阅读说明：本技术 涤纶节水节能染色方法 (Water-saving and energy-saving dyeing method for terylene ) 是由 不公告发明人 于 2020-12-03 设计创作，主要内容包括：本发明提供了一种涤纶节水节能染色方法,运用于涤纶染色技术领域,其包括：预处理、软碱性染色、皂化染色、固色以及收卷,实现涤纶染色的节水节能过程,达到涤纶染色成本低,环境环保效果好以及染色效率高的突出性优势。(The invention provides a water-saving and energy-saving dyeing method for terylene, which is applied to the technical field of terylene dyeing and comprises the following steps: the method has the advantages that the water-saving and energy-saving process of polyester dyeing is realized by pretreatment, soft alkaline dyeing, saponification dyeing, color fixation and winding, and the outstanding advantages of low polyester dyeing cost, good environment-friendly effect and high dyeing efficiency are achieved.)

1. A water-saving and energy-saving dyeing method for terylene is characterized by comprising the following steps:

pretreating, namely preparing a light alkali solution by using sodium hydroxide, adding a deoiling agent into the light alkali solution to prepare a pretreatment solution, soaking polyester fibers into the pretreatment solution, precipitating for 10-30 min, adding a surfactant and a fiber opening aid into the pretreatment solution, continuously standing and rinsing at a certain temperature, and finally adding an acid solution into the pretreatment solution to adjust the pH to be neutral;

soft alkaline dyeing, namely heating the polyester fibers and pretreatment liquid with neutral PH at 140-160 ℃, adding a chemical buffering agent into the solution, dissolving oligomers of the polyester fibers by the chemical buffering agent, and finally putting the polyester fibers taken out of the pretreatment liquid into pre-configured dye liquid for soft alkaline dyeing reaction;

carrying out saponification dyeing, wherein after 1-2 of soft alkaline dyeing reaction, the polyester fiber is taken out, then an inorganic buffering agent is added into a soap washing solution to enable the pH of the soap washing solution to be 9.5, and finally the polyester fiber is put back into the soap washing solution to saponify the polyester fiber for reduction dyeing, wherein the inorganic buffering agent comprises a bivalent iron double salt;

fixing color, heating and evaporating soap lotion liquid, cleaning the polyester fiber with clear water, and drying to finish color fixing;

and (6) rolling, namely rolling the polyester fiber after color fixation and warehousing.

2. The water-saving and energy-saving dyeing method for the terylene according to claim 1, wherein in the pretreatment solution, 6-7 g/l of sodium hydroxide, 7-8 g/l of a phosphorus-free degreaser, 0.5-1 g/l of a dispersing agent and 120-130 ℃ are adopted, and the acid solution is a formic acid solution with the mass concentration of 3-5 g/l.

3. The water-saving and energy-saving dyeing method for the terylene according to claim 1, wherein the chemical buffering agent is prepared by heating and mixing 10-11 g/l of sodium carbonate, 10-20 g/l of sodium phosphate and 5-6 g/l of sodium perborate, and the pH value is alkaline and is 9.

4. The water-saving and energy-saving dyeing method for the terylene according to claim 1, wherein the inorganic buffer is prepared from tartaric acid or citric acid, ferrous sulfate, a double salt of ferrous iron of triethanolamine, sodium hydroxide and the balance of water.

5. The water-saving and energy-saving dyeing method for the terylene according to claim 4, wherein 3.78g of tartaric acid or 6g of citric acid is dissolved in 50ml of water;

adding triethanolamine (1 ml if the solution is made of tartaric acid, and 1.5ml if the solution is made of citric acid) into the solution after completely dissolving, and stirring thoroughly;

dissolving sodium hydroxide in 50ml of water by adopting another container, and adding 3.09g of tartaric acid or 4.3g of citric acid;

mixing and stirring the two parts of container liquid to prepare the inorganic buffer.

