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Porous magnesia and process for preparing the same

A technology of porous magnesium oxide and oxide, applied in the field of base pigment, to achieve the effect of easy disintegration, strong deodorization effect and good sliding property

Inactive Publication Date: 2009-03-11
MERCK PATENT GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Among the above-mentioned chemical deodorizing methods, no substance has been found to effectively remove malodorous substances such as acidic low fatty acids constituting body odor, vinyl ketone components constituting stale odor, and basic amines
Moreover, these known techniques fail to provide a satisfactory sensory experience when applied to the human body

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0059] The preparation method of the substantially spherical particles used in the present invention to provide the matrix includes: separately preparing an aqueous solution of magnesium salt (and other metal salts when compounded with it) and either an aqueous alkali solution or an aqueous carbonate solution, and simultaneously removing the aqueous solution Add dropwise to the separately heated hot water while stirring and stabilize the pH in the range of 7.5 to 11, preferably 8.0 to 10.5. In this process, the hot water before the dropwise addition preferably has an adjusted sulfate ion concentration, especially when the alkaline aqueous solution is used for the dropwise addition as described above. The reaction temperature used in the present invention is preferably not lower than 50°C, and from the viewpoint of easy formation of spherical particles, it is preferably in the range of 70°C to 90°C. In the dropwise addition step, the metal salt aqueous solution and the alkali aqueo...

Embodiment 1

[0077] Heat six liters of deionized water to 80°C with stirring. Then, 5600g aqueous solution was added dropwise at the same time, of which 160g potassium sulfate, 40g sodium sulfate and 1400g magnesium sulfate (MgSO 4 ·7H 2 O) Dissolve in 4000 g of water, and maintain the pH at 9.5 with a 15 wt% sodium carbonate aqueous solution. After the dropwise addition of these aqueous solutions was completed, heating and stirring were stopped, and the mixture was allowed to stand for 16 hours. Take out 10 liters of supernatant from the mixture and add 3 liters of water. Heat to 80°C with stirring, and add 1200g of 5.6% sodium silicate aqueous solution dropwise at the same time, and use dilute hydrochloric acid (1:2, that is, use twice the volume of water). Dilute concentrated hydrochloric acid, the same below) to keep the pH at 9.3. After the dropwise addition was completed, dilute hydrochloric acid (1:2) was further added dropwise to obtain a suspension with pH 8.5. The suspension was filt...

Embodiment -2

[0079] Under stirring, 1.8 liters of deionized water was heated to 80°C. Then, 1480g of aqueous solution was added dropwise at the same time, of which 40g of potassium aluminum sulfate (KAlSO 4 ·9H 2 O) and 240g magnesium sulfate (MgSO 4 ·7H 2 O) Dissolve in 1200 g of water, and maintain the pH at 8.5 with a 15 wt% sodium carbonate aqueous solution. After the dropwise addition of these aqueous solutions was completed, heating and stirring were stopped, and the mixture was allowed to stand for 16 hours. Take out 1.5 liters of supernatant, and then heat to 80° C. with stirring, while adding a 5.6% sodium silicate aqueous solution dropwise to maintain the pH at 8.0 with dilute hydrochloric acid (1:2). After the dropwise addition, dilute hydrochloric acid (1:2) was further added dropwise to make the pH of the suspension 6.5. The suspension was filtered, washed with deionized water, dried at 110°C, and calcined at 500°C to obtain substantially spherical porous magnesium oxide composite...

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Abstract

The present invention relates to porous magnesia of substantially spherical shape having a silica layer, which may be used as a carrier for deodorants, antibacterials, catalysts, slow action agents (the adsorbent having the possibility of decreasing the effect of the co-administered medicines or fertilizer and plastic additives, and body pigments.

Description

Technical field [0001] The present invention relates to a substantially spherical porous magnesium oxide with a silica layer, which can be used as a deodorant, an antibacterial agent, a catalyst, a slow action agent (the adsorbent has the ability to reduce the co-application of drugs or fertilizers). The possibility of the effect) and the carrier of plastic additives, as well as the base pigment. Background technique [0002] As porous materials, porous magnesium oxide (Patent Document 1) and basic magnesium carbonate (Patent Document 2) are known. Porous magnesium oxide has applications in sintered bodies suitable for furnace materials and sheath materials, and basic magnesium carbonate has applications in various fillers, rubber filling materials, pesticides and catalyst carriers, cosmetics and others. [0003] In recent years, due to the extreme heat caused in part by the effects of global warming, the demand for deodorizing products for removing unpleasant sweat odors has inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/02C01F5/06A61K8/19A61K8/18A61K8/11C09C1/02A61Q15/00
CPCA61Q15/00A61K8/19A61K8/11C01P2004/45C09C1/028C01F5/02C01P2004/61C01F5/06A61K2800/412A61P25/24A61K8/18
Inventor 野口民生渡边幸隆佐佐木富美子
Owner MERCK PATENT GMBH
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