Research On The Recycling Process Of Waste Cable Materials XLPE To Prepare Industrial Board Raw Materials

For the recycling and reuse of waste cable material cross-linked polyethylene(XLPE),the research group found that the filling amount of the waste cable materials XLPE was 10 wt.% by injection molding.Compression molding to increase the filling of waste XLPE up to 30 wt.%.Because XLPE had a three-dimensional network structure,the recycling process of complete de-crosslinking was relatively complicated,and the equipment investment was relatively large.Therefore,this paper adopts the partial de-crosslinking of waste XLPE,used low density polyethylene(LDPE)as the matrix materials,and used a grain mill to pulverize the waste XLPE into LDPE as a reinforcement materials to explore its used in environmental protection industry Possibilities of sheet raw materials.The second chapter of the thesis explores the optimal formulation of waste XLPE filled LDPE composited materials、Water absorption and friction and wear properties.The specific research plans and conclusions were as follows:(1)Washed the waste XLPE,dry it,cut it into pieces,then pulverize it with a grain mill,and used an internal mixing rheometer to mix the waste XLPE and LDPE with a mass ratio of 10%,15%,20%,25%,and 30%.Mix and melt granulation,and then used micro injection molding machine and flat vulcanizer to prepare test samples.Finally,the mechanical properties,water absorption and thermal deformation properties,friction and wear properties of waste XLPE/LDPE composites were tested.The experimental results show that: when the waste XLPE/LDPE composites were used When the content of25 wt.%,the mechanical properties of the waste XLPE/LDPE composites materials were the best,the specific wear rate was 86.60% lower than that of the pure LDPE materials,and the notched impact strength was reduced to a certain extent.The wear mechanisms were mainly adhesive wear and abrasive wear.Therefore,the mass ratio of the 25 wt.%waste XLPE/LDPE composites materials was selected as the matrix materials for subsequent composites materials research.(2)Melting and granulating used the same mixing method,adding different contents of corn stalk powder to the 25 wt.% waste XLPE/LDPE composites materials,the mass ratios of which were 1%,3%,5%,and 7% respectively;The test samples were prepared in the same preparation method,and the mechanical properties,water absorption and thermal deformation properties,friction and wear properties of the waste XLPE/LDPE/corn straw powder composites were tested.The experimental results show that: when the content of corn straw powder was 5wt.% The flexural strength of the composite was 30.1% higher than that of the 25wt% waste XLPE/LDPE composites;the thermal deformation of the composite was the smallest,and the thermal deformation resistance was the best,which was 20.9% lower than that of the 25wt% waste XLPE/LDPE composites;The specific wear rate and friction coefficient of the composites were 61.68% and 29% lower than those of the 25 wt.% waste XLPE/LDPE,respectively.The main wear mechanisms were the peeling off of the transfer film and slight fatigue wear.(3)The choice of corn stalk powder reinforced composites materials provides a new direction for the treatment of corn stalk,but the notched impact strength and other properties of the composites materials have declined to a certain extent.Kaolin enhanced the comprehensive properties of the composites materials,and the content of nano-kaolin was 1%,3.5%,6%,8.5%,and 11%,respectively.Used the same mixing method and sample preparation method,the mechanical properties,water absorption and thermal deformation,friction and wear properties of the Nano-kaolin/waste XLPE/LDPE composites were tested.The results show that: when the content of nano-kaolin was6%,The tensile strength,flexural strength,notched impact strength,water absorption and thermal deformation resistance of the Nano-kaolin/waste XLPE/LDPE composites were increased by 6.6% and 35.4%,respectively,compared with the 25% waste XLPE/LDPE composited 18.1%,41.7% and 15.9%;The Nano-kaolin/waste XLPE/LDPE composited had the smallest specific wear rate and friction coefficient,which decreased by 52.4% and27.5% compared with the 25% waste XLPE/LDPE composites.The wear modes of 6%nano-kaolin/25% waste XLPE/LDPE composites were mainly abrasive wear and fatigue wear.