Construction essentials of the hottest interior wa

2022-09-22
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Essentials of interior wall coating construction

the most basic requirements for the coating surface of architectural coating - dry, firm and clean

1. Drying: the cement wall shall be maintained for at least 1 month (7 weeks in winter), the humidity shall be less than 6%, and the humidity on the wood surface shall be less than 10%; The wall surface is free of water seepage, cracks and other structural problems

2. Firm: there is no powdered loose matter, and there is no loose paint on the old wall

3. Cleanliness: there is no oil, grease, mold, algae and other adhesion. Friction and wear testing machines of Jinan experimental machine factory have been widely adopted in developed countries

if the substrate does not meet the requirements, it will seriously affect the performance of the paint film. High wall humidity may cause blistering, peeling and peeling of the paint film, as well as alkali seepage on the wall, gloss loss of the paint film and even mildew; When the substrate is loose and there is dirt adhesion, it will affect the adhesion of the paint film, resulting in peeling and other phenomena. If there is mold breeding, there will be an alarm and a device to forcibly stop burning in the rain, resulting in mold growth of the paint film

II. Substrate treatment

1. New wall surface. After maintenance for more than 1 month, the humidity is less than 6% (can be tested with a hygrometer), and the floating ash stain and alkali exudation are removed

2. Old wall surface. Wash with high-pressure water or mechanically polish to remove ash and possible bacteria and algae, wash and dry. If necessary, brush with anti mildew solution (10% solution can be prepared with bleaching powder), and then wash with water

the old coating is intact and can be recoated directly after cleaning the surface; The old coating has chalking, blistering, cracking and peeling, so the old coating needs to be removed and the primer and finish paint should be applied again

3. Walls with wallpaper. The wallpaper can be torn off, the glue washed off, and the paint can be applied after proper treatment according to the wall condition after drying

4. Glass fiber surface. The finish paint can be applied directly

5. Wood. The worn and rotten parts of the surface shall be removed or replaced, the surface shall be cleaned and repaired, and the joint of doors and windows and walls shall be filled with elastic fillers

6. Metal surface. Iron: remove the rust spots on the surface first, and brush the corresponding anti rust primer immediately after cleaning; Non ferrous: remove the oil stain and oxide layer on the surface, and brush the primer with increased adhesion

III. wall treatment

1. If the wall is flat, it is recommended not to use putty

2. If putty is used, it is easy to apply it thinly rather than apply it thickly

3. In addition to being easy to approve and polish, putty should also have good strength and durability. For exterior walls, kitchens and toilets, the requirements for putty should have better adhesion, adhesion durability and water resistance

4. Treatment methods for possible problems on the wall: dust and powder - wash with high-pressure water outdoors and wipe with wet cloth indoors; Grease - clean with neutral detergent; Mortar - remove it with shovel, scraper, etc; Mold - wash with high-pressure water outdoors, scrub with bleach indoors for a few minutes, rinse with water and dry; Old paint film - wash with high-pressure water, or scrape with a scraper and mechanically polish; Damp - strengthen ventilation and extend drying time; Cracks and joints - scrape off the loose old paint film or plaster, and repair it with filler insoluble in water. Larger and deeper holes can be embedded in batches; Nail rust - brush away the rust, polish the nail head, and knock the nail 3 or 4mm away from the paint surface, apply antirust primer, flatten and polish

IV. construction conditions

latex paint has high requirements for construction and maintenance conditions because it is a water-based paint. The construction and maintenance temperature is higher than 5 ℃, and the environmental humidity is lower than 85%, so as to ensure good film formation. Generally speaking, the maintenance time of emulsion paint is 7 days (25 ℃), and the low temperature should be extended appropriately. Low temperature will cause problems such as pulverization and cracking of latex paint film, and environmental humidity will make the paint film dry for a long time, which will eventually lead to poor film formation. Weather factors must be taken into account in the construction of external walls. It cannot rain for 12 hours before painting emulsion paint. And the humidity of paint construction and maintenance should not be too low, especially for two-component reactive coatings, low temperature (<5 ℃) the film-forming process will become very slow. Therefore, it is necessary to ensure that the substrate is dry. After painting, it cannot rain for 24 hours to avoid the paint film being washed away by rain.

v. the coating system

can meet the standard and get normal production. The coating system of general interior wall architectural coatings is divided into two layers: primer and finish.

