News Details
Heterocyclic antioxidant
2017-12-29 10:58:01
Heterocyclic antioxidant as most metal deactivator, when a metal compound can change in lubricating oil (such as copper, iron, chromium and cobalt), heterocyclic antioxidants can catalyze hydrogen peroxide decomposition into free radicals, thereby accelerating oxidation process. The metal deactivator combined with metal ions to form a complex, and the complex has no catalytic activity to the hydroperoxide, and can slow down the oxidation rate.
Heterocyclic antioxidants, because of their close and stable chemical structure and high activity of nitrogen and sulfur, are easy to adsorb on the surface of metals.
Heterocyclic compounds and their derivatives are used as lubricating oil additives, which have excellent extreme pressure, antiwear and friction reducing properties, high thermal stability, good oxidation resistance and corrosion resistance. Therefore, heterocyclic compounds and their derivatives have broad application prospects. Sulfur nitrogen heterocyclic compounds, such as benzene and three alkyl substituted triazole, imidazole and 2- mercaptobenzothiazole, 2 5-, two -1 3 4-, thiol, thiophene and its derivatives of two are well-known lubricating oil rust and oxidation and corrosion inhibitor, some derivatives also have good antiwear properties.
Over the past 10 years, the domestic and foreign scholars have a lot of synthesis with a dense structure in the same molecule containing heterocyclic groups combined with active elements containing EP groups of heterocyclic derivatives and their tribological properties and oxidation and corrosion resistance were studied, some of the polar heterocyclic derivatives Yajian anti-wear and friction mechanism was researched, and obtained some results. Three benzo triazole and other nitrogenous heterocyclic compounds with anti rust, anti oxygen and anti corrosion, the nitrogenous compounds (such as amine) into heterocyclic compounds, can improve the performance of this kind of compounds, is a development trend of heterocyclic derivatives additives (through Mannich reaction to prepare).
And the other three of the benzene derivatives, such as N- and three were TERT alkylbenzene and benzo triazole and three alkyl vinyl ester or vinyl carboxylates (such as vinyl acetate) adduct, three triazole phosphate amine adduct or two organic thiophosphate and three triazole adducts have also been reported. These compounds can be used as corrosion inhibitors and metal deactivator.
Two triazole and its derivatives with thiophene and anti corrosion and abrasion resistance, which belongs to an ashless multifunctional additive in lubricating oil, some of the sulfur-containing extreme pressure agent and parathion type antioxidant and antiwear agent in using process can release active sulfur, causing sulfur corrosion of the metal surface, two of thiophene and its derivatives has the unique function of scavenging activity of sulfur, which was two sulfhydryl thiadiazole derivatives are widely used as lubricating oil antioxidant and metal deactivator.
For example, T561 metal deactivator is a thiazole azole polysulfide, it can inhibit the corrosion of metals, and has antioxidant and anti-wear properties. It is widely applied in oil products. Two In addition, thiazole or its derivatives are effective antiwear agents for lubricants. It can help low phosphorus engine oils meet the requirements of modern engine oils for low phosphating, and show good antioxidant properties through engine bench test, too. Two
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 is given priority to with metal stabilizer, cooperate with this product can reduce the harm of metal chlorides, maintain product transparency, and inhibition of color change, is also a good chemical intermediates, with phosphorus-containing flame retardant and use, can play a role of flame retardant antioxidant, and with stable performance, light can be used for synthesis alkyd resin and polyester, main raw materials for resin, this product can also be preparing pesticide intermediates trimethyl phosphite.
Thiothiazole and thiothiazole derivatives can also be used in lubricating grease to improve the antiwear properties. The polymer of thiazole two has excellent four ball resistance to sintering. It can be used as an antiwear extreme pressure agent for lubricating oils, and also has the functions of resisting oxygen and inhibiting copper corrosion. It overcomes the disadvantages of traditional extreme pressure agents, such as decreasing oxidation resistance and serious corrosion of copper.
Thiothiazole derivatives are grey and non phosphorous, and are environmentally friendly additives. In a sense, it is expected to replace the ZDDP series additives. Mercaptobenzothiazole compounds are the dense chemical structure of heterocyclic compounds, their derivatives can be used as lubrication oil extreme pressure antiwear agent, antioxidant and metal deactivator.
As of 2- mercaptobenzothiazole derivatives in the lubricant can also be in the thione form adsorbed on the metal surface, forming a layer of membrane complexes showed stronger corrosion inhibition of copper.
Oil soluble heterocyclic compounds is through rational molecular design and introduction of oil in its molecular structure of soluble groups, such as the introduction of alkyl compounds, mercapto compounds, ester compounds, containing boric acid ester, which can improve the oil solubility, can also obtain the benzothiazole derivatives with good anti oxygen corrosion and wear the antifriction property, typically containing two sulfoether group benzothiazole extreme pressure performance is better than that of the corresponding sulfide benzothiazole extreme pressure properties.
The chemical structure of these compounds and their wear resistance even reported, such as the two alkyl sulfide resistance with the alkyl chain length increases; antiwear properties of antiwear properties have more branched alkyl sulfide two is better than the corresponding alkyl sulfide is two.
