阅读说明：本技术 一种涤纶梭织布免复练染色方法 (Re-scouring-free dyeing method for polyester woven fabric ) 是由 金鲜花 洪言情 项宝军 王兰 张洁 王浩然 于 2020-12-28 设计创作，主要内容包括：本发明公开了一种涤纶梭织布免复练染色方法。本发明的方法包括以下步骤：a、退浆织物直接进缸,并加入适量的水；b、将免复练助剂缓慢加入到机缸中,并运行一段时间；c、将配置的染液过滤入缸,进行高温高压染色；d、还原清洗；e、水洗。本发明解决平幅退浆织物直接进缸染色易产生浆斑、色花、缸差等问题,并能提高染厂染色的一次成功率,缩短工艺流程,提高生产效率。(The invention discloses a rehearsal-free dyeing method for polyester woven fabric. The method of the invention comprises the following steps: a. directly feeding the desized fabric into a cylinder, and adding a proper amount of water; b. slowly adding the re-refining-free auxiliary agent into the machine cylinder, and operating for a period of time; c. filtering the prepared dye solution into a vat, and dyeing at high temperature and high pressure; d. reduction cleaning; e. and (5) washing with water. The invention solves the problems of easy generation of slurry spots, color spots, cylinder difference and the like when the open-width desized fabric is directly fed into the cylinder for dyeing, and can improve the one-time success rate of dyeing in a dye factory, shorten the process flow and improve the production efficiency.)

1. The rehicle-free dyeing method of the polyester woven fabric is characterized by comprising the following steps of:

s1: after open width desizing of the polyester woven fabric, directly feeding the polyester woven fabric into a machine cylinder, and adding water at a bath ratio of 1:3-1: 20;

s2: slowly adding the re-refining-free auxiliary agent into the machine cylinder, operating for a period of time after the material is added, fully neutralizing residual alkali, and dispersing cloth cover slurry and impurities;

s3: adding a proper amount of dye liquor of disperse dye, dyeing at 50 ℃, slowly heating to 120 ℃ and 130 ℃, and preserving heat for 30-90min to ensure that the dye is completely dyed on the fiber;

s4: slowly cooling the dye liquor to 70-80 ℃, adding 1-3g/L of acid reduction cleaning agent, preserving the temperature for 15-20min, and removing the surface flooding of the fabric;

s5: and washing the dyed fabric with water to finish the whole process.

2. The rehearsal-free dyeing method for the polyester woven fabric according to claim 1, which is characterized in that: in the step S2, the running time is 8-12 min.

3. The rehearsal-free dyeing method for the polyester woven fabric according to claim 1, which is characterized in that: in step S2, the operation time is 10 min.

4. The rehearsal-free dyeing method for the polyester woven fabric according to claim 1, which is characterized in that: the dosage of the non-refinishing auxiliary agent is 1-5 g/L.

5. The rehearsal-free dyeing method for the polyester woven fabric according to claim 1, which is characterized in that: when processing high-count and high-density fabrics, the dosage of the non-refinishing auxiliary agent is 4-5 g/L.

6. The rehearsal-free dyeing method for the polyester woven fabric according to claim 1, which is characterized in that: the no-refinishing auxiliary agent is a compound of polyacrylic acid series multipolymer and polyester surfactant, wherein the mass ratio of the polyacrylic acid series multipolymer to the polyester surfactant is 1-3: 1.

7. The rehearsal-free dyeing method for polyester woven fabric according to claim 6, characterized in that: the polyacrylic acid series multipolymer is prepared by the following method: adding maleic anhydride and a nonionic surfactant into a container, introducing nitrogen, heating to 70-75 ℃, melting and stirring uniformly, then adjusting the reaction temperature to 90-130 ℃, reacting for 1-3h, after the reaction product is cooled to room temperature, adding acrylic acid and water, controlling the reaction temperature to 70-80 ℃, then dropwise adding an initiator, and reacting for 20-40min to prepare an acrylic multipolymer;

the raw materials are calculated according to the weight unit as follows: 20-30% of maleic anhydride and 70-80% of nonionic surfactant, wherein the total amount of the raw materials is 100 parts; the amount of the initiator is 2.0-7.0 parts, the amount of the acrylic acid is 300-600 parts and the amount of the water is 300-600 parts.

