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Nowadays, most of the exterior wall coating is decorated with exterior paint, and some walls appear such as peeling, foaming, bursting, changing color and so on, reducing the aesthetics of the exterior wall. The reason, in addition to the quality of the paint itself, is due in part to inadequate understanding of the primer or improper use.
Due to grass-roots powdering, putty powdering, adhesion between coatings is not
enough, the substrate closed badly caused by peeling, foaming, bursting and other problems
Learn about closed primers and choose a good primer to avoid these hidden dangers.
Washing alkali-resistant closed primer role
building exterior wall whether cement dust or insulation anti-cracking mortar substrate, which is mainly cement composition, and many cement alkali components are relatively high, if the primer painting is not in place, even the primer quality is not good, will cause serious alkali re-alkali phenomenon, alkali will quickly corrode the outer wall coating film, resulting in fading, differentiation and cracking and other quality problems.
the biggest characteristic of anti-alkali closed primer is that it has strong adhesion to concrete and can form a good closed interval with concrete, which is mainly used to make concrete substrate protection material. To prevent the infiltration of water, anti-alkali isolation, the base of the alkali can be effectively isolated, to prevent the oozing of alkali damage coating. The loose powdered substrate is reinforced and the substrate is reinforced.
Please
the importance of painting alkali-resistant closed primers
1, closed effect:
walls generally use cement, and cement will usually return alkali, will form a layer of alkali frost on the surface, appear in pieces of white or crystal or powder, etc. , resulting in a flower wall. The root cause of pan-alkali appears, most of them are primer quality but off or not using primer or putty wall alkaline too strong. Other yellowing or color changes that occur are also mostly related to this. Closed primers can act as a closure to alleviate this situation.
2, to ensure that the water absorption rate is consistent:
substrate moisture content is a problem that must be highly noted, in particular, pay attention to the same wall may be different materials, different water absorption rate of the substrate material, will lead to the final finish of the outer wall paint watermark or color difference, safe and reliable prevention method is to pre-coat the professional manufacturers produced anti-alkali closed primer, so that the base water absorption rate is uniform. In addition, the substrate water absorption rate is not consistent, will lead to inconsistent coating drying time, uneven absorption, but also lead to color difference.
3, wall firmness:
quality but off the putty layer time will soon be powdered, if there is no primer protection, the surface layer will also appear powdering or even fall off. The primer seals the base and makes the putty layer stronger, thus extending the life of the surface and improving the construction quality.
How to choose alkali-resistant closed primer
Primer has transparent primer, black primer, then, transparent primer and black primer how to choose, these two different colors of primers are what differences?
Transparent primer and black primer is mainly different from the wall, if the wall is large or non-grid, you should use transparent primer, big grid after the use of black paint trace line, and if the wall is divided into small grid should use black primer.
As a user to clearly understand that the comprehensive performance of transparent primer is better than colored primer, simple understanding, colored primer is on the basis of transparent primer added a variety of colors of color pulp, color paste itself only plays a role in changing the color, a certain amount of color paste into the primer, will reduce the performance of the product itself, therefore, in the project material selection, as far as possible, the construction unit to choose transparent closed primer.
Exterior wall closed primer construction guidance
1, before the construction of the exterior wall primer, the need for a certain degree of maintenance of the external wall, to make the wall as flat as possible, there are no too obvious pits and bulges, not to have cracks and other hard injuries, these whole almost after the start of work.
2, paint on the exterior wall primer, primer has a very important role, it has a strong bonding capacity, the alkaline closure of the wall, so that the exterior primer construction can be bonded very firmly;
3, after these finished paint brushing, but before this to check the primer there is no leakage, there is no contamination on it, after the completion of these to carry out the first paint construction, paint brushing should also be uniform, consistent direction.
closed primer is like the foundation of a house, playing a vital role in the exterior paint coating system, so in the selection and construction of materials, users should pay more attention.