| Ordinary textile fibers often have static electricity during production and use,which brings inconvenience and danger to people’s daily life.At the same time,some chemical fiber and textile products also have problems such as flammability,poor antibacterial property,and incompatibility with electromagnetic radiation.The organic conductive fiber has good electrical conductivity,thermal conductivity,electromagnetic radiation resistance and other properties,can better deal with the textile fiber easy to produce static,flammable,poor antibacterial and other issues.As one of the organic fibers,aramid fiber has the characteristics of high strength,high modulus,good heat resistance,chemical resistance,etc.It is an ideal substrate for the preparation of conductive fibers.The use of aramid fibers to prepare conductive fibers can practically solve the problems of textile fibers that are prone to electrostatic effects,poor heat resistance,and the inability to shield electromagnetic radiation.In the choice of the method for preparing aramid conductive fibers,the electroless plating method is an ideal solution for preparing aramid conductive fibers because of its simple preparation process,no need for large-scale instruments,and little effect on the mechanical properties and heat resistance of aramid fibers.In this paper,conductive aramid fiber was prepared by surface pretreatment,sensitization activation and electroless plating of aramid fiber,and the conductivity of the fiber,adhesion of the metal layer,mechanical properties,thermal stability and washability analyzed.The main research contents of this paper are as follows:Aramid fibers surface pretreatment,first use different organic solvents to clean up the oil on the fibers surface,and then use different acid and alkali solvents to roughen the fibers surface.After experimental analysis,the surface of the fiber is smooth after ultrasonic treatment in an acetone solution at 30 ℃for 30 minutes.It shows that the oil cleaning effect is better;The fibers were immersed in a H3PO4 solution with volume fraction is 30v%at 30 ℃ for six minutes,the surface was filled with grooves,and these grooves acted as anchoring points in the electroless plating process,which can increase the binding force between the metal particles and the suction fibers.(1)Preparation of silver-plated aramid conductive fibers,first coating the surface of the fiber with polydopamine layer,after the sensitization and activation process,metal catalytic centers are formed on the fiber surface.Finally,the surface of the fibers deposited with the silver particles was subjected to electroless silver plating.After the fiber is coated in a dopamine concentration of 2g L-1(pH=8.5)for at least 12 hours,the coating effect is ideal;the use of Pd or Ag as a catalytic activation center facilitates the deposition of silver particles during electroless plating;In the electroless plating process,the control temperature is 30～33 ℃ and the time is 20 minutes.The silver-plated aramid fibers prepared have good electrical conductivity,mechanical properties and thermal stability.(2)Preparation of electroless nickel-silver aramid conductive fibers.First,the fiber is sensitized and activated,followed by electroless nickel plating,and finally electroless silver plating.After the fibers are treated in a nickel plating solution at a temperature of 85～88℃ for 2 minute,the fibers surface can be completely covered with nickel-phosphorus metal layer,followed by 20 minutes electroless silver plating treatment.The nickle-silvered aramid fibers prepared have good electrical conductivity,mechanical properties and thermal stability. |
PDF Full Text Request