Polyester fabric dyeing method

Abstract

The invention relates to a polyester fabric dyeing method which comprises the following steps: firstly, pretreating a polyester fabric, namely desizing, bleaching and heat setting; putting the pretreated polyester fabric into a dye vat at room temperature, heating, adding an alkaline leveling agent, a color fixing agent, a disperse dye and a pH regulator into the dye vat, heating, and keeping the temperature; cooling and discharging liquid in the dye vat; deionized water is added into the dye vat, the polyester fabric is washed with water, and the washed polyester fabric is subjected to softening treatment, tentering setting and antistatic treatment; and finally, carrying out secondary washing on the polyester fabric. The alkaline leveling agent, the color fixing agent, the disperse dye and the pH regulator are added in the dyeing process, so that the dye fully permeates into the fiber, and the dyeing uniformity is effectively improved; meanwhile, an environment-friendly color fixing agent is adopted, so that potential hazards to the environment and human bodies are reduced; after dyeing is completed, the polyester fabric is subjected to secondary washing, chemical substances remaining on the polyester fabric are removed, and the safety of the polyester fabric is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fabric dyeing, and particularly relates to a polyester fabric dyeing method. BACKGROUND

[0002] As one of the largest synthetic fibers, polyester has many advantages, such as easy availability of raw materials, durability, good elasticity, corrosion resistance, good light resistance, easy washing and quick drying, and high cost performance. These characteristics make polyester fabric widely used in many fields such as clothing, home textiles and industrial textiles. In the dyeing process of polyester fabric, it is necessary to operate under high temperature and high pressure conditions, and the problems of small dyeing batch, large bath ratio, high labor intensity and large consumption are obvious. This is seriously deviated from the current goals of environmental protection and sustainability. Improving the dyeing percentage, but the carrier is easy to remain on the fabric or fiber, usually in the form of color spots and color spots, almost impossible to remove, even if the dark color is also difficult to cover up, thus forming defects. SUMMARY

[0003] The technical problem solved by the present application is to provide a polyester fabric dyeing method to solve the problems in the above background.

[0004] The technical problem solved by the present application is solved by the following technical scheme: A polyester fabric dyeing method, the specific steps are as follows: 1) Pretreatment The polyester fabric is pretreated, and the pretreatment includes desizing, bleaching and heat setting; 2) Dyeing The pretreated polyester fabric is placed in a dyeing vat at room temperature, then heated to 65-69 DEG C at a rate of 2.3-2.4 DEG C / min, and then the dyeing vat is added with an alkaline leveling agent, a fixing agent, a disperse dye and a pH regulator, and then heated to 105 DEG C at a rate of 1.2-1.25 DEG C / min, and then kept for 17 min, and then heated to 135-137 DEG C at a rate of 2.8 DEG C / min, and then kept for 25-27 min; then cooled to 70 DEG C, and then the liquid is discharged; the bath ratio is 1:5; the concentration of the disperse dye is 0.82% owf, and the concentration of the alkaline leveling agent is 0.75 g / L; the pH of the dyeing solution is 9.9-10.2; 3) Washing Deionized water is added to the dyeing vat, and the polyester fabric is washed for 13-15 min; 4) Post-treatment The washed polyester fabric is subjected to softness treatment, tentering and antistatic treatment; 5) Second washing After the post-treatment in step 4) is completed, the polyester fabric is washed again to remove the chemicals remaining on the polyester fabric, ensuring the safety and quality of the polyester fabric.

[0005] In the present application, in step 2), the fixing agent is an environmentally friendly fixing agent, which is soaked in warm water at 40-45°C for 3-5 min before being added to the dyeing vat; the fixing agent remains in the dyeing process for more than 15 min to ensure that the fixing agent fully penetrates into the fibers. Advantages

[0006] In the present application, the addition of the alkaline leveling agent, the fixing agent, the disperse dye, and the pH regulator in the dyeing process allows the dye to fully penetrate into the fibers, effectively improving the dyeing uniformity; at the same time, the use of the environmentally friendly fixing agent reduces the potential harm of traditional fixing agents to the environment and the human body; after the dyeing is completed, the polyester fabric is washed again to remove the chemicals remaining on the polyester fabric, ensuring the safety and quality of the polyester fabric. DETAILED DESCRIPTION

[0007] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described in conjunction with specific embodiments. EMBODIMENTS

[0008] A polyester fabric dyeing method, the specific steps are as follows: 1) Pretreatment The polyester fabric is pretreated, which includes desizing, bleaching, and heat setting; 2) Dyeing The pretreated polyester fabric is placed in a dyeing vat at room temperature, then heated to 65°C at a rate of 2.3°C / min, and the alkaline leveling agent, the fixing agent, the disperse dye, and the pH regulator are added to the dyeing vat, then heated to 105°C at a rate of 1.2°C / min, kept for 17 min, then heated to 135°C at a rate of 2.8°C / min, kept for 25 min; then cooled to 70°C, and the liquid is discharged; the bath ratio is 1:5; the concentration of the disperse dye is 0.82% owf, and the concentration of the alkaline leveling agent is 0.75 g / L; the pH of the dyeing solution is 9.9; 3) Washing Deionized water is added to the dyeing vat to wash the polyester fabric, and the washing time is 13 min; 4) Post-treatment The washed polyester fabric is subjected to softness treatment, tentering, and antistatic treatment; 5) Second washing After the post-treatment in step 4) is completed, the polyester fabric is washed again to remove the chemicals remaining on the polyester fabric, ensuring the safety and quality of the polyester fabric. Embodiment

