49 results about "Vat dye" patented technology

The invention discloses a yellow reduction dyeing agent, a dyeing solution and a preparation method and application thereof, and relates to the technical field of dyeing and finishing. According to the yellow reduction dyeing agent provided by the invention, the 5-hydroxy-3-aminopyridine-2, 6-(1H, 3H)-diketone is adopted as a reduction dye, and the sodium sulfite is independently used as a reducing agent for reduction dyeing, so that the obtained dye leuco body is proper in dyeing capacity, and a dyed fabric can show excellent light brittle damage resistance. The fabric dyed by the dyeing agent has similar breaking strength before and after dyeing and even is slightly improved after dyeing and illumination, meanwhile, the color depth K / S of the fabric dyed by the dyeing agent reaches 3.2 or above, the dry and wet rubbing color fastness can reach level 4 or above, and the color fastness to illumination reaches level 6 or above.

The invention relates to the field of C01B17 / 69, in particular to a dilute sulphuric acid concentration and desalination technology for dye production, waste sulphuric acid generated in the vat dye production process is automatically and efficiently treated by designing three-stage evaporation concentration, freezing crystallization and centrifuge desalination technologies, the waste sulphuric acid is concentrated to the concentration of 93-95%, resource recycling is achieved, and the cost is reduced. Meanwhile, inorganic salt in the waste sulfuric acid is fully separated, so that the regenerated sulfuric acid obtained after treatment meets actual use standards and requirements; the energy consumption is low, the efficiency is high, the operation treatment capacity is large, the waste acid treatment capacity reaches up to 27000 tons per year, and huge market application potential is embodied; the method is simple in process, high in operation automation control level, safe, stable and stable in operation, large-scale continuous production can be realized, and an efficient, safe, economical, continuous and reliable treatment method is provided for treatment of waste acid generated in the vat dye production process.

The invention belongs to the technical field of textile printing and dyeing, and relates to a wool vat dye dyeing process based on high-alkalinity low-temperature dyeing. The technology comprises the following steps: dissolving vat dye, a penetrant, Na2SO4 and sodium hydrosulfite in water, adjusting the pH value, and carrying out a reduction reaction to obtain dye liquor; immersing the wool textile into the dye liquor for dyeing, and maintaining the pH during dyeing; washing the wool textile with water, then adjusting the pH value of the H2O2 aqueous solution, and immersing the wool textile for oxidation treatment; sodium hydrosulfite and NaOH are dissolved in water to obtain a cleaning solution, and the wool textile is immersed in the cleaning solution for reduction cleaning treatment. Wool disulfide bond breakage and fiber swelling are promoted under the alkaline condition, dye is fully permeated at the low temperature, dyeing uniformity is ensured, color fastness is improved, the dye utilization rate is increased, the color vividness, saturation and stability are improved, the light fastness reaches the level 4-5, and wool medium-color and dark-color dyeing of the vat dye is achieved.

The invention discloses a method for dyeing a brocade cotton fabric through vat dye long-vehicle continuous pad dyeing, and belongs to the technical field of printing and dyeing processing and dyeing and finishing engineering. The dyeing method comprises the following steps: padding a brocade cotton fabric semi-finished product in a vat dye liquor, drying, cooling, padding in a vat color developing working solution, and finally steaming, the steamed fabric is subjected to cold water washing, oxidation, soaping, hot water washing, continuous cold water washing and drying finally, and dyeing is completed. According to the invention, a long-vehicle continuous pad dyeing technology is adopted, and synchronous dyeing of the vat dye on two heterogeneous fibers nylon and cotton is realized by padding a reduction developing working solution (the main components of which comprise caustic soda, sodium carbonate, sodium hydrosulfite and industrial salt) and performing steaming developing. The production process is short, the fabric cloth cover leveling property is good, the light fastness is high, and the problem that acid dye dyed chinlon fabric is not resistant to high-temperature washing is solved.

