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Preparation method of carbon nano tube (CNT)/polylactic acid (PLA) electromagnetic shielding composite material with isolation structure

A composite material and electromagnetic shielding technology, which is applied in the field of preparation of carbon nanotube/polylactic acid isolation structure conductive polymer composite materials, can solve many problems, and achieve the effect of high conductivity, wide sources and excellent conductivity

Inactive Publication Date: 2015-11-11
SICHUAN UNIV
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  • Application Information

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Problems solved by technology

At present, there are not many patents on the preparation of CPCs for electromagnetic shielding with non-petroleum-based polymers, and there are no reports on the successful use of CNTs in PLA to prepare isolation structural composite materials with high electromagnetic shielding effectiveness

Method used

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  • Preparation method of carbon nano tube (CNT)/polylactic acid (PLA) electromagnetic shielding composite material with isolation structure
  • Preparation method of carbon nano tube (CNT)/polylactic acid (PLA) electromagnetic shielding composite material with isolation structure
  • Preparation method of carbon nano tube (CNT)/polylactic acid (PLA) electromagnetic shielding composite material with isolation structure

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Embodiment 1-10

[0034] The process steps adopt:

[0035] (1) Drying of raw materials: Dry CNT in an oven at 80°C until the moisture content is lower than 0.01%; dry PDLA and PLLA in a vacuum oven at 60°C for more than 24h until the moisture content is lower than 0.01%.

[0036] (2) Preparation of PLA microparticles: PDLA and PLLA were added to a Haake torque rheometer, and mixed at 40 rpm and 180° C. for 10 min to obtain PLA microparticles.

[0037] (3) Preparation of conductive composite particles: Weigh the PLA particles obtained in (2) and dry CNTs in (1) according to a certain mass ratio (see Figure 8 ) placed in a high-speed mixer, mixed for 3 minutes at a stirring speed of 24,000 rpm, and kept at a temperature not exceeding 60° C. during the mixing process to achieve uniform coating of PLA particles by CNTs.

[0038] (4) Compression molding: Preheat the composite material particles mixed in (3) at a temperature of 190-220°C for 10 minutes, then hot-press at 10MPa for 5 minutes, and fi...

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Abstract

The invention discloses a preparation method of a carbon nano tube (CNT) / polylactic acid (PLA) electromagnetic shielding composite material with an isolation structure. The composite material is mainly prepared from the following raw materials in percentage by weight: 49.5 to 49.975 percent of poly-l-lactic acid (PLLA), 49.5 to 49.975 percent of poly-d-lactic acid (PDLA) and 1 to 0.05 percent of CNTs. The preparation technology is as follows: (1) raw material drying; (2) preparation of PLA particulates; (3) preparation of CNT / PLA conductive composite particles; (4) compression molding. According to the method, non-petroleum based PLA which belongs to one of biodegradable plastics is taken as a base body of the electromagnetic shielding composite material, the CNTs with excellent electrical properties are taken as a electromagnetism functional filler, the isolation structure is built by utilizing the selective distribution of CNTs on the surfaces of the PLA particulates, and the composite material with high electromagnetic shielding property is obtained under ultralow CNT content. The PLA particulates can be obtained by only mixing the PLLA and the PDLA in a torque rheometer, and the final electromagnetic shielding material is prepared through mechanical mixing and compression moulding; the preparation process is simple, no organic solvent is needed, the aims of going green and environmental protection are realized and industrial production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of preparation of conductive polymer composite materials, in particular to the preparation of carbon nanotube (hereinafter referred to as CNT) / polylactic acid (hereinafter referred to as PLA) isolation structure conductive polymer composite materials. Background technique [0002] Electromagnetic radiation not only causes electromagnetic interference to electrical equipment, but also harms human health. With the rapid development of electronic equipment, the problem of electromagnetic pollution is becoming more and more serious. Therefore, the research and development of electromagnetic shielding materials has become an important topic of increasing concern in academia and industry. Compared with traditional metal shielding materials, conductive polymer composites (CPCs) have the advantages of light weight, easy processing, corrosion resistance and greatly adjustable performance, and have become a new type o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K7/24C08K3/04
Inventor 鄢定祥崔成华贾利川李忠明
Owner SICHUAN UNIV
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