A blowing agent is a substance which is capable of producing a cellular structure via a foaming process in a variety of materials that undergo hardening or phase transition, such as polymers, plastics, and metals. However, on cooling the blowing agent will condense, i.e. a reversible process.
What does a blowing agent do?
Blowing agents are additives used in the manufacture of foamed plastics, which have the advantage of lightness, contribute to material and cost savings, and are distinguished by the fact that they are thermally insulating. Blowing agents usually create fine and regular cellular structures during polymer processing.
How do foam blowing agents work?
A foaming agent is a material that facilitates the formation of foam such as a surfactant or a blowing agent. A surfactant, when present in small amounts, reduces surface tension of a liquid (reduces the work needed to create the foam) or increases its colloidal stability by inhibiting coalescence of bubbles.
What is blowing agent in chemistry?
Chemical Blowing Agents. The chemical blowing agents are chemical compounds added to manufacture sponge products. The additives are mixed with polymeric materials such as synthetic resins or rubbers to produce gas through thermal decomposition and produce foam structures.
What is the blowing agent for open cell foam?
The blowing agent used to install open-cell insulation is water, which reacts with air to become carbon dioxide. Because CO2 expands quickly, the bubbles tend to burst before the plastic sets — hence “open cell” — producing a spongy, lightweight foam.
Is water a blowing agent?
The oldest and most common blowing agent is water, which reacts with the isocyanates liberating carbon gas and forming polyurea rigid structures. The auxiliary blowing agents (ABAs) are low boiling point compounds, also used in foam formulation.
Is pentane a blowing agent?
Blowing agent Pentane is a hydrocarbon solvent coming directly from the natural gas and crude oil. Pentane as blowing agent in (PUR) insulation foam : N-Pentane (CAS : 78-78-4).
Which is used as foaming agent?
The most common foaming agents used in personal care are chemicals sodium laureth sulfate (SLES), sodium lauryl sulfate (sometimes referred to as sodium dodecyl sulfate or SLS) and coco-glucoside.
Do foam blowing agents deplete ozone layer?
Chemical refrigerants and foam blowing agents are harmful to the environment – they can cause ozone layer depletion and are powerful greenhouse gases. Hydrofluorocarbons (HFCs) have become a popular replacement for CFCs and HCFCs since they pose no harm to the ozone layer.
Are surfactants foaming agents?
Foaming agent is a surfactant which, when present in small amounts, facilitates the formation of a foam, or enhances its colloidal stability by inhibiting the coalescence of bubbles.
Why is pentane a good blowing agent?
Pentane-blown foams have another advantage: better dimensional stability due to the fact that pentane does not condense as much as HCFC-141b at temperatures normally experienced by the foam in use. The condensation of HCFC-141b causes the cells to shrink and expand on a cyclical basis, reducing dimensional stability.”.
Is ethanol a blowing agent?
Several CO 2 -based mixtures have also been used as blowing agent. For instance, Champagne et al. used ethanol and 1,1,1,2-tetrafluoroethane (HFC-134a) as a co-blowing agent for the foaming of PS  and PE , respectively.
What are examples of gas blown plastics?
Foam insulation – this includes polystyrene (Styrofoam), polyurethane, and polyisocyanurate (Polyiso) in both board and blown in varieties. In each of these cases, a plastic is “blown” with a gas to create a foam that has a large number of voids incorporating the gas, and hence a high insulation value.
How do you make a foaming agent?
A standard recipe is 2 parts of cement and fine, dry sand to 1 part water and foam generator. You will want to have a quality foam generator to get the best results.
Is polymer a foam?
Polymer foam is an important polymer material whose polymer matrix contains a large number of tiny foam holes inside and is also known as a porous polymer material. At present, polymer foam is one of the most widely used polymer materials and plays a very important role in the polymer industry [1,2,3,4,5,6,7,8].
What type of plastic is polyurethane?
Polyurethane is a polymer joined by urethane links. These links are formed by reacting a di- or poly-isocyanate with a polyol. Polyurethane is unique in that it is not manufactured like many other plastics. Most polymers, such as polyethylene, are produced in the form of a powder and then molded into a desired form.
What is insulation blowing gas?
Simply, it is a substance used during the manufacture of cellular foam insulation products. These agents are typically used to enhance the thermal performance of the finished product by filling the cells within the insulation with a low thermal conductivity gas.
What is a gas blown plastic?
foamed plastic …are produced by incorporating a blowing agent that decomposes at the fusion point of the plastic, releasing gas bubbles that are trapped during the gelling.
How foams are manufactured?
Foams are made by forming gas bubbles in a plastic mixture, with the use of a blowing agent. Foam manufacture is either a continuous process for making laminate or slabstock or a batch process for making various shapes by cutting or molding. There are two basic types of foam.
Can pentane be condensed?
The name pentane can be used for any of the three structural isomers that share the molecular formula C5H12 . In IUPAC nomenclature however the term pentane is used exclusively for n-pentane, the unbranched isomer of the group. The condensed structural formula will be CH2(CH2)3CH3 .
What does pentane smell like?
Pentane is a clear, colorless liquid with a mild gasoline-like odor. It is used in making other chemicals, plastics and low- temperature thermometers.
What does pentane mean in English?
pentane. / (ˈpɛnteɪn) / noun. an alkane hydrocarbon having three isomers, esp the isomer with a straight chain of carbon atoms (n -pentane) which is a colourless flammable liquid used as a solvent.
What is the foaming agent in toothpaste?
Many toothpastes contain sodium lauryl sulfate (SLS). This common ingredient creates the foam when you brush, but can also irritate sensitive teeth and gums.
What is concrete foaming agent?
Foaming Agent for Concrete is foam produced from the chemical reactions, which forms the cellular structure in the concrete. Foaming Agent for CLC Bricks is to be diluted in water and then foam is produced in a concrete foam generator with compressed air. Foam produced has very fine and stable high quality foam.
What is foaming agent in food?
Foaming agent also known as aerating agent. A foaming agent is additives that facilitates formation of foam and make it possible to form or maintain a uniform dispersion of a gaseous phase in liquid or solid food.