116 results about "Acid dye" patented technology

The invention discloses a wool fiber dyeing method based on an electrostatic spraying technology, and belongs to the field of spinning. The method comprises the following steps: firstly, preparing electrostatic dye liquor containing acid dye; then, the wool fabric is subjected to wetting pretreatment with water; fixing the pretreated wool fabric on a collecting device, and uniformly spraying the dye liquor onto the wool fabric through an electrostatic spraying technology; and finally, carrying out color fixation treatment through open-width steaming to obtain the wool fiber material dyed by the acid dye. The dyeing method greatly reduces the use of water resources and dyeing assistants, greatly reduces the generation of printing and dyeing wastewater, is a green and environment-friendly wool fiber dyeing technology, and has huge application potential in the textile printing and dyeing industry.

The invention discloses a multifunctional printing and dyeing dye and application thereof in outdoor clothes, and belongs to the technical field of nylon printing and dyeing, the multifunctional printing and dyeing dye comprises 1-3% (o.w.f) of an acid dye, 1.5-3.5 g / L of a dyeing auxiliary agent, and 0.6-1 g / L of an auxiliary agent cross-linking agent; the dyeing auxiliary agent is a core-crosslinked star-shaped polymer prepared by an arm-first method; dyeing can be changed into color fixation by adjusting the pH value and the bath ratio of the dye bath without additionally preparing a color fixation solution, so that the additional water consumption required by color fixation is reduced; the adopted dyeing auxiliary is a core cross-linked star-shaped polymer prepared by an arm method, and the ultraviolet light absorber is coated in a core, so that the light stability and washability of the ultraviolet light absorber are improved, the mobility is reduced, and the problem of sensitive skin stimulation caused by long-term contact with human skin after the ultraviolet light absorber is migrated to the surface of the fabric is prevented.

The invention relates to a cationic hydrophilic softener for chinlon dyeing in one bath as well as a preparation method and application of the cationic hydrophilic softener. The method comprises the following steps: S1, carrying out hydrosilylation reaction on end hydrogen-containing silicone oil and allyl epoxy polyether under the action of a platinum catalyst; s2, polyol containing hydroxyl and polyisocyanate are subjected to a reaction under the action of a first catalyst, and a-NCO-terminated polyurethane prepolymer is generated; a chain extender containing a tertiary amine group is added into the polyurethane prepolymer for a reaction; adding the epoxy-terminated polyether silicone oil obtained in the step S1 for reaction, and then adding acid for neutralization to obtain cationic polyurethane modified silicone oil; and S3, emulsifying. The softening agent prepared by the invention has excellent stability in a high-temperature acid dye bath, and does not demulsify and stick to a vat; the compatibility with acid dyes is good, and color spots and color spots can be effectively avoided; and after use, the chinlon fabric can be endowed with lasting, smooth and soft hand feeling and good hydrophilicity, and meanwhile, the original whiteness of the fabric is kept.

The invention relates to the field of leveling agents, in particular to a hand feeling type acidic leveling agent and a preparation method thereof. The preparation method comprises the following steps: firstly, amidating long-chain fatty acid of which the carbon atom number is greater than 10 and hydroxyethyl ethylenediamine, and then carrying out ring-opening addition on the amidated long-chain fatty acid and EO under the catalysis of AlMe3-NH4Cl or Me2AlNH2 to prepare a hydrophobic-hydrophilic block copolymer; the obtained leveling agent is high-concentration transparent liquid and is free of gel; the dyeing agent has excellent retarding property, migration property and dye dispersibility in dyeing of acid dyes such as chinlon, wool and the like, and can form a flexible lubricating film on the surface of a fiber, so that the problem that a fabric becomes hard after high-temperature setting is remarkably solved, and a softening agent after-finishing procedure is omitted.

The invention discloses a preparation method of novel acid dye dyeable spandex and spandex. The preparation method comprises the following steps: preparing a hydrophilic polyurethane stock solution and preparing a normal polyurethane stock solution, the preparation method comprises the following steps: mixing a hydrophilic polyurethane stock solution and a normal polyurethane stock solution according to a mass ratio of (50-20%): (50-80%), adding an auxiliary additive, mixing and curing; and carrying out dry spinning on the cured spinning solution to prepare the acid dye dyeable spandex. A group with good hydrophilicity is introduced into hydrophobic spandex, so that a water-soluble dye can enter the spandex more easily in the dyeing process, the hydrophilicity of the spandex is improved, and the dyeability is improved. In the preparation of the spinning solution, hydrophilic polyurethane molecules are introduced, so that the dispersion effect can be improved in the addition and blending process of auxiliary materials, and the small-particle-size powder is not prone to agglomeration.

