CN112376300A - Post-dyeing method of polypropylene fabric - Google Patents
Post-dyeing method of polypropylene fabric Download PDFInfo
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- CN112376300A CN112376300A CN202011167238.5A CN202011167238A CN112376300A CN 112376300 A CN112376300 A CN 112376300A CN 202011167238 A CN202011167238 A CN 202011167238A CN 112376300 A CN112376300 A CN 112376300A
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P3/00—Special processes of dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form, classified according to the material treated
- D06P3/79—Polyolefins
- D06P3/793—Polyolefins using vat or sulfur dyes
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/22—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using vat dyestuffs including indigo
- D06P1/221—Reducing systems; Reducing catalysts
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/64—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders using compositions containing low-molecular-weight organic compounds without sulfate or sulfonate groups
- D06P1/642—Compounds containing nitrogen
- D06P1/649—Compounds containing carbonamide, thiocarbonamide or guanyl groups
- D06P1/6495—Compounds containing carbonamide -RCON= (R=H or hydrocarbons)
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P1/00—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed
- D06P1/44—General processes of dyeing or printing textiles, or general processes of dyeing leather, furs, or solid macromolecular substances in any form, classified according to the dyes, pigments, or auxiliary substances employed using insoluble pigments or auxiliary substances, e.g. binders
- D06P1/673—Inorganic compounds
- D06P1/67333—Salts or hydroxides
- D06P1/67341—Salts or hydroxides of elements different from the alkaline or alkaline-earth metals or with anions containing those elements
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Abstract
The invention provides a post-dyeing method of polypropylene fabrics, belonging to the technical field of textile printing and dyeing. Firstly, adding sodium hydroxide and thiourea dioxide into a vat dye solution to prepare a vat dye leuco solution; then adding rare earth compound and methyl formanilide in turn, stirring to form a methyl formanilide-rare earth-vat dye connector complex; then, soaking the polypropylene fabric into a dye solution for dyeing; and finally, carrying out oxidation and soap boiling treatment, washing with water and drying to obtain the dyed polypropylene fabric. According to the invention, the rare earth compound and the methylformanilide are added into the leuco solution of the vat dye to form a methylformanilide-rare earth-vat dye connector complex, and the methylformanilide has a swelling effect on the polypropylene fiber under the action of heat, so that the vat dye enters the fiber along with the connector complex, thereby remarkably improving the dyeing efficiency and the light fastness.
Description
Technical Field
The invention belongs to the technical field of textile printing and dyeing, and relates to a post-dyeing method of polypropylene fabrics.
Background
The polypropylene fiber, polypropylene for short, is one of the main synthetic fiber varieties, and has the advantages of low cost, excellent performance, wide application and rapid development. However, the dyeing of polypropylene fiber is still a difficult problem in dyeing and finishing, and the fiber macromolecules do not have any dyeing functional group capable of combining with dyes or pigments, and have high crystallinity, few amorphous regions, compact structure, strong hydrophobicity and lack of dyeing seats, so that the acting force between various dyes and the fiber is weak, so that the dye molecules can only diffuse or permeate into the amorphous regions of the fiber molecules and can not enter into the crystalline regions, thereby resulting in poor dyeing performance of the polypropylene fiber. Although colored products can be obtained by a color master batch stock solution coloring method at present and are widely applied to industrial textiles, the application of polypropylene fibers is limited by the difficult dyeing and the difficult deep color dyeing, so people still apply various methods to explore the dyeing processing of polypropylene fabrics.
At present, the polypropylene fiber dyeing method comprises the steps of coloring of colored master batch stock solution, blending modification, copolymerization modification, surface grafting modification, chemical modification and the like. Although the methods solve the problem of difficult polypropylene fiber dyeing to a certain extent, satisfactory dyeing effect is still not achieved, and the chemical modification dyeing method influences the performance of the polypropylene fiber to a certain extent. Therefore, the deep research on the dyeing method of the polypropylene fiber has great significance for widening the application field of the polypropylene fiber.
In the document of the Chinese publication, printing and dyeing, published date 1999, entitled "discussion of dyeing unmodified polypropylene fiber fabric by leuco acid as a vat dye", the leuco acid dyeing method is adopted to dye the unmodified polypropylene fiber fabric, and researches show that the leuco acid as the vat dye can dye the unmodified polypropylene fiber fabric, and the dye reaches the highest peak when the pH value is near neutral. But has the disadvantage of low dyeing K/S value of the dyed polypropylene fabric.
