News Details
Aromatic amine type antioxidant
2018-1-1 11:45:53
Aromatic amine type antioxidant also known as antioxidant, is the production of the largest number of a class, mainly used in rubber products.
Aromatic amine type antioxidants are low in price and significant in oxygen resistance, but their application in light and white products is limited due to discoloration of products.
The important aromatic amine type antioxidants are two anilines, two phenylene amine, two hydrogen quinoline and other compounds and their derivatives or polymers, which can be used in natural rubber, styrene butadiene rubber, neoprene and isoprene rubber and other products.
Rubber antioxidant is added in the production process of rubber chemicals can delay aging, prolong the service life of rubber rubber.
With the progress and development of the aging process, the performance of rubber and its products will gradually decrease so that the use value is completely lost. In order to extend the service life of rubber products, it is necessary to incorporate some substances that can inhibit the aging process in rubber, so as to extend the storage life and service life of rubber and its products. These substances called antioxidants.
The effect of different kinds of antioxidant. According to its main functions, it can be divided into thermal oxidation aging agent, ozone inhibitor, harmful metal ion inhibitor, anti fatigue agent, ultraviolet absorber, anti cracking agent and so on. However, because each kind of protection function is often not a kind of special antioxidant, antioxidant can most of several aging factors play a role, but to varying degrees.
The protective effect of every kind of antioxidants have limitations, and rubber products in the actual use of aging is the result of many factors, so the choice should pay attention to the following points:
(1) due to the characteristics of each kind of different antioxidant, and different formulation of the aging performance of different. Therefore, for a rubber material the most effective antioxidant, on another rubber material is ineffective or even harmful. So, the selection must be based on a variety of rubber antioxidant material aging, anti-aging and antioxidant characteristics of various requirements overall consideration, reasonable choice.
(2) as an antioxidant can not meet the requirements, should use two or more antioxidants and use, the coordination function, ensure that the anti aging effect.
(3) there are some antioxidant effects and coloring phenomenon of rubber pollution. In general, phenolic antioxidant protective effect is poor, but no pollution or little pollution. The protective effect of high amine antioxidant will make rubber, pollution, serious discoloration. These contradictions should be taken into account in the selection of these contradictions.
(4) the amount can not exceed the solubility of antioxidant in the rubber, to prevent frost spray, pollution rubber surface quality.
(5) amine antioxidants on rubber scorch have adverse effects; phenolic antioxidants can delay the vulcanization, should pay attention to in the selection.
Triphenyl phosphite (antioxidant, stabilizer TPPi)
Packing method: net weight of 200KG/galvanized iron bucket (a small cabinet to hold 16 tons), 1000KG/IB (a small container with 18 tons) or 23 tons of it.
Port of shipment: Shanghai port
Price quotation validity: 15 days
Warehouse time: within 15 days (customs clearance)
Export rights: our own right to import and export.
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.
Aromatic amine (English: Aromatic amine) is an amine with an aromatic substituent, that is, -NH2, -NH- or nitrogen-containing groups are connected to an aromatic hydrocarbon. The structure of aromatic hydrocarbon usually contains one or more benzene rings. Aniline is the simplest example of this kind of compound. Aromatic amines have high molecular reactivity. Aromatic amine is generally a high boiling liquid or a low melting point solid, with a special odor and a greater toxicity.
The structure of aniline in aromatic amines occupies the SP2 hybrid orbitals on the nitrogen and the overlap of the benzene ring electron paths, forming the conjugated pi molecular orbital of nitrogen and benzene ring.
Aromatic amines are alkaline in amines and are generally weak in alkalinity, and can react with acid - generated salts. Besides, aromatic amines also have some properties.
The aromatic amine with hydrogen on N is very easy to oxidize, and the oxidation products are different with the different kinds of oxidants and the reaction conditions.
Electrophilic substitution reaction on aromatic amine aromatic rings by oxidation of aromatic amines
In the electrophilic substitution reaction of aromatic amine, H2N-, RNH-, R2NH-, ArNH- are all ortho location groups, and the corresponding ammonium salt H3N+ is the interposition location group.
Halogenation reaction 1. halogenation: when aniline is directly halogenated, the reaction is difficult to stay in the one generation phase except in reaction with iodine to generate iodine and aniline.
The acylation reaction is 2. acylation. There is hydrogen on the nitrogen of the first and the two grade aromatic amines. The yield is low due to the acylation reaction between the nitrogen on the amino group and the carbon on the benzene ring, but the acylation reaction on the aromatic ring carbon can proceed smoothly if the amino group is protected by the acyl group.
3.: when sulfonation sulfonation sulfonation reaction with aniline sulfate salt first, if using fuming sulfuric acid as sulfonation reagent, reaction at room temperature, mainly to obtain substituted product with concentrated sulfuric acid sulfonation reaction is carried out in a long time under the heating condition, the main product is the product of n-p-substituted.
