CN110820367A - Method for improving dye uptake of disperse dye on fiber fabric - Google Patents
Method for improving dye uptake of disperse dye on fiber fabric Download PDFInfo
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- CN110820367A CN110820367A CN201911159973.9A CN201911159973A CN110820367A CN 110820367 A CN110820367 A CN 110820367A CN 201911159973 A CN201911159973 A CN 201911159973A CN 110820367 A CN110820367 A CN 110820367A
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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
- D06P1/16—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 dispersed, e.g. acetate, dyestuffs
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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
- D06P1/6735—Salts or hydroxides of alkaline or alkaline-earth metals with anions different from those provided for in D06P1/67341
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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
- D06P1/6735—Salts or hydroxides of alkaline or alkaline-earth metals with anions different from those provided for in D06P1/67341
- D06P1/67358—Halides or oxyhalides
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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
- D06P1/6735—Salts or hydroxides of alkaline or alkaline-earth metals with anions different from those provided for in D06P1/67341
- D06P1/67366—Phosphates or polyphosphates
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Abstract
The invention relates to the technical field of dyeing and environmental protection, and discloses a method for improving the dye uptake of disperse dyes on fiber fabrics, which not only solves the problems of low dyeing efficiency, uneven dyeing and overhigh cost caused by improving the dye uptake by adopting high temperature and high pressure in the prior art by researching the dye structure and the dyeing principle, but also comprises the steps of preparing a dye carrier, performing dyeing pretreatment on the fiber fabrics, dyeing at low temperature, drying and washing by water, wherein the prepared dye carrier can enlarge the gaps among contact molecules between the dyes and the fiber fabrics, promote the diffusion and adsorption of the disperse dyes on the surfaces of the fiber fabrics, is favorable for dyeing, can improve the dye uptake of the disperse dyes, greatly protects the integrity of the fabrics, ensures the uniform color and luster of dyed products, has high firmness, can well overcome the defects in the dyeing process of the existing disperse dyes, and improves the comprehensive utilization rate of the dyes, the cost is reduced, and the dye uptake of the disperse dye on the fiber fabric is improved.
Description
Technical Field
The invention belongs to the technical field of dyeing and environmental protection, and particularly relates to a method for improving the dye uptake of disperse dye on a fiber fabric.
Background
The disperse dye is a dye with small molecular weight and no water-soluble group in the structure. When dyeing, the dye must be uniformly dispersed in the dye liquor by means of a dispersant, so that the fiber such as polyester can be dyed. The disperse dye is mainly used for dyeing polyester fiber (terylene) acetate fiber (diacetate fiber and triacetate fiber) and polyamide fiber (chinlon) in chemical fiber, and has little application to polyacrylonitrile (acrylon). The chemical fiber textile product printed and dyed by the disperse dye has bright color, excellent washing fastness and wide application. Because it is insoluble in water, has no dyeing ability to cotton, hemp, wool and silk in natural fiber, and hardly sticks to viscose fiber, the chemical fiber blended product usually needs to use disperse dye and other suitable dyes. Although the disperse dye does not contain water-soluble groups, the disperse dye contains some polar groups and hydrophilic groups, so that the disperse dye has trace solubility in an aqueous solution, and the disperse dye is used for dyeing fiber fabrics in water mainly depending on the number of the contained polar groups, the molecular weight, the temperature of a dye solution and the like, and is greatly influenced by the change of external conditions, so that the water solubility is increased, the dye uptake is influenced, and the dye waste is caused.
Although there are many new methods for dyeing with disperse dyes, there are problems that the dyes are not fully developed, the materials are wasted, and the dye uptake rate is pursued during processing, so that the complexity of the process is increased, and the green and healthy goals cannot be achieved.
Disclosure of Invention
The invention aims to provide a method for improving the dye uptake of disperse dyes on fiber fabrics, which aims to solve the existing problems, improve the comprehensive utilization rate of the dyes, reduce the cost and improve the dye uptake of the disperse dyes on the fiber fabrics.
The invention is realized by the following technical scheme:
a method for improving the dye uptake of disperse dyes on fiber fabrics comprises the steps of preparing a dye carrier, performing dyeing pretreatment on the fiber fabrics, dyeing at low temperature, air-drying and washing;
the important technical means is to prepare a dye carrier and perform dyeing pretreatment on the fiber fabric.
