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nature : to promote the bubble occurred, or in conjunction obturator formation pore structure of the material. The physical and chemical foam blowing agent can be surfactant, such as soap, detergent, natural substances such as proteins, plastic plants, volatile liquid such as ethanol, water and inert gases can occur if the material azo compounds, nitroso compounds, water insoluble gases such as air, nitrogen , carbon dioxide, hydrogen. For the foam, foam system, the foam rubber, sponge rubber, foam concrete, glass bubbles. Processing pesticide water dispersible granule, tablet also need foam. Frother mainly refers to the liquid blowing agent, sometimes also referred to with Mo agent for mineral flotation, as terpinen, phenols, alcohols, etc.. Plastics and rubber polymer foam formation pore structure of a foam material also known. Generally divided into physical and chemical foam blowing agent. Physical foam blowing agent known as volatile, usually soluble resin low boiling liquid or solid easy sublimation, the use of most species such as pentane, hexane, three Lambda methane, ethane three Lambda low boiling point aliphatic hydrocarbons or halohydrocarbon. Chemical foam blowing agent known as decomposition, the processing temperature can rapidly produce a large number of decomposition gases, according to comprise inorganic and organic foam blowing agent. Inorganic blowing agents, including sodium bicarbonate, ammonium carbonate, sodium nitrite, etc.. Organic foam involved azobenzene compound, nitroso compounds and sulfonyl hydrazine compounds and other major types.
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