Dyeing process of suede fabric

Abstract

The invention discloses a suede fabric dyeing process which sequentially comprises the following steps: grey cloth pretreatment, alkali decrement, pre-shaping, napping, dyeing, reduction cleaning, sanding, after-finishing and shaping. In the dyeing step, dye is prepared into dye liquor, the dye liquor, a penetrating agent, a non-ionic wetting dispersant, sodium hydrosulfite and acetic acid are conveyed into a dyeing machine, the napped gray fabric is conveyed into the dyeing machine, and then the sodium hydrosulfite is added; the dye liquor comprises a disperse dye, a leveling agent, glycerol and water; in the after-finishing step, the sanded fabric is soaked in an after-finishing treatment solution, and the after-finishing treatment solution comprises hyperbranched polyester, an anti-ultraviolet additive subjected to surface coupling treatment and water. The non-ionic wetting dispersant and the penetrant improve the penetration of the disperse dye to the root of the fluff, and the hyperbranched polyester and the anti-ultraviolet aid are also used in the post-treatment, so that the fabric has higher color fastness, especially color fastness to sunlight.

Description

Technical Field

[0001] The invention relates to a suede fabric dyeing process and belongs to the technical field of fabric dyeing. Background Art

[0002] Suede is a type of suede leather. Since this type of suede leather is made from natural suede after drying, grinding and dyeing, it is named suede. Natural suede has dense hairs, feels soft, smooth, delicate, and has good air permeability and moisture permeability. However, the use of natural suede is limited by production and price. In order to meet the needs of more consumers, the development of suede-like products has become popular in recent years. Polyester ultrafine suede-like fabric is relatively light and thin, and feels good. The specific surface area of ​​ultrafine fibers is large, and the amount of dye used to dye the same color under the same conditions is higher than that of ordinary fibers. How to improve the dye fastness and UV resistance of ultrafine fiber suede fabric has become a problem to be solved. Summary of the invention

[0003] The invention aims to provide a suede fabric dyeing process with good color fastness, especially sunlight fastness.

[0004] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0005] The present invention relates to a suede fabric dyeing process, which comprises the following steps in sequence: grey cloth pretreatment, alkali reduction, pre-setting, napping, dyeing, reduction cleaning, sanding, post-finishing, and setting;

[0006] The grey fabric uses 40D polyester yarn as base yarn, 45D / 144F high F polyester stretch yarn as surface yarn, adopts cotton velvet-like structure, is woven by a 40-needle warp knitting machine, and has a surface density of 200-300 grams per square meter;

[0007] The dyeing process comprises the following steps: firstly preparing the dye into a dye liquor with a bath ratio of 1:15-20; then conveying the dye liquor, a penetrant, a nonionic wetting and dispersing agent, half of the amount of the insurance powder and acetic acid into a dyeing machine, then raising the temperature of the dye liquor to 60°C, then conveying the napped grey cloth into the dyeing machine containing the dye liquor, then heating the dye liquor to 90-95°C, adding another half of the insurance powder, then keeping the temperature for 15-20 minutes, then heating the dye liquor to 115-120°C, keeping the temperature for 60-80 minutes, and finally cooling the dye liquor to 40-45°C before discharging the cloth;

[0008] The dye liquor comprises disperse dye, leveling agent, glycerin and water;

[0009] The post-finishing process is to immerse the sanded fabric in a post-finishing treatment liquid, wherein the post-finishing treatment liquid comprises hyperbranched polyester, an anti-ultraviolet auxiliary agent subjected to surface coupling treatment, and water.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the anti-ultraviolet auxiliary agent is nano zinc oxide and / or nano titanium dioxide.