The invention discloses a non-oxidation type coloring composition and application thereof, and relates to the technical field of daily chemical products. The non-oxidative coloring composition comprises the following components: an acid dye, a rheology modifier, an acid regulator and a hair conditioner. The weight ratio of the acid dye to the rheological modifier to the acid regulator to the hair conditioner is (0.4 to 5) to (1.2 to 3.6) to (1.5 to 4) to (0.2 to 0.45). According to the non-oxidation type coloring composition and the application thereof, the components in the composition cooperate with each other to play a synergistic role, so that pigments can be adsorbed and deposited on the surface of hair, and the non-oxidation type coloring composition has excellent color persistence, color uniformity and anti-staining property, is mild and non-irritating, and also has a certain conditioning and repairing effect on the hair. The non-oxidation type coloring composition provided by the invention can be applied to non-oxidation type hair dyes, including semi-permanent type hair dyes and temporary hair dyes.

The present invention discloses a high-absorption and high-emission thermal control coating on the surface of an aluminum alloy and a preparation method thereof, and relates to the field of surface engineering technology. The method comprises: pre-treatment of the aluminum alloy; placing the pre-treated aluminum alloy as an anode in an oxidation tank, using a sulfuric acid solution as a reaction solution, and adopting a multi-stage reaction method to oxidize the pre-treated aluminum alloy; placing the aluminum alloy in a coloring tank, and coloring it with a black acid dye solution as a coloring liquid; coating the surface of the aluminum alloy with a surface modifier, and obtaining the high-absorption and high-emission thermal control coating on the surface of the aluminum alloy after solidification of the surface modifier. The present invention utilizes anodizing, coloring and sol-gel composite coating technology to prepare a high-absorption and high-emission thermal control coating with low vacuum volatile pollution and good bonding strength on the surface of the aluminum alloy, which solves the problems of vacuum volatiles causing optical component pollution and poor coating bonding strength in the thermal control coating on the surface of the current spacecraft aluminum alloy optical device.

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.

The invention relates to the field of dye chemistry, and discloses an acid dye with high color fastness, a preparation method of the acid dye and application of the acid dye in textile dyeing. According to the dye molecule, a 4-sulfo benzene ring and a 2, 5-dichlorobenzene ring are connected through an azo bridge (-N = N-), and a polysulfonate substituent group (-SO3Na) is introduced to a molecular skeleton to form a symmetric azo conjugated structure. The preparation method comprises the steps of nitration, reduction, sulfonation, diazotization, coupling and the like, the process conditions are mild, and the yield is stable. The obtained dye has a strong absorption peak in the range of 540-560nm, and the molar absorption coefficient epsilon is greater than or equal to 1.0 * 10 < 5 > L.mol <-1 >. Cm <-1 >. Compared with the conventional acid red dye, the dye has the advantages that the light fastness can reach grade 8, the fastness to washing is grade 7 or above, the color is bright, the color layer is uniform, the high dye-uptake can be realized under the low-salt condition, the conductivity of waste liquid is remarkably reduced, and the dye is suitable for dyeing protein fibers such as wool, nylon and silk.

This invention provides an antistatic dyeable spandex fiber and its preparation method. During spandex production, N-(2-hydroxyethyl)ethylenediamine is used as a terminating agent for chain extension, combined with the use of the stabilizer TAD, to prepare antistatic dyeable spandex fiber. This improves the dyeing rate and color fastness of spandex fiber to acid dyes and reactive dyes. Furthermore, the heat-resistant dyeable spandex can meet the high-temperature dyeing requirements in the polyester / spandex field. Simultaneously, the improved antistatic properties of the spandex fiber reduce the amount of oiling agents used by spandex manufacturers, thereby lowering production costs. For subsequent processes, it reduces the defect rate in dyeing, finishing, and weaving, saving costs.

