Waterproof finishing post-treatment method

Abstract

The invention relates to a finishing and dyeing process technology, in particular to a waterproof finishing post-treatment method which comprises the following steps: a dyed fabric is sequentially subjected to a waterproof setting process, a cleaning process and a setting process, and the cleaning process comprises cleaning under an alkaline condition and an acidic condition in sequence. According to the waterproof finishing post-treatment method, the fabric subjected to waterproof finishing is washed under the alkaline condition, alcohol substances carried by the fluoride-free waterproof agent on the fabric are fully removed, the waterproof effect is improved, then the fabric is washed under the acidic condition, alkaline substances on the fabric are neutralized, secondary baking is conducted, and the waterproof effect is more stable.

Description

Technical Field

[0001] The invention relates to a finishing and dyeing process technology, and in particular to a waterproof finishing post-treatment method. Background Art

[0002] Waterproof fabrics are widely used in various outdoor fabrics. With the development of society and the growth of environmental awareness, traditional fluorine-based waterproofing agents are being replaced by fluorine-free waterproofing agents. Fluorine-free waterproofing agents are green and environmentally friendly, but their waterproofing effect is relatively unstable and easily affected by various objective factors.

[0003] The conventional fluorine-free waterproof finishing process is shown in the Chinese invention patent with application number 202211101027.0: the fluorine-free waterproof agent finishing liquid is immersed in the setting treatment, and the unstable waterproof effect is generally believed to be caused by incomplete cleaning of the fabric after dyeing, or the residual surfactant used in the dyeing process. The traditional solution is: 1. Strengthen the post-dyeing treatment to remove the auxiliaries used in the dyeing process; 2. Increase the waterproof setting temperature, 3. Increase the amount of waterproofing agent. However, the above solutions all have some defects: 1. Removing the auxiliaries used in the dyeing process has limited help in the waterproof effect. In production practice, it is found that even white materials, without using any dyeing auxiliaries in the dyeing and finishing process, also have the problem of unstable waterproof effect; 2. Although increasing the waterproof setting temperature can improve the waterproof effect, it will cause a decrease in fastness; 3. Increasing the amount of waterproofing agent does not help to improve the stability of the waterproof effect, and will increase costs. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a waterproof finishing post-treatment method with high fastness and stable waterproof effect.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a waterproof finishing post-treatment method, comprising the following steps: the dyed fabric is subjected to a waterproof setting process, a cleaning process and a setting process in sequence, and the cleaning process includes cleaning under alkaline conditions and acidic conditions in sequence.

[0006] The beneficial effect of the present invention is that the waterproof post-treatment method of the present invention cleans the waterproof finished fabric under alkaline conditions to fully remove the alcohol substances carried by the fluorine-free waterproof agent on the fabric, thereby improving the waterproof effect, and then cleans the fabric under acidic conditions to neutralize the alkaline substances on the fabric, and performs secondary baking to make the waterproof effect more stable. DETAILED DESCRIPTION

[0007] In order to explain the technical content, achieved objectives and effects of the present invention in detail, the following is an explanation in conjunction with the implementation modes.

[0008] A waterproof finishing post-processing method comprises the following steps: the dyed fabric is sequentially subjected to a waterproof setting process, a cleaning process and a setting process, wherein the cleaning process comprises sequentially cleaning under alkaline conditions and acidic conditions.

[0009] From the above description, it can be seen that the beneficial effect of the present invention is that most of the fluorine-free waterproofing agents on the market have added alcohol substances such as propylene glycol and butylene glycol as stabilizers to improve the stability of the fluorine-free waterproofing agent. These alcohol substances have a high boiling point and are difficult to evaporate completely under the condition of 150~160°C. The alcohol substances remaining on the fabric will affect the waterproof effect and the stability of the waterproof effect due to their hydrophilicity.

[0010] The present invention cleans the waterproofed fabric under alkaline conditions to fully remove the alcohol substances carried by the fluorine-free waterproof agent on the fabric, thereby improving the waterproof effect. Since the fluorine-free waterproof agent is acid-resistant but not alkali-resistant, the waterproof agent cannot arrange the hydrophobic groups of the waterproof agent molecules under alkaline conditions to form a dense waterproof film. Therefore, after cleaning under alkaline conditions, it is necessary to clean and neutralize the alkaline substances on the fabric under acidic conditions to make the fabric neutral and slightly acidic, and the waterproof effect is more stable. After being treated by the process of the present invention, the water-repellent effect of the fabric can be improved by 0.5~1 level, and the anti-siphoning effect can be improved by 10~15mm.

[0011] Furthermore, the temperature of the waterproof setting process is 140-150° C., the machine speed is 20-30 m / min, and the amount of fluorine-free waterproofing agent added is 4-5wt%.

