Antioxidant 168 is an excellent phosphite antioxidant. It appears as a white powder and is easily soluble in benzene, chloroform, cyclohexane and other organic compounds. Solvent, slightly soluble in ethanol, acetone, insoluble in water, alcohol and other polar solvents, slightly soluble in esters. It has low toxicity, low volatility, high thermal stability, and excellent hydrolysis resistance. It can effectively decompose hydroperoxides generated during the thermal processing of polymeric materials.
The production method of antioxidant 168 is as follows:
1. Direct method: After heating and melting 2,4-di-tert-butylphenol, add Phosphorus trichloride reacts at a maximum reaction temperature of 190 to 200°C. Use ethanol to wash away unreacted 2,4-di-tert-butylphenol, then wash away phosphorus trichloride and hydrogen chloride with water, and finally recrystallize in high-grade ether and filter to obtain the finished product.
2. Solvent method: Use toluene or xylene as the solvent and amines as the catalyst to react 2,4-di-tert-butylphenol with phosphorus trichloride. The reactant is alcohol or water. After separation and washing, the finished product is obtained.
The uses of antioxidant 168 are as follows:
It has a good synergistic effect when used together with hindered amine antioxidants 1010 and 1076, which can improve the quality of polymeric materials. Stability during thermal processing. There are more than a dozen preparations compounded with phenolic antioxidants, which are widely used in polyolefins (such as polyethylene, polypropylene) and olefin copolymers, polyamide, polycarbonate, PS resin, PVC, engineering plastics, rubber And petroleum products, ABS resin and other polymer materials. The compounds can also be used in adhesives, natural or synthetic adhesive resins, etc. The general dosage is 0.1%~1.0%.
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