Guzhenko Artyom
In this work, the student is trying to find out whether the black color really attracts the sun's rays more strongly, and the white one repels them.
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Research work on the topic "Black or White?"
Head: Ovsyannikova M.N.,
Primary school teacher
One hot summer day, Mom and Dad and I decided to go for a walk. I put on a black T-shirt and a dark cap, but my mother said that I would be hot in these clothes, since the black color attracts the sun's rays more. I, of course, listened to my mother and changed into light clothes, but decided to think about this issue. Why then do people with black skin color live in African countries, because they must be very hot. And why do polar bears live in the cold north, probably they are cold?
Problem
Is not it White color reflects the sun's rays, and black "attracts" them?
Hypotheses
Perhaps the rays "do not see" the white color?
Let's assume that dark clothes are just brighter and more noticeable.
Let's assume that this is just a superstitious omen.
Target
Find out if the black color really attracts the sun's rays more strongly, and the white one repels them.
Tasks
Get acquainted with additional literature and Internet materials on this issue;
Contact a physics teacher for advice;
Conduct an experiment to confirm or refute this issue;
Prepare a presentation - a report on the work done.
Theoretical part
First, I decided to find out why people with black skin live in Africa. If black attracts the sun's rays more strongly, then you will not envy these people ...
From books and encyclopedias, I learned that according to ancient legend, before all people had black skin color. One day they discovered a lake with water that stained a person white, which was no longer washed off after. People went to this lake and, having plunged into it, acquired a white skin color. When the turn came to the inhabitants of Africa, there was already so little water left in the lake that they could dip only the palms of their hands and feet into the water. That's why Africans are black.
There is another explanation why there are people with black skin in hot countries, which is more like truth than legend.
It turns out that the skin of such people is rich in melanins, that is, substances that are found in the skin, human tissues, hair, and even the retina of the eye. Melanins are widely distributed in plant and animal tissues. They determine the color of the skin and hair, for example, the color of horses, the color of bird feathers, and fish scales. Melanins also absorb ultraviolet rays and, accordingly, protect tissues from burns. That is, nature itself figured out how to protect the inhabitants of hot countries from burns and made them black .... So, people with dark color the skin is better protected from ultraviolet radiation than from light or heat. That's the whole question...
But why do polar bears live in the cold north? It is very cold in the habitat of these predators, so every ray of sunlight that gives warmth is valuable. And the white color of the bears' fur must reflect light well - dark wool would heat up much better. But then the bear among the ice and snow would be visible from afar. There is no one to be afraid of a predator - with its size, it simply has no enemies. After the ban on hunting polar bears, they stopped being afraid of people. But camouflage on the hunt is very much needed. Indeed, among the snow-white landscape, only black eyes, nose and lips give out a bear approaching prey.
It turns out that the skin of a polar bear is black! But how does light make its way to the body through a thick fur coat? In fact, the hairs are hollow (empty) inside, and the rays easily reach the black skin, to which they transfer heat.
From additional literature and from a physics teacher, I learned that all colors found in nature are divided into achromatic (colorless) and chromatic (colored).
Achromatic include white and black, as well as all gray colors, which are obtained by mixing white and black colors. There are no achromatic colors in the spectrum. In nature, there are no such bodies that would completely reflect the entire light flux falling on them, and all bodies absorb light to one degree or another.
Black and white colors reflect light differently. Magnesium oxide powder, which is the whitest object, has the strongest reflection.
But black velvet absorbs light best, it seems to us the blackest object.
Practical part
To make sure the surfaces dark color absorbs light better let's do an experiment.
We will need two plastic bottles with screw caps. We paint one bottle black, wrap the other with white tape. Let's hang the bottles with their necks down, put them between them. table lamp. It should be located quite close to the bottles, at an equal distance from each.
With an awl, we will make holes in the plugs, insert transparent hoses into them. We hang the free ends of the hoses at the level of the bottom of the bottles. As a result, each bottle with a hose should resemble the English letter "U".