[0009] A polyester fabric dyeing method, the specific steps are as follows: 1) Pretreatment The polyester fabric is pretreated, and the pretreatment includes desizing, bleaching and heat setting; 2) Dyeing The pretreated polyester fabric is placed in a dyeing vat at room temperature, then heated to 67 DEG C at a rate of 2.4 DEG C / min, and then alkaline leveling agent, color fixing agent, disperse dye and pH regulator are added into the dyeing vat, and then heated to 105 DEG C at a rate of 1.25 DEG C / min, and then kept for 17 min, and then heated to 137 DEG C at a rate of 2.8 DEG C / min, and then kept for 27 min, and then cooled to 70 DEG C, and then the liquid is discharged; the bath ratio is 1:5; the concentration of disperse dye is 0.82% owf, and the concentration of alkaline leveling agent is 0.75 g / L; the pH of the dyeing solution is 10; 3) Washing Deionized water is added into the dyeing vat, and the polyester fabric is washed for 15 min; 4) Post-treatment The washed polyester fabric is subjected to softness treatment, tentering and antistatic treatment; 5) Secondary washing After the post-treatment in step 4) is completed, the polyester fabric is subjected to secondary washing to remove the chemical substances remaining on the polyester fabric, so as to ensure the safety and quality of the polyester fabric. Embodiment

[0010] A polyester fabric dyeing method, the specific steps are as follows: 1) Pretreatment The polyester fabric is pretreated, and the pretreatment includes desizing, bleaching and heat setting; 2) Dyeing The pretreated polyester fabric is placed in a dyeing vat at room temperature, then heated to 69 DEG C at a rate of 2.4 DEG C / min, and then alkaline leveling agent, color fixing agent, disperse dye and pH regulator are added into the dyeing vat, and then heated to 105 DEG C at a rate of 1.25 DEG C / min, and then kept for 17 min, and then heated to 137 DEG C at a rate of 2.8 DEG C / min, and then kept for 27 min, and then cooled to 70 DEG C, and then the liquid is discharged; the bath ratio is 1:5; the concentration of disperse dye is 0.82% owf, and the concentration of alkaline leveling agent is 0.75 g / L; the pH of the dyeing solution is 10.2; 3) Washing Deionized water is added into the dyeing vat, and the polyester fabric is washed for 15 min; 4) Post-treatment The washed polyester fabric is subjected to softness treatment, tentering and antistatic treatment; 5) Secondary washing After the post-treatment in step 4) is completed, the polyester fabric is washed again to remove the chemicals remaining on the polyester fabric, ensuring the safety and quality of the polyester fabric.

[0011] In Examples 1-3, in step 2), the fixing agent is an environmentally friendly fixing agent, which is dissolved by soaking in warm water at 40-45°C for 3-5 min before being added to the dyeing vat; the fixing agent remains in the dyeing process for more than 15 min to ensure that the fixing agent penetrates into the fibers.

[0012] The polyester fabric dyed in Examples 1-3 is tested for performance, and the color fastness to washing is determined according to GB / T3921-2008, and the color fastness to rubbing is determined according to GB / T3920-2008, both of which are within the measurement standard range.

[0013] In the description of the present application, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0014] At the same time, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0015] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

Claims

1. A method for dyeing polyester fabric, characterized in that, The specific steps are as follows: 1) Preprocessing Polyester fabrics are pretreated, including desizing, bleaching and heat setting. 2) Staining The pretreated polyester fabric was placed in a dyeing vat at room temperature, and then the temperature was increased to 65℃~69℃ at a rate of 2.3~2.4℃ / min. Alkaline leveling agent, fixing agent, disperse dye, and pH adjuster were added to the dyeing vat. The temperature was then increased to 105℃ at a rate of 1.2~1.25℃ / min and held for 17 min. The temperature was then increased to 135℃~137℃ at a rate of 2.8℃ / min and held for 25~27 min. The temperature was then lowered to 70℃ and the liquid was drained. The concentration of disperse dye was 0.82% owf, the concentration of alkaline leveling agent was 0.75 g / L, and the pH of the dyeing solution was 9.9~10.

2. 3) Wash with water Add deionized water to the dyeing vat and wash the polyester fabric. 4) Post-processing The washed polyester fabric undergoes softening treatment, stretching and shaping, and antistatic treatment. 5) Secondary water washing After the post-processing in step 4) is completed, the polyester fabric is washed a second time.

2. The method for dyeing polyester fabric according to claim 1, characterized in that, In step 2), the liquor ratio is 1:

5.

3. The method for dyeing polyester fabric according to claim 1, characterized in that, In step 2), the fixing agent is an environmentally friendly fixing agent.

4. The method for dyeing polyester fabric according to claim 3, characterized in that, Before adding the color-fixing agent to the dyeing vat, soak it in warm water at 40℃~45℃ for 3~5 minutes.

5. The method for dyeing polyester fabric according to claim 1, characterized in that, In step 3), the water washing time is 13-15 minutes.