Production process to improve the waterproofness of coated fabrics

Baking temperature process conditions: padding (TF- 630 50 g/L, TF- 630C 10%, liquid rolling rate about 95%) → baking (60 s) → moisture regain → test. From 1, 2 and 4, it can be seen It is found that as the baking temperature increases, the stiffness of the cloth surface increases significantly, and the formaldehyde content decreases accordingly. When the baking temperature rises to 210°C, a slight odor appears on the cloth surface after baking. Combined with the factory application situation , it is recommended that the factory set the baking temperature at 190~200 ℃.

It can be seen from 3, 4 and 5 that as the baking time is extended, the stiffness of the cloth surface increases significantly and the formaldehyde content also decreases. However, when the baking time is extended to 120 s, a slight odor appears on the cloth surface. .Combined with the cloth surface effects produced by different baking temperatures, the reasons were analyzed and it was concluded that the baking temperature is too high and the time is too long, which easily produces trimethylamine [(CH3)3N] during the reaction of TF-630, causing the finished fabric to be damaged. There is a fishy smell. [3] Therefore, when finishing, you can increase the baking temperature and reduce the baking time accordingly, or reduce the baking temperature and increase the baking time accordingly, both of which can achieve ideal application effects. .Based on the actual situation of the factory, for fabrics with a mass per unit area of 200 g/m2, it is recommended to use a speed of 60~70 m/min.
Process conditions without adding catalyst: padding (water padding rate is about 95%) → baking (180 ℃, 60s) → moisture regain → test. It can be seen from 5, 6 and 6 that under conventional process conditions, using TF- alone When 630 is used for finishing, the more TF-630 is used, the higher the free formaldehyde content on the cloth surface will be, and the heavier the odor will be on the cloth surface, while the stiffness will not increase significantly. The reason is that although TF-630 does not need to be cleaned under the action of high temperature, infrared rays, etc. The curing agent can also be completely cured, but it requires a longer reaction time. Under the normal process conditions of the factory, the reaction of TF-630 is very incomplete. Therefore, it is recommended that the factory use TF-630 for finishing and select an appropriate catalyst at the same time to make TF – 630 is completely cured in a short time. Composite finishing with other additives

Non-ionic penetrant TF-107A process conditions: water prevention (waterproof degree reaches 60~70 points, liquid removal rate 33%) → padding (TF- 630 30 g/L, TF- 630C 20%) → baking (180 ℃, 60 s)→Moisture regain→Test. It can be seen from 7 and 8 that under the premise that the permeability of the fabric is relatively poor, adding non-ionic penetrant TF-107A can accelerate the penetration of the working fluid into the fabric and significantly increase the liquid carrying rate of the fabric. , increase the stiffness of the cloth surface. The dosage of TF-107A can be controlled at 1~3 g/L.

Starch paste process conditions: padding (TF- 630 30 g/L, TF- 630C 20.0%) → baking (180 ℃, 60 s) → moisture regain → test. It can be seen from 9 that adding starch paste can significantly improve the fabric quality. Noodle stiffness. When 30 g/L of starch paste is added, the resulting paste will become jelly-like after being cooled for 12 hours, which affects the use effect. When 20 g/L is added, it can be left for about 168 hours (7 working days) after cooling. .It is recommended to add 10~20 g/L of starch paste. If you are processing white fabrics, consider that starch paste can easily produce mold spots in a humid environment, so you need to use it with caution.