Now the resulting structure must be filled with water. Remove the bottles, disconnect the hoses. Pour water into the first hose to half, pour it into a bottle. For clarity, add potassium permanganate to the water. We twist the cork, insert the hose and hang the bottle. Liquid will fill lower part hose. We will do the same with the second bottle. When the whole structure takes its initial position, the liquids in the two hoses should be at the same level. Turn on the lamp and see what happens.
Result
After turning on the lamp, almost immediately the water began to move in the hose, which is connected to the black bottle. She climbed up the hose and began to go outside. The water from the tube attached to the white bottle rose slightly. What follows from this? The switched on lamp heats the bottles and the air in them. When heated, the air expands and pushes against the water in the hose. Under air pressure, it rises and reaches the tip of the hose the faster, the faster the air heats up, and, consequently, the surface of the bottle itself. From experience it can be seen that the first to reach the finish line was water from a hose connected to a black bottle. In addition to color, the bottles did not differ in anything, the experimental conditions for them were the same. It follows that black surfaces heat up faster.
conclusions
Thus, the hypotheses that the rays "do not see" the white color, that dark clothes are simply brighter and more noticeable, or that this is just a superstitious omen, have not been confirmed.
As a result of the experiment, I found out that black absorbs light better than white. So, really, in hot sunny weather, you need to wear light-colored clothes.
Practical significance
The materials of the work can be used in the lessons of the surrounding world and for conversations on the prevention of sun or heat stroke with children in a summer health camp. ;
What is a selective coating for a solar collector?
The thing is that the selective layer is the most important element in the system, which is responsible for the maximum absorption of heat.
Therefore, if you want to make a solar collector with your own hands, you will need to find this chemical or selective paint to paint the collector absorber.
From compliance with the technology, the correct spraying of light-absorbing paint, the reflection of sunlight will be minimal. This means that your collector will be more efficient.
As a rule, at home, ILIOLAC selective paint for solar collectors is used, which must be applied to the appropriate primer.
Usually the coating is applied sprayer at an air pressure of 3-5 bar. After staining, after a few hours, the material can already be worked on.
selective paint it is essentially a fast drying industrial coating for solar collectors with a very high degree of absorption.
In addition to the main special properties, the coating protects the product well from corrosion and has excellent film hardness.
Thus, by purchasing a special paint, the procedure for increasing the efficiency of a solar collector can be done independently, with your own hands.
Some craftsmen make a selective coating on volumetric planes, with such forms they want to use more angles for sunlight to enter the drive.
Selective coating for solar collector - price
Many are concerned about the question: selective paint for solar collectors where to buy?
Selective coating for solar collectors can be bought in specialized stores. You can also search for information on the Internet.
The cost of selective paint is quite decent, but as a rule the price depends on your region of residence and the greed of the seller.
For example, in Russia, selective paint for solar collectors can be bought within 1000 rubles per can.
In Ukraine, such coverage will cost the buyer about 350 hryvnia.
Note about selective paint! Natural copper oxide (if you have a copper absorber) Cu2O - has an absorption of 75% and a reflection of 33%. So we have an efficiency of 75-33 = 42%. 4 times better than painting with black paint.
It turns out that copper itself has excellent selectivity, so the advantage in the manufacture of a collector for heating water should be given to this particular material.
There is also a special selective coating with anti-convection effect. Such a miracle chemical reduces convective heat transfer. Such a coating requires special preparation of a glossy surface so that it reflects the sun's rays well.
Video how the solar collector works in winter at -15 frost.
solar-batarei.com
Selective coating for solar collectors
The most important part of any collector - flat, vacuum, air - is the absorber. It is the absorber that converts the energy of solar radiation into thermal energy. In flat water and air collectors, the absorber is generally a metal sheet, painted black with selective paint for solar collectors. Moreover, in the air collector, the absorber can be made with ribs to increase the area of the heated surface. In vacuum collectors, absorbers are thin plates in vacuum tubes. In flat water and vacuum collectors, absorbers transfer the accumulated heat to the coolant. In air collectors, they simply heat up to high temperature air in the manifold. But in any case, the absorber coating plays the most important role in the heating process.
