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Industrial use of antioxidants
2018-1-12 11:38:51
Industrial use of antioxidants
When choosing industrial USES antioxidants, should be according to the types of plastic materials and types, processing equipment and process condition, other varieties of chemical additives and the addition amount, products using the environment and time limit factors such as comprehensive determine the variety of industrial USES antioxidants.
The ec commission regulations UV - 326 with food contact plastic materials limited, the largest capacity in polypropylene PP, polyethylene PE was 0.5%, the maximum limit in the PVC is 0.3%, maximum limit of 0.6% in the polystyrene PS.
The corresponding selection relation between the common industrial use antioxidant and the common resin. This relationship only provides a starting point for the design formulation, and the specific antioxidant varieties should be determined by the test results.
Same main series resins for polymerization process, the different molecular structure, divided into several series, such as the high density polyethylene HDPE polyethylene PE series, low density polyethylene (LDPE, linear low density polyethylene (LLDPE, PVC series of hard PVC U - PVC, soft PVC P - PVC, impact resistant and I - PVC, etc. In the same main series of resin, there are differences in the thermal oxidation and anti-photooxidation capacity of different series of resin, and the design of plastic formula should be understood.
The effect of colorant on the action of oxygen agent. Chrome yellow is an opaque inorganic colorant, which can be used in polyolefin, polystyrene, acrylic resin and other thermoplastic plastics, which have strong coloring power, good covering property, good water resistance and solvent resistance. But because of the chrome yellow is lead chromate or alkali type of lead chromate with lead sulfate of lead compounds and sulfur antioxidants such as DLTP, DSTP and 1035, 300 share, under the condition of the high temperature of plastic processing can produce chemical reaction, generate black lead sulfide, affect the appearance of the plastic products, also greatly weaken the heat oxygen aging of antioxidant effect. Therefore, chromium colorants cannot be Shared with sulfur-containing antioxidants.
The polypropylene molecular chain contains tertiary carbon atoms, which are easily decomposed by oxygen and must be protected against aging in the process of processing, storage and application. In colouring polypropylene, certain colorants react chemically with low molecular blocking phenol antioxidants, which weakens the antioxidant effect. The effects of some colorants on the anti-oxidants of polypropylene and low molecular phenols can be divided into three types:
Serious effects: tanning carbon black, single azo red 3B, quinacridine magenta, phthalocyanine blue, iron oxide yellow brown;
Medium effect: phthalocyanine green, furnace black, group green, chromium oxide green;
Effects: cadmium yellow, mercury cadmium red, rutile titanium dioxide.
When the pearl powder is used in some resins with monophenol antioxidant BHT, it will cause the white products to turn yellow and lead to product quality problems.
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, when is given priority to with metal stabilizer, cooperate with this product can reduce the harm of metal chlorides, maintain product transparency, and inhibition of color change, is also a good chemical intermediates, with phosphorus-containing flame retardant and use, can play a role of flame retardant antioxidant, and with stable performance, light can be used for synthesis alkyd resin and polyester, main raw materials for resin, this product can also be preparing pesticide intermediates trimethyl phosphite.
The effect of colorant on the effect of light stabilizer in the coloring plastic products has two main effects. First, the colorant contains copper, manganese, nickel and other heavy metal elements or impurities, with light activity, photosensitivity, catalyzing and accelerating the photoaging speed of plastic materials.
Phthalocyanine, which contains free copper and impurities, causes the polypropylene to age; Iron oxide red can reduce the efficiency of benzene and triazole, diphenylketone and organic nickel salt in polypropylene. For polyethylene, titanium dioxide, group green, chromium oxide green, cobalt green, iron red and other colorant use, will aggravate the light aging.
The second is that the colorant of certain molecular structure can interact with the light stabilizer, which directly weakens the efficiency of the light stabilizer. Acid colorant can be used to invalidate the hindered amine light stabilizer; In polypropylene, azo red, yellow and hindered amine light stabilizer, azo condensation red BR and azo condensation yellow 3G can reduce the effect of blocking amine light stabilizer by 25% and 50% respectively.
Table 8 shows the effect of different colorants on the photostability of high pressure polyethylene containing benzotriazole photostabilizer (uv-328). It can be seen that orange chrome yellow significantly improves the light stability of high pressure polyethylene, and the phthalocyanine green and group green have slightly increased or not much influence, while cadmium yellow reduces the light stability of high pressure polyethylene.
F.S teinlin and baron ear in different colorants (1%), 1010 (0.1%), antioxidants, light stabilizer 770 (0.5%) and polypropylene spinning under 285 ℃, and the tensile 4 times, for 80 points / 24 root fiber. This fiber is tested by xenon lamp, and when the intensity is reduced by 50%, the radiation quantity of the sample is compared. The results showed that the polypropylene fibers, which were stained with organic pigment yellow, red and orange respectively, were less stable than those of the uncolored polypropylene fiber, although they were added to the antioxidant and light stabilizer.
Antioxidant 1010 is the main antioxidant of phenol, which is one of the excellent varieties of antioxidant. Excellent oxidation resistance to polypropylene and polyethylene. It can effectively prolong the life of the product. This product has low volatility, good extraction resistance, high thermal stability, long lasting effect, no stain, no pollution, no toxicity. This product has synergistic effect with antioxidant DLTP, DSTP and 168. This product is used in polyvinyl chloride, polystyrene, ABS, polyurethane and other resins have excellent thermal resistance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
When choosing industrial USES antioxidants, should be according to the types of plastic materials and types, processing equipment and process condition, other varieties of chemical additives and the addition amount, products using the environment and time limit factors such as comprehensive determine the variety of industrial USES antioxidants.
