News Details
Reactive antioxidants
2018-1-9 17:35:54
Reactive antioxidants
Antioxidants in addition to play a role of stabilization and consumption, in under the action of light, heat and other spoiled or react with chemicals, in the process of products using molecular migration and solvent extract and loss, thus reducing the efficiency of antioxidants. Therefore, people hope to be able to develop a kind of permanent stabilizer, namely reactive antioxidants, it can with monomer polymerization, will be hindered phenol groups grafted to the polymer chain, become a part of the polymer, synthetic polymer type antioxidants, so as to solve antioxidant volatile, extraction, migration and other defects.
Reactive antioxidants will be another trend in the development of antioxidants. At present, the existing reactive antioxidants have NDPA and DENA, and the molecule contains nitrosamine. There are also TAP, DAC, and DBA, which are a series of phenolic compounds containing allyl.
Reactive antioxidants is a kind of green environmental protection, plastic additives and adding antioxidants than reactive antioxidant both overcome the disadvantages of low molecular weight species easy migration losses, and avoid the high molecular weight products and resin disadvantages of poor compatibility and low effective concentration, is the ideal way to improve the effect of polymer stabilization. This study mainly focuses on the improvement of traditional technology, which is of guiding significance for the development of a new generation of high efficiency and cheap phenolic antioxidants.
First synthesis of 3, 50 - two tertiary butyl - 4 - hydroxy benzene methanol, then, consists of 3, 5-2 tertiary butyl. 4. The synthesis of benzyl alcohol and acrylic hydroxyl groups reactive antioxidants 3, 5-2 tertiary butyl - 4 - benzyl acrylic acid, solvent, the reaction time, reaction temperature, dosage of catalyst, material ratio and other factors on the reaction, the effect of the optimum synthetic process conditions were determined.
Finally, this kind of antioxidant added to PP, by measuring the oxidation induction period, melt flow rate, the comprehensive evaluation of the antioxidant for thermal oxidation condition, processing stability of PP resin, and the antioxidant Irganox antioxidant properties of 1010.
The best synthesis condition of 3, 5-ditert-butyl-4-hydroxybenzene methanol was: the reaction solvent was tert-butyl alcohol, and the dosage was 40ml; The catalyst was potassium tert-butyl alcohol, and the dosage was 2, 6-ditert-butyl phenol mass 3. Reaction time: 3h; Reaction temperature 20 ℃; The molar ratio of 2,6-2 tert-butyl phenol and formaldehyde is 1:2.5: the recrystallization solvent is n-hexane; The maximum yield rate of formaldehyde solution was 70.25. 3,5 - bt-4 - hydroxyphenyl methacrylate, the appropriate technological conditions were: The catalyst was concentrated sulfuric acid and the dosage was 0.02ml; Reaction time: 2h; Reaction temperature 80 ℃.
The molar ratio of acrylic acid to 3,5-2 tert-butyl -4- hydroxybenzene was 10:1. The anticoagulant is the diphenol with a dose of 0.03g; Recrystallization solvent for the petroleum ether, the high rate of 48.62 ﹪. Measured the oxidation induction period was 43.46 min of plastic, resin melt flow rate of 1.843 g / 10 min, it can be seen that antioxidants play a good antioxidant effect, but compared with those of antioxidant 1010 there is a certain gap.
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.
Phenolic antioxidants are used to prevent or inhibit chain reaction and chain growth by capturing oxygen free radicals, thereby terminating the free radical chain reaction. To prevent oxidation, there are hydroquinone, thiophenol, triphenol, etc.
The nitrite is a molecule of nitrite that is removed from the hydroxyl group, and the remaining valence atomic group is O=N -. The compounds that are linked to the hydrocarbons are called nitrite compounds (R - N=O).
In the nitrite HO - NO molecule, the nitrite compound r - NO is formed when the nitrogen atoms of nitro group are connected with the carbon atoms of hydrocarbons. For example, nitrobenzene c6H5NO.
Allyl is a chemical substance, and when a hydrogen atom is removed from the methyl (CH3 -) carbon atom of the propylene molecule, the remaining monovalent group is defined as: H2C=CH - CH2 -. CH= CH3 -CH3 - CH2-CH=CH2 - CH2- CH2- CH2- CH2- CH2.
Both of these are common nomenclature. If you remove a hydrogen from the intermediate carbon atom in the propylene molecule, the common nomenclature is called iso-1 propylene; If you use a methyl group instead of isobutylene or 2-methyl-1-propylene. Regardless of the name must contain a double bond selected the longest carbon chain as the main chain, when number must begin from carbon atoms with free price, so can't call < 2 - allyl >, double bond position is still in the no. 1, instead of no. 2, is only the position of the substituents in no. 2.
