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Fiber reinforced polymeric composites with tailorable electrical resistivities and process for preparing the same

A fiber-reinforced, composite material technology, used in nanotechnology, nanotechnology, etc.

Active Publication Date: 2015-07-08
国防研究与发展组织总指挥部 (DRDO)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of these prior art solutions has addressed the problem of conventional structural-grade composite laminates having a sufficiently wide range of surface resistivity properties (10 9 to 10 -1 Ω / sq.) to make it universal for most relevant applications
Each route has pros and cons

Method used

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  • Fiber reinforced polymeric composites with tailorable electrical resistivities and process for preparing the same
  • Fiber reinforced polymeric composites with tailorable electrical resistivities and process for preparing the same
  • Fiber reinforced polymeric composites with tailorable electrical resistivities and process for preparing the same

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[0017] The present invention relates to a method for the preparation of fiber reinforced polymer (FRP) composites with adjustable surface resistivity, the method comprising the operation of uniformly mixing 1 to 30% by weight of a conductive filler in a matrix resin system to obtain a resin mixing; wetting the dry preform with the resin mixture; pressing the wet preform to obtain a green composite; curing the green composite; and post-curing the cured composite for making a fiber reinforced polymer composite.

[0018] In one embodiment of the present invention, the filler is selected from the group comprising conductive carbon black, silver coated hollow glass microspheres and carbon nanotubes.

[0019] In one embodiment of the present invention, wherein the conductive carbon black is uniformly and manually mixed in the matrix resin in a weight range of about 1% to about 10% by weight of the resin mixture.

[0020] In one embodiment of the present invention, wherein the silver...

Embodiment 1

[0053] Example 1 : The surface resistivity is on the order of 10 7 Ω / sq. FRP composite material (anti-static application)

[0054] Raw materials: The matrix used to make composite materials is a room temperature curing epoxy resin (phenolic base (phenolic system, novolac based)) - cycloaliphatic amine curing agent system (100:38 by weight). Conductive carbon black powder (ENSACO 250G from M / s Timcal, Belgium) was used as functional filler. The carbon black powder used in these composites has a maximum particle size of 45 microns, a pour density of 0.135 g / cc, and a volume resistivity of less than 10 Ω-cm.

[0055] Method: Carbon black powder (0.5 gm, 5 wt% of the resin system) was added to epoxy resin (7.25 gm) at room temperature and stirred manually until a homogeneous mixture was obtained. Thereafter, curing agent (2.75 gm) was added to the mixture and mixed thoroughly to obtain a homogeneous mixture. This mixture was used to laminate the top 2 plies (7 mil PW glass fa...

Embodiment 2

[0063] Example 2 : The surface resistivity is on the order of 10 2 FRP composites in Ω / sq. (space clothes)

[0064] Raw materials: The matrix used to make the composite is a room temperature curing epoxy resin (phenolic based)-cycloaliphatic amine curing agent system (100:38 by weight). Multi-walled CNTs (N-7000 from M / sNanocyl, Belgium) were used as functional fillers. The multi-walled CNTs (75% pure) used in these composites have diameters from 2 to 15 nm, lengths from 100 to 2000 nm, and 5 to 20 concentric shells.

[0065] Method: Add carbon nanotubes (0.3gm, 3wt% of the resin system) into epoxy resin (7.25gm) at room temperature and disperse for 2 minutes with a 10,000rpm shear homogenizer. Thereafter, curing agent (2.75 gm) was added to the mixture and mixed thoroughly to obtain a homogeneous mixture. This mixture was used to laminate the top 2 layers (7mil PW glass fiber cloth) of 100mm x 100mm size GFRP laminate. Laminates were vacuum bagged and cured at room temp...

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Abstract

The present invention relates to polymer composite materials, more particularly relates to composite materials with tailor made surface electrical resistivities in the range of 109 to 10−1 Ω / sq. and process of making the same. The process for preparing Fiber Reinforced Polymeric (FRP) Composite, said process comprising acts of homogeneously mixing 1-30% by weight of different electrically conducting fillers in matrix resin system to obtain resin mix; wetting dry preforms using the resin mix; compacting the wetted preforms to obtain green composite; curing the green composite; and post-curing the cured composite to prepare the FRP Composite.

Description

technical field [0001] The present disclosure relates to polymer composites, and more particularly to composites with tailor made electrical properties, and methods of making the same. Background technique [0002] Conventional fiber-reinforced polymers (FRPs) offer material designers very limited latitude in terms of the required resistivity of their surfaces. Whereas glass FRP (GFRP) provides a highly insulating surface (surface resistivity >10 9 Ω / sq.), the surface of carbon FRP (CFRP) is more conductive (surface resistance ≈ 10 0 Ω / sq.). However, the prior art does not allow these FRP materials to be tuned at any user-specified intermediate surface resistivity value. This technique can help to achieve this in conventional glass or carbon reinforced thermoset polymer based composites, where, depending on the specific requirements of the end use, the surface resistivity value can be tuned to any given order of magnitude in the range of 10 9 Ω / sq. to 10 -1 Ω / sq. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/88B29C70/02
CPCB29K2995/0005B29C70/025Y10S977/742B29C70/882B29K2105/165B29K2105/167B29K2309/08B29K2063/00B29K2707/04B29K2105/16Y10S977/779Y10S977/842
Inventor 萨姆德拉·达斯古普塔麦迪谢蒂·纳拉亚南·拉奥·贾格迪施·库马尔桑达拉姆·桑卡兰
Owner 国防研究与发展组织总指挥部 (DRDO)
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