Technical Field

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

Background

Polyester (polyester) fiber, invented in 1941, is an important variety in synthetic fiber; the terylene is fiber prepared by using Purified Terephthalic Acid (PTA) or dimethyl terephthalate (DMT) and ethylene glycol (MEG) as raw materials through esterification or ester exchange and polycondensation, and the fiber is prepared through spinning and post-treatment, has the greatest advantages of good crease resistance and shape retention, is a chemical fiber variety with the largest total processing amount in all textile fibers, develops differentiated varieties, improves the added value of products, improves the economic benefit of enterprises, and is of great importance to the influence on the whole chemical fiber industry; the product differentiation is the development direction of terylene, and Chinese terylene fiber production enterprises develop along the direction. Therefore, the terylene industry has great development potential.

For the existing terylene dyeing technology, the terylene dyeing technology is divided into dyeing and re-dyeing, wherein the dyeing is mainly divided into four steps, namely, (1) disperse dye gradually approaches to a fiber interface along with the flowing of a dyeing solution in the dyeing solution, the property and the state of the disperse dye are basically irrelevant at the stage, dissolved dye molecules and suspended dye particles flow along with the dyeing solution, and the transfer speed is determined by the solution flow rate. (2) Because the surface of the fiber has a dynamic boundary layer which is difficult to flow, when the disperse dye enters the dynamic boundary layer and is close to the fiber interface, the disperse dye is close to the fiber mainly by self diffusion. The transfer speed in this stage is not only related to the solution flow rate, but also to the diffusion speed of the disperse dye, so that the dye molecules in the dissolved state diffuse much faster than the suspension and aggregates, and the solubility and dispersion state of the disperse dye have a large influence on the transfer speed in this stage. (3) After the disperse dyes approach the fiber interface and the molecular force between the disperse dyes is large enough, the disperse dyes are quickly adsorbed by the fiber surface. The transfer rate at this stage is largely determined by the structure and properties of the fiber and dye molecules, and is also related to the properties of the interfacial solution. The solubility and the dispersion state of the dye have great influence, the solubility of the dye is ultrahigh, the effect of dye molecules and fibers is larger, and the adsorption speed is higher. (4) After the disperse dye is adsorbed on the surface of the fiber, a concentration difference or a chemical potential difference between the internal dye and the external dye is generated in the fiber, the dye is diffused into the fiber, and the diffusion speed is mainly determined by the fiber chemistry and the microstructure and is also related to the molecular structure and the concentration of the dye. The content of the fiber amorphous area is high, the pores are large or the free volume content is high, the dye solubility is high, and the diffusion speed is high, so the dye diffusion speed at the stage is directly related to the swelling or plasticizing degree of the fiber and the concentration of the disperse dye in the fiber. The swelling or plasticizing degree is high, the concentration of the disperse dye of the outer layer of the fiber is high, and the diffusion is fast.

The re-dyeing is that the polyester fiber and filament fabric have strong hydrophobicity, and common dyes and dyeing methods can hardly dye and can only dye by using disperse dyes. However, the whole dyeing process is completed under high temperature and high pressure.

It can be understood that the efficient dyeing of the polyester fiber can be realized through the dye-uptake and the re-dyeing, but with the development of technological progress, the environmental awareness of the existing polyester dyeing is higher and higher, various waste water treatment methods are proposed in the prior art, and the method refers to the attached drawing 1 and is a method for treating dyeing and weaving waste water in the prior art;

however, the existing dyeing and weaving wastewater is not water-saving and energy-saving, needs to be added with various microorganisms with good itch and anaerobes for biological reaction, and has high wastewater treatment cost and low efficiency.

Disclosure of Invention

The invention provides a water-saving and energy-saving dyeing method for terylene, which aims to meet the first-level standard in the discharge standard of pollutants for textile dyeing and finishing industry (GB 4287-92), realize the water-saving and energy-saving process of terylene dyeing and achieve the outstanding advantages of low terylene dyeing cost, good environment-friendly effect and high dyeing efficiency.

