Application Of Low Temperature Plasma And Sizing Agent Surface Modification Technology In Recycling Of Automobile Interior Trim And Its Engineering

After years of continuous rapid development, glass fiber reinforced thermoplastic has accounted for over a quarter of the total FRP in the world. In recent years the growth rate is increasing because of its advantages such as light weight, high strength and high machining efficiency as well as its scope of application is more and more widely, especially with the rapid development of the automotive industry and the peoples’requirements that saving and environmental protection to the automobile, the thermoplastic material is favored by automotive industry or its advantages of light weight and high strength. While its scrap, waste material and old materials is also bound to increasing with the mass production and applications of glass fiber reinforced thermoplastic, which is a great harm to the environment. Now people are needing higher and higher requirements on the environment which makes the green of recycling composites that glass fiber reinforced the thermoplastic (GFRTP) become an difficult problems to environmental and an big obstacle.Therefore, in this paper the plan to the recycle of composites that glass fiber reinforced PP(GFRPP) that is making the polypropylene, interior scrap and other ingredients become particles directly by melt blending and then the particles is used in the manufacture of large GFRPP products has been made. The plan has recycled scrap and fabricated thermoplastic composite materials successfully while the plasma and sizings fiberglass surface modification technology was used in the recovery of the automotive interior scrap. In addition the affection of the rheological properties, thermal properties and mechanical properties of the composite material were studied by the shredding dimensions, plasma modification and sizings modification.(1) Excluding of the plane that the scrap were peeled off under the high temperature thermoplastic hydraulic pressure firstly and then GFRTP and polyester fabrics were separately recovered and to use the another plane that shredding scrap into a certain size lumps by the self-designed fully enclosed mechanical force shredder firstly, adding the lumps into PP by the twin-screw extruder machine and being made into large GFRTP products finally. The affection to the composite performance were investigated when the shredding size of the lumps were5mm×5mm、10mm×10mm、15mm×15mm respectively. The results showed that the margin of increase of the mechanical properties of composites was the largest when the size of lumps was 15mm×15mm and the composite of the10m×10mm was second only to it, but the difference was small as well as the thermal stability and the processing of the composite was the best when the shredding size of the lumps were10mm×10mm.(2) Treating the surface of fiberglass by plasma treatment technology and to improve the self-designed formulations of the scrap recycling by the plasma and sizings treatment technology. The results showed that there occurring etch and a large number of free radicals on the surface of the glass fiber. The thermal decomposition temperature and the crystallization temperature of the composite elevated and substantially no change in crystalline form after plasma treatment at the same time the mechanical properties of composites improved significantly and its tensile and flexural properties has met the performance requirements of large GFRTP products but but there is a gap in impact properties. After the sizings treatment, the dynamic mechanical properties of composite showed regular changes, melting point and crystallization temperature elevated and substantially no change in crystalline as well as the tensile strength increased by18.5%and flexural strength and modulus were increased by20.1%,26%respectively and impact strength has doubled which can meet the performance and cost of the large GFRTP products.(3) In order to make the formulation of industrialization, the paper also enlarged the recipe and studied to determine the screw speed was18.7HZ and the processing temperature reduced about10℃from testing machine to amplify machine while designed the suitable screw configuration and screw combination at the same time designed processes which was convenient to automated production and friendly to environment.