A dyeing method for aramid fabric using an environmentally friendly carrier and its application

Abstract

The invention relates to the technical field of aramid dyeing carriers, and in particular to a dyeing method for aramid fabric using an environmentally friendly carrier and application thereof. The method comprises the following steps: 1, preparing the environmentally friendly carrier: mixing a certain proportion of a phenyl acrylic acid compound and an amino acid ester compound, and ultrasonically oscillating the mixture for a certain period of time using an ultrasonic cleaning machine to form a uniformly mixed composite solution; 2, pre-treating the fabric: treating the mixture for 10 minutes under the conditions of a degreasing agent of 3 g / L, a temperature of 90° C., and a bath ratio of 1:25, and then fully washing the mixture with water; 3, preparing a cationic dye dyeing solution: the dyeing solution comprises: a carrier mass concentration of 5-50 g / L, 0.5-6% (owf) of cationic red X-GRL, 15-90 g / L of electrolyte, a pH value of 3-9, a dyeing temperature of 90° C. to 140° C., and a heat preservation time of 30-100 min; and 4, soaping: treating the mixture in a soap solution containing 2 g / L of standard soap flakes, 2 g / L of Na2CO3, and a temperature of 90° C. for 10 minutes, and then fully washing the mixture with water. The dyeing method of the invention is simple, can effectively improve the dyeing effect of aramid fabric, has no irritating odor, is low in toxicity, and can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of aramid dyeing carriers, in particular to a dyeing method for aramid fabrics using an environmentally friendly carrier and application thereof. Background Art

[0002] As the application of aramid fiber becomes more and more extensive, while taking advantage of the excellent properties of aramid fiber, it is necessary to make it have a variety of colors to meet diversified application scenarios. However, since the chemical structure of aramid fiber is very stable and its glass transition temperature and crystallinity are also high, aramid dyeing is relatively difficult.

[0003] Currently, dyeing methods for aramid mainly include high-temperature and high-pressure dyeing, chemical modification dyeing, and carrier dyeing. The high-temperature and high-pressure dyeing method requires high temperatures and pressures. While this can improve dyeing results to a certain extent, it places high demands on equipment and results in very high energy consumption and environmental pollution. The chemical modification dyeing method chemically modifies the aramid to increase the number of dye binding sites, allowing more dye to bind to the fiber, but this method can damage the fiber. Carrier dyeing is a commonly used method both domestically and internationally. The carrier in this method is an organic compound that plasticizes and expands the fiber, promoting dye dissolution and increasing dye uptake. The carrier has a low relative molecular mass and an affinity for the fiber, allowing it to quickly penetrate the fiber, causing it to plasticize and expand.

[0004] However, most aramid dyeing carriers have problems such as unpleasant odor, toxicity, and difficulty in removal, posing potential hazards to the environment and human health. To meet environmental protection requirements and reduce adverse environmental impacts, it is necessary to develop an environmentally friendly aramid dyeing carrier that is odorless, low in toxicity, and recyclable. Summary of the Invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a dyeing method and application of an environmentally friendly carrier for aramid fabrics. The dyeing method is simple, can effectively improve the dyeing effect of aramid fabrics, and has no irritating odor, low toxicity, and is recyclable.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A method for dyeing aramid fabric using an environmentally friendly carrier comprises the following steps:

[0008] Step 1, preparation of an environmentally friendly carrier: a certain proportion of a phenyl acrylic acid compound and an amino acid ester compound are mixed, and ultrasonically vibrated in an ultrasonic cleaning machine for a certain period of time to form a uniformly mixed composite solution;

[0009] Step 2, fabric pretreatment: degreasing agent 3g / L, temperature 90℃, bath ratio 1:25, treatment for 10 minutes and then fully washed;

[0010] Step 3, prepare cationic dye dyeing solution: carrier mass concentration 5-50g / L, cationic red X-GRL 0.5-6% (owf), electrolyte (dyeing accelerator) 15-90g / L, pH value 3-9, dyeing temperature 90°C-140°C, holding time 30-100min;

[0011] Step 4, soap washing: after dyeing, treat in a soap solution of 2g / L standard soap flakes, 2g / L Na2CO3, and a temperature of 90°C for 10 minutes and then rinse thoroughly with water.

