News Details
Phenolic antioxidants
2017-12-29 10:58:06
Phenolic antioxidants are the first antioxidants used in lubricating oil. Phenolic antioxidants have good synergistic effect with ZDDP compound, because phenolic compounds are free radical scavengers, ZDDP is peroxide decomposing agent, phenolic compounds can extend ZDDP oxidation induction period, and thus improve the oxidation resistance of lubricating oils.
Phenolic antioxidants, many of which have good thermal stability, are phenolic antioxidants, such as hindered phenol with different alkyl groups, hindered phenolic esters containing sulfur ether structure, polycyclic hindered phenol and alkylthiol hindered phenol.
Such as phenols, ashless antioxidant [3- (3, 5- Di tert butyl -4- hydroxyphenyl) isooctyl acrylate] is a good oil solubility, ashless anti high temperature with excellent oxidation resistance, it not only has better oxidation resistance, but also has excellent ability to control sludge formation, has good compatibility and compatibility with other additives in lubricating oil.
The hindered phenolic antioxidants Containing Thioether structure have good antioxidant effect in API II and class III base oils. For example, antioxidants containing sulfuric ether and monphenol can effectively solve the high temperature oxidation resistance of high-grade oil products, and make high-grade oil products have high thermal decomposition temperature through related engine bench test.
Thiobisphenol antioxidant (such as 2246-SbasfIrganoxL115) is a versatile and nonpoluted antioxidant, sulfur atom and phenols, synergistic effect, which has antioxidant properties and excellent solubility, its antioxidant effect is better than the ordinary single phenol structure antioxidant, showed good antioxidant properties in hydrogenated oil, and can inhibit the oxidation of nitro. The antioxidant effect of different phenolic antioxidants in base oil was investigated by SH/T0193 (0.25%).
Phenol, hydroxyl (-OH) is an organic compound formed directly from aromatic nuclei (benzene or thick phenyl rings).
Hydroxyl molecules are directly linked to the aromatic hydrocarbons (benzene ring or fused benzene ring) SP2 hybrid carbon atoms. This structure is similar to aliphatic alcohols. Therefore, tautomerism is also called tautomerism, which is called phenol structure interconversion. However, the structure of phenol is more stable, because it can satisfy the structure of one direction ring, so the main existence form of phenol in the isomeric equilibrium.
There are many phenolic compounds, such as phenol, cresol, aminophenol, nitrophenol, naphthol, Chlorophenol and so on, but phenol and cresol are most prominent.
Referred to as phenol phenol, also known as carbolic acid, acidic (corrosive), can be volatile at room temperature, the release of a special kind of irritating odor in the air, pink. The commonly used "water" disinfectant hospital is the dilute solution of phenol sodium salt.
Cresol also called similar chemical activity and cresol, phenol toxicity, also often exist at the same time.
Phenols differ according to their hydroxyl number directly linked to their aromatic rings. They can be divided into single and polyphenols. According to their volatility, phenols can be divided into volatile phenols and non-volatile phenols. Polyphenols have more volatility (than the boiling point of 230 degrees C). The most simple phenol is phenol, this is a kind of special odor colorless solid, was first found in coal tar, so it is also known as carbolic acid (for its acid).
Triphenyl phosphite (TPPi antioxidants, stabilizer) is the main raw materials of phenol, phosphorus oxychloride, phosphorus trichloride, phosphorus oxychloride, phosphorus trichloride belong to highly toxic chemicals, state control chemicals. Through raw material phenol, triclosan phosphorous and trichloride phosphorus, the direct method of trichloro phosphorus is used to direct (also known as thermal) and the indirect method of trichloride phosphorus (also known as cold method).
According to the relevant state regulations, tppi is currently exported to 9 kinds of dangerous goods.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
When placed in air, many phenolic compounds are pink and dark brown with some oxidation products. Phenol and hydrogen molecules can also generate hydrogen bonds between molecules and water molecules. Therefore, their boiling point and solubility in water are higher than those with aromatics. The solubility of phenol in cold water is less, but it can dissolve with hot water, and it is also easy to dissolve with organic solvents such as alcohol and ether. The main representative is:
1, phenol (C6H5OH) name carbolic acid, not only from coal tar oil, but also by the hydrolysis of chlorobenzene or cumene oxidation preparation method; the important raw material of organic synthesis, used for the manufacture of plastics, pharmaceuticals, pesticides, dyes, etc.;
2. The colorless crystal of hydroquinone is easily oxidized to quinone, which can be used as a developer, antioxidant and inhibitor.
3, naphthol has two isomers of alpha and beta. Alpha naphthol and beta naphthol produce purple and green precipitates with ferric trichloride, respectively, and can be obtained from the corresponding sodium naphthalene sulfonic acid sodium by alkali melting. Also in acidic conditions, obtained by the hydrolysis of naphthylamine.
Most phenols are colorless needle like crystals or white crystals, and a few alkyl phenols are high boiling point liquids. They have special odors, turn red with air and light, and change faster with alkali.
Although the C-O bond and O-H bond can break two kinds of reaction, the C-O bond is very strong and is not easy to break because of the p- pi conjugation effect. However, the O-H bond is easily fractured because the negative charge in the formed phenolic anion can be dispersed from the domain to be stable. The benzene ring on the phenol is more susceptible to the electrophilic substitution reaction than benzene because of the above conjugation.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Phenolic antioxidants, many of which have good thermal stability, are phenolic antioxidants, such as hindered phenol with different alkyl groups, hindered phenolic esters containing sulfur ether structure, polycyclic hindered phenol and alkylthiol hindered phenol.
