Modified high-density polyethylene composition used in extrusion blow molding, and preparation method thereof

Abstract

The invention relates to modified high-density polyethylene composition used in extrusion blow molding, and a preparation method thereof. The composition comprises blended components of, by weight: 100 parts of high-density polyethylene, 0.5-15 parts of powdered styrene-butadiene rubber, and 0.1-1.0 parts of a lubricant. The modified high-density polyethylene composition provided by the invention has relatively high toughness, relatively high high-temperature impact resistance, relatively high low-temperature impact resistance, good fluidity, and low extrusion torque value. The preparation method provided by the invention is advantaged in easy processing. With the method, products such as casing barrels, casing pots and automobile fuel tanks with high impact resistances can be manufactured by extrusion blow molding.

Description

technical field [0001] The invention relates to a polyethylene composition, and furthermore, to a modified high-density polyethylene composition with high toughness and low-temperature impact resistance and a preparation method thereof. Background technique [0002] High-density polyethylene (HDPE) used for extrusion blow molding hollow containers generally has corresponding requirements for materials, such as: the molecular weight of the material is relatively large, so as to ensure that the hollow products, especially the larger hollow products, have the ability to meet the requirements. Strength; the material is required to have good processing performance, and in the extrusion blow molding process, it must have good fluidity and toughness under the condition of satisfying the strength, so that it can be formed better and the product can obtain excellent performance; especially Large hollow packaging drums have to be loaded, unloaded and transported many times, sometimes ...

AI Technical Summary

Problems solved by technology

The copolymerization process reduces the crystallinity of the material, but some HDPE still has the problem of insufficient toughness, and the finished products are easily broken when transported under low temperature conditions, and the low temperature impact performance is low.

[0004] Patent CN1216936C proposes a special material for extrusion or blow molding grade molecular weight polyethylene. Its formula contains ultra-high molecular weight polyethylene, nano-inorganic materials, flow modifiers, coupling agents, compatibilizers, etc. Molecular weight polyethylene is relatively expensive and difficult to process; the nano-inorganic materials added to it need to be processed, etc., the process is more complicated, and the cost is bound to be higher

[0005] Patent CN1283710C discloses a polyethylene-based resin for hollow moldings. This patent adopts a multi-stage polymerization process or a melt-mixing method to obtain a polyethylene-based resin mixture. All of the mixture is polyethylene of different fractions; The polymerization process is not easy to control, and the melt mixing performance is not easy to stabilize

[0006] Patent CN101384627A also discloses a polyethylene resin for blow molding, including a series of polyethylene resins with environmental stress crack resistance and flexural elastic modulus, which are complicated to operate and unstable in performance

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