Preparation And Performance Study Of HDPE/Nano Inorganic Particle Blow Molding Special Material

High-density polyethylene(HDPE)has the advantages of low price,easy processing,environmental stress cracking resistance(ESCR)performance,stable parison and inflation performance,etc.It is widely used,especially in food production containers and industrial bottles Among all kinds of large,medium and small hollow blow molding products,the total production of high-density polyethylene in 2017 reached 4.293 million tons,and 4.389 million tons in 2018,and the annual total output increased by about 3.7%.However,it also has defects such as swelling with organic substances,poor air permeability,and easy leakage when containing hydrocarbons and organic solvent substances.Therefore,it needs to be functionally modified by physical or chemical methods to become a mixed material to broaden its application field.To meet the needs of its high performance and multi-function.In this paper,Dushanzi Petrochemical Company's HD5502GA high-density polyethylene(HDPE)is used as the base resin,and nano-MMT and modified nano-MMT(dioctadecyl methyl ammonium chloride-XY-5)are used as fillers.The nucleating agent(HPN-210M,HPN-20E)and toughening agent(CZ-02)are used as additives.The special material for blow molding of HDPE/nano inorganic particles is prepared by melt blending method,and its microscopic morphology is systematically studied,Mechanical properties,light transmission properties,barrier properties and other research contents and conclusions are as follows:(1)Through the particle size distribution and X-ray diffraction method,the average particle size,specific surface area,interlayer spacing,etc.of layered nano-MMT and nano-CaCO3 are compared and analyzed to determine that nano-MMT is a special material for HDPE/nano inorganic particle blow molding preparation and performance of fillers and provide basic data for subsequent research.(2)The HDPE/nano-MMT special blow molding material was prepared by the melt blending method,and compared with the pure HDPE material.The results showed that the tensile properties and impact resistance of the HDPE/nano-MMT composite material were higher than that of the pure HDPE material 4.03%and 5.87%,but no improvement in oxygen barrier performance.(3)The enhancement experiments of different nucleating agents(HPN-210M,HPN-20E)on HDPE were explored.The results show that when the mass ratio of HDPE to HPN-210M is 2000:1,the tensile properties of the composite are improved by 8.6%,and the impact resistance The performance is improved by 28.47%,and the barrier performance is improved by 13.24%;when the mass ratio of HDPE to HPN-20E is 2000:1,the tensile performance is increased by 5.02%,and the impact resistance is increased by 20.61%.At that time,its barrier performance increased by 10.87%.(4)The strengthening experiment of toughening agent(CZ-02)on HDPE matrix material was explored.The results show that when the mass fraction of CZ-02 is 2%,the optimal tensile strength and impact strength of the composite material are more than that of pure HDPE matrix material,increased by 5.02%and 31.47%respectively.(5)The HDPE/modified nano-MMT blow molding special material was prepared by melt blending method,and the proportion of HPN-210M in(3)and CZ-02 in(4)was used as an auxiliary agent.The results showed that:modified nano-MMT as the composite material with filler and proper amount of nucleating agent and toughening agent has better compatibility and less agglomeration than nano-MMT as filler,and it is easier to form a barrier layer.At the same time,the melting and crystallization temperature increase,and the thermal stability,Tensile properties,impact resistance,light transmission properties,barrier properties improved.Compared with pure HDPE materials,HDPE/modified nano-MMT composite materials can increase the tensile properties,impact resistance and barrier properties by 15.6%,5.37% and 18.52% respectively.