News Details
Polyethylene resin antioxidant
2018-1-4 23:52:52
Polyethylene resin antioxidant
Polyethylene (PE) is less sensitive to oxygen than PP, so the amount of polythene antioxidant can be relatively less. The general dosage of polyethylene resin antioxidant is between 0.01~0.1%. The processing temperature of polyethylene (PE) is at 180~280 C, such as blow molding of granular polyethylene (PE) resin. Only 264 or DLTP of 0.01~0.05% can be processed.
For the products with high stability requirements for communication and power cables, polyethylene resin antioxidant should choose low volatility and high molecular weight blocked phenol.
LDPE is mainly used for blown film. The processing temperature is about 200 degrees. When processing, it will be cross-linked by oxidized molecules, and then form gelatinous film in the film. It will become a visible aggregate. It is usually called "fish eye".
The antioxidants required for blow molding must be compatible. The antioxidant with good compatibility is still difficult to disperse one hundred percent. In order to prevent the film from being blown or sprayed, the additive can not be added to more than 0.1%.
Polyethylene is a thermoplastic resin obtained by polymerization of ethylene. In industry, the copolymers of ethylene and a small amount of alpha olefins are also included. Polyethylene is odorless, non-toxic, feel like wax, has excellent resistance to low temperature performance (minimum temperature can reach -70 ~ -100 C), good chemical stability, erosion resistance to most acid-base (not resistant to oxidizing acid), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation properties.
Polyethylene is sensitive to environmental stress (chemical and Mechanical), and is poor in heat-resistant aging. The properties of polyethylene vary depending on the molecular structure and density. The products of different density (0.91 ~ 0.96g/cm3) can be obtained by different production methods.
Polyethylene can be processed by the molding method of general thermoplastic (see plastic processing). It is widely used for manufacturing thin films, containers, pipes, monofilament, wire and cable, daily necessities, etc., and can be used as high-frequency insulation materials for TV and radar. With the development of petroleum and chemical industry, the production of polyethylene has been developed rapidly, and the output is about 1/4 of the total plastic production. In 1983, the world polyethylene production capacity was 24.65Mt, and the building capacity was 3.16Mt.
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.
Corrosion resistance, electrical insulation (especially high-frequency insulation) can be excellent, chlorination, irradiation modification, use of glass fiber reinforced polyethylene. The melting point, hardness and rigidity, high strength, low water absorption, good electrical properties and radiation resistance; soft, high pressure polyethylene elongation, impact strength and good permeability; ultra high molecular weight polyethylene high impact strength, fatigue resistance, wear resistance, suitable for the production of low pressure polyethylene corrosion resistant parts and parts of high pressure polyethylene insulation; suitable for making films; ultra high molecular weight polyethylene is suitable for production of shock, abrasion and transmission parts.
The English name is "High Density Polyethylene", referred to as "HDPE" for short. HDPE is a kind of high crystalline and nonpolar thermoplastic resin. The appearance of the original HDPE is milky.
HDPE is a thermoplastic polyolefin formed by copolymerization of ethylene. Although HDPE has been launched in 1956, the plastic has not yet reached its mature level. This versatile material is still developing its new uses and markets.
HDPE is a kind of high crystalline and nonpolar thermoplastic resin. The appearance of the original HDPE is milky, and a certain degree of translucent in the thin section. PE has the characteristics of excellent resistance to most of the living and industrial chemicals. Some kinds of chemicals can produce chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride).
The polymer is not hygroscopic and has good waterproof steam property. It can be used for packaging. HDPE has good electrical properties, especially high dielectric strength, so it is very suitable for wire and cable. The medium to high molecular weight class has excellent impact resistance, which is the same at normal temperature and even at low -40F temperature. The unique characteristics of various levels of HDPE are the proper combination of four basic variables: density, molecular weight, molecular weight distribution and additives. Different catalysts are used to produce customized polymers. These variables are combined to produce different uses of the HDPE grade; the best balance is achieved in performance.
This is the main variable that determines the HDPE characteristics, although the 4 variables mentioned are indeed interacting with each other. Ethylene is the main raw material of polyethylene. A small number of other comonomers, such as 1 butene, l hexene or 1 octene, are often used to improve the performance of polymers. The content of HDPE above a few monomers is generally not more than 1% - 2%. The crystallinity of the polymer was slightly reduced by the addition of the copolymerized monomer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Polyethylene (PE) is less sensitive to oxygen than PP, so the amount of polythene antioxidant can be relatively less. The general dosage of polyethylene resin antioxidant is between 0.01~0.1%. The processing temperature of polyethylene (PE) is at 180~280 C, such as blow molding of granular polyethylene (PE) resin. Only 264 or DLTP of 0.01~0.05% can be processed.