The invention adopts the following technical means for solving the technical problems:

the invention provides a water-saving and energy-saving dyeing method for terylene, which comprises the following steps:

pretreating, namely preparing a light alkali solution by using sodium hydroxide, adding a deoiling agent into the light alkali solution to prepare a pretreatment solution, soaking polyester fibers into the pretreatment solution, precipitating for 10-30 min, adding a surfactant and a fiber opening aid into the pretreatment solution, continuously standing and rinsing at a certain temperature, and finally adding an acid solution into the pretreatment solution to adjust the pH to be neutral;

soft alkaline dyeing, namely heating the polyester fibers and pretreatment liquid with neutral PH at 140-160 ℃, adding a chemical buffering agent into the solution, dissolving oligomers of the polyester fibers by the chemical buffering agent, and finally putting the polyester fibers taken out of the pretreatment liquid into pre-configured dye liquid for soft alkaline dyeing reaction;

carrying out saponification dyeing, wherein after 1-2 of soft alkaline dyeing reaction, the polyester fiber is taken out, then an inorganic buffering agent is added into a soap washing solution to enable the pH of the soap washing solution to be 9.5, and finally the polyester fiber is put back into the soap washing solution to saponify the polyester fiber for reduction dyeing, wherein the inorganic buffering agent comprises divalent iron double salt and is stirred;

fixing color, heating and evaporating soap lotion liquid, cleaning the polyester fiber with clear water, and drying to finish color fixing;

and (6) rolling, namely rolling the polyester fiber after color fixation and warehousing.

Further, in the pretreatment liquid, 6-7 g/l of sodium hydroxide, 7-8 g/l of a phosphorus-free degreaser, 0.5-1 g/l of a dispersing agent and 120-130 ℃ are used, and the acid solution is a formic acid solution with the mass concentration of 3-5 g/l.

Further, the chemical buffering agent is prepared by heating and mixing 10-11 g/l of sodium carbonate, 10-20 g/l of sodium phosphate and 5-6 g/l of sodium perborate, and the alkaline pH is 9.

Further, the inorganic buffer is prepared from tartaric acid or citric acid, ferrous sulfate, ferrous double salt of triethanolamine, sodium hydroxide and the balance of water.

Further, 3.78g of tartaric acid or 6g of citric acid is dissolved in 50ml of water;

adding triethanolamine (1 ml if the solution is made of tartaric acid, and 1.5ml if the solution is made of citric acid) into the solution after completely dissolving, and stirring thoroughly;

dissolving sodium hydroxide in 50ml of water by adopting another container, and adding 3.09g of tartaric acid or 4.3g of citric acid;

mixing and stirring the two parts of container liquid to prepare the inorganic buffer.

The invention provides a water-saving and energy-saving dyeing method for terylene, which has the following beneficial effects:

the invention provides a water-saving and energy-saving dyeing method for terylene, which comprises the following steps: pretreating, namely preparing a light alkali solution by using sodium hydroxide, adding a deoiling agent into the light alkali solution to prepare a pretreatment solution, soaking polyester fibers into the pretreatment solution, precipitating for 10-30 min, adding a surfactant and a fiber opening aid into the pretreatment solution, continuously standing and rinsing at a certain temperature, and finally adding an acid solution into the pretreatment solution to adjust the pH to be neutral; soft alkaline dyeing, namely heating the polyester fibers and pretreatment liquid with neutral PH at 140-160 ℃, adding a chemical buffering agent into the solution, dissolving oligomers of the polyester fibers by the chemical buffering agent, and finally putting the polyester fibers taken out of the pretreatment liquid into pre-configured dye liquid for soft alkaline dyeing reaction; carrying out saponification dyeing, wherein after 1-2 of soft alkaline dyeing reaction, the polyester fiber is taken out, then an inorganic buffering agent and a proper amount of ferrous complex salt are added into a soap washing solution and stirred, so that the pH value of the soap washing solution is 9.5, and finally the polyester fiber is put back into the soap washing solution to saponify the polyester fiber and carry out reduction dyeing; fixing color, heating and evaporating soap lotion liquid, cleaning the polyester fiber with clear water, and drying to finish color fixing; and (3) rolling and warehousing the polyester fibers after color fixation, so that the polyester fibers meet the primary standard in the discharge standard of pollutants for textile dyeing and finishing industry (GB 4287-92) and the water-saving and energy-saving process of polyester dyeing is realized, and the outstanding advantages of low polyester dyeing cost, good environment-friendly effect and high dyeing efficiency are achieved.

