Abstract
An electro-conductive para-aramid knit was manufactured by a dip-coating in a graphene/waterborne polyurethane(WPU) composite for confirming to use as a fabric heating element applicable to a protective clothing requiring durability. The para-aramid knit was dipped in 8 wt% graphene/WPU composite solution up to five-coat cycles. As a result of electro-conductive textile by number of dip-coating cycles, the electrical, and specifically electrical heating performances were increased number of cycles from one to five. The sample with the best electrical and electrical heating performance was the five-coat sample, and to improve those properties it was hot-pressed at 100 °C, 120 °C, 140 °C and 160 °C. After hot pressing, the entire surface of the sample was filled with graphene/WPU composite and indicated smoothly surface, thus the electrical and electrical heating performance was improved than the five-coat sample. The best performance of was indicated hot-pressed at 140 °C, with a surface resistivity and capacitance of 7.5 × 104 Ω/sq and 89.4 pF, respectively. When a voltage of 50 V was applied, the surface temperature reached 54.8 °C. The five-coat sample with hot-pressed at 140 °C could be applied to a heat-resistant para-aramid knit glove with the touch screen of a mobile phone and electric heating performance.
Highlights
Dip coating is a simple method for coating graphene onto fabrics or textile fibers[14,15,16,17,18,19,20]
The surface resistivity of the samples was analyzed in relation to the weight increase with the number of dip-coating cycles (Fig. 1(c))
It was shown that the three, four, and five-coat samples could be used as an electrical conductor to light two light-emitting diodes (LEDs)
Summary
Dip coating is a simple method for coating graphene onto fabrics or textile fibers[14,15,16,17,18,19,20]. Folding induced microcracks were applied as defects that affected the properties, and the conductor could be healed by hot-pressing to restore the initial electrical conductivity Fabrics such as cotton or polyester are mainly used for fabricating electro-conductive textiles due to commercial availability, usefulness, comfort, and low cost[14,15,16,17,18,19]. As-fabricated graphene/WPU composite dip-coated para-aramid knit textile which possessed the electrical heating performance was prepared to apply the functional clothing that required flexible, high durability and heat resistance, such as protective clothing, outdoor or leisure sports clothing, etc. The 8 wt% graphene/WPU composite solution was prepared, and dip coated on para-aramid knit from one to five times, and the characteristics of samples by the number of coating cycles. The electro-conductive textile was applied to the para-aramid knit glove to confirm its electrical and electrical heating performances as an e-textile
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