CN111155338A - Dyeing process for regenerated polyester yarn - Google Patents
Dyeing process for regenerated polyester yarn Download PDFInfo
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- CN111155338A CN111155338A CN202010028488.4A CN202010028488A CN111155338A CN 111155338 A CN111155338 A CN 111155338A CN 202010028488 A CN202010028488 A CN 202010028488A CN 111155338 A CN111155338 A CN 111155338A
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Abstract
The regenerated polyester yarn dyeing process comprises the following steps of loose spooling, caging, deoiling pretreatment, dyeing, color fixing, washing and drying. In the third step, the pretreatment is to use pretreatment liquid to pretreat the cone yarn; the used pretreatment liquid contains an anion deoiling agent and a swelling agent; then adding the mixed solution of polyether ester and chitosan. According to the dyeing process of the regenerated polyester yarn, disclosed by the invention, polyester fibers are commonly used by adopting a swelling agent, polyester molecules are grafted with chitosan and polyether ester by adopting an initiator, and the polyester molecules are further combined with reactive dyes, so that the color fastness of the fibers can be improved. And the anti-yellowing capability of the yarn can be improved through the treatment of the anti-yellowing agent, and through tests, the woven fabric also has good color fastness and anti-yellowing capability, and still has good color fastness and anti-yellowing capability after being washed for many times.
Description
Technical Field
The invention relates to the technical field of regenerated polyester yarns, in particular to a dyeing process of regenerated polyester yarns.
Background
The traditional method for dyeing the polyester staple fibers is to dye the polyester staple fibers by using traditional disperse dyes at high temperature and high pressure. The dyeing method is characterized by impurity removal by prior treatment, high-temperature and high-pressure dyeing, a two-bath method, more water consumption and uneven dyeing of regenerated polyester staple fibers. The specific process comprises the steps of raw material pretreatment impurity removal, high-temperature and high-pressure dyeing, water washing, soaping, water washing and drying, and has the defects of high cost, long production process flow, more water and high energy consumption. Therefore, people are actively searching for a method for dyeing polyester staple fibers by using other disperse dyes, such as alkali-resistant disperse dyes, in particular to a method for dyeing cotton type polyester staple fibers produced by PET bottle flakes. Compared with polyester staple fibers produced by taking virgin polyester chips as raw materials, the cotton type polyester staple fibers produced from PET bottle chips have large quality variation, unstable quality and more impurities, so the traditional dyeing methods are only limited to some low-end products or are only in a laboratory stage. For example, the short fiber with thick filler is dyed by the traditional dyeing method, and the short fiber cannot be used for spinning because the fiber is thick and uneven in strength; and (5) dyeing the flowers. The original traditional dyeing method is not suitable for dyeing cotton type polyester staple fibers produced by PET bottle chips. The color fastness of the existing regenerated terylene after dyeing is not high, and the regenerated terylene is easy to turn yellow.
Disclosure of Invention
The invention aims to provide a dyeing process of regenerated polyester yarns, so that the regenerated polyester yarns have excellent color fastness and anti-yellowing capability after being dyed.