[0012] From the above description, it can be seen that in the waterproof setting process, the fabric is immersed in the waterproof bath liquid and then baked at high temperature for setting, so that the waterproof agent is cross-linked and the hydrophobic groups are arranged outward, which has a good waterproof effect.

[0013] Furthermore, the alkaline condition is specifically as follows: heating a 1-1.5 g / L sodium carbonate aqueous solution to 50-60° C. and keeping the temperature for 20-30 min.

[0014] From the above description, we can know that if the content of soda ash is too high, the fluorine-free waterproof agent on the fabric will fall off; if the content of soda ash is too low, the alcohol substances will not be completely removed and the waterproof effect will be poor. Therefore, the addition amount of soda ash is controlled to be 1~1.5g / L.

[0015] Furthermore, the acidic condition is specifically as follows: heating the 0.5-1 g / L acetic acid aqueous solution to 40-50° C. and keeping the temperature for 10-20 min.

[0016] From the above description, it can be seen that too high acetic acid content will cause acetic acid residue on the fabric surface, with odor, and cause waste; too low acetic acid content will lead to insufficient neutralization, the fabric surface will become alkaline, affecting the shaping and arrangement of the waterproofing agent, and having a negative impact on the waterproofing effect.

[0017] Too high a cleaning temperature may cause discoloration, shedding of the waterproof agent from the cloth surface, and waste of energy, so the present invention adopts a relatively low temperature during cleaning.

[0018] Furthermore, the temperature of the forming process is 140-150°C, and the machine speed is 20-30 m / min.

[0019] From the above description, it can be seen that the fabric is baked twice on the basis of waterproof setting through the setting process, so that the fluorine-free waterproof agent on the fabric undergoes secondary cross-linking, and the reaction is more complete, so as to enhance the waterproof effect.

[0020] Furthermore, the method for preparing the dyed fabric is specifically as follows: the grey fabric is sequentially subjected to a fabric arrangement process, a predetermined process, a dyeing process, a post-dyeing treatment process and a drying process to obtain the dyed fabric.

[0021] Furthermore, the predetermined process temperature is 190-200° C., and the machine speed is 20-30 m / min.

[0022] From the above description, it can be seen that the predetermined process uses a higher temperature to improve the dimensional stability of the fabric.

[0023] Furthermore, the post-dyeing treatment step is alkaline reduction cleaning or acid reduction cleaning.

[0024] Furthermore, the drying temperature of the drying process is 140-150° C., and the machine speed is 20-30 m / min.

[0025] Furthermore, after the drying process, the moisture content of the fabric is reduced to less than 3%.

[0026] Embodiment 1 of the present invention is: a waterproof finishing post-processing method, the steps are as follows: S1. Fabric preparation process: the grey fabric is polyester sandwich material, the yarns of the surface and bottom layers are: white semi-gloss 150D / 48F polyester recycled yarn FDY, the middle layer uses monofilament: white semi-gloss 40D / 1F polyester monofilament environmentally friendly recycled yarn; width 140cm, weight 398g / m 2 , horizontal density 9.8 / cm, vertical density 13.8 / cm; S2, scheduled process: perform scheduled processing in Monforts hot air stentering machine, the temperature is 200℃, the machine speed is 30m / min; S3, dyeing process: using an Ithaca overflow dyeing machine for dyeing, placing the embryo in 30°C water, adding a leveling agent three times, adjusting the pH value to 4.5 with glacial acetic acid, and then adding disperse dyes to obtain a dye solution; the dye solution is heated to 110°C at 1°C / min and kept warm for 10 minutes, then heated to 130°C at 1.2°C / min and kept warm for 20 minutes; finally, the temperature is lowered to below 80°C; the dye solution formula is shown in Table 1; Table 1

[0027] S4, post-dyeing treatment process: using Ithaca overflow dyeing machine for treatment, adding caustic soda and hydrosulfite to the post-treatment bath, then heating to 80°C for 20 minutes, cooling and draining to complete dyeing; the post-dyeing treatment formula is shown in Table 2; Table 2

[0028] S5, drying process: drying in Monfushi hot air stentering machine, drying temperature is 140℃, machine speed is 20m / min, after drying process, the moisture content of fabric is reduced to below 3%; S6, waterproof setting process: waterproof treatment is carried out in a Monfushi hot air stenter setting machine at a temperature of 150°C and a machine speed of 20m / min, and 5wt% of fluorine-free waterproofing agent KW-9038 (Zhuhai Huada Haohong Chemical) is added; S7, cleaning process: Use Ithaca overflow dyeing machine to process, put the fabric after waterproof setting process into water, add 1g / L soda ash, heat it to 60℃ and keep it for 20min, then cool it down and drain it, refill with clean water, add 0.5g / L acetic acid, heat it to 50℃ and keep it for 20min, cool it down and drain it again to complete the cleaning; S8, setting process: setting treatment is carried out in Monforts hot air stentering machine, the temperature is 150℃, and the machine speed is 20m / min.