The vat dye is a dye which is insoluble in water, needs to be reduced and dissolved in alkaline solution by a reducing agent to generate leuco sodium salt of the dye for dyeing, has the excellent performances of bright color, complete chromatogram, good dyeing color fastness and the like, has particularly outstanding color fastness to sunlight and washing, and is one of high-grade dyes for cotton. Three dyeing methods are commonly used for vat dyes, namely leuco dye method, suspension dye method and leuco acid dye method. The leuco dyeing method is that the dye is reduced into leuco body with caustic soda and sodium hydrosulfite or thiourea dioxide, the leuco body of the vat dye is dissolved in water, and the leuco body of the vat dye is oxidized by air or an oxidant after dyeing to form insoluble vat dye again and is fixed on fiber products.
In the document of Chinese publication rare earth, published by 2015, entitled "preparation of rare earth lanthanum oxide hybrid modified polypropylene fiber and discussion of performance thereof", rare earth lanthanum oxide hybrid modified polypropylene fiber is prepared by a blending method, and then dyed by disperse dye, so that dyeing depth and color purity are improved.
Therefore, it is necessary to find a dyeing method of vat dyes suitable for polypropylene fiber fabrics to improve the dyeing efficiency and color fastness of the vat dyes on the polypropylene fiber fabrics.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a post-dyeing method of polypropylene fabrics, which comprises the steps of adding rare earth compounds and methyl formanilide into a vat dye leuco solution to form a methyl formanilide-rare earth-vat dye connector complex, and utilizing the swelling effect of the methyl formanilide on polypropylene fibers under the action of heat to ensure that the vat dye enters the fibers along with the connector complex, thereby obviously improving the dyeing efficiency and the light fastness.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a post-dyeing method of polypropylene fabrics comprises the following steps:
s1, preparing vat dye liquor: adding vat dye with the concentration of 5-9 g/L into distilled water, uniformly stirring, then adding sodium hydroxide with the concentration of 5-9 g/L and thiourea dioxide with the concentration of 5-9 g/L, heating to 30-60 ℃, stirring for reaction to obtain a vat dye leuco body, and stopping heating; then adding 0.2-0.5% owf of rare earth compound based on the weight of the fabric, and stirring to complex the rare earth compound to form a vat dye-rare earth compound connector complex; finally, adding 30-60 g/L of methyl formanilide, and stirring to form a connector complex of the methyl formanilide-rare earth-vat dye, thus obtaining vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fabric into the vat dye solution obtained in the step S1 according to a bath ratio of 1: 20-1: 40, heating to 115-140 ℃ at a heating rate of 1 ℃/min, and keeping the temperature for 40-80 min to dye the polypropylene fabric; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: reducing and oxidizing the dyed polypropylene fabric in the step S2, and then washing with water;
s4, post-processing: and (4) soaping the polypropylene fabric subjected to the oxidation treatment in the step (S3), and then cleaning and drying to obtain the dyed polypropylene fabric.
Preferably, in step S1, the rare earth compound includes, but is not limited to, one or more of rare earth chlorides.
Preferably, the rare earth chloride is cerium chloride or lanthanum chloride.
Preferably, in step S1, the vat dye includes, but is not limited to, one or more of insoluble vat dyes.
Preferably, in step S3, the reduction and oxidation treatment step includes: and (4) placing the dyed polypropylene fiber fabric in the step (S2) in a solution with a bath ratio of 1: 25-1: 40, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 10-30 min, taking out, placing into a hydrogen peroxide solution with a bath ratio of 1: 25-1: 40 and a concentration of 1g/L, carrying out oxidation treatment at 30-60 ℃ for 10-60 min, and then washing with water.
Advantageous effects
Compared with the prior art, the post-dyeing method of the polypropylene fabric provided by the invention has the following beneficial effects:
(1) the invention provides a post-dyeing method of polypropylene fabrics, which comprises the steps of firstly adding sodium hydroxide and thiourea dioxide into a vat dye solution, heating the vat dye solution to ensure that the thiourea dioxide generates urea and sulfinic acid with strong reducibility under the heating and alkaline environment, and reducing the vat dye into leuco sodium salt by the sulfinic acid, thereby obtaining vat dye leuco solution. And adding a rare earth compound into the leuco body solution of the vat dye, wherein the rare earth compound is used as a central ion to form a coordination bond with negatively charged vat dye anions serving as ligands through electrostatic attraction and an organic ligand to form a stable complex due to the complexation effect of the rare earth ions. The complex shows partial covalent characteristics and plays a role of multiple coordination, because the methyl formanilide contains an amino functional group, the methyl formanilide is connected with rare earth ions in a coordination complexing mode, and simultaneously the vat dye is complexed with the rare earth, so that a connector complex in the form of the methyl formanilide-rare earth-vat dye is formed, and the vat dye liquor is obtained. The dye solution has the advantages of simple preparation method, high dyeing efficiency and little pollution.
