I Lacquer technological process
1. Base surface treatment
2. Batch scraping and leveling putty
3. Roll coating alkali resistance Primer Or sealing primer (black bottom or same color bottom)
4. Gutter joint division treatment
5. Spray super weather resistant stone like paint
6. Spray dust cover Topcoat (water-based or oil-based)
2、 Construction Guide
Processing of forward step base surface
Since the condition of the foundation surface is directly related to the construction quality of Jianrong stone like paint, the foundation surface must be carefully checked and accepted before decoration.
The specific requirements are as follows:
1) The newly built walls need to be fully cured and dried; For the old wall that has been damped and peeled off, it needs to be bottomed again
A series of spraying construction can only be carried out after the layer is shaken.
2) The base surface shall be flat and clean without oil stain, floating ash or other pollutants.
3) To the old wall Or the original old coating on other base surfaces shall be tested to confirm its adhesion; If the adhesion is poor, it must be completely eradicated.
Base acceptance criteria:
1. Surface flatness: it is generally required that the dislocation is less than 3mm. If it exceeds this range, it needs to be polished to make it flat.
2. There shall be no delamination, hollowing, cracks on the surface layer, wind cracks no more than 0.2mm, obvious sand holes and other defects.
3. The surface layer shall be plastered to a high level, that is, the perpendicularity of the production surface shall not be more than 3mm, the surface flatness shall be less than 2mm, the perpendicularity of the internal and external corners shall be less than 2mm, and the squareness shall be 2mm.
4. The surface must be flat, clean, uniform in color, free of cracks, obvious joints, dust, oil stains, exposed steel bars, iron wires, wood chips, red corners and gray lines, straight, clear and beautiful.
5. The corner protection shall comply with the construction specifications, and the width of the separation joint (strip) and the high level shall be uniform, flat and smooth, the edges and corners shall be neat, horizontal and vertical.
6. Alkalinity of base course: PH value of base course wall is lower than 10.
7. Water content of the base course: the water content of the base course is less than 8%, and the newly painted mortar surface course can only be constructed after about 3 weeks.
8. Surface dirt: surface dust, oil stain, etc. shall be removed with wire brush, synthetic detergent, etc., or polished with coarse abrasive cloth, and construction can be started after cleaning and polishing.
Step 2: Apply leveling putty and polish
(1) Putty shall be applied with trowel, scraper or steel trowel from top to bottom. Each layer of putty shall not be too thick, which is easy to crack, fall off and other defects. Generally, one layer of exterior wall putty is about 0.5~1.0mm.
(2) Putty is usually applied twice, and the interval between two putties cannot be too short. The second layer of putty must be applied after the first layer of putty is dry.
(3) When applying putty, do not apply it back and forth too much to avoid curling, falling off or extruding the glue in the putty, and sealing the surface is not easy to dry.
(4) When applying putty, pay attention to the technique, press the blade tightly with the forefinger, press the putty into the defect with force, fill and compact, collect and scrape the putty around, and minimize the traces of putty.
(5) After the putty is completely dry (usually 12 hours in sunny days), polish it with corresponding sandpaper and clean the dust.
Step 3 Construction of exterior wall primer: (exterior wall alkali resistant primer or sealing primer)
The painting of exterior wall primer is the third process in the coating structure. After painting, a film is formed on the putty layer. The particle size of the emulsion is very small, which can penetrate deeply into the coated base layer. It has the following functions:
The primer can quickly penetrate into the interior of the base material and putty layer to form a tight sealing isolation layer. The flexibility of the paint film is good, which can effectively prevent the external acid, alkali, water, oil and other substances from eroding the wall, achieve a better acid-base balance, effectively prevent the paint film from falling off, spreading alkali, and the paint film from blooming, and also prevent the mold growing in the base material or putty layer from seeping out to affect the decorative effect of the exterior wall. Improve the adhesion and high hiding power of the finish, and at the same time, color paste can be used for color mixing to save the exterior wall finish.
It is suitable for all kinds of outdoor substrates, such as cement, masonry, concrete and other new and old walls, especially for new walls and walls with heavy alkaline substrate.
|Construction ratio: see product specifications of each model for details
|Brush coating or roller coating: add water to dilute and mix evenly. Appropriate adjustment can be made depending on the difficulty of construction and the ambient temperature, and excessive dilution is not allowed.
|Ordinary spraying: add 5~10% water for dilution and stir evenly
|Airless spraying: it is not recommended to add water for dilution.
The mixed material should be put and cured for 10-15 minutes before mixing evenly for better construction effect.
|Theoretical painting area: 8-10 ㎡/kg/time
Construction method: brush coating, roller coating and spraying. When the construction thickness (wet film) is greater than 30 μ m, better results can be achieved.
Construction conditions: the ambient and wall temperature is above 50C, and the relative humidity is not higher than 85%. The moisture content of the wall is less than 10%, and the PH value is less than 10. The next process can be started only after the primer is completely dry.
Primer acceptance criteria:
Visual inspection of the surface: the surface is smooth, flat, even, clean, without sand holes, obvious brush marks, missing coating, etc., and the appearance of the large surface is good.
Step 4: trenching construction
1. Level the wall according to the design requirements, measure the size, snap the line with the ink cartridge, fix the position, and stick the masking paper for protection.
