News Details
Antioxidant
2017-12-28 15:37:44
Antioxidant is a kind of chemicals, and when its only a small amount of the polymer system to exist, can be slow or inhibit polymer oxidation process, so as to prevent the ageing of the polymer and extend its service life and antioxidant known as the "stabilizer".
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 should be found;
The compatibility of the resin is good, not precipitated out;
The processing performance is good, the processing temperature of high polymer is not volatilize, not decomposed;
Good extraction ability, insoluble in water and oil;
The color of the color is best for colorless or light color, with no pollution products;
Having no toxicity or low toxicity;
They are cheap.
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.
Broadly speaking, most weak reducers are antioxidants, which are only suitable for different industrial USES. High chemical, physical stability, or low-toxicity, weak reductants can be cleverly used in the formulation as an antioxidant. For example, citric acid is a weak reductive organic acid, which we can use in beverage formulation to play an antioxidant role; It is easy to oxidize the food and add a small amount of antioxidants to prolong their storage time. Plastics, synthetic fibers and rubber are susceptible to thermal oxygen degradation, and the addition of antioxidants can maintain the excellent properties of the polymer materials and prolong the life of the polymer.
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.
Cas no. : 101-02-0
HS: 29209019.00
The most important index of products: colorless, yellow liquid
Density (rho) 2525:1.183-1.192, refractive index (eta 020) : 1.585 1.590, freezing point ° C: 19-24, chloride (Cl - %) : 0.20 or less
Tax refund: the current tax refund of Triphenyl phosphite is 9 percent
Raw materials: phenol, phosphorus trichloride, phosphorus trichloride.
Thermal oxidation process of organic compounds is a series of free radical chain reaction, in under the action of heat, light or oxygen, organic molecules breaking of chemical bonds, generating active free radicals and hydrogen peroxide. The hydrogen peroxide decomposition reaction also produces the hydrocarbon free radical and hydroxyl radical. These free radicals can trigger a series of free radical chain reactions, resulting in fundamental changes in the structure and nature of organic compounds. The effect of antioxidants is to remove the newly produced free radicals, or to induce the decomposition of hydroperoxide to prevent chain reactions. The antioxidant that can eliminate free radical is aromatic amine and impeded phenol and other compounds and their derivatives, called the main antioxidant; The antioxygenation of hydrogen peroxide can be divided into organic compounds containing phosphorus and sulfur, called auxiliary antioxidant.
According to the mechanism of action, antioxidants can be divided into peroxides, such as zinc dithiocarbamate and zinc dialkyl dithiocarbamate. Free radical scavenging antioxygeners, such as n-phenyl alpha-naphthylamine and alkyphenothiazine, etc. Metal deactivation antioxygenation, such as benzotriazole derivatives and thiazole derivatives.
The action mechanism of antioxidant
1. Stability of polymer with broken chain antioxygenation agent
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.
2. 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.
3. Synergistic effect between antioxidant agents
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.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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 should be found;
The compatibility of the resin is good, not precipitated out;
The processing performance is good, the processing temperature of high polymer is not volatilize, not decomposed;
Good extraction ability, insoluble in water and oil;
The color of the color is best for colorless or light color, with no pollution products;
Having no toxicity or low toxicity;
They are cheap.
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.
Broadly speaking, most weak reducers are antioxidants, which are only suitable for different industrial USES. High chemical, physical stability, or low-toxicity, weak reductants can be cleverly used in the formulation as an antioxidant. For example, citric acid is a weak reductive organic acid, which we can use in beverage formulation to play an antioxidant role; It is easy to oxidize the food and add a small amount of antioxidants to prolong their storage time. Plastics, synthetic fibers and rubber are susceptible to thermal oxygen degradation, and the addition of antioxidants can maintain the excellent properties of the polymer materials and prolong the life of the polymer.
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.
Cas no. : 101-02-0
HS: 29209019.00
The most important index of products: colorless, yellow liquid
Density (rho) 2525:1.183-1.192, refractive index (eta 020) : 1.585 1.590, freezing point ° C: 19-24, chloride (Cl - %) : 0.20 or less
Tax refund: the current tax refund of Triphenyl phosphite is 9 percent
Raw materials: phenol, phosphorus trichloride, phosphorus trichloride.
Thermal oxidation process of organic compounds is a series of free radical chain reaction, in under the action of heat, light or oxygen, organic molecules breaking of chemical bonds, generating active free radicals and hydrogen peroxide. The hydrogen peroxide decomposition reaction also produces the hydrocarbon free radical and hydroxyl radical. These free radicals can trigger a series of free radical chain reactions, resulting in fundamental changes in the structure and nature of organic compounds. The effect of antioxidants is to remove the newly produced free radicals, or to induce the decomposition of hydroperoxide to prevent chain reactions. The antioxidant that can eliminate free radical is aromatic amine and impeded phenol and other compounds and their derivatives, called the main antioxidant; The antioxygenation of hydrogen peroxide can be divided into organic compounds containing phosphorus and sulfur, called auxiliary antioxidant.
According to the mechanism of action, antioxidants can be divided into peroxides, such as zinc dithiocarbamate and zinc dialkyl dithiocarbamate. Free radical scavenging antioxygeners, such as n-phenyl alpha-naphthylamine and alkyphenothiazine, etc. Metal deactivation antioxygenation, such as benzotriazole derivatives and thiazole derivatives.
The action mechanism of antioxidant
1. Stability of polymer with broken chain antioxygenation agent
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.
2. 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.
3. Synergistic effect between antioxidant agents
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.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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