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Studies on linear tow-density polyethylene functionalized by

Study on toughening modification of polyethylene

Dou Pengfei

(Changqing Oilfield Company, Yulin 718100, Shaanxi, China)
Abstract: Polyethylene (PE), as one of the top five synthetic resins, is also China's largest synthetic resin
with the largest production capacity and the largest import volume. With its good processing performance,
mechanical properties, chemical corrosion resistance, low temperature resistance, and the advantages of
wide source and low price, it has been widely used in the fields of film, packaging, pipe, sheet, fiber and so
on. Because of its good chemical corrosion resistance, low temperature resistance, water permeability and
low price, it has a great application prospect in building waterproof materials. However, there are many
kinds of polyethylene, and the performance and price of polyethylene of different kinds are quite different.
Single polyethylene is difficult to meet the performance requirements of building waterproof materials. The
main purpose of this study is to improve the toughness, strength, cohesiveness and low temperature flexural
properties of polyethylene by blending modification of PE/POE and PE/EVA, so as to achieve the national
standard of waterproof sheet for construction and make the product have certain economic benefits. In this
paper, the effects of the ratio of different grades of polyethylene in the blending modification system of HDPE/
LLDPE/POE and HDPE/LLDPE/EVA and the influence of the mixing ratio of POE (or EVA) on the properties of
the blends were discussed. The tensile properties, tear strength, watertightness, low temperature bending, hot
air aging, alkali solution aging and other properties of the materials after blending modification were tested,
to find out the relationship between material ratio and performance. Furthermore, the product formula with
all indexes reaching or even exceeding the national standard has been screened out and achieved good
results initially.
Key words: polyethylene; polyolefin elastomers; polyethylene vinyl acetate
(R-03)

2018 第 44 卷 ·19·
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