- Novel high-temperature-resistant phosphite antioxidant ST-636 and preparation method and application thereof
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The invention discloses a novel high-temperature-resistant phosphite antioxidant ST-636 and a preparation method and application thereof. The preparation method comprises the following steps: S1, adding reaction mesitylene, pentaerythritol and phosphorus trichloride into a reaction container, and reacting to generate an intermediate, S2, vacuumizing the reaction container, and carrying out a reflux reaction, S3, adding new mesitylene, BHT, triethylamine and di-n-butylamine for reaction to obtain a reaction solution, S4, adding tri-n-butylamine and triethanolamine to carry out neutralization reaction to obtain a product mixed solution, S5, adding a filter aid type diatomite, and then carrying out hot filtration, S6, washing, filtering and drying the crystals, and S7, adding a sodium hydroxide aqueous solution, and carrying out a replacement reaction to obtain the di-n-butylamine. The novel phosphite antioxidant ST-636 prepared by the method has excellent heat-resistant stability and volatility resistance, is widely applied to special plastics with higher processing temperature, and effectively improves and enhances the high-melting processing heat stability, discoloration resistanceand fluid melting stability of the special plastics.
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Paragraph 0047; 0051-0055
(2020/10/20)
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