Black color - black color is different
Some craftsmen apply a selective coating for solar collectors with their own hands, naively believing that by painting the metal sheet with black paint, they will solve all problems. But black paint is different. And how efficiently the collector will work depends to a large extent on what kind of paint the absorber is coated with. The fact is that black paint various formulations react differently to sunlight. Some of the solar energy is absorbed and some is given off as thermal radiation, and the resulting efficiency will be very low. So, for example, the efficiency of an absorber coated with ordinary black paint is only 11%, while when coated with other types of paints, the efficiency can exceed 90%. In addition, ordinary black paints do not have heat resistance and, with prolonged heating, they begin to exfoliate, lag behind the base.
How different coatings work
There are only two main indicators that characterize one or another black paint for absorber coating. This is, firstly, the ability to absorb solar energy and, secondly, the ability of the surface coating to emit energy in the long-wave range. The higher the first indicator and lower the second, the more effective the coverage. So, for example, two layers of Black Nickel over a nickel-on-mild steel plating (according to the technology, the part was immersed in boiling water for six hours) showed an absorption capacity of 0.94. In this case, the radiation capacity was only 0.07. Or "Black Nickel", containing oxides and sulfides of nickel and zinc, deposited on polished nickel, has an absorption capacity of 0.910, with an emission capacity of 0.11.
New compositions, new methods for obtaining highly efficient absorbers
Over the search for lineups heat-resistant paints, capable of absorbing solar energy to the maximum, many scientists are working. In Germany in 1980, Dr. Wolfgang Cesial and engineer Gustav Kroz received a patent for a "Method for obtaining selectively absorbing surface areas for solar collectors and a device for implementing this method." Their work has been further developed and backed by patents received in 1998 and 2001. The aim of these and other similar developments is, firstly, to achieve a high degree of absorption, and hence a high degree of conversion of incident sunlight into useful heat, and secondly, achieving a minimum emissivity, that is, low thermal radiation.
For the manufacture of high-performance coated absorbers, special technologies obtaining selective paints and methods for their application on the surface of absorbers, which, moreover, can be made from various materials. By the end of the nineties of the last century, these were mainly electroplated layers of the so-called “black chrome” or “black nickel”. In this case, quite encouraging results were obtained for these coatings, namely, the quality of absorption is up to 96%, the percentage of radiation is about 10%. These were very good numbers.
Developed in the mid-nineties in Germany, selective coating methods used a vacuum deposition process on the substrate. Experiments were carried out with the deposition of titanium-oxynitride on a copper base, as well as ceramic coatings. Later experiments were carried out with aluminum sheets. These coatings during control measurements showed the value of the absorption of solar radiation in excess of 95%, and the value of the emissivity - in the range from 3% to 5%. But, despite such high rates that were obtained for "Black Nickel" and "Black Chrome", these coatings did not find application in the European market, since the production of these coatings caused quite noticeable environmental pollution from the use of electroplating in the production process. The same fate befell the Black Crystal selective coating developed in the USA.
Selective coatings at home
Before you decide to apply a selective coating on an absorber yourself, you need to carefully study the characteristics of the available coatings and weigh your options. If something does not suit you, it is better to abandon this idea and buy ready-made collectors. There are many ways to apply coatings, but not all of them may be suitable. For example, some craftsmen, without going into details, simply cover a metal sheet with ordinary black paint just because this paint is, firstly, black, and secondly, cheap. But such paint will bring little benefit, since it is not heat-resistant, and when dried, it still becomes a good heat insulator. Black matte car paint has a fairly good light absorption, reaching 70%. The disadvantage of this paint is poor heat resistance.
The paint and varnish industry produces black matte paints with increased heat resistance. Such paints cover grills, barbecues manufactured by various companies. These paints can be both in cans and in aerosol packaging. Preferably, of course, paints in aerosol packaging, since in this case it is possible to apply a selective coating that does not exceed a few microns in thickness. When buying, you need to pay special attention to the method of coating, since the use of some types of paints requires pre-treatment the surface on which they will be applied. In some cases, an anti-corrosion surface treatment is required, and in some cases an acid primer is required.
