Polylactic acid/clay nanocomposite material and its preparation method and method for preparing foamed products

Abstract

The invention discloses a polylactic acid / clay nanocomposite material, which is made of the following components in weight percentage: 75-98% of polylactic acid resin, 1-10% of organically modified nano-clay, and 0.1-5% of compatibilizer %, foam retaining agent 0.1-5%, and additives 0.1-5%, organically modified nanoclay is nanoclay organically modified with cationic surfactant. The invention also discloses a preparation method of the polylactic acid / clay nanocomposite material, which is simple in preparation, can be realized by using the existing equipment screw extruder, easy to implement and control, and easy to industrialized large-scale production. The invention also discloses a method for preparing a foamed product by using polylactic acid / clay nanocomposite material, which has a high foaming ratio and is extruded by a physical foaming agent to form a foamed product with a ratio of 5 to 80 times, and the foamed product has good mechanical properties , can be used in packaging materials, cushioning materials, thermal insulation and other applications, safe, non-toxic, and biodegradable.

Description

technical field [0001] The invention relates to the field of foamed products, in particular to a polylactic acid / clay nanocomposite material, a preparation method thereof, and a method for preparing foamed products. Background technique [0002] Foam plastic is a high polymer / gas composite material with superior performance, which has excellent properties such as light weight, impact energy absorption, heat insulation and sound insulation. However, traditional foam plastics such as polyethylene, polypropylene, polystyrene, etc. are made of non-renewable petroleum resources, and they can hardly be decomposed in the natural environment after use. After incineration, a large amount of toxic and harmful substances are produced, causing environmental pollution. . In order to solve these problems, there is an urgent need for a foam plastic that can have similar properties to traditional foam plastics and can be completely biodegradable. [0003] Polylactic acid (PLA) is a biodeg...

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Problems solved by technology

[0015] Although the above prior art can improve the foaming performance of polylactic acid, because the melt strength of polylactic acid is not greatly improved, the problems of foaming agent dissipation and cell collapse are prone to occur in the foaming process, so it is difficult to Obtaining a material with a foaming ratio higher than 20 times cannot give full play to the advantages of light weight, low cost, and good heat insulation of the foamed material

Using nanoclay to modify polylactic acid to form a nanocomposite material to improve the melt strength of the material, and then extruding and foaming with a physical foaming agent has not been reported in a patent

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