8. The rehearsal-free dyeing method for polyester woven fabric according to claim 7, characterized in that: the nonionic surfactant is preferably one or any combination of the following compounds: styryl phenol polyoxyethylene ether, cardanol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether; the initiator is persulfate or a water-soluble azo initiator.

9. The rehearsal-free dyeing method for polyester woven fabric according to claim 6, characterized in that: the polyester surfactant is prepared by the following method: uniformly stirring the dibasic acid, the dihydric alcohol and the catalyst, heating to 190 ℃ and 210 ℃, and reacting for 2-4 h; then adding polyether or polyol, continuing to react for 2-4h, and cooling to obtain a polyester surfactant;

the raw materials are calculated according to the weight unit as follows: 65-75% of dibasic acid, 20-30% of dihydric alcohol and 5% of catalyst, wherein the total amount of the raw materials is regarded as 100 parts, and 250-400 parts of polyether or polyhydric alcohol.

10. The rehearsal-free dyeing method for polyester woven fabric according to claim 9, characterized in that: the dibasic acid is one or any combination of the following compounds: terephthalic acid, isophthalic acid, 2-methyl terephthalic acid, 2, 6-naphthalene dicarboxylic acid;

the dihydric alcohol is one or any combination of the following compounds: ethylene glycol, 1, 4-butanediol, 1, 6-hexanediol, cyclohexanediol, bisphenol a;

the catalyst is tetrabutyl titanate or butyl stannoic acid;

the polyether or the polyalcohol is one or any combination of the following compounds: polyethylene glycol, polyethylene glycol monomethyl ether, sorbitan, and glucose.

Technical Field

The invention belongs to the field of textile printing and dyeing, and relates to a rehest-free dyeing method for polyester woven fabric.

Background

The polyester woven fabric does not contain natural impurities, and the fabric mainly contains sizing agent applied in the spinning and weaving process and a small amount of oil stains and dust stained in the transportation and storage processes. In order to remove sizing agent and other impurities on the fabric, the polyester woven fabric is generally treated by two processes of machine cylinder desizing (intermittent) and width desizing (continuous). The fabric subjected to open width desizing keeps better fracture and tearing strength, the fabric feels plump, the cylinder desizing treatment time is longer, the energy consumption is higher, the pollution is heavier, the domestic environmental protection policy and the advocation of energy conservation and emission reduction are not met, the traditional cylinder desizing is gradually replaced by the open width desizing, and the open width desizing is rapidly popularized in printing and dyeing enterprises.

The pretreatment is an important process for determining the dyeing quality of textiles, although the open width desizing process has the advantages of avoiding mechanical abrasion of fabrics, high production efficiency and less pollution discharge, the open width process hardly meets the requirements of desizing efficiency and white refining product quality, and impurities such as sizing agent, alkaline agent, oligomer and the like can still remain on the cloth surface. The sizing agent and the oligomer are separated out again in the acid dyeing process and are condensed under the high-temperature condition, which may cause the phenomena of sizing stains and color spots in the dyeing process. In addition, the residual alkaline agent can cause large pH fluctuation of the dye liquor and the cloth surface, and cause the problem of poor dyeing reproducibility. Therefore, in order to reduce the number of reworking operations, increase the one-time success rate of dyeing, and remove impurities such as sizing agent, alkaline agent, and oligomer remaining after open-width desizing, a re-scouring process is generally required to be added before dyeing. However, the repeated use of water, electricity, steam and auxiliaries will undoubtedly increase the cost of printing and dyeing, which is contrary to the current trend of the year-by-year decline of the dyeing cost of printing and dyeing factories.

Disclosure of Invention

Aiming at the defects of the open width desizing process, the invention provides the requing-free dyeing method of the polyester woven fabric, which is characterized in that the effect of the requing-free process is achieved by adding the requing-free auxiliary agent into a bath before dyeing, so that the processing process is shortened, the production efficiency is improved, the production cost is reduced, the environmental pollution is reduced, the occurrence probability of pulp spots, color spots and cylinder difference can be reduced, and the one-time success rate of dyeing in a dye factory is improved.