[0011] On the basis of the above scheme and as a preferred scheme of the above scheme: the CAS No. of the non-ionic wetting and dispersing agent is 64422-66-8, and the leveling agent is Peregal O-25.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: the hyperbranched polyester is a multifunctional intermediate synthesized from maleic anhydride and glycerol as raw materials, and then reacted with pentaerythritol to obtain a hyperbranched hydroxyl-terminated polyester.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: the grey cloth needs to be immersed in a working solution containing a softener, a leveling agent and a swelling agent before being input into the dyeing tank, and a pH regulator is used to adjust the pH of the working solution to 3.5-4.0, and the cloth is rolled to a liquid rate of 50%.

[0014] The beneficial effects of the present invention are as follows: the nonionic wetting and dispersing agent and penetrant used in the suede fabric dyeing process of the present invention improve the penetration of disperse dyes into the roots of the fluff, and the hyperbranched polyester and anti-ultraviolet additives used in the post-treatment make the fabric have higher color fastness, especially color fastness to sunlight. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with specific embodiments.

[0016] Example

[0017] A suede fabric dyeing process involved in this embodiment includes the following steps in sequence: grey cloth pretreatment, alkali reduction, pre-setting, napping, dyeing, reduction cleaning, sanding, post-finishing, and setting.

[0018] The grey cloth adopts 40D polyester yarn as base yarn, 45D / 144F high F polyester stretch yarn as surface yarn, adopts cotton velvet-like structure, is woven by a 40-needle warp knitting machine, and has a surface density of 200-300 grams per square meter.

[0019] Grey cloth pretreatment refers to the degreasing and cleaning of the grey cloth to lay the foundation for subsequent processing.

[0020] Alkali treatment refers to the process of conveying the grey cloth to an alkali weight-reducing machine containing a weight-reducing agent for alkali weight-reducing treatment. The raw materials of the weight-reducing agent include 3 parts of sodium dodecylbenzene sulfonate, 25 parts of caustic soda, 15 parts of Tween 80, 3 parts of silanetriol and 3 parts of disodium succinate in weight-reducing ratio of 1:20. The temperature of the weight-reducing liquid in the alkali weight-reducing machine is controlled at 70°C and the duration is 150 minutes. Finally, the grey cloth after alkali weight-reduction treatment is rinsed twice with clean water.

[0021] Presetting means that the grey cloth after alkali treatment is transported to the drying room for heat drying, and the temperature in the drying room is controlled to 160°C, the duration is 45s, and the speed is 40m / min.

[0022] The dyeing process is to prepare the dye into a dye liquor with a bath ratio of 1:20; then the dye liquor, penetrant, non-ionic wetting and dispersing agent, half of the amount of insurance powder and acetic acid are transported to the dyeing machine, and then the temperature of the dye liquor is increased to 60°C, and then the grey cloth after napping is transported to the dyeing machine containing the dye liquor, and then the dye liquor is heated to 95°C, and another half of the amount of insurance powder is added, and then the temperature is kept for 20 minutes, and then the dye liquor is heated to 120°C, and the temperature is kept for 80 minutes, and finally the dye liquor is cooled to 45°C and the cloth is discharged. The penetrant used is fatty alcohol polyoxyethylene ether. The CAS No. of the non-ionic wetting and dispersing agent is 64422-66-8.

[0023] Furthermore, the amount of the penetrant is 5 g / L, the amount of the nonionic wetting and dispersing agent is 3 g / L, the amount of the hydrosulfur powder is 2 g / L, and the amount of the acetic acid is 2 g / L.

[0024] Furthermore, the dye liquor includes disperse dye, leveling agent, glycerin and water. The leveling agent is Peregal O-25, wherein the amount of disperse dye is 2% owf, the amount of leveling agent is 1 g / L, and the amount of glycerin is 3 g / L.

[0025] The post-finishing is to immerse the sanded fabric in a post-finishing treatment liquid, wherein the post-finishing treatment liquid includes a hyperbranched polyester, an anti-ultraviolet additive that has been surface-coupled and water. The anti-ultraviolet additive is nano zinc oxide and / or nano titanium dioxide. In this embodiment, the anti-ultraviolet additive is a mixture of nano zinc oxide and nano titanium dioxide in a ratio of 1:1.

