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Polypropylene (PP) antioxidant
2018-1-6 12:17:43
Polypropylene (PP) antioxidant
Antioxidant is a kind of chemical substance which can delay the oxidation of the polymer and the aging phenomenon. Polypropylene under anaerobic conditions with good stability, but because there are a tertiary carbon atoms, polypropylene structure in the process of granulation processing, storage and use, the effect of heat, oxygen, light aging degradation, or even the loss of good comprehensive physical and mechanical properties and use value, which is poor than polyethylene polypropylene oxidation resistance and aging resistance.
In order to prevent and delay the oxidation degradation of polypropylene, themolecular weight of polypropylene unchanged, usually after polymerization reaction, separation, drying and storage before stabilizing treatment, must be conducted in the granulation phase joining of polypropylene (PP) antioxidant, is to increase the oxygen resistance of polypropylene is simple and effective way.
Polypropylene molecular chain contains tertiary carbon atoms which are easily decomposed by oxygen and must be protected against aging by using polypropylene (PP) antioxidants during processing, storage and application. In colouring polypropylene, certain colorants react with low molecular retardant phenolic antioxidants and weaken polypropylene (PP) antioxidants.
Polypropylene is a thermoplastic resin produced by polymerization of propylene. According to the position of methyl groups, there are three kinds of isotactic polypropylene, non-regulation polypropylene and polypropylene.
The same side of the methyl groups are arranged in the main chain of the molecule called isotactic polypropylene, if methyl chaotic are arranged at both sides of the main chain molecules called atactic polypropylene, when both sides of the methyl arranged alternately in the main chain of the molecule called syndiotactic polypropylene. In the polypropylene resin of general industrial production, the content of the isotactic structure is about 95%, and the rest is the non-regulation or the polypropylene. Industrial products are the main components of such commodities. Polypropylene also includes copolymer with propylene and a small amount of ethylene. Usually translucent and colorless solid, odorless and non-toxic. Because of its neat and high crystallization structure, so the melting point can be as high as 167 ℃. Heat resistance, corrosion resistance, the use of steam sterilization is its outstanding advantages. Small density, the lightest general purpose plastic. The disadvantage is that the low temperature resistance impact is poor and it is easy to age, but can be overcome by modification.
Copolymer of PP material with low thermal deformation temperature (100 ℃), low transparency and gloss, low rigidity, but have stronger impact strength, impact strength of PP increased with the increase of ethylene content increased. PP vicat softening temperature is 150 ℃. Due to the high degree of crystallinity, the surface stiffness and anti-scratch characteristics of this material are very good. There is no environmental stress cracking problem.
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.
The melt mass flow rate (MFR) of PP is usually 1~ 100. PP materials with low MFR have good anti-impact properties but low tensile strength. For the same MFR materials, the copolymerization type of anti-impact strength is higher than the homotype. Because of crystallization, the shrinkage rate of PP is quite high, generally 1.6~ 2.0%.
Polypropylene has high crystallinity and structure and thus has excellent mechanical properties. The absolute value of the mechanical properties of polypropylene is higher than that of polyethylene, but it is still a low quality in plastic materials, and its tensile strength can reach only 30 MPa or slightly higher. The high tensile strength of the larger polypropylene index is higher, but the impact strength of the material decreases with the increase of the other index, but it is no longer changed after falling to a certain value.
Temperature and loading rate have great influence on the toughness of polypropylene. When the temperature is higher than the glass temperature, the impact fracture is ductile fracture, which is lower than the vitrification temperature, and the impact strength value is greatly reduced. Increasing loading rate can increase the temperature of fracture transition to brittle fracture. Polypropylene has excellent anti-bending fatigue, and its products can bend 106 times without damage at normal temperature.
But at room temperature and low temperature, due to the high degree of molecular structure, the impact strength is poor. The most outstanding performance of polypropylene is anti - bending fatigue, commonly known as a hundred fold adhesive.
Polypropylene has good heat resistance, products can be in above 100 ℃ temperature disinfection sterilization, under the condition of not affected by external forces, 150 ℃ and deformation. Brittle temperature - 35 ℃, 35 ℃ below - will happen embrittlement, cold tolerance than polyethylene. Reported values for polypropylene glass transition temperature of a 18 qc, 0 qc, 5 ℃, it is also because people with different samples, containing crystalline and amorphous facies proportion is different, make the molecular chains in the amorphous part of different chain length. Than polyethylene polypropylene melt temperature around 40 a 50%, about 164 an 164 ℃, 100% degree of isotactic polypropylene melting point is 176 ℃.
