High strength and high heat resistance polylactic acid composite material and preparation method thereof

Abstract

The invention relates to a high performance polylactic acid composite material and a preparation method. The high performance polylactic acid composite material comprises the following components in parts by mass: 40-85 parts of polylactic acid, 10-40 parts of modified inorganic or natural fibres; 1-10 parts of organic modified natural minerals, 0.8-5 parts of sensitizing agents, 0.1-2 parts of heat stabilizers, 0.1-1 part of antioxygen and 0.1-1 part of lubricating agent. The inorganic or natural fibre reinforced polylactic acid is selected to improve the mechanics performance, silane coupling agents are adopted to carry out surface processing to improve the compatibility with the polylactic acid matrix; and organic modified natural minerals are selected to improve the crystallization rate of the polylactic acid, also improve the material performance, reduce energy source consumption, and reduce the cost of products. After heat processing is carried out, the heat resistance and the mechanics performance of the composite material are further improved through the radiation crosslinking of crystallized polylactic acid. The prepared polylactic acid composite material has excellent mechanical property and heat resistance, and can avoid the problem of property reduction caused by a single modification method. The method is simple. The composite material can be prepared through the traditional plastic processing methods. The invention is suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a high-performance polylactic acid composite material including high strength and high heat resistance and a preparation method thereof, which can broaden the application range of polylactic acid. Background technique [0002] Polylactic acid is an eco-environmental polymer material obtained through chemical synthesis using corn as raw material. Its production and use process belongs to the normal carbon cycle in nature and will not increase the carbon dioxide content in the atmosphere. In today's serious greenhouse effect, the development of green Plastics are especially important. At the same time, discarded polylactic acid products can be buried in the soil and decomposed into hydrated carbon dioxide through the action of microorganisms without causing white pollution. With the increasing shortage of petroleum resources, the development of non-petroleum ...

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Problems solved by technology

Chinese patent application 200810241328.7 uses glass fiber to reinforce polylactic acid, which improves the mechanical properties of polylactic acid material, but glass fiber contributes little to the heat resistance of polylactic acid, so polylactic acid reinforced only by fiber cannot be used as an engineering plastic at a high level use at temperature

Chinese patent applications 200710049685.9 and 200810050603.7 both use radiation crosslinking to improve the heat resistance of polylactic acid, but the polylactic acid material prepared by this method is prone to deformation under external force and cannot be used as an engineering plastic

[0006] Chinese patent application 20071055475.0 utilizes radiation crosslinking and fiber composite to synergistically modify polylactic acid, but this method is only for amorphous polylactic acid materials and does not involve crystalline polylactic acid

[0008] At present, the cost of polylactic acid is still high, which limits the large-scale application of polylactic acid. Inorganic minerals can not only reduce the cost of polylactic acid products, but also increase the crystallization rate of polylactic acid and reduce the energy consumption of the processing process.

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