News Details
Colored plastic antioxidant
2018-1-14 22:56:18
Colored plastic antioxidant
The resin molecules of plastic products are induced by light and oxygen to produce high energy and highly reactive oxygen free radicals in the molecule. This kind of free radical can catalyze and accelerate the aging of resin, and it also plays a certain role in the colorant, causing the change of the molecular structure of the colorant and accelerating the change of color of the colorant.
For coloring plastic products, one of the anti-oxidants of colored plastics is to eliminate the anti-stabilizing effect of the colorant and protect the plastic resin. The second is to protect the colorant by protecting the resin. The third one is to protect the colorant directly. For example, fluorescent pigment and other colorants are sensitive to ultraviolet light and have poor light resistance. They need to be protected by diphenylketone or benzotriazole uv absorber in use.
Ultraviolet absorbent light stabilizer is called ultraviolet absorbent, and ultraviolet absorber is divided into diphenylketone and benzotriazole according to different molecular structure. This type of light stabilizer is using its molecular structure, exposure to the colored plastic products of light energy into heat energy, avoid the molecular structure of the colorant, such as organic conjugated double bonds of the colorant chromophore) has been damaged by the light, light oxidation reaction and avoid plastic materials. Uv absorber is a light stabilizer which can directly protect the color of colorants and colored plastic products.
Antioxidants varieties appropriate inside and outside, inside and outside the antioxidant ratio and adding appropriate amount, to reach the appropriate plasticizing rate and melt viscosity (torque rheological curve on appropriate plasticizing time and plasticizing torque). It is to ensure the specific processing equipment and the process, the economic ground, continuously produces the anti-oxygen system of the qualified plastic products, namely the internal and external anti-oxygen system.
Because of the different processing equipment and technology, the resin in the process of heat and shearing force is also different, so the inevitable requirement of resin mixture formulation has different plasticizing rate and melt viscosity, resulting in the diversity of the antioxidant balance. Because "anti-oxygen balance" is not a fixed value, and because of the lack of basic data on the anti-oxygen effect, it is difficult to quantify the oxygen balance. Therefore, we can only use contrast analogy to combat oxygen balance.
In other words, the first study has confirmed that it is an anti-oxygen balance system, and the plasticization of its plastic processing equipment is compared with the plasticization of it on the torque flow curve. Results found that: "antioxidant balance system on torque rheological curve of plasticizing time corresponding to the extruder about two-thirds position, namely corresponding extruder plasticizing period will end, homogenization section will start position.
Triphenyl phosphite (antioxidant, stabilizer TPPi)
Packing method: net weight of 200KG/galvanized iron bucket (a small cabinet to hold 16 tons), 1000KG/IB (a small container with 18 tons) or 23 tons of it.
Port of shipment: Shanghai port
Price quotation validity: 15 days
Warehouse time: within 15 days (customs clearance)
Export rights: our own right to import and export.
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.
If it is not an anti-oxygen balance system, its plasticizing time corresponds to the position of the extruder. When the plasticizing time corresponds to the position of the extruder less than 2/3, it is excessively plasticized, and it is possible for PVC-u to decompose, and the material is yellow. When plasticizing time corresponds to the position of extruder, the plasticization degree is not enough, and the products are worse and brittle. From the above analysis, we can conclude that the "plasticizing time" can be used as the standard to determine whether the antioxidant system is in equilibrium.
The internal antioxidants can promote plasticization and reduce plasticizing torque, and the external antioxidant can delay plasticization and prevent the resin melt from adhering to the metal surface of the processing equipment. Therefore, the plasticizing time of the resin mixture can be controlled by adjusting the ratio of internal and external antioxidants, so that it can meet the plasticizing rate required by specific processing equipment and process.
If the processing equipment of shearing force is too large, the frictional heat generated too much, in the processing is easy decomposition of resin, it must lower processing temperature, in order to avoid resin internal local overheat and cause thermal decomposition.
But resin is a poor conductor of heat, reduce the effect of heating temperature alone is limited, and the most reliable method is to reduce viscosity of resin to radically reduce the frictional heat generated, and click than is appropriately increase dosage of internal and external antioxidant that can reduce the melt viscosity of resin, so that the antioxidant system can meet the requirements of specific processing equipment and process and can continuously produce qualified plastic products.
On the contrary, the cutting force of the processing equipment is small, and the dosage of internal and external antioxidants can be reduced appropriately, which can also meet the requirements of specific equipment. Therefore, the appropriate plasticizing torque is defined as another standard for the internal and anti-oxygen balance. However, the melt viscosity of the material corresponding to the "plasticized torque" on the torsion rheological curve is basically approximate to the material viscosity of pvc-u at the end of the actual processing.
Reasons are as follows: the plasticization of PVC products is far did not reach "equilibrium torque" or 100% plasticizing degree, the plasticizing degree all about 65%, the study suggests that "plasticizing torque" position of extruder two-thirds of place, which is equivalent to extruder plasticizing period will end, homogenization section will start position, the study also pointed out that plastic mixing and plasticizing is basically done in extruder plasticizing period, and further pressure homogenization section mainly material, and plays a role of homogenization and measurement.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The resin molecules of plastic products are induced by light and oxygen to produce high energy and highly reactive oxygen free radicals in the molecule. This kind of free radical can catalyze and accelerate the aging of resin, and it also plays a certain role in the colorant, causing the change of the molecular structure of the colorant and accelerating the change of color of the colorant.
