What is Aerogel?

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  • What is Aerogel?

    Precio : Gratis

    Publicado por : suc6cess

    Publicado en : 18-10-21

    Ubicación : Albacete

    Visitas : 1

    Sitio web : http://www.keepinsulation.com/



    What is Aerogel?

    What is Aerogel?


    Aerogel is a broad term used to talk about an extraordinary group of

    materials that have been used since the 1960s in space travel, but are now finding uses across a whole range of industries.

    'Aerogel' is not a specific mineral or material with a set chemical formula-rather, the term is used to encompass all

    materials with a specific geometrical structure. This structure is an extremely porous, solid foam, with high connectivity

    between branched structures of a few nanometres across.


    Though aerogel is technically a foam, it can take many different shapes and forms. The majority of aerogel is composed of

    silica, but carbon, iron oxide, organic polymers, semiconductor nanostructures, gold and copper can also form aerogel.

    However, within the aerogel structure, very little is solid material, with up to 99.8% of the structure consisting of nothing

    but air. This unique composition gives aerogel an almost ghostly appearance; hence it is often referred to as 'frozen smoke'.


    Applications of Aerogel


    As aerogel has such diverse chemical and physical properties, it is no surprise that it also has a wide range of

    applications. Since the 1960's, aerogel has been used as the insulating material in spacesuits of NASA astronauts as, despite

    its wispy appearance, it is extremely strong and can survive take-off conditions easily.


    In the early 21st century, aerogel was employed in a very special role by NASA- to capture space dust. Aerogel is being used

    in conjunction with the 'Stardust' mission, which aims to bring back particles from space from beyond the Moon for the first

    time. This dust is being primarily collected from the comet 'Wild 2'. Aerogel is being used to capture this comet dust, as it

    will be able to trap the small particles without physically altering them. When the particle hits the aerogel, it will be

    traveling at speeds of up to 6 times that of a rifle bullet, which means most substances would not be able to slow the dust

    down without heating and thus alteration taking place. With aerogel, however, the dust buries itself into the porous material

    and is gradually brought to a stop as it loses momentum.


    ABOUT THE DIFFERENCE


    Silica Aerogel Insulation Blanket are the least dense solid

    in the world today. Pyrogel Aerogel insulation blanket have low thermal conductivity, high temperature resistance, flame

    retardancy, low density, and also have certain waterproof effect.


    Silica aerogel insulation blanket is the best thermal insulation blanket material so far, its pore size is lower than the

    atmospheric pressure under normal pressure, so the air molecules in aerogel gap are in a static state, thus avoiding the

    convection heat transfer of the air. The very low volume density of the Silica Aerogel Insulation and the bending path of the

    nanoscale structure also prevent the gas and solid heat conduction, and the "infinitely many" void walls can minimize the

    thermal radiation. Together, these three functions almost blocked all the ways of heat transfer, which is the adiabatic

    effect of aerogels to other materials.


    1st advantage is Excellent heat insulation effect


    The heat insulation effect of Silica Aerogel Insulation Felt is 2-5 times that of traditional insulation material, and the

    theoretical lifetime measured by Arrhenius experiment is 20 years. It's almost the same life as the building.


    2, reduce the thickness of insulation layer


    The aerogel felt has the same thermal insulation effect and

    the thickness is only a fraction of the traditional material. After heat preservation, the heat loss is small and the

    utilization rate of space is high. And at high temperatures, the above performance advantages are more obvious.


    3, hydrophobicity and fire resistance


    Aerogel blanket water repellent, which can effectively

    prevent moisture from entering pipes and equipment. At the same time, it has the fireproof performance of the building A1,

    and the three-dimensional network structure of the aerogel avoids the heat insulation effect of other thermal insulation

    materials in the long-term high temperature use, such as sinter deformation, settlement and so on.


    4. Convenient construction


    The aerogel blanket is light, easy to cut and sewn to adapt to various forms of pipes and equipment for thermal insulation,

    and the installation time and manpower are less.


    5, save transportation cost


    Aerogels can be used in an environment of -200~650 degrees Celsius, but it is usually used in aerogel insulation blanket.

    Based on the fiber's fire resistance temperature, in principle we will control the temperature of 200 degrees Celsius. The

    hot melt adhesive used for aluminum foil or cloth and insulation blanket will not melt and ensure normal use. Of course, we

    keep insulation on the exterior wall. Aerogel insulation will also be done when other fixed, plate, screw and so on will be

    used.


    There will be other conditions in the aerogel insulation blanket in practical applications, but the effectiveness will always

    come in and out of the ideal, but Gallic aerogel insulation blanket for all users, designed in all aspects, such as the

    hydrophilic and hydrophobicity of aerogel insulation blanket, can be done.


    Uses of Fiberglass Fabrics


    When it comes to composite construction or boat building, many people turn to fiberglass fabrics to get the job done right.

    Whether used for reinforcement, coating or laminating, professionals and DIY enthusiasts all over the world are quickly

    recognizing the benefits of this versatile composite. If you are new to composite materials or considering using fiberglass

    for a project, you came to the perfect place. In this guide, we will explore the properties and uses of fiberglass fabrics to

    help you better understand this convenient and cost-effective material.

    [[image1,left/right]]Fundamentals of Fiberglass Fabric
    With so many composites to choose from, understanding what each textile is and means for your project can be difficult or

    even daunting. Fortunately, the composite experts are here to help. Fiberglass cloth consists of bulk, chopped fibers or

    continuous strands of different kinds of glass. Whether in bulk form or a continuous strand, the combined physical strength

    of those glass fibers exceeds the properties that each of them has individually. This fiber-reinforced composite is typically

    flattened into sheets or randomly arranged and woven into fabrics for use in all sorts of applications.