(2) The invention provides a post-dyeing method of polypropylene fabrics, which adopts dye liquor rich in methylformanilide-rare earth-vat dye connector complex to dye polypropylene fibers at high temperature, when the prepared dye liquor contacts the polypropylene fibers, because the fibers are hydrophobic fibers and the methylformanilide is a water-insoluble oily substance and also has strong hydrophobicity, the polypropylene fibers can be swelled due to the principle of similar intermiscibility. The rare earth complexes the methyl formanilide, and complexes a plurality of methyl formanilide molecules by taking rare earth ions as the center, the methyl formanilide is easy to be adsorbed on the polypropylene fiber due to the characteristics of the methyl formanilide, and the complexes are adsorbed on the fiber through the methyl formanilide. A plurality of methyl formanilide molecules taking rare earth ions as center complex form high-concentration methyl formanilide on the surface layer of the fiber, and under the action of heat, the gaps among macromolecules are increased for polypropylene fiber macromolecules, so that the complex is guided into the polypropylene fiber, and the dyeing efficiency is remarkably improved.
Detailed Description
The technical solutions of the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
The invention provides a post-dyeing method of polypropylene fabrics, which comprises the following steps:
s1, preparing vat dye liquor: adding vat dye with the concentration of 5-9 g/L into distilled water, uniformly stirring, then adding sodium hydroxide with the concentration of 5-9 g/L and thiourea dioxide with the concentration of 5-9 g/L, heating to 30-60 ℃, stirring for reaction to obtain a vat dye leuco body, and stopping heating; then adding 0.2-0.5% owf of rare earth compound based on the weight of the fabric, and stirring to complex the rare earth compound to form a vat dye-rare earth compound connector complex; finally, adding 30-60 g/L of methyl formanilide, and stirring to form a connector complex of the methyl formanilide-rare earth-vat dye, thus obtaining vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fabric into the vat dye solution obtained in the step S1 according to a bath ratio of 1: 20-1: 40, heating to 115-140 ℃ at a heating rate of 1 ℃/min, and keeping the temperature for 40-80 min to dye the polypropylene fabric; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: reducing and oxidizing the dyed polypropylene fabric in the step S2, and then washing with water;
s4, post-processing: and (4) soaping the polypropylene fabric subjected to the oxidation treatment in the step (S3), and then cleaning and drying to obtain the dyed polypropylene fabric.
Preferably, in step S1, the rare earth compound includes, but is not limited to, one or more of rare earth chlorides.
Preferably, the rare earth chloride is cerium chloride or lanthanum chloride.
Preferably, in step S1, the vat dye includes, but is not limited to, one or more of insoluble vat dyes, such as indigo vat dyes, fused ring ketone vat dyes, or anthraquinone vat dyes.
Preferably, in step S3, the reduction and oxidation treatment step includes: and (4) placing the dyed polypropylene fiber fabric in the step (S2) in a solution with a bath ratio of 1: 25-1: 40, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 10-30 min, taking out, placing into a hydrogen peroxide solution with a bath ratio of 1: 25-1: 40 and a concentration of 1g/L, carrying out oxidation treatment at 30-60 ℃ for 10-60 min, and then washing with water.
The method for post-dyeing polypropylene fiber fabric provided by the invention is further described in detail by specific examples and comparative examples.
In the invention, a colori7 colorimeter is adopted to test the K/S value; the color fastness to sunlight is tested according to the standard GB/T8427 and 2008, color fastness to artificial light, xenon arc.
