Polypropylene/polyvinylidene fluoride blended modified material and preparation method thereof

Abstract

The invention discloses a polypropylene/polyvinylidene fluoride blended modified material and a preparation method thereof. The polypropylene/polyvinylidene fluoride blended modified material includes, by weight, 20-70 parts of polypropylene, 10-50 parts of polyvinylidene fluoride, 5-30 parts compatibilizer, 5-30 parts of a toughener, 0.05-1 part of an antioxidant and 0.05-5 parts of an ultraviolet absorber. The preparation method comprises the following steps: the polypropylene, polyvinylidene fluoride, the compatibilizer, the toughener, the antioxidant and the ultraviolet absorber are weighed according to the above formula ratio, and are added into a twin-screw extruder, and the obtained mixture is plasticized, is dispersed, and then undergoes extrusion granulation to obtain the polypropylene/polyvinylidene fluoride blended modified material. The ultraviolet radiation resistance quantity of the polypropylene/polyvinylidene fluoride modified material prepared in the invention can be increased by 3 times, or more, the outdoor service life of a tube made from the polypropylene/polyvinylidene fluoride modified material is prolonged to 2 times or more of the original service life, theoxygen permeability is reduced by 80%, and the polypropylene/polyvinylidene fluoride modified material also can be used in a -20 to 100 DEG C environment, so the application range is expanded.

Description

technical field [0001] The invention relates to the field of film technology, in particular to a polypropylene / polyvinylidene fluoride blend modified material and a preparation method thereof. The modified material has the advantages of excellent weather resistance, oxygen barrier, high and low temperature resistance, and the like. Background technique [0002] Polypropylene is widely used in construction, automobile, packaging, home appliances and other industries due to its low density, easy processing, corrosion resistance, high impact strength and excellent heat resistance. Among them, the pipes produced with random copolymerized polypropylene (PPR) as raw materials are widely used in water supply, gas, ore slurry transportation, chemical liquid transportation and other fields. [0003] However, PPR tubes also have the following problems: poor aging resistance, and the PPR molecular chain structure -(-CH2-CH-)n- contains a large number of unstable tertiary carbon atoms, ...

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Problems solved by technology

[0003] However, PPR tubes also have the following problems: poor aging resistance, and the PPR molecular chain structure -(-CH2-CH-)n- contains a large number of unstable tertiary carbon atoms, which are easily affected by light, oxygen, impurities (such as copper, iron ions, etc.) ) and aging; poor oxygen barrier performance, especially in water supply pipes, oxygen infiltrates into the inner pipe wall in contact with water, which can easily lead to the growth of microorganisms and algae, seriously affecting the sanitation of water quality; poor cold resistance, low low temperature impact strength, Cannot be used in low temperature environment

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