Natural colored sand (sand stones) and the true stone recipe

True stone Overview
True stone is a decorative effect resembles marble, granite. Mainly uses a variety of colors made of natural stone powder preparation. True stone buildings decorated with natural true natural color, to give elegant, harmonious, and stately, the beauty. Suitable for all types of indoor and outdoor decoration of buildings. Buildings, particularly in surface decoration, can receive vivid, back to nature effect. True stone has fire, water, acid, anti pollution. Non-toxic, odorless, strong bonding, never fade, etc., can effectively prevent erosion of the external harsh environment of the building to extend the life of the building, as true stone have good adhesion properties and resistance to freezing and thawing, it is particularly suitable in cold regions. True stone construction is simple, easy to time-saving, convenient for construction.
1, coating hardness
True stone coating construction dries very hard not to pull the nails. Generally true stone, if good weather conditions in the construction of three days can still use the nail to pull, should be seen as too soft coating. Mainly due to inappropriate choice of emulsion.
Preparation of true stone when they take the same and preparation of latex emulsion, which lead to true stone to the formula of the lower latex content, film due to the presence of a large number of sand makes the coating is not close enough. The coating of R & D: Preparation of the emulsion for true stone should not be less than the bond strength 3MPa, the minimum film forming temperature not lower than 15 degrees Celsius. A higher minimum film forming temperature may result in lower temperatures is not easy in the film's shortcomings, more film-forming additives through appropriate methods to solve. Additives in the coating film after drying completely volatile, generally will not affect the coating performance. True stone chosen is a high bond strength, the minimum film forming temperature higher emulsion, which has fundamentally solved the problem too soft coating.
2, good water resistance coating, stable color, no white, no color difference
Some true stone coating after each rain, are white, loose coating, but after the rain stopped by the sun in the sun, then restore the original color of the coating. In fact, this is due to poor water resistance of the coating, caused by absorbed water, formula because the acrylic emulsion used in the synthesis of surfactant required to join, some manufacturers in order to increase the stability of emulsions, surfactants used in agent greatly excessive; some manufacturers are added in the preparation of true stone carboxymethyl cellulose, hydroxyethyl cellulose and other substances as a thickening agent, and the addition of sodium benzoate as a preservative. These substances are water-soluble or hydrophilic, the coating film after the stay in the coating, the coating on the greatly reduced water resistance. Experiments show that the acrylic emulsion mixed with quartz sand, without any additives, spray coating formed, its water absorption was 0.42%; in the paint by adding 0.4% based on hydroxyethyl cellulose, water absorption increased to 4.3%. As the true stone of the coating thicker, when, after absorbing water, not easy in a short period of time release, thus creating the appearance of white, the result of osteoporosis within the coating. Chuan Lai true stone of optional coalescent ESE: silicone modified acrylic emulsion (acrylic emulsion). In the dry good water resistance, so coating does not occur with water in the dry white phenomenon.
Internal and external coating of the people with the requirement of higher natural true stone for its unique appearance and performance increasingly being loved, many high-end residential, garden or even finishing high-rise buildings are made of natural granite, marble and other natural Stone looks very similar to the true stone, in terms of performance requires a stronger hardness, waterproof, anti-aging. The following will briefly some of our experience and the natural real stone paint spraying technology aspects of the preparation of some experience. Coatings, inks, resins, adhesives, formula one, natural true stone almost natural true stone mainly polymers, natural stones and related additives made of sand, dry and cure as hard as stone, with the imitation of natural stone-like effect of real strong adhesion, weather, water, and the repair is easy, with complete closure of the construction of a anti-alkaline base oil, weather waterproof protection of surface oil.
Formula example:
1,1 Natural Stone Paint:
30% acrylic acid 65% of natural sand stones thickener plasticizer 1% Other 3% 1% additive
To join the emulsion, thickeners, plasticizers and other additives stir, slowly adding the natural stones in the sand mix well packaged.
Closed 1,2-anti-alkaline base oil:
Acrylic acid 60% water, 35% of the mold, preservative 2% 3% other additives
To join the emulsion and additives Stir, then add water, mix well packaged.
1,3-weather waterproof protection of surface oil:
A component
60% polyurethane resin coatings, inks, resins, adhesives, formulation
Butyl acetate 18%
Xylene 20%
UV dose of 1%
Other additives 1%
Stir mixture can packaging.
B component
HDI curing agent (75%) 66% UV, radiation, water, additives, pigments
Butyl acetate 34%
Stir mixture can packaging. (Note: surface oil Xuan A: B = 4:1 ratio mixture preparation, mix well before use, period of use can not exceed 8 hours, with the distribution with the use.)
Construction Overview
2.1 Construction equipment and requirements:
(1), air compressor: power 5 or more, sufficient volume, at least with three trachea, to meet three or more simultaneously.
(2), the next pot spray gun: Capacity 500ml, diameter 1.3mm or more, the capacity can not be too large, or too heavy to maneuver, while the construction of small diameter slow, may delay the schedule, not large scale construction.
(3), real stone paint spray gun: min single gun, guns, three gun, color selection according to different color with a single gun, two-color, multicolor with guns, three shots in order to adapt to different construction techniques, spray a more satisfactory results.
(4), various diameter nozzles: 4mm, 5mm, 6mm, 8mm, etc., according to the requirements of a model to select a different nozzle, the smaller the diameter the more effective the spray formation of uniform caliber will spend the greater the sense of the stronger punch.