The ec commission regulations UV - 326 with food contact plastic materials limited, the largest capacity in polypropylene PP, polyethylene PE was 0.5%, the maximum limit in the PVC is 0.3%, maximum limit of 0.6% in the polystyrene PS.
The corresponding selection relation between the common industrial use antioxidant and the common resin. This relationship only provides a starting point for the design formulation, and the specific antioxidant varieties should be determined by the test results.
Same main series resins for polymerization process, the different molecular structure, divided into several series, such as the high density polyethylene HDPE polyethylene PE series, low density polyethylene (LDPE, linear low density polyethylene (LLDPE, PVC series of hard PVC U - PVC, soft PVC P - PVC, impact resistant and I - PVC, etc. In the same main series of resin, there are differences in the thermal oxidation and anti-photooxidation capacity of different series of resin, and the design of plastic formula should be understood.
The effect of colorant on the action of oxygen agent. Chrome yellow is an opaque inorganic colorant, which can be used in polyolefin, polystyrene, acrylic resin and other thermoplastic plastics, which have strong coloring power, good covering property, good water resistance and solvent resistance. But because of the chrome yellow is lead chromate or alkali type of lead chromate with lead sulfate of lead compounds and sulfur antioxidants such as DLTP, DSTP and 1035, 300 share, under the condition of the high temperature of plastic processing can produce chemical reaction, generate black lead sulfide, affect the appearance of the plastic products, also greatly weaken the heat oxygen aging of antioxidant effect. Therefore, chromium colorants cannot be Shared with sulfur-containing antioxidants.
The polypropylene molecular chain contains tertiary carbon atoms, which are easily decomposed by oxygen and must be protected against aging in the process of processing, storage and application. In colouring polypropylene, certain colorants react chemically with low molecular blocking phenol antioxidants, which weakens the antioxidant effect. The effects of some colorants on the anti-oxidants of polypropylene and low molecular phenols can be divided into three types:
Serious effects: tanning carbon black, single azo red 3B, quinacridine magenta, phthalocyanine blue, iron oxide yellow brown;
Medium effect: phthalocyanine green, furnace black, group green, chromium oxide green;
Effects: cadmium yellow, mercury cadmium red, rutile titanium dioxide.
When the pearl powder is used in some resins with monophenol antioxidant BHT, it will cause the white products to turn yellow and lead to product quality problems.
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, when is given priority to with metal stabilizer, cooperate with this product can reduce the harm of metal chlorides, maintain product transparency, and inhibition of color change, is also a good chemical intermediates, with phosphorus-containing flame retardant and use, can play a role of flame retardant antioxidant, and with stable performance, light can be used for synthesis alkyd resin and polyester, main raw materials for resin, this product can also be preparing pesticide intermediates trimethyl phosphite.
The effect of colorant on the effect of light stabilizer in the coloring plastic products has two main effects. First, the colorant contains copper, manganese, nickel and other heavy metal elements or impurities, with light activity, photosensitivity, catalyzing and accelerating the photoaging speed of plastic materials.
Phthalocyanine, which contains free copper and impurities, causes the polypropylene to age; Iron oxide red can reduce the efficiency of benzene and triazole, diphenylketone and organic nickel salt in polypropylene. For polyethylene, titanium dioxide, group green, chromium oxide green, cobalt green, iron red and other colorant use, will aggravate the light aging.
The second is that the colorant of certain molecular structure can interact with the light stabilizer, which directly weakens the efficiency of the light stabilizer. Acid colorant can be used to invalidate the hindered amine light stabilizer; In polypropylene, azo red, yellow and hindered amine light stabilizer, azo condensation red BR and azo condensation yellow 3G can reduce the effect of blocking amine light stabilizer by 25% and 50% respectively.
Table 8 shows the effect of different colorants on the photostability of high pressure polyethylene containing benzotriazole photostabilizer (uv-328). It can be seen that orange chrome yellow significantly improves the light stability of high pressure polyethylene, and the phthalocyanine green and group green have slightly increased or not much influence, while cadmium yellow reduces the light stability of high pressure polyethylene.
F.S teinlin and baron ear in different colorants (1%), 1010 (0.1%), antioxidants, light stabilizer 770 (0.5%) and polypropylene spinning under 285 ℃, and the tensile 4 times, for 80 points / 24 root fiber. This fiber is tested by xenon lamp, and when the intensity is reduced by 50%, the radiation quantity of the sample is compared. The results showed that the polypropylene fibers, which were stained with organic pigment yellow, red and orange respectively, were less stable than those of the uncolored polypropylene fiber, although they were added to the antioxidant and light stabilizer.
Antioxidant 1010 is the main antioxidant of phenol, which is one of the excellent varieties of antioxidant. Excellent oxidation resistance to polypropylene and polyethylene. It can effectively prolong the life of the product. This product has low volatility, good extraction resistance, high thermal stability, long lasting effect, no stain, no pollution, no toxicity. This product has synergistic effect with antioxidant DLTP, DSTP and 168. This product is used in polyvinyl chloride, polystyrene, ABS, polyurethane and other resins have excellent thermal resistance.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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