Step 5 Stone like paint construction:
Pour it out after opening the can and fully mix it evenly. It is recommended to directly construct without adding water. If more water is needed, it should not exceed 3%. The diluted stone like paint should not be poured back into the original package, and the products that have been opened should be used up as soon as possible. According to the requirements of spraying effect, choose the spray gun with appropriate caliber, * * * spray gun Ф 2~4mm, medium caliber spray gun Ф 4~6mm, large caliber spray gun Ф 6~8mm, and the nozzle is 40~50cm away from the wall. Generally, the pressure of air compressor is adjusted to about 4-7 kg f during spraying. For the process of spraying stone like paint for different shapes, the specifications and dimensions shall be designed according to the requirements, and then the required models shall be made with textured paper on the painted wall surface. After the stone like paint is sprayed, the textured paper can be torn off before the stone like paint has dried. When spraying large areas, the grid line shall be used as the junction for construction, and the spraying thickness shall be controlled at about 4-5 kg/m2. Do not apply too thick or too thin to ensure consistent spraying effect, which can effectively avoid obvious interfaces, uneven thickness and color difference.
Construction conditions: the ambient and wall temperature is above 50C, the relative humidity is not higher than 85%, the wall moisture content is less than 10%, and the PH value is less than 10.
◆ Construction quality requirements of stone like paint
A: The spraying surface shall be flat, free of hairspray, efflorescence and color bite;
B: 1M front view, with uniform thickness and thickness;
C: No falling, lumps and splashes;
D: The front view color shall be consistent, without sand holes, scratches and missed spraying;
E: The decorative line and color separation line are dry and straight;
F: The surface of windows and other components shall be clean.
Step 6 Grinding:
After the stone paint is dry, grind the stone paint with sharp corners (about 30-50%) to increase the beauty of the stone paint, reduce the sharpness and avoid dust accumulation.
Step 7: Dust cover smooth finish construction:
The finish paint can be sprayed only after the main material layer is completely dry (generally 24 hours in sunny days). The air pressure of the air compressor is required to be more than 4kg. The muzzle of the spray gun is perpendicular to the wall, 750px-1250px away. Spray it back and forth evenly. The finish paint is generally sprayed twice. First, spray a thin and uniform layer without omission.
Open the tank and mix evenly, and use according to the water adding ratio or diluent specified for each model. It is recommended to use spraying construction, with spraying thickness of 0.1~0.125kg/m2. The dry film thickness is 30 μ m.
◆ Construction quality requirements of real stone paint
A: No blooming, no missing spray, consistent gloss;
B: No falling, lumps and splashes;
C: The surface of windows and other components shall be clean.
III. Precautions
1 Please select a professional stone like paint construction team. An experienced construction team plays a key role in the project quality.
2 Due to the heavy weight and large amount of stone like paint, large packaging size (75KG/barrel) is commonly used. When long distance transportation or storage time is too long, sedimentation will occur. Before barrel opening, the whole barrel should be stirred upside down. The construction viscosity has been adjusted before leaving the factory. It is not recommended to add water to dilute the viscosity.
3 It is recommended to use hanging basket to spray stone like paint. Scaffold joints will be left after spraying the scaffold, which cannot be seen without dismantling the scaffold, and will be obvious after dismantling.
4 Temperature: construction is usually carried out under the temperature above 5 º c and below 35 º c; Humidity: the air humidity suitable for construction is 60% - 70%, and construction is not allowed when it is more than 85% and rainy days; It shall be ensured that no rain is allowed within 24 days after spraying; No stone like paint can be sprayed when the wind force is greater than 4.
5 The air pressure of the air compressor should be more than 8kg, and the actual amount of coating will vary depending on the roughness of the base surface or different construction processes. Before construction, the coating rate shall be tested according to the site conditions.
6. Sand loss during spraying: no matter any spraying, there will be loss. Sand loss during spraying should be judged according to the viscosity of construction products, construction air pressure, construction personnel's methods, etc. It is recommended to conduct a coating rate test before the commencement of the project.
7 About the phenomenon of spray paint blooming: stone like paint blooming is more common, which is caused by uneven spraying, especially on dark paint. The color of the thick sprayed area is inconsistent with the thin sprayed area. It is recommended to spray thin for many times during spraying, and the blooming can be avoided by forming for many times.
8 About color difference: since stone like paint is basically prepared with natural colored sand raw materials, there will be slight color difference between batches, which is normal. It is recommended that the same batch of materials be constructed on the same wall with the same batch of people. The whole wall should be built from top to bottom in one go to avoid new and old colors caused by intermittent construction. The plane effect and the rough effect will produce sensory differences. Pay attention to the color differences of some colors under the conditions of backlight and positive light, direct sunlight and refraction. Repair of color difference: after the construction of a wall, try to leave several barrels of products of the same batch to repair the defective wall in the final stage of the project to avoid color difference caused by the final repair.
9 Whitening: There are two cases of whitening. One is the phenomenon of alkali returning on the concrete wall, and white powder will appear when you touch it with your fingers. Second, there is no such phenomenon when the roll coating of the gloss finish is not carried out. After the roll coating, the white appears, as if the fog is falling on the top, and the joints are relatively obvious. This is because the surface of the stone like paint is rough and uneven, and the roll coating of the gloss finish is not even, resulting in the accumulation of the finish in the groove. It is recommended to use spraying for the construction of the high gloss dust proof gloss finish.