For coloring plastic products, one of the anti-oxidants of colored plastics is to eliminate the anti-stabilizing effect of the colorant and protect the plastic resin. The second is to protect the colorant by protecting the resin. The third one is to protect the colorant directly. For example, fluorescent pigment and other colorants are sensitive to ultraviolet light and have poor light resistance. They need to be protected by diphenylketone or benzotriazole uv absorber in use.
Ultraviolet absorbent light stabilizer is called ultraviolet absorbent, and ultraviolet absorber is divided into diphenylketone and benzotriazole according to different molecular structure. This type of light stabilizer is using its molecular structure, exposure to the colored plastic products of light energy into heat energy, avoid the molecular structure of the colorant, such as organic conjugated double bonds of the colorant chromophore) has been damaged by the light, light oxidation reaction and avoid plastic materials. Uv absorber is a light stabilizer which can directly protect the color of colorants and colored plastic products.
Antioxidants varieties appropriate inside and outside, inside and outside the antioxidant ratio and adding appropriate amount, to reach the appropriate plasticizing rate and melt viscosity (torque rheological curve on appropriate plasticizing time and plasticizing torque). It is to ensure the specific processing equipment and the process, the economic ground, continuously produces the anti-oxygen system of the qualified plastic products, namely the internal and external anti-oxygen system.
Because of the different processing equipment and technology, the resin in the process of heat and shearing force is also different, so the inevitable requirement of resin mixture formulation has different plasticizing rate and melt viscosity, resulting in the diversity of the antioxidant balance. Because "anti-oxygen balance" is not a fixed value, and because of the lack of basic data on the anti-oxygen effect, it is difficult to quantify the oxygen balance. Therefore, we can only use contrast analogy to combat oxygen balance.
In other words, the first study has confirmed that it is an anti-oxygen balance system, and the plasticization of its plastic processing equipment is compared with the plasticization of it on the torque flow curve. Results found that: "antioxidant balance system on torque rheological curve of plasticizing time corresponding to the extruder about two-thirds position, namely corresponding extruder plasticizing period will end, homogenization section will start position.
Triphenyl phosphite (antioxidant, stabilizer TPPi)
Packing method: net weight of 200KG/galvanized iron bucket (a small cabinet to hold 16 tons), 1000KG/IB (a small container with 18 tons) or 23 tons of it.
Port of shipment: Shanghai port
Price quotation validity: 15 days
Warehouse time: within 15 days (customs clearance)
Export rights: our own right to import and export.
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.
If it is not an anti-oxygen balance system, its plasticizing time corresponds to the position of the extruder. When the plasticizing time corresponds to the position of the extruder less than 2/3, it is excessively plasticized, and it is possible for PVC-u to decompose, and the material is yellow. When plasticizing time corresponds to the position of extruder, the plasticization degree is not enough, and the products are worse and brittle. From the above analysis, we can conclude that the "plasticizing time" can be used as the standard to determine whether the antioxidant system is in equilibrium.
The internal antioxidants can promote plasticization and reduce plasticizing torque, and the external antioxidant can delay plasticization and prevent the resin melt from adhering to the metal surface of the processing equipment. Therefore, the plasticizing time of the resin mixture can be controlled by adjusting the ratio of internal and external antioxidants, so that it can meet the plasticizing rate required by specific processing equipment and process.
If the processing equipment of shearing force is too large, the frictional heat generated too much, in the processing is easy decomposition of resin, it must lower processing temperature, in order to avoid resin internal local overheat and cause thermal decomposition.
But resin is a poor conductor of heat, reduce the effect of heating temperature alone is limited, and the most reliable method is to reduce viscosity of resin to radically reduce the frictional heat generated, and click than is appropriately increase dosage of internal and external antioxidant that can reduce the melt viscosity of resin, so that the antioxidant system can meet the requirements of specific processing equipment and process and can continuously produce qualified plastic products.
On the contrary, the cutting force of the processing equipment is small, and the dosage of internal and external antioxidants can be reduced appropriately, which can also meet the requirements of specific equipment. Therefore, the appropriate plasticizing torque is defined as another standard for the internal and anti-oxygen balance. However, the melt viscosity of the material corresponding to the "plasticized torque" on the torsion rheological curve is basically approximate to the material viscosity of pvc-u at the end of the actual processing.
Reasons are as follows: the plasticization of PVC products is far did not reach "equilibrium torque" or 100% plasticizing degree, the plasticizing degree all about 65%, the study suggests that "plasticizing torque" position of extruder two-thirds of place, which is equivalent to extruder plasticizing period will end, homogenization section will start position, the study also pointed out that plastic mixing and plasticizing is basically done in extruder plasticizing period, and further pressure homogenization section mainly material, and plays a role of homogenization and measurement.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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