The invention relates to a bio-based anthraquinone acid dye and a preparation method thereof, and belongs to the field of dye chemical industry and textile printing and dyeing. The anthraquinone acid dye containing bio-based amine or bio-based amino acid is simple in preparation method and can be used for dyeing wool fibers. The preparation method specifically comprises the following step: condensing bromamine acid with bio-based amine or bio-based amino acid under the action of a catalyst to obtain the bio-based acid dye. When the acid dye is used for dyeing wool fabrics, relatively high dye-uptake and good leveling property can be obtained, the fastness to washing, the fastness to rubbing, the fastness to light and the like of the fabrics are improved, and each color fastness reaches grade 4 or above. The acid dye disclosed by the invention is simple in preparation method, mild in reaction condition, easily available in raw materials and less in pollution, is a bio-based, green and environment-friendly product, and has dual effects of saving petroleum resources and protecting the environment.

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 invention discloses a preparation method of a dyeing-enhanced high-carboxyl nylon master batch, which comprises the following steps: step 1, adding nylon 6 slices into a main feeding position of an extruder, and adding organic acid into a side feeding position of the extruder; 2, controlling the temperature of each section of temperature zone of the extruder to melt and blend the nylon 6 slices and the organic acid to form a blend; and step 3, carrying out bracing, water tank cooling, grain-sized vibration screening and vacuum constant-temperature drying on the blend to obtain the high-carboxyl nylon 6 master batch. The invention further discloses a preparation method of the high-carboxyl nylon yarn. The high-carboxyl nylon 6 master batch is obtained in a blending granulation mode of the organic acid and the nylon matrix, then the high-carboxyl nylon fiber is prepared, in the dyeing process, the high-carboxyl nylon 6 fiber slowly releases free H < + > in a dye liquor, the acid environment of the dye liquor is enhanced, and therefore the dye uptake of the nylon 6 fiber in acid dye is increased. The high-carboxyl nylon yarn prepared by the invention is beneficial to environmental protection and lower in treatment cost.

The invention relates to the technical field of tobacco processing, in particular to a method for inhibiting oxidative discoloration of a colorant for colored cigarette paper, and aims to solve the problem that when water-soluble azo acid dyes (such as lemon yellow and sunset yellow) coexist with a citrate combustion improver, synergistic degradation is easy to occur under illumination and high-temperature processing conditions to cause discoloration. Sodium hexametaphosphate with the mass being 0.5%-10% of that of dye is introduced into a coloring system to serve as a stabilizer. Sodium hexametaphosphate not only can chelate metal ions in a system, but also can effectively block free radical chain reaction caused by citrate, and reduce direct attack of alkali metal ions on dye chromophores, so that efficient color protection is realized through an ion isolation-free radical quenching dual mechanism. Experiments show that dye conversion can be remarkably inhibited, the inhibition rate can reach 85% or above under the optimal addition amount, and the batch color difference problem of colored cigarette paper is fundamentally solved.

The invention discloses a preparation method of a multicomponent fiber one-bath multicolor normal pressure dyeing braid, and particularly relates to the technical field of braid dyeing, which comprises the following steps: selecting different fibers and weaving a fiber braid; preparing mixed dye liquor; dyeing treatment; and taking out the dyed braid from the dye liquor, and washing and drying the braid. According to the preparation method of the multi-component fiber one-bath multi-color normal-pressure dyeing braid, the cationic dye and the acid dye in the same dye bath dye different fibers in the braid so as to generate different color effects, and in the dyeing process, the dye concentration and the pH value are accurately controlled, so that the color effect of the braid is improved. And it is ensured that each fiber component can obtain ideal color saturation. In addition, a low-temperature normal-pressure dyeing technology is adopted, so that energy consumption and pollution emission are reduced, and meanwhile, the production efficiency is improved. The finally realized braid product is distinct in color gradation and bright and lasting in color, meets the requirements of diversified markets, and has good economic benefits and environmental protection values.

