News Details
Amine type antioxidant
2017-12-29 10:58:03
Amine type antioxidant
Usually the phenolic antioxidant using temperature range is relatively low, for internal combustion engine oil, hydraulic oil and transformer oil; and the use of temperature than phenolic amine type antioxidants, especially the high temperature oxidation resistance of two aniline type alkyl amine type antioxidants, antioxidant for synthetic ester oil, as the main antioxidant jet turbine engine lubricating oil components.
There are two main antioxidant amine benzene amine antioxidants, antioxidant, two aniline phenyl alpha naphthylamine antioxidant and phenothiazine antioxidants. A series of derivatives of benzene, two amine, such as 3, 5- two, ethyl toluene, two amine, the mass fraction is less than 1%, the oxidation test results show that it can reduce the increase of oil viscosity and reduce the weightlessness of the bearing. N- two for PAO or benzylamine benzene amine polyol ester, antioxidant effect, and more suitable for metal salt or metal deactivator used together, metal corrosion, viscosity increase is very small, rarely forming sludge.
N ', N- two phenyl to benzyl two amine, its phenyl can also be substituted by methyl, ethyl or methoxy, and also an effective antioxidant. N, N- bis (2, 4- two amino two phenyl ether) imines and N, N- double (2, 4- two imido two phenyl ether) imines can all reduce the corrosion of metals, and the viscosity and acid value of oils increase little.
Aramine antioxidant mainly consists of two alkyl two anilines, two amino toluene derivatives, 1, 8- two amino naphthalene derivatives and so on. The two alkyl two aniline is widely used, and the alkyl or dialkylated two aniline can be used. The mass fraction of nitrogen in alkylated two aniline is generally 2% to 6%, and the low nitrogen content will weaken the effect of alkylated two aniline. The high nitrogen content will have an adverse effect on the compatibility and volatility of alkylated two aniline in lubricating oil.
The two - aniline antioxidant is suitable for the lubricating oil which is very fast in temperature rise, which can prevent the formation of the sludge in the synthetic ester oil. Two - aniline antioxidant is an important type of ash - free antioxidant. With the upgrading of the oil specifications, the high temperature antioxidant capacity of engine oil is put forward higher requirements, and the dosage of amine antioxidants in engine oil has been increased. It is reported that the combination of alkyl two aniline and molybdenum compounds can improve the oxidation and Tribological Properties of lubricating oil, and is especially suitable for crankcase lubricant or transmission oil, including phosphorus free multistage lubricating oil.
American patent reports that lubricating oil containing two aniline derivatives has continuously improved antioxidant capacity, and styrene based two aniline compounds have excellent anti-oxidation and corrosion resistance, and anti coking effect is good. In the ester oil, the antioxidation property of two aniline oligomer at high temperature is better than that of two aniline.
In addition, there are many reports that alkylated two aniline, carbamate and molybdenum salt are used in lubricating oil, which can be tested by the related bench test. Domestic researchers believe that molybdate and aromatic amine compounds can produce some complexes with better oxygen resistance, which makes the stability of aromatic amine antioxidants stronger.
Triphenyl phosphite (antioxidant, stabilizer TPPi) production process
1. Phosphorus oxychloride as the direct method (also called thermal method) phenol with pyridine and anhydrous benzene as solvent, in no more than 10 ℃ temperature, slowly add oxygen phosphorus chloride, then under reflux temperature, the reaction of 3 ~ 4 h. After cooling to room temperature, the reactants are washed by water to recycle pyridine. After centrifugal dehydration, the reagents are dehydrated with dried sodium sulfate, which is filtered to remove sodium sulfate. The first atmospheric distillation recovery of benzene, vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fraction, by cooling, crystallization, crushing is the finished product.
