Gypsum putty, also known as wall scraping putty, is a powdery material with construction gypsum powder and talcum powder as the main raw materials and a small amount of gypsum modifier. When using, add water and stir evenly, and use a scraper to flatten the wall. It is an ideal substrate for spraying and pasting wallpaper. If you choose gypsum powder with high fineness or add inorganic pigments, it can be directly used as interior decoration finish.
As we all know, the surface decoration of concrete walls and roofs needs to go through processes such as surface plastering, degreasing, chiseling, plastering leveling mortar, and then putting putty, which is time-consuming and labor-intensive, and the ground has a lot of ash content, and it is difficult to guarantee that no damage will occur. Hollowing, cracking phenomenon. Gypsum putty makes full use of the characteristics of fast setting, high bonding strength, white and delicate construction gypsum. It is made by adding various admixtures to improve the performance of gypsum, and it is a thin-layer plastering material in a broad sense. The comprehensive strength of this kind of gypsum putty is greater than 4.0MPa, the flexural strength is greater than 2.0MPa, the bonding strength is greater than 0.3MPa, and the softening coefficient is between 0.3-0.4, so this hardened slurry will not collapse after absorbing water. However, the hardening paste of traditional talcum powder and calcium carbonate powder putty depends entirely on the drying strength. When immersed in water, it immediately collapses.
In recent years, products such as waterproof putty and paste putty have appeared on the market, and the price per ton is more than 1,000 yuan, which discourages some civilian residential consumers. Therefore, gypsum putty in the true sense is an indispensable material for civil and public buildings at this stage. The traditional gypsum putty is mostly mixed with talcum powder, calcium carbonate powder, sodium alginate or cellulose ether, and white latex into a thick paste at the construction site. This method of leveling the wall cannot guarantee the quality. Peeling, peeling, dusting, etc. are inevitable, let alone wallpaper.