Views: 6 Author: Site Editor Publish Time: 22-06-2021 Origin: Site
1. Putty powder powder
Phenomenon: after the construction is completed and dry, there is a phenomenon of powder dropping by hand touch.
Causes:
(1) the inner wall putty powder polishing time is not good, the surface has been dry and then polishing will be depowdered;
(2) the outer wall putty powder, the coating is relatively thin when facing, in the summer high temperature, the moisture volatilizes quickly, the surface layer does not have enough moisture to solidify, so it is easy to powder.
(3) the product exceeds the shelf life, and the bond strength decreases greatly.
(4) improper storage of products, moisture absorption after the bonding force decreased significantly.
(5) the base water absorption rate is high, leading to the putty drying speed is fast, there is no enough water to solidify.
Solution:
(1) When polishing the putty surface layer of the inner wall, it is necessary to master the appropriate polishing time. The best time for polishing is to polish the putty surface immediately after the watermark disappears.Practice has proved that 1~2m2 of the face should be pressed or polished.
(2) After the surface of the external wall putty is dry, it should be properly polished and adequately maintained by dashing. The general maintenance is divided into two or more times. If necessary, please add water with transparent sealing primer (1:5) as the second dashing liquid, and the effect will be better.
(3) The product must be used within the shelf life. If it exceeds the shelf life, it must be tested and scraped. After passing the inspection, the construction can be carried out again.
(4) the product must pay attention to waterproof treatment, should be in a cool and dry place, and ensure that the package is intact.
(5) in summer or high temperature and strong wind climate conditions, it is best to wet the wall with water before applying the putty, and the wall surface can be applied after there is no clear water.
2. Blistering putty
Phenoms: bubbles are produced in the process of construction and after a period of time, the putty surface bubbles.
Causes:
(1) The base is too rough and the oscillation speed is too fast;
(2) a construction putty layer is too thick, greater than 2.0mm;
(3) The moisture content of the base is too high, and the density is too large or too small.Because of the rich void and the high moisture content of the putty, it is impermeable, and the air is closed in the void cavity, which is not easy to eliminate.
(4) After construction for a period of time, burst bubbles appear on the surface, mainly caused by uneven mixing. The slurry contains powdery particles that are too late to be dissolved. After construction, a lot of water is absorbed and burst is formed by swelling.
Solution:
(1) there is a large area of foaming putty surface, use the shovel knife to directly crush the bubble mouth, and then scrape the foaming surface layer with the appropriate putty.
(2) Putty is generally stirred evenly, standing for about 10 minutes, and then stirred again with an electric mixer on the wall.
(3) If there is bubbling phenomenon in the second or last surface layer in construction, the squeezer should be used to break the bubble before the watermark is eliminated to ensure that there are no bubbles on the putty surface.
(4) especially rough wall, general base material as far as possible to choose coarse putty.
(5) When the wall is too dry or the wind is strong and the light is strong, wet the wall with water as far as possible first, and then scrape the putty layer when there is no clear water on the wall.
3. Putty falls off
Phenomenon: refers to the bond strength between the putty and the base is poor, and falls off directly from the base.
Causes:
(1) the old wall is very smooth (such as tempered putty, polyurethane and other oil paint), putty powder and its surface adhesion fastness is poor.
(2) the new wall is moulded with a smooth surface and contains a large amount of release agent (waste oil or silicone).
(3) for wood substrate, metal substrate and other non-mortar substrate (such as plywood, plywood, particleboard, solid wood, etc.) on the direct application of scraping putty, due to the surface expansion and contraction ratio is different, and this kind of product water absorption rate is strong, the rigid inner wall putty can not be deformed, generally in 3 months will cause falling off.
(4) when the putty exceeds the shelf life, the bond strength decreases.
Solution:
(1) remove the exfoliation layer and deal with it according to the following situation;
(2) polish the old wall, increase the surface roughness, and then use the interface agent (10% environmental protection glue or interface agent treatment);
(3) remove the mold release agent or other oil components on the surface with oil cleaning agent, and then apply scraping putty.
(4) the use of two components or special plate putty for construction.
(5) marble, Mosaic, tile and other exterior wall surface, please choose exterior wall renovation putty as the base.
(6) Use in the putty shelf life.
4. Putty powder turns yellow
Phenomenon: refers to the putty construction after completion, shortly that part or all appear yellow
Causes:
Mainly occurs in the old indoor wall, old wall putty uses a lot of PVA glue, glue aging decomposition, produce unsaturated acid, unsaturated acid and calcium ions in the putty reaction, generate the corresponding yellow calcium salt.
Solution:
(1) roll coated with environmental glue for two times, dry thoroughly, and then apply the putty to the inner wall;
(2) with closed primer rolling coating two, thoroughly dry, and then batch scraping putty.
(3) all use paste putty construction, or with plate putty construction.
5. Delamination of putty
Phenomen: putty between two layers or putty and base peel each other
Causes:
(1) the base contains a large number of release agents (such as waste oil, wax emulsion);
(2) the base is seriously pulverized and the water absorption is too large.
(3) the bottom putty powder is serious, the bottom putty is too hard, drying too fast will also cause falling off.
(4) the construction interval between the two layers of putty is too long, generally more than 15 days, and the decorative layer will sometimes cause delamination.
(5) After construction or during construction, the putty layer is infiltrated by rainwater or other permeable water, resulting in the loss of effective components of putty, and will fall off.
(6) the two layers of putty is unreasonable.
Treatment method:
(1) to remove the exfoliation layer, re-select the special putty batch swing;
(2) the construction surface of serious powder, it is best to use 10% sealing primer diluent for sealing, to be dry, and then carry out the corresponding putty layer or other construction
(3) putty, especially putty for inner wall, shorten the interval of two putty construction as far as possible;
(4) pay attention to the protection of the construction process, in the putty construction process or within 8 hours after the construction, putty had better not be soaked by water;
6. Cracking putty
Phenomenon: putty construction after a period of time, the surface cracking.
Causes:
(1) the construction of the base is not completely dry, and the construction requires that the moisture content of the base is less than or equal to 10%.
(2) the bottom putty is not dry, it is over the surface, the surface is dry first, and the inner layer is still in the drying process, resulting in different degree of dry shrinkage between layers, easy to crack.
(3) when the base is processed, the seam patching and patching material is not completely dry, and the inner wall putty with strong hardness is scraped above, which is easy to cause cracking;
(4) the construction is too thick, the internal drying is slower, the surface drying speed is faster, and it is also easy to cause cracking.
Solution:
(1) The putty that has been cracked needs to be eradicated. If the crack is not too big, the flexible putty can also be used for the first construction, and then the construction is carried out in accordance with the standard construction method.
(2) each construction should not be too thick, two construction time interval must be greater than 4 hours, before the putty is completely dry, after the road scraping.
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