This invention discloses a 1,6-diamino-dibenzo[a,o]perylene-7,16-dione-2,5-disulfonic acid derivative, its preparation method, and its application. Using a vat dye derivative PR177 as the parent material, a 4,4'-diamino-1,1'-dianthraquinone-3,3'-disulfonic acid derivative is formed by the Ullmann condensation of a 1-amino-4-bromoanthraquinone-2-sulfonic acid derivative. This derivative is then cyclically closed via the McMurray reaction to form the 1,6-diamino-dibenzo[a,o]perylene-7,16-dione-2,5-disulfonic acid derivative. This allows for direct dyeing without the use of sodium hydrosulfite. Compared to soluble vat dyes, it is stable when exposed to air. Furthermore, due to its good planarity, it exhibits excellent dyeing performance as an acid dye. It combines the advantages of good directness of vat dyes and good water solubility of acid dyes, especially showing excellent color fastness and exhaustion rate in wool dyeing.

The present invention discloses a reducing dye dispersant, its application and a preparation method of a reducing dye. The reducing dye dispersant is an aqueous solution of a copolymer and an alkali. The copolymer is one or more of an ethylene-maleic anhydride alternating copolymer, a propylene-maleic anhydride alternating copolymer, and an isobutylene-maleic anhydride alternating copolymer. Different from a graft copolymer, this copolymer is an alternating copolymer, and the ethylene, propylene, and isobutylene groups and the maleic anhydride groups in its structural units alternate. Since the basic unit of the olefin-maleic anhydride alternating copolymer is a hydrophobic olefin unit and a hydrophilic maleic group after being dissolved by an alkali, the molecule has amphiphilicity. Different from a small molecule dispersant, this dispersant can form a self-assembled structure in the reducing dye dispersion liquid, better wrap the reducing dye colloidal particles, and thus exhibit better dispersion performance. This dispersant only contains three elements of carbon, hydrogen, and oxygen, does not contain elements such as N and S, and has high environmental friendliness.

The application provides a dyeing solution and a dyeing method for para-aramid. The dyeing solution comprises polyester paste, ethylene glycol phenyl ether, dye mother liquor, pH regulator and solvent. The dyeing solution is most favorable for dyeing under the synergistic effect of ethylene glycol phenyl ether, polyester paste powder and sodium carbonate, and the dyeing effect gradually improves with the increase of the ratio of the three. The dyeing method specifically comprises the following steps: soaking para-aramid fibers in water, adding polyester paste and pH regulator, then performing temperature raising and holding treatment, then adding ethylene glycol phenyl ether for treatment, and finally adding dye mother liquor for dyeing. The method can efficiently utilize the carrier, reduce the carrier dosage, and ensure the fiber dyeing effect. After the dyeing depth is improved, the excellent sunlight resistance of the vat dye is utilized.

The present application relates to the technical field of dyeing and finishing, and in particular to a weakly alkaline pH reduction dyeing method using N-acetyl indigoidine and a use thereof. It is found in the present application that N-acetyl indigoidine is a novel vat dye, meets the safety assessment requirements for textile dyes, and can be applied to textile dyeing. The present application discloses a weakly alkaline pH reduction dyeing method using N-acetyl indigoidine for textiles; the dyed textiles have significantly improved color depth, brighter color, and good color fastness, and meet the national standards for textile dyeing; and the content of reducing agents is reduced, thereby reducing environmental pollution.

