CFRP which has good strength rigidity and light weight has emerged as an alternative due to automobile fuel efficiency regulations. However, CFRP which is mainly used is manufactured based on thermosetting resin and is difficult to recycle. In addition, most CFRP is waste treatment causing environme...
CFRP which has good strength rigidity and light weight has emerged as an alternative due to automobile fuel efficiency regulations. However, CFRP which is mainly used is manufactured based on thermosetting resin and is difficult to recycle. In addition, most CFRP is waste treatment causing environmental pollution. In order to solve the current problems research and development of CFRP manufactured based on thermoplastic resin which is easy to recycle is being actively promoted.
In this paper, thermoplastic resin Polypropylene is used as a matrix. new Carbon Fiber(nCF) recycled Carbon Fiber(rCF) is used as a reinforcement.After extruding PP-nCF and PP-rCF pellets according to the contents of nCF and rCF, tensile, bending, and impact test specimen were manufactured using an injection molding machine, and mechanical properties were evaluated.
nCF used PAN-based carbon fiber(ACE C&TECH: ACECA-NA1). rCF was applied to the Chopped Carbon fiber recovered from the existing CFRP through the Heat treatment process. Heat treatment process was performed to desizing of nCF and rCF. (Heat treatment conditions: temperature was raised to 500℃ at 10℃/min and desizing at 500℃ for 5 hours.) PP-based nCF and rCF pallets were fabricated using a twin extruder. At this time, the contents of the added carbon fiber are 5, 10, 15, 20, 25 and 30wt.%.
Tensile specimen (ASTM D638), bending specimen (ASTM D790) and impact specimen (ASTM D256) were prepared using an injection molding machine.
Heat treatment process was performed to desizing nCF and rCF. Microstructure analysis was performed to confirm the presence of residual resin on the surface of the carbon fiber. Analysis of the nCF and rCF microstructures confirmed that the residual resin was removed cleanly.
Tensile strength results for injection test specimens by carbon fiber content of PP, PP-nCF and PP-rCF. PP-nCF and PP-rCF were compared with PP, the tensile strength of CFRP increased with increasing carbon fiber content. When the carbon fiber content was 30 wt%, PP-nCF improved 121.60% based on PP tensile strength, and PP-rCF improved 113.30%. PP-nCF is 1.07 times higher in tensile strength than PP-rCF. Tensile strength is 62.18MPa when the carbon fiber content of PP-nCF is 30wt.%, Which is 1.77 times higher than 5wt.%. Tensile strength of PP-nCF was 62.18MPa when the carbon fiber content was 30wt.%, Which is 1.77 times higher than 5wt.%. Tensile strength of PP-rCF was 59.85MPa when the carbon fiber content was 30wt.%, Which is 1.72 times better than 5wt.%. As result of the impact tests of PP, PP-nCF and PP-rCF, the impact strength of PP was the highest.
In the case of PP-nCF, the impact strength increased to 20wt.% And then decreased.. PP-rCF showed the highest impact strength at 10 wt.% And showed a tendency to decrease gradually.
The impact strength of carbon fiber composites was lower than that of PP as the carbon fiber was mixed with PP.
CFRP which has good strength rigidity and light weight has emerged as an alternative due to automobile fuel efficiency regulations. However, CFRP which is mainly used is manufactured based on thermosetting resin and is difficult to recycle. In addition, most CFRP is waste treatment causing environmental pollution. In order to solve the current problems research and development of CFRP manufactured based on thermoplastic resin which is easy to recycle is being actively promoted.
In this paper, thermoplastic resin Polypropylene is used as a matrix. new Carbon Fiber(nCF) recycled Carbon Fiber(rCF) is used as a reinforcement.After extruding PP-nCF and PP-rCF pellets according to the contents of nCF and rCF, tensile, bending, and impact test specimen were manufactured using an injection molding machine, and mechanical properties were evaluated.
nCF used PAN-based carbon fiber(ACE C&TECH: ACECA-NA1). rCF was applied to the Chopped Carbon fiber recovered from the existing CFRP through the Heat treatment process. Heat treatment process was performed to desizing of nCF and rCF. (Heat treatment conditions: temperature was raised to 500℃ at 10℃/min and desizing at 500℃ for 5 hours.) PP-based nCF and rCF pallets were fabricated using a twin extruder. At this time, the contents of the added carbon fiber are 5, 10, 15, 20, 25 and 30wt.%.
Tensile specimen (ASTM D638), bending specimen (ASTM D790) and impact specimen (ASTM D256) were prepared using an injection molding machine.
Heat treatment process was performed to desizing nCF and rCF. Microstructure analysis was performed to confirm the presence of residual resin on the surface of the carbon fiber. Analysis of the nCF and rCF microstructures confirmed that the residual resin was removed cleanly.
Tensile strength results for injection test specimens by carbon fiber content of PP, PP-nCF and PP-rCF. PP-nCF and PP-rCF were compared with PP, the tensile strength of CFRP increased with increasing carbon fiber content. When the carbon fiber content was 30 wt%, PP-nCF improved 121.60% based on PP tensile strength, and PP-rCF improved 113.30%. PP-nCF is 1.07 times higher in tensile strength than PP-rCF. Tensile strength is 62.18MPa when the carbon fiber content of PP-nCF is 30wt.%, Which is 1.77 times higher than 5wt.%. Tensile strength of PP-nCF was 62.18MPa when the carbon fiber content was 30wt.%, Which is 1.77 times higher than 5wt.%. Tensile strength of PP-rCF was 59.85MPa when the carbon fiber content was 30wt.%, Which is 1.72 times better than 5wt.%. As result of the impact tests of PP, PP-nCF and PP-rCF, the impact strength of PP was the highest.
In the case of PP-nCF, the impact strength increased to 20wt.% And then decreased.. PP-rCF showed the highest impact strength at 10 wt.% And showed a tendency to decrease gradually.
The impact strength of carbon fiber composites was lower than that of PP as the carbon fiber was mixed with PP.
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