: compounding water and ethanol to form an auxiliary agent, and placing the auxiliary agent in an isohexadecane non-aqueous dyeing system containing a disperse dye to form a dyeing liquid; immersing flame-retardant polyester fibers into the dye liquor for dyeing; on the basis of the mass of 1 g of the fiber, the use amount of the isohexadecane is 10-60 mL, the use amount of the auxiliary agent is 0.25-2 mL, and the volume ratio of the water to the ethanol is 1: 9-9: 1; s2, soaping: after the dyeing step is completed, putting the dyed fibers into soaping liquid for soaping so as to remove flooding. The method has the characteristics of energy conservation, environmental protection, no pollution, good leveling property of the dyed fiber, good color fastness and the like.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an emission reduction method for disperse dye production wastewater. The method comprises the following steps: neutralizing disperse dye mother liquor with industrial magnesium oxide, magnesium hydroxide or magnesium carbonate, and filtering to obtain clarified and neutralized mother liquor containing magnesium sulfate; using the neutralized mother liquor for diluting the disperse dye coupling completion material, then heating for crystal transformation, filtering and washing to obtain a dye filter cake and a salt-containing acidic mother liquor; and neutralizing the salt-containing acidic mother liquor with a magnesium compound, and filtering to obtain a clarified and neutralized mother liquor. And carrying out multiple-effect evaporation concentration and crystallization on the neutralized mother liquor exceeding the recycling amount to extract magnesium sulfate, and using evaporation condensate water for washing a disperse dye filter cake. The neutralization mother liquor is used for replacing clear water to dilute the disperse dye coupling completion material, the viscosity and acidity problems in disperse dye synthesis are solved, the product quality and yield are not affected, the mother liquor is reduced, the water consumption is reduced, meanwhile, the salt concentration of the neutralization mother liquor is increased, and the wastewater evaporation crystallization energy consumption is reduced.

The utility model relates to an environment-friendly waste gas treatment device for disperse dye production, which belongs to the technical field of disperse dye production and comprises a mounting base, a treatment tank is fixedly mounted at the top of the mounting base, and a hollow pipe is rotatably mounted on the inner side wall of the treatment tank. According to the environment-friendly waste gas treatment device for disperse dye production, a rotatable hollow pipe is arranged in a treatment tank, a branch pipe is arranged on the surface of the hollow pipe, exhaust holes are formed in the surface of the branch pipe, waste gas is introduced into the hollow pipe, the waste gas is introduced into treatment liquid in the treatment tank through the exhaust holes in the surface of the branch pipe, and meanwhile the hollow pipe rotates; and the branch pipe is driven to stir the treatment liquid and the exhaust hole is driven to change positions, so that the treatment liquid is in full contact with the waste gas, and the problems that the waste gas is directly introduced into the bottom of the treatment liquid, harmful substances in the waste gas are treated, the waste gas directly rises in the treatment liquid, and the harmful substances and the treatment liquid are easily in insufficient contact are solved.

The present invention relates to compounds of formula (I) wherein R1 is a dye and L1, R2 and R3 are as defined herein. The compounds of the invention reversibly convert from a hydrophobic form to a hydrophilic form upon contact with water and carbon dioxide. The invention also relates to a method for dyeing fibers and a method for decolorizing dyed fibers. The method is particularly suitable for dyeing polyester fibers. (I)

To perform decolorizing treatment efficiently.SOLUTION: A decolorizing device 1 comprises a processing tank 23 of a decolorizing part 2 for containing a decolorizing liquid Q, a processing tank 43 of a rinsing part 4 for containing a rinsing liquid, and a conveying part 10 for conveying a workpiece W including fibers dyed or colored with a disperse dye, wherein the decolorizing device 1 decolorizes the workpiece W by continuously conveying the workpiece W to the processing tank 23 and the processing tank 43 in sequence by means of the conveying part 10.SELECTED DRAWING: Figure 1