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

A composite material, polylactic acid technology, applied in high-performance polylactic acid composite materials, high strength and high heat resistance and its preparation field, can solve the problem of limiting the large-scale application of polylactic acid, the small contribution of polylactic acid heat resistance, polylactic acid materials Deformation and other problems, to achieve the effect of low impact strength, low equipment requirements, and improve impact resistance

Inactive Publication Date: 2011-02-02
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 cann

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Glass fiber modification process: by weight, take 15 parts of glass fiber, 75 parts of toluene, and 1 part of γ-glycidyl etheroxypropyl trimethoxysilane coupling agent, and carry out batching, under the protection of nitrogen, at 70 ° C Stirring and mixing at low temperature, and then reflux for 3 hours; after suction filtration and washing, dry at 100°C to obtain modified glass fibers.

[0048] Talc powder modification process: by weight, take 15 parts of talc powder, 75 parts of toluene, and 1 part of γ-glycidyl etheroxypropyl trimethoxysilane coupling agent, and carry out batching, under the protection of nitrogen, at 70 ° C Stirring and mixing at low temperature, and then reflux for 3 hours; after suction filtration and washing, dry at 100°C to obtain modified talc powder.

[0049] The semi-crystalline poly-L-lactic acid was vacuum-dried at 40°C for 6 hours; the modified glass fiber and modified talcum powder were vacuum-dried at 120°C for 6 hours. Get 40 parts of ...

Embodiment 2

[0051] Glass fiber modification process: by weight, take 15 parts of glass fiber, 75 parts of toluene, and 1 part of γ-glycidyl etheroxypropyl trimethoxysilane coupling agent, and carry out batching, under the protection of nitrogen, at 70 ° C Stirring and mixing at low temperature, and then reflux for 3 hours; after suction filtration and washing, dry at 100°C to obtain modified glass fibers.

[0052] Barite modification process: by weight, take 15 parts of barite, 75 parts of toluene, and 1 part of γ-glycidyl etheroxypropyl trimethoxysilane coupling agent, and carry out batching, under the protection of nitrogen, in Stir and mix at 70°C, and then reflux for 3 hours; after suction filtration and washing, dry at 100°C to obtain modified barite.

[0053] The semi-crystalline poly-L-lactic acid is vacuum-dried at 40°C for 6-12 hours; the modified glass fiber and modified barite are vacuum-dried at 120°C for 6 hours. Take 40 parts of poly L-lactic acid, 3 parts of modified barit...

Embodiment 3

[0055] Quartz glass fiber modification process: by weight, take 15 parts of quartz glass fiber, 75 parts of toluene, and 1 part of γ-glycidyl etheroxypropyl trimethoxysilane coupling agent, and carry out batching, under the protection of nitrogen, in Stir and mix at 70°C, and then reflux for 3 hours; after suction filtration and washing, dry at 100°C to obtain modified quartz glass fibers.

[0056] Talc powder modification process: by weight, take 15 parts of talc powder, 75 parts of toluene, and 1 part of γ-glycidyl etheroxypropyl trimethoxysilane coupling agent, and carry out batching, under the protection of nitrogen, at 70 ° C Stirring and mixing at low temperature, and then reflux for 3 hours; after suction filtration and washing, dry at 100°C to obtain modified talc powder.

[0057] The semi-crystalline poly-L-lactic acid was vacuum-dried at 40°C for 6 hours; the modified quartz glass fiber and modified talc powder were vacuum-dried at 120°C for 6 hours. Get 40 parts of...

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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 ...

Claims

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Application Information

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IPC IPC(8): C08K7/04C08K3/34B29C45/78C08K7/14B29C35/10C08L97/02C08K13/06C08J5/06C08J3/24C08L67/04C08K9/06C08K7/06B29B9/06C08J3/28B29C47/92B29C48/92
CPCB29C48/04B29C48/92B29C2948/92704B29C2948/92895
Inventor 尹静波范寅清蔡艳华顾超颜世峰陈学思
Owner SHANGHAI UNIV
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