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Poly-hydroxyalkanoate degradable composite material containing carbon nanomaterial and preparation method

A technology of polyhydroxyalkanoate and nano-carbon material, applied in the field of composite materials, can solve the problems of slow crystallization speed, high haze of products, low crystallization speed, etc., and achieves improved processing performance and mechanical performance, high chemical stability properties and thermal stability, the effect of improving high temperature stability

Active Publication Date: 2015-05-20
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are many defects in the processing of PHA: low crystallization rate and low thermal conductivity, resulting in too long crystallization process; in conventional melt processing, the copolymer remains relatively viscous after cooling, resulting in the bonding of the processed product itself (such as blowing The molded films are bonded to each other) or bonded to processing equipment (such as injection molds, casting rolls, etc.); after processing, the material still shrinks and deforms for a long time, and the product quality and appearance decline, etc.
Although the problem of slow crystallization and residual viscosity in the process of PHBV processing and film formation has been solved, this method has harsh conditions and complicated processing technology
[0005] Chinese patent 200610157989.2 proposes to blend and modify PLA (polylactic acid) and PHA copolymer to improve the toughness and tear resistance of PLA, and to improve the processing methods of PHA in injection molding, blow molding, casting biaxial stretching, etc. The bonding problem in the material, but the degradable performance of the material is affected by it
[0006] Chinese patent 200980116454.2 proposes to increase crystallinity and crystallization rate by high-temperature molding or adding nucleating agents, but it will cause high haze to originally transparent products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh multi-walled carbon nanotubes with a diameter of 10-30mm and a length of 1-100μm and bag-type graphene with 1-6 layers and a diameter of 200-300nm according to a mass ratio of 1:4, and crush and mix the agglomerates through a jet mill . Weigh 5 g of the obtained mixture and add it to a mixture of 100 g of PHBV and 1 g of antioxidant tri-isooctyl phosphite, and heat to 50° C. for 20 min. The resulting mixture was put into a twin-screw extruder for extrusion, the feeding section was set at 130°C, the compression section was set at 155°C, the homogenization temperature was set at 145°C, the die temperature was set at 160°C, and the speed was controlled at 300RPM. The obtained PHA / NC composite material has good transparency, the tensile strength is 36.4MPa, and the thermal conductivity is 2.2W / m·K.

Embodiment 2

[0033] Add nano-carbon black with a diameter of 10-30 mm and a length of 1-100 μm with an average diameter of 40 nm into acetone at a mass ratio of 1:4, with a solid-to-liquid mass ratio of 1:49, and use a high-speed disperser with a stainless steel pulverizer at 8000 r / min The speed of shear dispersion is 60 minutes, and then ultrasonic dispersion is performed for 30 minutes with an ultrasonic disperser with a frequency of 40KHz, a power of 100W, and a volume of 3L. Take 8g of the obtained mixture, add 100g of PHBHx to the solvent and mix, and add binder and plasticizer tributyl citrate to make a slurry, flow the slurry from the hopper, cool it with a cooling roller, then dry and solidify at 80°C The product film is taken up from the base tape. A transparent PHA / NC film was obtained with a firm surface, no sticking phenomenon, and no obvious deformation after 1 hour.

Embodiment 3

[0035] Add single-walled carbon nanotubes with a diameter of <2 mm and a length of 5 to 15 μm and nano-graphite powder with an average diameter of 35 nm into absolute ethanol at a mass ratio of 4:1, and add 1 g of the above mixed powder to 200 g of absolute ethanol , add 1.5g of KH570, shear and disperse for 30min with a high-speed stainless steel pulverizer at a speed of 1200r / min, and then ultrasonically disperse for 30min with an ultrasonic disperser with a frequency of 40KHz, a power of 100W, and a volume of 3L. The mixed liquid was vacuum-dried at 80° C. for 6 hours to obtain a mixed powder of surface-grafted functionalized carbon nanotubes and graphene. Take 15g of the above mixed powder, stir and mix with 40gPHBV, 60gPHBO, 4g of lubricant glyceryl stearate, and 1g of antioxidant diisodecyl phosphite at 60°C, and add the obtained material to a planetary exhaust extruder to process the material Melt extrusion plasticization is carried out, and the operating temperature di...

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Abstract

The invention relates to a poly-hydroxyalkanoate degradable composite material containing a carbon nanomaterial and a preparation method thereof. The composite material is constructured by introducing a high thermal conductive carbon nanomaterial into a poly-hydroxyalkanoate matrix to form an efficient thermal conductive network in the composite material to accelerate dissipation of heat discharged by crystals. The carbon nanomaterial is used as a nucleating agent at the same time to promote nucleation and crystallization of the poly-hydroxyalkanoate matrix. The carbon nanomaterial is further used as a flexibilizer to strengthen the obtained composite material. The mass ratio of the poly-hydroxyalkanoate matrix to the carbon nanomaterial is 10:1 to 2000:1. Compared with the prior art, the carbon nanomaterial has the advantages of high machining property, high mechanical property and high thermal property, low production cost and the like.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a polyhydroxyalkanoate degradable composite material containing nano-carbon materials and a preparation method thereof. Background technique [0002] Polyhydroxyalkanoate (PHA) is a thermoplastic aliphatic biopolyester synthesized by prokaryotes as a carbon source and energy storage under the condition of carbon and nitrogen nutrition imbalance. Because the mechanical properties of PHA are similar to some thermoplastic materials such as polyethylene and polypropylene, but can be completely degraded into the natural biological cycle, it is considered to be a possible alternative to traditional non-degradable plastics synthesized from petroleum routes. Biodegradable plastic. The molecular structure of PHA is highly diverse, so its performance is also highly variable and controllable. The physical and mechanical properties of the polymer can be changed by ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/04C08K7/00C08K3/04C08K7/06C08K13/06C08K9/06
Inventor 李华刘河洲汪伟杰康红梅郗文灿陶文燕刘学发吴芬曾庆平
Owner SHANGHAI JIAOTONG UNIV
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