    Fiberglass fabric is lightweight, strong, and less brittle than

    other composite materials. One of the most prized properties of fiberglass is its ability to be molded into various

    complicated shapes.

    Applications and Uses of Fiberglass Fabrics
    Across a wide range of industries, professionals look for materials with high-temperature insulation to ensure an effective

    thermal barrier for industrial gaskets. Because fiberglass offers high thermal insulation, it has become a prized and

    preferred material for protecting machinery. In our research, we discovered all sorts of ways this material is used!


    Production of NBR


    At first, we have the raw material. The raw material is yellow. After the manufacturing process, the material can be orange

    or red-tinted. At the end of the procedure, we have hot NBR Foam!


    The hot NBR rubber has radical generating activators & added catalyst to polymerization vessels.


    There is no major difference between the production of hot NBR & cold NBR. In fact, the cold NBR or hot

    NBR Foam is distinguishable with the number of branches.


    In the procedure of monomer recovery, the unwanted solids were removed by latex which is sent through numbers of filters

    where it stabilized with "antioxidant".


    You can understand the difference between NBR rubber & any other kind of foam-like EVA Foam immediately.


    In fact, when you get a piece of NBR foam from suppliers, you will find out the

    difference between the NBR foam & any other kind of foams like EVA foam , etc.


    After the production of PVC Nitrile, we have a very smooth & soft outer skin on both sides.


    This surface has a resilient touch and good flexibility. You can even use this resilient surface for some applications like

    yoga.


    The cells of the foam are clear on the surface sheets.


    The final product of NBR is a black piece of foam. You can also work with cutting & fabrication machinery like foam

    lamination (PSA) & Die-Cutting system.


    In the whole procedure of NBR production, you will be able to transform the NBR to different kinds of foam products like

    gaskets, mats, tapes & seals.


    The "Hong Kong Foam" company can produce customized products according to customer requirements.


    The NBR has opened cell structure & closed cell structure that the closed cell is more popular & more efficient for producing

    the different kind of foams.


    Mineral Wool Production


    To make mineral wool insulation, basalt and industrial slag are melted in a 3,000° F furnace. (Slag is a by-product of steel

    production that usually ends up in landfills.) Next, the super-heated liquid is exposed to a high-pressure stream of air and

    then spun into long fiber strands. The strands are compressed into thick, dense mats and then cut into batts of insulation.


    Now that you have a basic understanding of fiberglass and mineral wool

    , let's take a look at the differences between these two popular types of insulation.


    Fiberglass vs. Mineral Wool: How They Stack Up


    R-Value: The thermal resistance of insulation is measured by what's commonly known as the R-value, and the higher the R-

    value, the better. Fiberglass has an R-value of approximately 2.2 to 2.7 per inch of thickness. Mineral wool has a slightly

    higher R-value, ranging between 3.0 and 3.3 per inch.


    Size: Fiberglass insulation is available in a wider range of sizes and types than mineral wool. Mineral wool insulation is

    typically only available in unfaced batts.


    Sustainability: Mineral wool is composed of 70 percent or more recycled content. Fiberglass insulation typically contains 20

    to 30 percent recycled content.


    Cost: Fiberglass insulation costs 25 to 50 percent less than mineral wool. Fiberglass insulation for a 2×6 wall costs

    between 57 cents and 72 cents per square foot. Mineral wool insulation for the same wall runs about $1 to $1.10 per square

    foot.


    Density: Mineral wool insulation has superior sound-deadening properties. It has a density of 1.7 pounds per cubic foot, as

    compared to 0.5 to 1.0 for fiberglass. Because of its density, mineral wool is hard to compress. Fiberglass, on the other

    hand, will lose some of its insulating value if it's compressed too tightly.


    Weight: Fiberglass is lightweight and easy to carry, but the batts are rather limp and can be challenging to set into place.

    Mineral wool is heavier than fiberglass, but the batts are also stiffer, so they don't bend or flop over as easily.


    Water Resistance: Mineral wool insulation is hydrophobic, meaning it's highly resistant to moisture and water. Since it

    doesn't absorb moisture, mineral wool doesn't promote rot, corrosion, fungi, mold, mildew or bacterial growth. If fiberglass

    insulation gets wet, it becomes soggy, and its insulating value drops significantly.


    Loose-Fill: Loose-fill fiberglass insulation provides a quick, easy and economical way to insulate attic floors and wall

    cavities. Loose-fill mineral wool does exist, but it's difficult to find.


    Installation: Mineral wool comes in dense, firm batts that are friction-fit into place; no stapling required. Fiberglass

    batts must be secured with staples or wire. To cut fiberglass insulation, compress it flat with a board or metal

    straightedge, then slice it with a utility knife. Use a serrated bread knife or woodcutting handsaw to cut mineral wool

    insulation. It's recommended that you wear a dust mask when cutting and handling any type of insulation, including fiberglass

    and mineral wool.


    Fire Resistance: Mineral wool is extremely fire resistant and can be used as a firestop. Fiberglass insulation is

    noncombustible, but not nearly as fire resistant as mineral wool.


    Glass wool is a kind of fibrous material made from the melted glass raw

    materials or cullet. It consists of two types: loose wool and superfine wool. The fiber of the loose wool is 50 ~ 150 mm in

    length and 12 × 10- 3 mm in diameter. By contrast, the fiber of the superfine wool is much thinner in diameter, normally

    under 4 × 10- 3 mm. And it is also called superfine glass wool.


    The loose wool can be used to make glass wool blanket

    and glass wool board. The superfine glass wool can be used to make common superfine glass blanket, glass wool board, alkali

    free superfine glass blanket, hyperoxic silica superfine glass blanket, and it is also used to preserve heat in the

    exterior-protected construction and the pipelines.

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