Wet type coating room circulating water treatment agent

Wet type coating room circulating water treatment agent

  • CN 106,103,353 B
  • Filed: 03/17/2015
  • Issued: 05/19/2020
  • Est. Priority Date: 03/17/2014
  • Status: Active Grant
First Claim
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1. A method for treating circulating water in a wet coating chamber,it includes:

  • in any of a path for supplying wet coating chamber circulating water from a water tank to a coating chamber, a path for collecting uncoated paint by the wet coating chamber circulating water, and a path for returning the wet coating chamber circulating water to the water tank, a wet coating chamber circulating water treatment agent comprising an aqueous solution having a pH of 10 to 13 containing condensed tannin, alkali metal hydroxide, and alkali metal carbonate, an aqueous solution having a pH of 10 to 13 containing condensed tannin and alkali metal hydroxide, or an aqueous solution having a pH of 10 to 13 containing condensed tannin and alkali metal carbonate is added to the circulating water to precipitate a part of the condensed tannin and make the uncoated paint collected by the circulating water non-stick,and the condensed tannin has high solubility in water at a high pH and low solubility in water at a low pH,the concentration of the condensed tannin in the aqueous solution is 10 to 30 mass%.

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