Iliolac paint
Currently, the most popular paint for applying a selective coating is Iliolac (Iliolac) produced by the Greek company Stancolac. Manufacturers claim that this paint has an absorbency of 99%. This paint is available in cans, so to apply it to the surface of the absorber, it is better to use an airbrush to get a layer no thicker than fifty microns.
Selective film in rolls
Finally, a selective film can be used to cover the absorber. This thin, heat-resistant film, produced in rolls, is glued to the previously degreased and cleaned surface of the absorber. This film is a copper or aluminum foil with a ready-made selective coating deposited on it by vacuum deposition.
There are no particular difficulties in applying selective coatings, and if you decide to do solar collectors with your own hands, then a well-made device will work no worse than its industrial counterpart.
Paint for solar collectors
The energy of the Sun is gradually gaining its admirers, who install collectors on their home or territory. This is not surprising, because this method of generating electricity is quite effective, because it does not require regular financial injections and is environmentally friendly. To increase the absorption of direct rays, paint for solar collectors is used. It helps to protect the surface from the negative effects of oxygen and extend the life of the surface.
Improved Energy Gain
The main characteristics of selective paint for solar collectors is that it is easy to apply, and after that it dries quickly. Often the owners of this way of earning complain that the surface weakly absorbs energy.
To solve this problem, it is necessary to apply suitable coating, which will increase the absorption efficiency up to 99%. It is profitable to buy paint for a solar collector, because, like any enamel, it additionally protects against corrosion, and also has the following characteristics:
The color of the coating is black, iridescent with a matte sheen. An important advantage that solar collector paint has is its low consumption. A liter allows you to cover 11 square meters. The surface dries in 4 hours, and after 2 days it will completely harden.
Competent use
What needs to be done to the surface before applying the paint? Be sure to clean the solar collector from layers of grease, dirt, and also get rid of dust. When you pour the coating into the container, it should fill it throughout the entire volume. Buying solar collector paint will be much better than a two-component coating, which is not recommended for use. There are several ways to effectively apply:
It is important to consider that with each method it is necessary to dilute the solvent in the paint by 20% by volume. Optimum thickness film, so that it quickly fixes and dries, is 50 microns. The master is advised to monitor the temperature in the room, because it should not exceed 35 degrees above zero.
The main advantage that paint for a solar collector has is the price. The substance is consumed economically, therefore, in terms of cost, it allows significant savings. Thanks to the improvement in battery efficiency, the purchase will pay for itself after a month of intensive use.
The collectors work quite simply: the antifreeze that fills the tubes of the structure is a coolant and heats up from the ingress of infrared rays and ultraviolet radiation onto a special panel - a trap. The heated antifreeze moves to special heat exchangers, and batteries, where they transfer heat to water. The water itself is subsequently pumped into the heating main.
What is selective coating
Selective coverage: what you need to know
There is also an anti-convection selective coating that reduces the return of thermal energy to the environment.
Note! To increase the efficiency of the solar system, care should be taken that its polished parts are necessarily covered with a selective composition - after all, they reflect the sun's rays like a mirror.
Other types of coverage
Selective coating on absorber surface minimizes radiation losses
In addition to ready-made products, as a selective coating, you can also apply:
selective cover
Separately, it is worth mentioning the most popular, perhaps, selective coating - namely, Selective-Сover Silver Mirror. It is one of the best reagents that absorb solar energy.
It has the following characteristics:
- selectivity index 16;
- reliability, ease of use;
- operating temperature up to 365ᵒС;
- 6 m² for electrochemical application;
- 2 m² at contact.
- high selectivity coefficient (75-90%).
- Liter of water.
- 15 g potassium persulfate (K₂S₂O₈).
- 50 g of caustic soda (NaOH).