1. Primer. Primer has the alkaline function of closing the wall, improving the adhesion of finish and enhancing the fullness of the appearance of paint film Functions of. Surface coating performance and surface effect are greatly affected. If the primer is not used, the adhesion of the paint film will be weakened, and the alkaline wall surface will have a greater impact on the performance of the paint, especially the bottom surface of white cement putty, which may cause the problems of paint film chalking, yellowing, alkali seepage, etc., damage the performance of the finish paint, and affect the service life of the paint film. It is recommended to use ha jd1 or wd1 super alkali resistant sealing primer for the construction of interior wall emulsion paint

2. Finish paint. Topcoat is the last coating in the system, which has decorative function and resists environmental infringement. Considering the different requirements of users, ha can recommend different interior wall paints to you

VI. coating process

to achieve good coating effect, skilled operation level is required, but the construction of emulsion paint is not very difficult

first of all, the substrate should be clean, dry and firm. Operate according to the instructions. The coating conditions are suitable, and the dilution ratio is accurate. Excessive dilution will make the coating not cover the bottom, powdered, glossy coating will lose light, and the color is different. If the painting skills are not skilled enough, matte paint can be selected, so that the wall defects are not easy to be exposed. During the construction of glossy emulsion paint, such as AHA three plus one and beautiful J50 products, the bottom surface should be flat as much as possible, and the wall surface needs more putty. Feel that the wall surface has no sense of height by hand, otherwise the light is easy to show the defects; Secondly, good construction tools are also necessary. The surface effect of the paint film sprayed on the vehicle VOC is the best, but it may cause environmental pollution; Generally, roller coating is relatively simple and feasible, so it is most used. Short hair roller is a better choice. Although the amount of paint is small, it is not easy to blister, and the obtained paint film is relatively flat. The common painting sequence for interior wall painting is from the top to the bottom. In practice, it starts from the ceiling, then the walls, doors and windows, and finally the skirting boards, window rafters, etc

before using the paint, fully mix and stir it according to the instructions on the barrel. If you use paint of the same color and different batches and paint it on the same plane, it is recommended to mix them in a larger container before using it, so as to ensure the overall uniformity. This is like knitting a sweater. If there is not enough wool, it is difficult to buy wool without chromatic aberration. Paint sometimes has a small amount of color difference between batches

-- brushing: remove the fallen bristles before using the brush. Comb it thoroughly with your fingers to ensure that it has been completely removed. Wet the paint brush with a liquid with the same properties as the paint you use. If you want water-based paint, wet the brush with water, and soak the brush in solvent before using oil-based paint. When taking paint, immerse the brush in half of the paint, which is very important to prevent paint backflow. The paint deposited on the back of the brush is difficult to remove and harden the bristles. After reclaiming, tap the brush on the edge of the bucket a few times to avoid excessive reclaiming, but don't scrape hard. When painting a large area with a paint brush, you can first paint stripes as wide as a brush vertically, then paint them evenly in the horizontal direction until they are covered, and finally wipe them gently in the vertical direction. If the brush and roller are used at the same time, draw the frame of the part to be painted first, which is called "cut in", in order to draw a plane suitable for roller painting on the wall with a paint strip about 3cm wide. The specific operations are as follows: use the narrow end of the paint brush to draw a frame on the wall, do not use too much force, and the scope of one-time sketch should not be too large. Then use the roller to paint, and recoat with the roller strip before the end, so as to avoid the "frame" effect caused by the rapid drying of the paint at the line

-- roller coating: wet it with water (brush water-based paint) or solvent (brush oil-based paint) before use. If you want to brush the ceiling, you can first connect the wooden rod or aluminum rod on the roller handle, which will be more handy. Pour the paint from the paint bucket into the reclaiming tray. Don't fill it too full at one time. Gently immerse the drum in the paint, and roll it back and forth evenly to make all parts of the bristles full. When painting, the roller is painted into a "zigzag" shape on the wall, and the first painting should be from bottom to top. Each time you use it, you can brush about half a square meter. When the paint on the drum is about to be brushed, brush back to the place just brushed, so as to evenly spread the paint. During the midway break, the drum stained with paint cannot be exposed to the air for a long time. It must be wrapped in plastic bags or soaked in water or solvent according to the nature of the paint

VII. Post coating treatment

after the construction, the tools need to be cleaned immediately, otherwise the tools will be damaged after the paint dries; The remaining paint shall be kept clean and sealed

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