2.2 Construction Process:
12 hours 24 hours grinding
Base oil spray spray twice ----- 2-3mm ----- true stone surface oil spray twice
2.3 Construction Specifications: UV, radiation, water, additives, pigments
(1), spray base oil: use pot under the gun, pressure 4-7Kg / square centimeter, the construction of not less than 10 degrees Celsius temperature, spray twice at interval of 2 hours, about 30 microns thick, dried at room temperature for 12 hours.
(2), spraying true stone: use real stone paint spray gun, air pressure control at 4-7 kg / square centimeter, construction temperature of 10 degrees Celsius, the thickness of about 2-3mm, For painting 2, 3, then the interval of 2 hour, dry 24 hours before grinding.
(3), polished: The 400 - 600 grit sand paper and gently smooth the true stone surface can be raised in the sand. Note that force is not too fast, without damaging the paint film, causing the bottom of the loose, poor adhesion will cause serious, true stone off.
(4), spray surface oil: use pot under the gun, pressure 4-7 kg / square centimeter, the construction of not less than 10 degrees, spray twice at interval of 2 hours, about 30 microns thick, completely dry, take 7 days.
2.4 Construction of the substrate and requirements:
Applied to concrete or cement wall and brick walls, there are asbestos-cement board, wood, gypsum board, polyurethane foam and other substrates. Construction of the substrate surface, grass-roots should be smooth, clean, and has good strength, the new wall should be hard work one month before the construction, renovation of the old wall, first leveling the grassroots, to remove loose, peeling, and dust the surface grease, etc. impurities before construction.
True stone coating technology
3.1 brick true stone: press to design a good size brick, and then a good base oil has coated the walls with a wood frame make brick-shaped model, the spray [1], in the true stone has not dried up before the table can under the wooden frame.
3.2 vertical spray: The circled method from 30cm-40cm, with a radius of about 15cm horizontal circling spray, spray gun from time to shake up and down so fast and uniform spray, and easy to control, if the use of rows of the main Overlapping spray, slow, difficult to control even the upper and lower junction will affect the appearance, resulting in coating defects.
3.3 Roman columns spray: because it is cylindrical, so use "M" linear spray, a little far away from about 40cm, the vertical cylinder to spray gun, top-down, spray a good side and then turned to the other side, steering angle of about 60 degree is appropriate.
3.4 square spray column: angular square columns, is easy to spray evenly Ershi for fuzzy edges, easy to spray, to spray angular distance of about 50cm, remote spray, fog, scattered flowers were open, large area and uniform, if the distance too close to the little carelessness will spray thick, uneven spray, so that angular lines can not be brought and lost the overall appearance of the original architectural beauty.
Small gourd 3.5 cylindrical spray: a small modern building with a cylindrical railings decorative gourd to do the majority of requests spray dere tar, because of its small size, very decorative, they are also more detailed spraying process. Decorative railings made gourd column, too close, some places simply can not face spray, so the normal conventional spray method can not achieve the desired effect. Use a small spray nozzle, a distance of about 40cm, fast casual spray true stone from top to bottom side to side spray, spray can not be positive, with the jitter gun approach, make it as far as possible around the spray dere tar, and then use hair brush Ping true stone, not spray can also be used to place a layer of brush cast a little, then spray powder spray again, not too thin nor too thick, cover Shuahen can, and can not play a very thin Good effect, thickness of the cover living beauty of the original lines, and cracks may appear undesirable appearances.
Process deficiencies and improved methods
4.1 Yin-Yang angle fracture: true stone coating process, sometimes cracks corner of yin and yang, yin and yang angle for the two personally *, if the spray dere tar, during the drying process there will be two different directions at the same time the role of the tension Yin corner of the film at, easy to crack. On-site solution: the yin and yang found crack angle, with a thin cover spray gun spray again, repeat it and then spray it again half an hour, until the cover cracks; yin and yang of the new spray angle, then pay special attention when spraying a spray can not be thick take thin multi-jet method, that is, re-spray the surface after drying, spray gun long distance, faster movement, and can not spray the vertical angle of yin and yang, but to take scattering, that is spraying two side edges of mist flower sweep Yin and Yang into the corner.
4.2 Plane cracks: the main reason may be due to temperature difference between the weather suddenly cools, resulting in different internal and external layer of the drying rate, surface dry and form cracks in non-intervention, on-site solution is to use mouth spray gun, spray thin multi-layer, best to control the drying rate of each floor, spray a little far away for good.
4.3 cracks during the fabrication process: in the painting, the cover is not enough or even too thick, the coating surface after the film cracks, or even weeks after a number of Sha cracks, concrete analysis of this situation would not only pay attention to construction spray methods, when necessary, to change the formula, re-trial.
True stone of the market analysis
5.1 Natural true stone of the production process is simple, low cost, performance, development of prospect to a higher grade. Such as environmental protection, high elasticity, non-stick dust and other series.
5.2 high-grade true stone must be matched strict construction technology, manufacturers of paint even though the quality is good, but lack of experience if the construction workers, low quality of different manufacturers do not understand the true performance of stone or paint does not fully understand, can also cause problems.
5.3 To meet the increasingly high-grade construction decoration individual development needs, such as imitation marble, imitation granite paint and more show the importance of spraying, only better, more complete construction process, to fully demonstrate true stone's unique appearance and superior performance.