[0026] Furthermore, the hyperbranched polyester is a multifunctional intermediate synthesized from maleic anhydride and glycerol as raw materials, and then reacted with pentaerythritol to obtain a hyperbranched hydroxyl-terminated polyester.

[0027] Furthermore, the coupling treatment of the anti-ultraviolet additive refers to the treatment of the anti-ultraviolet additive with a coupling agent, and the coupling agent used is a silane coupling agent or a titanate coupling agent. In this embodiment, the titanate selected is isopropyl tri(dioctyl pyrophosphate acyloxy) titanate, which is a commercially available product. 4 parts by mass of titanium dioxide and 1 part by mass of a coupling agent are added to an ethanol solution. Under stirring with a strong agitator, heat in a water bath, gradually raise the temperature to 80°C, and reflux at a constant temperature for 60 minutes. Dry the treated powder in a blast drying oven at a temperature of 67°C. After drying, grind it in a ball mill.

[0028] Furthermore, the grey cloth needs to be immersed in a working solution containing a softener, a leveling agent and an expander before being input into the dyeing vat, and a pH adjuster is used to adjust the pH of the working solution to 3.5-4.0, and the cloth is rolled to a liquid rate of 50%. The softener is sorbitan fatty acid ester. The leveling agent is Pergagar O-25, and the dosage is 1.5 g / L. The expander is DFM, and the dosage is 1 g / L.

[0029] The color fastness of the fabrics prepared in the examples was measured.

[0030]

[0031] The suede fabric prepared by the invention has good sunlight fastness.

[0032] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A suede fabric dyeing process, characterized in that: The process includes the following steps: pre-treatment of grey cloth, alkali reduction, pre-setting, napping, dyeing, reduction cleaning, sanding, post-finishing and setting; The grey fabric uses 40D polyester yarn as base yarn, 45D / 144F high F polyester stretch yarn as surface yarn, adopts cotton velvet-like structure, is woven by a 40-needle warp knitting machine, and has a surface density of 200-300 grams per square meter; The dyeing process comprises the following steps: firstly preparing the dye into a dye liquor with a bath ratio of 1:15-20; then conveying the dye liquor, a penetrant, a nonionic wetting and dispersing agent, half of the amount of the insurance powder and acetic acid into a dyeing machine, then raising the temperature of the dye liquor to 60°C, then conveying the napped grey cloth into the dyeing machine containing the dye liquor, then heating the dye liquor to 90-95°C, adding another half of the insurance powder, then keeping the temperature for 15-20 minutes, then heating the dye liquor to 115-120°C, keeping the temperature for 60-80 minutes, and finally cooling the dye liquor to 40-45°C before discharging the cloth; The dye liquor comprises disperse dye, leveling agent, glycerin and water; The post-finishing process is to immerse the sanded fabric in a post-finishing treatment liquid, wherein the post-finishing treatment liquid comprises hyperbranched polyester, an anti-ultraviolet auxiliary agent subjected to surface coupling treatment, and water.

2. A suede fabric dyeing process according to claim 1, characterized in that: The anti-ultraviolet auxiliary agent is nano zinc oxide and / or nano titanium dioxide.

3. The suede fabric dyeing process according to claim 1, characterized in that: The CAS No. of the nonionic wetting and dispersing agent is 64422-66-8, and the leveling agent is Peregal O-25.

4. The suede fabric dyeing process according to claim 1, characterized in that: The hyperbranched polyester is a multifunctional intermediate synthesized from maleic anhydride and glycerol as raw materials, and then reacted with pentaerythritol to obtain a hyperbranched hydroxyl-terminated polyester.

5. The suede fabric dyeing process according to claim 1, characterized in that: The grey cloth needs to be immersed in a working liquid containing a softener, a leveling agent and a swelling agent before being input into the dyeing vat, and a pH regulator is used to adjust the pH of the working liquid to 3.5-4.0, and the cloth is rolled to a liquid carrying rate of 50%.

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