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Continuous grinding method for brominated flame retardant and grinding machine for realizing method

A technology of brominated flame retardants and grinding methods, which is applied in the field of grinding machines, can solve problems such as equipment corrosion, increase product production costs, and long grinding time, so as to avoid the impact of product quality, reduce the impact of product quality, and reduce particle size. The effect of small diameter distribution range

Inactive Publication Date: 2013-05-01
SHANDONG TIANYI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of jet milling, some brominated flame retardants will be oxidized by oxygen in high-temperature air and deteriorate, which will affect the use effect and appearance of the product
The existing wet grinding method is to disperse the brominated flame retardant in water first, and then send it into the grinder for grinding. After one batch of materials is ground, the next batch of materials is ground. The product volume of each batch is 500 Between -1000 kg, that is, intermittent grinding, continuous production cannot be carried out; because brominated flame retardants volatilize highly corrosive hydrogen bromide or bromine during the grinding process, it will cause corrosion to the equipment and shorten the service life short, increases the production cost of the product, and also causes inconsistent colors between product batches. In addition, the grinding speed is low, the grinding time is long, the efficiency is backward, the particle size of the product is large, the energy consumption of the process is high, and the product quality is poor, which seriously affects It hinders the use of downstream customers and hinders the application of brominated flame retardants in high-quality engineering plastics

Method used

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  • Continuous grinding method for brominated flame retardant and grinding machine for realizing method
  • Continuous grinding method for brominated flame retardant and grinding machine for realizing method

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Experimental program
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Effect test

Embodiment 1

[0031] According to the mass ratio relationship of decabromodiphenylethane: sodium sulfite: sodium carbonate: process water=1000:5:5:500, the above-mentioned materials are added into the mixer 15 and mixed to obtain a mixed material liquid; 16. The mixed material liquid is continuously fed into the grinder from the bottom of the grinder 17 for grinding; the feeding speed is controlled so that the mixed material liquid that enters the grinder later pushes the mixed material liquid that enters first to move upwards and the bottom layer It takes 4 hours for the mixed material liquid to flow out from the overflow port on the top of the grinder. In other words, it takes 4 hours for the mixed material liquid to flow out from the overflow port after entering the bottom of the inner cavity of the grinder. machine, the overflow feed liquid also continuously flows out from the overflow port; the overflow feed liquid flows through the iron remover 18 to remove ferromagnetic substances, th...

Embodiment 2

[0033] According to the mass ratio relationship of decabromodiphenylethane: hydrazine hydrate: sodium bicarbonate: process water=1000:5:10:1000, the above-mentioned materials are added into the mixer 15 and mixed to obtain a mixed material liquid; The feeding pump 16 continuously feeds the mixed material liquid from the bottom of the grinder into the grinder for grinding; the feeding speed is controlled so that the mixed material liquid that enters the grinder last pushes the mixed material liquid that entered first to move upwards and the bottom layer The mixed material liquid flows out from the overflow port on the top of the grinder after 0.6 hours. Grinding machine, the overflow material liquid also continuously flows out from the overflow port; the overflow material liquid flows through the iron remover 18 to remove ferromagnetic substances, then enters the buffer tank 19, and then is sent from the buffer tank 19 by the feed pump 21 Enter the filter press 20 to carry out ...

Embodiment 3

[0035] According to the mass ratio relationship of decabromodiphenyl ether: thiourea dioxide: potassium carbonate: process water=1000:15:10:2000, the above-mentioned materials are added into the mixer 15 and mixed to obtain a mixed material liquid; 16 Feed the mixed material liquid from the bottom of the grinder continuously into the grinder for grinding; control the feeding speed so that the mixed material liquid that enters the grinder later pushes the mixed material liquid that enters first to move upwards and makes the bottom layer of the mixed material liquid It takes 0.2 hours for the material liquid to flow out from the overflow port on the top of the grinder. In other words, it takes 0.2 hours for the mixed material liquid to flow out from the overflow port after entering the bottom of the inner cavity of the grinder. Because the mixed material liquid continuously enters the grinder , the overflow feed liquid also continuously flows out from the overflow port; the overf...

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Abstract

The invention discloses a continuous grinding method for a brominated flame retardant, which comprises the following steps: (1) after uniformly mixing the brominated flame retardant, a reducing agent, a pH regulator and process water, obtaining mixed feed liquid; (2) continuously feeding the mixed feed liquid into a grinding machine for grinding through the bottom of the grinding machine, controlling a feeding speed, and causing the later mixed feed liquid entering into the grinding machine to drive the earlier mixed feed liquid entering into the grinding machine to move upward till flowing out of an overflow port at the top of the grinding machine, wherein the liquid continuously flowing from the overflow port is overflow feed liquid; and (3) after removing ferromagnetic materials from the overflow feed liquid through an iron-removing machine, performing solid-liquid separation, washing the obtained solid material with water and drying, and then obtaining the powdered brominated flame retardant with the grain size in a preset scope. The obtained product has the advantages of good color and luster, uniform grain size of the product, small size distribution scope and stable quality.

Description

technical field [0001] The invention relates to a continuous grinding method of a brominated flame retardant and a grinding machine for realizing the method. Background technique [0002] With the popularization of plastics, rubber, resins, etc. in daily life, the human demand for flame retardants is increasing, and it has become a fine additive used in plastics, rubber, and resins, second only to plasticizers. Chemicals, among which bromine series flame retardants account for about 40% of the total demand for flame retardants. [0003] Additive brominated flame retardants generally require a particle size below 5 microns. At present, there are two main ways to pulverize brominated flame retardants, one is airflow pulverization, and the other is wet grinding. During the process of jet milling, some brominated flame retardants will be oxidized by oxygen in the high-temperature air and deteriorate, which will affect the use effect and appearance of the product. The existing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C17/16B02C17/10B02C17/18
Inventor 唐星三孟烨李茂桉高玉章孙跃明董勇
Owner SHANDONG TIANYI CHEM
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