34 results about "Dye uptake" patented technology

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 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 discloses a bisazo blue reactive dye for high-temperature dip dyeing as well as a preparation method and application of the bisazo blue reactive dye. The reactive dye is shown in a structural general formula (I). A color body of the reactive dye is of a bisazo structure, the color body contains two naphthalene ring structures and a benzene ring structure, and an active group in a dye molecular structure is quaternary ammonium salt containing a nicotinic acid structure. According to the present invention, the binding force between the dye and the fiber can be improved through the coplanarity of the chromophore molecules, the dissociation between the dye and the fiber at the high temperature can be reduced, and the dye uptake of the dye at the high temperature can be improved, such that the fixation rate between the dye and the fiber can be improved; meanwhile, quaternary ammonium salt containing a nicotinic acid structure can react with fibers under the high-temperature neutral condition, an alkaline agent does not need to be added in the whole dyeing process, the problem of environmental pollution caused by the alkaline agent in the printing and dyeing wastewater is solved, and wide application prospects are achieved.

This invention relates to the field of textile printing and dyeing, and discloses a high-colorfastness polyamide 56 fabric and its preparation method. The polyamide 56 fabric contains 70-100% polyamide 56 fiber and 0-30% spandex. The fabric has been dyed at least once, and the dye used for dyeing is a reactive dye. The polyamide 56 fabric dyed with reactive dyes of this invention has the advantages of higher dye uptake, wider pH adaptability, no need for large amounts of calcium salts for dyeing, and minimal or no use of color-fixing crosslinking agents.

The invention discloses a chinlon 6 filament based on high carboxyl modification and a preparation method thereof, and belongs to the technical field of chinlon production. The polyamide 6 filament based on high carboxyl modification is prepared by adopting PA6 slices with low-end amino groups and high-end carboxyl groups as raw materials, the ordered combining capacity of fibers and anionic dye is enhanced by reducing the content of the end amino groups and increasing the proportion of the end carboxyl groups, the dye is prevented from being accumulated on the surface, the dyeing uniformity and the dyeing permeability of the polyamide 6 filament are improved, and the dyeing quality of the polyamide 6 filament is improved. Meanwhile, the production parameter combination is precisely regulated and controlled, so that more microporous structures are reserved to adsorb the dye while the high viscosity of the high-carboxyl section is solved in the production process, and dye molecules are more easily diffused into the fiber; the prepared chinlon 6 filament based on high carboxyl modification realizes high-saturation and high-uniformity dyeing under low dye concentration, has ideal dye-uptake and fixation rate, and also has excellent dyeing effect on light-color sensitive colors, not only reduces the washing times after the chinlon filament is dyed, but also does not fade after being washed for multiple times.

This invention belongs to the field of yarn dyeing technology, specifically relating to a method for dyeing warp beams of high-elasticity polyester-cotton yarn. The method includes a warp beam dyeing stage, a polyester dyeing stage, and a cotton dyeing stage. This invention explores and researches the winding and dyeing processes, ultimately breaking away from traditional winding methods and dyeing processes to improve the elasticity damage problem during the dyeing of Macca yarn. The warp beam sandwich provides a buffer space for yarn shrinkage, improving the elasticity of the dyed yarn. Lowering the polyester dyeing temperature, while ensuring dye uptake and colorfastness, improves yarn elasticity. The reduction and cleaning process using sodium hydrosulfite further enhances colorfastness.

The invention provides a dye compound, a preparation method thereof, an alkali-resistant high-water-washing disperse dye and application thereof, and particularly relates to the technical field of dye chemical industry. The dye compound has a structure as shown in a formula I, in the formula I, R1 is selected from substituted or unsubstituted nitrophenyl, 6-nitro-benzothiazolyl, 6, 7-dichlorobenzothiazolyl or 5, 6-dichlorobenzothiazolyl; r1 is selected from methyl or hydrogen atom, R2 is selected from methyl or hydrogen atom, R3 is selected from methyl, ethyl, allyl and cyanomethyl, and R4 is selected from bromine, chlorine, cyano or methyl. According to the dye compound provided by the invention, the azo group and R1 act together, so that the dye compound possibly has rich colors; r1, R2, R3 and R4 substituent groups influence the hydrophilic-hydrophobic property of molecules and the binding capacity with fibers, and the affinity of the dye to the fibers is improved, so that the dye uptake is improved. The interaction between a benzene ring or a benzothiazole ring and a substituent group in the structure endows the dye compound with good color fastness.