The present invention relates to the technical field of printing and dyeing wastewater treatment, and specifically discloses a method for treating vat dye wastewater, comprising the following steps: subjecting the vat dye wastewater to an electroflocculation treatment, sequentially adding an adsorbent and a hydroxy silicone oil emulsion to the treated wastewater for flocculation and precipitation treatment in stages; wherein the adsorbent is diatomaceous earth or diatomaceous earth modified with an aminosilane coupling agent. The method for treating vat dye wastewater provided by the present invention utilizes a diatomaceous earth adsorbent in conjunction with a hydroxy silicone oil emulsion to promote the adsorption, coupling, and re-flocculation of flocs generated by the electroflocculation reaction, effectively enhancing the structure of the flocs, increasing the specific gravity of the flocs, increasing the flocculation speed, and shortening the sedimentation time, thereby significantly improving the treatment effect and efficiency. The national emission standards can be met through simple filtration, and the process is simple, does not require special equipment, is low in cost, has high applicability, does not cause secondary pollution, and has high practicality.

Methods and compositions for coloring keratinous substrates, such as mammalian hair and in particular human hair, use oxidative dye precursors comprising pyrazole primaries and couplers, and solubilized vat dyes. The methods and compositions improve the wash fastness of hair color produced by oxidative dyes, wherein one or more of the oxidative dyes are derived from oxidative dye precursors comprising a pyrazole primary and a coupler.

The present invention relates to a fabric printing method and system with reduced dyes, in particular indigo dye. The object of this invention consists in a method for printing a fabric with a dye and a fabric printing system comprising at least one printing module configured to apply dyeing paste to a fabric surface; at least one oxidation chamber comprising an internal cavity filled by an oxidizing gaseous mixture; a fabric-feeding device configured to feed a fabric sheet through the printing module and the oxidation chamber; wherein each printing module comprises a plurality of print heads, at least one main reservoir; a plurality of sub tanks; a main circulation pathway and a recirculation pathway. The proposed invention consists in a fabric printing method and fabric printing system aimed to solve the limitations of industrialized indigo printing.

The invention relates to the technical field of textile dyeing processes, and discloses a loose fiber cotton reduction dyeing high-precision control and high-fastness dyeing method which comprises the following steps: S1, high-precision bath ratio control: calculating an actual bath ratio by measuring the relationship between the liquid level of a dye vat and the water volume and combining fiber volume expansion compensation; s2, dyeing uniformity is optimized, non-uniform local pressure of the fibers is reduced in a low-pressure cake making and cylinder filling mode, and the stirring frequency is adjusted in different dyeing stages through variable-frequency stirring control; s3, performing reduction dyeing and secondary reduction, namely reducing the reduced dye under an alkaline condition, slowly heating to a target temperature within a controlled temperature range so that the dye is uniformly adsorbed to the surface of the fiber, and performing secondary reduction by adopting a low-concentration reducing agent and alkali after dyeing is completed. Through a low-pressure cake making and cylinder filling mode, uniform permeation of dye liquor is achieved, local chromatic aberration is avoided, dye diffusion is matched with requirements of different stages through variable-frequency stirring control, and dyeing uniformity is improved.

The invention relates to the technical field of knitted fabrics, and particularly discloses a white discharge printing style knitted fabric and a preparation method thereof. Comprising the following steps: S1, pre-treating and drying a knitted fabric gray fabric; s2, treating a wax printing material on the dried fabric through a stencil scraping printing or stencil brush printing method to form a required pattern design, and cooling to solidify the wax printing material; s3, performing cold pad-batch dyeing on the fabric subjected to wax printing by using a reactive dye; s4, performing soaping to remove flooding on the surface of the fabric, so that wax adhered to the fabric falls off and is removed; s5, drying the fabric to obtain the white discharge printing style knitted fabric. According to the method, a white discharge printing style similar to that of a traditional woven fabric can be obtained without adopting a traditional white discharge auxiliary or a special vat-intolerant dye, the white discharge printing pattern is clear, the whiteness of uncolored base cloth is good, the sewage treatment cost is lower, the production mode is more environment-friendly, semi-continuous production can be realized, and the production efficiency is higher.