Example 1
A post-dyeing method of polypropylene fabrics comprises the following steps:
s1, preparing vat dye liquor: adding insoluble vat blue BC with the concentration of 9g/L into distilled water, stirring for 3 minutes at 200 revolutions/min, then adding sodium hydroxide with the concentration of 9g/L and thiourea dioxide with the concentration of 8g/L, heating to 90 ℃, stirring for 15 minutes at 200 revolutions/min, and stopping heating to obtain vat dye leuco; then adding 0.5% owf lanthanum chloride of the weight of the fabric, and stirring for 5min to obtain a connector complex of the vat dye-rare earth compound; finally, adding 50g/L of methyl formanilide, and stirring for 3min to obtain vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fiber fabric into the vat dye solution obtained in the step S1 according to a bath ratio of 1:40, wherein the dyeing starting temperature is 40 ℃, the temperature is raised to 140 ℃ at a heating rate of 1 ℃/min, and the temperature is kept for 80 min; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: placing the dyed polypropylene fiber fabric in a solution with a bath ratio of 1:40, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 30min, taking out, then placing the dyed polypropylene fiber fabric in a hydrogen peroxide solution with a bath ratio of 1:40 and a concentration of 1g/L, oxidizing at 60 ℃ for 60min, and washing with water;
s4, post-processing: and (3) placing the oxidized polypropylene fabric in a solution with a bath ratio of 1:30, a soap powder concentration of 5g/L and a sodium carbonate concentration of 3g/L, soaping for 10min at 100 ℃, washing with running water, and drying to obtain the dyed polypropylene fabric.
Example 2
A post-dyeing method of polypropylene fabrics comprises the following steps:
s1, preparing vat dye liquor: adding insoluble vat blue BC with the concentration of 5g/L into distilled water, stirring for 3 minutes at 200 revolutions/min, then adding sodium hydroxide with the concentration of 5g/L and thiourea dioxide with the concentration of 4g/L, heating to 30 ℃, stirring for 5 minutes at 200 revolutions/min, and stopping heating to obtain vat dye leuco; then adding 0.2% owf lanthanum chloride of the weight of the fabric, and stirring for 5min to obtain a connector complex of the vat dye-rare earth compound; finally adding 30g/L of methyl formanilide, and stirring for 3min to obtain vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fiber fabric into the vat dye solution obtained in the step S1 at a bath ratio of 1:20, wherein the dyeing starting temperature is 40 ℃, the temperature is increased to 115 ℃ at a heating rate of 1 ℃/min, and the temperature is kept for 40 min; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: placing the dyed polypropylene fiber fabric in a solution with a bath ratio of 1:25, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 10min, taking out, placing into a hydrogen peroxide solution with a bath ratio of 1:25 and a concentration of 1g/L, oxidizing at 30 ℃ for 10min, and washing with water;
s4, post-processing: and (3) placing the oxidized polypropylene fabric in a solution with a bath ratio of 1:30, a soap powder concentration of 5g/L and a sodium carbonate concentration of 3g/L, soaping for 10min at 100 ℃, washing with running water, and drying to obtain the dyed polypropylene fabric.
Example 3
A post-dyeing method of polypropylene fabrics comprises the following steps:
s1, preparing vat dye liquor: adding insoluble vat blue BC with the concentration of 6g/L into distilled water, stirring for 3 minutes at 200 revolutions/min, then adding sodium hydroxide with the concentration of 6g/L and thiourea dioxide with the concentration of 6g/L, heating to 45 ℃, stirring for 10 minutes at 200 revolutions/min, and stopping heating to obtain vat dye leuco; then adding 0.3% owf lanthanum chloride of the weight of the fabric, and stirring for 5min to obtain a connector complex of the vat dye-rare earth compound; finally, adding the methyl formanilide with the concentration of 45g/L, and stirring for 3min to obtain vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fiber fabric into the vat dye solution obtained in the step S1 at a bath ratio of 1:30, wherein the dyeing starting temperature is 40 ℃, the temperature is raised to 130 ℃ at a heating rate of 1 ℃/min, and the temperature is kept for 60 min; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: placing the dyed polypropylene fiber fabric in a solution with a bath ratio of 1:30, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 20min, taking out, placing into a hydrogen peroxide solution with a bath ratio of 1:30 and a concentration of 1g/L, oxidizing at 45 ℃ for 30min, and washing with water;
s4, post-processing: and (3) placing the oxidized polypropylene fabric in a solution with a bath ratio of 1:30, a soap powder concentration of 5g/L and a sodium carbonate concentration of 3g/L, soaping for 10min at 100 ℃, washing with running water, and drying to obtain the dyed polypropylene fabric.
