Common knowledge of coating: Problems and solutions of putty

Core tips: [information] What is putty Answer: putty is the flat material on the wall, which mainly refers to the flat material on the surface of the wall According to the use environment, there are: interior wall putty and exterior wall putty; according to the physical characteristics, there are powder and paste; according to the function, there are non water resistant putty, water resistant putty, flexible putty and elastic putty Q: how is the foaming and hollowing of putty layer caused and how to deal with it? Answer: the main reason for the hollowing and blistering of putty layer is that there is gas between the base layer and putty layer, and why the air does not diffuse to the surface layer and to the inside of the base layer according to the normal way, but appears in the middle, mainly due to the Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Paint Home News: [news] Q: what is putty A: putty is the flat material on the wall, mainly refers to the flat material on the wall surface According to the use environment, there are: interior wall putty and exterior wall putty; according to the physical characteristics, there are powder and paste; according to the function, there are non water resistant putty, water resistant putty, flexible putty and elastic putty Q: how is the foaming and hollowing of putty layer caused and how to deal with it? Answer: the main reason for the hollowing and blistering of putty layer is that there is gas between the base layer and putty layer, and why the air does not spread to the surface layer and to the inside of the base layer according to the normal way, but in the middle, the main reasons are as follows: improper treatment of the base layer makes the putty layer and the base layer not close enough to form a interlayer; there is a dense layer between the base layer and putty layer, such as The interface treatment shall be carried out with glue, zhanmubao or wall Gu without water, so that the air can not normally diffuse to the base Solution: if the wall bubbles or hollows are small, they can be polished and then treated with wall Gu for interface treatment, and then scraped in batches; if the wall hollows are large, which has caused a large area of falling off, it is recommended to remove them all and then use wall Gu for treatment, and then scraped in batches Q: how is the serious pulverization of putty layer caused and how to deal with it? Answer: when putty dries, the powder will be removed The root of this problem can be attributed to the fact that the bonding system does not play its role, and why the bonding system, whether inorganic or organic, has lost its role, can be considered from the following aspects: 1 The quality of the putty's own binder is in question; 2 The binder does not play its role, and the bonding mechanism of the adhesive is the wet mortar containing the glue powder With the decrease of water absorption in the base layer, reaction consumption of hydraulic materials and volatilization of the surface layer to the air, the resin particles gradually approach, the interface gradually blurs, the resin gradually merges with each other, and finally becomes a continuous polymer connector This process mainly occurs on the pores and solid surface of mortar, so the bonding effect is formed However, if the putty layer is too thin or forced ventilation or heating and drying after scraping, the water will be lost too fast, and the resin particles of the binder can not form a good connector, thus losing the bonding effect Solution: the floating ash can be removed with wet towel when the powder is slightly removed, and then the interface treatment can be carried out with wall Gu, and the thickness of the coating can be noticed after the batch scraping; if the putty layer is seriously powdered, it is recommended to use wall Gu for the interface treatment and then the batch scraping Q: how is the cracking of putty layer caused and how should it be handled? Answer: there are many reasons for putty cracking, including external and internal reasons From the outside, the dry shrinkage cracks are caused by the change of dry and wet, the temperature cracks are caused by the change of temperature and the expansion and contraction of heat, and the structural cracks are caused by the static and dynamic load of the wall structure deformation From the internal point of view, many factors such as product quality, construction technology (batch thickness, interface treatment), maintenance mode and so on may cause putty cracking Solution: A small cracks caused by dry and wet, temperature change or excessive thickness of batch scraping: it can be polished, scraped after painting wall Gu, pay attention to control the thickness; B large cracks caused by excessive thickness of batch scraping, brush wall Gu after eradicating, and then apply putty; c For the large cracks caused by wall cracks, brush the wall after removal, paste the gridding cloth, and then apply putty If the wall cracks are large, handle the wall; Q: how to calculate the consumption of dry powder putty: theoretical consumption: 1kg / square meter (0.5mm-1mm, twice) The amount of dry powder putty = theoretical consumption × area of putty application = building area of living room × (3.5-4): why is the construction temperature above 5 ℃ when putty application? Answer: the dissolution of organic additives in putty needs to be at a certain temperature The construction environment temperature is low, the dissolution speed of putty additives is very slow, and the additives cannot be fully dissolved, which will affect the construction performance and the film-forming quality in the later stage, resulting in the waste of additives Q: why should the thickness of putty be controlled between 0.5mm and 1mm? A: the thickness of putty once applied is directly proportional to the curing dry shrinkage strength, and the increase of dry shrinkage strength is directly proportional to the cracking trend of putty With the increase of putty thickness, the curing shrinkage strength and cracking tendency increase Therefore, if the thickness of the batch is less than 1mm, the curing shrinkage strength can be effectively reduced and the putty cracking can be avoided; however, if the thickness of the batch is too thin, the water loss of the putty layer will be too fast, resulting in pulverization, so the thickness of the batch is greater than 0.5mm Q: why should the wall be cleaned before puttying? A: puttying is actually the bonding process between the putty and the wall The adhesive is firm and firm, and the putty will not crack during curing If there is floating ash or loose wall surface, the putty layer cannot be firmly and firmly bonded with the wall surface In the process of putty solidification or under the environment of temperature and humidity changes in four seasons, the putty shrinks and expands infinitely and repeatedly, causing displacement and sliding, leading to putty cracking Why should the putty be mixed and put for several minutes before mixing Answer: it takes a certain time for all kinds of organic additives in putty to dissolve in water If not fully dissolved, it will affect the construction performance and film-forming quality in the later stage, resulting in waste of additives 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,