In order to solve the technical problem, the invention aims to realize that:
the invention relates to a dyeing process of regenerated polyester yarns, which comprises the following steps: step one, loose spooling; step two, caging; step three, pretreatment of deoiling; step four, dyeing; step five, color fixation; step six, washing with water; step seven, drying;
in the first step, the polyester yarn is turned over onto the plastic bobbin according to the requirement through a loose bobbin winder, defects and impurities on the yarn are removed, a large yarn fluff winding angle is adopted, and a bobbin winding tension gradually-reducing device and a fluff winding pressure gradually-reducing device are arranged, so that the density of the fluff wound on the bobbin is reduced, the densities of the fluff wound on the inner layer and the fluff wound on the outer layer are uniform, and the loose bobbin yarn with uniform density and good forming is formed; the density of the cone-shaped yarn is 0.32-0.38g/cm3；
In the second step, the loose cone yarn is arranged on the yarn rod of the yarn cage according to the requirement, so that the loose cone yarn is in concave-convex connection on the yarn rod, and the top of the loose cone yarn is locked by a steel disc and a lock head;
in the third step, the pretreatment is carried out according to a bath ratio of 1: pretreating the cone yarn by using pretreatment liquid at a bath ratio of 5-10; the used pretreatment liquid contains an anion deoiling agent and a swelling agent; heating to 85-90 deg.C at room temperature at a rate of 0.5-1 deg.C/min, maintaining for 5-10min, adding mixed solution of polyether ester and chitosan, heating to 105 deg.C and 110 deg.C, and maintaining for 30-40 min; then cooling to room temperature according to the speed of 1-2 ℃/min; the dosage of the anti-ion degreaser is 2-5g/L, and the dosage of the swelling agent is 3-5 g/L;
in the fourth step, dyeing is carried out by adding a dyeing solution, a penetrating agent JFC, a penetration enhancer, an accelerating agent, a precipitation preventing agent, a leveling agent, a color fixing agent, an initiator and an anti-yellowing agent into the treatment solution in the last step, wherein the content of the dye in a dye vat is 5-8% o.w.f; the temperature rise process in the dyeing step is to dye from room temperature, raise the temperature to 125 ℃ within 15-20min, keep the temperature for 30-35min, then lower the temperature to 80-90 ℃ according to the speed of 1-2 ℃/min, keep the temperature for 30-35min, and then lower the temperature to room temperature according to the speed of 0.5-1 ℃/min; the dye solution contains reactive dye and metal chelating agent; the initiator is hydrogen peroxide or acetic acid;
in the fifth step, the color fixation is to take the yarn treated in the previous step out of a dye vat and place the yarn in a non-aqueous medium for color fixation, wherein the color fixation temperature rise process is to heat the yarn from room temperature to 80-90 ℃ according to the temperature rise rate of 0.5-1 ℃/min, and the color fixation time is 30-50 min;
and in the sixth step, the yarn after color fixation is treated in clear water at the temperature of 60-70 ℃ for 20-30 min.
As a further illustration of the scheme, in the third step, the dosage of the anionic degreaser is 5-10g/L, and the dosage of the swelling agent is 10-20 g/L.
As a further illustration of the scheme, in the fourth step, the dosage of the penetrating agent JFC is 5-10g/L, the dosage of the penetrating accelerant is 5-8g/L, the dosage of the dyeing accelerant is 5-10g/L, the dosage of the precipitation inhibitor is 3-5g/L, the dosage of the leveling agent is 10-20g/L, the dosage of the color fixing agent is 20-30g/L, the dosage of the initiator is 10-15g/L, and the dosage of the anti-yellowing agent is 30-40 g/L.
As a further illustration of the above scheme, the non-aqueous medium used is a low viscosity, high boiling point, low surface tension organic solvent, an easily recoverable solvent that is neither miscible with water nor capable of dissolving the reactive dye:
the viscosity of the non-aqueous medium is<50mm2/s；
The boiling point of the nonaqueous medium is 150-300 ℃;
the surface tension of the non-aqueous medium is 15 to 25dyn/cm (25 ℃).
As a further illustration of the above scheme, the anti-yellowing agent is prepared by putting bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid into an emulsification stirring kettle according to a specific proportion, heating to 120 ℃ and stirring, adding urea and distilled water, continuing stirring for 10-15min, adding lauryl alcohol polyvinyl ether, stirring uniformly, heating and refluxing for 0.5-2h, removing the solvent after the reaction is finished, extracting for 3-5 times with absolute ethyl alcohol, collecting the organic phase, sequentially washing with water, saturated sodium bicarbonate solution and salt, and purifying by silica gel column chromatography with the mass ratio of petroleum ether to acetone of 100: 1;
as a further explanation of the above embodiment, bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite, and o-acetylsalicylic acid were added to the emulsifying and stirring vessel in an amount of 1 part by mass, 1 to 2 parts by mass, and 1 to 2 parts by mass, respectively.