Specifically, the method comprises the following process steps:
s1 preparation of dye carrier: weighing 1.5-1.6 millimoles of europium nitrate and 3.4-3.7 millimoles of magnesium chloride, dissolving the europium nitrate and the magnesium chloride in an ethylene glycol aqueous solution at a material-liquid ratio of 1:20-22 to form a uniform solution, adding 4.6-5.0 grams of sodium acetate into the solution, heating to 35-40 ℃, continuously stirring for 40-50 minutes, transferring the solution into a reaction kettle, pressurizing, heating for reaction at the reaction temperature of 230 ℃ and 240 ℃ for 2-3 hours, naturally cooling to room temperature along with the furnace after the reaction is finished, taking out reactants, sequentially washing the reactants for 3-5 times by using ethanol and deionized water, and drying the reactants in an oven at the temperature of 80-90 ℃ for 5-8 hours to obtain the porous dye carrier with high specific surface area; the dye carrier can play a role of a bridge during dyeing, has good affinity with fiber fabrics, and can quickly diffuse carried disperse dyes into fibers to form a high-concentration dyeing interlayer when the fiber fabrics are contacted, so that the driving force of dyeing is improved, various fastnesses after dyeing are greatly improved, and the dye carrier is free of toxic and harmful components and can be recycled.
The mass concentration of the ethylene glycol aqueous solution is 18-20%; the pressure and temperature rise reaction pressure in the reaction kettle is 1.45-1.50 MPa; the particle size of the obtained product is between 40 and 60 nanometers, the specific surface area reaches 580-600 cubic meters per gram, and the pore volume reaches 0.7 to 0.8 cubic centimeters per gram.
S2 fiber fabric dyeing pretreatment: soaking the fiber fabric to be dyed in ammonium dihydrogen phosphate solution with the concentration of 70-80ppm for 10-15 minutes at the soaking temperature of 24-26 ℃, washing with water for 2-3 times after soaking, then dispersing the prepared dye carrier into sodium chloride aqueous solution with the material-liquid ratio of 1:800-850, ultrasonically dispersing for 10-15 minutes, placing the fiber fabric after washing in dispersion liquid with the material-liquid ratio of 1:2.5-3.0, soaking for 20-30 minutes, continuing to ultrasonically disperse for 10-20 minutes, and dyeing as a mixed material.
The mass concentration of the sodium chloride aqueous solution is 0.2-0.3%.
S3 low temperature dyeing: preparing a disperse dye solution with the concentration of 1.2 percent (owf), and adjusting the pH value of the dye solution to be between 8.5 and 8.8 by using a sodium carbonate buffer solution; adding the pre-treated fiber fabric mixture, dyeing according to the bath ratio of 1:8-9, heating and dyeing at normal pressure, wherein the dyeing temperature is 45-50 ℃, the dyeing time is 20-25 minutes, and cooling to 20-24 ℃.
The pH value of the sodium carbonate buffer solution is between 9.0 and 9.2.
S4 washing with water and air drying: after dyeing is finished, the fabric is taken out and washed by water, soaped and dried by a conventional method, and the dye carrier particles are recovered, washed and dried for reuse.
Wherein the air drying temperature of the fiber fabric is 55-60 ℃.