DIY selective coating
So, we found out that a "bare" absorbent coating (which often acts as an oxide film of Cu₂O) cannot be left.
But for more effective work solar collector, it is desirable to cover the surface with copper oxide CuO, which has significant advantages:
In a word, this is a very effective electoral tool that you can easily prepare with your own hands. Therefore, we will focus on it.
Note! Of course, copper oxide is very far from the quality of factory coatings, but in any case it is better than ordinary black paint with a heat emission index of 80%.
Despite the fact that CuO is cheaper than factory selective coatings, the process of its application is much more complicated than conventional painting. But first things first.
In general, the procedure for the formation of CuO on the collector absorber will take about three days.
To obtain CuO, it is necessary to oxidize copper itself - from it, in fact, the absorber is made. There can be no rollers and brushes here.
The main methods of preparation (more precisely, components) of a solution for copper oxidation are considered below.
Method one
Method two
Method three
Mandatory conditions for all oxidation methods
- All surfaces must be free of grease.
- During the reaction, oxygen will be released, which will quickly evaporate, so the solution must be fresh.
- It is advisable to use distilled water.
- All organics are quickly corroded by NaOH, so you should not take a solution with bare hands. On the contrary, one should use protective equipment(rubber gloves, glasses), because during the reaction, caustic sodium boils violently.
- The safest is K₂S₂O₈, but at the same time it is also the most expensive of the reagents.
- plasma spraying;
- electrochemically m.
- oxide of copper or any other metal;
- black chrome;
- it is black;
- it has a low rate of heat radiation (it all depends on the thickness of the layer, within 10-20%);
- 50 g sodium chlorite (NaClO₂).
- 100 g of caustic soda (NaOH).
- The temperature of the solution should be within 62-65ᵒС.
- NaСlО₂ is not so dangerous, but it is also better not to take it with your hands. Releases chlorine.
- (NH₄)₂S₂O₈ releases a lot of ammonia during the reaction, so the procedure cannot be carried out indoors. It is advisable to use a respirator.
- It would seem that a respirator is not needed in the open air, but in such conditions it is impossible to achieve the required temperature even in hot summer.
Safety
As a conclusion
In the end, I would like to give one more piece of advice. In order to wash away the result of an unsuccessful experiment, you need to use phosphoric acid (this, by the way, is one of the components of Coca-Cola). It effectively washes away copper oxide.
Video - Absorber with selective coating
In one of the previous articles, we considered solar collectors (or heliosystems, as they are also called), so we will not elaborate on the principle of their operation. We only note that such systems do not “rest” either in winter or even in cloudy weather - the water temperature never drops below 60ᵒС.
It would seem that there is nothing complicated in this, but this element of any solar system - selective coating - is still incomprehensible to many of us.
Selective coating is a layered structure of 3 or more layers of dielectrics (bismuth oxide, titanium oxide, aluminum nitride, etc. can be used)
This coverage is not only incomprehensible, it is essential element collector. The coating absorbs solar energy and turns it into thermal energy (the latter is accumulated and transported). This black "sponge" is called selective (eng. Select - choose, elect), because it emits several times less heat than it absorbs.
Note! The selective coating is transparent to infrared rays (it freely transmits and absorbs them), but is a kind of reflector for thermal radiation. In other words, it "locks" the heat inside the structure.
It is interesting that such a coating can be easily bought (it is sold in tin cans) and applied to any material except aluminium. A continuous layer of 1 m² of this substance costs about 1800 rubles. And if we add to this the cost of the battery, it becomes obvious that the solar system is not such an expensive pleasure as it is presented to ignorant buyers.
There is such a thing as the selectivity coefficient. In short, this is the ratio of the energy absorbed to the energy transferred back. In chemicals that are sold in finished form, this coefficient ranges between 8 and 16.5.
All selective compositions (and their this moment there are more than thirty) are applied by one of four existing methods:
Possibility of applying with a roller, spray gun or even a brush.