Drawings

FIG. 1 is a wastewater reuse and wastewater treatment method for treating polyester fiber in the prior art;

FIG. 2 is a schematic flow chart of an embodiment of the water-saving and energy-saving dyeing method for terylene according to the invention;

the implementation, functional features and advantages of the present invention will be further described with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to the attached figure 1, the process diagram of the water-saving and energy-saving dyeing method for terylene in one embodiment of the invention is shown;

the application provides a water-saving and energy-saving dyeing method for terylene, which comprises the following steps:

s1, pretreating, namely preparing a light alkali solution by using sodium hydroxide, adding a deoiling agent into the light alkali solution to prepare a pretreatment solution, soaking polyester fibers into the pretreatment solution, precipitating for 10-30 min, then adding a surfactant and an opening aid into the pretreatment solution, continuously standing and rinsing at a certain temperature, and finally adding an acid solution into the pretreatment solution to adjust the pH to be neutral;

s2, soft alkaline dyeing, namely, heating the polyester fibers and the pretreatment solution with neutral PH at 140-160 ℃, adding a chemical buffering agent into the solution, dissolving the oligomer of the polyester fibers through the chemical buffering agent, and finally putting the polyester fibers taken out of the pretreatment solution into pre-prepared dye solution for soft alkaline dyeing reaction;

s3, performing saponification dyeing, performing soft alkaline dyeing reaction for 1-2, taking out the polyester fibers, adding an inorganic buffering agent into a soap washing solution to enable the pH of the soap washing solution to be 9.5, and finally returning the polyester fibers to the soap washing solution to saponify the polyester fibers for reduction dyeing, wherein the inorganic buffering agent comprises ferrous double salt and is stirred;

s4, fixing color, heating and evaporating soap lotion liquid, washing polyester fiber with clear water, and drying to finish color fixing;

and S5, rolling, namely rolling the polyester fiber after color fixation and warehousing.

Specifically, in the pretreatment solution, 6-7 g/l of sodium hydroxide, 7-8 g/l of a phosphorus-free degreaser, 0.5-1 g/l of a dispersing agent and 120-130 ℃ are used, and the acid solution is a formic acid solution with the mass concentration of 3-5 g/l.

The chemical buffering agent is prepared by heating and mixing 10-11 g/l of sodium carbonate, 10-20 g/l of sodium phosphate and 5-6 g/l of sodium perborate, and the pH value is 9.

The inorganic buffer is prepared from tartaric acid or citric acid, ferrous sulfate, ferrous double salt of triethanolamine, sodium hydroxide and the balance of water.

3.78g of tartaric acid or 6g of citric acid is dissolved in 50ml of water;

adding triethanolamine (1 ml if the solution is made of tartaric acid, and 1.5ml if the solution is made of citric acid) into the solution after completely dissolving, and stirring thoroughly;

dissolving sodium hydroxide in 50ml of water by adopting another container, and adding 3.09g of tartaric acid or 4.3g of citric acid;

mixing and stirring the two parts of container liquid to prepare the inorganic buffer.

The chemical buffer used in the novel process provided by the invention has higher stability for disperse dyes, the problem of uneven hooking in pretreatment can be solved through the chemical buffer, the dosage of the traditional Chinese medicine in the prior art is reduced, water and energy are saved, and the polyester fibers are not damaged.

As for the inorganic buffer provided by the invention, experiments show that the existing coordination double salts are all single-ligand double salts, and because ferrous hydroxide is not completely dissolved, the reduction baths of the single-ligand double salts are turbid solutions, and the single-ligand double salts can be used for dyeing and weaving indigo blue, but the dyeing of other colors is not good, so that double-ligand double salts are required.

The inorganic buffer prepared by the preparation process belongs to double-ligand double salt, and tartaric acid or citric acid single-ligand double salt forms weak coordination bonds, so that the double salt is unstable, the divalent iron double salt can be stabilized by adding triethanolamine, and the double-ligand double salt can be prepared into colorless clear reduction bath to realize the maximum dyeing rate on polyester fibers.

This application decomposes the oligomer on the polyester fiber through the soft alkaline chemical buffer of cooperation heating for dye liquid is stronger with polyester fiber's dyeing reaction rate, can reuse dye liquid and pretreatment liquid, fault-tolerant rate when having promoted preparation pretreatment liquid, lifting efficiency.

Improved dyeing efficiency by inorganic buffers.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.