CN111235908B - Water-saving and energy-saving dyeing method for terylene - Google Patents

Abstract

The invention discloses a water-saving and energy-saving dyeing method for polyester, which comprises the following steps: A. Preparation of a deep eutectic solvent: mix choline chloride, glycerin, and benzyl alcohol in a molar ratio of 1:1:1, and heat in water Stir to obtain a deep eutectic solvent; B, preparation of dye liquor: disperse dyes, DES and water according to the volume ratio, liquor ratio, and then stir evenly to prepare a dye liquor; C, dyeing: add pre-treated dye liquor to the dye liquor Then heat up to 98-100°C at a speed of 1.5-2°C/min, and keep warm for 40-60min for dyeing; D. Post-dyeing treatment: wash the dyed polyester with 60°C hot water first, and then wash it with cold water , drying after dehydration, the method of the present invention has very little water consumption, low dyeing temperature, no need to add dyeing auxiliaries such as dispersants, no reduction cleaning, and the dyeing medium can be reused, which saves water and energy, and can reduce the traditional water consumption. Environmental impact of phase dyeing methods.

Description

Water-saving and energy-saving dyeing method for polyester

technical field

The invention relates to the technical field of water-saving and energy-saving low-temperature dyeing of polyester, in particular to a water-saving and energy-saving dyeing method of polyester.

Background technique

Polyester fiber is a commonly used textile fiber, usually dyed with disperse dyes. Traditional disperse dyeing uses water as the medium, and the dyeing temperature is high. When dyeing, various dyeing auxiliaries must be added to the dyeing bath, and reduction cleaning must be carried out after dyeing. The entire dyeing process consumes a lot of water and chemicals, and the waste water discharged Contains various difficult-to-remove surfactants and unused dyes, which increase the cost of sewage treatment. In order to reduce environmental pollution, people improve the dyeing process on the one hand, hoping to increase the utilization rate of dyes and reduce the use of water and chemical auxiliaries; on the other hand, they are also constantly looking for dyeing media that can replace water, hoping to achieve waterless dyeing . At present, the non-aqueous medium dyeing methods that have been studied more at home and abroad mainly include: vacuum sublimation dye dyeing, supercritical carbon dioxide dyeing and non-aqueous solvent dyeing. Vacuum sublimation dyeing is to sublimate the dye into a gaseous state under high temperature or vacuum conditions, adsorb on the fiber and diffuse into the fiber, and finally complete the dyeing process. This kind of dyeing technology has high requirements on dyes, the sublimation speed of dyes is difficult to control, and it is easy to cause uneven dyeing, and it has high requirements on equipment, which is seriously polluted and difficult to clean. Supercritical carbon dioxide dyeing technology is a non-aqueous medium dyeing method that has been widely concerned by countries in the world in recent years. Although supercritical carbon dioxide dyeing technology has made great progress in dyeing, and some commercial-scale prototypes have appeared, but in polyester A big problem in fiber dyeing is that the oligomers inside the polyester fiber will be transferred to the surface of the fabric and the inner surface of the dyeing equipment, affecting the quality of the dyed fabric and the operating efficiency of the dyeing machine. In addition, supercritical carbon dioxide dyeing requires high-pressure equipment, which has high requirements for operators, and the cost of high-pressure equipment is relatively high. Solvent dyeing has the advantages of high production efficiency, no sewage treatment problem, low energy consumption, etc., and can solve the problem of oligomers in polyester fabric dyeing, and has attracted more and more attention. However, solvent dyeing also has the disadvantages of high cost and troublesome solvent recovery. Considering the influence of solvents on the performance of fibers, dyes and dyed fabrics, as well as health, safety and environment, choosing a suitable dyeing solvent is the key to determine the development of solvent dyeing technology.

Contents of the invention

The object of the present invention is to provide a kind of in order to choline chloride, glycerol, benzyl alcohol deep eutectic solvent instead of water as dyeing medium, dye polyester with disperse dyes at nearly 100 ℃. Choline chloride and glycerol are typical deep eutectic solvents. They are green solvents with great potential. The synthesis process is simple and the price is low. They have been widely used in electrochemistry, catalysis, organic synthesis, dissolution and extraction, and material chemistry. field, and add benzyl alcohol in choline chloride, glycerin, utilize the plasticizing action of benzyl alcohol to polyester, can reduce the dyeing temperature of polyester. Dyeing with choline chloride, glycerin, and benzyl alcohol deep eutectic solvent as the dyeing medium, with very little water consumption, low dyeing temperature, no need to add dyeing auxiliaries such as dispersants, no reduction cleaning, and the dyeing medium can be reused. The polyester water-saving and energy-saving dyeing method can save water and energy, and can reduce the impact of traditional aqueous dyeing methods on the environment, so as to solve the problems raised in the above-mentioned background technology.

