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How do bubbles and hollowing in the putty layer cause?

2018-10-21 Hits:271

Q: how does the putty bubble and hollowing happen? How should we handle it?

Answer: Putty layer is empty and bubbly, the main reason is that there is gas between the base layer and the putty layer, and why the air does not diffuse to the surface layer and to the base layer according to the normal internal diffusion, and appear in the middle, the main reasons are as follows: improper treatment of the base layer, so that the putty layer and the base layer contact is not close enough to form a clip. There is a dense layer between the base layer and putty layer, such as adhesive, occupied wood treasure or wall gongs without water for interface treatment, so that air can not normally diffuse to the base layer.

Solution: If the air bubble or hollow drum on the wall is small, it can be treated by polishing and then scraped with the wall gongs. If the hollow wall is large, it has caused a large area of shedding, then it is recommended to use the wall gongs after all removal, and then scraped in batches.

Q: how is the putty layer powdered seriously caused by it? How should we deal with it?

Answer: Putty dried powder, the root, can ultimately be attributed to the bonding system did not play its role, and why the bonding system, whether inorganic or organic binder lost its role, can be considered from the following aspects: 1 Putty itself binder quality problems; 2 binder does not play a role, glue The adhesive mechanism of the adhesive is the wet mortar containing adhesive powder. With the decrease of water absorption at the base layer, reaction consumption of hydraulic materials and surface volatilization to the air, the resin particles gradually approach, the interface gradually blurred, the resin gradually fuses with each other, and finally becomes a continuous polymer connector. This process mainly occurs in sand. The pores and solid surfaces of the slurry form adhesive action. If we scrape putty layer too thin or forced ventilation after scraping or heating drying, will cause excessive loss of moisture, binder resin particles can not form a good connector, thus losing the bonding effect.

Solution: mild powder can be used to remove the floating ash with wet towels, and then use the wall gongs for interface treatment, and then batch scraping can pay attention to the thickness of batch scraping;

If the putty layer is seriously powdered, it is recommended to remove it and then use the wall to make interface treatment and then batch scraping.

Q: how does the putty crack cause and how to deal with it?

Answer: there are many reasons for putty cracking, including external and internal reasons. Externally, dry and wet changes form dry shrinkage cracks; temperature changes and thermal expansion and cold shrinkage cause temperature cracks; wall structure deformation static and dynamic load cause structural cracks. Internally, many factors, such as product quality, construction technology (scraping thickness, interface treatment), maintenance methods and so on, may cause putty cracking.

Terms of settlement:

A. Dry and wet, temperature changes or batch scraping caused by micro-cracks: can be polished, scraped after the wall, pay attention to control the thickness;

B, large cracks caused by batch scraping and so on. After removal, the walls will be painted and putty.

C. Large cracks caused by wall cracking, after the removal of the wall coated with gongs, paste mesh cloth, and then carry out putty scraping, if the wall cracks larger, it is necessary to deal with the wall;

Q: dry powder putty consumption, how to calculate the amount of decoration.

Answer: theoretical consumption: 1 kg / m2 (batch thickness 0.5mm to 1mm, two times)

Consumption of dry putty = theoretical consumption * area of batching putty

Batching putty area = building area * (3.5 ~ 4)

Q: why does the construction temperature exceed 5 C when the putty is blown?

Answer: The dissolution of organic additives in putty needs to be at a certain temperature, the construction environment temperature is low, the dissolution rate of putty additives is very slow, additives can not be fully dissolved, will affect the construction performance and late film quality, resulting in waste of additives.

Q: why should the putty scraper thickness be controlled between 0.5mm and 1mm?

Answer: The one-off scraping thickness of putty is proportional to the curing shrinkage strength, and the increase of shrinkage strength is proportional to the cracking tendency of putty. The thickness of the putty increases, the strength of curing shrinkage increases, and the trend of cracking increases. Therefore, the thickness of batch scraping less than 1 mm can effectively reduce the curing shrinkage strength and avoid putty cracking; however, if the thickness of batch scraping is too thin, it will cause putty layer to lose water too quickly and lead to powder, so the thickness of batch scraping should be greater than 0.5 mm.

Q: why should the wall be cleaned without putty?

Answer: batch scraping putty is actually the bonding process between putty and wall. The adhesive is firm and firm, and the putty will not crack during curing. If there is floating ash or loose wall, putty layer can not bond firmly with the wall, solid, in the putty solidification process or in the four seasons of temperature and humidity changes in the environment, putty carries out unlimited repeated shrinkage and expansion, displacement, sliding, resulting in putty cracking

Q: why should putty be stirred for a few minutes before stirring?

Answer: It takes a certain time to dissolve all kinds of organic additives in putty in water. If not fully dissolved, it will affect the construction performance and the quality of film formation in the later period, resulting in waste of additives.

Q: what is putty?

Answer: putty is flat material on the wall, mainly refers to the wall surface layer of leveling material. According to the usage environment, the inner wall putty and the outer wall putty are classified as powder and paste according to their physical characteristics, non-water-resistant putty, water-resistant putty, flexible putty and elastic putty according to their functions.