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Coated sodium percarbonate particle

A technology of sodium percarbonate and sodium carbonate, applied in the direction of peroxide/peroxy hydrate/peroxyacid/superoxide/ozonide, coating detergent composition, organic per/inorganic per compound composition, etc. , can solve the problem of borate intrusion, etc., and achieve the effect of improving safety

Active Publication Date: 2011-03-16
EVONIK TREIBACHER
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Problems solved by technology

[0007] A disadvantage of the sodium percarbonate granules with borate-containing coatings known from the prior art is that the coatings contain relatively large amounts of boron and therefore, in terms of the use of sodium percarbonate granules in detergent or cleaning compositions , there would be undesirably large amounts of borate entering the waste water obtained during use

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Embodiment Construction

[0058] Preparation of coated sodium percarbonate particles

[0059] For the preparation of coated sodium percarbonate granules, sodium percarbonate granules prepared by fluidized-bed packing granulation of aqueous hydrogen peroxide and sodium carbonate solutions according to the method described in EP-B 0 716 640 are used, the granules Has an average particle size of 0.78mm X 50 And less than 2% by weight of the fraction of fine particles smaller than 0.2mm. According to the method described in EP-B 0 863 842 paragraph [0021], by spraying a 20% by weight aqueous solution of the coating substance in a fluidized bed at a fluidized bed temperature of 55 to 60° C. and simultaneously evaporating the water, followed by The coating is applied to these particles by drying at a temperature not higher than 90° C. for 30 minutes. The weights of coating substances reported in weight percent in Table 1 are based on the total amount of coating substance sprayed and are calculated in the a...

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Abstract

The invention relates to coated sodium percarbonate particles, specifically sodium percarbonate particles with coating which comprise a coating layer containing moisture free sodium sulfate (70-99.8 wt.%) and sodium borate (0.2-2 wt.%), where the parts by weight of the coating layer is 1-10% relative to the mass of the sodium percarbonate particles. The sodium percarbonate particles exhibit high storage stability in detergent and cleaning agent preparations, due to a synergistic effect of sodium sulphate and sodium borate on storage stability, and at the same time have only a low boron content.

Description

technical field [0001] The present invention provides coated sodium percarbonate particles with high storage stability in detergent and cleaning compositions. Background technique [0002] Sodium percarbonate is increasingly used as a bleaching ingredient in detergent and cleaning compositions. For this application, sodium percarbonate must have sufficient storage stability in detergent and cleaning composition formulations, otherwise, during storage of detergent and cleaning compositions, an undesired loss of active oxygen occurs, resulting in The bleaching action is undesirably lost. Sodium percarbonate is sensitive to moisture and will decompose under the action of moisture in detergent and cleaning compositions with loss of active oxygen. Thus, for the preparation of detergent or cleaning compositions, sodium percarbonate is usually used in coated form, the coating of which prevents the action of moisture on the coated sodium percarbonate particles. Coatings of suitab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C11D3/39C11D3/02C11D17/00C11D3/12C01B15/10
CPCC11D3/3942C01B15/106C11D3/046C11D3/122C11D17/0039C11D3/39C11D17/00C11D3/02C01B15/10
Inventor S·莱宁格尔H·雅各布R·奥韦尔迪克
Owner EVONIK TREIBACHER
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