The invention belongs to the technical field of textile dyeing, and particularly relates to a reduction dyeing method in a salt-free low-water environment by utilizing a vat dye and application of the reduction dyeing method. The dyeing method comprises the following steps: S1, dispersing vat dye in an alcohol reagent to form a dyeing liquor mother solution; s2, a reducing agent and a coupling agent are added into the dyeing mother liquor for reduction, the pH value is adjusted to 7.5-10, and reduced dyeing mother liquor is obtained; and S3, diluting the reduction dyeing mother solution to obtain a reduction dyeing solution, putting the to-be-dyed fiber pretreated by the alcohol reagent into the reduction dyeing solution for dyeing, and cleaning and drying the fiber after dyeing is finished, the vat dye comprises an ornamental blue derivative dye. The invention provides an innovative salt-free low-water reduction dyeing method, the environmental protection and high efficiency of the dyeing process are realized by reducing the use of chemical substances and the consumption of water resources, and the salt-free low-water reduction dyeing method has important significance for promoting the green transformation of the textile industry.

The invention relates to a distorted condensed ring blue vat dye with pyrazine and oxazine structures and a preparation method and application thereof, and discloses a preparation method and application of a blue vat dye with a certain distorted structure. According to the blue dye, different conjugated units are creatively connected in parallel through oxazine and pyrazine fused rings, the conjugated structure of molecules is expanded, the absorption wavelength of the molecules is subjected to red shift, and meanwhile, the fused rings provide high rigidity and stability for the molecules. In addition, the heterocyclic structure of oxazine and pyrazine also provides certain distortion for molecules, so that accumulation among molecules is improved, certain solubility of the molecules is ensured, and intramolecular charge transfer is enhanced. Through the design, the absorption spectrum, the light stability, the heat stability and the acid-base stability of the molecule are improved, and huge potential is provided for the molecule as a novel blue vat dye.

The invention discloses a preparation method of a red vat dye, and relates to the technical field of compound preparation. According to the preparation method of the red vat dye provided by the invention, a halogenated benzoylation reagent is adopted to replace a primary amino group on an ornamental blue parent nucleus, so that the color of the ornamental blue derivative dye can be adjusted to enable the ornamental blue derivative dye to finally present red; according to the invention, the washing liquor compounded by ethanol, ethyl acetate and petroleum ether in a volume ratio of (1-5): (1-2): 1 is used for washing the reaction product, and based on regulation and control on solubility, surface tension and the like, the purity and the yield of the red vat dye product can be synchronously improved, so that the purity of the product is up to 98.9% or above, and the yield is up to 73.01% or above.

The invention belongs to the technical field of textile printing and dyeing, and particularly relates to a camouflage printing process with high lasting color saturation and fastness and a camouflage fabric, and the printing process is used for sequentially treating the fabric by the following steps: fabric pretreatment, printing and functional after-treatment; the step of printing comprises the following procedures: printing, drying, ageing, baking, reducing and fixing, washing, oxidizing and soaping, fixing and washing; wherein a circular screen printer is adopted for printing, and printing paste comprises acid dye, vat dye, printing paint, an adhesive, a thickening agent and water; in the ageing process, padding in a reducing solution; the functional after-finishing comprises the following procedures: tentering, washing and checking; wherein the tentering process sequentially comprises the steps of padding a finishing liquid and baking and curing. The process is simple and environment-friendly, and the obtained fabric is high in color fastness to washing. The invention also provides the camouflage fabric prepared by the process.

The application discloses a kind of electrocatalytic hydrogenation reduction devices of vat dyes, it is related to electrocatalysis technical field, including cathode groove block and anode groove block, the opposite side of cathode groove block and anode groove block is equipped with electrolytic component in common, the electrolytic component includes first sealing strip, ion exchange membrane, anode material, cathode material, second sealing strip, electrolytic component and cathode groove block and anode groove block are commonly connected with multiple fixed screw between, the rear side of multiple fixed screw rod wall is all connected with fixed nut in thread, the top surface of cathode groove block is equipped with ventilation component.The application solves the problems of low production efficiency, high energy consumption, the need to carry out pure chemical hydrogenation and other problems in the production of existing electrocatalytic hydrogenation reduction of vat dyes, the device catalytic oxidation speed is fast, energy consumption is low, only consumes electric energy, does not add any chemical reagent, no secondary pollution, operation is safe, simple, system operation degree of automation is high, no manpower operation burden.