The allyl group is the electron group, and the propylene group is the electron-absorbing group. Because allyl group is the electron group, its activity is relatively high, the reagent activity of allyl group is relatively high.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Antioxidants in addition to play a role of stabilization and consumption, in under the action of light, heat and other spoiled or react with chemicals, in the process of products using molecular migration and solvent extract and loss, thus reducing the efficiency of antioxidants. Therefore, people hope to be able to develop a kind of permanent stabilizer, namely reactive antioxidants, it can with monomer polymerization, will be hindered phenol groups grafted to the polymer chain, become a part of the polymer, synthetic polymer type antioxidants, so as to solve antioxidant volatile, extraction, migration and other defects.
Reactive antioxidants will be another trend in the development of antioxidants. At present, the existing reactive antioxidants have NDPA and DENA, and the molecule contains nitrosamine. There are also TAP, DAC, and DBA, which are a series of phenolic compounds containing allyl.
Reactive antioxidants is a kind of green environmental protection, plastic additives and adding antioxidants than reactive antioxidant both overcome the disadvantages of low molecular weight species easy migration losses, and avoid the high molecular weight products and resin disadvantages of poor compatibility and low effective concentration, is the ideal way to improve the effect of polymer stabilization. This study mainly focuses on the improvement of traditional technology, which is of guiding significance for the development of a new generation of high efficiency and cheap phenolic antioxidants.
First synthesis of 3, 50 - two tertiary butyl - 4 - hydroxy benzene methanol, then, consists of 3, 5-2 tertiary butyl. 4. The synthesis of benzyl alcohol and acrylic hydroxyl groups reactive antioxidants 3, 5-2 tertiary butyl - 4 - benzyl acrylic acid, solvent, the reaction time, reaction temperature, dosage of catalyst, material ratio and other factors on the reaction, the effect of the optimum synthetic process conditions were determined.
Finally, this kind of antioxidant added to PP, by measuring the oxidation induction period, melt flow rate, the comprehensive evaluation of the antioxidant for thermal oxidation condition, processing stability of PP resin, and the antioxidant Irganox antioxidant properties of 1010.
The best synthesis condition of 3, 5-ditert-butyl-4-hydroxybenzene methanol was: the reaction solvent was tert-butyl alcohol, and the dosage was 40ml; The catalyst was potassium tert-butyl alcohol, and the dosage was 2, 6-ditert-butyl phenol mass 3. Reaction time: 3h; Reaction temperature 20 ℃; The molar ratio of 2,6-2 tert-butyl phenol and formaldehyde is 1:2.5: the recrystallization solvent is n-hexane; The maximum yield rate of formaldehyde solution was 70.25. 3,5 - bt-4 - hydroxyphenyl methacrylate, the appropriate technological conditions were: The catalyst was concentrated sulfuric acid and the dosage was 0.02ml; Reaction time: 2h; Reaction temperature 80 ℃.
The molar ratio of acrylic acid to 3,5-2 tert-butyl -4- hydroxybenzene was 10:1. The anticoagulant is the diphenol with a dose of 0.03g; Recrystallization solvent for the petroleum ether, the high rate of 48.62 ﹪. Measured the oxidation induction period was 43.46 min of plastic, resin melt flow rate of 1.843 g / 10 min, it can be seen that antioxidants play a good antioxidant effect, but compared with those of antioxidant 1010 there is a certain gap.
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.
Phenolic antioxidants are used to prevent or inhibit chain reaction and chain growth by capturing oxygen free radicals, thereby terminating the free radical chain reaction. To prevent oxidation, there are hydroquinone, thiophenol, triphenol, etc.
The nitrite is a molecule of nitrite that is removed from the hydroxyl group, and the remaining valence atomic group is O=N -. The compounds that are linked to the hydrocarbons are called nitrite compounds (R - N=O).
In the nitrite HO - NO molecule, the nitrite compound r - NO is formed when the nitrogen atoms of nitro group are connected with the carbon atoms of hydrocarbons. For example, nitrobenzene c6H5NO.
Allyl is a chemical substance, and when a hydrogen atom is removed from the methyl (CH3 -) carbon atom of the propylene molecule, the remaining monovalent group is defined as: H2C=CH - CH2 -. CH= CH3 -CH3 - CH2-CH=CH2 - CH2- CH2- CH2- CH2- CH2.
Both of these are common nomenclature. If you remove a hydrogen from the intermediate carbon atom in the propylene molecule, the common nomenclature is called iso-1 propylene; If you use a methyl group instead of isobutylene or 2-methyl-1-propylene. Regardless of the name must contain a double bond selected the longest carbon chain as the main chain, when number must begin from carbon atoms with free price, so can't call < 2 - allyl >, double bond position is still in the no. 1, instead of no. 2, is only the position of the substituents in no. 2.
The allyl group is the electron group, and the propylene group is the electron-absorbing group. Because allyl group is the electron group, its activity is relatively high, the reagent activity of allyl group is relatively high.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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