Bleaching agent particles comprising sodium percarbonate and a bleach activator

A bleach activator, sodium percarbonate technology, applied in the directions of detergent compounding agent, peroxide/peroxyhydrate/peroxyacid/superoxide/ozone, organic per/inorganic per compound composition, etc., It can solve the problems of silo storage obstacles, non-storage, caking, etc.

Inactive Publication Date: 2013-01-02
EVONIK TREIBACHER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, prior art bleach granules comprising sodium percarbonate and a bleach activator have the disadvantage that they exhibit self-heating during storage due to the decomposition of sodium percarbonate or the reaction of sodium percarbonate with the bleach activator, This is in such large quantities that they cannot be stored in silos for safety reasons
Furthermore, these prior art bleach granules also have the disadvantage that they tend to agglomerate during storage, which is likewise a hindrance for silo storage

Method used

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  • Bleaching agent particles comprising sodium percarbonate and a bleach activator
  • Bleaching agent particles comprising sodium percarbonate and a bleach activator
  • Bleaching agent particles comprising sodium percarbonate and a bleach activator

Examples

Experimental program
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Effect test

Embodiment 1

[0067] The experiments were carried out in a Mycrolab fluidized bed coater from OYSTAR Hüttlin equipped with a 1 l product container and a three-component nozzle mounted from the bottom, and by subatmospheric pressure in the fluidized bed and 80 °C 35m 3 / h(STP) air is operated as fluidizing gas.

[0068] The binder used was sodium polyacrylate with an average molecular weight of 1900 g / mol in the form of a 45% by weight aqueous solution. The bleach activator used was TAED from Wfk, which was ground in a mortar and mortar, and coarse particles were removed from the bleach activator by sieving through a sieve with a mesh size of 200 μm.

[0069] 400 g of coated sodium percarbonate was filled into a preheated fluid bed coater and heated to a fluid bed temperature of 45°C. Then, the binder solution was sprayed into the fluidized bed through a three-component nozzle at a spraying rate of 3.75 g / min and a spraying pressure of 0.8 bar, resulting in a fluidized bed temperature of 5...

Embodiment 2 to 4

[0072] In each case TAED AC white from Clariant was comminuted at 40 g / portion in a laboratory mill of type A10 from Ika for 30 seconds. 400 g of coated sodium percarbonate were placed in a food processor from Braun, model K3000 type 3210, equipped with a stainless steel container and kneading tools, and at maximum speed, the amount of binder indicated in Table 1 was mixed. Added dropwise, and at the same time, 200 g of pulverized TAED were added at 20 g / portion. When the addition is complete, a further 2 minutes of mixing is carried out, and the mixture is introduced by suction into a fluidized bed coater from OYSTAR Hüttlin, model Mycrolab, equipped with a 1 l product container and built-in from below and having the structure described in DE3806537A1 Two-component nozzle and 35Nm at subatmospheric pressure in the fluidized bed and through 80°C 3 Air at / h[STP] was used as fluidizing gas for operation. Once the temperature in the fluidized bed had increased to 60°C, 250 g o...

Embodiment 5

[0075] Example 2 was repeated, except that 34 g of an aqueous sodium silicate solution with a concentration of 10% by weight and a factor of 3.3 were sprayed through the same nozzle at the same spray rate after spraying the sodium sulfate solution and before post-drying in the fluidized bed.

[0076]

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Abstract

The invention relates to bleaching agent particles, comprising a core made of sodium percarbonate, an inner enveloping layer containing at least 50 wt % of sodium sulfate in the form of thenardite or burkeite and an outer enveloping layer, containing a water-soluble binder and a perhydrolyzable N-acyl compound or O-acyl compound as the bleach activator, wherein said particles are storage-stable, suitable for silo storage and can be safely transported and handled even in a hot and humid climate.

Description

technical field [0001] The present invention relates to bleach granules comprising sodium percarbonate and a bleach activator and having high storage stability. Background technique [0002] Sodium percarbonate is used as a bleaching agent in cleaners and detergents. When detergents are used, hydrogen peroxide is released from sodium percarbonate as the bleach active component. In order to enhance the bleaching effect at low temperatures, bleaching systems in which sodium percarbonate is used together with a bleach activator are often used in detergents. Bleach activators for this use are generally N-acyl compounds and O-acyl compounds, which contain one or more perhydrolyzable acyl groups bonded to nitrogen or to oxygen, said compounds being compatible with detergents Hydrogen peroxide liberated from sodium percarbonate in aqueous solution reacts to produce peroxycarboxylic acid. In addition to perhydrolysis, hydrolysis also occurs, yielding the corresponding carboxylic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C11D3/02C11D3/39C11D17/00
CPCC11D3/3917C01B15/106C11D17/0039C11D3/3942C11D3/391C11D3/02C11D3/39C11D17/00
Inventor S·莱宁格尔H·雅各布R·奥韦尔迪克
Owner EVONIK TREIBACHER
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