For the products with high stability requirements for communication and power cables, polyethylene resin antioxidant should choose low volatility and high molecular weight blocked phenol.
LDPE is mainly used for blown film. The processing temperature is about 200 degrees. When processing, it will be cross-linked by oxidized molecules, and then form gelatinous film in the film. It will become a visible aggregate. It is usually called "fish eye".
The antioxidants required for blow molding must be compatible. The antioxidant with good compatibility is still difficult to disperse one hundred percent. In order to prevent the film from being blown or sprayed, the additive can not be added to more than 0.1%.
Polyethylene is a thermoplastic resin obtained by polymerization of ethylene. In industry, the copolymers of ethylene and a small amount of alpha olefins are also included. Polyethylene is odorless, non-toxic, feel like wax, has excellent resistance to low temperature performance (minimum temperature can reach -70 ~ -100 C), good chemical stability, erosion resistance to most acid-base (not resistant to oxidizing acid), insoluble in common solvents at room temperature, low water absorption, excellent electrical insulation properties.
Polyethylene is sensitive to environmental stress (chemical and Mechanical), and is poor in heat-resistant aging. The properties of polyethylene vary depending on the molecular structure and density. The products of different density (0.91 ~ 0.96g/cm3) can be obtained by different production methods.
Polyethylene can be processed by the molding method of general thermoplastic (see plastic processing). It is widely used for manufacturing thin films, containers, pipes, monofilament, wire and cable, daily necessities, etc., and can be used as high-frequency insulation materials for TV and radar. With the development of petroleum and chemical industry, the production of polyethylene has been developed rapidly, and the output is about 1/4 of the total plastic production. In 1983, the world polyethylene production capacity was 24.65Mt, and the building capacity was 3.16Mt.
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.
Corrosion resistance, electrical insulation (especially high-frequency insulation) can be excellent, chlorination, irradiation modification, use of glass fiber reinforced polyethylene. The melting point, hardness and rigidity, high strength, low water absorption, good electrical properties and radiation resistance; soft, high pressure polyethylene elongation, impact strength and good permeability; ultra high molecular weight polyethylene high impact strength, fatigue resistance, wear resistance, suitable for the production of low pressure polyethylene corrosion resistant parts and parts of high pressure polyethylene insulation; suitable for making films; ultra high molecular weight polyethylene is suitable for production of shock, abrasion and transmission parts.
The English name is "High Density Polyethylene", referred to as "HDPE" for short. HDPE is a kind of high crystalline and nonpolar thermoplastic resin. The appearance of the original HDPE is milky.
HDPE is a thermoplastic polyolefin formed by copolymerization of ethylene. Although HDPE has been launched in 1956, the plastic has not yet reached its mature level. This versatile material is still developing its new uses and markets.
HDPE is a kind of high crystalline and nonpolar thermoplastic resin. The appearance of the original HDPE is milky, and a certain degree of translucent in the thin section. PE has the characteristics of excellent resistance to most of the living and industrial chemicals. Some kinds of chemicals can produce chemical corrosion, such as corrosive oxidizers (concentrated nitric acid), aromatic hydrocarbons (xylene) and halogenated hydrocarbons (carbon tetrachloride).
The polymer is not hygroscopic and has good waterproof steam property. It can be used for packaging. HDPE has good electrical properties, especially high dielectric strength, so it is very suitable for wire and cable. The medium to high molecular weight class has excellent impact resistance, which is the same at normal temperature and even at low -40F temperature. The unique characteristics of various levels of HDPE are the proper combination of four basic variables: density, molecular weight, molecular weight distribution and additives. Different catalysts are used to produce customized polymers. These variables are combined to produce different uses of the HDPE grade; the best balance is achieved in performance.
This is the main variable that determines the HDPE characteristics, although the 4 variables mentioned are indeed interacting with each other. Ethylene is the main raw material of polyethylene. A small number of other comonomers, such as 1 butene, l hexene or 1 octene, are often used to improve the performance of polymers. The content of HDPE above a few monomers is generally not more than 1% - 2%. The crystallinity of the polymer was slightly reduced by the addition of the copolymerized monomer.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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