A chemically foamed high-density polyethylene/polypropylene composition and its preparation method

Abstract

The invention discloses a chemical foaming high-density polyethylene / polypropylene composition. The chemical foaming high-density polyethylene / polypropylene composition is prepared from the following components in percentage by mass: 52%-80% of high-density polyethylene, 15%-30% of polypropylene, 3%-8% of a compatilizer and 2%-10% of modified foaming masterbatch, wherein the compatilizer is a copolymer of propylene and other olefins; the modified foaming masterbatch is prepared from the following components in percentage by mass: 84%-90% of low-density polyethylene, 8%-12% of a chemical foaming agent, 0.1%-0.5% of a foaming aid, 1%-5% of a dispersant, 0.2%-0.8% of a lubricant and 0.1%-0.5% of an antioxidant. Through the chemical foaming high-density polyethylene / polypropylene composition, the hardness and the temperature resistance of the high-density polyethylene can be improved, so that the rejection rate of pair twist of finished cables and the soldering tin retraction length can be reduced.

Description

technical field [0001] The invention relates to the field of foaming materials, in particular to a chemical foaming high-density polyethylene / polypropylene composition and a preparation method thereof. Background technique [0002] Existing high-speed transmission cables such as USB3.0 cables, HDMI cables, and MICRO USB cables all use chemically foamed high-density polyethylene as the foam insulation layer, such as Chinese Patent Publication No. CN02135233, published on December 31, 2003 1, the name of the invention is polyethylene foam insulation composition for communication cables and its preparation method, which discloses a polyethylene foam insulation composition for communication cables and its preparation method. Its disadvantage is that the high-density polyethylene material is soft after foaming, and it is easy to deform under the increasingly miniaturized and lightweight wiring requirements. [0003] With the development of automatic cable welding technology, the...

AI Technical Summary

Problems solved by technology

The disadvantage is that the high-density polyethylene material is soft after foaming, and it is easy to deform under the increasingly miniaturized and lightweight wiring requirements

[0005] Chinese patent (Application No. CN201510372691.2) applied for a polypropylene foam composition and its preparation method and application, but polypropylene as the main substrate will cause the wire hardness to be too high, resulting in stiffness and poor low-temperature performance.

Chinese patent (application number CN201210086754.4) has applied for a kind of microcellular foamed polypropylene material and its preparation method, which should mainly be used in the field of auto parts, packaging and construction for injection molding. Disadvantages of high, stiff and poor low temperature performance

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