Qianjing Senior Engineer for your analysis: hydroxypropyl methyl cellulose (HOMC) manufacturer analysis of the use of internal and external wall putty powder problems and Solutions
1. Large area cracks occurred after batch drying.
Solution: Increase the amount of polyvinyl alcohol powder in putty, the initial drying of putty film mainly depends on organic binder to provide crack resistance. In addition, the fineness of the filler can not be too high, high fineness of the filler not only needs more binder to bond, but also causes greater drying shrinkage.
2, after a batch of scraping for a period of time did not timely paint, putty film cracks.
Solution: Putty film drying, in which the cement can not be fully hydrated to enhance strength, volume shrinkage, base bond strength is low, can not overcome the volume shrinkage stress, should be in Putty batch scraping timely coating.
3, batch scraping the same wall, cracking in some places, and not cracking in some places.