|
Arabic
Bengali
Chinese
English
French
German
Hebrew
Hindi
Italian
Japanese
Korean
Malay
Polish
Portuguese
Spanish
Turkish
Ukrainian
Vietnamese|
FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
Dry casein paints. Simple recipes and tips
Directory / Factory technology at home - simple recipes Casein paints are applied both to external, and to internal works. Before work, the paint is stirred with water, the casein is allowed to swell at normal or slightly elevated temperature; then, with further addition of water, the casein dissolves, after which it is ready for use, like glue or lime paint. This paint is suitable for painting stone buildings, plastered surfaces, wood, linen, canvas, etc. The solution of casein paint should not be left overnight, as it becomes unusable for work, as a result of which it is recommended to dilute the paint in small portions. Under casein paint, it can be primed with a soapy solution, as well as under glue, or with a very weak solution of casein. In most cases, they do without any primer. Casein paints dry quickly, give pleasant colors and a uniform matte layer. After the ink coat dries, casein loses its ability to dissolve in water, so water cannot wash it out of the ink film. The main constituent mass of Dry casein paints is chalk, kaolin, lime, gypsum and talc. To give the appropriate shade to the main composite mass, various coloring substances are mixed. These paints can be both mineral and organic (aniline). For light tones, the amount of the latter is an insignificant percentage in relation to the total mixture. Paints must be resistant to alkalis and lime. Some paints, when exposed to alkalis, change their color. So, for example, chrome green mixed with Prussian blue and chrome yellow is not applicable. Whenever possible, clean paints should be used. As for casein, it can be used both in-house and commercially available. In the manufacture of dry casein paints, which, when kneaded with water, give a ready-to-use paint, it is necessary, first of all, to choose the right amount of casein. Casein must bind the mineral bulk, as well as coloring matter, giving the appropriate shade. With an insufficient amount of casein, the paint will not have the appropriate strength, it will be easily torn off by hand, fade and not withstand the effects of precipitation. With an excess of casein, the colored surface can easily give stripes and, in addition, can also easily separate from the colored surface. The amount of casein also depends on the mineral paint used. Burnt earth colors require more casein than, for example, ocher and other unfired colors. Usually the amount of casein ranges from 10 to 20% by weight of the mixture. Thorough mixing of all components is essential, since if this condition is not observed, it may turn out that there will be an excess of casein in one part of the mixture, and a deficiency in the other, as a result of which the phenomena indicated above may occur. The recipes for the main compound mass are as follows. 1st recipe:
2st recipe:
All components should be in a fine powder state, which facilitates quick and thorough mixing. Caustic lime (slaked lime - Ca(OH)2) is obtained in the form of a fine white powder by pouring water over pieces of pure burnt lime (preferably from marble lime), in an amount of approximately 1/3 of the weight of the lime. The water temperature should be between 16 and 18 °C. Lime slaking is best done in stone or ceramic containers. The resulting slaked lime is stored in tightly closed containers or, if possible, immediately put into use. As for the addition of various mineral paints to the total mass compiled according to the above recipe, this is done in advance or before using the paint. Paints are used in the following varieties. Red: bolus, burnt sienna, iron mummy. Yellow: ocher, Sienese earth (terre de siena), Neapolitan yellow. Green: earth green, ultramarine green. Black: Frankfurt black, Parisian black, bone charcoal. Blue: ultramarine blue, lime blue, copper blue. For Composite Colors olive: 49 wt. hours of chalk, 25 wt. hours of ocher, 6 wt. h. Frankfurt mob. Gray: 60 wt. hours of chalk, 18 wt. hours of Frankfurt black, 2 wt. h. ultramarine blue. Pink: 60 wt. hours of chalk, 20 wt. hours of burnt sienna. lilac: 55 wt. hours of chalk, 10 wt. hours of red leucorrhoea, 15 wt. h. ultramarine blue. If the addition of paints occurs directly in production, it is necessary to reduce the amount of melted chalk. For example, in the case of using ocher, the main mass should be composed as follows:
