Application of bio-based PA56/512 copolymer in track fasteners of GF/PA66 composites
Glass fiber(GF)/polyamide 66(PA66)/bio-based polyamide 56/512(PA56/512)copolymer composites were prepared by melt blending method.The effect of bio-based PA56/512 copolymer on the comprehensive properties of the composites and its application in track fastener products were investigated.The results show that PA56/512 copolymer can obviously improve the processing flow properties of the composites and promote the coating and dispersion of the glass fibers.The low temperature resistance of the composites can be improved,and the problem of high water absorption of the GF/PA66 composites can be solved.The comprehensive performances of the composite are the best when the mass fraction of PA56/512 copolymer is 20%.The addition of PA56/512 copolymer improves the insulation performance and appearance of the track fastener.X-ray testing results show that there is no porosity inside the product,which meets the application requirements in the field of rail transit.The problems of high water absorption and inability to balance the strength and low temperature toughness of traditional polyamide composites are solved with the introduction of PA56/512 copolymer,and the application range of track fasteners is greatly expanded.
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