News Details
Sulfur containing antioxidant
2017-12-30 18:31:40
Sulfur containing antioxidant can decompose hydroperoxide, inhibit oxidation and have synergistic effect with phenolic antioxidants, with low toxicity and small odor. The development of sulfur containing antioxidants has been slow. The sulfur containing antioxidants produced in China can be divided into 3 kinds, namely thiocarbamate antioxidants, thiosulfide antioxidants and sulfide phenols antioxidants.
Thio two propionic acid double twelve alcohol ester (DL TP, DL TDP) for the appearance of white powder or flake, soluble in benzene, benzene, ketone, solvent oil, peroxide decomposition has effect, can be used as auxiliary antioxidant polyethylene, polypropylene ABS resin, PVC, has no color, no pollution, no decomposition high temperature processing time.
Thiopropionic acid, two, eighteen DSTP (DSTDP) is white crystal or powder. It has small odor, low toxicity, soluble in benzene, imitation and sulfurized carbon. It is hard to dissolve in two methyl formamide and xylene. It is insoluble in acetone, ethanol and water. Mainly used as rubber, grease, soap, oil, grease and other antioxidants in polyolefin, due to high temperature volatile small, also can be used as heat stabilizer and polypropylene resin, 4, 4 '- thiobis (6- tert butyl -3- methyl) phenol and can obtain excellent synergistic effect should be.
Thiobisphenol antioxidant molecules containing hindered phenol structure in plastic material can exhibit high antioxidant properties, heat resistance and other characteristics, there are 300 main varieties of chemical antioxidant, 4, 4 '- thiobisphenol kind of antioxidants, due to its special structure, which has dual function of free radical termination agent and hydrogen peroxide decomposition agent, carbon black and common show a synergistic effect is excellent, the commonly used antioxidant incomparable. It is mainly used for crosslinked polyethylene wire and cable, heat-resistant pipe, shrinkable pipe and so on. The antioxidant 300 is not ideal for the coloring and protecting properties of plastic materials. It needs to be used with DL TP or DSTP.
There are 1035 main varieties of sulfide type antioxidant phenolic antioxidant, chemical name 2, 2 '- thiobis [3- (3, 5- Di tert butyl -4- hydroxyphenyl) propionate], the appearance is white crystal powder, odorless, low toxic, insoluble in water, soluble in methanol, ethanol, benzene, etc. organic solvent. It can be widely used in various kinds of plastics, rubber and paint, and can also be used in AB SPS, PU PA and so on. It has good antioxidant effect. Because the raw material of antioxidant 1035 is 3, 5- methanol and sulfur two glycols, and sulfur two ethylene glycol belongs to the second class of monitoring chemicals. Its source is limited and the price is high, so that the production of antioxidant 1035 is restricted by raw materials and cost.
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.
Comparing the amount of C1, C2 and C3 (fixed antioxidant 168), it can be found that the retention rate of tensile strength and elongation at break increases first and then decreases with the increase of 1010, that is, when 1010 dosage is 0.1 parts, the anti-aging property of polyethylene is better.
Possible reasons for this phenomenon is that when adding 1010 less cannot fully capture the light and oxygen free radicals in the aging process; and when the adding amount of 1010 excess, excess 1010 susceptible to direct oxidation and the formation of active oxygen free radicals, but accelerated the degradation of polyethylene chain free radical, reduce the mechanical properties material.
Comparison of C2, C4 and C5 (fixed amount of antioxidant 1010), tensile strength retention and retention of elongation increases with the increase of 168, and the light stabilizer was 1010, when the dosage is 0.1, 168 and 0.15 phr, polyethylene anti aging performance is more excellent.
When UV Absorbents are used alone, UV326 is better than UV531, and the combination of UV Absorbents and hindered amines 770 is better for 770 and UV326. The synergistic effect of antioxidants and light stabilizers can significantly improve the aging resistance of polyethylene. When antioxidant 1010 and antioxidant 168 are added together, the anti-aging effect is better. When the dosage of antioxidant 1010 is 0.1 and the dosage of 168 is 0.15, the anti aging property of polyethylene is better when the antioxidant is mixed with light stabilizer.
There are many ways to evaluate the stability of thermal oxidation of plastics. People like to use a variety of thermal analysis techniques, such as differential thermal analysis (DTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and thermomechanical analysis (TMA). One of the great benefits of these methods is that data can be obtained in a very short time.
