Polypropylene/polylactic acid/starch composite material and preparation method thereof

Abstract

The invention discloses a polypropylene / polylactic acid / starch composite material which is prepared from the following ingredients by weight percent: 15-30% of polypropylene, 35-50% of polylactic acid, 20-35% of diisocyanate modified starch, 5-10% of vegetable oil multi-element alcohol and 5-10% of compatilizer. According to the polypropylene / polylactic acid / starch composite material, polypropylene, polylactic acid, diisocyanate modified starch, the vegetable oil multi-element alcohol and the compatilizer are combined together to generate better interfacial compatibility, and the ingredients bring the synergistic effect into play, so that the polypropylene / polylactic acid / starch composite material has excellent mechanical properties, can be used for preparing a film, disposable tableware and the like, and belongs to degradable biological materials. The invention further discloses a preparation method of the polypropylene / polylactic acid / starch composite material. The preparation method is simple, easy to control, strong in operability, low in production cost and easy for industrial production.

Description

technical field [0001] The invention relates to the field of plastic materials, in particular to a polypropylene / polylactic acid / starch composite material and a preparation method thereof. Background technique [0002] The plastic industry has developed rapidly, and its use has penetrated into various fields of the national economy, and its use is very extensive. China produces about 5 million tons of waste plastics every year, most of which are polypropylene (PP), polyethylene (PE) and polystyrene (PS) materials, which cannot be decomposed naturally. Therefore, if the disposable plastic packaging waste made of PP material, PE material and PS material and its corresponding agricultural film and disposable tableware are randomly discarded, they will be piled up on the land due to their non-degradability, causing serious damage. White pollution, and this potential pollution will also intensify with the increase of people's usage and the accumulation of time. At present, my cou...

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Problems solved by technology

Although the mechanical properties of the PLA / starch composite obtained in this way are greatly improved, the presence of polyols in the PLA matrix can easily degrade the PLA matrix or migrate to the surface of the material, resulting in a significant increase in the mechanical properties of the composite after a period of storage. decline

[0006] According to the review, it can be seen that the methods currently used to improve the mechanical properties of polylactic acid / starch composites have problems of low efficiency and durability, which is not conducive to the preparation of a PLA / starch composite with long-lasting and stable properties.

[0007] The Chinese invention patent application with the application publication number CN102634073A discloses a starch / polypropylene degradable composite material and its preparation method, which consists of 50% to 70% by weight of starch, 5% to 15% of vegetable oil plasticizer , 15% to 30% polypropylene or modified polypropylene and 5% to 30% compatibilizer raw materials, the compatibility of starch and polypropylene is improved through the compatibilizer, and the starch is treated with vegetable oil plasticizer Plasticization, the performance of plasticized starch is stable, which improves the mechanical properties (main toughness and impact resistance) of starch / polypropylene degradable composites, but its mechanical properties are still not ideal and need to be further improved

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