In order to achieve the purpose, the invention provides the following technical scheme: a rehearsal-free dyeing method for polyester woven fabric comprises the following steps:

s1: after open width desizing of the polyester woven fabric, directly feeding the polyester woven fabric into a machine cylinder, and adding water at a bath ratio of 1:3-1: 20;

s2: slowly adding the re-refining-free auxiliary agent into a machine cylinder, operating for a period of time after the material is added, fully neutralizing residual alkali, and dispersing impurities such as cloth cover slurry, oligomer and the like;

s3: adding a proper amount of dye liquor of disperse dye, dyeing at 50 ℃, slowly heating to 120 ℃ and 130 ℃, and preserving heat for 30-90min to ensure that the dye is completely dyed on the fiber;

s4: slowly cooling the dye liquor to 70-80 ℃, adding 1-3g/L of acid reduction cleaning agent, preserving the temperature for 15-20min, and removing the surface flooding of the fabric;

s5: and washing the dyed fabric with water to finish the whole process.

Further, in the step S2, the operation time is 8-12 min.

Further, in step S2, the operation time is 10 min.

Furthermore, the dosage of the non-refinishing auxiliary agent is 1-5 g/L.

Furthermore, when high-count and high-density fabrics are processed, the dosage of the non-rewarding auxiliary agent is 4-5 g/L.

In order to ensure the dyeing reproducibility, the pH value of the dye bath and the cloth cover in the dyeing process is preferably slightly fluctuated in a weak acid range (the pH value is about 4.5), and the scouring-free auxiliary agent is required to have excellent pH value buffering performance.

During the high-temperature high-pressure dyeing process, a small amount of oligomer contained in the polyester fiber is easy to diffuse to the surface of the fiber, enters into the dyeing solution, is aggregated with dye, fiber scraps and the like to form sticky substances, and finally is attached to the polyester fabric to form color spots and color spots, namely so-called tar spots. In order to prevent color defects caused by oligomers, it is also necessary that the non-rewarding aid has solubilizing and dispersing effects on the oligomers.

Further, the no-repeated-scouring auxiliary agent is a compound of polyacrylic acid series multipolymer and polyester surfactant, wherein the mass ratio of the polyacrylic acid series multipolymer to the polyester surfactant is 1-3: 1.

Further, the polyacrylic acid series multipolymer is prepared by the following method: adding maleic anhydride and a nonionic surfactant into a container, introducing nitrogen, heating to 70-75 ℃, melting and stirring uniformly, then adjusting the reaction temperature to 90-130 ℃, reacting for 1-3h, after the reaction product is cooled to room temperature, adding acrylic acid and water, controlling the reaction temperature to 70-80 ℃, then dropwise adding an initiator, and reacting for 20-40min to prepare an acrylic multipolymer;

the raw materials are calculated according to the weight unit as follows: 20-30% of maleic anhydride and 70-80% of nonionic surfactant, wherein the total amount of the raw materials is 100 parts; the amount of the initiator is 2.0-7.0 parts, the amount of the acrylic acid is 300-600 parts and the amount of the water is 300-600 parts.

According to the invention, the nonionic surfactant is introduced into the acrylic copolymer, so that the acrylic copolymer has amphipathy of the nonionic surfactant, and the compounding performance of the acrylic copolymer is improved. In addition, the hydrophobic group in the nonionic surfactant can be used as an anchoring group of the polyester fiber and has good binding force with the fiber, and the synthesized acrylic acid multipolymer can be quickly adsorbed to the surface of the fiber when being added into the working solution, can effectively neutralize residual alkali on the fabric, has good pH buffering capacity and ensures that the pH of the dye solution is 4.5-5. The component also has the performances of chelation, dispersion and solubilization, can obviously improve the high-temperature dispersibility of disperse dyes and sizing agents, and reduces the occurrence probability of sizing stains, color spots and dye vat contamination.

The molecular structural formula of the acrylic multipolymer is as follows:

in the formula, R₁、R₂Is a group obtained by substituting a hydrogen group with a nonionic surfactant.

Still further, the nonionic surfactant is preferably one or any combination of the following compounds: styryl phenol polyoxyethylene ether, cardanol polyoxyethylene ether and isomeric tridecanol polyoxyethylene ether; the initiator is persulfate or a water-soluble azo initiator.

Further, the polyester surfactant is prepared by the following method: uniformly stirring the dibasic acid, the dihydric alcohol and the catalyst, heating to 190 ℃ and 210 ℃, and reacting for 2-4 h; then adding polyether or polyalcohol, continuing to react for 2-4h, and cooling to obtain a polyester surfactant, wherein the polyether or polyalcohol is used as a hydrophilic group;

the raw materials are calculated according to the weight unit as follows: 65-75% of dibasic acid, 20-30% of dihydric alcohol and 5% of catalyst, wherein the total amount of the raw materials is regarded as 100 parts, and 250-400 parts of polyether or polyhydric alcohol.