[0012] Preferably, in step 1, the phenyl acrylic acid compound is any one of 3-phenyl-2-acrylic acid, 3-phenyl-2-acrylic acid methyl ester, and 3-(4-hydroxy-3-methoxyphenyl)-2-acrylic acid.

[0013] Preferably, in step 1, the amino acid ester compound is any one of 3-(N-n-butyl-N-acetyl)-aminopropionic acid ethyl ester, 3-(N-n-propyl-N-acetyl)-aminopropionic acid ethyl ester, 3-(N-n-pentyl-N-acetyl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-formyl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-propionyl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-butyryl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-acetyl)-aminopropionic acid methyl ester, and 3-(N-n-butyl-N-acetyl)-aminopropionic acid isopropyl ester.

[0014] Preferably, in step 1, the mass ratio of the phenyl acrylic acid compound to the amino acid ester compound is 1:(1-20).

[0015] Preferably, in step 1, the ultrasonic cleaning machine ultrasonic time is 5-50 minutes.

[0016] Preferably, in step 3, the electrolyte (dyeing accelerator) is any one of sodium chloride, sodium sulfate, and sodium nitrate.

[0017] The present invention also provides a recycling application of the environmentally friendly carrier in the dyeing method in dyeing aramid fabric with cationic dyes.

[0018] Preferably, the cationic dye is any one of cationic dye red X-GRL, cationic dye red 6B, cationic dye red X-5GN, cationic dye yellow X-10GFF, cationic dye yellow X-GL, cationic dye blue X-GB, and cationic dye blue X-BL.

[0019] The environmentally friendly carrier is also suitable for dyeing aramid with disperse dyes; the environmentally friendly carrier is also suitable for dyeing aramid fibers. The aramid fibers that the environmentally friendly carrier is used to dye include para-aramid and meta-aramid.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The environmentally friendly dyeing carrier of the present invention is compounded from a phenyl acrylic acid compound and an amino acid ester compound. These phenyl acrylic acid compounds are widely found in natural plants and have a slight fragrance. They are widely used in the fields of medicine, cosmetics, and food additives. They not only do not cause serious harm to human health, but are also easily degraded by microorganisms, reducing their accumulation and potential harm in the environment. The amino acid ester compound used is odorless and can be used as an efficient and safe mosquito repellent. It has many applications in cosmetics and has the advantages of no toxic side effects on the skin and mucous membranes, no allergic reaction, and no skin permeability, making it very safe to use. The compound of the phenyl acrylic acid compound and the amino acid ester compound ensures the low toxicity of the dyeing carrier, does not produce unpleasant or irritating odors, reduces harm to the human body and the environment, and is easily removed from fabrics under appropriate washing conditions.

[0022] 2. The environmentally friendly dyeing carrier of the present invention does not require a complex emulsification process. The compound can be prepared by ultrasonication for several minutes. The operation is simple, and no specialized equipment or complex operation techniques are required, which is convenient for promotion and application. The compound solution is relatively stable, has a long storage time, is easy to use, and does not have demulsification or stratification. This ensures the consistency of the dyeing process and the stability of the dyeing effect, thereby improving the dyeing quality.

[0023] 3. The environmentally friendly dyeing carrier of the present invention is used for dyeing aramid fabrics, significantly improving the dyeing performance of aramid fabrics. The environmentally friendly carrier of the present invention can be recycled up to five times with minimal changes in color depth and dye uptake, and a color difference ΔE fluctuation range of less than 1. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a photo of the dyed fabric according to Example 1 of the present invention;

[0025] Figure 2 This is a photo of the dyed fabric according to Example 2 of the present invention;

[0026] Figure 3 This is a photo of the dyed fabric according to Example 3 of the present invention;

[0027] Figure 4 This is a photo of the dyed fabric of Comparative Example 1 of the present invention;

[0028] Figure 5 This is a photo of the dyed fabric of Comparative Example 2 of the present invention;

[0029] Figure 6 This is a photo of the dyed fabric of Comparative Example 3 of the present invention;

[0030] Figure 7 This is a photo of the dyed fabric of Comparative Example 4 of the present invention;

[0031] Figure 8 This is a physical picture of the dye cup after dyeing in Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings so that those skilled in the art can better understand the advantages and features of the present invention and thus more clearly define the scope of protection of the present invention. The embodiments described in the present invention are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative work shall fall within the scope of protection of the present invention.