Nitration reaction 4. nitrification: when nitrifying directly, amino is easily oxidized by nitric acid, and the conversion rate is low. In order to prevent amino oxidation, amino groups are often protected by amine acetylation, and then the acetyl group is removed after reaction.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Aromatic amine type antioxidants are low in price and significant in oxygen resistance, but their application in light and white products is limited due to discoloration of products.
The important aromatic amine type antioxidants are two anilines, two phenylene amine, two hydrogen quinoline and other compounds and their derivatives or polymers, which can be used in natural rubber, styrene butadiene rubber, neoprene and isoprene rubber and other products.
Rubber antioxidant is added in the production process of rubber chemicals can delay aging, prolong the service life of rubber rubber.
With the progress and development of the aging process, the performance of rubber and its products will gradually decrease so that the use value is completely lost. In order to extend the service life of rubber products, it is necessary to incorporate some substances that can inhibit the aging process in rubber, so as to extend the storage life and service life of rubber and its products. These substances called antioxidants.
The effect of different kinds of antioxidant. According to its main functions, it can be divided into thermal oxidation aging agent, ozone inhibitor, harmful metal ion inhibitor, anti fatigue agent, ultraviolet absorber, anti cracking agent and so on. However, because each kind of protection function is often not a kind of special antioxidant, antioxidant can most of several aging factors play a role, but to varying degrees.
The protective effect of every kind of antioxidants have limitations, and rubber products in the actual use of aging is the result of many factors, so the choice should pay attention to the following points:
(1) due to the characteristics of each kind of different antioxidant, and different formulation of the aging performance of different. Therefore, for a rubber material the most effective antioxidant, on another rubber material is ineffective or even harmful. So, the selection must be based on a variety of rubber antioxidant material aging, anti-aging and antioxidant characteristics of various requirements overall consideration, reasonable choice.
(2) as an antioxidant can not meet the requirements, should use two or more antioxidants and use, the coordination function, ensure that the anti aging effect.
(3) there are some antioxidant effects and coloring phenomenon of rubber pollution. In general, phenolic antioxidant protective effect is poor, but no pollution or little pollution. The protective effect of high amine antioxidant will make rubber, pollution, serious discoloration. These contradictions should be taken into account in the selection of these contradictions.
(4) the amount can not exceed the solubility of antioxidant in the rubber, to prevent frost spray, pollution rubber surface quality.
(5) amine antioxidants on rubber scorch have adverse effects; phenolic antioxidants can delay the vulcanization, should pay attention to in the selection.
Triphenyl phosphite (antioxidant, stabilizer TPPi)
Packing method: net weight of 200KG/galvanized iron bucket (a small cabinet to hold 16 tons), 1000KG/IB (a small container with 18 tons) or 23 tons of it.
Port of shipment: Shanghai port
Price quotation validity: 15 days
Warehouse time: within 15 days (customs clearance)
Export rights: our own right to import and export.
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.
Aromatic amine (English: Aromatic amine) is an amine with an aromatic substituent, that is, -NH2, -NH- or nitrogen-containing groups are connected to an aromatic hydrocarbon. The structure of aromatic hydrocarbon usually contains one or more benzene rings. Aniline is the simplest example of this kind of compound. Aromatic amines have high molecular reactivity. Aromatic amine is generally a high boiling liquid or a low melting point solid, with a special odor and a greater toxicity.
The structure of aniline in aromatic amines occupies the SP2 hybrid orbitals on the nitrogen and the overlap of the benzene ring electron paths, forming the conjugated pi molecular orbital of nitrogen and benzene ring.
Aromatic amines are alkaline in amines and are generally weak in alkalinity, and can react with acid - generated salts. Besides, aromatic amines also have some properties.
The aromatic amine with hydrogen on N is very easy to oxidize, and the oxidation products are different with the different kinds of oxidants and the reaction conditions.
Electrophilic substitution reaction on aromatic amine aromatic rings by oxidation of aromatic amines
In the electrophilic substitution reaction of aromatic amine, H2N-, RNH-, R2NH-, ArNH- are all ortho location groups, and the corresponding ammonium salt H3N+ is the interposition location group.
Halogenation reaction 1. halogenation: when aniline is directly halogenated, the reaction is difficult to stay in the one generation phase except in reaction with iodine to generate iodine and aniline.
The acylation reaction is 2. acylation. There is hydrogen on the nitrogen of the first and the two grade aromatic amines. The yield is low due to the acylation reaction between the nitrogen on the amino group and the carbon on the benzene ring, but the acylation reaction on the aromatic ring carbon can proceed smoothly if the amino group is protected by the acyl group.
3.: when sulfonation sulfonation sulfonation reaction with aniline sulfate salt first, if using fuming sulfuric acid as sulfonation reagent, reaction at room temperature, mainly to obtain substituted product with concentrated sulfuric acid sulfonation reaction is carried out in a long time under the heating condition, the main product is the product of n-p-substituted.
Nitration reaction 4. nitrification: when nitrifying directly, amino is easily oxidized by nitric acid, and the conversion rate is low. In order to prevent amino oxidation, amino groups are often protected by amine acetylation, and then the acetyl group is removed after reaction.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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