Compared with the prior art, the invention has the following advantages: in order to solve the problem of low dye uptake of disperse dyes on fiber fabrics, the invention provides a method for improving the dye uptake of disperse dyes on fiber fabrics, through the research on a dye structure and a dyeing principle, the method not only solves the problems of low dyeing efficiency, uneven dyeing and overhigh cost caused by adopting high temperature and high pressure to improve the dye uptake in the prior art, and comprises the steps of preparing a dye carrier, performing dyeing pretreatment on the fiber fabrics, dyeing at low temperature, air drying and washing, the prepared dye carrier can increase the contact intermolecular gap between the dye and the fiber fabrics, promote the diffusion and adsorption of the disperse dyes on the surface of the fiber fabrics, is beneficial to dyeing, the disperse dyes can be dyed at lower temperature and normal pressure, the dye uptake of the disperse dyes can be improved, the integrity of the fabrics is greatly protected, the dyeing products are uniform in color and high in fastness, the process can well solve the defects in the dyeing process of the existing disperse dye, does not add harmful substances in the dyeing process, has no impurity residue, improves the comprehensive utilization rate of the dye, reduces the cost, improves the dye uptake of the disperse dye on fiber fabrics, effectively solves the problem of low dye uptake of the disperse dye on the fiber fabrics, has the characteristics of low cost, low energy consumption and quick color fixation, greatly reduces the steps of the dyeing processing process, basically has no resource waste in the process treatment process, completely accords with the national regulations of wastewater discharge, can realize the realistic significance of improving the work efficiency of the garment dyeing processing industry and improving the market competitiveness, the method has higher value for the research of the continuous production process method of disperse dye dyeing, obviously promotes the rapid development of modern dyeing and environmental protection industry and the sustainable development of resources, and is a technical scheme which is extremely worthy of popularization and use.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a flow chart of a method of increasing the dye uptake of disperse dyes on a fibrous fabric according to the present invention;
FIG. 2 is a graph showing the effect of different dyeing temperatures on the dye uptake of disperse dyes in the dyeing process of fiber fabrics.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
A method for improving the dye uptake of disperse dyes on fiber fabrics comprises the steps of preparing a dye carrier, performing dyeing pretreatment on the fiber fabrics, dyeing at low temperature, air-drying and washing;
specifically, the method comprises the following process steps:
preparing a dye carrier: weighing 1.5 millimole europium nitrate and 3.4 millimole magnesium chloride, dissolving in an ethylene glycol aqueous solution at a material-liquid ratio of 1:20 to form a uniform solution, adding 4.6 g of sodium acetate into the solution, heating to 35 ℃, continuously stirring for 40 minutes, transferring to a reaction kettle, pressurizing, heating for reaction at 230 ℃ for 2 hours, naturally cooling to room temperature along with a furnace after the reaction is finished, taking out reactants, sequentially washing for 3 times by using ethanol and deionized water, and drying in an oven at 80 ℃ for 5 hours to obtain the porous high specific surface area dye carrier.
The mass concentration of the ethylene glycol aqueous solution is 18 percent; the pressure and temperature rise reaction pressure in the reaction kettle is 1.45 MPa; the grain size of the obtained product is between 40 and 60 nanometers, the specific surface area reaches 580 cubic meters per gram, and the pore volume reaches 0.7 cubic centimeters per gram.
Fiber fabric dyeing pretreatment: soaking the fiber fabric to be dyed in ammonium dihydrogen phosphate solution with the concentration of 70ppm for 10 minutes at the soaking temperature of 24 ℃, washing for 2 times after soaking, then dispersing the prepared dye carrier into sodium chloride aqueous solution with the material-liquid ratio of 1:800, performing ultrasonic dispersion for 10 minutes, placing the fiber fabric after washing in dispersion liquid with the material-liquid ratio of 1:2.5, soaking for 20 minutes, and continuing ultrasonic dispersion for 10 minutes to obtain a mixed material, thus dyeing.
The mass concentration of the sodium chloride aqueous solution is 0.2%.
S3 low temperature dyeing: preparing a disperse dye solution with the concentration of 1.2 percent (owf), and adjusting the pH value of the dye solution to be between 8.5 and 8.8 by using a sodium carbonate buffer solution; adding the pretreated fiber fabric mixed material, dyeing according to the bath ratio of 1:8, heating and dyeing at normal pressure, wherein the dyeing temperature is 45 ℃, the dyeing time is 20 minutes, and the temperature is reduced to 20 ℃.
In an alternative of this embodiment, the disperse dye is disperse red FB; the pH value of the sodium carbonate buffer solution is between 9.0 and 9.2.
S4 washing with water and air drying: after dyeing is finished, the fabric is taken out and washed by water, soaped and dried by a conventional method, and the dye carrier particles are recovered, washed and dried for reuse.
Wherein the air drying temperature of the fiber fabric is 55 ℃.
Example 2
A method for improving the dye uptake of disperse dyes on fiber fabrics comprises the steps of preparing a dye carrier, performing dyeing pretreatment on the fiber fabrics, dyeing at low temperature, air-drying and washing;
specifically, the method comprises the following process steps:
s1 preparation of dye carrier: weighing 1.55 millimole europium nitrate and 3.5 millimole magnesium chloride, dissolving in an ethylene glycol aqueous solution at a material-liquid ratio of 1:21 to form a uniform solution, adding 4.8 g of sodium acetate into the solution, heating to 38 ℃, continuously stirring for 45 minutes, transferring to a reaction kettle, pressurizing, heating for reaction at 235 ℃ for 2.5 hours, naturally cooling to room temperature along with a furnace after the reaction is finished, taking out reactants, washing with ethanol and deionized water for 4 times in sequence, and drying in an oven at 85 ℃ for 6 hours to obtain the porous high specific surface area dye carrier.