2. After phenol melting, stirring under add phosphorus trichloride under 25 ℃, Triphenyl phosphite is generated; Then heat up to 70 ℃ ventilation with chlorine gas, generated two chlorinated triphenyl phosphate; Again at 50 ℃ water hydrolysis, triphenyl phosphate. The hydrolysate with 5% soda solution for neutralization, water washing, the evaporation and vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fractions, cooling, crystallization, crushing, packaging is the finished product.
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.
The result of this effect reduces the reaction ability of Aramine and increases its oxidation induction period. With the implementation of GF-5 specification for car engine oil, the limitation of sulfur and phosphorus content in engine oil will be more stringent, and higher requirements for anti-oxidation, anti-wear and friction reduction of oil products will be required.
Against this background, the synergistic effect of non sulfur phosphorus molybdate and borate ester additives on Antiwear and friction reducing and their synergistic antioxidation with amine antioxidants will undoubtedly become a highlight in the research of additives for engine oils. The high temperature oxidation effect of N- phenyl naphthylamine compounds, phenyl naphthylamine two aniline has better antioxidant effect, but easy to precipitate.
The phenolic antioxidant, phenyl naphthylamine and two aniline together, not only the induction period increased significantly, but also reduce a lot of residue, so phenyl alpha naphthylamine and other additive.
In aviation lubricating oil, N- phenyl alpha naphthylamine is an essential component of a composite antioxidant and two antioxidant, aniline compound use, showed excellent antioxidant properties, such as MIL-L-7808J in the U.S. aviation lubricating oil containing l% on the two, two '- isooctyl benzene amine and 1.2% N- phenyl naphthylamine, MIL-L-23699 aviation lubricating oil containing 0.6% N- phenyl naphthylamine and 1.1% to two, on the two' - isooctyl aniline. An Yanjie's research shows that phenyl naphthylamine is a compatibility strong antioxidant, phenyl naphthylamine and ZDDP composite has excellent oxidation resistance.
Phenothiazine, also known as sulfurized two aniline, belongs to two aniline antioxidant. Its antioxidant effect is better than that of two aniline, because it has both free radical scavengers and peroxide decomposition agents.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Usually the phenolic antioxidant using temperature range is relatively low, for internal combustion engine oil, hydraulic oil and transformer oil; and the use of temperature than phenolic amine type antioxidants, especially the high temperature oxidation resistance of two aniline type alkyl amine type antioxidants, antioxidant for synthetic ester oil, as the main antioxidant jet turbine engine lubricating oil components.
There are two main antioxidant amine benzene amine antioxidants, antioxidant, two aniline phenyl alpha naphthylamine antioxidant and phenothiazine antioxidants. A series of derivatives of benzene, two amine, such as 3, 5- two, ethyl toluene, two amine, the mass fraction is less than 1%, the oxidation test results show that it can reduce the increase of oil viscosity and reduce the weightlessness of the bearing. N- two for PAO or benzylamine benzene amine polyol ester, antioxidant effect, and more suitable for metal salt or metal deactivator used together, metal corrosion, viscosity increase is very small, rarely forming sludge.
N ', N- two phenyl to benzyl two amine, its phenyl can also be substituted by methyl, ethyl or methoxy, and also an effective antioxidant. N, N- bis (2, 4- two amino two phenyl ether) imines and N, N- double (2, 4- two imido two phenyl ether) imines can all reduce the corrosion of metals, and the viscosity and acid value of oils increase little.
Aramine antioxidant mainly consists of two alkyl two anilines, two amino toluene derivatives, 1, 8- two amino naphthalene derivatives and so on. The two alkyl two aniline is widely used, and the alkyl or dialkylated two aniline can be used. The mass fraction of nitrogen in alkylated two aniline is generally 2% to 6%, and the low nitrogen content will weaken the effect of alkylated two aniline. The high nitrogen content will have an adverse effect on the compatibility and volatility of alkylated two aniline in lubricating oil.
