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High-conductivity polymer carbon nanotube composite material and micro-processing method thereof

A carbon nanotube, composite material technology, applied in liquid crystal materials, chemical instruments and methods, medical science, etc., can solve the problems of high shear rate, fast injection molding or extrusion rate, uneven distribution of conductivity of polymer materials, etc. , to achieve the effect of simple process and convenient operation

Inactive Publication Date: 2011-07-06
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in the micro-injection molding of polymer / carbon nanotube nanocomposites: due to the small size of the micro-processing flow channel, the surface body of the mold cavity is relatively large, the injection molding or extrusion rate is fast, and the shear rate is high.
The temperature gradient is high in time and space, the micro-melt has less heat, and the cooling rate is extremely fast, which makes the conductive network of micro-injection molding easily damaged. How to improve the conductivity of micro-injection products and reduce the conductive percolation threshold of micro-injection products It is a huge challenge; at the same time, the high shear gradient and high temperature gradient of microfabrication lead to differences in the conductive network structure of microfabricated products, which in turn makes the conductivity distribution of polymer materials uneven
How to improve the uniformity of electrical conductivity of micro-injection molded products is another great challenge

Method used

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  • High-conductivity polymer carbon nanotube composite material and micro-processing method thereof
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  • High-conductivity polymer carbon nanotube composite material and micro-processing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] Extrude 270g of polyurethane pellets and 30g of multi-wall carbon nanotubes with an average diameter of 15nm and a length of about 800nm-5μm through a twin-screw extruder to pelletize once, and control the three-stage processing temperature to 185°C, 195°C , 195°C, rotation speed 120rpm, after processing, carbon nanotubes and polymers form tightly combined pellets. After vacuum drying at a temperature of 100°C, 200g of this pellet and 200g of polyurethane pellets are extruded again through a twin-screw extruder Granulate once, control the three-stage processing temperature at 185°C, 195°C, 195°C, and rotate at 120rpm. The second twin-screw extruded pellets are placed at room temperature for 3 days and then vacuum-dried at 100°C to remove moisture for micro Injection molding, micro-injection plasticizing temperature is 210°C, micro-injection pressure is 77Mpa, injection time is 10s, holding pressure is 20Mpa, and holding time is 10s. After obtaining micro-injection produc...

Embodiment 2

[0040] Extrude 270g of polyethylene pellets, 15g of multi-walled carbon nanotubes with an average diameter of 20nm and a length of about 800nm-5μm, 5g of p-phenylenediamine, and 10g of hexadecyltrimethylammonium bromide through twin-screw extrusion The extruder was extruded and granulated once, and the three-stage processing temperatures of the twin-screw extruder were 185°C, 195°C, and 195°C, respectively, and the rotation speed was 120rpm. After processing, the carbon nanotubes and the polymer formed tightly combined pellets. Place the pellets at room temperature for 3 days, then vacuum-dry them at 100°C to remove moisture for micro-injection molding. The time is 10s, the temperature of the ceramic mold is 25°C, the micro-injection samples are placed at room temperature for 3 days and then annealed at 180°C for 1.5h, and the electrical conductivity is 30S.m -1 .

Embodiment 3

[0042] 27g of polypropylene pellets, 1.5g of multi-walled carbon nanotubes with an average diameter of 20nm and a length of about 800nm-5μm, 0.8g of 2,6-tertiary butyl-4-methylphenol, and ethylene-acrylic acid copolymer 0.7g, extrude and granulate twice through a micro extruder, the micro extrusion temperature is 195°C, the screw speed is 120rpm during the first extrusion, and the residence time is 1min, the screw speed is 500rpm during the second extrusion, and the residence time For 5s, the pellets with carbon nanotubes and polymer tightly combined were obtained. Place the pellets at room temperature for 3 days and then vacuum-dry them at 100°C for micro-injection molding. The micro-injection temperature is 200°C, the micro-injection pressure is 77MPa, the injection time is 10s, the holding pressure is 20Mpa, and the holding time is 50s, the temperature of the ceramic mold is 50°C, the product is placed at room temperature for 3 days and then non-isothermal heat treatment is...

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Abstract

The invention discloses a high-conductivity polymer carbon nanotube composite material and a micro-processing method thereof. The invention is characterized in that the method comprises the following steps: adding 50-99.95 parts of polymer grain or powder, 0.05-20 parts of carbon nanotube, 0-15 parts of antioxidant and 0-15 parts of dispersant into a micro-extruder, a double-screw extruder or a double-screw extruder / micro-extruder combined facility, extruding at a screw rotation speed of 20-500rpm at a polymer melting or softening temperature of Tm+10 DEG C-Tm+80 DEG C for 1-3 times to obtainuniformly dispersed composite material grains, and carrying out micro extrusion, micro injection or micro compaction on the grains to prepare a high-conductivity micro product; or carrying out isothermal or non-isothermal heat treatment on the product in a baking oven with a temperature of Tm-80 DEG C-Tm+20 DEG C for 5 seconds to 1.5 hours; or carrying out after-treatment on the sample in microwaves, infrared rays or plasma. The high-conductivity polymer carbon nanotube composite material disclosed by the invention is used for preparing micro biomedical devices in minimally invasive operations, and used in the field of micro biomedical sensors, micro electronics, micro electro-mechanics or micro-robots.

Description

technical field [0001] The invention relates to a high-conductivity polymer carbon nanotube composite material and a micro-processing method thereof. It belongs to the field of polymer processing. Background technique [0002] The development of modern science and technology and the national economy urgently requires miniature, lightweight, precise, high-performance, multi-functional micro-devices and micro-systems. Grooves, high-strength, dimensionally stable, self-lubricating micro-gears, micro-devices with electrical, magnetic, and optical functions, micro-medical devices with biocompatibility, drug sustained release, and organ repair functions, etc. The products have high technological content, high added value, and wide application, involving communication, electronics, biomedical, micro-electromechanical and many other fields, and have formed a large industry with an annual output value of tens of billions of dollars. The key is to develop products with target functio...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L25/06C08L27/06C08L23/12C08L59/02C08L33/12C08L33/08C08L67/04C08L71/08C08L77/02C08L77/06C08L55/02C08L61/16C08L67/02C08L69/00C08L75/04C09K19/38C08K13/04C08K7/00C08K3/04B29C45/76B29C47/92B29C43/58B29C71/02A61L31/12B29C48/92
CPCB29C48/02B29C48/92B29C2948/92561B29C2948/92704B29C2948/92895B29C2948/92971
Inventor 夏和生菲尔寇茨李东旭费国霞龚启春
Owner SICHUAN UNIV
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