Short process dyeing process for polyester mesh fabric

Abstract

The present invention relates to the field of dyeing and finishing technology, and specifically discloses a short-process dyeing process for polyester mesh fabric, which includes the following steps: S1. Degreasing and dyeing in one bath: Add dyeing acid, dispersing migration agent, disperse dye, and degreasing agent into the dyeing vat in the same bath, feed the fabric and water, then heat up to 70±2°C and keep it running at a constant temperature for 4-6 minutes, and then slowly heat up to 135±2°C and keep it running at a constant temperature for 30±5 minutes; S2. Acidic reduction cleaning: After dyeing, cool down to 82-85°C, add the acidic reducing agent thiourea dioxide and glacial acetic acid into the dyeing vat, and keep it running at a constant temperature for 20-30 minutes; S3. Hot washing, water washing, and discharging the fabric. The present invention processes degreasing and dyeing in one bath, innovatively selects the dispersing migration agent PS-10 and the emulsifying degreasing agent CW liq, and these two chemicals cooperate with each other to achieve the same bath, realizing short-range dyeing. The dyeing effect is good, the color uptake rate is high, there is no back adhesion, and the capillary effect is good. On the premise of ensuring the quality, the heating rate can be increased, and excellent color fastness performance can be obtained.

Description

Technical Field

[0001] The present invention relates to the field of dyeing and finishing technology, and particularly to a short process dyeing process for polyester mesh fabric. Background Art

[0002] Polyester mesh fabric is made by weaving polyester filaments into a mesh fabric, which has a wide range of applications. For example, as a shoe upper, it requires good levelness and high color fastness during dyeing. However, the existing dyeing process for polyester mesh fabric has a long processing cycle, large amounts of auxiliaries and water consumption. Especially to obtain high color fastness, caustic soda and sodium hydrosulfite are preferably used in the industry, and multiple water washes and acid washes are required. The traditional degreasing agent (fatty alcohol polyoxyethylene ether + water + isopropanol) has poor emulsifying effect and the oligomers will stick back, which is also not conducive to one-bath dyeing; in addition, the traditional leveling agent has poor migration property and a large dosage. In order to ensure uniform coloring, only the heating rate can be slowed down, which is time-consuming, energy-consuming and increases the probability of color streaks. Summary of the Invention

[0003] The object of the present invention is to provide a short process dyeing process for polyester mesh fabric, which can shorten the process while ensuring excellent color fastness.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A short process dyeing process for polyester mesh fabric, comprising the following steps:

[0006] S1. Degreasing and dyeing in one bath: Add dyeing acid, dispersing and migrating agent, disperse dye, and emulsifying degreasing agent into the dyeing vat in one bath, feed the fabric and water, then heat up to 70°C ± 2°C and keep it running for 4 - 6 min, and then slowly heat up to 135°C ± 2°C and keep it running for 30 min ± 5 min;

[0007] S2. Acidic reduction cleaning: After dyeing, cool down to 82°C - 85°C, add acidic reducing agent thiourea dioxide and glacial acetic acid into the dyeing vat, and keep it running for 20 - 30 min;

[0008] S3. Hot wash, water wash, and take out the fabric.

[0009] Preferably, the bath ratio in steps S1 and S3 is both 1:6.

[0010] Preferably, the dispersing and migrating agent in step S1 is dispersing and migrating agent PS-10.

[0011] Preferably, the emulsifying degreasing agent in step S1 is emulsifier CW liq.

[0012] Preferably, the disperse dye adopts the Annoqi PUD-SD series.

[0013] Preferably, in the step S1, the dosage of the dyeing acid is 1 ± 0.2 g / L, the dosage of the disperse migration agent is 0.5 ± 0.1%, and the dosage of the degreasing agent is 1 ± 0.2%.

[0014] Preferably, in the step S2, the dosage of the acidic reducing agent is 2 ± 0.2%, and the dosage of glacial acetic acid is 0.5 ± 0.1 g / L.

[0015] Preferably, in the step S1, the heating rate for heating to 70°C ± 2°C is 2 ± 0.2 °C / min, the heating rate for heating to 135°C ± 2°C in the step S1 is 1.5 ± 0.1 °C / min, and the cooling rate for cooling to 82°C - 85°C in the step S2 is 1.5 ± 0.1 °C / min.

[0016] Preferably, both the hot washing and the water washing adopt double-in and double-out, overflow water washing, and are respectively washed for 10 ± 2 min.