As a further explanation of the above scheme, 0.5 part by mass and 1 part by mass of urea and lauryl alcohol polyvinyl ether were added, respectively.
The invention has the beneficial effects that: according to the dyeing process of the regenerated polyester yarn, disclosed by the invention, polyester fibers are commonly used by adopting a swelling agent, polyester molecules are grafted with chitosan and polyether ester by adopting an initiator, and the polyester molecules are further combined with reactive dyes, so that the color fastness of the fibers can be improved. And the anti-yellowing capability of the yarn can be improved through the treatment of the anti-yellowing agent, and through tests, the woven fabric also has good color fastness and anti-yellowing capability, and still has good color fastness and anti-yellowing capability after being washed for many times.
Detailed Description
The present invention is further illustrated by the following specific examples.
Example one
The regenerated polyester yarn dyeing process related to the embodiment comprises the following steps: step one, loose spooling; step two, caging; step three, pretreatment of deoiling; step four, dyeing; step five, color fixation; step six, washing with water; and step seven, drying.
In the first step, the polyester yarn is turned over onto the plastic bobbin according to the requirement through a loose bobbin winder, defects and impurities on the yarn are removed, a large yarn fluff winding angle is adopted, and a bobbin winding tension gradually-reducing device and a fluff winding pressure gradually-reducing device are arranged, so that the density of the fluff wound on the bobbin is reduced, the densities of the fluff wound on the inner layer and the fluff wound on the outer layer are uniform, and the loose bobbin yarn with uniform density and good forming is formed; of said loose bobbin yarnThe density is 0.32-0.38g/cm3。
In this example, the loose cone yarn was used for antistatic treatment in a cone yarn dyeing apparatus. The adoption of the loose tube yarn for antistatic treatment can reduce the working procedures and improve the labor productivity. In order to meet the requirements of loose bobbin yarn treatment, two functions of constant fluff rolling ratio precise cross winding and numerical control layered winding are adopted to realize precise cross winding. During winding, a single spindle control driver is adopted, the real-time speed of the winding motor is calculated by collecting pulse signals of a feedback encoder of the winding motor in real time, and the yarn is rewound on a bobbin in the shape of a space spiral line according to the requirement of a precise winding process and the rotation speed of the winding motor and the definition of a winding ratio.
And the overfeed roller is adopted during winding, the yarn linear speed is certainly higher than the yarn bobbin unwinding linear speed in the precise winding process, the tension value is increased, excessive tension cannot obtain a high-quality yarn bobbin, the broken delivery of the yarn is increased, and the production efficiency is reduced. Therefore, overfeeding is used during winding, i.e. the yarn is fed out at a speed greater than the speed at which the yarn is wound. The state of the bobbin pulling yarn hard when the yarn is wound is changed into the state of winding the yarn gently, thereby reducing the broken ends and obtaining the satisfactory loose bobbin yarn. The overfeed amount of the yarn is controlled to be 1.02-1.06, in the embodiment, the overfeed amount can be determined according to the fineness of the yarn because the yarn is the regenerated polyester yarn, in the embodiment, 32tex regenerated polyester yarn is used, and the overfeed amount is 1.05. And controlling the density of the cone-loosening yarn to be 0.35g/cm3。
The main factors influencing the package of the cone yarn are as follows: speed, package pressure, tension, overfeed, angle of intersection, temperature and humidity. Regarding the winding speed, the linear speed of the loose bobbin yarn varies with the winding radius of the bobbin, and the variation of the linear speed directly causes the fluctuation of the winding tension, thereby affecting the forming quality of the bobbin and the mechanical and physical properties of the yarn. If the tension of the outer layer yarn is greater than that of the inner layer yarn, the edge expansion phenomenon that the outer layer yarn of the cone loosening yarn extrudes the inner layer yarn is easily generated; if the tension changes too much during the winding process, the difference of the yarn stretching ratio due to the difference of the winding tension is also easily caused, which requires that the fluctuation of the tension and the pressure during the winding process is reduced as much as possible. The speed of the loose cone winding is preferably 850 m/min.
