News Details
Antioxidants are used in plastic products
2018-1-14 22:56:02
Antioxidants are used in plastic products
When plastic products are processed, it is possible to change the melting viscosity of resin and the torque of screw stem with the addition of antioxidants to the plastic products. If there is a large difference between the melting point and the resin melting range of the plastic products, there will be an anti-oxidant bias or the phenomenon of holding the screw.
Plastic products with below the melting point of antioxidant processing temperature above 100 ℃, should first will cause a certain concentration of masterbatch, antioxidant and then mixed with resin processing products, in order to avoid the bias current of antioxidants in products distribution and processing production.
Polyethylene terephthalate PET and polybutylene terephthalate PBT have good photostabilizer properties. After long-term use, the aging degree of the inner or deep of the product is still very low, but the surface of the product is yellow and brittle. PBT is used as an energy-saving lamp shade, and its surface color will gradually turn yellow depending on the time of use or the duration of the lamp.
Resin: PBT1080; Antioxidant: blocked phenol, phosphatate, organic tin thermal stabilizer compound, added 0.5%; Light stabilizer: uv absorber and hindered amine compound, add 2%. Spline and special spline in the blank with four energy-saving lamps (16 w) per homemade aging box, turn on the light irradiation for 60 days in a row, yellow index every 10 days, 60 days to measure tensile strength and impact strength.
The initial yellow light index of blank sample and special materials is about 1.2. The yellow light index is over 3 (yellowish) in 20 days, and the yellow light index is over 6 (yellow) at 50 days. During the 60 days, the yellow light index of special materials was basically unchanged.
Blank sample and special material sample irradiation before and after 60 days in the tensile strength, impact strength data can be seen that the strength of the blank sample by continuous irradiation after 60 days decline is larger, and the tensile strength of the special material samples only fell by 1%, the impact strength by 1.5%.
In the earlier literature, the design of PVC formula is mainly the design of thermal stabilizer, which is true for the production of soft PVC products. The hardness of the product can be achieved by adjusting the amount of DOP, and the external antioxidants are very few. Only a small amount of stearic acid or paraffin can be added. If you use solid metal soap, you can even remove the antioxidant.
And the selection of heat stabilizer variety and use quantity is relatively complex. It depends on whether the product is transparent or even highly transparent, whether it is resistant to sun exposure, toxic and heat and shear strength to choose different types of thermal stabilizer and its proportion and total amount of added.
However, for the design of rigid polyvinyl chloride formula, the author thinks that the difficulty and main content of the formulation design are the proportion of the internal and external antioxidants and the design of adding the total amount.
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.
The amount of antioxidants added cannot be reduced, but the proportion of internal and external antioxidants is even more important. Although the total amount is sufficient, the proportion is disordered, and the qualified products cannot be produced continuously. Current general formula design of PVC workers are mostly in the performance characteristics of various thermal stabilizer and its mechanism are more familiar with, the theory and the law is relatively mature, general reference is also relatively detailed introduction, after careful study, according to the performance requirements, the number of the varieties of heat stabilizer and design generally do not have what problem.
Other auxiliaries, such as processing auxiliaries, anti-impact modifiers, fillers, added varieties and quantity product manuals and reference books are clearly stated. Complicated, such as: smoke suppression flame retardant system, weather resistance, antistatic system system, formulation of the conductive system, even in the reference books are relatively mature theory and laws for formula workers reference.
However, there is no theoretical theory for the anti-oxygen system which is crucial to the processing of rigid PVC. There is no law that can effectively guide the formulation experiment. The only so-called law is to draw on the law of "similar solubility" in ordinary chemistry. Is "the polarity of the antioxidant and the more similar the polarity of the PVC resin, its compatibility, the better, so its antioxidant effect is better, on the other hand, have strong antioxidant effects" but the law to guide the formula design also is very limited.
Because the judgment of the polarity of the antioxidant is according to the chemical structure of antioxidants, antioxidant molecules containing hydroxyl, ester base, carboxyl, amide group and ether base, ketone group polarity can close group of species, quantity and the proportion of long chain alkyl. As antioxidant complex chemical structure, diversity, and close to adjacent group's influence each other, to fight the polarity of the size of the judgment is more difficult, this creates: the polarity of the antioxidants alone to infer antioxidant effect of antioxidants, and antioxidants actually difference between the antioxidant role, far beyond people's imagination.
Glycerol 3-12 - hydroxy stearic acid ester (i.e., hydrogenated castor oil) than three stearic acid glycerol ester (hardener) only three hydroxyl, but less plasticizing time 7 minutes, plasticizing time is reduced by 37%, the soybean oil only more than three stearic acid glycerol ester three double bond, plasticizing time reduced 7.3 minutes more, namely to reduce 38% of plasticizing time.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
When plastic products are processed, it is possible to change the melting viscosity of resin and the torque of screw stem with the addition of antioxidants to the plastic products. If there is a large difference between the melting point and the resin melting range of the plastic products, there will be an anti-oxidant bias or the phenomenon of holding the screw.