The invention relates to the technical field of textile printing and dyeing, and particularly discloses a green reactive dye composition, a reactive dye product and application. The green reactive dye composition comprises a component A, a component B and a component C, wherein the component A is selected from at least one of dye compounds as shown in a formula (I); the component B is selected from at least one of dye compounds as shown in a formula (II); and the component C is selected from at least one of dye compounds as shown in a formula (III). The green reactive dye composition has the advantages of high compatibility, good stability, uniform dyeing, no dyeing defect and high dyeing color fastness, also has the characteristics of high fixation rate, high dye uptake and high dyeing efficiency, can stably dye in low-temperature, low-bath-ratio, low-salt and low-alkali environments, reduces the dyeing cost, and has commercial application prospects and economic values. Formula (I): Formula (II): Formula (III): Formula (I): Formula (II): Formula (III):

A blended fabric having a patterned color includes a first portion composed of cotton and a second portion composed of polyester. A dye having a strong affinity for cotton and a slight affinity for polyester is applied to the fabric. The dye imparts a dark black color to the cotton portion and applies a light gray color to the polyester portion. The combination of dark black cotton and light gray polyester in combination provides the patterned color to the blended fabric. The blended fabric may be composed of a greater percentage of cotton than polyester, the cotton and polyester being spun into monofilament yarns that are then knitted into a plain knit style fabric, a looped knitted terry fabric, or a raised fabric. Furthermore, the present invention includes a blended fabric whereby the cotton rather than the polyester absorbs dyes to create darker and lighter patterns within the blended fabric.

The invention discloses a high-temperature and high-dye-uptake dyeing method suitable for a disperse dye for a polylactic acid textile, and belongs to the technical field of textile. The dyeing method comprises the following steps: placing a disperse dye filter cake in solvent oil to dye a to-be-dyed object, including adsorption, diffusion and washing processes of disperse dye, and comprising the following steps: dyeing the to-be-dyed object in the solvent oil at room temperature by using the disperse dye filter cake, heating to 60-80 DEG C, then heating to 120-140 DEG C, keeping the temperature for 30-60 minutes, and then cooling to 40-50 DEG C; and washing and drying the to-be-dyed object after dyeing. The dyeing method is suitable for high-temperature and high-dye-uptake dyeing of the PLA textile by the disperse dye, the mechanical strength of the PLA textile is not affected at high temperature, the dye-uptake of the disperse dye is improved, and application of the PLA textile in the field of textile and clothing is accelerated.

The application provides a cotton fiber dyeing method of a polar / non-polar binary non-aqueous medium system. The method comprises the following steps: S1, placing cotton fabric, a dye, water, an alkali agent and a polar solvent A in a sealed dyeing tank and filling CO2 for dye dissolution to obtain a mixed system; S2, regulating parameters of the sealed dyeing tank for dyeing; S3, adding a non-polar solvent B to the sealed dyeing tank for fixation treatment; and S4, after cooling to room temperature, taking out the cotton fabric, washing, drying and completing the dyeing. By introducing a CO2 responsive polar solvent, the polarity is enhanced when CO2 is filled, so that high-concentration reactive dyes are fully dissolved at low temperature and almost no hydrolysis occurs, the dosage form is reduced after CO2 is released, the dyes are uniformly precipitated and quickly adsorbed on the cotton fiber, so that the high-concentration dyeing build-up is significantly improved, the dye hydrolysis rate is significantly reduced, the dye uptake is improved to more than 95%, the medium and CO2 can be recycled, and the efficient, green and low waste discharge of cotton fiber deep and thick color dyeing is realized.

