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A kind of polylactic acid conductive composite material and preparation method thereof
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A conductive composite material and conductive material technology, applied in the field of polylactic acid conductive composite material and its preparation, can solve the problems of unsatisfactory conductive performance of polylactic acid conductive composite material, poor mechanical properties and crystallization properties, etc., to improve mechanical properties and conductivity, improve crystallization performance, and accelerate crystallization
Active Publication Date: 2020-04-07
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology
However, the conductive properties of the polylactic acid conductive composite materials prepared so far are still unsatisfactory, and there are also problems of poor mechanical properties and crystallization properties.
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[0036] The present invention also provides a preparation method of the polylactic acid conductive composite material described in the above technical solution, comprising the following steps:
[0037] a) Melting and blending poly-L-lactic acid, poly-D-lactic acid and a conductive material to obtain a polylactic acid conductive composite material;
[0038] The melt blending temperature is higher than the melting point of poly-L-lactic acid and poly-D-lactic acid, and lower than the melting point of stereocomplex polylactic acid.
[0039] In the preparation method provided by the present invention, firstly, poly-L-lactic acid, poly-D-lactic acid and conductive materials are melt-blended in proportion. Wherein, the poly-L-lactic acid, poly-D-lactic acid and conductive materials are preferably dried before being melt-mixed; the drying temperature is preferably 70-120°C, specifically 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C or 120°C; the drying time is prefer...
Embodiment 1
[0044] Take by weighing 100 parts by weight of poly-L-lactic acid with a weight-average molecular weight of 100,000, 1 part by weight of carbon nanotubes (10 nanometers in particle diameter), 5 parts by weight of carbon black (100 nanometers in particle diameter), and 0.5 parts by weight of graphene (20 nanometers in particle diameter). Parts by weight, 20 parts by weight of poly-d-lactic acid with a weight-average molecular weight of 100,000; the above raw materials were mixed for 15 minutes at 160°C and 80 rpm, and cooled to room temperature after blending to obtain a polylactic acid conductive composite material.
Embodiment 2
[0046] Take by weighing 100 parts by weight of poly-L-lactic acid whose weight average molecular weight is 100,000, 1 part by weight of carbon black (50 nanometers of particle diameter), 2.5 parts by weight of nickel powder (150 nanometers of particle diameter), nickel-plated carbon fiber (300 aspect ratio, nickel Content 30wt%) 5 weight parts, weight average molecular weight is 15 weight parts of the poly-d-lactic acid of 100,000; The above-mentioned raw material is mixed 15min under the condition of 170 ℃, 80 revs / min, cools to room temperature after blending, obtains poly-lactic acid conductive composites.
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technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a polylactic acid conductive composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is an aliphatic polyester formed by fermenting starch extracted from renewable plant resources into lactic acid and further polymerized. It is one of the more active researched varieties of aliphatic polyester. The glass transition temperature and melting point of polylactic acid are about 60°C and 175°C, respectively. It is a hard polymer in a glass state at room temperature, and its thermal properties are similar to polystyrene. Polylactic acid is thermoplastic and can be molded on general-purpose processing equipment like synthetic polymers such as PP, PS, and PET. [0003] Polylactic acid material is a biodegradable material, which is buried in the soil after use, and will naturally decompose into water and carbon dioxide after a c...
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