Plastic products with below the melting point of antioxidant processing temperature above 100 ℃, should first will cause a certain concentration of masterbatch, antioxidant and then mixed with resin processing products, in order to avoid the bias current of antioxidants in products distribution and processing production.
Polyethylene terephthalate PET and polybutylene terephthalate PBT have good photostabilizer properties. After long-term use, the aging degree of the inner or deep of the product is still very low, but the surface of the product is yellow and brittle. PBT is used as an energy-saving lamp shade, and its surface color will gradually turn yellow depending on the time of use or the duration of the lamp.
Resin: PBT1080; Antioxidant: blocked phenol, phosphatate, organic tin thermal stabilizer compound, added 0.5%; Light stabilizer: uv absorber and hindered amine compound, add 2%. Spline and special spline in the blank with four energy-saving lamps (16 w) per homemade aging box, turn on the light irradiation for 60 days in a row, yellow index every 10 days, 60 days to measure tensile strength and impact strength.
The initial yellow light index of blank sample and special materials is about 1.2. The yellow light index is over 3 (yellowish) in 20 days, and the yellow light index is over 6 (yellow) at 50 days. During the 60 days, the yellow light index of special materials was basically unchanged.
Blank sample and special material sample irradiation before and after 60 days in the tensile strength, impact strength data can be seen that the strength of the blank sample by continuous irradiation after 60 days decline is larger, and the tensile strength of the special material samples only fell by 1%, the impact strength by 1.5%.
In the earlier literature, the design of PVC formula is mainly the design of thermal stabilizer, which is true for the production of soft PVC products. The hardness of the product can be achieved by adjusting the amount of DOP, and the external antioxidants are very few. Only a small amount of stearic acid or paraffin can be added. If you use solid metal soap, you can even remove the antioxidant.
And the selection of heat stabilizer variety and use quantity is relatively complex. It depends on whether the product is transparent or even highly transparent, whether it is resistant to sun exposure, toxic and heat and shear strength to choose different types of thermal stabilizer and its proportion and total amount of added.
However, for the design of rigid polyvinyl chloride formula, the author thinks that the difficulty and main content of the formulation design are the proportion of the internal and external antioxidants and the design of adding the total amount.
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.
The amount of antioxidants added cannot be reduced, but the proportion of internal and external antioxidants is even more important. Although the total amount is sufficient, the proportion is disordered, and the qualified products cannot be produced continuously. Current general formula design of PVC workers are mostly in the performance characteristics of various thermal stabilizer and its mechanism are more familiar with, the theory and the law is relatively mature, general reference is also relatively detailed introduction, after careful study, according to the performance requirements, the number of the varieties of heat stabilizer and design generally do not have what problem.
Other auxiliaries, such as processing auxiliaries, anti-impact modifiers, fillers, added varieties and quantity product manuals and reference books are clearly stated. Complicated, such as: smoke suppression flame retardant system, weather resistance, antistatic system system, formulation of the conductive system, even in the reference books are relatively mature theory and laws for formula workers reference.
However, there is no theoretical theory for the anti-oxygen system which is crucial to the processing of rigid PVC. There is no law that can effectively guide the formulation experiment. The only so-called law is to draw on the law of "similar solubility" in ordinary chemistry. Is "the polarity of the antioxidant and the more similar the polarity of the PVC resin, its compatibility, the better, so its antioxidant effect is better, on the other hand, have strong antioxidant effects" but the law to guide the formula design also is very limited.
Because the judgment of the polarity of the antioxidant is according to the chemical structure of antioxidants, antioxidant molecules containing hydroxyl, ester base, carboxyl, amide group and ether base, ketone group polarity can close group of species, quantity and the proportion of long chain alkyl. As antioxidant complex chemical structure, diversity, and close to adjacent group's influence each other, to fight the polarity of the size of the judgment is more difficult, this creates: the polarity of the antioxidants alone to infer antioxidant effect of antioxidants, and antioxidants actually difference between the antioxidant role, far beyond people's imagination.
Glycerol 3-12 - hydroxy stearic acid ester (i.e., hydrogenated castor oil) than three stearic acid glycerol ester (hardener) only three hydroxyl, but less plasticizing time 7 minutes, plasticizing time is reduced by 37%, the soybean oil only more than three stearic acid glycerol ester three double bond, plasticizing time reduced 7.3 minutes more, namely to reduce 38% of plasticizing time.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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