The invention relates to the technical field of fiber dyeing, in particular to an isoparaffin medium cationic dye dyeing method for aramid fiber, which comprises the following steps: S1, preparing dye liquor consisting of cationic dye, isoparaffin serving as a dyeing medium and a polar auxiliary serving as a dyeing auxiliary; s2, aramid fibers are added into the dye liquor, and dyeing treatment including heating, heat preservation and cooling is carried out; s3, the dyed aramid fiber is subjected to post-treatment, and the dyed aramid fiber is obtained. According to the method, the technical problems of high energy consumption, heavy pollution, low dye uptake and the like in the existing aramid fiber dyeing are solved, and efficient, level-dyeing and environment-friendly dyeing can be realized under mild conditions.

The invention provides a dyeing and sizing assembly and a dyeing and sizing combination machine, and relates to the technical field of textile equipment. The dye slurry assembly comprises a dye vat and a plurality of dye uptake rollers, the dye uptake rollers are arranged in the dye vat, and at least parts of the dye uptake rollers are sequentially arranged in the length direction of the dye vat; wherein the object to be dyed is alternately and sequentially wound around the dyeing rollers in an S-shaped mode. On the premise that the dyeing quality is guaranteed, the mutual restriction relation between the existing adsorption rate and the vehicle speed can be broken through, and the uniformity of the dye liquor is effectively improved.

The invention discloses a cashmere low-temperature dyeing process based on enzyme treatment. The process comprises cashmere fiber pretreatment, first enzyme treatment, second enzyme treatment, low-temperature dyeing and post-treatment. Putting the cashmere fibers into a compound enzyme treatment solution for treatment; the compound enzyme treatment liquid contains keratinase, ligninase, pectinase, laccase, a penetrant and water; the cashmere is subjected to mild treatment by compounding a plurality of proteases, and a scale layer is effectively modified on the premise of not damaging a fiber main body, so that high-quality dyeing under medium and low temperature conditions is realized, the dyeing temperature is reduced from 100 DEG C to 60-75 DEG C, and the energy consumption is reduced. The enzyme pretreatment provides more channels and dyeing seats for the dye, the dye uptake is obviously improved, and the color fastness reaches grade 4 or above. The use of strong acid and a large amount of inorganic salt is avoided, the COD (Chemical Oxygen Demand) and salt content in the wastewater are reduced, and the sewage treatment pressure is reduced. And the biological enzyme is biodegradable, so that the environmental load is small.

This invention relates to the field of textile printing and dyeing technology, and discloses a method for preparing high-color-fastness, low-temperature, energy-saving dyed elastic fabric. The method includes: feeding a polyester / polyurethane interwoven elastic fabric into a dyeing machine; adding water to adjust to a first temperature; adding anhydrous sodium sulfate, sodium diisobutyl sulfosuccinate, and fatty alcohol polyoxyethylene ether in a circulating cycle; raising the temperature to a second temperature and adding propylene carbonate; subsequently adding gluconate-δ-lactone and Disperse Red 60, and circulating at a constant temperature; then raising the temperature to the highest dyeing temperature and holding; lowering the temperature to a third temperature and draining the dye liquor; refilling with water and adding fatty alcohol polyoxyethylene ether for hot water washing; and finally, rinsing with cold water and setting. This invention utilizes the low-temperature swelling effect of propylene carbonate and the slow-release acid-producing mechanism of gluconate-δ-lactone to control the highest dyeing temperature at 92–98°C, avoiding heat damage and elasticity loss of polyurethane fibers, improving dye uptake and fabric color fastness, while reducing dyeing energy consumption.

The application discloses a transfer film using cationic digital ink, which comprises a carrier, an ink receiving layer and a protective layer from bottom to top, wherein the thickness of the ink receiving layer is 1-5 mu m, and the thickness of the protective layer is 1-3 mu m. The polyvinyl alcohol with an average molecular weight of 130-160 thousand Da and the polyurethane resin dispersion are used together to improve the color luster of the film after transfer, increase the dye uptake rate, and realize the transfer of deep color patterns. The color of the pattern after transfer is bright, the ink can be prevented from penetrating after printing on the fabric, the ink is saved, the fixing effect of the cationic dye on the textile can be realized at a relatively low temperature, and the purpose of saving energy is achieved.

