No matter what shape it is, you should scrape putty.
I. Process flow of real stone paint
1. Substrate surface treatment
2. Batch leveling putty
3. Roll-coating alkali-resistant primer or sealing primer (black or same color base)
4. Ditch and joint frame treatment
5. Spraying super weather-resistant real stone paint
6. Spray dust cover topcoat (water-based or oily)
Second, the construction guide
The first step is substrate surface treatment.
Because the condition of the base surface is directly related to the construction quality of Rong Jian stone paint, the base surface must be carefully inspected and accepted before decoration.
The specific requirements are as follows:
1) The newly built new wall needs to be fully cured and dried; For the old wall that has been peeled off by moisture, it needs to be repainted.
Layer by layer, and then a series of spraying construction can be carried out.
2) The base surface shall be smooth and clean, free of oil, floating ash or other pollutants.
3) The original old paint on the old wall or other base surface shall be tested to confirm its adhesion; If the adhesion is poor, it must be completely eradicated.
Basement acceptance criteria:
1. Surface flatness: generally, it is required that the dislocation is below 3 mm, and if it exceeds this range, it needs to be polished and smooth.
2. No delamination, hollowing, surface crack, wind crack not greater than 0.2mm, obvious sand holes and other defects.
3. The surface plastering has reached an advanced level, that is, the verticality of the production surface is not more than 3mm, the surface flatness is less than 2mm, the verticality of the angle of Yin and Yang is less than 2mm, and the founder is 2 mm.
4. The surface must be smooth, clean, uniform in color, without cracks, obvious joints, dust, oil stains, exposed steel bars, iron wires, sawdust, red corners and gray lines, straight and square, clear and beautiful.
5. Corner protectors shall conform to the construction specifications, and the width and depth of separation joints (strips) shall be uniform, smooth, with neat edges and corners, horizontal, flat and vertical.
6. Basicity of the base: the PH value of the base wall is lower than 10.
7. Moisture content of base course: the moisture content of base course is less than 8%, and it takes about 3 weeks to construct a new mortar surface course.
8. Surface dirt: surface dust, oil stain, etc. It should be removed by wire brush, synthetic detergent, etc. Or polished with coarse emery cloth, and construction can only be started after cleaning and polishing.
Step 2: Scrape the putty in batches and polish it.
(1) batch of putty shall be constructed by trowel, scraper or steel batch, and scraped from top to bottom. Every time the putty can't be scraped too thick, it is easy to crack and fall off. Usually, the putty for external walls is about 0.5 ~1.0 mm.
(2) Generally, the putty is scraped twice in batches, and the interval between the two putty cannot be too short. After the first putty is dry, be sure to scrape the second putty.
(3) When scraping putty, don't scrape it back and forth too much, so as to avoid peeling, falling off or squeezing out the rubber compound in putty, and the cover is not easy to dry.
(4) When scraping putty, pay attention to the technique, press the blade with your index finger, press the putty into the defect, fill it up, and scrape putty around to minimize the traces of putty.
(5) After the putty is completely dried (usually in sunny days 12 hours), polish it with corresponding sandpaper and clean the dust.
Step 3: Exterior wall primer construction: (exterior wall alkali-resistant primer or sealing primer)
Painting exterior wall primer is the third process in painting structure. After brushing, a coating film is formed on the putty layer, and the particle size of the emulsion is extremely small, which can penetrate deeply into the coated base. It has the following functions:
Primer can quickly penetrate into the base material and the putty layer to form a tightly sealed isolation layer, and the paint film has good flexibility, which can effectively prevent external substances such as acid, alkali, water and oil from eroding the wall, achieve the best pH value balance, effectively prevent the paint film from falling off, flashing alkali and frosting, and also prevent the mold bred by the base material or the putty layer from oozing out, thus affecting the decorative effect of the external wall. Improve the adhesion and hiding power of the top coat, and at the same time, color paste can be used to color, saving the top coat of the outer wall.
Suitable for outdoor substrates, such as cement, masonry, concrete and other new and old walls, especially for new walls and walls with heavy alkaline substrates.
| Structure proportion: See the product specifications of various models for details.
Brush coating or roller coating: dilute with water and stir evenly. It can be properly adjusted according to the construction difficulty and the environmental temperature, and excessive dilution is not allowed.
Ordinary spraying: add 5 ~ 10% water to dilute and stir evenly.
| airless spraying: it is not recommended to dilute with water.
The adjusted materials should be left standing for 10 ~ 15 minutes, and then stirred evenly to obtain better construction effect.
Theoretical brush area: 8- 10m2/ pass
Construction method: brush coating, roller coating and spraying can be used. Only when the construction thickness (wet film) is greater than 30μm can the best effect be achieved.
Building strips: the ambient temperature and wall temperature are above +50C, and the relative humidity is not higher than 85%. The water content of the wall is less than 10%, and the PH value is less than 10. The next process can only be carried out after the primer is completely dried.
Primer acceptance criteria:
Appearance inspection surface is smooth, flat, even and clean, without sand holes, obvious brush marks and missing coating. And the overall appearance is good.
Step 4: Trench and joint construction.
1. Leveling the wall surface according to the design requirements, measuring the dimensions, threading with ink cartridges, positioning and sticking masking paper for protection.