Such as phenols, ashless antioxidant [3- (3, 5- Di tert butyl -4- hydroxyphenyl) isooctyl acrylate] is a good oil solubility, ashless anti high temperature with excellent oxidation resistance, it not only has better oxidation resistance, but also has excellent ability to control sludge formation, has good compatibility and compatibility with other additives in lubricating oil.
The hindered phenolic antioxidants Containing Thioether structure have good antioxidant effect in API II and class III base oils. For example, antioxidants containing sulfuric ether and monphenol can effectively solve the high temperature oxidation resistance of high-grade oil products, and make high-grade oil products have high thermal decomposition temperature through related engine bench test.
Thiobisphenol antioxidant (such as 2246-SbasfIrganoxL115) is a versatile and nonpoluted antioxidant, sulfur atom and phenols, synergistic effect, which has antioxidant properties and excellent solubility, its antioxidant effect is better than the ordinary single phenol structure antioxidant, showed good antioxidant properties in hydrogenated oil, and can inhibit the oxidation of nitro. The antioxidant effect of different phenolic antioxidants in base oil was investigated by SH/T0193 (0.25%).
Phenol, hydroxyl (-OH) is an organic compound formed directly from aromatic nuclei (benzene or thick phenyl rings).
Hydroxyl molecules are directly linked to the aromatic hydrocarbons (benzene ring or fused benzene ring) SP2 hybrid carbon atoms. This structure is similar to aliphatic alcohols. Therefore, tautomerism is also called tautomerism, which is called phenol structure interconversion. However, the structure of phenol is more stable, because it can satisfy the structure of one direction ring, so the main existence form of phenol in the isomeric equilibrium.
There are many phenolic compounds, such as phenol, cresol, aminophenol, nitrophenol, naphthol, Chlorophenol and so on, but phenol and cresol are most prominent.
Referred to as phenol phenol, also known as carbolic acid, acidic (corrosive), can be volatile at room temperature, the release of a special kind of irritating odor in the air, pink. The commonly used "water" disinfectant hospital is the dilute solution of phenol sodium salt.
Cresol also called similar chemical activity and cresol, phenol toxicity, also often exist at the same time.
Phenols differ according to their hydroxyl number directly linked to their aromatic rings. They can be divided into single and polyphenols. According to their volatility, phenols can be divided into volatile phenols and non-volatile phenols. Polyphenols have more volatility (than the boiling point of 230 degrees C). The most simple phenol is phenol, this is a kind of special odor colorless solid, was first found in coal tar, so it is also known as carbolic acid (for its acid).
Triphenyl phosphite (TPPi antioxidants, stabilizer) is the main raw materials of phenol, phosphorus oxychloride, phosphorus trichloride, phosphorus oxychloride, phosphorus trichloride belong to highly toxic chemicals, state control chemicals. Through raw material phenol, triclosan phosphorous and trichloride phosphorus, the direct method of trichloro phosphorus is used to direct (also known as thermal) and the indirect method of trichloride phosphorus (also known as cold method).
According to the relevant state regulations, tppi is currently exported to 9 kinds of dangerous goods.
Triphenyl phosphite (TPPi antioxidants, stabilizer) is mainly used in PVC, polyethylene, polypropylene, polystyrene, polyester, abs resin, epoxy resin, synthetic rubber antioxidant stabilizer, used in polyvinyl chloride (PVC) products as a chelating agent.
When placed in air, many phenolic compounds are pink and dark brown with some oxidation products. Phenol and hydrogen molecules can also generate hydrogen bonds between molecules and water molecules. Therefore, their boiling point and solubility in water are higher than those with aromatics. The solubility of phenol in cold water is less, but it can dissolve with hot water, and it is also easy to dissolve with organic solvents such as alcohol and ether. The main representative is:
1, phenol (C6H5OH) name carbolic acid, not only from coal tar oil, but also by the hydrolysis of chlorobenzene or cumene oxidation preparation method; the important raw material of organic synthesis, used for the manufacture of plastics, pharmaceuticals, pesticides, dyes, etc.;
2. The colorless crystal of hydroquinone is easily oxidized to quinone, which can be used as a developer, antioxidant and inhibitor.
3, naphthol has two isomers of alpha and beta. Alpha naphthol and beta naphthol produce purple and green precipitates with ferric trichloride, respectively, and can be obtained from the corresponding sodium naphthalene sulfonic acid sodium by alkali melting. Also in acidic conditions, obtained by the hydrolysis of naphthylamine.
Most phenols are colorless needle like crystals or white crystals, and a few alkyl phenols are high boiling point liquids. They have special odors, turn red with air and light, and change faster with alkali.
Although the C-O bond and O-H bond can break two kinds of reaction, the C-O bond is very strong and is not easy to break because of the p- pi conjugation effect. However, the O-H bond is easily fractured because the negative charge in the formed phenolic anion can be dispersed from the domain to be stable. The benzene ring on the phenol is more susceptible to the electrophilic substitution reaction than benzene because of the above conjugation.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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