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Multifunctional antioxidant
2018-1-8 15:50:54
Multifunctional antioxidant
Multi-functional antioxidant has been a major concern. The study of multifunctional antioxidant agents is designed to improve the effect of antioxidants, which can be used as an antioxygenation agent in the synthesis of various functional groups, such as the antioxygenation of phenolamine structure and excellent antioxidant properties. The anti-oxidant of phenol - thiophosphate and phenol dithiocarbamate combined with free radical scavenger and peroxide decomposer has obvious anti-oxidative effect.
Some organic molybdenum compounds also have anti-friction, anti-wear and anti-oxygen and other functions. Recently, researchers have focused on the introduction of anti-oxidative functional groups into heterocyclic compounds, which can obtain anti-oxidation, anti-corrosion, extreme pressure and anti-wear properties.
For engineering plastics processing, the antioxidant can prevent the thermal oxidation degradation of some polymers (such as ABS), so that the processing can be carried out smoothly. The amount of antioxidants is only 0.1-0.5.
The ideal antioxidant should have the following conditions: high antioxidant capacity; Good compatibility with resin, not precipitated out; The processing performance is good, in the processing temperature of high polymer is not volatile, not decomposed; Good solvent resistance, insoluble in water and oil; The color is best for colorless or light color, with no pollution products; Non-toxic or hypotoxic; Prices are low.
In fact, any kind of antioxidants can completely satisfy these conditions, therefore, the actual use, according to the types of engineering plastics, USES and processing method, using a variety of additives, cooperate to use, in order to produce synergistic effect.
The stability of a polymer with broken chain antioxygenation. The reaction mechanism of the antioxygenation intervention chain reaction is the mechanism of the chain reaction mechanism (CB - D) and the chain receptor mechanism (CB - A).
The typical cb-d mechanism is peroxidative free groups and inhibitors such as phenols, followed by the response of aromatic amines. The free radicals that are produced from the inhibitor AH are able to destroy a peroxide group PO2 in the same way as the reaction.
The stability of high polymer with preantioxidant. Prophylactic or antioxygenating agents can decompose hydrogen peroxides without forming free radical intermediates, so they can prevent hydroperoxides from decomposing into free radicals as a result of the branching of the chain.
The synergistic effect of antioxidants. A very famous example is the double cinnamon acyl glucosinolates double propionic acid ester (DLTDP) or double stearic acyl glucosinolates double propionic acid ester (DSTDP) with space steric phenol, in some polymer thermal stability. Another important example of synergistic effect is to improve the stability of the melt in the polyene class.
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 research direction of antioxidant has been turned to the development of high - efficiency and multi - energy auxiliary products and reactive antioxidant. Antioxidant BHT can inhibit or delay oxidative degradation of plastic or rubber to extend service life. Antioxidant BHT can prevent the acid value or viscosity of lubricating oil, fuel oil.
Phosphate-containing salts, including orthophosphate, pyrophosphate and bisphosphonates, are usually orthophosphates.
There are three kinds of positive phosphates: dihydrogen phosphate, which is also called a generation of phosphate, and is soluble in water. Hydrogen phosphate, also called diphosphate; Orthophosphate, also called three generations of phosphate. The latter two are not soluble in water except sodium, potassium and ammonium salt. M can be a metal other than a price of metal. Sodium dihydrogen phosphate is used to control the concentration of hydrogen ions in the solution. Disodium hydrogen phosphate is used for water treatment as the precipitant of polyvalent metal. Trisodium phosphate is used to make soap and detergent.
The structure of phosphate functional groups in acidic solution. In an alkaline solution, the functional group releases two hydrogen atoms and ionized phosphate with a formal charge of minus 2. The phosphate ion is a polyatomic ion that contains a phosphorus atom and is surrounded by four oxygen atoms to form a regular tetrahedron. The phosphate ions have a formal charge of -3 and a conjugate base of hydrogen phosphate ions; The hydrogen phosphate ion is the conjugate base of dihydrogen phosphate. And the dihydrogen phosphate is the conjugate base of the phosphate. It's a hypervalent molecule (phosphorus atoms have 10 electrons in their shell shell). Phosphate is also an organophosphorus compound whose chemical formula is OP(OR) 3.
In addition to some alkali metals, most phosphate, in standard conditions, is insoluble in water.
