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Analysis on the application method of exterior wall architectural paint finish

Data： 2022-05-26 11:02

1 Introduction

The exterior wall architectural paint finish has the characteristics of low cost, convenient construction, improved work efficiency, rich colors and easy maintenance and update. It has been widely used in all kinds of buildings for many years, but the problems of uneven color, discoloration, chalking and peeling often occur, which seriously affect the appearance of buildings. Many people doubt, waver, or even oppose the use of architectural coatings as finishes. In fact, the above-mentioned quality problems are mainly caused by improper construction operations. In order to prevent the quality problems of the exterior wall architectural paint finish, the builder must do the following.

2. Reasonable use of architectural coatings and matters needing attention

2.1 Requirements for coating quality

Paint quality is the key to determining the quality of the finish. For example, due to the different shades of paint, the color after construction is uneven; another example is the unqualified water resistance of the paint, after a period of time and the erosion of rain, the paint peels and falls off. Therefore, it is necessary to carefully unpack and inspect before construction, and do not use substandard products, especially to prevent individual manufacturers from using fakes and shoddy products when there is a large demand for coatings. If there is a color difference after the incoming material, it should be arranged reasonably and mixed in advance before use.

2.2 The grass-roots age is short

The coating film of the emulsion type coating has certain air permeability and alkali resistance, and can be applied when the base layer is not dry, but the age of the concrete and mortar base layers should be more than 28 days and 7 days respectively, otherwise the base layer will be affected by the age of the base layer. Too short, high moisture content, high alkalinity, and poor bonding with the remaining material, causing peeling. The coating film of solvent-based coatings has poor air permeability and hydrophobicity. If it is applied on a wet base, it is easy to peel and fall off. Progress and shorten the grassroots age.

2.3 Requirements for finishes

The surface is uneven, with obvious stubble or the difference between the smooth surface and the pockmarked surface. After spraying and brushing the paint, the color will be different under the action of light and shadow, forming a "flowery face". Therefore, before the paint decoration, the surface has the phenomenon of looseness, sanding, and chalking. It should be cleaned with a wire brush in advance, and the honeycomb holes should be filled with cement latex putty. The surface of the mortar base is calendered with an iron trowel, and then the small hemp surface is brought out with a water brush.

2.4 Treatment of pollution

If there is oil stain, rust, mold release agent and other substances on the surface of the base layer, after spraying and brushing paint, it will cause color reversion and yellowing. Therefore, first of all, the floating sand and dirt on the surface of the base layer should be removed, and if there is oil, rust, and mold release agent, it should be cleaned with detergent. When adding additives such as coagulant and antifreeze to the base mortar, care must be taken to choose a variety with high solubility in water and less precipitated substances to prevent the coating film from peeling off or different colors due to too much precipitated alkali.

2.5 Requirements for low construction temperature

All kinds of coatings need to form a continuous film under certain temperature conditions. If the temperature is lower than the minimum temperature, the film will be cracked and powdered due to the poor film formation of the coating, which will affect its life. Therefore, it is necessary to strictly control the minimum construction temperature allowed by various coatings. Generally, solution-based coatings can be operated above 0 °C, but in hot days, the solvent volatilizes too quickly and is not suitable for construction. Construction, emulsion type coatings can be selected with different varieties, generally used between 8 ℃ and 15 ℃.

2.6 Consequences of using putty incorrectly

If the base layer has holes and uneven parts, it should be covered with suitable putty. When using solvent-based paint, the varnish of the paint can be added with talc or white powder to form a putty of appropriate consistency, and the varnish is used as the primer. When using emulsion-type coatings, putty with low strength and poor water resistance such as large white and cellulose should not be used, otherwise the coating will roll down together with the putty in large pieces. 107 glue, white latex cement or equivalent putty must be used.

2.7 Attention should be paid to adding water and color

The coating needs to have a suitable consistency during construction. Some constructors add water at will when the consistency is large without stirring evenly, which