The invention discloses a synthetic method of a water-based polyurethane color fixing agent for nylon dyed by an acid dye, aiming at the property of nylon dyed by the acid dye, poly (butylene adipate-1000) and polyethylene glycol-1000 are mixed to prepare cationic water-based polyurethane, so that the dyeing percentage is increased, and the treated nylon has higher K / S value and color fastness; meanwhile, N, N-dimethyl-N, N-bis (2-ethoxyl) ammonium chloride is selected as a cationic chain extender of the waterborne polyurethane, compared with a traditional cationic chain extender, a neutralization procedure necessary for a traditional route is omitted, the risks of neutralization amount deviation, local acid excess and the like are avoided, and the production process is simplified.

The invention discloses a continuous environment-friendly dyeing method of a chinlon cellulose fiber braid with an antibacterial function, and particularly relates to the technical field of textile, the method comprises the following steps: S1, cleaning the chinlon cellulose fiber braid to remove surface impurities and oil stains; s2, padding a cationic modifier treatment solution, and carrying out cationic modification on the braid; s3, padding an antibacterial agent solution to enable the braid to be loaded with an antibacterial agent; s4, padding with a mixed dye solution of reactive dye and acid dye for dyeing, natural and biological agents are applied, like natural plant saponin is used for pretreating the braid, a biological enzyme soaping agent is used for soaping, a natural grease softening agent is used for after-finishing, natural tea polyphenol extract is used as an antibacterial agent, and the natural components are biodegradable, so that the fabric is environment-friendly and harmless to human bodies. Compared with the prior art, chemical residues can be greatly reduced, irritation of chemical auxiliaries to human skin is avoided in the dyeing fabric wearing process, the allergy risk is reduced, and wearing health is guaranteed.

The invention relates to a new dyeing method developed for dyeing woolen products such as fabrics, fibers, etc. with acid dyestuffs in the presence of metallic mordants (chemical mordants) and bio-mordants in the textile sector.

The invention relates to a PA12 / PA6 parallel composite elastic fiber and a preparation method thereof. Nylon 12 is adopted as a high-shrinkage component, PA6 is adopted as a low-shrinkage component, parallel compounding is achieved, industrial production with high spinning speed and no yarn breakage can be achieved, and real production significance is achieved. Meanwhile, the PA12 / PA6 parallel composite elastic fiber is excellent in elastic property, low in modulus, soft and skin-friendly, has excellent dyeing property in an acid dye system, and provides a new solution for elastic high-end fabric.

The present invention belongs to the technical field of surface treatment, and particularly relates to an electroforming nickel solution containing azo additives for secondary electroformed nickel mesh. By adding azo acid dyes to the electroforming nickel solution, due to the small steric hindrance of the azo additives, they can quickly diffuse into the interior of the mesh holes. The nickel ions in the holes have empty orbitals, which coordinate with the lone pair electrons in the additive molecules to form complexes, inhibiting the reduction of nickel ions in the holes, so that the pore diameter after adding the additives is significantly larger than that of the nickel mesh without adding additives, thereby relatively increasing the opening rate of the nickel mesh by about 4-10%. In addition, the polarization curve results show that compared with the electroforming nickel solution without additives, when using the electroforming nickel solution containing additives, the deposition potential shifts significantly negatively. The electroforming nickel solution of the present invention has the advantages of stable properties, long service life, and simple use process.

The invention provides PEI (polyethyleneimine) functional modification based on magnetic nano silicon oxide and a preparation method and application thereof, and belongs to the field of organic-inorganic composite adsorption materials. The invention provides PEI modification based on magnetic nano silicon oxide. The PEI modification comprises the following raw material components in percentage by mass: magnetic ferroferric oxide, ethyl orthosilicate, APTES (3-aminopropyltriethoxysilane), glutaraldehyde (50%) and PEI. The preparation method comprises the following steps: firstly coating the surface of magnetic ferroferric oxide with nano silicon oxide, then introducing amino of APTES, and finally grafting PEI on the surface of the material by taking glutaraldehyde as a cross-linking agent. The PEI modified magnetic nano silicon oxide material provided by the invention can remarkably improve the adsorption effect on acid dye acid lake blue A, and is convenient to recycle due to magnetism.