Coating glue process conditions: sizing → scraping → baking (170 ℃, 60 s) → evaluation. It can be seen from 7 that adding a small amount of TF-630 to the coating glue can significantly improve the rub resistance of the coated fabric. Fastness. 2.2.4 Finishing process conditions in the same bath with waterproofing agent: padding → baking (180 ℃, 60 s) → moisture regain → test. The effect of adding TF-630 on the waterproofing effect is shown in 8. Adding TF-630 on the waterproofing effect The effect and the influence of cloth stiffness are shown in

9. 9 Effect of adding TF- 630 on the waterproof effect and fabric stiffness Formula/(g·L-1)TG- 528A TF- 630 TF- 630C30 0 030 30 630 60 10 Waterproof effect/min 100100100 Bending length/mm17 .243.260.4TF- 630 Dosage/(g·L-1) 6 Effect of not adding catalyst on the stiffness of the cloth surface 6 Effect of not adding catalyst on the odor of the cloth surface TF- 630 Dosage/(g·L-1) 0 10 No odor Slight 20 Obvious 30 Obvious 40 Obvious 50 60 70 80 Heavy, serious, serious cloth surface condition TF- 680 Rub 10 times 1 000 Better 1 000 Better Rub 30 times Obviously damaged Good rub 50 times Seriously damaged Damaged TF – 63020 formula/(g·L-1) 7 Effect of adding TF- 630 on fastness 8 Effect of adding TF- 630 on waterproof effect TF- 63005 Waterproof effect/min Initial waterproof effect 100 100 Washing 2 times Washing 5 times 90 70100 100TG – 528A3030TF- 630C01 formula/(g·L-1) It can be seen from 8 and 9 that a small amount of TF-630 is added to the waterproofing agent and can be used as a cross-linking agent to improve the washing fastness of the waterproofing agent. The recommended dosage of TF-630 3~5 g/L, TF- 630C 1 g/L. Increasing the dosage of TF- 630 can significantly improve the stiffness of the fabric without affecting the waterproof effect. It is recommended that factories process fabrics with waterproof and stiff requirements (such as tents) , can be waterproofed and stiffened in the same bath, shortening the process.

Factory mass production (1) The sample unit is a printing and dyeing factory in Taizhou, the fabric type is dark polyester Oxford cloth, the setting temperature is 200 ℃, the setting speed is 80 m/min, TF- 630 36g/L, TF- 630C 7.2 g/L, after finishing The bending length of the fabric is 37.6 mm, and the free formaldehyde content on the fabric surface is 59.9×10-6. (2) The sample unit is a unit in Wujiang, the fabric is red Oxford cloth, the setting temperature is 200°C, the setting speed is 100 m/min, TF- 630 100 g/L, TF- 630C 10 g/L, the flexural length of the fabric after finishing is 78.9 mm, and the free formaldehyde content on the cloth surface is 286×10- 6.3 Conclusion (1) Stiffening finishing agent TF- 630 is suitable for polyester Oxford cloth, during the finishing process , when ρ(TF- 630)=10~30 g/L, w(TF- 630C)=12.5%~25.0%; when ρ(TF- 630)=30~50 g/L, w(TF- 630C)=12.5%~20.0%; when ρ(TF- 630) is greater than 50 g/L, w(TF- 630C)=10.0%~16.7%. Control the baking temperature to 190~200 ℃. The baking time should be adjusted according to the mass per unit area of the fabric. When the mass per unit area of the fabric is less than 100 g/m2, use a speed of 80~110 m/min;

When the fabric mass per unit area is 100~200 g/m2, the vehicle speed is 70~90 m/min; when the fabric mass per unit area is greater than 200 g/m2, the vehicle speed is 60~70 m/min. (2) Stiff finishing agent TF-630 When used to process fabrics with poor initial penetration effect, 1~3 g/L non-ionic penetrant TF-107A can be added, which can significantly improve the fabric’s liquid removal rate and improve the stiffness of the fabric after finishing; add 10~20 g/L starch paste, which can significantly improve the stiffness of the fabric after finishing; TF-630 can be finished in the same bath as the waterproofing agent. A small amount of TF-630 is added to the waterproofing agent as a cross-linking agent to improve the washing fastness of the waterproofing agent [ ρ(TF-630)=3~5 g/L, ρ(TF-630C)=1 g/L]. Increasing the dosage of TF-630 can significantly improve the stiffness of the fabric without affecting the waterproof effect; flame retardant coating When TF-630 20 g/L is added to the layer glue, the rubbing resistance of the coated fabric can be significantly improved k8OPWGk

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