In dilute aqueous solutions, phosphates exist in four forms. In a strong base environment, phosphate ions will be more. In the environment of weak base, there are more hydrogen phosphate ions. In the environment of weak acid, dihydrogen phosphate is more common. In the case of strong acid, water soluble phosphoric acid is the main form.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Multi-functional antioxidant has been a major concern. The study of multifunctional antioxidant agents is designed to improve the effect of antioxidants, which can be used as an antioxygenation agent in the synthesis of various functional groups, such as the antioxygenation of phenolamine structure and excellent antioxidant properties. The anti-oxidant of phenol - thiophosphate and phenol dithiocarbamate combined with free radical scavenger and peroxide decomposer has obvious anti-oxidative effect.
Some organic molybdenum compounds also have anti-friction, anti-wear and anti-oxygen and other functions. Recently, researchers have focused on the introduction of anti-oxidative functional groups into heterocyclic compounds, which can obtain anti-oxidation, anti-corrosion, extreme pressure and anti-wear properties.
For engineering plastics processing, the antioxidant can prevent the thermal oxidation degradation of some polymers (such as ABS), so that the processing can be carried out smoothly. The amount of antioxidants is only 0.1-0.5.
The ideal antioxidant should have the following conditions: high antioxidant capacity; Good compatibility with resin, not precipitated out; The processing performance is good, in the processing temperature of high polymer is not volatile, not decomposed; Good solvent resistance, insoluble in water and oil; The color is best for colorless or light color, with no pollution products; Non-toxic or hypotoxic; Prices are low.
In fact, any kind of antioxidants can completely satisfy these conditions, therefore, the actual use, according to the types of engineering plastics, USES and processing method, using a variety of additives, cooperate to use, in order to produce synergistic effect.
The stability of a polymer with broken chain antioxygenation. The reaction mechanism of the antioxygenation intervention chain reaction is the mechanism of the chain reaction mechanism (CB - D) and the chain receptor mechanism (CB - A).
The typical cb-d mechanism is peroxidative free groups and inhibitors such as phenols, followed by the response of aromatic amines. The free radicals that are produced from the inhibitor AH are able to destroy a peroxide group PO2 in the same way as the reaction.
The stability of high polymer with preantioxidant. Prophylactic or antioxygenating agents can decompose hydrogen peroxides without forming free radical intermediates, so they can prevent hydroperoxides from decomposing into free radicals as a result of the branching of the chain.
The synergistic effect of antioxidants. A very famous example is the double cinnamon acyl glucosinolates double propionic acid ester (DLTDP) or double stearic acyl glucosinolates double propionic acid ester (DSTDP) with space steric phenol, in some polymer thermal stability. Another important example of synergistic effect is to improve the stability of the melt in the polyene class.
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 research direction of antioxidant has been turned to the development of high - efficiency and multi - energy auxiliary products and reactive antioxidant. Antioxidant BHT can inhibit or delay oxidative degradation of plastic or rubber to extend service life. Antioxidant BHT can prevent the acid value or viscosity of lubricating oil, fuel oil.
Phosphate-containing salts, including orthophosphate, pyrophosphate and bisphosphonates, are usually orthophosphates.
There are three kinds of positive phosphates: dihydrogen phosphate, which is also called a generation of phosphate, and is soluble in water. Hydrogen phosphate, also called diphosphate; Orthophosphate, also called three generations of phosphate. The latter two are not soluble in water except sodium, potassium and ammonium salt. M can be a metal other than a price of metal. Sodium dihydrogen phosphate is used to control the concentration of hydrogen ions in the solution. Disodium hydrogen phosphate is used for water treatment as the precipitant of polyvalent metal. Trisodium phosphate is used to make soap and detergent.
The structure of phosphate functional groups in acidic solution. In an alkaline solution, the functional group releases two hydrogen atoms and ionized phosphate with a formal charge of minus 2. The phosphate ion is a polyatomic ion that contains a phosphorus atom and is surrounded by four oxygen atoms to form a regular tetrahedron. The phosphate ions have a formal charge of -3 and a conjugate base of hydrogen phosphate ions; The hydrogen phosphate ion is the conjugate base of dihydrogen phosphate. And the dihydrogen phosphate is the conjugate base of the phosphate. It's a hypervalent molecule (phosphorus atoms have 10 electrons in their shell shell). Phosphate is also an organophosphorus compound whose chemical formula is OP(OR) 3.
In addition to some alkali metals, most phosphate, in standard conditions, is insoluble in water.
In dilute aqueous solutions, phosphates exist in four forms. In a strong base environment, phosphate ions will be more. In the environment of weak base, there are more hydrogen phosphate ions. In the environment of weak acid, dihydrogen phosphate is more common. In the case of strong acid, water soluble phosphoric acid is the main form.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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