In order to achieve the above object, the present invention provides the following technical solutions: a water-saving and energy-saving dyeing method for polyester, comprising the following steps: a water-saving and energy-saving dyeing method for polyester, comprising the following steps:

A, the preparation of deep eutectic solvent: after choline chloride, glycerol, benzyl alcohol are mixed in molar ratio 1: 1: 1, heated and stirred in water makes deep eutectic solvent;

B. Preparation of dyeing solution: disperse dye, DES and water according to the volume ratio, liquor ratio, and then stir evenly to prepare the dyeing solution;

C. Dyeing: add pre-treated polyester to the dyeing solution, then raise the temperature to 98-100°C at a rate of 1.5-2°C/min, and keep it warm for 40-60 minutes for dyeing;

D. Post-dyeing treatment: wash the dyed polyester with 60°C hot water first, then wash with cold water, dehydrate and then dry.

Preferably, according to step A, heat and stir in a water bath at 40°C until a transparent liquid is formed, that is, a deep eutectic solvent is obtained.

Preferably, the disperse dye according to step B is 1-3% (owf), the volume ratio of DES and water is 70-80:30-20, the bath ratio is 20:1, stirred evenly at 40°C, and prepared into a dyeing liquor.

Preferably, the disperse dye according to step B is a low-temperature or medium-temperature disperse dye.

Preferably, the pretreatment according to step C is oil removal, desizing, impurity removal treatment or alkali weight reduction treatment, and the polyester is polyester fiber, knitted fabric, woven fabric, and non-woven fabric.

Preferably, according to step D, the dyed polyester is firstly washed twice with hot water at 60° C., and then washed twice with cold water.

Compared with prior art, the beneficial effect of the present invention is:

The technical solution provided by the present invention uses choline chloride, glycerin, and benzyl alcohol deep eutectic solvent instead of water as the dyeing medium, and uses disperse dyes to dye polyester at nearly 100°C. The method uses very little water and the dyeing temperature is low. There is no need to add dyeing auxiliaries such as dispersants, and no reduction cleaning is required. The dyeing medium can be reused, saving water and energy. It can reduce the impact of traditional aqueous dyeing methods on the environment, and has broad application prospects.

Detailed ways

The following clearly and completely describes the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The present invention provides the following technical solutions: a water-saving and energy-saving dyeing method for polyester, comprising the following steps:

A, the preparation of deep eutectic solvent: after choline chloride, glycerol, benzyl alcohol are mixed in molar ratio 1: 1: 1, heated and stirred in water makes deep eutectic solvent;

B. Preparation of dyeing solution: disperse dye, DES and water according to the volume ratio, liquor ratio, and then stir evenly to prepare the dyeing solution;

C. Dyeing: add pre-treated polyester to the dyeing solution, then raise the temperature to 98-100°C at a rate of 1.5-2°C/min, and keep it warm for 40-60 minutes for dyeing;

D. Post-dyeing treatment: wash the dyed polyester with 60°C hot water first, then wash with cold water, dehydrate and then dry.

After mixing choline chloride, glycerin, and benzyl alcohol in a molar ratio of 1:1:1, heat and stir in a water bath at 40°C until a transparent liquid is formed to obtain a deep eutectic solvent (DES). Disperse dyes 1 to 3 % (owf), disperse dyes are low-temperature or medium-temperature disperse dyes.

Mix DES and water at a volume ratio of 70-80:30-20, bath ratio 20:1, and stir evenly at 40°C to prepare a dye liquor. The polyester fibers, knitted fabrics, woven fabrics, and non-woven fabrics treated by volume treatment are then heated to 98-100°C at a speed of 1.5-2°C/min, and kept warm for 40-60min for dyeing, and then the dyed polyester is first dyed with 60 ℃ hot water wash twice, and then cold water twice, dehydration and drying.

蓝AQE染料，加入到20mL水中分散均匀，然后加入上述配制的DES 80mL，40℃搅拌均匀，配制成100mL染液；C.染色：在染液中加入5g涤纶织物，然后以2℃/min的速度升温至100℃，保温40min进行染色；D.染色后处理：将染色后的涤纶织物先用60℃热水洗两次，再用冷水洗两次，脱水后烘干。测得染色织物的K/S值为3.281，耐摩擦牢度和耐皂洗牢度都达到5级。Embodiment 1: a kind of dyeing method of blue polyester pongee, concrete steps are as follows: A. the preparation of deep eutectic solvent (DES): take by weighing 35g choline chloride, 23g glycerol, 27g benzyl alcohol (each 0.25 mol), after mixing, heat and stir in a water bath at 40°C until a transparent liquid is formed to obtain the deep eutectic solvent;

Add blue AQE dye to 20mL water to disperse evenly, then add 80mL of DES prepared above, stir evenly at 40°C, and prepare 100mL dye liquor; Speed up to 100°C, keep warm for 40min for dyeing; D. Post-dyeing treatment: Wash the dyed polyester fabric twice with 60°C hot water, then twice with cold water, dehydrate and then dry. The measured K/S value of the dyed fabric is 3.281, and the rubbing fastness and soaping fastness both reach grade 5.