The invention discloses a processing method of anti-snagging soft and smooth nylon-spandex four-side elastic trousers, which comprises the following steps: gray fabric processing, including fabric weave design, yarn preparation, yarn screening, twisting and weaving on a machine; the fabric weave design comprises a three-dimensional structure formed by interweaving two or three yarn layers into a whole; the yarns are air-covered nylon / spandex composite yarns, and the twisting coefficient of twisting is 10-20 T / cm; in the step of weaving on a machine, weaving on a machine blank width according to 1.4-1.8 times of the width of a finished product; the dyeing and finishing process comprises the following steps: setting the gray fabric at high temperature; the fabric scouring and bleaching is that the shaped gray fabric is subjected to cold-batch scouring and bleaching; in the dyeing step, the fabric is placed in an acid dye dyeing solution to be dyed, and a color fixing agent is adopted for treatment and color fixation; the step of preshrinking is that the shaped fabric is subjected to wet and hot steaming preshrinking processing; washing ready-made clothes with water; the invention provides a processing method of chinlon spandex four-way stretch trousers. The defects that existing chinlon spandex four-way stretch trousers are prone to snagging and poor in hand feeling are overcome.

The invention provides a wood dyeing method, and belongs to the technical field of wood dyeing. The method comprises the following steps: bleaching wood, pretreating the bleached wood by using an inorganic alkaline solution, placing the pretreated wood in a cation modification solution for cation modification, and placing the cation modified wood in an acid dye dyeing solution for dyeing to obtain the cation modified dyed wood. The inorganic alkaline solution is used for pretreating the bleached wood, under the alkaline condition, hydroxyl groups on the surface of wood fibers are more easily activated, the reaction activity of the wood fibers is improved, cationic groups in the cationic modifier and hydroxyl groups in wood cellulose are more easily subjected to chemical reaction, and therefore more stable covalent bond combination is formed; more cationic modifiers are grafted to wood fibers through a chemical grafting method, more groups with positive charges are introduced to the surface of wood, then the dye uptake is increased, and the cationic modifier is suitable for dyeing processing of wood materials such as recombined decorative veneers and veneer veneers.

The invention relates to the field of textile auxiliaries, in particular to a high-dispersity acidic leveling agent and a preparation method thereof. The leveling agent provided by the invention is prepared by compounding the following raw materials in parts by mass: 2.5-15 parts of an anionic dispersant, 30-60 parts of a thixotropic agent, 35-60 parts of a surfactant and 5-10 parts of water, wherein the thixotropic agent is prepared by amidating long-chain fatty acid with more than 10 carbon atoms with hydroxyethyl ethylenediamine in sequence and then carrying out ring-opening addition with ethylene oxide. The high-dispersion acidic leveling agent provided by the invention is simple in preparation process, can be mixed at normal temperature, is suitable for acid dye dyeing systems such as chinlon and wool, and can improve the dye utilization rate and omit the subsequent softening and finishing process.

The invention relates to a waterborne polyurethane emulsion as well as a preparation method and application thereof. The waterborne polyurethane emulsion is prepared from the following raw materials in parts by weight: 50 to 200 parts of polyether polyol, 100 to 250 parts of polycarbonate polyol, 40 to 100 parts of isocyanate, 1 to 10 parts of nonionic polyol containing a polyoxyethylene group structure, 5 to 20 parts of a chain extender and 400 to 700 parts of an emulsifier. The chain extender comprises a combination of a hydrophilic sulfonic acid chain extender and an aliphatic polyamine derivative chain extender. The preparation raw materials of the water-based polyurethane emulsion are reasonably designed, so that the water-based polyurethane emulsion which can improve the wear-resistant color fastness of acid-dyed base cloth, reduce the fading problem of the acid-dyed base cloth after the acid-dyed base cloth is impregnated and improve the texture of the acid-dyed base cloth, such as velvet feeling, meat feeling and elastic feeling, and has certain water resistance is prepared.

The invention discloses a light-color sunscreen fabric, a preparation method thereof and a sunscreen garment, and belongs to the technical field of textile fabrics. The preparation method comprises the steps that firstly, coated yarn is provided, spandex serves as core yarn of the coated yarn, and extinction chinlon with the special-shaped section serves as outer wrapping fiber of the coated yarn; step 2, knitting the coated yarn according to a double tricot stitch to obtain a gray fabric; the length of each coil of the double tricot stitch is 0.25 to 0.28 cm, and the length of an arc is 0.06 to 0.09 cm; and step 3, carrying out light-color dyeing on the gray fabric by using an acid dye under an acid condition, and then treating the gray fabric by using a phenol anti-yellowing auxiliary agent to obtain the light-color sunscreen fabric including white. According to the light-color sunscreen fabric, the acid dye is selected for dyeing under the acid condition, the phenolic anti-yellowing auxiliary agent is added in the post-finishing process of the fabric, and the yellowing risk is effectively reduced (the color fastness to light yellowing is 4-5 levels).