The polyester surfactant has a similar structure to the oligomer, can be easily adsorbed on the oligomer, can help the oligomer to be solubilized and dispersed, has a good anti-coagulation effect on the oligomer, prevents the oligomer from forming sticky substances with dyes, fiber scraps and the like, reduces or even eliminates the probability of tar spots, and improves the one-time success rate of dyeing.

The molecular structural formula of the polyester surfactant is as follows:

wherein n is 5 to 20.

Still further, the dibasic acid is one or any combination of the following compounds: terephthalic acid, isophthalic acid, 2-methyl terephthalic acid, 2, 6-naphthalene dicarboxylic acid;

the dihydric alcohol is one or any combination of the following compounds: ethylene glycol, 1, 4-butanediol, 1, 6-hexanediol, cyclohexanediol, bisphenol a;

the catalyst is tetrabutyl titanate or butyl stannoic acid;

the polyether or the polyalcohol is one or any combination of the following compounds: polyethylene glycol, polyethylene glycol monomethyl ether, sorbitan, and glucose.

Compared with the prior art, the invention has the following beneficial effects: the method can reduce the probability of occurrence of the sizing spot, the color spot, the cylinder difference and the like, improve the one-time success rate of dyeing in a dye house, greatly shorten the processing technology, improve the production efficiency, save the energy, reduce the environmental pollution and meet the basic requirements of the industry.

Drawings

FIG. 1 is a graph of temperature rise during dyeing in accordance with an embodiment of the present invention;

FIG. 2 is a diagram of the specific formulation and process for practicing the present invention.

Detailed Description

The following examples are merely preferred embodiments of the present invention. Any simple modification, equivalent change and modification made to the following embodiments in accordance with the technical spirit of the present invention fall within the scope of the present invention.

Example 1: the repeated-scouring-free dyeing method of the polyester woven fabric comprises the following steps:

s1: after 500kg of cation Chuanshan open width desizing, directly feeding into a vat, and adding water, wherein the bath ratio is 1: 10;

s2: slowly adding 5kg of non-rewashing auxiliary agent into the machine cylinder, operating for 10min after the addition is finished, fully diluting the non-rewashing auxiliary agent, fully neutralizing residual alkali, and dispersing impurities such as cloth sizing agent, oligomer and the like, wherein the non-rewashing auxiliary agent is a 1:1 (mass ratio) compound of polyacrylic acid series multi-component copolymer and polyester surfactant.

S3: 5kg of disperse brilliant blue 2BLM is dissolved in warm water, and the mixture is added into a machine cylinder for high-temperature high-pressure dyeing, wherein the dyeing temperature rise curve is shown in figure 1.

S4: adding 2g/L acid reducing cleaning agent, keeping the temperature for 15-20min, and removing the surface flooding of the fabric;

s5: and washing the dyed fabric with cold water to finish the whole process.

Example 2: the repeated-scouring-free dyeing method of the polyester woven fabric comprises the following steps:

s1: after 600kg of polyester taffeta is subjected to open-width desizing, the polyester taffeta directly enters a cylinder, and water is added, wherein the bath ratio is 1: 8.

S2: slowly adding 6kg of the non-rewashing auxiliary agent into the machine cylinder, operating for 10min after the addition is finished, fully diluting the non-rewashing auxiliary agent, fully neutralizing residual alkali, and dispersing impurities such as cloth sizing agent, oligomer and the like, wherein the non-rewashing auxiliary agent is a 3:1 (mass ratio) compound of polyacrylic acid series multi-component copolymer and polyester surfactant.

S3: 8kg of disperse turquoise blue S-GL is melted in warm water and added into a machine cylinder for high-temperature high-pressure dyeing, and the dyeing temperature rise curve is shown in the following figure 1.

S4: adding 3g/L acid reducing cleaning agent, keeping the temperature for 15-20min, and removing the surface flooding of the fabric;

s5: and washing the dyed fabric with cold water to finish the whole process.

Example 3: the repeated-scouring-free dyeing method of the polyester woven fabric comprises the following steps:

s1: 500kg of Mixiding is desized in an open width mode, and then is directly put into a jar, and water is added, wherein the bath ratio is 1: 10.