Embodiment 2: a kind of dyeing method of red polyester pongee, concrete steps are as follows: A. the preparation of deep eutectic solvent (DES): take by weighing 35g choline chloride, 23g glycerol, 27g benzyl alcohol (each 0.25mol ), after mixing, heat and stir in a water bath at 40°C until a transparent liquid is formed to obtain a deep eutectic solvent; B. Preparation of the dyeing solution: weigh 0.15g of disperse ruby SE-GFL according to the dyeing depth of 3% (owf). Add the dye to 30mL water to disperse evenly, then add 70mL of DES prepared above, stir evenly at 40°C, and prepare 100mL dyeing solution; C. Dyeing: Add 5g polyester fabric to the dyeing solution, and then heat up at a speed of 1.5°C/min Dyeing after dyeing: wash the dyed polyester fabric twice with hot water at 60°C, then twice with cold water, dehydrate and dry. The measured K/S value of the dyed fabric is 8.764, the rubbing fastness is grade 5, and the soaping fastness is grade 4-5.

Embodiment 3: a kind of dyeing method of red polyester pongee, concrete steps are as follows: A. the preparation of deep eutectic solvent (DES): take by weighing 35g choline chloride, 23g glycerol, 27g benzyl alcohol (each 0.25mol ), after mixing, heat and stir in a water bath at 40°C until a transparent liquid is formed to obtain a deep eutectic solvent; B. Preparation of dyeing solution: weigh 0.30g of disperse ruby SE-GFL according to the dyeing depth of 5% (owf) Add the dye to 40mL of water to disperse evenly, then add 60mL of DES prepared above, stir evenly at 40°C, and prepare 100mL of dye liquor; C. Add 5g of polyester fabric to the dye liquor, and then raise the temperature to 100 Dyeing after dyeing: Wash the dyed polyester fabric twice with hot water at 60°C, then twice with cold water, dehydrate and dry. The measured K/S value of the dyed fabric is 14.247, the rubbing fastness is grade 5, and the soaping fastness is grade 3-4.

Embodiment 4: a kind of dyeing method of red polyester pongee, concrete steps are as follows: A. the preparation of deep eutectic solvent (DES): take by weighing 35g choline chloride, 23g glycerol, 27g benzyl alcohol (each 0.25mol ), after mixing, heat and stir in a water bath at 40°C until a transparent liquid is formed to obtain a deep eutectic solvent; B. Preparation of the dyeing solution: weigh 0.45g of disperse ruby SE-GFL according to the dyeing depth of 7% (owf). Add dye to 50mL water to disperse evenly, then add 50mL of DES prepared above, stir evenly at 40°C, and prepare 100mL dye liquor; C. Dyeing: Add 5g polyester fabric to the dye liquor, and then heat up at a speed of 0.5°C/min To 100 ℃, keep warm for 100min for dyeing; D. post-dyeing treatment: wash the dyed polyester fabric twice with 60 ℃ hot water, then wash twice with cold water, dehydrate and dry. The measured K/S value of the dyed fabric is 19.73, the rubbing fastness is grade 5, and the soaping fastness is grade 2-3.

Dyeing material for blue polyester pongee

In summary, the technical solution provided by the present invention uses choline chloride, glycerin, and benzyl alcohol deep eutectic solvent instead of water as the dyeing medium, and uses disperse dyes to dye polyester at nearly 100 ° C. The method uses very little water , low dyeing temperature, no need to add dyeing auxiliaries such as dispersants, no reduction cleaning, dyeing medium can be reused, saving water and energy, can reduce the impact of traditional aqueous dyeing methods on the environment, and has broad application prospects.

Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications and substitutions can be made to these embodiments without departing from the principle and spirit of the present invention. and modifications, the scope of the invention is defined by the appended claims and their equivalents.

Claims (1)

1. A water-saving and energy-saving dyeing method for terylene is characterized in that: the method comprises the following steps:

A. preparation of DES: respectively weighing 0.25mol of choline chloride, glycerol and benzyl alcohol, mixing, heating in a water bath at 40 ℃, and stirring to form a transparent liquid to obtain a eutectic solvent;

B. preparing a dye solution: weighing 0.05g of Yatelong according to the dyeing depth of 1% (owf) ^® Adding blue AQE dye into 20mL of water for uniform dispersion, then adding the prepared DES 80mL, and uniformly stirring at 40 ℃ to prepare 100mL of dye solution;

C. dyeing: adding 5g of polyester fabric into the dye solution, heating to 100 ℃ at the speed of 2 ℃/min, and preserving heat for 40min for dyeing;

D. and (3) dyeing post-treatment: washing the dyed polyester fabric twice with hot water at 60 ℃, then washing twice with cold water, dehydrating and drying;

the K/S value of the dyed fabric is 3.281, and the rubbing fastness and the soaping fastness both reach 5 grades.