The mass concentration of the ethylene glycol aqueous solution is 19%; the pressure and temperature rise reaction pressure in the reaction kettle is 1.48 MPa; the particle size of the obtained product is between 40 and 60 nanometers, the specific surface area reaches 590 cubic meters per gram, and the pore volume reaches 0.75 cubic centimeters per gram.
S2 fiber fabric dyeing pretreatment: soaking the fiber fabric to be dyed in 75ppm ammonium dihydrogen phosphate solution for 12 minutes at 25 ℃, washing with water for 2 times after soaking, then dispersing the prepared dye carrier into sodium chloride aqueous solution at a material-liquid ratio of 1:820, performing ultrasonic dispersion for 12 minutes, placing the fiber fabric after washing in dispersion liquid at a material-liquid ratio of 1:2.8, soaking for 25 minutes, and continuing ultrasonic dispersion for 15 minutes to obtain a mixed material, thus dyeing.
The mass concentration of the sodium chloride aqueous solution is 0.25%.
S3 low temperature dyeing: preparing a disperse dye solution with the concentration of 1.2 percent (owf), and adjusting the pH value of the dye solution to be between 8.5 and 8.8 by using a sodium carbonate buffer solution; adding the pretreated fiber fabric mixture, dyeing according to the bath ratio of 1:8.5, heating and dyeing at normal pressure, wherein the dyeing temperature is 48 ℃, the dyeing time is 22 minutes, and the temperature is reduced to 22 ℃.
In an alternative of this embodiment, the disperse dye is disperse red FB; the pH value of the sodium carbonate buffer solution is between 9.0 and 9.2.
S4 washing with water and air drying: after dyeing is finished, the fabric is taken out and washed by water, soaped and dried by a conventional method, and the dye carrier particles are recovered, washed and dried for reuse.
Wherein the air drying temperature of the fiber fabric is 58 ℃.
Example 3
A method for improving the dye uptake of disperse dyes on fiber fabrics comprises the steps of preparing a dye carrier, performing dyeing pretreatment on the fiber fabrics, dyeing at low temperature, air-drying and washing;
specifically, the method comprises the following process steps:
s1 preparation of dye carrier: weighing 1.6 millimole europium nitrate and 3.7 millimole magnesium chloride, dissolving in an ethylene glycol aqueous solution at a material-liquid ratio of 1:22 to form a uniform solution, adding 5.0 g of sodium acetate into the solution, heating to 40 ℃, continuously stirring for 50 minutes, transferring to a reaction kettle, pressurizing, heating for reaction at 240 ℃ for 3 hours, naturally cooling to room temperature along with a furnace after the reaction is finished, taking out reactants, sequentially washing for 5 times by using ethanol and deionized water, and drying in a 90 ℃ oven for 8 hours to obtain the porous high specific surface area dye carrier.
The mass concentration of the ethylene glycol aqueous solution is 20%; the pressure and temperature rise reaction pressure in the reaction kettle is 1.50 MPa; the grain size of the obtained product is between 40 and 60 nanometers, the specific surface area reaches 600 cubic meters per gram, and the pore volume reaches 0.8 cubic centimeters per gram.
S2 fiber fabric dyeing pretreatment: soaking the fiber fabric to be dyed in 80ppm ammonium dihydrogen phosphate solution for 15 minutes at 26 ℃, washing with water for 3 times after soaking, then dispersing the prepared dye carrier into sodium chloride aqueous solution at a material-to-liquid ratio of 1:850, performing ultrasonic dispersion for 15 minutes, placing the fiber fabric after washing in dispersion liquid at a material-to-liquid ratio of 1:3.0, soaking for 30 minutes, and continuing ultrasonic dispersion for 20 minutes to obtain a mixed material for dyeing.
The mass concentration of the sodium chloride aqueous solution is 0.3%.
S3 low temperature dyeing: preparing a disperse dye solution with the concentration of 1.2 percent (owf), and adjusting the pH value of the dye solution to be between 8.5 and 8.8 by using a sodium carbonate buffer solution; adding the pretreated fiber fabric mixture, dyeing according to the bath ratio of 1:9, heating and dyeing at normal pressure, wherein the dyeing temperature is 50 ℃, the dyeing time is 25 minutes, and the temperature is reduced to 24 ℃.
