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    Home > Coatings News > Paints and Coatings Market > Common knowledge of coating: Discussion on the reasons for the desquamation of putty powder for internal and external walls

    Common knowledge of coating: Discussion on the reasons for the desquamation of putty powder for internal and external walls

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: it is a very serious problem that the putty rubber powder is desanded, which will cause the latex paint to fall off, as well as the bulge and crack of the putty layer, and then cause the latex paint surface to crack There are many reasons for the powder removal of putty rubber powder from internal and external walls, including raw materials, construction and unreasonable formula design According to our many years of research and production practice and long-term construction practice, make a detailed analysis, at the same time, combined with our actual discussion of solutions and preventive measures 1 The bonding strength of putty is not enough, resulting in powder removal, the manufacturer blindly reduces the cost, and the glue powder is sticky Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: putty powder is a very serious problem, it will cause latex paint to fall off, as well as the bulge of the putty layer, cracks, and then lead to cracks in the latex paint finish There are many reasons for the powder removal of putty rubber powder from internal and external walls, including raw materials, construction and unreasonable formula design According to our many years of research and production practice and long-term construction practice, make a detailed analysis, at the same time, combined with our actual discussion of solutions and preventive measures 1 Due to the insufficient bond strength of putty, the manufacturer reduces the cost blindly, the bond strength of rubber powder is poor, and the addition amount is small, especially for the inner wall putty, the bond strength, the non debonding of rubber powder and the quality and addition amount of rubber powder and glue have a great relationship 2 Unreasonable design formula, material selection and structure are very important in putty formula For example, hydroxypropylmethylcellulose (HPMC) is used as the putty for the interior wall that is not waterproof Although HPMC is very expensive, it does not work on the fillers such as Shuangfei powder, talcum powder, wollastonite powder, etc if only HPMC is used, it will cause powder removal, and CMC and CMS with low price will not be powder removal, but CMC and CMS can not be used as waterproof putty or external wall putty, because CMC and CMS encounter calcium ash powder and white cement In addition, polyacrylamide is added to lime and calcium powder and white cement as waterproof coating, and chemical reaction is also taken to cause de dusting 3 The uneven mixing is also the main reason for the putty powder removal from the internal and external walls Some manufacturers in China have simple and various putty powder removal equipment, which is not a special mixing equipment The uneven mixing causes the putty powder removal The patent product horizontal multi screw belt mixer of China building paint portal network solves this problem, and the price is not high 4 If the mixing mixer has no cleaning function and there are many residues, the CMC in the common putty will react with the lime and calcium powder in the waterproof putty, and the CMC, CMS in the interior wall putty and the white cement in the exterior wall putty will react with each other and cause the desmear The cleaning port is set for the special equipment of China building paint portal network, which can clean the residues in the machine, not only ensure the quality of putty, but also can use one machine for many purposes, and buy one equipment to produce many kinds of putty 5 The different quality of filler is also easy to cause powder removal A large number of fillers are used for putty on the inner and outer walls However, the content of CO2 and CO3 in the heavy calcium powder and talcum powder varies from place to place, and the different pH also causes the powder removal of putty For example, the same powder is used for the inner wall putty in Chongqing and Chengdu, but the talcum powder and the heavy calcium powder are different In Chongqing, the powder is not removed, in Chengdu, the powder is removed, and in the river In the South and the northeast, the powder is not removed, but in some areas 6 The weather is also one of the reasons why the putty on the inner and outer walls is desanded For example, the putty on the inner and outer walls is dry and well ventilated in some arid areas in the north, and the putty facing is fast and does not desmear, but not in the south Especially in some areas in the south, there is rainy weather, long-term humidity, poor film-forming ability of the putty, and desmear, so such areas are suitable for the waterproof with lime and calcium powder Putty 7 Lime calcium powder, white cement and other inorganic binders are impure, mixed with a large number of fly ash The so-called multifunctional lime calcium powder and multifunctional white cement on the market are impure Because these impure inorganic binders are widely used, the waterproof putty for the internal and external walls will definitely be less waterproof than the powder removal 8 In summer, the water retention of putty for exterior wall is not enough, especially in the high-temperature and ventilated places such as the high-rise doorway and window of the building If the initial setting time of lime calcium powder and cement is not enough, the water will be lost, and the putty will be removed seriously if it is not well maintained Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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