Metal dispersion with increased stability
A dispersion and metal technology, applied in metal/alloy conductors, metal processing equipment, colloid chemistry, etc., can solve the problems of industrial scale reproduction, high dispersant load, etc., and achieve the effect of good electrical conductivity and good electrical conductivity
Inactive Publication Date: 2018-07-31
CLARIANT INT LTD
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Problems solved by technology
Thus, for example, the process described cannot be reproduced on an industrial scale or the granules produced have an extremely high dispersant loading
If the particles are to be rendered electrically conductive, sintering is only carried out at relatively high temperatures of at least 140°C and is therefore not suitable for use on temperature-sensitive polymeric substrates
Method used
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[0062] The synthesis of the copolymer was carried out in the following manner: In a flask with stirrer, reflux cooler, internal thermometer and nitrogen inlet, in the weight fractions given in the table below, the formula (1 ) polyglycol and the acrylic monomer of formula (2) and a molecular weight regulator. The temperature was then brought to 80° C. with stirring and the initiator solution was metered in within one hour. It was stirred at this temperature for another two hours. Further additives can then be metered in. The following table summarizes the composition of the copolymers.
[0063]
[0064]
[0065] Preparation of metal nanoparticles:
[0066] Nanoscale metal particles are prepared in a continuous manner similar to paragraphs [0027] to [0056] of document EP-2010314 in a micro-reaction device. The metal particle sol obtained here is purified by means of membrane filtration and concentrated to a metal content of 50-80% by weight. A dispersant content of 1...
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Abstract
The invention relates to metal dispersions containing 50 to 80 wt.% of silver nanoparticles, 15 to 45 wt.% of water, and a dispersant, said dispersant containing copolymers that contain 1 to 99 wt.% of structural units of the formula (1), in which R represents hydrogen or C1-C6-alkyl, A represents C2-C4 alkaline groups, and B represents C2-C4 alkaline groups, with the proviso that A differs from B, and m, n independently of each other represent a whole number from 1 to 200, and 1 to 99 wt.% of structural units of the formula (2), in which Xa represents an aromatic or aliphatic group with 1 to30 C atoms, said group optionally containing one or more heteroatoms, for example 1, 2, or 3 heteroatoms, of N, O, and S, Za represents H or (C1-C4)-alkyl, Zb represents H or (C1-C4)-alkyl, and Zc represents H or (C1-C4)-alkyl.
Description
technical field [0001] The present invention relates to the use of copolymers stabilized with metal particle sols having a metal particle content of 50 to 80% by weight. [0002] Metal particles in the sense of the present invention include nanoparticles and submicron particles. In the sense of the present invention, nanoparticles are defined as particles smaller than 100 nm in at least one dimension. Microparticles are particles that are between 1 μm and 1000 μm in size in all three dimensions. Submicron particles are defined as particles larger than 100 nm in all three dimensions and smaller than 1 μm in at least one dimension. A sol or colloid is a dispersion of nanoparticles or submicron particles in a liquid. [0003] Important criteria for the properties and fields of application of nanoscale and submicron-sized metal particles are, inter alia, average particle size, particle size distribution, colloidal chemical stability of dispersions, processing properties and phy...
Claims
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IPC IPC(8): B01J13/00B22F1/0545C09K23/52
CPCB01J13/0034B01J13/0043B22F1/0545H01B1/02B22F2301/255B82Y30/00B82Y40/00C08L33/06C09D5/24
Inventor A·罗什C·莎夫尔
Owner CLARIANT INT LTD