The invention discloses vat dye suitable for chinlon fabric and a dyeing method, and belongs to the technical field of chinlon fabric dyeing, the vat dye is selected from any two or three of yellow vat dye, red vat dye and blue vat dye, the yellow vat dye is selected from at least one of C.I. Vat yellow 1 and C.I. Vat yellow 2, and the red vat dye is selected from at least one of C.I. Vat yellow 1 and C.I. Vat yellow 2. The red vat dye is selected from at least one of C.I. Vat red 10 and C.I. Vat red 13, and the blue vat dye is selected from at least one of C.I. Vat blue 4 and vat dye blue DMG; through research and experiments, the vat dye composition is researched and developed, the selected vat dye is used for dyeing chinlon, has good compatibility, is suitable for blending in various proportions, has bright color, is simple in dyeing process, and has excellent color fastness, and especially, the washing fastness and the rubbing fastness basically reach 4-5 levels or above.

A plant for dyeing yarn ropes is disclosed, which comprises at least one dyeing machine provided with an openable and / or removable upper lid, at least one device for squeezing the yarn ropes and at least one oxidation pathway in an atmospheric environment of the yarn ropes. Between a point for the entry of the yarn ropes in the at least one dyeing machine and a point for the exit of the yarn ropes from the at least one oxidation pathway there is obtained a first dyeing / oxidation pathway. Between the point for the exit of the yarn ropes from the at least one oxidation pathway and the point for the entry of the yarn ropes in the at least one dyeing machine there is instead obtained a pathway for the return of the yarn ropes, which overlies both the at least one dyeing machine and the at least one oxidation pathway at a predefined height from the ground. Between the point for the entry of the yarn ropes into the at least one dyeing machine and the point for the exit of the yarn ropes from the at least one oxidation pathway there is therefore obtained at least one second pathway for dyeing / oxidising the yarn ropes, which is parallel and coplanar with respect to the first pathway for dyeing / oxidising the yarn ropes, so as to avoid any overlapping of the yarn ropes both inside the at least dyeing machine and at the at least one oxidation pathway.

The invention discloses a brocade / cotton fabric vat dye one-bath process homochromatic dyeing method which comprises the following steps: (1) weighing raw materials, and adding water to dilute and melt the materials; adding water into a dye vat, and then adding the molten raw materials; (2) after the dyeing machine runs for 3-5 minutes, putting the brocade / cotton fabric into the dyeing machine, heating to a set temperature at a speed of 1 DEG C / min for dyeing, and dyeing at a constant temperature for 30-40 minutes; (3) cooling to room temperature, and leaching with water for 5-10 minutes so as to carry out air oxidation color development; (4) feeding water into the dye vat again to a soap boiling bath ratio, adding a soap boiling agent, heating to 95 DEG C, and performing soap boiling for 10-15 minutes; and (5) cooling, discharging water, washing the brocade / cotton fabric with water, and drying. The method has the advantages of short flow, energy conservation, consumption reduction, pollution reduction, good homochromatism, excellent color fastness and the like.