The present invention relates to the technical fields of fluorescent dye synthesis, fluorescence imaging, and bio-sensing. Disclosed are an amide cyanine dye, an efficient synthesis method therefor, and a use thereof in fluorescence imaging. Compared with traditional cyanine dye synthesis methods, the amide cyanine dye synthesis method of the present invention is simple and has few by-products, short reaction time, high yield, a stable structure, and high universal applicability. By increasing the length of a conjugated chain, the absorption and emission wavelengths of the amide cyanine dye can be expanded from a short-wave near-infrared region to a near-infrared-II band. Experiments have proven that the amide cyanine dye has good photophysical properties and the potential for biofluorescence imaging, and can be used in biometric imaging, super-resolution fluorescence imaging of cellular mitochondria, protein labeling, specific recognition of antibodies, nucleic acid labeling, DNA sequencing, tumor photodynamic therapy, etc. On the basis of the advantages, the amide cyanine dye of the present invention has good prospects for application in the field of biofluorescence imaging research.

A method of dyeing a textile, the method including depositing a metal-organic framework (MOF) on at least one surface of the textile thereby forming a MOF functionalized textile; contacting the MOF functionalized textile with a dye thereby forming a dyed textile; and optionally drying the dyed textile. Metal-organic framework functionalized textiles can be dyed with natural dyes effectively with higher dye uptake and colorfastness without the use of traditional mordants.

The present invention relates to the technical field of chemical textile processing. Disclosed is a dyeing process for a polylactic acid / nanocellulose composite fiber, comprising a spinning solution preparation step, a spinning step and a dyeing step, wherein the spinning solution preparation step comprises uniformly mixing a nanocellulose suspension, a polylactic acid solution and an additive together, standing at 30-80°C for 1-2 h, performing high-energy electron beam radiation to form a gel, and washing the gel with water to obtain a hydrogel spinning solution; the spinning step comprises feeding the hydrogel spinning solution into a wet spinning device for spinning to form a fiber, and subjecting the fiber to high-energy electron beam radiation for drying and reinforcement to obtain a fiber filament, wherein the irradiation dose is 10-50 kGy, and the irradiation time is 3-5 minutes. The preparation method in the present invention is simple and easy to implement, and is environmentally friendly; the dye uptake rate of the prepared composite fiber reaches 80%, the strength of the composite fiber is enhanced by 1-2 times, and the anti-fibrillation property is improved by 1-2 times.

The present application relates to the technical field of textile printing and dyeing, and discloses a hot melt dyeing method of high-dye-uptake nano liquid dye, which comprises the following steps: S1, dip-dyeing and dip-padding of polyester fabric in a dyeing solution, wherein the dyeing solution comprises modified nano liquid dye, thickening agent, defoaming agent and water; the modified nano liquid dye is modified polyaniline layer-coated nano liquid dye; S2, drying and baking treatment of the dip-padded polyester fabric; S3, finally, post-finishing is performed to obtain a polyester dyed product. The present application selects nano liquid dye, which has low impurity content and high dyeing rate, and the color light can reach the standard without washing. The excellent dyeing uniformity and dyeing color fastness of the modified polyaniline layer-coated nano liquid dye are relied on, and the hot melt dyeing process is adopted, and the appropriate post-finishing process is selected, so that the traditional dyeing effect is achieved, and the purpose of energy saving and emission reduction is finally realized.

This invention belongs to the field of natural plant dyeing technology for textiles, and discloses a method for natural dyeing and composite tie-dyeing color fixing of textiles based on Ningxia red goji berry pulp. This method uses cold-pressed pulp from fresh Ningxia red goji berries as the core dye. The dyeing process involves core steps including goji berry pulp extraction, fabric modification pretreatment, goji berry pulp dye liquor preparation, constant temperature dyeing, composite mordant color fixing, and color-locking and setting. Fabric pre-modification is achieved through a compound of alum and chitosan, combined with a formaldehyde-free cationic fixing agent to construct a composite mordant system. Low-temperature dyeing and baking setting processes are then used to create a three-dimensional cross-linked structure of dye, fiber, and mordant. This method is entirely free of harmful chemical reagents, improving dye uptake and color fastness. The finished product has a rich color and is suitable for various textiles such as cotton, linen, silk, and wool. The color fastness to washing and rubbing reaches level 4 or higher, and the color fastness to sunlight reaches level 3 or higher.

