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Production of silver sulfate grains

A silver sulfate, particle technology, applied in sulfate preparations, skin care preparations, silver compounds, etc., can solve problems such as limited description

Inactive Publication Date: 2009-05-13
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Despite the various references to silver salts as antimicrobials in various fields as cited above, there is little in the prior art regarding the preparation of silver salts with sufficiently small grain sizes and optimum grain sizes as required for a particular application. Methods of distribution of silver salts especially silver sulfate, the description of which is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-21

[0042] Examples 1-21: Precipitation of silver sulfate particles

[0043] In Examples 1-21, thermal decolorization assays were performed by heating 1-2 g of air-dried samples of the indicated materials in small Petri dishes (5.5 cm diameter) in a Barnstead International 48000 oven. Typically, the sample is heated from 125°C to 260°C with 10' holds at 125, 175, 230 and 260°C. Partial samples showing minimal discoloration at 260°C were heated to 300°C and higher. Samples were removed from the oven as soon as they showed significant discoloration. Visually characterize sample decolorization.

Embodiment 1

[0044] Embodiment 1: comparative example, no additive, sulfuric acid

[0045] 2 L of distilled water was added to a 6 L stainless steel sponge kettle, and the temperature was controlled at 10°C. A previously described planar mixing device (Research Disclosure 38213, February 1996 pp111-114 "Mixer for Improved Control Over Reaction Environment") operating at 3000 rpm was used to ensure homogeneity of the reactor contents. Add 180 mL of 8M H to this reactor 2 SO 4 solution. The resulting pH<1. A peristaltic pump was used to deliver 639 mL of a solution containing 3M silver nitrate at a rate of 225 mL / min, resulting in precipitation of a white product after about 20 s. The measured pH was about 1. The reaction was maintained at 10°C for 10 min. The final product was washed to a conductivity <10 mS and partially dried at room temperature. Powder X-ray diffraction confirmed that the product was single-phase silver sulfate. The average grain size was determined by light scat...

Embodiment 2

[0046] Embodiment 2: comparative example, without additive, sodium sulfate

[0047] Add 2 L of distilled water into a 6 L stainless steel sponge pot, and control the temperature at 10°C. Reactor contents were mixed as described in Example 1. Add 780 g of Na to this reactor 2 SO 4 10H 2 O (Aldrich, 99+%) and dissolved. The resulting pH was 6.6. A peristaltic pump was used to deliver 1278 mL of a solution containing 3M silver nitrate at a rate of 225 mL / min, resulting in precipitation of a white product after about 25 s. The measured pH was 4.2. The reaction was maintained at 10°C for 10 min. The final product was washed to a conductivity <10 mS and partially dried at room temperature. The average grain size was determined by light scattering (HORIBA) to be 62 μm. Thermal decolorization analysis of the dry product showed that it started to change from white to yellow after about 5 min at 230°C.

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Abstract

An aqueous precipitation process for the preparation of particles comprising primarily silver sulfate, comprising reacting an aqueous soluble silver salt and an aqueous soluble source of inorganic sulfate ion in an agitated precipitation reactor vessel and precipitating particles comprising primarily silver sulfate, wherein the reaction and precipitation are performed in the presence of an aqueous soluble organo-sulfate or organo-sulfonate additive compound, the amount of additive being a minor molar percentage, relative to the molar amount of silver sulfate precipitated, and effective to result in precipitation of particles comprising primarily silver sulfate having a mean grain size of less than 50 micrometers.

Description

technical field [0001] The present invention relates to the production of silver sulfate particles prepared by the aqueous phase precipitation method, and in particular, micron-sized silver sulfate particles prepared in a uniform particle size using organic sulfate or organic sulfate additives, and their use as antibacterial agents in polymeric materials. antiviral and antiviral agents. + Background technique [0002] There are many uses for silver sulfate, including synthetic reagents; a source of silver in the preparation of catalysts, plastic composites, and various platinum complexes; and a source of silver in some photosensitive methods. More recently, silver sulfate has been added to plastics and face creams as an antimicrobial and antiviral agent. To meet the demands of more modern applications, it is often necessary to reduce the particle size of materials to the micron and nanometer size ranges to take advantage of the higher surface area, surface energy, reactivi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G5/00C01B17/96C08K3/24
CPCA61Q17/005C01G5/00A61K8/23C09C1/00A01N59/16C01P2004/61
Inventor D·W·桑德富德T·N·布兰顿
Owner EASTMAN KODAK CO
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