On the basis of the reagent, it is possible to produce an electrolyte, which is applied electrochemically. One bottle (costs about 3000 rubles) is enough for:
The coating absorbs all solar energy and turns it into heat (the latter is accumulated and transported)
Note! Although copper itself is an excellent heat absorber (much better than simple heat-resistant paint), the thin film that covers the absorber in solar systems is unstable and oxidizes quickly.
We will not expand on highly selective substances. You can resort to easy way- paint the panel with black paint, as shown in the video.
Methods for obtaining copper oxide
Everything is almost the same as in the first method, only instead of K₂S₂О₈ it is necessary to use persulphuric acid ammonium ((NH₄)₂S₂О₈).
Video - Solar system painted black
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Aqua-Flex Sun Reflect
Repels the heat of the sun's rays and transmits light rays.
Polyurethane transparent greenish paint on water based for painting external glasses and areas of structures exposed to the sun. Repels up to 85% of the heat of the sun's rays, thereby preventing heating, filters and transmits only light.
Protective paint for structures and structures sensitive to heat, repels the heat of the sun's rays, thereby preventing heating, one-component and very easy to use, used for coating exterior surfaces.
It is also produced on the basis of two-component polyurethane for greater stability in the external environment for many years.
Properties:
- repels most of the heat of sunlight, prevents heating of painted surfaces;
- prevents heating of structures where people and equipment are located;
- water-soluble, one-component, easy to use;
— economical, for coloring with a thin layer;
- allows you to significantly save energy for cooling and air conditioning.
Application:
- for painting exterior walls, windows, roofs of residential and industrial buildings;
- for painting exterior walls and roofs made of metal that heats up in the sun;
- for painting the outer surfaces of vehicle cabins in hot conditions and in strong sun;
- for painting the outer surfaces of containers and trailers with equipment;
- for painting the outer surfaces of closed military vehicles;
- for painting the outer surfaces of motorized parts of equipment and weapons.
Specifications:
— theoretical consumption - 1 liter per 8 m;
- elasticity - 1 mm (Sheen);
- density - 1.0 - 1.2 g / cm 3 ;
- viscosity - 1000-3000 Pa.s (Brookfield);
- hardness - 3 Dg (Erickson);
- abrasion - 120 microns - 850 cycles (Gardner) ASTM;
- heat recovery - 80-85% on average on the surface "polyflex white" (SRI ASTM E 1980 = Reflectance ASTM E 903: Surface Emimitance ASTM E 408);
- heat recovery - 90-100% on average on white TPO sheets or on a surface coated with aluminum.
Compound:
- high-quality polyurethane emulsion, stable in outdoor conditions;
— fillers, pigments;
- special substances for repelling heat;
- supplements.
Colors:
- translucent white.
Shine:
- silk.
Dry to Touch:
- 60 minutes.
Drying between coats:
— 2-8 hours, final - 24 hours.
Application method:
- brush, roller, spray;
Dilution:
— water;
- brush, roller - 10-20%;
- spraying - the first layer 30%, the second layer - 5%.
Surface preparation:
— clean the surface of dust, grease, dirt and old paint;
— Treat with sandpaper, remove dust with air under pressure.
Primer:
— new wall– sand the wall, remove dust and cover with a layer of Denbertex Primer;
– roof – a layer of Aqua-Flex White on resin or bituminous sheets;
— old paint– clean with sandpaper, remove dust and apply a layer of Denbertex Primer;
– old roof – clean with high pressure water, dry and apply Aqua-Flex White;
- corrugated roof and others - Tutgum Universal;
– steel containers with equipment, armored vehicles– Epoxy Primer Anti-Corrosion, if there is light rust – Epoxy Primer Rust Converter.
Supplied packaging:
— 5 l, 18 l, 200 l.
Storage conditions:
— in a dark place at room temperature.
Shelf life:
- 12 months in original packaging.
Cleaning tools:
- soap and water immediately after work.