Polypropylene has a good chemical stability, besides can be concentrated sulfuric acid, nitric acid erosion, for other kinds of chemical reagents are stable, but the low molecular weight fatty hydrocarbon, aromatic hydrocarbon and chlorinated hydrocarbon can make polypropylene softening and swelling, such as its chemical stability at the same time there is some increase with the increase of the crystallinity, chemical pipe and fittings for the production, so the polypropylene anti-corrosion effect is good.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Antioxidant is a kind of chemical substance which can delay the oxidation of the polymer and the aging phenomenon. Polypropylene under anaerobic conditions with good stability, but because there are a tertiary carbon atoms, polypropylene structure in the process of granulation processing, storage and use, the effect of heat, oxygen, light aging degradation, or even the loss of good comprehensive physical and mechanical properties and use value, which is poor than polyethylene polypropylene oxidation resistance and aging resistance.
In order to prevent and delay the oxidation degradation of polypropylene, themolecular weight of polypropylene unchanged, usually after polymerization reaction, separation, drying and storage before stabilizing treatment, must be conducted in the granulation phase joining of polypropylene (PP) antioxidant, is to increase the oxygen resistance of polypropylene is simple and effective way.
Polypropylene molecular chain contains tertiary carbon atoms which are easily decomposed by oxygen and must be protected against aging by using polypropylene (PP) antioxidants during processing, storage and application. In colouring polypropylene, certain colorants react with low molecular retardant phenolic antioxidants and weaken polypropylene (PP) antioxidants.
Polypropylene is a thermoplastic resin produced by polymerization of propylene. According to the position of methyl groups, there are three kinds of isotactic polypropylene, non-regulation polypropylene and polypropylene.
The same side of the methyl groups are arranged in the main chain of the molecule called isotactic polypropylene, if methyl chaotic are arranged at both sides of the main chain molecules called atactic polypropylene, when both sides of the methyl arranged alternately in the main chain of the molecule called syndiotactic polypropylene. In the polypropylene resin of general industrial production, the content of the isotactic structure is about 95%, and the rest is the non-regulation or the polypropylene. Industrial products are the main components of such commodities. Polypropylene also includes copolymer with propylene and a small amount of ethylene. Usually translucent and colorless solid, odorless and non-toxic. Because of its neat and high crystallization structure, so the melting point can be as high as 167 ℃. Heat resistance, corrosion resistance, the use of steam sterilization is its outstanding advantages. Small density, the lightest general purpose plastic. The disadvantage is that the low temperature resistance impact is poor and it is easy to age, but can be overcome by modification.
Copolymer of PP material with low thermal deformation temperature (100 ℃), low transparency and gloss, low rigidity, but have stronger impact strength, impact strength of PP increased with the increase of ethylene content increased. PP vicat softening temperature is 150 ℃. Due to the high degree of crystallinity, the surface stiffness and anti-scratch characteristics of this material are very good. There is no environmental stress cracking problem.
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.
The melt mass flow rate (MFR) of PP is usually 1~ 100. PP materials with low MFR have good anti-impact properties but low tensile strength. For the same MFR materials, the copolymerization type of anti-impact strength is higher than the homotype. Because of crystallization, the shrinkage rate of PP is quite high, generally 1.6~ 2.0%.
Polypropylene has high crystallinity and structure and thus has excellent mechanical properties. The absolute value of the mechanical properties of polypropylene is higher than that of polyethylene, but it is still a low quality in plastic materials, and its tensile strength can reach only 30 MPa or slightly higher. The high tensile strength of the larger polypropylene index is higher, but the impact strength of the material decreases with the increase of the other index, but it is no longer changed after falling to a certain value.
Temperature and loading rate have great influence on the toughness of polypropylene. When the temperature is higher than the glass temperature, the impact fracture is ductile fracture, which is lower than the vitrification temperature, and the impact strength value is greatly reduced. Increasing loading rate can increase the temperature of fracture transition to brittle fracture. Polypropylene has excellent anti-bending fatigue, and its products can bend 106 times without damage at normal temperature.
But at room temperature and low temperature, due to the high degree of molecular structure, the impact strength is poor. The most outstanding performance of polypropylene is anti - bending fatigue, commonly known as a hundred fold adhesive.
Polypropylene has good heat resistance, products can be in above 100 ℃ temperature disinfection sterilization, under the condition of not affected by external forces, 150 ℃ and deformation. Brittle temperature - 35 ℃, 35 ℃ below - will happen embrittlement, cold tolerance than polyethylene. Reported values for polypropylene glass transition temperature of a 18 qc, 0 qc, 5 ℃, it is also because people with different samples, containing crystalline and amorphous facies proportion is different, make the molecular chains in the amorphous part of different chain length. Than polyethylene polypropylene melt temperature around 40 a 50%, about 164 an 164 ℃, 100% degree of isotactic polypropylene melting point is 176 ℃.
Polypropylene has a good chemical stability, besides can be concentrated sulfuric acid, nitric acid erosion, for other kinds of chemical reagents are stable, but the low molecular weight fatty hydrocarbon, aromatic hydrocarbon and chlorinated hydrocarbon can make polypropylene softening and swelling, such as its chemical stability at the same time there is some increase with the increase of the crystallinity, chemical pipe and fittings for the production, so the polypropylene anti-corrosion effect is good.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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