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Organic surface processing method of titanium dioxide for plastics

A technology of surface treatment and titanium dioxide, which is applied in the treatment of dyed organosilicon compounds and fibrous fillers, etc., can solve the problems of affecting the site environment and workers' health, high production costs, and large dust, so as to facilitate the promotion and implementation and reduce COD value, the effect of solving pollution problems

Inactive Publication Date: 2018-03-23
QINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0025] Commonly used titanium dioxide organic coating agents for plastics are mainly siloxanes and silanes. Since the polarity of silane organic coating agents is too low, if the dosage is insufficient during use, titanium dioxide will disperse in the plastic. If the dosage is too much, it will cause a lot of dust in the process of packaging or use, which will seriously affect the site environment and the health of workers. Therefore, more companies choose siloxanes as the organic coating agent of titanium dioxide for plastics.
[0026] At present, the organic surface treatment process of titanium dioxide for plastics will produce a large amount of organic matter discharge, which will be condensed into the sewage system after being separated by the bag filter, and the COD content of the condensed water discharged at present exceeds 1,000,000, which directly affects the COD index of the discharged water. Some Enterprises solve the COD problem of discharged condensate water by setting up expensive aeration and other environmental protection measures, which in turn leads to high production costs and complicated process control

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Produce titanium dioxide product A for plastics according to the following method:

[0043] (1) Inject siloxane and desalted water into the vacuum mixer at a mass ratio of 1:2, and raise the temperature of the system to 90°C by electric heating, control the stirring shear rate to 3000r / min, and stir for 5 minutes Stirring was stopped to obtain an oil-water dispersion system.

[0044](2) Start the base material feeding equipment of the flat jet mill, transport the post-treatment drying material to the pulverization cavity of the jet pulverizer, and open the organic treatment agent feeding pipe at the same time, so that the above-mentioned oil-water dispersion system enters the pulverization cavity for further processing. Jet milling and organic coating, the interval time from the moment when the stirring is stopped to the time when the oil-water dispersion system enters the pulverizing chamber of the jet mill and completely contacts with the post-treatment drying materia...

Embodiment 2

[0048] Produce titanium dioxide product B for plastics according to the following method:

[0049] (1) Inject siloxane and desalted water into a vacuum mixer at a mass ratio of 1:4, and raise the temperature of the system to 80°C by electric heating, control the stirring shear rate to 3200r / min, and stir for 10 minutes Stirring was stopped to obtain an oil-water dispersion system.

[0050] (2) Start the base material feeding equipment of the flat jet mill, and transport post-processing drying material (the post-processing drying material is the product of the same batch as that of Example 1) in the pulverizing chamber of the jet mill, At the same time, open the feed pipe of the organic treatment agent, so that the above-mentioned oil-water dispersion system enters the pulverization chamber for jet pulverization and organic coating. The interval time for completing contact is 1min56s. Control gas powder feed pressure 1.5MPa, gas powder crushing pressure 1.2MPa, gas-solid rati...

Embodiment 3

[0054] Produce titanium dioxide product C for plastics according to the following method:

[0055] (1) Inject siloxane and desalted water into the vacuum mixer at a mass ratio of 1:10, and raise the temperature of the system to 95°C by electric heating, control the stirring shear rate to 4000r / min, and stir for 5 minutes Stirring was stopped to obtain an oil-water dispersion system.

[0056] (2) Start the base material feeding equipment of the flat jet mill, and transport post-processing drying material (the post-processing drying material is the product of the same batch as that of Example 1) in the pulverizing chamber of the jet mill, At the same time, open the feed pipe of the organic treatment agent, so that the above-mentioned oil-water dispersion system enters the pulverization chamber for jet pulverization and organic coating. The interval time for completing contact is 3min2s. Control gas powder feed pressure 1.5MPa, gas powder crushing pressure 1.2MPa, gas-solid rat...

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Abstract

The invention relates to a titanium dioxide production technique, and particularly discloses an organic surface processing method of titanium dioxide for plastics. The method includes steps of fillingraw material siloxane and desalted water in a mixer at a certain ratio; rising system temperature to 80 DEG C above; stirring the raw material for over 5 min under the condition that the stirring shearing rate is 3000r / min above, so as to acquire an oil water dispersing system; immediately filling the oil water dispersing system in an air flow smashing device within 5 minutes after stirring and applying to organic coating of the titanium dioxide for plastics. The preparation method has the advantages of 1), significantly reducing the COD value of condensed water discharged in the organic processing process of the titanium dioxide for plastics, and effectively solving pollution problem; 2), keeping simple scheme and facilitating the popularization and practice on the industry; 3), keepingfrom bad influence on the quality of the titanium dioxide product for plastics.

Description

technical field [0001] The invention relates to a production process of titanium dioxide, in particular to a post-treatment method of titanium dioxide. Background technique [0002] At present, the production of titanium dioxide is mainly divided into the chloride method and the sulfuric acid method. Taking the sulfuric acid method as an example, the production process can be summarized as follows: [0003] (1) Acidolysis: carry out acidolysis reaction with titanium concentrate or acid-soluble titanium slag and sulfuric acid to obtain titanyl sulfate solution; [0004] (2) hydrolyzing titanyl sulfate solution to obtain thick metatitanic acid slurry; [0005] (3) washing and salting the thick metatitanic acid slurry to obtain pretreated metatitanic acid; [0006] (4) Calcination: the pretreated metatitanic acid is sent to a rotary kiln for calcination to produce a crude product; [0007] (5) Post-processing: the crude product is post-processed to obtain a titanium dioxide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/36C09C3/12
Inventor 蔡平雄潘远凤
Owner QINZHOU UNIV
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