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Graphenic carbon particle co-dispersions and methods of making same

A technology of olefinic carbon particles and graphene carbon, which is applied in the field of co-dispersion, can solve the problem that graphene carbon particles are difficult to disperse

Active Publication Date: 2017-05-10
PPG IND OHIO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene carbon particles have been found to be difficult to disperse in various media such as organic solvents and water

Method used

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  • Graphenic carbon particle co-dispersions and methods of making same
  • Graphenic carbon particle co-dispersions and methods of making same
  • Graphenic carbon particle co-dispersions and methods of making same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] The compositions summarized in Table 1 were dispersed by adding 70 g of the following compositions to an 8 oz glass jar with 220 g of SEPR Ermil 1.0-1.25 mm grinding media. All compositions were formulated to contain 60.95 g of N-methyl-2-pyrrolidone, 7.0 g of total graphene carbon particles, and 2.05 g of a solvent-borne block copolymer dispersant (comprising 43% by weight n-butyl acetate and 57% by weight % block copolymers disclosed in US 2008 / 0188610). The samples in the jar were shaken for 4 hours using a Lau disperser (model DAS 200, Lau, GmbH). After shaking, the dispersion was diluted with additional N-methyl-2-pyrrolidone and the grinding media was filtered off. The P / B (pigment to binder ratio) in each composition was 6.

[0079] Table 1

[0080] Dispersions

[0081] Sample: A B C D E F G H I J ％M-25 0 100 100 90 85 80 75 70 60 50 %TGC 100 0 0 10 15 20 25 30 40 50 %TS 6.0 10.7 8.6 8.7 8.3 8.2 8.2...

Embodiment 2

[0084] Sample A from Table 1 containing only TGC graphene carbon particles was mixed with Sample B from Table 1 containing only M-25 graphene carbon particles at different ratios listed in Table 2 below. Each mixture was prepared by adding the appropriate amount of each sample together to a glass jar and stirring vigorously with a paddle until thoroughly mixed. The P / B for each of the resulting compositions was 6.

[0085] Table 2

[0086] mixture

[0087] Sample: 1 2 3 4 5 6 7 8 9 10 11 12 13 ％M-25 98 96 94 92 90 88 86 84 82 80 70 60 50 %TGC 2 4 6 8 10 12 14 16 18 20 30 40 50

Embodiment 3

[0089] Specimens C to J from Table 1 and Specimens 1 to 13 from Table 2 were taken as 1-2 mm wide lines using a dispensing nozzle (PICO valve, MV-100, Nordson, EFD) and a tabletop robot (2504N, Janome). The serpentine circuit pattern was applied to 2 x 3 inch glass slides (Fisherbrand, Plain, Precleaned) and then dried in an oven at 212°F for 30 minutes. Conductivity is determined by first measuring the resistance of the serpentine circuit versus the length of the circuit wire. Then, the cross-sectional area of ​​the serpentine line was measured using a pin profiler (Dektak). Using measurements of the cross-sectional area (A) and electrical resistance (R) for a given length (L) of the circuit, resistivity (ρ) is calculated using the equation ρ=RA / L. Conductivity (σ) was then calculated by taking the reciprocal of resistivity σ=1 / ρ. The conductivity results are shown in Table 3, expressed in units of Siemens / meter.

[0090] table 3

[0091] Conductivity

[0092]

[0093...

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Abstract

Co-dispersions of different types of graphenic carbon particles are produced using a polymeric dispersant. A portion of the graphenic carbon particles may be thermally produced. The polymeric dispersant may include an anchor block comprising glycidyl (meth)acrylate, 3,4-epoxycyclohexylmethyl(meth)acrylate, 2-(3,4-epoxycyclohexyl)ethyl(meth)acrylate, allyl glycidyl ether and mixtures thereof, reacted with a carboxylic acid comprising 3-hydroxy-2-naphthoic acid, para-nitrobenzoic acid, hexanoic acid, 2-ethyl hexanoic acid, decanoic acid and / or undecanoic acid. The polymeric dispersant may also include at least one tail block comprising at least one (meth)acrylic acid alkyl ester.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application Serial No. 14 / 100,064, filed December 9, 2013, and a continuation-in-part of U.S. Patent Application Serial No. 14 / 348,280, filed March 28, 2014, which are hereby incorporated by reference enter. [0003] field of invention [0004] The present invention relates to graphene carbon particle co-dispersions and methods of making such co-dispersions. [0005] Background of the invention [0006] Graphene carbon particles have many potential uses, for example in inks and coatings. However, graphene carbon particles have been found to be difficult to disperse in various media, such as organic solvents and water. Ethylcellulose has been used as a dispersion aid in an attempt to improve the dispersion of graphene carbon particles. However, improved dispersions of graphene carbon particles are needed to improve the properties of inks and coatings and other m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/194H01B1/04C09D7/45
CPCH01B1/04C01P2006/40C01P2006/12C01P2006/11C01P2004/62C01P2004/64C01P2004/54C01B2204/04C01P2002/01C01P2004/24C01P2004/04C01P2002/82H01B1/24C08K2201/011C08L33/14C08L33/068C08K3/042C09D7/45C09D5/24C09D7/65
Inventor E·L·戴克C·B·内蒂格N·R·瓦尼尔洪正宏
Owner PPG IND OHIO INC
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