The invention discloses an antistatic acrylic fiber blended yarn and a preparation method thereof. The antistatic acrylic fiber blended yarn comprises the following components in parts by weight: 100-120 parts of polyacrylonitrile stock solution, 3.5-6 parts of polyethylene glycol, 5-8 parts of conductive mother solution, 0.8-1.5 parts of nano zinc oxide, 25-30 parts of bamboo fiber and 8-15 parts of silver antibacterial polyester. The preparation method comprises the following steps: carrying out ball milling on the modified carbon nanotubes, polyacrylamide and lignosulfonate to prepare conductive mother liquor; blending the polyacrylonitrile stock solution with the conductive mother solution, nano zinc oxide, bamboo fibers and silver fibers, and performing high-speed shearing emulsification and double-screw mixing defoaming to obtain a spinning solution; fibers are formed through low-temperature wet spinning, multi-stage drafting and antistatic silicone oil dipping; optimizing spinning parameters and controlling humidity to weave yarns; finally, acid dye is adopted for dyeing, a finishing solution prepared from a fluorine-containing antistatic agent and a cross-linking agent is used for padding and baking, and the antistatic blended yarn with the electrical conductivity and the dyeing stability is obtained.

The present invention relates to the technical field of fabric processing, and specifically discloses a high color fastness nylon ammonia cationic polyester mountaineering nylon fabric and its processing technology, which specifically includes weaving, desizing and pre-shrinking, embryo setting, desizing in a cylinder, same-bath dyeing and finalizing finishing. Wherein same-bath dyeing: bath ratio 1:10, water inlet, first add nylon sealant, heat to 65-70℃ for treatment, then cool to 40±2℃ and then add leveling agent, non-ionic cationic polyester dyeing auxiliary and cationic dye dissolved in acetic acid in sequence, adjust pH value, then heat to 60-65℃ at a first rate and keep warm for dyeing, then heat to 90±2℃ at a second rate for heat preservation and dyeing, then add non-ionic dispersant WA and anionic diffusant NNO in sequence, add acid dye after heat preservation operation, and heat to 102-105℃ at a third rate for heat preservation and dyeing. The present invention realizes same-bath dyeing of cationic dye and acid dye and improves color fastness and apparent depth.

The invention discloses application of dye waste acid as an inhibitor in phosphorite reverse flotation, which is characterized in that the dye waste acid and sulfuric acid are combined to serve as an inhibitor of apatite to be used in phosphorite reverse flotation, and phosphate concentrate and phosphate tailings are obtained after one-roughing, one-refining and one-scavenging operation. The acid dye wastewater is used as the apatite inhibitor, the utilization rate of the acid dye wastewater can be greatly increased, the wastewater treatment cost is reduced, the environmental harm is reduced, meanwhile, the dosage of a sulfuric acid reagent in the reverse flotation process is reduced, the mineral separation cost is reduced, and the method has the advantages of being wide in application range and high in product index.

The invention discloses acid dyeable melt-spun spandex and a preparation method thereof, and belongs to the technical field of fiber manufacturing. A preparation method of acid dyeable melt-spun spandex comprises the following steps that melt-spun spandex slices are extruded and plasticized through a single screw, a cross-linking agent is added, and the acid dyeable melt-spun spandex is prepared through melt spinning; the melt spinning spandex slices contain carbodiimide groups; the cross-linking agent contains a carbodiimide group and tertiary amine ester. According to the invention, a tertiary amino structure is introduced into the cross-linking agent and then is further introduced into spandex macromolecules, so that a dyeing seat of an acid dye is provided, and the prepared acid dyeable spandex has very good washing color fastness. According to the invention, a high-rigidity carbodiimide structure is introduced into spandex macromolecules, so that the heat resistance of the acid dyeable spandex is improved, elasticity loss is avoided during sizing at 170-180 DEG C, and the requirement of nylon blending sizing is met.