[0033] Example 1:

[0034] A method for dyeing aramid fabric using an environmentally friendly carrier comprises the following steps:

[0035] S1) Preparation of an environmentally friendly carrier: 3-phenyl-2-propenoic acid and 3-(N-n-butyl-N-acetyl)-aminopropionic acid ethyl ester were mixed in a mass ratio of 1:4 and ultrasonically shaken in an ultrasonic cleaning machine for 8 minutes to form a uniformly mixed composite solution.

[0036] S2) Fabric pretreatment: Degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly rinsed;

[0037] S3) preparing a cationic dye solution: carrier concentration 25 g / L, cationic red X-GRL 2% (owf), sodium chloride 60 g / L, pH 5, dyeing temperature 130° C., and holding time 60 min;

[0038] S4) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0039] Example 2:

[0040] A method for dyeing aramid fabric using an environmentally friendly carrier comprises the following steps:

[0041] S1) Preparation of an environmentally friendly carrier: 3-phenyl-2-methyl acrylate and 3-(N-n-propyl-N-acetyl)-aminopropionic acid ethyl ester were mixed in a mass ratio of 3:7 and ultrasonically shaken in an ultrasonic cleaning machine for 10 minutes to form a uniformly mixed composite solution.

[0042] S2) Fabric pretreatment: Degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly rinsed.

[0043] S3) preparing a cationic dye solution: carrier concentration 30 g / L, cationic red X-GRL 2% (owf), sodium sulfate 40 g / L, pH 5, dyeing temperature 130° C., and holding time 60 min;

[0044] S4) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0045] Example 3:

[0046] A method for dyeing aramid fabric using an environmentally friendly carrier comprises the following steps:

[0047] S1) Preparation of an environmentally friendly carrier: 3-(4-hydroxy-3-methoxyphenyl)-2-propenoic acid and 3-(N-n-butyl-N-propionyl)-aminopropionic acid ethyl ester were mixed in a mass ratio of 1:4 and ultrasonically shaken in an ultrasonic cleaning machine for 10 minutes to form a uniformly mixed composite solution.

[0048] S2) Fabric pretreatment: Degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly rinsed;

[0049] S3) preparing a cationic dye solution: carrier concentration 30 g / L, cationic red X-GRL 2% (owf), sodium nitrate 20 g / L, pH 5, dyeing temperature 130° C., and holding time 50 min;

[0050] S4) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0051] Comparative Example 1:

[0052] A dyeing method for aramid fabric comprises the following steps:

[0053] S1) Fabric pretreatment: degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly washed;

[0054] S2) preparing a cationic dye solution: cationic red X-GRL 2% (owf), sodium chloride 60 g / L, pH 5, dyeing temperature 130° C., and holding time 60 min;

[0055] S3) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0056] Comparative Example 2:

[0057] A method for dyeing aramid fabric using a carrier comprises the following steps:

[0058] S1) dye carrier: 3-phenyl-2-propenoic acid;

[0059] S2) Fabric pretreatment: Degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly rinsed;

[0060] S3) preparing a cationic dye solution: carrier concentration 25 g / L, cationic red X-GRL 2% (owf), sodium chloride 60 g / L, pH 5, dyeing temperature 130° C., and holding time 60 min;

[0061] S4) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0062] Comparative Example 3:

[0063] A method for dyeing aramid fabric using a carrier comprises the following steps:

[0064] S1) dye carrier: 3-(N-butyl-N-acetyl)-aminopropionic acid ethyl ester;

[0065] S2) Fabric pretreatment: Degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly rinsed;

[0066] S3) preparing a cationic dye solution: carrier concentration 25 g / L, cationic red X-GRL 2% (owf), sodium chloride 60 g / L, pH 5, dyeing temperature 130° C., and holding time 60 min;

