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Choose industrial products. The foam pores of cement foaming agents are formed by changes in the physical form of a certain substance, that is, through the expansion of compressed gas, the volatilization of liquids, or the dissolution of solids. This substance is called a physical cement foaming agent. Commonly used cement foaming agents include low-boiling alkanes and fluorocarbons. 1. n-pentane 2. n-hexane 3. n-heptane oil ether (naphtha) 5. Trichlorofluoromethane (abbreviation) 6. Dichlorodifluoromethane (abbreviation) Monochlorotetrafluoroethane (abbreviation) Surface The active agent anionic surfactant aqueous solution generates a large amount of foam when mechanical force is introduced into the air, and is widely used in the fields of gypsum board and foam concrete. Cement foaming agents all have high surface activity and can effectively reduce the surface tension of the liquid. A double electron layer is arranged on the surface of the liquid film to surround the air, forming bubbles, and then single bubbles form foam. The essence of cement foaming agent is its surface active effect. Without surface activity, it cannot foam and cannot become a cement foaming agent. Surface activity is the core of foaming. Commonly used surfactant cement foaming agents are: 1. Sodium lauryl sulfate (K12) 2. Fatty alcohol polyoxyethylene ether sodium sulfate (AES) 3. Rosin soap cement foaming agent 4. Animal and plant protein cement foaming agent Foaming agent 5, pulp waste liquid and other cement foaming agents have the following types: (1) Azo compounds 1. Azodimethylamine (referred to as cement foaming agent AC) is a yellow powder, non-toxic, odorless, non-flammable, Soluble in alkali, insoluble in gasoline, alcohol, benzene, pyridine and water.
Diisopropyl azodicarboxylate (referred to as cement foaming agent DIPA) is an orange oily liquid, soluble in almost all organic solvents and plasticizers, and insoluble in water. 3． Azobisisobutyronitrile (abbreviation) is a colorless and odorless white crystalline powder, soluble in ether and vinyl chloride monomer, slightly soluble in methanol, and insoluble in water. 4. Barium (II) azocarboxylate nitroso compound 1. N,N'-dinitrosopentamethyltetramine (cement foaming agent DPT) is a light yellow crystalline fine powder, odorless, and odorless when wet. Formaldehyde smell. 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. (3) Hydrazide cement foaming agent 1. Toluenesulfonyl hydrazide (referred to as cement 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 for short) 3. Yes, diphenylsulfonyl hydrazide (OBSH for short) Further reading: Cement foaming agent