The package pressure on the support rollers is adjusted and maintained according to the required package density and hardness. The package pressure is gradually increased, typically 2N, as the diameter of the yarn increases and the package weight increases, by the pneumatic means of the cheese adjusting and compensating the delivery pressure on the support rollers, and gradually increases with time.
In the second step, the loose cone yarn is installed on the yarn rod of the yarn cage according to the requirement, so that the loose cone yarn is in concave-convex connection on the yarn rod, and the top of the loose cone yarn is locked by a steel disc and a lock head.
In the third step, the pretreatment is carried out according to a bath ratio of 1: 5, pretreating the cone yarn by using pretreatment liquid in a bath ratio; the used pretreatment liquid contains an anion deoiling agent and a swelling agent; heating to 85 deg.C at room temperature at a rate of 0.5 deg.C/min, maintaining for 5min, adding mixed solution of polyether ester and chitosan, heating to 105 deg.C, and maintaining for 30 min; then cooling to room temperature according to 1 ℃/min. The dosage of the anionic degreaser is 5g/L, and the dosage of the swelling agent is 10 g/L.
The dosage of the mixed solution of polyether ester and chitosan is 20 g/L. The preparation process of the mixed solution of polyether ester and chitosan is as follows:
a. adding 40 parts of terephthalic acid and 20 parts of ethylene glycol by mass into a reaction vessel, heating to 180 ℃ at a heating rate of 0.5 ℃/min, and preserving heat for 1h until methanol is not distilled off;
b. and sequentially adding 3 parts of triphenyl phosphite, 2 parts of polyethylene glycol and 0.5 part of antimony trioxide into the reaction container which finishes the previous step, heating to 210 ℃, carrying out normal-pressure polycondensation for 1 hour under the condition of protective gas, then adding 10 parts of chitosan, slowly heating to 260 ℃, carrying out reduced-pressure polycondensation, keeping for 2 hours, and then cooling to 80 ℃.
Under the swelling treatment of the step, the polyester fiber is grafted with the polyether ester and the chitosan at the swelling position and can penetrate into the fiber. The fixation of the polyether ester and the dye can be improved by grafting the chitosan and the ultrahigh molecular weight polyethylene fiber and the polyester fiber.
In the fourth step, dyeing is carried out by adding a dyeing solution, a penetrating agent JFC, a penetration enhancer, an accelerating agent, a precipitation preventing agent, a leveling agent, a color fixing agent, an initiator and an anti-yellowing agent into the treatment solution in the last step, wherein the content of the dye in a dye vat is 5% o.w.f; the heating process in the dyeing step is to dye from room temperature, heat up to 120 ℃ within 15min, keep for 30min, then cool down to 80 ℃ according to the speed of 1 ℃/min, keep for 30min, and then cool down to room temperature according to the speed of 0.5 ℃/min; the dye solution contains reactive dye and metal chelating agent; the initiator is hydrogen peroxide or acetic acid. The dosage of the penetrating agent JFC is 5g/L, the dosage of the penetrating accelerant is 5g/L, the dosage of the accelerating agent is 5g/L, the dosage of the precipitation preventing agent is 3g/L, the dosage of the leveling agent is 10g/L, the dosage of the color fixing agent is 20g/L, the dosage of the initiator is 10g/L, and the dosage of the anti-yellowing agent is 30 g/L.
The anti-yellowing agent is prepared by putting bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid into an emulsification stirring kettle according to a specific proportion, heating to 120-130 ℃, stirring, adding urea and distilled water, continuously stirring for 10-15min, adding lauryl alcohol polyvinyl ether, stirring uniformly, heating and refluxing for 0.5-2h, removing the solvent after the reaction is finished, extracting for 3-5 times with absolute ethyl alcohol, collecting an organic phase, sequentially washing with water, saturated sodium bicarbonate solution and salt, and then carrying out chromatographic separation and purification by using a silica gel column with the mass ratio of petroleum ether to acetone being 100: 1.
The bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid are respectively added into an emulsifying and stirring kettle according to the proportion of 1 part by mass, 1 part by mass and 1 part by mass, and the added urea and lauryl alcohol polyvinyl ether are respectively 0.5 part by mass and 1 part by mass.
In the fifth step, the color fixation is to take the yarn treated in the previous step out of the dye vat and place the yarn in a non-aqueous medium for color fixation, wherein the color fixation temperature rise process is to heat the yarn from room temperature to 80 ℃ according to the temperature rise rate of 0.5 ℃/min, and the color fixation time is 30 min. The non-aqueous medium is an organic solvent with low viscosity, high boiling point and low surface tension, and is an easily-recycled solvent which is not mutually soluble with water and can not dissolve the reactive dye: the viscosity of the non-aqueous medium is<50mm2S; the boiling point of the nonaqueous medium is 150-300 ℃; the surface tension of the non-aqueous medium is 15 to 25dyn/cm (25 ℃).
And in the sixth step, the yarn after color fixation is treated in clear water at the temperature of 60-70 ℃ for 20-30 min.
The seventh step is that the yarn is dehydrated, the dehydrated yarn is dried by a high-frequency dryer, the yarn passes through a current field formed by an upper polar plate and a lower polar plate and a magnetic field formed by a magnet positioned outside the dryer, molecular motion of water molecules in the yarn in the current field is accelerated under the action of the current field, friction between the molecules is intensified to generate heat to form water vapor, and the water vapor is pumped into the air by an air exhauster; and due to the combined action of the magnetic field and the electric field, the antistatic agent can be better combined with the terylene molecules. The polarity in electric field and magnetic field can improve the combination ability of dye with terylene molecule and ultra-high molecular weight polyethylene fiber.
Example two
The regenerated polyester yarn dyeing process related to the embodiment comprises the following steps: step one, loose spooling; step two, caging; step three, pretreatment of deoiling; step four, dyeing; step five, color fixation; step six, washing with water; and step seven, drying.
In the first step, the polyester yarn is turned over onto the plastic bobbin through a loose bobbin winder according to the requirement, and the density of the loose bobbin yarn is 0.32-0.38g/cm3. The yarn overfeed amount is controlled to be 1.02-1.06,in the embodiment, the regenerated polyester yarn is used, and the overfeed amount can be determined according to the fineness of the yarn, and is 1.05 when the 32tex regenerated polyester yarn is used in the embodiment. And controlling the density of the cone-loosening yarn to be 0.35g/cm3. The speed of the loose cone winding is preferably 850 m/min. The package pressure was 2N and increased gradually with increasing time.
In the second step, the loose cone yarn is installed on the yarn rod of the yarn cage according to the requirement, so that the loose cone yarn is in concave-convex connection on the yarn rod, and the top of the loose cone yarn is locked by a steel disc and a lock head.
In the third step, the pretreatment is carried out according to a bath ratio of 1: the bath ratio of 10 is that the cheese is pretreated by using pretreatment liquid; the used pretreatment liquid contains an anion deoiling agent and a swelling agent; heating to 90 deg.C at room temperature at a heating rate of 1 deg.C/min, maintaining for 10min, adding mixed solution of polyether ester and chitosan, heating to 110 deg.C, and maintaining for 40 min; then the temperature is reduced to the room temperature according to the speed of 2 ℃/min. The dosage of the anionic degreaser is 10g/L, and the dosage of the swelling agent is 20 g/L.
