This article introduces that the colored sand paint is sintered at high temperature; it is made by roasting clay and pigment; it is made by crushing natural colored stone.
According to Japanese data, a binder with inorganic condensed aluminum phosphate as the main component and an inorganic or organic pigment are added to the quartz sand, stirred and mixed to make the surface of the quartz sand colored, and dried and fired at a low temperature for a certain period of time to obtain artificial colored sand. . For example, add 100 parts of quartz sand (weight ratio) and 1.53.0 parts of binder (containing more than 50% of inorganic condensed sulphate, and the rest is water) in the mixer, and stir for 10 to 15 minutes at a weight of 100 to 200 kg. Then add 1.01.7 parts of pigments of the required color such as iron oxide red, chromium oxide green, chromium oxide blue, etc., and then mix and stir (K) 15mm to make a mixture, which is fed into the rotary kiln from the hopper, at 15t) 9501: Burning at high temperature can make artificial colored sand. The above technology can also use organic pigments such as phthalocyanine, thioindigo, dioxycyclohexane, quinopiperidone, coupled azo, condensed azo, etc.
Ordinary aggregate: it plays a role in coloring in paint, and the ordinary aggregate referred to here is quartz sand and dolomite sand. Colored aggregate is used alone, and its color is relatively dull. A certain amount of quartz grains can be used in combination with colored aggregates to adjust the color depth, so that the coating tone has layers and can obtain a texture similar to natural materials. At the same time, product prices can also be reduced.
Aggregate requires a certain thickness gradation. Coating with too many coarse particles will cause pinhole voids, and it is also easy to accumulate dust and pollution. The texture of all coatings with fine sand is not very good, so it is advisable to adopt a reasonable gradation with fine sand as the main part and appropriate addition of coarse grains. The advantage of this is that it is beneficial to prevent pollution, and the decorative texture is more satisfactory. The thickener acts as a thickener in the paint to ensure that the aggregate can be in a suspended state in the emulsion and reduce the sinking phenomenon.
Film-forming aid Adding film-forming aid to colored sand paint can reduce the film-forming temperature of the emulsion to about 5t'. Commonly used film-forming aids are propylene glycol, benzyl alcohol, etc.
Antifungal agents and preservatives can prevent the paint from becoming moldy, smelly, and reducing viscosity. Sodium pentachlorophenate and sodium benzoate are often used.
The mixing ratio (weight ratio) is 46; the water is properly sieved.
Preparation method Compared with general emulsion paints, the particle size of aggregate used in colored sand paint is several times larger than that of fillers. As a result, the prepared paint is easy to precipitate and has poor storage stability. Therefore, one-component and two-component packaging methods can be used. The former is to make emulsion, various additives and aggregates into paint in advance, and deliver them to the construction site in one package; the latter is to formulate emulsions and additives into a base material with appropriate consistency, and color aggregates and ordinary white aggregates According to the predetermined coating color requirements, it is formulated into aggregate, delivered to the construction site in two components, and can be used after mixing on the construction site. The two-component form is more advantageous because it can prolong the shelf life of the coating and avoid sedimentation.
If single-component packaging is used, the preparation method is the same as that of general emulsion paint; if two-component packaging is used, the preparation method of the paint part is similar to that of other emulsion paints.
Main technical performance: -5X: no deterioration; heat resistance: 601C constant temperature for 8 hours without abnormality; freeze-thaw cycle 30 times without abnormality; storage stability at room temperature without deterioration for 3 months; adhesion strength 1.5MPa; water resistance: 500h without abnormality ; Alkali resistance: 300h no abnormality; acid resistance: 300h no abnormality; aging resistance: 250h no abnormality.
Main points of construction application technology Wall base treatment Brick base treatment: remove dirt, damp with water, and then use cement, lime, sand mixed mortar to plaster the base, the mixing ratio is 1:1:6. Use an iron trowel to smooth, calendering. At the same time, it is better to use a brush dipped in water to brush the bristle surface, and maintain it at room temperature for more than 14 days. Spraying can only be carried out when the moisture content of the base layer is lower than 10%.
Concrete base treatment: clean the surface dust and oil. For concrete slabs with oil stains, first use 10% caustic soda water to spray off the oil stains, then rinse them with clean water, and apply plaster after they are damp. The operation requirements of cast-in-place or prefabricated concrete slabs are the same as those of brick base treatment; if there are large holes or hemp on the surface of prefabricated concrete slabs, 20% of 107 glue-mixed cement should be used to make putty, and the holes should be filled. Flat, use a brush dipped in water to brush the bristle surface, maintain at room temperature, and spray paint after the ash layer is dry.
Spraying preparation checks to deal with the hollowing of the base layer and whether there is asphalt, lime paste and other oil stains on the surface, and remove the concrete slag at the same time.
Coating slurry can be prepared in advance or temporarily prepared at the construction site.
The ratio should be accurate, mix thoroughly, let it stand for more than 4 hours, and fully stir before spraying. The consistency of the paint slurry is based on the principle that it is atomized after spraying and does not flow when sprayed on the wall. 8.3 Spraying operation should choose good weather construction. The temperature of the base surface of the wall during the day is above VC, and the temperature of the base surface of the wall (VC) at night is to prevent poor curing and freezing. When the wind force is above level 4, do not spray construction, and avoid rain within 12 hours after construction.
Spray horizontally from left to right, and must not spray randomly. The nozzle is about 50mm away from the wall and perpendicular to the wall. The moving speed of the spray hopper should be balanced and stable. The thickness of the coating is 13mm. The stubble should be consistent with the thickness of other parts to keep the color consistent. If you want to brush the overcoat with silica sol, etc., you need to pay after the coating is cured.
Doors, windows, glass and other non-sprayed parts, if paint has been splashed, should be wiped off with a damp cloth in time.
Tools such as spray hoppers, spoons, mixers, buckets, and baffles should be cleaned with water in time. (Yuan Jinsheng) Mixed apricot; Cheng Yixiangfang Bee hemp surface repair method If the concrete surface is plastered or painted, it does not need to be repaired; otherwise, it should be sprayed with water on the pockmarked surface to moisten it, and then it should be plastered with the same grade of concrete as the mortar. Smooth out the pumice.
Honeycomb repair method ① After cleaning the small honeycomb, use 1:2 cement mortar to plaster and compact it. ② For larger honeycombs, the weak parts and protruding aggregate particles should be chiseled off, cleaned with a wire brush or pressure water, and then set up; Pack and tamp carefully.
The hole repair method is to remove the loose concrete and weak grout around the hole, wash it with pressure water, set up the formwork, and tamp it with the first-grade fine stone concrete of the original grade after it is wet.
Exposed tendon repair method After cleaning with a wire brush or pressure water, apply 1:2 cement mortar on the surface to fill the exposed tendons and then smooth it; if the exposed tendons are deep, chisel off the weak concrete and protruding aggregate particles, and then wash clean Finally, it is filled and compacted with fine stone concrete of the original label.
Crack repair method ①The small seams on the surface should be filled with epoxy grout or sealed by surface painting after cleaning and drying. ② Larger joints should be chiseled along the longitudinal joints, and filled with 1:2 cement mortar after cleaning or filled with epoxy cement after drying.