[0017] Preferably, the end point of the acidic reduction cleaning is controlled by the color fastness to organic solvents not less than grade 4.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention performs the degreasing and dyeing in one bath, and innovatively selects the disperse migration agent PS-10 and the emulsifying degreasing agent CWliq. The main components of the emulsifying degreasing agent CW liq are ethoxylated fatty alcohol and (1-hydroxyethylidene) diphosphonic acid. These two chemicals cooperate with each other to achieve the same bath, without sticking back, and with good capillary effect. On the premise of ensuring the quality, the heating rate can be increased, short-range dyeing can be realized, the dyeing effect is good, the coloring rate is high, and excellent color fastness performance can be obtained. In the reduction cleaning step of the present invention, thiourea dioxide is used. Thiourea dioxide is weakly acidic, and there is no need for multiple water washing and pickling operations. Coupled with the double-in and double-out of the inlet and outlet water, the inlet and drainage time is shortened, the water washing efficiency is increased, the water washing time is shortened, the fabric surface is cleaner faster, and the color fixing can be achieved without additional addition of sodium dithionite treatment, saving water, time, and having good fastness, which is beneficial to shortening the dyeing cycle; in addition, due to the use of acidic reduction cleaning, the good mechanical properties of the mesh fabric can be maintained, and the damage to polyester fibers caused by hot alkali can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the process curve diagram of Examples 1-2 and Comparative Example 2 of the present invention.

[0021] Figure 2 It is the pretreatment-dyeing process curve diagram of Comparative Example 1 of the present invention.

[0022] Figure 3 It is the reduction cleaning process curve diagram of Comparative Example 1 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Example 1

[0024] This example provides a short - process dyeing process for polyester mesh fabric, which includes the following steps:

[0025] S1. Degreasing and dyeing in one bath: Add 1 g / L of dyeing acid, 0.5% of dispersing and migrating agent PS - 10, 0.06% of disperse deep red PUD - SD, 0.16% of disperse orange PUD - SD, 0.95% of disperse navy blue PUD - SD, and 1% of emulsifying degreasing agent CW liq into the dyeing vat. Feed the fabric and water, with a bath ratio of 1:6. Then heat up to 70°C at a rate of 2°C / min and keep it running for 4 - 6 min, and then slowly heat up to 135°C at a rate of 1.5°C / min and keep it running for 30 min;

[0026] S2. Acidic reduction cleaning: After dyeing, cool down to 85°C at a rate of 1.5°C / min. Add 2% of acidic reducing agent thiourea dioxide (supplied by Sichuan Chengxin Chemical Technology Co., Ltd., with a purity of 99.8%) and 0.5 g / L of glacial acetic acid into the dyeing vat, and keep it running for 20 min. The end point of acidic reduction cleaning is controlled by the color fastness to organic solvents not less than grade 4;

[0027] S3. Hot washing, water washing, and discharging the fabric. Double - inlet and double - row, overflow water washing, with a bath ratio of 1:6, each for 10 min.

[0028] The process duration is only about 3.5 hours.

[0029] Example 2

[0030] This example provides a short - process dyeing process for polyester mesh fabric, which includes the following steps:

[0031] S1. Degreasing and dyeing in one bath: Add 1 g / L of dyeing acid, 0.5% of dispersing and migrating agent PS - 10, 1.5% of disperse scarlet PUD - SD, 0.056% of disperse deep red PUD - SD, and 1% of emulsifying degreasing agent CW liq into the dyeing vat. Feed the fabric and water, with a bath ratio of 1:6. Then heat up to 70°C at a rate of 2°C / min and keep it running for 4 - 6 min, and then slowly heat up to 135°C at a rate of 1.5°C / min and keep it running for 30 min;

[0032] S2. Acidic reduction cleaning: After dyeing, cool down to 85°C at a rate of 1.5°C / min. Add 2% of acidic reducing agent thiourea dioxide (supplied by Sichuan Chengxin Chemical Technology Co., Ltd., with a purity of 99.8%) and 0.5 g / L of glacial acetic acid into the dyeing vat, and keep it running for 20 min. The end point of acidic reduction cleaning is controlled by the color fastness to organic solvents not less than grade 4;

[0033] S3. Hot wash and water wash, then take out the cloth. Double-in and double-out, overflow water wash, bath ratio is 1:6, wash for 10 minutes respectively.

[0034] The process duration is only about 3.5 hours.