The mixture must be perfectly uniform, which must be verified before the release of the goods by several trial colors. Immediately after preparing this mixture, the powder is packed in wooden boxes lined with paper, hammered, and in this form the powder can be stored in a dry place for a long time without changing its qualities. The preparation of paints is very simple, does not require much skill, and therefore it is very easy to achieve good results. Casein paints are very affordable. Preparation of a colorful solution can be done in any clean and grease-free container. To 100 wt. h. dry powder is added with continuous stirring in small portions of 50 wt. hours of water. The resulting mass is stirred until a homogeneous, lump-free mass is obtained. A little water is added to this mass so that it covers the surface of the mass, and left alone for 30-45 minutes. Then again, with stirring, water is added until the mixture reaches the consistency necessary for painting, i.e., approximately the consistency of oil paint; this result can be easily checked by test stains. For painting rough surfaces, the solution should be somewhat thinner, for smooth surfaces - thicker. After preparing the solution, it is necessary to start painting as soon as possible, since after 12 hours the binding ability of the solution almost disappears. To avoid such damage, the prepared solution must be applied on the same day. If, after a long standing in the dish, a film forms on the surface, then the latter must be removed, and not stirred with all the liquid. If you want to get paint of any shade, then mineral paint mixed with water into porridge is added to a solution of white casein paint. This porridge, with constant stirring, is added to the prepared thick solution of white casein paint. Stirring is carried out until the mixture becomes evenly colored. To select the desired shade, test colors are made. The success of the case depends on the strength and cleanliness of the painted surface. The paint fits well on lime, gypsum, cement plaster, brick, stone, wood, metals, canvas, etc. For interior work, it is useful to pre-clean the surface to be coated from dust and dirt. For this purpose, slightly used brushes and brushes free from dirt and grease can be used; they are also suitable for applying paint. The paint is applied in a thin layer in all directions, which achieves, on the one hand, a strong connection with the surface to be painted, on the other hand, an even color without spots. During painting, you need to stir the paint, as is done when working with oil paint. Drying is quite fast, and after 36-48 hours the painted surface can be washed. Due to its elasticity, it can be easily varnished, painted and painted according to patterns. On a durable surface, the paint won't crack or peel off; if there is old lime or glue paint, then you must first remove it. To give a matte surface of casein paint a high gloss and, consequently, to give it the appearance of an oil paint, the painted and dried surface is sprayed with a liquid solution of wax in turpentine; after drying, the surface is rubbed with a brush. This method can be successfully applied for interior work. To obtain a solution for 1 kg of dry paint, take about 2-3 liters of water. Depending on the type of surface to be covered, an area of approximately 6 to 12 m2 can be covered with this mortar (6 mg of rough plaster, 12 m2 of smooth wood). The stated advantages of casein paints, their low cost, ease of manufacture, resistance to water, ease of application and the possibility of varnishing, make them suitable for painting facades, interiors, residential buildings, schools, warehouses, factories, etc. They are suitable for painting stairs , corridors, various surfaces made of cement, brick, wood, etc. It should also be noted that the paint layer, due to its porosity, does not interfere with air circulation, which contributes to the drying of damp rooms. Author: Korolev V.A.
▪ Laundry detergents that do not contain soap (surrogate)
Artificial leather for touch emulation
15.04.2024 Petgugu Global cat litter
15.04.2024 The attractiveness of caring men
14.04.2024
▪ It's raining diamonds on Uranus
▪ site section Color and music installations. Selection of articles ▪ Article Hospital Pediatrics. Lecture notes ▪ article How did David Copperfield's skills help him avoid a mugging? Detailed answer ▪ article Queensland walnut. Legends, cultivation, methods of application ▪ article Experiments with a gyroscope. physical experiment
Home page | Library | Articles | Website map | Site Reviews
www.diagram.com.ua |
We recommend interesting articles Section 
See other articles Section 
Latest news of science and technology, new electronics:
All languages of this page