Preparation And Process Of Continuous Carbon Fiber Reinforced Thermoplastic Resin Matrix Composites

Continuous carbon fiber reinforced thermoplastic resin matrix composites have superior properties such as lightweight,high strength and environment-friendly recyclable,have become hot spots of research and application in various fields.Among them,the composites of continuous carbon fiber(CCF)and nylon 6(PA6)can combine their respective advantages.It is thermoplastic resin matrix composites which are the focus of automotive lightweight and other fields.However,CCF with PA6 or other low melt index thermoplastic resin have many problems such as complex difficulty,high cost and the need to improve composite material performance.This topic used PA6 as a matrix to explore the preparation process of CCF reinforced PA6(CCF/PA6)composites from three aspects including CCF surface modification,laminate structure design and molding methods.So that we could find ways and modes to solve the problems in application of continuous carbon fiber thermoplastic composites.Consequently,it is helpful for the structure design,performance improvement and cost saving of the final lightweight composites on automotive,aircraft and other industries.The main contents and results of this paper are as follows:1.The surface of continuous carbon fibers was oxidized by hydrogen peroxide,ultrasonic and combined ultrasonic-hydrogen peroxide for different times,respectively.The changes of surface properties and bulk strength of CCF were characterized.In addition,the composites using CCF combined oxidized for different times and PA6 were prepared to study the effects on interlaminar shear strength.Finally,the comparison shows that the combined oxidation has advantages and combined oxidation for 20 min affords the better parameter.2.The surface of continuous carbon fibers was oxidized respectively by potassium permanganate treatment,concentrated nitric acid treatment,electrochemical oxidation and combined ultrasonic-hydrogen peroxide oxidation,which were all adopted with the best process conditions.The surface structure,surface energy,impregnation effect and tensile properties of CCF before and after treatment were characterized.The final comparison shows that combined ultrasonic-hydrogen peroxide oxidation has optimum comprehensive performance in various methods.3.The different physical models of CCF/PA6 composite laminates were established by controlling the layer angle and the layer order of the unidirectional CFRP.The strain change and the distribution of stress field were analyzed by ANSYS ACP.Then the 0 and 90 degree alternating balanced symmetric laying was analyzed as a relatively optimized layer mode.4.Continuous carbon fiber reinforced thermoplastic composite materials were prepared by hot press molding using continuous carbon fiber as a reinforcement and nylon 6 as a matrix.The molding process parameters such as hot-pressing temperature,hot-pressing pressure,hot-pressing time and holding time were investigated through orthogonal experimental design.The better production process condition was determined that hot-pressing temperature is 250?,hot-pressing time is 20 minutes,hot-pressing pressure is 3MPa and holding time is 90 minutes.And the influence of various parameters on the mechanical properties of composite laminates was analyzed from large to small as follows:hot-pressing temperature,hot-pressing time,hot-pressing pressure and holding time.