[0029] Embodiment 2 of the present invention is: a waterproof finishing post-processing method, the steps are as follows: S1. Fabric processing: the grey fabric is a polyester sandwich material. The yarns of the surface and bottom layers are: white round glossy 300D / 96F modified polyester 110℃ environmentally friendly yarn DTY (Yuanfang Industrial (Shanghai) Co., Ltd.), and the middle layer uses monofilament: white round glossy 40D / 1F modified polyester monofilament environmentally friendly recycled yarn (Wuxi Jintong High Fiber Co., Ltd.); width 142cm, weight 398g / m 2 , horizontal density 9.8 stripes / cm, vertical density 14.9 stripes / cm; S2, scheduled process: perform scheduled processing in Monforts hot air stentering machine, the temperature is 195℃, the machine speed is 20m / min; S3, dyeing process: using an Ithaca overflow dyeing machine for dyeing, placing the embryo in water at 30°C, adding an anti-precipitation agent, a leveling agent, and sodium sulfate, adjusting the pH value to 4.5 with glacial acetic acid, and then adding a cationic dye to obtain a dye solution; the dye solution is heated to 90°C at 1°C / min and kept warm for 10 minutes, then heated to 115°C at 1.2°C / min and kept warm for 30 minutes; finally, the temperature is lowered to below 80°C; the dye solution formula is shown in Table 3; Table 3

[0030] S4, post-dyeing treatment process: use Ithaca overflow dyeing machine for treatment, add high concentration reducing cleaning agent and acetic acid to the post-treatment bath, then heat to 80°C and keep warm for 20 minutes, cool down and drain to complete dyeing; the post-dyeing treatment formula is shown in Table 4; Table 4

[0031] S5, drying process: drying in Monfushi hot air stentering machine, temperature is 150℃, speed is 20m / min. After drying process, the moisture content of fabric is reduced to below 3%; S6, waterproof setting process: waterproof treatment is carried out in a Monfushi hot air stenter setting machine at a temperature of 150°C and a machine speed of 20m / min, and 5wt% of fluorine-free waterproofing agent KW-9038 (Zhuhai Huada Haohong Chemical) is added; S7, cleaning process: Use Ithaca overflow dyeing machine for treatment, put the fabric after waterproof setting process into water, add 1g / L soda ash, heat it to 60℃ and keep it for 20min, then cool it down and drain it, refill with clean water, add 0.5g / L acetic acid, heat it to 50℃ and keep it for 20min, cool it down and drain it again to complete the cleaning; S8, setting process: setting treatment is carried out in Monforts hot air stentering machine, the temperature is 150℃, and the machine speed is 20m / min.

[0032] Embodiment 3 of the present invention is: a waterproof finishing post-processing method, the steps are as follows: S1. Fabric preparation process: the grey fabric is polyester sandwich material, the yarns of the surface and bottom layers are: white semi-gloss 150D / 48F polyester recycled yarn FDY, the middle layer uses monofilament: white semi-gloss 40D / 1F polyester monofilament environmentally friendly recycled yarn; width 140cm, weight 398g / m 2 , horizontal density 9.8 / cm, vertical density 13.8 / cm; S2, scheduled process: perform scheduled treatment in Monforts hot air stenter setting machine, perform scheduled treatment in Monforts hot air stenter setting machine, the temperature is 190℃, the machine speed is 30m / min; S3, dyeing process: using an Ithaca overflow dyeing machine for dyeing, placing the embryo in water at 30°C, adding a leveling agent three times, adjusting the pH value to 4.5 with glacial acetic acid, and then adding disperse dyes to obtain a dye solution; the dye solution is heated to 110°C at 1°C / min and kept warm for 10 minutes, then heated to 130°C at 1.2°C / min and kept warm for 20 minutes; finally, the temperature is lowered to below 80°C; the dye solution formula is shown in Table 5; Table 5

[0033] S4, post-dyeing treatment process: Use Ithaca overflow dyeing machine for set treatment, add caustic soda and hydrosulfite into the post-treatment bath, then heat to 80°C and keep warm for 20 minutes, cool down and drain to complete dyeing; the post-dyeing treatment formula is shown in Table 6; Table 6