S2: slowly adding 8kg of the no-recoiling auxiliary agent into a machine cylinder, operating for 10min after the addition is finished, fully diluting the no-recoiling auxiliary agent, fully neutralizing residual alkali, and dispersing impurities such as cloth sizing agent, oligomer and the like, wherein the no-recoiling auxiliary agent is a 2:1 (mass ratio) compound of polyacrylic acid series multi-component copolymer and polyester surfactant.

S3: 5kg of the delphinidin S-GL is melted in warm water and added into a machine cylinder for high-temperature high-pressure dyeing, and the dyeing temperature rise curve is shown in figure 1.

S4: adding 3g/L acid reducing cleaning agent, keeping the temperature for 15-20min, and removing the surface flooding of the fabric;

s5: and washing the dyed fabric with cold water to finish the whole process.

Comparative example 1: the method for dyeing the polyester woven fabric without repeated scouring is different from the method in the embodiment 1 in that the step S2 is not included. S3 was supplemented with glacial acetic acid (pH of the dye solution was adjusted to about 4.5), 1kg/L leveling agent and 2kg/L ammonium sulfate, the other contents being the same as those in example 1.

Comparative example 2: the difference between the polyester woven fabric non-rewriteable dyeing method and the polyester woven fabric in the embodiment 2 is that the step S2 is not included. S3 was supplemented with glacial acetic acid (pH of the dye solution was adjusted to about 4.5), 1kg/L leveling agent and 2kg/L ammonium sulfate, the remainder being identical to example 2.

Comparative example 3: the difference between the polyester woven fabric non-rewriteable dyeing method and the polyester woven fabric in the embodiment 3 is that the step S2 is not included. S3 was supplemented with glacial acetic acid (pH of the dye solution was adjusted to about 4.5), 1kg/L leveling agent and 2kg/L ammonium sulfate, the remainder being identical to example 3.

Comparative example 4: the difference between the dyeing method of the polyester woven fabric and the dyeing method of the polyester woven fabric in the embodiment 1 is that the step S2 is not included, and the re-scouring process is carried out before the fabric is put into a cylinder, and the specific formula and the process are shown in figure 2. S3 was supplemented with glacial acetic acid (pH of the dye solution was adjusted to about 4.5), 1kg/L leveling agent and 2kg/L ammonium sulfate, the other contents being the same as those in example 1.

Comparative example 5: the difference between the dyeing method of the polyester woven fabric and the dyeing method of the polyester woven fabric in the embodiment 2 is that the step S2 is not included, and the re-scouring process is carried out before the fabric is put into a cylinder, and the specific formula and the process are shown in figure 2. S3 was supplemented with glacial acetic acid (pH of the dye solution was adjusted to about 4.5), 1kg/L leveling agent and 2kg/L ammonium sulfate, the remainder being identical to example 2.

Comparative example 6: the difference between the dyeing method of the polyester woven fabric and the dyeing method of the polyester woven fabric in the embodiment 3 is that the step S2 is not included, and the re-scouring process is carried out before the fabric is put into a cylinder, and the specific formula and the process are shown in figure 2. S3 was supplemented with glacial acetic acid (pH of the dye solution was adjusted to about 4.5), 1kg/L leveling agent and 2kg/L ammonium sulfate, the remainder being identical to example 3.

To more clearly illustrate the effect of the method of the present invention, the dyeing method of each of examples 1, 2, and 3 was selected to be compared with comparative examples 1, 2, 3, 4, 5, and 6, and the difference between the two was evaluated, and the results are shown in the following table.

TABLE 1 comparison of cost and efficiency of the present invention with conventional processes

As can be seen from the table, the once-through success rate of the dyeing of the examples 1, 2 and 3 is obviously higher than that of the comparative examples 1, 2 and 3, which shows that the addition of the non-rewarding auxiliary agent is helpful for improving the once-through success rate of the dyeing and reducing the rework times of the dye house. In addition, compared with comparative examples 4, 5 and 6, the results show that the water, electricity and steam consumption in the examples 1, 2 and 3 are obviously reduced, the process flow is shortened, the environmental pollution is reduced, the production cost of a dye factory is greatly reduced, and the method has great significance for the energy conservation and emission reduction targets of the textile printing and dyeing industry.