[0067] S4) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0068] Comparative Example 4:

[0069] A method for dyeing aramid fabric using a carrier comprises the following steps:

[0070] S1) Dyeing carrier: wintergreen oil emulsion;

[0071] S2) Fabric pretreatment: Degreasing agent 3g / L, temperature 90°C, bath ratio 1:25, treatment for 10 minutes, and then thoroughly rinsed;

[0072] S3) preparing a cationic dye solution: carrier concentration 25 g / L, cationic red X-GRL 2% (owf), sodium chloride 60 g / L, pH 5, dyeing temperature 130° C., and holding time 60 min;

[0073] S4) Soap washing: After dyeing, the dye was treated in a soap solution containing 2 g / L soap flakes, 2 g / L Na2CO3, a bath ratio of 1:25, and a temperature of 90°C for 10 minutes, and then thoroughly washed with water.

[0074] Color fastness to rubbing and color fastness to washing with soap were determined according to GB / T3920-2008, "Textiles—Tests for Color Fastness—Color Fastness to Rubbing," and GB / T3921-2008, "Textiles—Tests for Color Fastness—Color Fastness to Washing with Soap." The apparent depth (K / S value) of the dyed fabric samples was measured using a DATA COLOR650 colorimeter. The data are shown in Table 1.

[0075] Table 1

[0076]

[0077] As can be seen from the above table, the dyeing carrier of the present invention has a good dyeing effect on aramid fabric dyeing. Comparative Example 1 is the dyeing effect without adding a dyeing carrier. By comparing Examples 1-3, it can be seen that the use of the environmentally friendly dyeing carrier of the present invention to dye aramid fabric greatly improves the color depth of the dyed fabric, and various color fastnesses are excellent. Comparative Example 2 uses 3-phenyl-2-acrylic acid as a dyeing carrier. Although the color depth of the fabric after dyeing can reach 27.5, 3-phenyl-2-acrylic acid is a crystalline powder with a high melting point and is very water-soluble. There is uneven dyeing in the fabric after dyeing, and the fabric is stiff, and the color fastness is relatively low. In addition, there are many attachments that are very difficult to clean on the dye cup. Comparative Example 3 uses only 3-(N-n-butyl-N-acetyl)-ethyl aminopropionate as a dyeing carrier. The color depth of the dyed fabric can also reach 23.1, but is 5-6 lower than the color depth of the fabric after dyeing using a composite carrier. Therefore, by mixing the composite carrier obtained by mixing phenyl acrylic acid compounds with amino acid ester compounds, not only the dyeing effect is improved, but also the problem of using phenyl acrylic acid compounds to dye alone is solved. Comparative Example 4 is a traditional dyeing carrier, which needs to be emulsified into an emulsion before it can be used. Its dyeing effect is not as good as the environmentally friendly dyeing carrier of the present invention and has an unpleasant irritating odor. In addition, its emulsification process and emulsion stability must be considered. In comparison, the environmentally friendly dyeing carrier of the present invention improves the dyeing effect while being safe and environmentally friendly and easy to prepare and use.

[0078] Cyclic dyeing test:

[0079] Aramid 1313 fabric was dyed using the method of Example 1. After dyeing, the fabric was removed and soaked in hot water at 70-98°C with stirring to remove the carrier. The remaining liquid was then returned to the remaining solution, which was then placed in an oven to evaporate a certain amount of water. In subsequent dyeing cycles, the remaining solution was replenished to the dye concentration and pH of the initial dye solution. After each dyeing cycle, the fabric was tested for dye uptake, K / S ratio, and other chromaticity values. The results are shown in Table 2.

[0080] Table 2

[0081] Reuse times K / S value Dye uptake CIE L CIE a CIE b ΔE 1 22.42 98.99％ 44.02 55.11 16.89 -- 2 22.43 98.92％ 44.29 55.24 16.93 0.30 3 22.14 98.15％ 44.10 54.96 16.26 0.65 4 21.79 97.27％ 43.81 54.78 16.13 0.85 5 21.17 96.58％ 44.38 55.85 17.35 0.94

[0082] As shown in Table 2, after five cycles of dyeing, the color characteristic values ​​of the dye carrier remained very similar, with the color difference ΔE fluctuating within a range of less than 1, a range that is difficult to discern with the naked eye. Furthermore, the K / S values ​​and various color characteristic values ​​of the fabrics remained essentially consistent over the five cycles. The reuse of this self-made, environmentally friendly carrier in cyclic dyeing not only conserves dye carrier and inorganic salts, but also reduces dyeing costs and wastewater discharge, resulting in excellent economic and environmental benefits.