[0034] S5, drying process: drying in Monfushi hot air stentering machine, temperature is 145℃, machine speed is 30m / min. After drying process, the moisture content of fabric is reduced to below 3%; S6, waterproof setting process: waterproof treatment is carried out in a Monfushi hot air stenter setting machine at a temperature of 140°C and a machine speed of 30m / min, and 4wt% of fluorine-free waterproofing agent KW-9038 (Zhuhai Huada Haohong Chemical) is added; S7, cleaning process: Use Ithaca overflow dyeing machine for treatment, put the fabric after waterproof setting process into water, add 1.5g / L soda ash, heat it to 50℃ and keep it for 30min, then cool it down and drain it, refill with clean water, add 1g / L acetic acid, heat it to 40℃ and keep it for 10min, cool it down and drain it again to complete the cleaning; S8, setting process: setting treatment in Monforts hot air stenter setting machine, temperature is 140℃, speed is 30m / min.

[0035] Comparative Example 1 of the present invention is: The difference between Comparative Example 1 and Example 1 is that there is no cleaning process and stabilization process.

[0036] Comparative Example 2 of the present invention is: The difference between Comparative Example 2 and Example 2 is that there is no cleaning process and stabilization process.

[0037] Comparative Example 3 of the present invention is: The only difference between Comparative Example 3 and Example 1 is that there is no cleaning process.

[0038] Comparative Example 4 of the present invention is: The only difference between Comparative Example 4 and Example 1 is that the cleaning process only performs cleaning under acidic conditions.

[0039] Comparative Example 5 of the present invention is: The only difference between Comparative Example 5 and Example 1 is that the cleaning process only performs cleaning under alkaline conditions.

[0040] The finished fabrics of Examples 1 and 2 and Comparative Examples 1 to 3 were subjected to a waterproof test, and the test results are shown in Table 7.

[0041] Table 7

[0042] It can be seen from Table 5 that after the water-repellent fabric is processed through the cleaning process and the finishing process of the present invention, the water-repellent effect can be improved by 0.5 to 1 level, and the anti-siphon effect can be improved by 10 to 15 mm.

[0043] In summary, the waterproof finishing post-treatment method provided by the present invention cleans the waterproof finished fabric under alkaline conditions to fully remove the alcohol substances carried by the fluorine-free waterproof agent itself on the fabric, thereby improving the waterproof effect; then cleans and neutralizes the alkaline substances on the fabric under acidic conditions to make the fabric neutral or slightly acidic, so that the hydrophobic groups of the waterproof agent molecules are arranged in a fixed manner to form a dense waterproof film, thereby improving the stability of the waterproof effect; and then bakes the fabric for a second time through a fixed process to cause the fluorine-free waterproof agent on the fabric to undergo secondary cross-linking, so that the reaction is more sufficient to further improve the waterproof effect.

[0044] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the specification of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A waterproof finishing post-treatment method, characterized in that: The method comprises the following steps: the dyed fabric is sequentially subjected to a waterproof setting process, a cleaning process and a setting process, wherein the cleaning process comprises sequentially cleaning under alkaline conditions and acidic conditions.

2. The waterproof finishing post-treatment method according to claim 1, characterized in that: The temperature of the waterproof setting process is 140-150° C., the machine speed is 20-30 m / min, and the amount of fluorine-free waterproofing agent added is 4-5wt%.

3. The waterproof finishing post-treatment method according to claim 1, characterized in that: The alkaline condition is specifically as follows: heating a 1-1.5 g / L pure ash aqueous solution to 50-60° C. and keeping the temperature for 20-30 min.

4. The waterproof finishing post-treatment method according to claim 1, characterized in that: The acidic condition is specifically as follows: heating the acetic acid aqueous solution with a concentration of 0.5-1 g / L to 40-50° C. and keeping the temperature for 10-20 min.

5. The waterproof finishing post-treatment method according to claim 1, characterized in that: The temperature of the forming process is 140-150° C., and the machine speed is 20-30 m / min.

6. The waterproof finishing post-treatment method according to claim 1, characterized in that: The method for preparing the dyed fabric is specifically as follows: the grey fabric is sequentially subjected to a fabric arrangement process, a predetermined process, a dyeing process, a post-dyeing treatment process and a drying process to obtain the dyed fabric.

7. The waterproof finishing post-treatment method according to claim 6, characterized in that: The temperature of the predetermined process is 190-200° C., and the machine speed is 20-30 m / min.

8. The waterproof finishing post-treatment method according to claim 6, characterized in that: The post-dyeing treatment process is alkaline reduction cleaning or acid reduction cleaning.

9. The waterproof finishing post-treatment method according to claim 6, characterized in that: The drying temperature of the drying process is 140-150° C., and the machine speed is 20-30 m / min.

10. The waterproof finishing post-treatment method according to claim 6, characterized in that: After the drying process, the moisture content of the fabric is reduced to below 3%.

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