The description provides an apparatus for dyeing a textile support, the apparatus comprising a single cylinder having, sequentially arranged within therein: a first cavity having a watertight function between the surrounding environment and the cylinder; a first internal partition wall immersed in the lower portion of the dye liquor in the first cavity to facilitate the watertight function; a first dyeing separation chamber and at least one second dyeing separation chamber, each dyeing separation chamber including at least one return roller for the textile support, at least one dispensing device for dispensing dye liquor onto the textile support, and at least one extrusion device; a second cavity containing dye liquor having a watertight function between the cylinder and the surrounding environment; and a second internal partition wall immersed in the lower portion of the dye liquor in the second cavity to facilitate the watertight function. The dyeing apparatus further includes: at least one cover that closes the cylinder at the top and watertightly isolates the dyeing compartment from the surrounding environment; a motorized extrusion and traction device configured to pull the textile support out of the cylinder and remove excess liquid therefrom once it leaves the cylinder; a hydraulic system for feeding the dye liquor into the dispensing device and the cavity; one or more devices for blowing air, designed to increase the oxidation level of the textile support once it leaves the cylinder; at least one ultrasonic generator designed to increase the bath dyeing effect of the dye liquor; and a device for heat-conditioning the dye liquor to further enhance the coloring performance.

The embodiment of the invention discloses a dyeing method of a polyester-cotton core-spun yarn fabric. The dyeing method comprises the following steps: pretreating the polyester-cotton core-spun yarn fabric; mercerizing the polyester cotton core-spun yarn fabric; dyeing the mercerized polyester-cotton core-spun yarn fabric, specifically comprising the following steps: carrying out one-bath bottoming by adopting a bottoming working solution; the bottoming working solution comprises a reactive dye and a vat dye for dyeing cotton fibers, and a disperse dye for dyeing polyester fibers; adopting high-temperature baking to color the polyester fibers with the disperse dye; padding sodium hydrosulfite liquid caustic soda, steaming and oxidizing by saturated steam, and coloring the cotton fibers by using the reduced dye; baking the dyed polyester-cotton core-spun yarn fabric so as to dye the polyester fibers on the dispersed fuel and increase the dyeing of the cotton fibers by the reactive dye at the same time; carrying out steaming reduction treatment on the baked polyester-cotton core-spun yarn fabric so as to fully dye cotton fibers; and finishing the polyester-cotton core-spun yarn fabric subjected to steaming reduction treatment to obtain the polyester-cotton core-spun yarn fabric.

This invention provides a method for dyeing with vat dyes in an overflow dyeing machine. The use of a dye premix significantly improves dyeing performance. The cationic properties of modified cationic starch electrostatically adsorb onto fabric fibers, allowing the coated dye particles to quickly and evenly adhere to the fabric surface. This avoids localized color differences caused by uneven dye dispersion in the dye bath, and the water flow impact in overflow dyeing prevents localized dye aggregation, effectively improving dyeing uniformity and ensuring consistent dyeing results for the same batch of fabrics. The stable structure formed by the cross-linking of modified cationic starch and vat dye forms a protective film on the fabric fiber surface after color fixation, enhancing the binding stability between the dye and fiber, reducing damage to dye molecules from external factors such as light, improving the dye's lightfastness and the fabric's sunlight fastness. Its film-forming properties also make the dye and fiber bond more firmly, preventing fading.

This invention discloses a multi-site ozone catalytic oxidation decolorization tower for wastewater from vat dye production, belonging to the field of industrial wastewater treatment technology. The technical problem to be solved is to improve the contact and mixing efficiency of wastewater and ozone, and to improve ozone utilization and wastewater decolorization quality. The key points of the technical solution are: the main body of the decolorization tower is equipped with a diversion reaction component, a gas conveying component, and an ultrasonic component. The diversion reaction component disperses and conveys the wastewater to multiple Venturi tube assemblies, which form a flow velocity difference. Combined with the spiral blade assembly, the wastewater flows in a spiral. The gas conveying component uniformly delivers ozone, and the ultrasonic component generates ultrasonic waves to promote the reaction. This decolorization tower fully mixes wastewater and ozone through the flow velocity difference, spiral flow, and ultrasonic cavitation. It also realizes ozone recycling and wastewater recycling treatment, and allows for observation of color changes and detection of ozone content. It is suitable for industrial wastewater treatment.

