Method for treating circulating water in paint booths

Details Method for treating circulating water in paint booths Method for treating circulating water in paint booths

C - Chemistry, Metallurgy

09

D

C09D 7/00 (2006.01) B05B 15/12 (2006.01) C02F 1/52 (2006.01) C02F 1/54 (2006.01) C02F 1/56 (2006.01) C02F 1/68 (2006.01)

Patent

CA 2379219

The invention relates to a method for the treatment of circulating water in paint booths, whereby the paint particles are dispersed by adding dispersants selected from the group consisting of: a) homopolymers and copolymers based on maleic acid, acrylic acid and/or methacrylic acid with a molar mass ranging between 2500 and 500 000; b) non-ionic surface active agents; c) anionic surface active agents, whereby no polyaspartic acid is additionally added to the circulating water in said case and d) inorganic or non-polymeric organic complexing agents and mixtures thereof, their total concentration ranging from 0.01 to 2.0 percent by weight in relation to the circulating water. According to said method for the treatment of circulating water in paint booths, the circulating water has a hardness of at least 2~ measured in accordance with the German water hardness system. By adding dispersants in a concentration ranging between 0.001 and 2.0 percent by weight in relation to the circulating water, the paint particles are dispersed in such a way that they have a mean particle size of less than 20 µm determinable by laser diffraction.

L'invention concerne un procédé de traitement de l'eau de circulation dans des cabines de mise en peinture, selon lequel les particules de peinture sont dipersées par addition de disperseurs, sélectionnés dans les groupes suivants ; a) homopolymères et copolymères à base d'acide maléique, d'acide acrylique et/ou d'acide méthacrylique avec des masses molaires comprises entre 2500 et 500 000 ; b) tensides non-ioniques ; c) tensides anioniques, dans ce cas l'eau de circulation n'est pas additionnée d'acide polyasparaginique ; d) agents complexants anorganiques ou organiques non-polymères, ainsi que les mélanges de ces composés, dont la concentration totale est comprise entre 0,01 et 2,0 % en poids par rapport à l'eau de circulation. Selon ce procédé, l'eau de circulation présente une dureté d'au moins 2· selon l'indice de dureté allemand, et les particules de peinture sont dispersées par addition de disperseurs dans une concentration comprise entre 0,01 et 2 % en poids par rapport à l'eau de circulation, de manière à présenter une taille particulaire moyenne inférieure à 20 µm, qui peut être déterminée par diffraction laser.

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