Relatively high temperature, but usually under the melting point of polymer, accelerated aging in the oven (using circulating air or sometimes pure oxygen) is one of the most widely applied testing methods (for example, DIN53383 part I, ISO77-1983). Test criteria including spectral data, such as infrared spectroscopy based (DIN53383 second) or radical concentration data, the determination of the leg color and mechanical properties of colorimetric method, such as impact strength, tensile strength and tensile.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Thio two propionic acid double twelve alcohol ester (DL TP, DL TDP) for the appearance of white powder or flake, soluble in benzene, benzene, ketone, solvent oil, peroxide decomposition has effect, can be used as auxiliary antioxidant polyethylene, polypropylene ABS resin, PVC, has no color, no pollution, no decomposition high temperature processing time.
Thiopropionic acid, two, eighteen DSTP (DSTDP) is white crystal or powder. It has small odor, low toxicity, soluble in benzene, imitation and sulfurized carbon. It is hard to dissolve in two methyl formamide and xylene. It is insoluble in acetone, ethanol and water. Mainly used as rubber, grease, soap, oil, grease and other antioxidants in polyolefin, due to high temperature volatile small, also can be used as heat stabilizer and polypropylene resin, 4, 4 '- thiobis (6- tert butyl -3- methyl) phenol and can obtain excellent synergistic effect should be.
Thiobisphenol antioxidant molecules containing hindered phenol structure in plastic material can exhibit high antioxidant properties, heat resistance and other characteristics, there are 300 main varieties of chemical antioxidant, 4, 4 '- thiobisphenol kind of antioxidants, due to its special structure, which has dual function of free radical termination agent and hydrogen peroxide decomposition agent, carbon black and common show a synergistic effect is excellent, the commonly used antioxidant incomparable. It is mainly used for crosslinked polyethylene wire and cable, heat-resistant pipe, shrinkable pipe and so on. The antioxidant 300 is not ideal for the coloring and protecting properties of plastic materials. It needs to be used with DL TP or DSTP.
There are 1035 main varieties of sulfide type antioxidant phenolic antioxidant, chemical name 2, 2 '- thiobis [3- (3, 5- Di tert butyl -4- hydroxyphenyl) propionate], the appearance is white crystal powder, odorless, low toxic, insoluble in water, soluble in methanol, ethanol, benzene, etc. organic solvent. It can be widely used in various kinds of plastics, rubber and paint, and can also be used in AB SPS, PU PA and so on. It has good antioxidant effect. Because the raw material of antioxidant 1035 is 3, 5- methanol and sulfur two glycols, and sulfur two ethylene glycol belongs to the second class of monitoring chemicals. Its source is limited and the price is high, so that the production of antioxidant 1035 is restricted by raw materials and cost.
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.
Comparing the amount of C1, C2 and C3 (fixed antioxidant 168), it can be found that the retention rate of tensile strength and elongation at break increases first and then decreases with the increase of 1010, that is, when 1010 dosage is 0.1 parts, the anti-aging property of polyethylene is better.
Possible reasons for this phenomenon is that when adding 1010 less cannot fully capture the light and oxygen free radicals in the aging process; and when the adding amount of 1010 excess, excess 1010 susceptible to direct oxidation and the formation of active oxygen free radicals, but accelerated the degradation of polyethylene chain free radical, reduce the mechanical properties material.
Comparison of C2, C4 and C5 (fixed amount of antioxidant 1010), tensile strength retention and retention of elongation increases with the increase of 168, and the light stabilizer was 1010, when the dosage is 0.1, 168 and 0.15 phr, polyethylene anti aging performance is more excellent.
When UV Absorbents are used alone, UV326 is better than UV531, and the combination of UV Absorbents and hindered amines 770 is better for 770 and UV326. The synergistic effect of antioxidants and light stabilizers can significantly improve the aging resistance of polyethylene. When antioxidant 1010 and antioxidant 168 are added together, the anti-aging effect is better. When the dosage of antioxidant 1010 is 0.1 and the dosage of 168 is 0.15, the anti aging property of polyethylene is better when the antioxidant is mixed with light stabilizer.
There are many ways to evaluate the stability of thermal oxidation of plastics. People like to use a variety of thermal analysis techniques, such as differential thermal analysis (DTA), differential scanning calorimetry (DSC), thermogravimetric analysis (TG) and thermomechanical analysis (TMA). One of the great benefits of these methods is that data can be obtained in a very short time.
Relatively high temperature, but usually under the melting point of polymer, accelerated aging in the oven (using circulating air or sometimes pure oxygen) is one of the most widely applied testing methods (for example, DIN53383 part I, ISO77-1983). Test criteria including spectral data, such as infrared spectroscopy based (DIN53383 second) or radical concentration data, the determination of the leg color and mechanical properties of colorimetric method, such as impact strength, tensile strength and tensile.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
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