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Tan powder. Easily soluble in water, chemically stable, non-flammable and non-toxic. Used as a cement additive, for physical foaming agents, foam pores are formed through changes in the physical form of a certain substance, that is, through the expansion of compressed gas, volatilization of liquids or dissolution of solids, then this substance is also known as physical foaming agent. Foaming agent. Commonly used physical blowing agents include low-boiling alkanes and fluorocarbons. 1. n-pentane 2. n-hexane 3. n-heptane 4. Petroleum ether (naphtha) 5. Trichlorofluoromethane (abbreviation. Dichlorodifluoromethane (abbreviation. Dichlorotetrafluoroethane) (abbreviation. Surfactant) The anionic surfactant aqueous solution produces a large amount of foam and introduces mechanical force into the air. It is widely used in the fields of gypsum board and foam concrete. The foaming agent has high surface activity, can effectively reduce the surface tension of the liquid, and has a double surface. The electron layer liquid film surrounds the air to form bubbles, and then a single bubble forms a foam. The essence of a foaming agent is its surface activity. Without surface activity, foaming cannot occur, so it cannot become a foaming agent. Surface activity is the foaming agent. The core of foam, commonly used surfactant foaming agents are: 1. Sodium lauryl sulfate (K122. Sodium fatty alcohol polyoxyethylene ether sulfate (AES3. Rosin soap foaming agent)). Foaming agent 4. Animals and plants Foaming agents such as protein foaming agent 5 and pulp waste liquid include the following azo compounds 1. Azodimethylamine (referred to as foaming agent AC), which is a yellow powder. Non-toxic, odorless, non-flammable, soluble in alkali, insoluble In gasoline, ethanol, benzene, pyridine and water.
2. Diisopropyl azodicarboxylate (referred to as foaming agent DIPA) is an orange oily liquid, soluble in almost all organic solvents and plasticizers, and insoluble in water. 3. Azobisisobutyronitrile (abbreviated as ABN or ABIN) is a colorless and odorless white crystalline powder, soluble in ether and vinyl chloride monomer, slightly soluble in methanol, and insoluble 4. Barium (II) azoformate nitrite Base compound 1, N, N'-dinitrosopentamethyltetramine foaming agent (DPT) is a light yellow crystalline fine powder, odorless, and has the smell of formaldehyde when wet. This product is flammable and must not be stored together with acidic substances. DPT is insoluble in ether, slightly soluble in water and ethanol, slightly soluble in chloroform, and easily soluble in acetone, methyl ethyl ketone, etc. 2. N,N'-dinitrosoterephthalamide (NTA for short) becomes a yellow-green odorless powder after treatment. Mix with 30% mineral oil. Trihydrazide foaming agent 1. Toluenesulfonyl hydrazide foaming agent (TSH) is a white crystalline powder, non-toxic, with a specific gravity of 1.42. Easily soluble in alkali, soluble in methanol, ethanol and butanone, slightly soluble in water and aldehydes, insoluble in benzene and toluene. This product gradually changes from melting to decomposition when heated to above 105℃, and releases nitrogen gas with a gas release amount of 120ml/g. There is no hygroscopicity at room temperature and its chemical properties are relatively stable. 2. Benzenesulfonyl hydrazide (BSH) 3. Benzene sulfonyl hydrazide (OBSH) (4) Inorganic foaming agent 1. Sodium bicarbonate Sodium bicarbonate is an inorganic foaming agent, white powder, specific gravity 2.16. The decomposition temperature is about 100-140°C, part of the CO2 is released, and all CO2 is lost at 270°C. Soluble in water but insoluble in alcohol.
5. Physical foaming agents The more commonly used physical foaming agents include low boiling point alkanes and fluorocarbons. 1. n-pentane 2. n-hexane 3. n-heptane 4. Petroleum ether (naphtha) 5. Trichlorofluoromethane (abbreviation: dichlorodifluoromethane (abbreviation: dichlorotetrafluoroethane) (abbreviation: this Product) uses animal protein in nature as the main raw material. It looks like a dark brown liquid with a pH value of 6.5~7.5. Its outstanding features are: the foam is particularly stable and is most suitable for the production of ultra-low density foam concrete, especially with a density of 200~ 500kg foam concrete./m3, because even when the foam content is extremely high, it is not easy to defoam and collapse, and the pouring stability is still very good. The foam concrete produced has high strength. It is a new type of environmentally friendly and efficient cement foaming agent that is currently widely used around the world. The approved foaming agent used is animal protein foaming agent, which has been widely used in industrially advanced countries such as Japan, the United States, Italy and other countries. Application scope: ground radiant insulation layer heating and roof insulation; filling wall blocks inside and outside buildings , sound insulation walls; construction of plant planting greenhouses, storage cold storage, etc. Foam concrete construction. Foaming agent characteristic indicators Project indicator requirements Physical and chemical indicators Appearance dark brown transparent liquid Ph value 70.5 Density (under 20 conditions) 1.150.05 Environmental protection indicators Volatile organic compounds , g/L50 Free formaldehyde, g/kg1 Benzene, g/kg0. 2 Toluene + xylene, g/kg10 Usage method and dosage Specific strength 28KG/CM2 Cement volume Water volume Additive Air volume Specific gravity KG/L Cement.9770. .8750..75730..7690..67670..64640..63590 ..62560..6510.93