Method for preparing high thermal conductivity chopped carbon fiber reinforced polymer-based resistance welding unit

A chopped carbon fiber and resistance welding technology, which is applied in the field of preparation of high thermal conductivity chopped carbon fiber reinforced polymer-based resistance welding unit, can solve the problems of overshoot, uneven heating, overheating, etc., and achieve simple preparation process and improved thermal conductivity , the effect of expanding the scope of application

Inactive Publication Date: 2012-09-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional resistance welding units often hav

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Ultrasonic dispersion of 10g of graphene microflakes and 2g of chopped carbon fibers with a length of 6mm for 4h, suction filtration, drying, then adding 1g of stearic acid and stirring evenly, mixed with 39g of polypropylene (PP) matrix in an internal mixer at 170 o C. Mixing for 10 minutes under the condition of 40r / min, using a mold with a size of 1.4mm×5mm×20mm, at 190 o C. Press the tablet for 8 minutes under the condition of 12MPa, and then put the pressed tablet in a 1mm×5mm×25mm mold, leave a gap of 2.5mm in length between the two ends of the sheet and the mold end, and add 6mm in the gap between the two ends. Chopped carbon fiber, at 190 o C. Press the tablet under the condition of 12MPa for 5 minutes. After the workpiece is cooled, grind it with sandpaper until the chopped carbon fibers at both ends are exposed to obtain a welded unit. The resistance value of this welding unit is 10 2 Order of magnitude, the thermal conductivity is 5 times that of polypropyl...

Embodiment 2

[0019] 5g of graphene microflakes and 5g of chopped carbon fibers with a length of 3mm were ultrasonically dispersed for 8h, filtered with suction, dried, then added with 0.5g of stearic acid and stirred evenly on the surface, and mixed with 42g of polyethylene matrix in an internal mixer at 180 o C. Mixing for 10 minutes under the condition of 40r / min, using a mold with a size of 1.4mm×5mm×20mm, at 180 o C. Press the tablet under the condition of 12MPa for 8 minutes, and then put the pressed tablet in a 1mm×5mm×25mm mold. Leave a gap of 2.5mm between the two ends of the sheet and the mold end, and add 5mm in the gap between the two ends. polycrystalline iron fiber, at 180 o C. Press the tablet under the condition of 12MPa for 5 minutes. After the workpiece is cooled, grind it with sandpaper until the polycrystalline iron fiber is exposed to obtain a welded unit. The resistance value of this welding unit is 10 2 Order of magnitude, the thermal conductivity is 4 times that of...

Embodiment 3

[0021] 15g of graphene microflakes and 5g of chopped carbon fibers with a length of 6mm were ultrasonically dispersed for 8h, filtered with suction, dried, then added with 0.5g of sodium dodecylsulfonate and stirred evenly, and mixed with 29g of ethylene-vinyl acetate copolymer matrix 80 in the refining machine o C. Mixing for 10 minutes under the condition of 40r / min, using a mold with a size of 1.4mm×5mm×20mm, at 80 o C. Press the tablet under the condition of 12MPa for 8 minutes, and then put the pressed sheet in a 1mm×5mm×25mm mold, leave a gap of 2.5mm between the two ends of the sheet and the mold end, and add carbon nanotubes to the gap at both ends, at 80 o C. Press the tablet under the condition of 12MPa for 5 minutes. After the workpiece is cooled, grind it with sandpaper until the carbon nanotubes are exposed to obtain a welded unit. The resistance value of this welding unit is 10 1 Order of magnitude, the thermal conductivity is 8 times that of the ethylene-viny...

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Abstract

The invention discloses a method for preparing a high thermal conductivity chopped carbon fiber reinforced polymer-based resistance welding unit. The method comprises the following steps of: mixing graphene micro tablets and chopped carbon fiber in water with ultrasonic dispersion and adding a surfactant for uniformly mixing after drying; placing the mixture and thermoplastic resin to an internal mixer for mixing and pressing into a sheet in a die; and placing the sheet in a die the length of which is larger than that of the sheet, respectively adding a conducting material in clearances of both ends of the sheet and the end of the die, performing hot pressing, and grinding both ends of the sheet after demoulding so that the conducting material is exposed outside to be used as an energized electrode of the welding unit. The method is simple in preparation process, high thermal conductivity graphene micro tablets are adopted, phenomena of overburning and overshooting existing in resistance welding are avoided so that a weld is uniformly heated, the mechanical property and the conductive property of the welding unit are improved due to that the carbon fiber is added, and the resistance value of a weld assembly is at 102-101 orders of magnitude.

Description

technical field [0001] The invention relates to a preparation method of a high thermal conductivity chopped carbon fiber reinforced polymer base resistance welding unit. Background technique [0002] Thermoplastic composite fusion bonding (Fusion Bonding) technology mainly refers to the method of locally melting the resin matrix in the thermoplastic composite material to be connected by a certain heating method, and then cooling and solidifying to a connection structure with a certain mechanical strength. The fusion joining technology of thermoplastic composites has similarities with the welding process of metal materials in principle, so it is also called the welding technology of thermoplastic composites customarily. Compared with traditional mechanical riveting and gluing technology, the biggest advantage of thermoplastic composite welding technology is its strong versatility, short process cycle (usually only tens of seconds to a few minutes), high connection strength, a...

Claims

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Application Information

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IPC IPC(8): B29C43/18B29B7/00C08L23/06C08L23/12C08L27/16C08L77/00C08L25/06C08L33/12C08L59/02C08L67/02C08L23/08C08K13/04C08K7/06C08K3/04
Inventor 沈烈汪文丁宏亮曹清华张子宽
Owner ZHEJIANG UNIV
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