Research on Yarn Waterproof Finishing and Knitted Fabric Properties and Influencing Factors

2022-04-23   Pageview:226

In this paper, carbon 4 fluorine series finishing agent is used to finish the yarn with waterproof function, and a waterproof film layer is formed on the surface of the fiber and yarn to solve the problem that the waterproof film layer of knitted fabric is damaged under the action of external force. The carbon 4 fluorine series finishing agent meets the requirements of Environmental requirements to ban the use of perfluorooctane sulfonate (PFOS) and perfluorooctanoic acid (PFOA).

1. Brief description of the experiment

The acrylic/nylon blended yarn is immersed in a water repellent solution of a certain mass concentration for a certain period of time, dehydrated to control the liquid rate, and dried. The process flow is as follows: dyed yarn skein→water repellent solution impregnation→centrifugal dehydration→baking.

2, the experimental process

The effects of different water repellent concentrations, baking temperature, hydrophobic wax emulsion manufacturer in netherlands baking time and liquid waiting rate on the waterproof effect of the yarn were investigated respectively.

3. Experimental results

After the fabric is washed, if the water repellent deposited on the surface of the fabric falls off, the surface energy of the fabric will increase and the waterproof performance will gradually lose. Therefore, washing resistance is also an important performance of waterproof fabrics. In this experiment, based on the initial test of the samples, the standard household washing and drying procedures were carried out 1, 3 and 5 times, and the spray test scores were respectively carried out again.

Under the field emission scanning electron microscope, the fiber surface topography of the acrylic/nylon blended yarn before and after finishing is magnified by 5000 times. Microscopically, the surface of the unfinished fiber shown in Fig. 2(a) is relatively smooth and free of particles attached, while the surface of the fiber after water repellent treatment shown in Fig. 2(b) has 0.1-0.5 μm particles deposited. It shows that the waterproofing agent used in the experiment is attached to the surface of the fiber, and the purpose of waterproofing the fiber is achieved by reducing the surface energy of the fiber.

After the acrylic/nylon blended yarn is treated with water repellency, the water resistance of the fabric is significantly improved. After the spray test, the surface of the fabric has no wetting, only a small amount of water droplets adhere, and the score can reach 95 points (ISO4 level)

With the increase of the mass concentration of the water repellent solution, the waterproof performance of the fabric is improved. However, after further increasing the solute concentration of the water repellent to 140 g/l, the water repellent performance and its washability were not significantly improved. Combined with the production cost, when the mass concentration of the water repellent solution is 120g/l, the fabric can obtain better water-repellent performance.

The increase of drying temperature has no significant effect on the improvement of the fabric’s water-repellent performance, but has a certain effect on the improvement of its washing fastness. When the drying temperature was increased to 110°C, the water repellency and washing fastness were not further improved. Therefore, 100°C is recommended as the optimum drying temperature.

The drying time has a certain influence on the waterproof performance of the fabric, and this influence becomes more and more obvious with the increase of washing times. Therefore, 25min is recommended as the best drying time.

It can be seen from the experimental data that under the process conditions of water repellent solution mass concentration of 120 g/l, drying temperature of 100 °C, and drying time of 25 min, the liquid carrying rate has no obvious effect on the water-repellent performance of the fabric. Increase, the effect of the liquid carrying rate on the water-repellent performance and washability begins to appear.

In conclusion

In this paper, the acrylic/nylon blended yarn was treated with water-repellent function by carbon 4 fluorine-based finishing agent. Influence. The research shows that the reasonable finishing process is that the mass concentration of the water repellent solution is 120g/l, the drying temperature is 100℃, the drying time is 25min, and the liquid carrying rate is 30%. The spray test score of the knitted fabric treated under this process condition can reach 95 points according to the AATCC standard, and 85 points after 5 times of washing. After water-repellent finishing, a water-repellent film layer is formed on the surface of the fibers and yarns, giving the knitted fabric a better water-repellent function. The development of cap products can meet the requirements of keeping warm and waterproof when going out for sports in mild rain and snow in winter.

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