The fifth step is the construction of real stone paint:
After opening the can, pour it out and mix well. It is suggested to construct directly without dilution with water. If it is necessary to add no more than 3% water, please do not pour the diluted real stone paint back into the original packaging, and use up the opened products as soon as possible. According to the requirements of spraying effect, select appropriate caliber spray guns, small caliber spray guns Ф 2 ~ 4 ㎜, medium caliber spray guns Ф 4 ~ 6 ㎜, large caliber spray guns Ф 6 ~ 8 ㎜, and the nozzle is 40 ~ 50 ㎝ away from the wall. Generally, when spraying, adjust the pressure of the air compressor to about 4 ~ 7 F. For the spraying process of different shapes of real stone paint, the specifications and sizes are designed according to the requirements, and then the required model is made with masking paper on the wall surface with the primer coated, and the real stone paint is sprayed, and the masking paper is torn off before the real stone paint is dried completely. When spraying in a large area, take the grid line as the junction, the spraying thickness should be controlled at about 4-5kg/m2, and the spraying effect should be consistent to effectively avoid obvious interface, uneven thickness and color difference.
Building strips: 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 real stone paint
A: the spraying surface is smooth, without blooming, flashing and color biting;
B: 1m, uniform thickness;
C: No sagging, no pimples, no splashing;
D: The color on the front is consistent, without sand holes, scratches and missed spraying;
E: decorative lines and color separation lines are straight;
The surfaces of windows and other parts are clean.
Step 6: Polishing:
After the stone paint is dried, the sharp particles on the surface of the stone paint are smoothed (about 30-50%), which can increase the aesthetic feeling of the stone paint, reduce the sharpness and avoid dust accumulation.
Step 7: Construction of glossy finish of dust cover:
Top coat can only be sprayed after the main material layer is completely dried (generally 24 hours in sunny days). It is required that the air pressure of the air compressor should be above 4kg, the muzzle of the spray gun should be perpendicular to the wall, and the distance should be 750px- 1250px. Top coat is usually sprayed twice. Spray a thin layer evenly first, and don't miss it.
Open the can and stir evenly. According to the water adding ratio or diluent specified in each model, it is recommended to adopt spraying construction, and the spraying thickness is 0. 1 ~ 0. 125 kg/m2. The dry film thickness is 30μm m. ..
◆ Construction quality requirements of real stone paint oil
Answer: No blooming, no leakage and consistent luster;
B: No sagging, no acne and no splashing;
C: The surfaces of windows and other parts are clean.
Three points for attention
1 Please choose a professional real stone paint construction team, and experienced construction teams play a key role in the project quality.
Real stone paint is usually packed in large size (75KG/ barrel) due to its heavy weight and large dosage. When it is transported for a long distance or placed for a long time, precipitation will occur. The whole barrel should be stirred evenly before opening, and the construction viscosity has been adjusted before leaving the factory. It is not recommended to add water to dilute viscosity.
3. It is recommended that the hanging basket be sprayed with real stone paint. Scaffolding spraying will leave scaffolding joints, which are invisible without dismantling scaffolding, especially after dismantling scaffolding.
4 temperature: usually at 5? C over 35? Construction at the temperature below c; Humidity: the air humidity suitable for construction is 60%-70%, and construction is not allowed when it is above 85% and rainy days; Ensure that you can't get wet in the rain within 24 hours after spraying; If the wind force is greater than 4, you can't spray real stone paint.
The air pressure of the air compressor should reach more than 8kg, and the actual coating amount will be different due to the roughness of the base surface or the different construction technology. Before construction, the coating rate should be tested according to the site conditions.
6 On the problem of sand dropping during spraying: No matter any spraying, there will be loss. The phenomenon of sand falling during spraying should be judged according to the viscosity of construction products, construction air pressure and the method of construction personnel. It is recommended to test the coating rate before the project starts.
7. About the phenomenon of painting halo: The phenomenon of real stone paint halo is more common, especially on dark paint, where the color of thick place is different from that of thin place. When spraying, it is recommended to spray thin for many times, and multiple molding can avoid frosting.
8 About color difference: As real stone paints are basically prepared with natural colored sand raw materials, there will be slight color difference between batches, which is a normal phenomenon. It is suggested that the same group of people construct the same batch of materials on the same wall during construction. The whole wall should be completed from top to bottom in one go to avoid the old and new colors caused by intermittent construction. There will be a sensory difference between the flat effect and the matte effect. Pay attention to the chromatic aberration of some colors under the conditions of reverse light and positive light, direct sunlight and refraction. Repair color difference: after the construction of one wall is completed, try to leave a few barrels of the same batch of products, so as to repair the defective wall in the final stage of the project and avoid the color difference caused by the final repair.
9 whitening: there are two situations of whitening. First, the concrete wall returns to alkali, and there will be white powder when your fingers touch it. Second, there is no such phenomenon if the topcoat is not roller coated. It turns white after roller coating, just like there is fog on it, and the seams are obvious. This is because the surface of real stone paint is rough and uneven, which will cause the top paint to accumulate in the groove. Spraying is recommended for the top coat of high-gloss dust cover.