Description
ANTIOXIDANT 168 is a secondary antioxidant with excellent resistance to extraction by water, low volatility and high heat stability. It can effectively decompose hydroperoxides produced during the processing of polymeric materials. ANTIOXIDANT 168 usually not used alone, is compounded with hindered phenolic primary antioxidants such as 1010 to improve thermostability of polymer during the processing. There are over ten kinds of blends of 168 with phenolic antioxidants, widely use in the polymer materials such as PE, PP, PA, PC, ABS and so on.
Uses
This product is an excellent Antioxidant wnameely applied to polyethylene, polypropylene, polyoxymethylene, ABS resin, PS resin, PVC, engineering plastics, binding agent, rubber, petroleum etc. for product polymerization.
Application
Antioxidant 168 is a kind of phosphite ester antioxidant as processing stabilizer, used for polypropylene, polyethylene, and adhesives. The amount to be used may be 0.1%~1.0% depending on the substrate, processing conditions, and requirements of the end application. Blends with hindered phenols are particularly effective.In addition, they use combination with light stabilizers when need.
Definition
ChEBI: Phenol, 2,4-bis(1,1-dimethylethyl)-, phosphite (3:1) is an alkylbenzene.
General Description
Tris(2,4-di-tert-butylphenyl) phosphite is a triaryl based phosphite that can be used in catalysis and metallation. Its characteristic to undergo metallation reaction and provide a cost effective synthetic processes allows it to be useful in biaryl coupling reactions.
Flammability and Explosibility
Notclassified
Synthesis
(1) First, 11.0 g of 2,4-di-tert-butylphenol was added to a 250 mL three-neck flask. Subsequently, 22 mg of diatomaceous earth-loaded pyridine catalyst and 400 mL of a solvent mixture of methanol and toluene (1:1 by volume) were added. A magnetic stirrer, reflux condenser tube were installed and a thermometer and a dropping funnel were fixed at the remaining two ports of the three-necked flask, respectively. (2) Place the reaction apparatus in step (1) in an oil bath and programmatically warm the reaction mixture at a rate of 5 °C/10 min to 40 °C and stir the reaction mixture at this temperature. (3) A solution of 5.57 g of phosphorus trichloride dissolved in 30 mL of toluene was slowly added dropwise through a dropping funnel to the reaction system in step (2), with a controlled dropping time of 15 min. After the dropwise addition was completed, the reaction was continued to be heated to 95 °C and maintained for 30 min. Upon completion of the reaction, the solvent was removed by distillation under reduced pressure. The crude product was recrystallized with hexane to give tris(2,4-di-tert-butylphenyl) phosphite in 98.3% yield and 98.9% purity.
Properties and Applications
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TEST ITEMS
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SPECIFICATION
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APPEARANCE
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WHITE INCOMPACT POWDER
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CONTENT
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99.0% min
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MELTING RANGE
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183-187 °C
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VOLATILE
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0.3% max
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SOLUBILITY 2g/20ml TOLUENE
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CLEAR
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FREE 2,4-DITERT-BUTYPHENOL
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0.2% max (wt)
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TRANSMITTANCE
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98% min 425nm
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98% min 500nm
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ACID VALUE,mg KOH/g
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0.3% max
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HYDROLYSIS TIME (90°C
WATER
）
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14 h min
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SOLUBILITY
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1% ACETONE
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30% TOLUENE
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36% CHLOROFORM
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4% ETHYL ACETATE
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11% n-HEXANE
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0.1% ETHANOL
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36% DICHLOROETHANE
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6% max PHENYLETHYLENE
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0.01% max WATER
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References
[1] Patent: CN108467406, 2018, A. Location in patent: Paragraph 0038-0040; 0044-0046; 0050-0052; 0056-0058; 0062
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