[0035] Comparative Example 1

[0036] This comparative example provides a dyeing process for polyester mesh fabric, which specifically includes the following steps:

[0037] S1. Feed water and cloth, bath ratio 1:8, add 2% of soap oil NX-2284, heat up to 80°C at 3°C / min and keep warm for 10 minutes, then drain the water;

[0038] S2. Bath ratio 1:8, after washing with water at room temperature for 5 minutes, add 1 g / L of dyeing acid, 1% of leveling agent DM-2115A, 1.5% of disperse red PUD-SD, 0.056% of disperse dark red PUD-SD, heat up to 80°C at 2°C / min and keep warm for 5 minutes, then heat up to 120°C at 1.5°C / min and keep warm for 5 minutes, then heat up to 130°C at 1.5°C / min and keep warm for 40 minutes, and finally heat up to 70°C at 2°C / min, feed water, wash the cloth, and drain the water;

[0039] S3. Feed water, add 3% of caustic soda flakes, heat up to 70°C at 2°C / min, then add 4% of sodium hydrosulfite within 10 minutes, keep warm for 30 minutes and then drain the water;

[0040] S4. Feed water and wash the cloth twice, then acid wash at 70°C for 10 minutes, drain the water, wash with cold water once and then drain the water, and take out the cloth.

[0041] The process time is up to about 6.5 hours.

[0042] Comparative Example 2

[0043] The difference between this comparative example and Example 2 above is only the additives used. The dyeing chemicals in step S1 of this comparative example are: 1 g / L of dyeing acid, 1% of leveling agent DM-2115A, 1.5% of disperse red PUD-SD, 0.056% of disperse dark red PUD-SD, 2% of soap oil NX-2284; step S2 is 3% of acid reducing agent NX-164H and 0.5 g / L of glacial acetic acid.

[0044] Take the polyester mesh fabrics of Examples 1-2 and Comparative Examples 1-2 respectively, perform the same setting treatment on a 165°C setting machine, and then take the mesh fabrics for color fastness testing. The results are as follows.

[0045]

[0046] The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of the present invention claimed is defined by the appended claims and their equivalents.

Claims

1. Short process dyeing process for polyester mesh fabric, Characterized in that: It includes the following steps: S1. Degreasing and dyeing in one bath: Add dyeing acid, dispersing migration agent PS-10, disperse dye, and emulsifying degreasing agent CW liq into the dyeing vat in the same bath, feed the fabric and water, then heat up to 70°C ± 2°C at a heating rate of 2 ± 0.2°C / min and keep it running for 4 - 6 min, and then slowly heat up to 135°C ± 2°C at a heating rate of 1.5 ± 0.1°C / min and keep it running for 30 min ± 5 min; S2. Acidic reduction cleaning: After dyeing, cool down to 82°C - 85°C, add thiourea dioxide and glacial acetic acid as acidic reducing agents into the dyeing vat, and keep it running for 20 min - 30 min; S3. Hot wash, water wash, and take out the fabric. Both the hot wash and water wash adopt double-in and double-out, overflow water washing, and wash for 10 ± 2 min respectively; The main components of the emulsifying degreasing agent CW liq are ethoxylated fatty alcohol and (1-hydroxyethylidene) diphosphonic acid.

2. The short process dyeing process for polyester mesh fabric according to claim 1, Characterized in that: The bath ratio in steps S1 and S3 is both 1∶6.

3. The short process dyeing process for polyester mesh fabric according to claim 1, Characterized in that: The disperse dye adopts the Aenuoqi PUD-SD series.

4. The short process dyeing process for polyester mesh fabric according to claim 1, Characterized in that: In step S1, the dosage of dyeing acid is 1 ± 0.2 g / L, the dosage of dispersing migration agent PS-10 is 0.5 ± 0.1%, and the dosage of emulsifying degreasing agent CW liq is 1 ± 0.2%.

5. The short process dyeing process for polyester mesh fabric according to claim 1, Characterized in that: In step S2, the dosage of acidic reducing agent is 2 ± 0.2%, and the dosage of glacial acetic acid is 0.5 ± 0.1 g / L.

6. The short process dyeing process for polyester mesh fabric according to claim 1, Characterized in that: In step S2, the cooling rate for cooling down to 82°C - 85°C is 1.5 ± 0.1°C / min.

7. The short process dyeing process for polyester mesh fabric according to claim 1, Characterized in that: The end point of the acidic reduction cleaning is controlled by the color fastness to organic solvents not less than grade 4.

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