The dosage of the mixed solution of polyether ester and chitosan is 20 g/L. The preparation process of the mixed solution of polyether ester and chitosan is as follows:
a. adding 50 parts of terephthalic acid and 30 parts of ethylene glycol by mass into a reaction vessel, heating to 190 ℃ at a heating rate of 1 ℃/min, and preserving heat for 3 hours until methanol is not distilled off;
b. and (2) sequentially adding 5 parts of triphenyl phosphite, 3 parts of polyethylene glycol and 1 part of antimony trioxide into the reaction container which finishes the previous step, heating to 220 ℃, carrying out polycondensation at normal pressure for 1 hour under the condition of protective gas, then adding 15 parts of chitosan, slowly heating to 280 ℃, carrying out reduced pressure polycondensation, keeping for 3 hours, and then cooling to 90 ℃.
In the fourth step, dyeing is carried out by adding a dyeing solution, a penetrating agent JFC, a penetration enhancer, an accelerating agent, a precipitation preventing agent, a leveling agent, a color fixing agent, an initiator and an anti-yellowing agent into the treatment solution in the last step, wherein the content of the dye in a dye vat is 5-8% o.w.f; the temperature rise process in the dyeing step is to dye from room temperature, raise the temperature to 125 ℃ within 15-20min, keep the temperature for 30-35min, then lower the temperature to 80-90 ℃ according to the speed of 1-2 ℃/min, keep the temperature for 30-35min, and then lower the temperature to room temperature according to the speed of 0.5-1 ℃/min; the dye solution contains reactive dye and metal chelating agent; the initiator is hydrogen peroxide or acetic acid. The dosage of the penetrating agent JFC is 5-10g/L, the dosage of the penetrating accelerant is 5-8g/L, the dosage of the accelerating agent is 5-10g/L, the dosage of the precipitation preventing agent is 5g/L, the dosage of the leveling agent is 20g/L, the dosage of the color fixing agent is 30g/L, the dosage of the initiator is 15g/L, and the dosage of the anti-yellowing agent is 40 g/L.
The anti-yellowing agent is prepared by putting bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid into an emulsification stirring kettle according to a specific proportion, heating to 130 ℃, stirring, adding urea and distilled water, continuously stirring for 15min, adding lauryl alcohol polyvinyl ether, stirring uniformly, heating and refluxing for 2h, removing the solvent after the reaction is finished, extracting for 5 times by using absolute ethyl alcohol, collecting an organic phase, sequentially washing by using water, a saturated sodium bicarbonate solution and salt water, and performing chromatographic separation and purification by using a silica gel column with the mass ratio of petroleum ether to acetone being 100: 1.
The bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid are respectively added into an emulsifying and stirring kettle according to 1 part by mass, 2 parts by mass and 2 parts by mass, and the added urea and lauryl alcohol polyvinyl ether are respectively 0.5 part by mass and 1 part by mass.
In the fifth step, the color fixation is to take the yarn treated in the previous step out of the dye vat and place the yarn in a non-aqueous medium for color fixation, and the color fixation temperature rise process is to rise from room temperature to room temperature according to the temperature rise rate of 1 ℃/minAnd the color fixing time is 50min at 90 ℃. The non-aqueous medium is an organic solvent with low viscosity, high boiling point and low surface tension, and is an easily-recycled solvent which is not mutually soluble with water and can not dissolve the reactive dye: the viscosity of the non-aqueous medium is<50mm2S; the boiling point of the nonaqueous medium is 150-300 ℃; the surface tension of the non-aqueous medium is 15 to 25dyn/cm (25 ℃).
And in the sixth step, the yarn subjected to color fixation is treated in clean water at 70 ℃ for 30 min.
The seventh step is that the yarn is dehydrated, the dehydrated yarn is dried by a high-frequency dryer, the yarn passes through a current field formed by an upper polar plate and a lower polar plate and a magnetic field formed by a magnet positioned outside the dryer, molecular motion of water molecules in the yarn in the current field is accelerated under the action of the current field, friction between the molecules is intensified to generate heat to form water vapor, and the water vapor is pumped into the air by an air exhauster; and due to the combined action of the magnetic field and the electric field, the antistatic agent can be better combined with the terylene molecules. The polarity in electric field and magnetic field can improve the combination ability of dye with terylene molecule and ultra-high molecular weight polyethylene fiber.