[0083] In summary, the present invention can significantly improve the dyeing performance of aramid fabrics when used for dyeing. The environmentally friendly carrier of the present invention can be recycled 5 times with little change in color depth and dye uptake, and a color difference ΔE fluctuation range of less than 1.

[0084] The descriptions and practices disclosed in this invention are easy for those skilled in the art to understand and comprehend, and modifications and refinements may be made without departing from the principles of the invention. Therefore, modifications and improvements made without departing from the spirit of the invention should also be considered within the scope of protection of this invention.

Claims

1. A method for dyeing aramid fabric using an environmentally friendly carrier, characterized in that: The steps include: Step 1, preparation of an environmentally friendly carrier: a certain proportion of a phenyl acrylic acid compound and an amino acid ester compound are mixed, and ultrasonically vibrated in an ultrasonic cleaning machine for a certain period of time to form a uniformly mixed composite solution; Step 2, fabric pretreatment: degreasing agent 3g / L, temperature 90℃, bath ratio 1:25, treatment for 10 minutes and then fully washed; Step 3, prepare cationic dye dyeing solution: carrier mass concentration 5-50g / L, cationic red X-GRL 0.5-6% (owf), electrolyte 15-90g / L, pH 3-9, dyeing temperature 90°C-140°C, holding time 30-100min; Step 4, soap washing: after dyeing, treat in a soap solution of 2g / L standard soap flakes, 2g / L Na2CO3, and a temperature of 90°C for 10 minutes and then rinse thoroughly with water.

2. The method for dyeing aramid fabric using an environmentally friendly carrier according to claim 1, characterized in that: In step 1, the phenyl acrylic acid compound is any one of 3-phenyl-2-acrylic acid, 3-phenyl-2-acrylic acid methyl ester, and 3-(4-hydroxy-3-methoxyphenyl)-2-acrylic acid.

3. The method for dyeing aramid fabric using an environmentally friendly carrier according to claim 1, characterized in that: In step 1, the amino acid ester compound is any one of 3-(N-n-butyl-N-acetyl)-aminopropionic acid ethyl ester, 3-(N-n-propyl-N-acetyl)-aminopropionic acid ethyl ester, 3-(N-n-pentyl-N-acetyl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-formyl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-propionyl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-butyryl)-aminopropionic acid ethyl ester, 3-(N-n-butyl-N-acetyl)-aminopropionic acid methyl ester, and 3-(N-n-butyl-N-acetyl)-aminopropionic acid isopropyl ester.

4. The method for dyeing aramid fabric using an environmentally friendly carrier according to claim 1, characterized in that: In step 1, the mass ratio of the phenyl acrylic acid compound to the amino acid ester compound is 1:(1-20).

5. The method for dyeing aramid fabric using an environmentally friendly carrier according to claim 1, characterized in that: In step 1, the ultrasonic cleaning time of the ultrasonic cleaning machine is 5-50 minutes.

6. The method for dyeing aramid fabric using an environmentally friendly carrier according to claim 1, characterized in that: In step 3, the electrolyte is any one of sodium chloride, sodium sulfate, and sodium nitrate.

7. A cyclic use of the environmentally friendly carrier in the dyeing method according to any one of claims 1 to 6 in dyeing aramid fabric with cationic dyes.

8. The use according to claim 7, characterized in that The cationic dye is any one of cationic dye red X-GRL, cationic dye red 6B, cationic dye red X-5GN, cationic dye yellow X-10GFF, cationic dye yellow X-GL, cationic dye blue X-GB, and cationic dye blue X-BL.

9. The use according to claim 7, characterized in that The environmentally friendly carrier is used for dyeing aramid fibers including para-aramid and meta-aramid.

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