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Novel method of simply controlling particle sizes of ADC (azodicarbonamide) product

A new method and particle size technology, applied in the field of ADC foaming agent, can solve the problems of high energy consumption, increased energy consumption, unsatisfactory effect, etc., and achieve the effect of increasing the specific surface area and improving the dissolution rate

Inactive Publication Date: 2015-09-09
HANGZHOU HI TECH FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the synthesis process of biurea adopts kettle reaction. Generally, the particle size of biurea is between 50 and 150 μm, and it directly enters the oxidation section without any treatment. The particle size control of ADC products can only be adjusted by temperature. This leads to an increase in energy consumption, and the effect is not ideal. For ultra-fine products, subsequent processing such as jet crushing is required, which consumes a lot of energy.

Method used

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  • Novel method of simply controlling particle sizes of ADC (azodicarbonamide) product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, the biurea is pulverized so that the median particle size (d50) reaches Aμm respectively, and then it is configured with water to form a 300L slurry with a solid content of 30%, which is pumped into a 500L enamel oxidation kettle, and the mass of biurea is added. 0.8% sodium bromide is used as a catalyst, the stirring is started, and the stirring speed is 72rpm. Chlorine gas was introduced into the reactor to carry out the oxidation reaction, and the reaction temperature was controlled to be 28°C. After the reaction is finished, filter and wash the filter cake through a suction filter tank until the pH of the filter cake is 7, and take a sample for analysis after drying.

Embodiment 2

[0024] Firstly, biurea is pulverized so that the median particle size (d50) reaches Aμm respectively, and then it is prepared with dilute acid to form 300L of slurry with a solid content of 30%, pumped into a 500L enamel oxidation kettle, and added biurea Sodium bromide with 0.8% urea mass was used as a catalyst, and the stirring was started at a stirring speed of 72 rpm. Hydrogen peroxide was added dropwise into the reactor to carry out the oxidation reaction, and the reaction temperature was controlled to be 40°C. After the reaction is finished, filter and wash the filter cake through a suction filter tank until the pH of the filter cake is 7, and take a sample for analysis after drying.

[0025] The analysis data is as follows:

[0026]

[0027] According to the analysis results, it is shown that with the reduction of the particle size of biurea, the particle size of the ADC produced by the chlorine oxidation method and the hydrogen peroxide oxidation method are all red...

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Abstract

The invention discloses a novel method of easily controlling the particle sizes of an ADC (azodicarbonamide) product. The novel method comprises the specific step of adjusting the particle sizes of a foaming agent by adding aldehyde compounds when an oxidizing agent is used for oxidizing biurea, wherein the additive amount of the aldehyde compounds accounts for 0.1%-0.5% of mass of the biurea. The particle sizes of the foaming agent can be effectively reduced by adding the aldehyde compounds, thus greatly saving the subsequent treatment cost and improving the dispersity of the ADC foaming agent. The novel method has the beneficial effects that the novel method is simple, has no need of changing the traditional technologies and equipment and is relatively low in cost, the usability of the foaming agent can be improved, the subsequent treatment cost of the foaming agent is reduced, and the added value of the product is increased.

Description

technical field [0001] The invention relates to the technical field of ADC foaming agents, in particular to a new method for simply controlling the particle size of ADC products. Background technique [0002] ADC foaming agent (azodicarbonamide) is the most widely used general-purpose foaming agent in foam products. It is widely used in Plastic products such as polyethylene, polyvinyl chloride, polystyrene, polypropylene, ABS resin and EVA, and rubber products. [0003] At present, the synthesis process of biurea adopts kettle reaction. Generally, the particle size of biurea is between 50 and 150 μm, and it directly enters the oxidation section without any treatment. The particle size control of ADC products can only be adjusted by temperature. This leads to an increase in energy consumption, and the effect is not ideal. For ultra-fine products, subsequent processing such as jet crushing is required, which consumes a lot of energy. Contents of the invention [0004] The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C281/20C08J9/10
Inventor 陈海贤魏增徐智锋寿元军
Owner HANGZHOU HI TECH FINE CHEM
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