In an alternative of this embodiment, the disperse dye is disperse red FB; the pH value of the sodium carbonate buffer solution is between 9.0 and 9.2.
S4 washing with water and air drying: after dyeing is finished, the fabric is taken out and washed by water, soaped and dried by a conventional method, and the dye carrier particles are recovered, washed and dried for reuse.
Wherein the air drying temperature of the fiber fabric is 60 ℃.
The relationship between dyeing temperature and dye uptake in the dyeing treatment of the fiber fabrics was compared while keeping the independent variables consistent, and the results are shown in FIG. 2: the dyeing temperature involved in the treatment method provided by the invention is shown to obtain the best dyeing dye-uptake.
The invention effectively solves the problem of low dye-uptake of disperse dyes on fiber fabrics, has the characteristics of low cost, low energy consumption and quick color fixation, greatly reduces dyeing processing process steps, basically has no resource waste in the process treatment process, completely meets the national regulations on wastewater discharge, can realize the practical significance of improving the work efficiency of the garment dyeing processing industry and improving the market competitiveness, has higher value for the research of the disperse dye dyeing continuous production process method, obviously promotes the rapid development and the resource sustainable development of the modern dyeing and environmental protection industry, and is a technical scheme which is extremely worthy of popularization and use.
Claims (7)
1. A method for improving the dye uptake of disperse dyes on fiber fabrics is characterized in that a dye carrier is prepared, and the fiber fabrics are subjected to dyeing pretreatment; the method comprises the following process steps:
(1) weighing 1.5-1.6 millimoles of europium nitrate and 3.4-3.7 millimoles of magnesium chloride, dissolving the europium nitrate and the magnesium chloride in an ethylene glycol aqueous solution at a material-liquid ratio of 1:20-22 to form a uniform solution, adding 4.6-5.0 grams of sodium acetate into the solution, heating to 35-40 ℃, continuously stirring for 40-50 minutes, transferring the solution into a reaction kettle, pressurizing, heating for reaction at the reaction temperature of 230 ℃ and 240 ℃ for 2-3 hours, naturally cooling to room temperature along with the furnace after the reaction is finished, taking out reactants, sequentially washing the reactants for 3-5 times by using ethanol and deionized water, and drying the reactants in an oven at the temperature of 80-90 ℃ for 5-8 hours to obtain the porous dye carrier with high specific surface area;
(2) fiber fabric dyeing pretreatment: soaking the fiber fabric to be dyed in an ammonium dihydrogen phosphate solution for 10-15 minutes at the soaking temperature of 24-26 ℃, washing with water for 2-3 times after soaking, then dispersing the dye carrier prepared in the step (1) into a sodium chloride aqueous solution at the material-liquid ratio of 1:800, performing ultrasonic dispersion for 10 minutes, placing the fiber fabric after washing in a dispersion solution at the material-liquid ratio of 1:2.5, soaking for 20 minutes, and continuing ultrasonic dispersion for 10 minutes to obtain a mixed material, thus dyeing.
2. The method for improving the dye uptake of disperse dyes on fiber fabrics according to claim 1, wherein the mass concentration of the ethylene glycol aqueous solution in the step (1) is 18-20%.
3. The method for improving the dye uptake of disperse dyes on fiber fabrics according to claim 1, wherein the reaction pressure of the reaction kettle in the step (1) is 1.45-1.50 MPa.
4. The method for increasing the dye uptake of disperse dyes onto fiber fabrics as claimed in claim 1, wherein the specific surface area of the dye carrier in step (1) is up to 580-600 cc/g and the pore volume is up to 0.7-0.8 cc/g.
5. The method for increasing the dye uptake of disperse dyes onto fabrics of claim 1 wherein the particle size of the dye carrier product of step (1) is between 40 and 60 nm.
6. The method for improving the dye uptake of disperse dyes onto fiber fabrics according to claim 1, wherein the concentration of the ammonium dihydrogen phosphate solution in the step (1) is 70-80 ppm.
7. The method for improving the dye uptake of disperse dyes on fiber fabrics according to claim 1, wherein the mass concentration of the sodium chloride aqueous solution in the step (2) is 0.2-0.3%.
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| CN117364536A (en) * | 2023-10-16 | 2024-01-09 | 仙鹤股份有限公司 | Preparation method of blue medical operating gown non-woven fabric base paper |
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