A description is provided of an apparatus for dyeing a textile support comprising a single tank which is provided in its interior, in sequence, with: one first shaped cavity having a watertight function between the surrounding environment and the tank; one first internal partition wall, which is immersed in the lower part in the dye bath of the first shaped cavity for helping the watertight function; one first dyeing compartment and at least one second dyeing compartment which each comprise at least one return roller for the textile support, at least one dispensing device to dispense the dye bath on the textile support, and at least one squeezing device; a second shaped cavity containing the dye bath having a watertight function between the tank and the surrounding environment; and a second internal partition wall, which is immersed in the lower part in the dye bath of the second shaped cavity for helping the watertight.

The present invention relates to a high-fastness UV-curable coating method for spun yarn for denim fabric, the method replacing a conventional dyeing process, thereby having limitations in color implementation and providing excellent flame-retardant performance. According to the present invention, the high-fastness UV-curable coating method for spun yarn can be provided, the method using an ultraviolet-curable yarn dyeing technique in which a 100% solid UV resin, rather than a reduction dye and a dye solution used in a conventional dyeing process of spun yarn that can be used for denim fabric, is used so that harmful volatile organic compounds (VOCs) are not emitted, solving environmental problems that occur during manufacturing by not using solvents such as water, and enabling high productivity and energy consumption reduction to be achieved through rapid polymerization.

The application provides a clean and efficient electrochemical flow reaction device for vat dyes, which comprises a cathode electrolysis module, an anode electrolysis module and an ion exchange film, the cathode electrolysis module and the anode electrolysis module are arranged on the two sides of the ion exchange film, the outer sides of the cathode electrolysis module and the anode electrolysis module are provided with shell plates, the cathode electrolysis module comprises a cathode functional plate and a cathode plate, the anode electrolysis module comprises an anode functional plate and an anode plate, two pipes for liquid inlet and liquid outlet are arranged on the cathode functional plate and the anode functional plate respectively, the two sides of the ion exchange film are provided with films, the inner sides of the shell plates are provided with insulating plates, and the inner sides of the insulating plates are provided with backing plates. The device has the advantages of simple structure, convenient disassembly, assembly and modification, low cost, easy availability of the materials of the functional plate modules, selection of appropriate functional plates, ingenious design of electrodes, expansion of the electrode plate area, expansion of the electrode area, sufficient contact with the electrolyte, and great improvement of the electrolysis efficiency of the system.

The invention discloses a method for reducing color development difference between an anthraquinone vat dye in a long vehicle and a laboratory, and belongs to the technical field of fabric dyeing. By adopting the treatment process, the color and light difference between a laboratory imitated sample and a long vehicle dyed fabric is obviously reduced, and the international standard is met; in addition, the consistency qualification rate of the long vehicle in the treatment process is increased from 30% to 80% or above, and repair and color hooking work is reduced; meanwhile, pretreatment and dyeing parameters in the treatment process are standardized, the difference caused by different gray fabric specifications is effectively avoided, and the one-time loading success rate is increased.

The embodiment of the application discloses a cellulose fiber and a dyeing method thereof. The method comprises the following steps: mixing strong alkali and sodium dithionite in concentrated ammonia water to obtain a reduction solution; adding vat dyes to the reduction solution, reducing for 10-60 minutes under the environment of 30-50 DEG C, and cooling to room temperature to obtain a vat dyeing solution; adding liquid ammonia to the vat dyeing solution to obtain a liquid ammonia vat dyeing solution; and immersing cellulose fiber into the liquid ammonia vat dyeing solution for dyeing, and then carrying out oxidation and soaping in air to obtain dyed cellulose fiber. The vat dyeing solution prepared by using concentrated ammonia water can be easily mixed with liquid ammonia in any proportion, and the liquid ammonia vat dyeing solution containing different water contents can be easily prepared. In addition, the presence of water in the liquid ammonia vat dyeing solution can maintain the reduction state of the vat dyes in the dyeing process, thereby avoiding the problem that the vat dyes are oxidized and the fiber is not dyed through.