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Peroxygen release compositions and method for producing them

A technology for releasing compositions, compositions, used in textile bleaching and industrial applications, disinfection, pharmaceuticals, personal care, cleaning, and can solve problems such as poor storage stability

Inactive Publication Date: 2015-02-18
CREACHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Nevertheless, peroxygen bleaching systems based on sodium percarbonate or sodium perborate found in powder detergents exhibit poor storage stability in liquid aqueous detergent formulations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0080] With magnetic stirring and gentle heating to 30 °C, 200 g Na 2 SO 4 Dissolve in 500ml of 27.5% hydrogen peroxide (technical grade, pH=2.5). At the same time, 200g calcium chloride dihydrate (CaCl2 .2H 2 O) Dissolve in another volume of 500 ml 27.5% hydrogen peroxide. When the two salts were completely dissolved, the two clear solutions were poured together and a white precipitate immediately began to form, indicating crystallization of calcium sulfate. The dispersion was stirred at room temperature for 3 hours. The dispersion was then divided into two portions of 500 ml each. To remove excess liquid, a portion of the dispersion was placed on filter paper with a maximum pore size of 5 μm and allowed to concentrate overnight. The second portion of the dispersion was centrifuged at 2500xg for ten minutes. Both methods of concentration produced thickened paste-like dispersions. A total of 650 g of a thickened dispersion with a pH value of 2 was obtained. The concent...

Embodiment 2

[0087] The composition obtained from Example 1 was divided into aliquots of 50 g. For each aliquot, the pH was varied by addition of HCl and NaOH, and the stability of the composition was investigated over a wide pH range.

[0088] Table 2 : Stability of the composition at different pH values

[0089] pH value

[0090] At pH 0.5 and pH 10, gas bubbles started to escape from the dispersion, which indicated the decomposition of reactive oxygen species. The composition was found to be stable at least in the range of pH 2-8.

Embodiment 3

[0092] 100 g of sodium sulfate was dissolved in 500 ml of 7% hydrogen peroxide (pH=3) by magnetic stirring and slight heating to 30 °C. At the same time, 100 grams of calcium chloride dihydrate (CaCl 2 .2H 2 O) Dissolve in another 500 ml volume of 7% hydrogen peroxide. When the two salts were completely dissolved and the two clear solutions were poured together, a white precipitate immediately began to form, indicating crystallization of calcium sulfate. The white dispersion was stirred at ambient temperature for 2 hours. Samples were taken at regular intervals and the crystal size studied microscopically. Within the first minute, the crystals were in the range of 10 microns. After 2 hours, the average length of the crystals had reached about 150 microns, as estimated by the microscope, compared with the graduated scale markings. Aggregation may have occurred at this stage. The crystals were needle-shaped, and some plate-like structures were observed. To remove excess l...

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PUM

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Abstract

Stabilized peroxygen containing compositions are disclosed, both in thickened viscous form and in dry form. The compositions contain newly synthesized calcium sulfate crystals that function as a thickener and stabilizing agent against metal-catalyzed decomposition. The invention discloses a composition comprising 0.5 wt % to about 50 % wt of hydrogen peroxide, 2.0 wt % to about 80.0 % wt of newly synthesized calcium sulfate crystals, being of individual sheet or needle shape, and water, said composition having a viscosity of about 200 cP to about 20,000 cP. The invention further provides a process for making same, comprising the reaction of a water soluble calcium containing salt with sulfuric acid or a salt thereof in an aqueous hydrogen peroxide solution at a reaction temperature of up to 80 °C in a mixing apparatus, followed by a concentration step in order to thicken into a stable viscous dispersion or paste containing at least 2 wt % and preferably 10 wt % to 15 wt % of CaSO 4 . The compositions are suitable for use as disinfectants, as cleaning agents, and in a variety of personal care, pharmaceutical, textile bleaching and industrial applications.

Description

technical field [0001] The invention relates to the fields of disinfection, cleaning, personal care, pharmaceuticals, textile bleaching and industrial applications. Background technique [0002] Hydrogen peroxide is a widely used and environmentally friendly oxidizing agent, hand sanitizer and disinfectant. Hydrogen peroxide is a liquid, which makes it convenient for use in a wide variety of drifting applications. Hydrogen peroxide is a weak acid and thus dissociates slightly in aqueous solution (Equation 1). [0003] Reaction Equation 1 [0004] Liquid hydrogen peroxide is an important ingredient in many cleaning, sanitizing and sanitizing formulations in industries such as food processing, industrial / institutional cleaning, consumer products, medical and healthcare, and in agriculture. Typically, the active ingredient hydrogen peroxide is combined with alcohols, foaming agents, thickeners, fragrances, emulsifiers, surfactants, and / or ammonium salts in the final applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B15/037C01F11/46D06L4/12D06L4/13
CPCC01P2004/10C11D7/10C01B15/037C11D3/046C01F11/46C01P2004/20C01P2006/22C11D3/3937C11D3/3947C11D7/02C11D3/122C01P2004/61D06L4/12D06L4/13A01N25/04A01N25/22A01N59/00C11D3/3902C11D3/3942
Inventor F·莱凯W·德温特
Owner CREACHEM
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