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Method of processing for wet coating grooved circulating water

A treatment method and technology for circulating water, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., which can solve the problems of increased load of treatment equipment and difficulty in wastewater treatment.

Inactive Publication Date: 2006-09-13
KURITA WATER INDUSTRIES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] (e) Due to high COD and high BOD, wastewater treatment becomes difficult and the load on the treatment device increases

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Hereinafter, examples and comparative examples will be given to describe the present invention more specifically. However, it is not limited to the following examples within the range not exceeding the gist of the present invention.

[0069] The colloidal solution of melamine · aldehyde acid and phenolic resin used in the following are prepared into solutions as follows.

[0070] Preparation of melamine·alcolloid solution:

[0071] It was obtained by adding 0.5 mol of methylolmelamine produced by reacting 1 mol of melamine and 2 mol of oxydonic acid to 100 ml of a 1.35% by weight aqueous hydrochloric acid solution, and standing for a while. (hereinafter referred to as "M / F")

[0072] Preparation of phenolic resin solution:

[0073] Take 10g of caustic soda and 150g of pure water in a beaker, heat it to 70°C, add 40g of phenolic resin under stirring condition, stir and dissolve it.

[0074] Novolak-type phenolic resin manufactured by Qunyei Chemical Co., Ltd.

[007...

Embodiment 1～10、 comparative example 1～5

[0083] The test was carried out with a circulating water volume of 100 L / min using a test device with a storage volume of 50 L. The spraying conditions of the paint were 20 minutes at a speed of 15 g / min. The melamine-aldehydic colloidal solution or inorganic compound, which is used as a drug, is continuously added to the test water tank in a prescribed amount, and then the phenolic resin is continuously added in a prescribed amount. It is then introduced into a pressurized flotation unit. In the embodiments of the present invention, in order to observe the floating performance, the floating amount (the ratio of the total amount of the coating sludge in the circulating water tank to the amount of the floating coating sludge) and the floating speed of the circulating water tank paint sludge were measured.

[0084] Table 1 shows the addition amount and test results of melamine·alkyd acid colloidal solution, inorganic compound and phenolic resin.

[0085] NO

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PUM

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Abstract

When melamine, aldehydic acid colloid solution, etc are added into the circulating water containing water paint and / or solvent type paint inside wet painting tank to make the paint become non sticky, the formed dirt slurry possesses poor floating property and forms deposit inside the container or the circulating water tank. The present invention provides a solution to the said problem. After melamine, aldehydic acid colloid solution, and aluminum compound or iron compound are added into the circulating water containing water paint and / or solvent type paint inside wet painting tank to make the paint become non sticky, phenolic resin is added subsequently for the paint inside circulating water to float for separation.

Description

technical field [0001] The present invention relates to a method for treating circulating water of a wet coating tank capable of effectively coagulating paint in circulating water of a wet coating tank containing water-based paint and / or solvent-based paint. Background technique [0002] In the coating process of the automobile industry, household appliances, metal product manufacturing, etc., various paints are sprayed. [0003] Coatings used in industry are roughly divided into solvent-based coatings and water-based coatings, and various coatings can be used alone or in combination. [0004] Among them, water-based coatings are roughly divided into three types: soluble water type, dispersion type and latex type, and all of them use water as a solvent (some solvents are also mixed), so they have the following advantages: non-flammable, safe and hygienic, non-toxic Pollution etc. caused by the solvent may occur. Therefore, in recent years, its application range has been co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 堀内正弘
Owner KURITA WATER INDUSTRIES LTD
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