The two - aniline antioxidant is suitable for the lubricating oil which is very fast in temperature rise, which can prevent the formation of the sludge in the synthetic ester oil. Two - aniline antioxidant is an important type of ash - free antioxidant. With the upgrading of the oil specifications, the high temperature antioxidant capacity of engine oil is put forward higher requirements, and the dosage of amine antioxidants in engine oil has been increased. It is reported that the combination of alkyl two aniline and molybdenum compounds can improve the oxidation and Tribological Properties of lubricating oil, and is especially suitable for crankcase lubricant or transmission oil, including phosphorus free multistage lubricating oil.
American patent reports that lubricating oil containing two aniline derivatives has continuously improved antioxidant capacity, and styrene based two aniline compounds have excellent anti-oxidation and corrosion resistance, and anti coking effect is good. In the ester oil, the antioxidation property of two aniline oligomer at high temperature is better than that of two aniline.
In addition, there are many reports that alkylated two aniline, carbamate and molybdenum salt are used in lubricating oil, which can be tested by the related bench test. Domestic researchers believe that molybdate and aromatic amine compounds can produce some complexes with better oxygen resistance, which makes the stability of aromatic amine antioxidants stronger.
Triphenyl phosphite (antioxidant, stabilizer TPPi) production process
1. Phosphorus oxychloride as the direct method (also called thermal method) phenol with pyridine and anhydrous benzene as solvent, in no more than 10 ℃ temperature, slowly add oxygen phosphorus chloride, then under reflux temperature, the reaction of 3 ~ 4 h. After cooling to room temperature, the reactants are washed by water to recycle pyridine. After centrifugal dehydration, the reagents are dehydrated with dried sodium sulfate, which is filtered to remove sodium sulfate. The first atmospheric distillation recovery of benzene, vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fraction, by cooling, crystallization, crushing is the finished product.
2. After phenol melting, stirring under add phosphorus trichloride under 25 ℃, Triphenyl phosphite is generated; Then heat up to 70 ℃ ventilation with chlorine gas, generated two chlorinated triphenyl phosphate; Again at 50 ℃ water hydrolysis, triphenyl phosphate. The hydrolysate with 5% soda solution for neutralization, water washing, the evaporation and vacuum distillation, collected 243 ~ 245 ℃ (1.47 kPa) fractions, cooling, crystallization, crushing, packaging is the finished product.
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.
The result of this effect reduces the reaction ability of Aramine and increases its oxidation induction period. With the implementation of GF-5 specification for car engine oil, the limitation of sulfur and phosphorus content in engine oil will be more stringent, and higher requirements for anti-oxidation, anti-wear and friction reduction of oil products will be required.
Against this background, the synergistic effect of non sulfur phosphorus molybdate and borate ester additives on Antiwear and friction reducing and their synergistic antioxidation with amine antioxidants will undoubtedly become a highlight in the research of additives for engine oils. The high temperature oxidation effect of N- phenyl naphthylamine compounds, phenyl naphthylamine two aniline has better antioxidant effect, but easy to precipitate.
The phenolic antioxidant, phenyl naphthylamine and two aniline together, not only the induction period increased significantly, but also reduce a lot of residue, so phenyl alpha naphthylamine and other additive.
In aviation lubricating oil, N- phenyl alpha naphthylamine is an essential component of a composite antioxidant and two antioxidant, aniline compound use, showed excellent antioxidant properties, such as MIL-L-7808J in the U.S. aviation lubricating oil containing l% on the two, two '- isooctyl benzene amine and 1.2% N- phenyl naphthylamine, MIL-L-23699 aviation lubricating oil containing 0.6% N- phenyl naphthylamine and 1.1% to two, on the two' - isooctyl aniline. An Yanjie's research shows that phenyl naphthylamine is a compatibility strong antioxidant, phenyl naphthylamine and ZDDP composite has excellent oxidation resistance.
Phenothiazine, also known as sulfurized two aniline, belongs to two aniline antioxidant. Its antioxidant effect is better than that of two aniline, because it has both free radical scavengers and peroxide decomposition agents.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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