| 摘要 |
FIELD: chemistry.SUBSTANCE: invention relates to the technology of producing a stabilised composition based on low-pressure polyethylene which is meant for blow moulding and pressure casting articles. The method is realised by mixing, in a molten mixture, polyethylenes of different density and additives. The mixture of polyethylenes, taken in granular form, comprises high-density polyethylene and low-density linear polyethylene or high-density polyethylene and medium-density linear polyethylene. The additives are added the composition in form of an additive based on low-density linear polyethylene, which is obtained from a molten granular polymer concentrate. The additive contains a phenol antioxidant which is a sterically hindered phenol, and an ethylene and vinyl acetate copolymer which contains 9-16 wt % vinyl acetate, with the weight ratio of the low-density linear polyethylene to the ethylene and vinyl acetate copolymer ranging from 0.8:1 to 4.3:1. Content of the ethylene and vinyl acetate copolymer in the composition ranges from 0.5 to 1.5 wt % and content of the phenol antioxidant ranges from 0.05 to 0.15 wt %.EFFECT: stabilised compositions obtained using the disclosed method have an optimum set of physical and mechanical properties and high cracking resistance.4 tbl, 22 ex |
