What raw materials should be used for blow molding of hollow blow molding tray?What is its performance?
High molecular weight high density polyethylene (hdpe) is usually used as the main raw material in hollow blow molding disc. It can add 20% ~30% of its own recycled material and add 1% ~ 2% functional masterbatch according to different USES of the product.
The performance of HDPE mainly depends on its density, relative molecular mass and relative molecular mass distribution.The higher the density, the higher the rigidity and hardness of products, the stronger the resistance to chemical corrosion;The higher the relative molecular weight, the slower the polymer flow, the better the toughness and environmental stress cracking resistance.Relative to the distribution of molecular mass, the width of the distribution will directly affect the rate of polymer flow.
At present, HMWHDPE used in the production of hollow blow molding tray is made of ethylene polymerized with transition metal as catalyst under low pressure (0.31-0.48mpa) and low temperature (80-1i0cc). It is usually linear copolymer or homopolymer.Because HMWHDPE has the comprehensive requirements for all aspects of polymer in product manufacturing, especially its high molecular weight, it has excellent toughness and environmental stress cracking resistance, and can resist the corrosion of many chemicals.Its high density gives the product enough rigidity and hardness.In addition, its moderate relative molecular mass distribution can significantly reduce the difficulty of high molecular weight polymers in flow.