Example 4
A post-dyeing method of polypropylene fabrics comprises the following steps:
s1, preparing vat dye liquor: adding 3g/L of insoluble vat blue BC and 3g/L of insoluble vat yellow 3RT into distilled water, stirring for 3 minutes at 200 revolutions/min, then adding 6g/L of sodium hydroxide and 6g/L of thiourea dioxide, heating to 45 ℃, stirring for 10 minutes at 200 revolutions/min, and stopping heating to obtain vat dye leuco; then adding 0.3% owf lanthanum chloride of the weight of the fabric, and stirring for 5min to obtain a connector complex of the vat dye-rare earth compound; finally, adding the methyl formanilide with the concentration of 45g/L, and stirring for 3min to obtain vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fiber fabric into the vat dye solution obtained in the step S1 at a bath ratio of 1:30, wherein the dyeing starting temperature is 40 ℃, the temperature is raised to 130 ℃ at a heating rate of 1 ℃/min, and the temperature is kept for 60 min; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: placing the dyed polypropylene fiber fabric in a solution with a bath ratio of 1:30, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 20min, taking out, placing into a hydrogen peroxide solution with a bath ratio of 1:30 and a concentration of 1g/L, oxidizing at 45 ℃ for 30min, and washing with water;
s4, post-processing: and (3) placing the oxidized polypropylene fabric in a solution with a bath ratio of 1:30, a soap powder concentration of 5g/L and a sodium carbonate concentration of 3g/L, soaping for 10min at 100 ℃, washing with running water, and drying to obtain the dyed polypropylene fabric.
Example 5
Example 5 provides a method for post-dyeing a polypropylene fiber fabric, which is different from example 3 in that the rare earth compound in step S1 is cerium chloride, and the rest is substantially the same as example 3, and thus, the description thereof is omitted.
Comparative example 1
The polypropylene fabric is dyed by adopting a traditional vat dye dyeing method, which comprises the following steps:
(1) adding insoluble vat blue BC with the concentration of 6g/L into distilled water, stirring for 3 minutes at 200 r/min, then adding sodium hydroxide with the concentration of 6g/L and thiourea dioxide with the concentration of 6g/L, heating to 45 ℃, stirring for 10 minutes at 200 r/min, and stopping heating to obtain the vat dye leuco dye solution.
(2) Putting the polypropylene fiber fabric into the vat dye liquor according to a bath ratio of 1:30, wherein the dyeing starting temperature is 40 ℃, the temperature is raised to 130 ℃ at the heating rate of 1 ℃/min, and the temperature is kept for 60 min; then cooling to below 50 ℃ at the cooling rate of 3 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color.
(3) Placing the dyed polypropylene fiber fabric in a solution with a bath ratio of 1:30, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 20min, taking out, placing in a hydrogen peroxide solution with a bath ratio of 1:30 and a concentration of 1g/L, oxidizing at 45 ℃ for 30min, and washing with water.
(4) And (3) placing the oxidized polypropylene fabric in a solution with a bath ratio of 1:30, a soap powder concentration of 5g/L and a sodium carbonate concentration of 3g/L, boiling for 10min at 100 ℃, washing with running water, and drying to obtain the dyed polypropylene fabric.
Table 1 shows the performance parameters of examples 1 to 4 and comparative example 1
| Examples | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 |
| K/S | 4.53 | 3.91 | 4.25 | 4.17 | 1.87 |
Examples 1-5 and comparative example 1 were analyzed in conjunction with table 1: the polypropylene fabric dyed by the dyeing method in the embodiment 1-5 has an excellent K/S value which is far higher than that of the polypropylene fabric dyed by the conventional vat dye dyeing method in the comparative example 1, and the dyeing method provided by the invention can effectively improve the dyeing efficiency of the polypropylene fabric. The rare earth compound and the methylformanilide are added into the leuco solution of the vat dye to form a methylformanilide-rare earth-vat dye connector complex, and the methylformanilide has a swelling effect on the polypropylene fiber under the action of heat, so that the vat dye enters the fiber along with the connector complex, and the dyeing efficiency and the light fastness are obviously improved.
It should be noted that, as will be understood by those skilled in the art, the rare earth compound may also be other rare earth chlorides; the vat dye may also be one or more of the other insoluble vat dyes. Meanwhile, in the dyeing process, the setting of technological parameters such as the rotating speed, the reaction time, the reaction temperature and the like in the preparation of vat dye liquor, the dyeing of polypropylene fabrics and the post-dyeing treatment process can be adjusted according to the actual situation.
