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Process for preparing coating sodium percarbonate

A technology of sodium percarbonate and sodium carbonate, applied in chemical instruments and methods, inorganic pigment treatment, fibrous fillers, etc., can solve problems such as reduced solubility, difficulty in achieving expected results in wet stability of sodium percarbonate, corrosion of stainless steel utensils, etc. , to achieve the effect of improving wet stability

Inactive Publication Date: 2008-10-22
陶华西
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The coating material of existing sodium percarbonate mainly comprises boric acid and its salt and phosphate, sodium sulfate and sodium chloride mixture etc., but through actual use one is because also the existence of boron element still can influence environment in the coating material , and the use of sodium chloride as the coating material will cause corrosion to stainless steel utensils; the second is that the wet stability of sodium percarbonate is still difficult to achieve the desired effect
[0005] Existing technology is also useful C 4 -C 12 Fatty acid is used as the coating material. Although the coated sodium percarbonate can achieve better results in terms of wet stability, its solubility is greatly reduced, which affects the use effect of sodium percarbonate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 1. Preparation of coating solution

[0018] Dissolve 1.0kg of sodium sulfate with 3.0kg of water completely, and set aside;

[0019] Add 1.0kg of sodium phosphate to 3.0kg of water to dissolve completely, then add 0.4kg of sodium silicate for later use.

[0020] 2. Coating process

[0021] Put 5.0kg sodium percarbonate in the laboratory fluidized bed, start the fluidized bed, spray the sodium sulfate coating solution evenly to the particle surface of sodium percarbonate through compressed air, control the flow rate of the coating solution, and the fluidized bed The air inlet temperature is controlled at 130-170°C, the bed temperature is controlled at 60-80°C, and when the dry weight of sodium sulfate accounts for 2.0% of the weight of sodium percarbonate, stop spraying the sodium sulfate coating solution and start coating sodium phosphate and Sodium silicate mixed coating solution, the control requirements are the same as the previous coating, the coating quantity is ...

Embodiment 2

[0023] The coating process is the same as in Example 1, and the dry basis weight of sodium sulfate, sodium phosphate, and sodium silicate is controlled to be 4.0%, 4.0%, and 1.6% of the sodium percarbonate weight respectively.

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Abstract

A process for prepared coated sodium peroxycarbonate includes coating one or two layers of coating liquid on the surface of sodium peroxycarbonate and drying. The said coating liquid is the mixture of alkali-metal sulfate (or phosphate) and alkali-metal silicate, and is used by spraying on fluidized bed composed of coating area and drying area. Its advantages are controllable content of active oxygen (12-14%), high wet stability (higher than 60%) and high dissolving speed.

Description

technical field [0001] The invention relates to a preparation method for coating sodium percarbonate, which belongs to the technical field of preparation of coatings in inorganic chemistry. Background technique [0002] Sodium percarbonate, the molecular formula is Na 2 CO 3 .1.5H 2 o 2 , a free-moving white particle produced by the reaction of soda ash and hydrogen peroxide. It is used as an oxygen-based bleach like sodium perborate, and has the functions of washing, sterilization, disinfection, and brightening. However, sodium percarbonate is used in household products. Detergents, especially when used together with 4A zeolite and layered disilicate, have great defects in wet stability. Although sodium perborate has good wet stability, it is caused by the presence of boron. The impact on the environment is limited in use. These two reasons have affected the development of oxygen-based detergents. [0003] In order to solve the wet stability of sodium percarbonate, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C3/06
Inventor 郑龙陶华西
Owner 陶华西
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