The wrong use of polyurethane paint thinner is divided into the following two kinds. Today, industrial anticorrosive paint manufacturer will explain the wrong use of diluent.
1, the use of the wrong special diluent or inferior diluent: this brings a certain impact on the adhesion of the paint, causing the occurrence of foaming and falling film coating defects. In polyurethane paint after drying to remove the edge of the tape will appear when the film falls off, this is the film adhesion is not good.
(1) the cause of this reason may be that the surface of the film is contaminated by pollutants;
(2) the selection of anticorrosive matching is not reasonable, and the poor matching between primers and topcoat is easy to cause the poor adhesion of paint. (3) the use of diluent is unreasonable, not matched, the product quality is low, and the dosage is unreasonable.
(4) in the paint is not dry without adhesive tape.
(5) remove the tape edge paint dry for too long, will cause the adhesion is poor. This is the cause of the poor adhesion of polyurethane paint produced. On the other hand the foaming phenomenon is due to the agitation is not uniform and no static generated, causing blistering. During the construction will be in the film blowing stroke needs to solve sandpaper the bubble polished with a dry cloth, paint and fill the gap if the color must be re brush over the corresponding region. All preventive measures: before use must be in accordance with the construction process and product specification of main agent and curing agent are mixed, stir a few times to prepare in strict accordance with the requirements of construction, construction technology and technology manufacturers, manufacturers asked the relevant technical staff at any time, can not blindly change the proportion of curing agent.
2, the type of fault or the proportion of diluent disorders. If the excessive transpiration time diluent, dilution or lack of proper contact will spray the constraint of paint particles, and a polyurethane topcoat film and coating composition lack off. polyurethane paint as coating products commonly used in the anticorrosion construction of heavy industry. Make sure before the surface clean, smooth, dry, avoid the use of the process and environment of water, acid, alkali and other substances in contact after use and sealing treatment, to prevent moisture penetration. When was chosen as the finish, primer to avoid the use of shellac, do not spray construction in high temperature and high humidity low temperature and high humidity environment, so as to avoid the occurrence of white film ills.
Edited by Alisa Jia