In summary, according to the post-dyeing method for the polypropylene fabric provided by the invention, the rare earth compound and the methylformanilide are added into the vat dye leuco solution to form the methylformanilide-rare earth-vat dye connector complex, and the methylformanilide is utilized to generate a swelling effect on the polypropylene fabric under the action of heat, so that the vat dye enters the interior of the fabric along with the connector complex, and the dyeing efficiency and the light fastness are obviously improved.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (5)
1. The post-dyeing method of the polypropylene fabric is characterized by comprising the following steps:
s1, preparing vat dye liquor: adding vat dye with the concentration of 5-9 g/L into distilled water, uniformly stirring, then adding sodium hydroxide with the concentration of 5-9 g/L and thiourea dioxide with the concentration of 5-9 g/L, heating to 30-90 ℃, stirring for reaction to obtain a vat dye leuco body, and stopping heating; then adding 0.2-0.5% owf of rare earth compound based on the weight of the fabric, and stirring to complex the rare earth compound to form a vat dye-rare earth compound connector complex; finally, adding 30-60 g/L of methyl formanilide, and stirring to form a connector complex of the methyl formanilide-rare earth-vat dye, thus obtaining vat dye liquor;
s2, dyeing of polypropylene fabric: putting the polypropylene fabric into the vat dye solution obtained in the step S1 according to a bath ratio of 1: 20-1: 40, heating to 115-140 ℃ at a heating rate of 1 ℃/min, and keeping the temperature for 40-80 min to dye the polypropylene fabric; then cooling to below 40 ℃ at a cooling rate of 2 ℃/min, taking out the dyed polypropylene fabric, and cleaning the floating color;
s3, reduction and oxidation of vat dye: reducing and oxidizing the dyed polypropylene fabric in the step S2, and then washing with water;
s4, post-processing: and (4) soaping the polypropylene fabric subjected to the oxidation treatment in the step (S3), and then cleaning and drying to obtain the dyed polypropylene fabric.
2. The method for post-dyeing polypropylene fiber fabric according to claim 1, wherein in step S1, the rare earth compound includes but is not limited to one or more of rare earth chlorides.
3. The method for post-dyeing polypropylene fiber fabric as claimed in claim 2, wherein the rare earth chloride is cerium chloride or lanthanum chloride.
4. A method for post-dyeing polypropylene fabrics according to claim 1 or 2, wherein in step S1, the vat dyes include but are not limited to one or more insoluble vat dyes.
5. The method for post-dyeing polypropylene fiber fabric according to any one of claims 1 to 4, wherein in step S3, the reduction and oxidation treatment steps comprise: and (4) placing the dyed polypropylene fiber fabric in the step (S2) in a solution with a bath ratio of 1: 25-1: 40, a thiourea dioxide concentration of 3g/L and a sodium hydroxide concentration of 4g/L, carrying out reduction treatment at 30 ℃ for 10-30 min, taking out, placing into a hydrogen peroxide solution with a bath ratio of 1: 25-1: 40 and a concentration of 1g/L, carrying out oxidation treatment at 30-60 ℃ for 10-60 min, and then washing with water.
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| CN106232898A (en) * | 2014-04-14 | 2016-12-14 | 帝人株式会社 | Organic fiber, cloth and silk and the dress material of coloring and the manufacture method of cloth and silk |
| CN109338747A (en) * | 2018-09-28 | 2019-02-15 | 河南工程学院 | A kind of colouring method of reducing dye thiourea dioxide low-temperature reduction |
| CN109403100A (en) * | 2018-09-28 | 2019-03-01 | 河南工程学院 | A kind of preparation of disperse dyes thiourea dioxide low-temperature reduction cleaning catalyst and process for reductive post-cleaning |
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| CN106232898A (en) * | 2014-04-14 | 2016-12-14 | 帝人株式会社 | Organic fiber, cloth and silk and the dress material of coloring and the manufacture method of cloth and silk |
| CN109338747A (en) * | 2018-09-28 | 2019-02-15 | 河南工程学院 | A kind of colouring method of reducing dye thiourea dioxide low-temperature reduction |
| CN109403100A (en) * | 2018-09-28 | 2019-03-01 | 河南工程学院 | A kind of preparation of disperse dyes thiourea dioxide low-temperature reduction cleaning catalyst and process for reductive post-cleaning |
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