METHOD FOR REUSING SEPARATION LIQUID OF COLLECTED PAINT

摘要

PURPOSE:To reutilize separation liquid obtained from paint diluting water as washing water without deteriorating the efficiency for concentrating the paint diluting water. CONSTITUTION:Paint diluting water 2 is obtained by collecting water paint in washing water 1 and collected. Paint diluting water 2 is separated into paint and water. Thereby paint is recovered and also separation liquid 3 is reused as washing water 1. In the system, acid value of washing water 1 prepared by reusing separation liquid 3 is regulated to <=10 and pH thereof is regulated to 7.0-9.0. It is prevented by controlling the quantity of a low molecular acid component in separation liquid through acid value and pH that viscosity of concentrated paint is abnormally increased in the case of filtering and concentrating paint diluting water 2 obtained by collecting paint in washing water 1.