Putty powder is a kind of base material used for wall repair, which lays a good foundation for the next decoration (painting and wallpaper). In the construction, the problem of powder removal of putty rubber powder often occurs, which will cause the falling off of emulsion paint, the bulging and cracks of putty layer, and then cause the cracks of emulsion paint finish. The reasons are analyzed as follows:
① The adhesive strength of putty is not enough, resulting in powder removal. The manufacturer blindly reduces the cost. The adhesive strength of rubber powder is poor and the amount of addition is small. Especially for interior wall putty, the size of adhesive strength and whether the powder is removed or not is closely related to the quality and amount of rubber powder and glue.
② Unreasonable design formula, material selection and structure are very important in putty formula. For example, hydroxypropyl methylcellulose (HPMC) is used as waterproof putty for interior wall. Although HPMC is very expensive, it does not work on filling materials such as Shuangfei powder, talc powder and wollastonite powder. If only HPMC is used, it will cause de powder, while CMC and CMS with low price will not de powder. However, CMC and CMS cannot be used as waterproof putty or exterior wall putty, because CMC and CMS encounter lime calcium powder White cement reacts, which will lead to de powdering. There are also polyacrylamide added with lime calcium powder and white cement as waterproof coating, which will also react chemically to cause de powdering.
③ Uneven mixing is the main reason for the de dusting of putty on internal and external walls. Some manufacturers in China produce putty powder with simple and varied equipment. It is not * * mixing equipment. Uneven mixing causes the de dusting of putty.
④ The error of production process causes the putty to be de powdered. If the mixing mixer has no cleaning function and there are many residues, the CMC in the ordinary putty will react with the lime calcium powder in the waterproof putty, and the CMC and CMS in the interior wall putty will react with the white cement of the exterior wall putty to cause de powdering** Do not use a mixing machine to produce two kinds of putty powder.
⑤ The different quality of fillers can also easily lead to de dusting. Fillers are widely used for internal and external wall putty, but the different content of ca2co3 in heavy calcium powder and talc powder and different pH will also lead to de dusting of putty. For example, the same rubber powder is used for internal wall putty powder in Chongqing and Chengdu, but talc powder and heavy calcium powder are different. They are not de dusted in Chongqing, de dusted in Chengdu, and de dusted in Henan Northeast China does not de pulverize, but de pulverizes in some areas.
⑥ Weather is also one of the reasons for the de dusting of internal and external wall putty. For example, in some arid areas in the north, the climate is dry, the ventilation is good, and the putty finish forms a film quickly without de dusting, but not in the south. Especially in some areas in the South, there is plum rain weather, long-term humidity, and the putty has poor film-forming property, which will also de dusting, Therefore, such areas are suitable for waterproof putty with lime calcium powder.
⑦ Inorganic binders such as lime calcium powder and white cement are impure and mixed with a large amount of Shuangfei powder. The so-called multi-functional lime calcium powder and multi-functional white cement on the market are not pure. Because these impure inorganic binders are widely used, the waterproof putty on the inner and outer walls must be de powdered and less waterproof.
⑧ The water retention of exterior wall putty is not enough in summer, especially in ventilated places such as high-rise doors and windows of the building. If the initial setting time of lime calcium powder and cement is not enough, it will lose water, and it will be seriously de powdered if it is not well maintained.
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