Exploration On The Reuse Technology Of Waste Cable Insulation Material Crosslinked Polyethylene For Wallboard Preparation

This research is a sub-project of the green manufacturing system integration project of the Ministry of Industry and Information Technology"for the construction of'One Belt And One Road'green design platform for wire and cable",which is about the recycling and utilization of XLPE.Disused crosslinked polyethylene(XLPE)is a thermosetting material that transforms from linear shape to shape in the process of crosslinking.Its three-dimensional network structure is relatively stable,does not melt when heated and is difficult to dissolve in solvents.The current study intends to use mechanical grinding powder to fill the high density ethylene(HDPE)to prepare the plate,and explore the possibility of using it as the ring protection wall panel.In the second chapter,the best formula of filling HDPE with XLPE was explored.In the third chapter and the fourth chapter,organic montmorillonite and nano calcium carbonate particles were used to fill HDPE composite to test its mechanical properties and friction and wear properties.Specific plans and conclusions are as follows:After the waste XLPE is softened in the oven,it is cut into particles with particle size not greater than 5 mm³,which is crushed into particles of 100?m³?150?m³by the grinder.The samples of XLPE and HDPE with different formulations are melted and mixed and injected into the experiment by the torque rheometer and micro-injection machine.The FTIR,tensile property,notch impact property,bending property,hardness and friction and wear property of HDPE composite filled with XLPE were tested.The section morphology was observed by SEM.The experimental results are as follows:HDPE composites filled with 6%XLPE show good mechanical properties and friction and wear properties.Compared with pure HDPE,the notch impact strength is increased by 25.6%,and the specific wear rate is 15.13×10^-7mm³/N·m,which is reduced by 10.10%compared with pure HDPE.Subsequent studies will take the formula as the matrix for further exploration.Using the preparation method in the previous chapter,organic montmorillonite(OMMT)was added into the mixture of 6%XLPE and HDPE to make the standard splines required for different experiments.The effects of OMMT on the tensile strength,bending strength,notch impact strength,hardness and friction and wear properties of6%XLPE/HDPE composite were tested.The results show that 4%OMMT can significantly improve the bending strength of the composites,which is 47.95%higher than that of 6%XLPE/HDPE composites without OMMT.When the ratio of montmorillonite in the composite is 8%,the friction coefficient is 0.213,which is18.33%higher than that of 6%XLPE/HDPE.When the content of OMMT is 2%,the specific wear rate is 11.83×10^-8mm³/(N·m),which is 10%lower than that of the composite without OMMT.Preferred 4%The montmorillonite content formula.Since the notch impact strength of 6%XLPE/HDPE composite with montmorillonite was reduced,nano calcium carbonate particles were added to toughen and strengthen the composite.3%,5%,7%and 10%Nano-Ca CO₃particles were selected to add into the 6%XLPE/HDPE composite material.The experiment proved that the composite material with 7%Nano-Ca CO₃/6%XLPE/HDPE formula had better properties.Compared with the sample without nano-sized calcium carbonate,the elongation at break is increased by 42.51%,the bending strength is increased by 19%,the notch impact strength is increased by 18.3%,and the elongation at break is increased by 44.3%compared with the sample without nano-sized calcium carbonate(24.6 k J/m²).Appropriate amount of nanoparticles has obvious effect on improving notch impact strength of composites.The addition of Nano-Ca CO₃particles can reduce the friction coefficient and specific wear rate of the composites.Compared with6%XLPE/HDPE matrix,the addition of 7%Nano-Ca CO₃particles reduces the friction coefficient and specific wear rate of the composites by 9.7%and 74.5%,respectively.In conclusion,the composite material of 7%Nano-Ca CO₃/6%XLPE/HDPE was selected as the optimal experimental scheme for the clapboard.