Comparative example
The yarn used in the dyeing process of the regenerated polyester yarn related to the comparative example is the same as that in the first embodiment, and the specific dyeing process comprises the following steps:
a. selecting alkali-resistant disperse dye, weighing more than 80% of materials in the alkali-resistant disperse dye, and grinding the materials until the fineness reaches 2 micrometers. The alkali-resistant disperse dye is H-3BN red.
b. Adopting a one-bath one-step pretreatment dyeing method, firstly adding regenerated polyester staple fibers into a dye vat, and adding an alkaline agent Na according to a dyeing bath ratio of 1:72CO3Uniformly dissolving the penetrating agent GL and the chelating dispersant DF101, putting the mixture into a dye vat, and adding the alkali-resistant disperse dye into the dye vat according to the content of 20g/L to obtain the mixed dye solution. 35g/L of soda ash agent, 0.61g/L of uniform penetrating agent GL and 1.1g/L of chelating dispersant DF 101.
c. Adjusting the pH value of the mixed dye liquor to 13, keeping the liquid level of the dye liquor stable, heating the temperature of the mixed dye liquor to 90 ℃ according to 3 ℃/min, heating to 132 ℃ according to 1 ℃/min, and keeping the temperature for 1 hour. The pH regulator is one or more of sodium dihydrogen phosphate, ammonium dihydrogen phosphate or disodium hydrogen phosphate.
d. And (3) washing the dyed fiber with water, controlling the temperature to be 65 ℃ for 10 minutes, draining the liquid, adding water and a detergent, heating to 98 ℃, soaping for 10 minutes, and then washing with water at 65 ℃ for 10 minutes to finish dyeing. The detergent is SW soaping agent.
The yarns prepared in examples one, two and comparative examples were tested for K/S value, color fastness and yellowing resistance, and were washed 10 times before being tested for color fastness and yellowing resistance.
The test structure after washing for 10 times is as follows:
from the above test results, the yarns prepared in the first and second examples have good color fastness and anti-yellowing capability.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (7)
1. A dyeing process for regenerated polyester yarns comprises the following steps: step one, loose spooling; step two, caging; step three, pretreatment of deoiling; step four, dyeing; step five, color fixation; step six, washing with water; step seven, drying; the method is characterized in that:
in the first step, the polyester yarn is turned over onto the plastic bobbin according to the requirement through a loose bobbin winder, defects and impurities on the yarn are removed, a large yarn fluff winding angle is adopted, and a bobbin winding tension gradually-reducing device and a fluff winding pressure gradually-reducing device are arranged, so that the density of the fluff wound on the bobbin is reduced, the densities of the fluff wound on the inner layer and the fluff wound on the outer layer are uniform, and the loose bobbin yarn with uniform density and good forming is formed; the density of the cone-shaped yarn is 0.32-0.38g/cm3；
In the second step, the loose cone yarn is arranged on the yarn rod of the yarn cage according to the requirement, so that the loose cone yarn is in concave-convex connection on the yarn rod, and the top of the loose cone yarn is locked by a steel disc and a lock head;
in the third step, the pretreatment is carried out according to a bath ratio of 1: pretreating the cone yarn by using pretreatment liquid at a bath ratio of 5-10; the used pretreatment liquid contains an anion deoiling agent and a swelling agent; heating to 85-90 deg.C at room temperature at a rate of 0.5-1 deg.C/min, maintaining for 5-10min, adding mixed solution of polyether ester and chitosan, heating to 105 deg.C and 110 deg.C, and maintaining for 30-40 min; then cooling to room temperature according to the speed of 1-2 ℃/min;
in the fourth step, dyeing is carried out by adding a dyeing solution, a penetrating agent JFC, a penetration enhancer, an accelerating agent, a precipitation preventing agent, a leveling agent, a color fixing agent, an initiator and an anti-yellowing agent into the treatment solution in the last step, wherein the content of the dye in a dye vat is 5-8% o.w.f; the temperature rise process in the dyeing step is to dye from room temperature, raise the temperature to 125 ℃ within 15-20min, keep the temperature for 30-35min, then lower the temperature to 80-90 ℃ according to the speed of 1-2 ℃/min, keep the temperature for 30-35min, and then lower the temperature to room temperature according to the speed of 0.5-1 ℃/min; the dye solution contains reactive dye and metal chelating agent; the initiator is hydrogen peroxide or acetic acid;
in the fifth step, the color fixation is to take the yarn treated in the previous step out of a dye vat and place the yarn in a non-aqueous medium for color fixation, wherein the color fixation temperature rise process is to heat the yarn from room temperature to 80-90 ℃ according to the temperature rise rate of 0.5-1 ℃/min, and the color fixation time is 30-50 min;
and in the sixth step, the yarn after color fixation is treated in clear water at the temperature of 60-70 ℃ for 20-30 min.