This invention discloses a high-strength, protective low-temperature dyeing method for wool based on guanidine salt removal of wool lipids, belonging to the application technology field of wool dyeing and finishing in the wool textile industry. Addressing the problems of significant fiber structure damage and strength reduction in existing high-temperature wool dyeing processes, and the limitations of existing low-temperature dyeing technologies in industrial application and poor dark-color dyeing effects, this invention employs a PHMB / SPHMB, sodium carbonate, and sodium sulfate composite system to degrease wool, followed by washing and low-temperature dyeing with wool reactive dyes. This invention can achieve low-temperature dyeing of wool at 70-75℃, with a maximum dye uptake of 99.12%, and the dyeing effect is superior to conventional boiling dyeing processes. The treated wool fibers retain their strength without loss and even show a slight increase, while also imparting excellent antibacterial properties. The process is short, energy-efficient, environmentally friendly, and suitable for industrial production needs.

The invention relates to a printing and dyeing auxiliary agent and a dyeing method thereof. The printing and dyeing auxiliary agent is prepared from the following raw materials in parts by weight: 96 to 98 parts of anhydrous sodium sulphate, 1.2 to 1.8 parts of multifunctional dispersing agent DM-1501, 0.8 to 1.2 parts of 8-hydroxy-2-methylquinolyl Gemini surfactant and 0.3 to 0.7 part of alkyl glycoside. The preparation raw materials of the 8-hydroxy-2-methyl quinolyl Gemini surface active agent comprise 8-hydroxy-2-methyl quinoline and sulfonic acid ester. The printing and dyeing auxiliary agent can improve the dyeing uniformity and color fastness of cotton cakes. The K / S value of the dyed cotton cake is gt; 26.5, the dye uptake rate gt; the color fastness to wet rubbing is gt; grade 3, the color fastness to washing is gt; and grade 4.

This invention belongs to the field of eco-friendly dyeing and printing technology, and discloses a cationic dye reverse micelle emulsion and its application in acrylic yarn dyeing. The cationic dye reverse micelle emulsion comprises a cationic dye solution and fatty acids, wherein the fatty acids are at least one of C16-C18 fatty acids or fatty acids obtained from the hydrolysis of (waste) edible oils. When this cationic dye reverse micelle emulsion is used for dyeing acrylic yarn, no additional acid-base buffer system or synthetic retarder is required. Dyeing is completed under normal pressure, significantly reducing dyeing water and colored wastewater discharge. It also effectively improves the dye uptake rate and color depth of the finished product in the dyeing of dark acrylic yarn, reduces the bulkiness of the finished acrylic yarn, and increases the strength of the acrylic yarn.

The invention relates to the technical field of dye printing and dyeing detection, and particularly discloses a method for detecting the dye uptake of a blue dyed yarn. According to the method, excessive potassium permanganate is used for reacting with the ornamental blue on the yarn, then sodium oxalate is used for titrating the content of the residual potassium permanganate, the content of consumed potassium permanganate (namely the content of the ornamental blue) is calculated, and finally the dye uptake of the yarn dyed by the ornamental blue is obtained. Compared with yarns dyed by using organic solvent to strip and color-observing blue, the yarns reacted by potassium permanganate are whiter in color, so that the color-observing blue on the yarns can be completely stripped by adopting the method disclosed by the invention, the finally calculated dye-uptake is close to the set value, and the result is more accurate.

