Study On Preparation And Properties Of High Performance Fiber Reinforced High Density Polyethylene Composites

With the development of the country's economy,the pipeline-specific materials currently on the market cannot meet the needs of heat-resistant,pressure-resistant,and low-cost fields in emerging fields such as oilfields and pipelines.Therefore,there is an urgent need to develop new pipeline-specific materials.High-performance fiber-reinforced high-density polyethylene(HDPE)composites have attracted wide attention because of their excellent properties such as light weight,high strength,impact resistance,wear resistance,and heat resistance.In this dissertation,the high-density polyethylene pipe special material was used as the matrix resin to study the reinforcing effect of carbon fiber and ultra-high molecular weight polyethylene fiber on high-density polyethylene,and the application of high-new energy fiber composite material in oil field pipe under low-cost conditions was explored.In this thesis,firstly,the extrusion molding process was adopted,and high-density polyethylene was selected as the matrix resin to prepare different carbon fiber composite materials.The basic properties and mechanical properties of the composites were studied using densitometers,thermal deformation Vicat softening meters,material testing machines,and scanning electron microscopy.The carbon fiber reinforcement mechanism and composite material fracture damage were analyzed.The results show that the carbon fiber can effectively improve the heat resistance and rigidity of the composites.The Vicat softening temperature of the CF content of 20 wt%can be increased up to 79°C and the temperature of the matrix resin can be increased by 4°C.When the content of 5 wt%is added,the crystallinity of the composite is the highest,and the tensile modulus and flexural modulus increase 28%and 31%,respectively,relative to the matrix resin.The toughness,antioxidant aging properties,flow properties and density can meet the requirements of low cost heat resistance development.Pressure pipe special material requirements.UHMWPE fiber-reinforced high-density polyethylene composites were prepared using a compression molding process.The UHMWPE fiber is not melted at the molding temperature of 140°C,and can improve the heat resistance,toughness,and rigidity of the matrix resin.The composite Vicat softening temperature of 78°C increased 7°C relative to the matrix resin,and the impact strength of 106 KJ/m~2 increased by 266%compared to the matrix resin.The flexural modulus and flexural strength of the composite improved slightly relative to that of the matrix resin.The overall performance is significantly improved.