The reaction of Mannich mercaptobenzothiazole and shielding phenol antioxidant, can generate oil soluble antioxidant and antiwear agent. Some other heterocyclic compounds, such as benzimidazole, phosphine derivatives and three azine derivatives, have good tribological properties. Most of them are in the laboratory research stage, and commercialized products are rarely reported.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Heterocyclic antioxidants, because of their close and stable chemical structure and high activity of nitrogen and sulfur, are easy to adsorb on the surface of metals.
Heterocyclic compounds and their derivatives are used as lubricating oil additives, which have excellent extreme pressure, antiwear and friction reducing properties, high thermal stability, good oxidation resistance and corrosion resistance. Therefore, heterocyclic compounds and their derivatives have broad application prospects. Sulfur nitrogen heterocyclic compounds, such as benzene and three alkyl substituted triazole, imidazole and 2- mercaptobenzothiazole, 2 5-, two -1 3 4-, thiol, thiophene and its derivatives of two are well-known lubricating oil rust and oxidation and corrosion inhibitor, some derivatives also have good antiwear properties.
Over the past 10 years, the domestic and foreign scholars have a lot of synthesis with a dense structure in the same molecule containing heterocyclic groups combined with active elements containing EP groups of heterocyclic derivatives and their tribological properties and oxidation and corrosion resistance were studied, some of the polar heterocyclic derivatives Yajian anti-wear and friction mechanism was researched, and obtained some results. Three benzo triazole and other nitrogenous heterocyclic compounds with anti rust, anti oxygen and anti corrosion, the nitrogenous compounds (such as amine) into heterocyclic compounds, can improve the performance of this kind of compounds, is a development trend of heterocyclic derivatives additives (through Mannich reaction to prepare).
And the other three of the benzene derivatives, such as N- and three were TERT alkylbenzene and benzo triazole and three alkyl vinyl ester or vinyl carboxylates (such as vinyl acetate) adduct, three triazole phosphate amine adduct or two organic thiophosphate and three triazole adducts have also been reported. These compounds can be used as corrosion inhibitors and metal deactivator.
Two triazole and its derivatives with thiophene and anti corrosion and abrasion resistance, which belongs to an ashless multifunctional additive in lubricating oil, some of the sulfur-containing extreme pressure agent and parathion type antioxidant and antiwear agent in using process can release active sulfur, causing sulfur corrosion of the metal surface, two of thiophene and its derivatives has the unique function of scavenging activity of sulfur, which was two sulfhydryl thiadiazole derivatives are widely used as lubricating oil antioxidant and metal deactivator.
For example, T561 metal deactivator is a thiazole azole polysulfide, it can inhibit the corrosion of metals, and has antioxidant and anti-wear properties. It is widely applied in oil products. Two In addition, thiazole or its derivatives are effective antiwear agents for lubricants. It can help low phosphorus engine oils meet the requirements of modern engine oils for low phosphating, and show good antioxidant properties through engine bench test, too. Two
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 is given priority to with metal stabilizer, cooperate with this product can reduce the harm of metal chlorides, maintain product transparency, and inhibition of color change, is also a good chemical intermediates, with phosphorus-containing flame retardant and use, can play a role of flame retardant antioxidant, and with stable performance, light can be used for synthesis alkyd resin and polyester, main raw materials for resin, this product can also be preparing pesticide intermediates trimethyl phosphite.
Thiothiazole and thiothiazole derivatives can also be used in lubricating grease to improve the antiwear properties. The polymer of thiazole two has excellent four ball resistance to sintering. It can be used as an antiwear extreme pressure agent for lubricating oils, and also has the functions of resisting oxygen and inhibiting copper corrosion. It overcomes the disadvantages of traditional extreme pressure agents, such as decreasing oxidation resistance and serious corrosion of copper.
Thiothiazole derivatives are grey and non phosphorous, and are environmentally friendly additives. In a sense, it is expected to replace the ZDDP series additives. Mercaptobenzothiazole compounds are the dense chemical structure of heterocyclic compounds, their derivatives can be used as lubrication oil extreme pressure antiwear agent, antioxidant and metal deactivator.
As of 2- mercaptobenzothiazole derivatives in the lubricant can also be in the thione form adsorbed on the metal surface, forming a layer of membrane complexes showed stronger corrosion inhibition of copper.
Oil soluble heterocyclic compounds is through rational molecular design and introduction of oil in its molecular structure of soluble groups, such as the introduction of alkyl compounds, mercapto compounds, ester compounds, containing boric acid ester, which can improve the oil solubility, can also obtain the benzothiazole derivatives with good anti oxygen corrosion and wear the antifriction property, typically containing two sulfoether group benzothiazole extreme pressure performance is better than that of the corresponding sulfide benzothiazole extreme pressure properties.
The chemical structure of these compounds and their wear resistance even reported, such as the two alkyl sulfide resistance with the alkyl chain length increases; antiwear properties of antiwear properties have more branched alkyl sulfide two is better than the corresponding alkyl sulfide is two.
The reaction of Mannich mercaptobenzothiazole and shielding phenol antioxidant, can generate oil soluble antioxidant and antiwear agent. Some other heterocyclic compounds, such as benzimidazole, phosphine derivatives and three azine derivatives, have good tribological properties. Most of them are in the laboratory research stage, and commercialized products are rarely reported.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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