The brush putty is a process that must be performed before the wall decoration of the wool peony wall to paint, wallpaper, etc., so the putty layer also directly affects the overall effect of the wall decoration, if the putty is improperly purchased or the construction has errors It will cause a series of problems such as falling off of the wall and kicking drums. How to buy putty? Putty layer construction which precautions? Following Xiaobian together to understand it.
First, the classification of putty
In the market, putty has "water-resistant (N-type)", "general (Y-type)" products, the most important difference between the two is the degree of solidity. In general, it is better to choose waterproof putty for decoration. This is because the water-resistant putty has a longer life. Good water resistance means long service life, poor water resistance means short service life. In general, after the water-resistant putty is normally put on the wall, its service life should be more than 15 years, and the general putty can only reach about 5 years when the outer layer is protected by latex paint.
Water-resistant products require the bond strength in the standard state to reach 0.50Mpa or more, while the general type is only 0.30Mpa or more. In addition, the water-resistant products require the product to remain in the water for 48 hours after being shaved and remain free of peeling, cracking, and druming. , And can reach more than 0.30Mpa bond strength, and general products will fall off after immersion, the strength is zero.
Second, the advantages and disadvantages of water-resistant putty
1, feel good
The surface of the water-resistant putty is smooth and delicate after construction, and the putty after the light-harvesting treatment gives the person a creamy feel. The decorative effect can be used as a decorative layer.
2, good durability (secondary decoration does not eradicate)
Due to poor water resistance, ordinary putties must be removed and cleaned together with the original paint afterwards. Not only does the increase in costs result in wastage of resources, renovation costs (material costs, labor costs), and the waste that has been eradicated is difficult to be recycled and used, causing environmental pollution. Water-repellent putty is once and for all. After two years or three or more times of decoration, it is no longer necessary to shovel a putty layer, and the surface layer can be polished and repaired locally to complete the next process. This saves time and effort, and protects the wall. body. Generally good water-resistant putty ensures the same life as the wall.
3, high adhesion
JG/T 298-2010 "Building putty for indoor use" standard has a clear specification for the strength of putty, ordinary putty standard state bond strength greater than 0.25MPa, there is no requirement for the strength after water immersion, and water resistant putty required standard state bonding The strength reaches 0.50 MPa and the bond strength after water immersion is greater than 0.30 MPa. It can be seen from the standard that the strength of the water-resistant putty is higher than that of the ordinary interior wall putty, and therefore the use of a water-resistant putty does not easily cause emptying and shedding.
4, save paint
The unique whiteness and denseness of the water-resistant putty make it possible to save 25 to 30% of the coating amount per unit area of ​​paint adhesion and hiding rate compared to using a common putty wall.
5, high cost performance
The unit price of water-resistant putty is 1-2 times that of normal, which is also a factor affecting the promotion of water-resistant putty, but the decorative effect after water-resistant putty is far beyond the reach of ordinary putty. Moreover, from the total amount of paint, the cost of putty during construction and the construction cost, the use of water-resistant putty is low in cost.
However, water-resistant putty also has some shortcomings and deficiencies.
1, construction and grinding more laborious.
Because the water-resistant putty is stronger, the product is more rubbery than the non-water-resistant putty when mixing and scraping. The strength of the water-resistant putty is also higher than that of the non-water-resistant putty, and it is also more laborious to polish.
2, the product is not dry before the wall is alkaline.
The water-resistant putty needs to use a series of complicated reactions of ash calcium (CaO, lime) to meet water and carbon dioxide to increase its own strength, which will produce a certain alkaline calcium hydroxide, and this alkalinity generally lasts. 5-7 days will disappear. If this alkalinity is not controlled properly, it will cause the builders to have a burning sensation, and it may also decompose the colorant of the topcoat latex paint, resulting in uneven color.
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