2. The dyeing process of the regenerated polyester yarn as claimed in claim 1, wherein in step three, the dosage of the anionic degreaser is 5-10g/L, and the dosage of the swelling agent is 10-20 g/L.
3. The dyeing process of the regenerated polyester yarn according to claim 1, characterized in that in the fourth step, the dosage of the penetrating agent JFC is 5-10g/L, the dosage of the penetrating accelerant is 5-8g/L, the dosage of the accelerating agent is 5-10g/L, the dosage of the precipitation inhibitor is 3-5g/L, the dosage of the leveling agent is 10-20g/L, the dosage of the fixing agent is 20-30g/L, the dosage of the initiator is 10-15g/L, and the dosage of the anti-yellowing agent is 30-40 g/L.
4. The dyeing process of regenerated polyester yarn according to claim 1, characterized in that the non-aqueous medium is organic solvent with low viscosity, high boiling point and low surface tension, which is easily recoverable solvent not miscible with water nor capable of dissolving reactive dye:
the viscosity of the non-aqueous medium is<50mm2/s；
The boiling point of the nonaqueous medium is 150-300 ℃;
the surface tension of the non-aqueous medium is 15 to 25dyn/cm (25 ℃).
5. The dyeing process of the regenerated terylene yarn as claimed in claim 1, wherein the anti-yellowing agent is silica gel column chromatography separation purification with a mass ratio of 100: 1 for purifying bis (2,2,6, 6-tetramethyl-4-piperidyl) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidinyl) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidyl stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid according to a specific ratio, heating to 120 ℃ and stirring at 130 ℃, adding urea and distilled water and continuing stirring for 10-15min, adding lauryl alcohol polyethylene ether and stirring uniformly, heating and refluxing for 0.5-2h, removing solvent after the reaction is finished, extracting with absolute ethyl alcohol for 3-5 times, collecting organic phase, sequentially using water, saturated sodium bicarbonate solution and salt water for washing, and using petroleum ether and acetone for chromatographic separation.
6. The dyeing process for the regenerated polyester yarn as claimed in claim 5, wherein the bis (2,2,6, 6-tetramethyl-4-piperidine) sebacate, poly (1-hydroxy-2, 2,6, 6-tetramethyl-4-hydroxypiperidine) succinate, β - (3, 5-di-tert-butyl-4-hydroxyphenyl) isooctyl propionate, 2,6, 6-tetramethyl-4-piperidine stearate, distearyl pentaerythritol diphosphite, poly (dipropylene glycol) phenyl phosphite and o-acetylsalicylic acid are added into the emulsifying and stirring kettle according to 1 part by mass, 1-2 parts by mass and 1-2 parts by mass, respectively.
7. The dyeing process of the regenerated polyester yarn as claimed in claim 5, wherein the added urea and the added lauryl alcohol polyvinyl ether are respectively 0.5 part by mass and 1 part by mass.
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