Causes and prevention methods of paint stripping of latex paint on interior and exterior walls
1. The insufficient bonding strength of latex paint causes powder removal. The manufacturer blindly reduces the cost of raw materials, resulting in poor bonding strength of latex paint and a small amount of addition. Especially for interior wall putty, the bonding strength is poor.
2. The design formula is unreasonable. Problems with material selection and structure are very important in the putty formula. For example, hydroxypropyl methylcellulose (HPMC) is used as a non-waterproof putty for interior walls. Although HPMC is very expensive, it does not work on fillers such as sulfate powder, talc powder, wollastonite powder, etc. If only HPMC is used, it will cause delamination. However, CMC and CMS cannot be used as waterproof putty or exterior wall putty because CMC and CMS react with gray calcium powder and white cement, which will cause depowering. Powder and polyacrylamide are also added to gray calcium powder and white cement as waterproof coating, which will also cause chemical reactions to cause powder removal.
3. Uneven mixing is also the main reason for the peeling of interior and exterior wall putty. Some manufacturers across the country produce latex paint with simple and varied equipment. They are not special mixing equipment. Uneven mixing can cause latex paint to peel off.
4. Errors in the production process cause latex paint to peel off. If the mixer does not have a cleaning function and there is a lot of residue, the CMC in ordinary putty will react with the gray calcium powder in waterproof putty. CMC and CMS in interior wall putty will It react with the white cement of the exterior wall putty and cause powder removal. The special equipment is equipped with a cleaning port, which can clean the residue in the machine. This not only ensures the quality of the putty but also allows one machine to be used for multiple purposes. You can buy one piece of equipment to produce a variety of putties.
