Biomass base structure flame retardant polyol and preparation method and application thereof
A structural flame-retardant, biomass-based technology, applied in the field of biomass-based structural flame-retardant polyurethane foam and its preparation, can solve the problems of complex synthesis process, general flame-retardant performance of polyurethane, and poor binding performance of lignin components and polyurethane. Achieve high reactivity, less catalyst consumption, excellent heat resistance and mechanical properties
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[0023] Example 4:
[0018] Add 302g of cardanol and 162g of 37% wt formaldehyde solution into the reactor and mix uniformly. The temperature is raised to 70°C, and 210g of diethanolamine is added dropwise. The dropping time is 1h. After dripping, react at 90°C for 3h, and continue heating to 110°C. Pressure dehydration. When the moisture content is ≤1.5%wt, 66g ethylene oxide and 87g propylene oxide are circulated for alkoxylation reaction. The reaction temperature is controlled at 120-130℃, and the pressure is controlled at 0.3-0.5MPa. After the oxides, react at constant temperature and pressure for 60 minutes at 120°C / 10 mmHg and evacuate for 30 minutes under reduced pressure to obtain a structured flame-retardant polyol with a hydroxyl value of 386 mg / g KOH and a viscosity of 2100 mPa·s at 25°C. Then, according to the preparation formula of the rigid polyurethane foam in Table 1, the combined polyol was obtained, stirred evenly, and then mixed with the isocyanate and stirred a...
Example Embodiment
[0019] Example 2:
[0020] Add 302g of cardanol, 60g of paraformaldehyde, and 30g of melamine into the reactor and mix uniformly. The temperature is raised to 70°C, and 210g of diethanolamine is added dropwise. The dropping time is 1h. After dripping, react at 90°C for 3h and continue to heat up to 110°C Dehydration under reduced pressure. When the moisture content is less than or equal to 1.5%wt, 80g ethylene oxide and 97g propylene oxide are circulated for alkoxylation reaction. The reaction temperature is controlled at 120-130℃, and the pressure is controlled at 0.3-0.5MPa. After epoxide, react at constant temperature and pressure for 60 minutes, and evacuate under reduced pressure for 30 minutes at 120℃ / 10mmHg to obtain structured flame-retardant polyol. Its hydroxyl value is 406 mg / g KOH, and its viscosity at 25°C is 5100 mPa·s. Then, according to the preparation formula of the rigid polyurethane foam in Table 1, the combined polyol was obtained, stirred evenly, and then mi...
Example Embodiment
[0021] Example 3:
[0022] Add 302g of cardanol, 243g of 37% wt formaldehyde solution, and 60g of melamine into the reactor and mix uniformly. The temperature is raised to 80℃, and 315g of diethanolamine is added dropwise. The addition time is 2h. After the dripping, the reaction is carried out at 100℃ for 4h, and the temperature is continued to 110 ℃, dehydration under reduced pressure, when the moisture content is ≤1.5%wt, 134g of ethylene oxide and 163g of propylene oxide are circulated for alkoxylation reaction, the reaction temperature is controlled at 120-130°C, and the pressure is controlled at 0.3-0.5MPa, After the epoxide is passed through, react at constant temperature and pressure for 60 minutes at 120°C / 10 mmHg and evacuate under reduced pressure for 30 minutes to obtain a structured flame-retardant polyol. Its hydroxyl value is 460 mg / g KOH, and its viscosity at 25°C is 8500 mPa·s. Then, according to the preparation formula of the rigid polyurethane foam in Table 1,...
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