The invention discloses an amide cyanine dye as well as an efficient synthesis method and fluorescence imaging application thereof, and belongs to the technical fields of fluorescent dye synthesis, fluorescence imaging and biosensing. Compared with a traditional cyanine dye synthesis method, the amide cyanine dye synthesis method is simple, few in by-products, short in reaction time, high in yield, stable in structure and high in universality, the absorption and emission wavelength of the amide cyanine dye can be expanded from a short-wave near-infrared region to a near-infrared second-region wave band by increasing the length of a conjugated chain, and the absorption and emission wavelength of the amide cyanine dye can be expanded from a short-wave near-infrared region to a near-infrared second-region wave band. Experiments prove that the amide cyanine dye has good photophysical properties and biological fluorescence imaging potential, and can be applied to the aspects of biological recognition imaging, super-resolution fluorescence imaging of cellular mitochondria, protein labeling, specific recognition of antibodies, nucleic acid labeling, DNA sequencing, tumor photodynamic therapy and the like. Based on the advantages, the amide cyanine dye disclosed by the invention has a good application prospect in the field of biological fluorescence imaging research.

This invention relates to the field of cationic modifiers and discloses a cationic modifier for cellulose fibers and its preparation method, comprising the following steps: mixing methacryloyloxyethyltrimethylammonium chloride, acrylamide, glycidyl methacrylate, a modifier, an initiator, and deionized water, stirring until homogeneous, to obtain a mixture; stirring the mixture to react, cooling to room temperature, adding ethanol, collecting the white precipitate by vacuum filtration, washing and drying the white precipitate to obtain the cationic modifier for cellulose fibers. The cationic modifier for cellulose fibers formed by methacryloyloxyethyltrimethylammonium chloride, acrylamide, glycidyl methacrylate, and the modifier can penetrate into the fiber interior, resulting in a uniform distribution of cationic groups on the fiber surface, thereby improving the dye uptake and fixation rate of subsequent dyes.

The invention discloses a zwitterionic lignin dispersant which is mainly composed of lignosulfonic acid quaternary ammonium salt. Accordingly, a corresponding preparation method is also established, the lignin is dissolved in an organic solvent, a basic catalyst is added for a hydrogen extraction reaction, then a sulfonating reagent is added for a nucleophilic reaction, and the lignin is obtained. Researches show that the molecular weight of the lignin is protected by the preparation method, the molecular weight is 4673, the sulfonation degree is moderate, and the hydrophilicity and the stability of quaternary ammonium cations are also improved. The lignin dispersant is excellent in particle size dispersion, high-temperature stability, dye absorption performance, low reducibility and dyeing diffusion performance, has a wide application prospect and can be widely applied to the fields of dyes, textiles and the like. In addition, the preparation method is simple, efficient and friendly to reactants, the organic solvent is recovered through evaporation and condensation, the preparation method is very suitable for industrial production, and the cost is easy to control.

The invention relates to the technical field of dyeing, in particular to a pre-color-fixing device for colored spun fiber strips, a dyeing system and a using method. A front color fixing device for a color spinning fiber rod comprises a drying and color fixing box, a color fixing device and a color fixing device, the steam generation assembly is arranged in the containing space and comprises a water tank and a supporting plate, saturated steam is generated in the water tank, the supporting plate is connected with the water tank, a fiber net is placed on the supporting plate, a plurality of vent holes are formed in the supporting plate, and dye to be fixed is attached to the fiber net. The invention provides a pre-color-fixing device, a dyeing system and a use method of a color-spun fiber rod, aiming at solving the problems of low dye utilization rate, light color of prepared textiles and low color fastness caused by the fact that dye liquor is attached to the surfaces of fibers and is insufficiently reacted with the fibers after being dried by a follow-up prolonged fiber net, realizing high dye uptake and high color-fixing rate, and improving the quality of the textiles. Meanwhile, the technological process is shortened, and consumption of water and chemical auxiliaries is reduced.

The invention discloses a modified polyester fiber and a preparation method thereof. The modified polyester fiber is prepared from the following raw materials in parts by weight: 100 parts of dimethyl terephthalate, 200 to 240 parts of ethylene glycol, 2.0 to 6.0 parts of dimethyl isophthalate-5-sodium sulfonate, 6 to 15 parts of a catalyst, 0.02 to 0.04 part of a stabilizer, 3 to 5 parts of a delustering agent, 5 to 10 parts of an interface compatilizer and 10 to 15 parts of a hydrophilic modifier. The method has the advantages that the dyeing performance of the polyester fiber is remarkably improved, and low-temperature dyeing, high dye uptake and excellent color fastness are realized.