Precautionary measures:
- do not eat;
- Keep out of the reach of children;
- apply paint in a well-ventilated area;
- wear protective goggles, clothing and gloves for work;
- in case of ingestion, immediately consult a doctor;
- in case of contact with skin and eyes, rinse with plenty of water and seek medical advice;
- Read the safety instructions on the packaging carefully.
Quality control:
— produced at the manufacturer's enterprise in accordance with the specification of the Institute of Standards;
— ISO 9001-2008.
Please pay attention:
Specifications are general information, whichdoes not commit to anything. The product is intended for professional use professionals with experience in the field.Specifications are not a substitute for advice, training and guidance.Before the main application should be tested on a small area. Specifications are subject to change and change, current versions are available upon request. You can get the names of professional consultants by phone. Please read the MSDS Safety Instructions carefully before using this product.
Ecology of consumption. Whether it's the roof of your car or the roofs of your houses, there are some things you don't want to heat up in the sun. They not only become unpleasant to the touch, but also prematurely lose their working qualities.
Whether it's the roof of your car or the roofs of your houses, there are some things you don't want to heat up in the sun. They not only become unpleasant to the touch, but also prematurely lose their working qualities.
While one solution to this problem is to paint surfaces white, a scientist at Johns Hopkins University has developed another way - glass-based reflective paint.
Dr. Jason Benkoski makes his paint from cheap and available material- potassium silicate, a raw glass ingredient that dissolves in water. He modifies it in such a way that the material can be sprayed onto the surface and dried, thereby making it waterproof. The scientist also adds pigment to give color and enhance the reflective properties.
The paint is almost entirely inorganic, which should make it much more durable than traditional organics. polymer paints which lose their qualities under the influence of sunlight. In addition, it does not emit as many volatile organic compounds that are harmful environment with which traditional paints are rich.
Also, instead of cracking, this paint has the ability to expand and contract with the metal surfaces it has been applied to.
The paint is mixed with a white pigment to reflect sunlight so it can be applied to any surface to maintain a constant temperature. This will not only help maintain the temperature of the building, but will also reduce the demand for air conditioners, and will also extend the life of any metal surface, as it reduces negative impact heat on metal structures.
The scientist says that despite the fact that the paint hardens, it continues to retain
While Benkoski designed his paint primarily for use on warships, he envisions it being used on things like playground equipment, grandstands, or roofs. Field trials are scheduled to begin within two years. published
As you know, the sun's rays have useful and even healing properties, but at the same time, they are able to deliver a lot of worries to private homeowners who have completed the roof of their cottage from metal sheets. The sun tends to hurt metal roof and strongly heat it, thereby increasing the cost of additional measures cooling and ventilation of rooms in the building. But thanks to American developers, the latest eco-friendly glass-based emulsion has appeared. Such paint will not only help reduce heat metal base by the reflective ability of the composition, but also give the surface durability.
Most modern emulsions intended for painting metal surfaces are produced on polymeric components, which include: acrylic, epoxy resins, polyurethane and latex. Under constant exposure to ultraviolet radiation, such paints crack and turn yellow. Also, polymeric coloring compositions tend to release organic compounds that are harmful to the environment. 
Silica-based glass, in terms of UV resistance, is considered perfect coverage, but excessive fragility excludes its use for painting roofs. Therefore, the main component of the paint was potassium silicate, which is a modification of silica, which interacts well with water. After drying the glass coloring solution, a durable water-repellent layer is formed.
Special pigments added to the potassium silicate endow the composition with the unique ability to reflect almost 100% of the sun's rays and emit heat inertly. Any type of base painted with this emulsion will heat up as much as the air temperature warms up, which is a fundamental factor in protecting a metal roof from the sun. 
Glass paint is designed to cool not only metal roofs, but also any surfaces made of metal, such as the hulls of sea liners or airbuses, car bodies and others.
Modern paints combine technologies, thanks to which neither moisture, nor destructive sunlight, nor small particles are afraid of emulsions. mechanical damage. The newly invented potassium silicate emulsion is an exceptional formulation with high technical specifications thanks to which metal surface retains its aesthetic and attractive original appearance.