A low embrittlement temperature, high elongation at break polypropylene composite material and preparation method thereof

Abstract

The invention discloses a polypropylene composite material with low brittle temperature and high elongation at break. The polypropylene composite material is prepared from the following components inparts by weight: 60-90 parts of polypropylene, 0-10 parts of toughening agent and 0.2-0.4 part of lubricating agent, wherein polypropylene is ethylene-propylene co-polypropylene; the weight-average molecular weight of polypropylene is more than 80,000. The polypropylene composite material disclosed by the invention has the beneficial effects that by adoption of the ethylene-propylene co-polypropylene and addition of a little of lubricating agent, the elongation at break is increased, the use amount of the toughening agent is reduced, and then the stability of the elongation at break is improved, so that the polypropylene composite material with low brittle temperature and high elongation at break is prepared. Simultaneously, the invention also discloses a preparation method of the polypropylene composite material with low brittle temperature and high elongation at break.

Description

technical field [0001] The invention relates to a polypropylene composite material and a preparation method thereof, in particular to a polypropylene composite material with low embrittlement temperature and high elongation at break and a preparation method thereof. Background technique [0002] Polypropylene materials are widely used in the interior and exterior of automobiles because of their relatively low cost, good solvent resistance, good electrical insulation, excellent mechanical properties, and good processability. With the development, customers began to put forward higher requirements on the elongation at break of polypropylene to meet the requirements of more parts. [0003] Generally, polypropylene is rigid, and the elongation at break is difficult to achieve a high level. Although atactic polypropylene has a high elongation at break, it is easy to become brittle at low temperatures. Some scholars use polyethylene with a relatively high elongation at break for p...

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Problems solved by technology

[0003] Generally, polypropylene is rigid, and the elongation at break is difficult to achieve a high level. Although atactic polypropylene has a high elongation at break, it is easy to become brittle at low temperatures. Some scholars use polyethylene with a relatively high elongation at break for polypropylene Propylene is modified to obtain a composite material with a relatively high elongation at break, but on the one hand, polyethylene will reduce the mechanical properties of the material, and on the other hand, there are certain compatibility problems between polyethylene and polypropylene, and the obtained elongation at break is not Stablize

In addition, some scholars have obtained polypropylene composite materials with low embrittlement temperature and high elongation at break by increasing the content of toughening agent, but the increase of toughening agent content will reduce the tensile and bending properties of the material, and the cost will increase at the same time. Reduce the usefulness of the material

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