Halogen-free flame retardant namely expandable polystyrene particle and preparation method thereof
A technology of expandable polystyrene and flame retardant, applied in the field of foamed plastics, can solve problems such as difficult to reach B1 level, difficult to reach 032 level, secondary pollution, etc., to improve heat preservation effect and smoke emission Small, reduced concentration effect
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[0036] A preparation method of expandable polystyrene particles of a halogen-free flame retardant, comprising the following steps:
[0037] A. Add 100 parts of styrene, 6 to 10 parts of flame retardant, 0.2 to 0.8 parts of flame retardant synergist, 2.0 to 5.5 parts of graphite, and 0.05 to 0.1 parts of emulsifier into the reactor in sequence, and stir for 0.5 to 1 hour to obtain Flame retardant styrene paste;
[0038] B. Add 200 to 400 parts of water and 0.2 to 1 part of dispersant into the reactor, mix and stir for 15 to 30 minutes to obtain a water-based matrix, then add the flame-retardant styrene slurry prepared in step A, and mix and stir for 2.5 to 8.5 hours ;
[0039] C. Introduce high-temperature steam into the reactor, add 1.5-2.5 parts of nucleating agent, 0.6-1.5 parts of plasticizer and 0.5-1.0 parts of initiator when the temperature is raised to 50-55 °C at a rate of 0.5-1.0 °C / min and Continue to stir, continue to heat up to 88.5-89.5°C, carry out low-temperat...
Embodiment 1
[0043] A. Add 100 parts of styrene, 6 parts of flame retardant, 0.2 parts of flame retardant synergist, 2.0 parts of graphite, and 0.05 parts of emulsifier into the reaction kettle in sequence according to the addition amount of Example 1 in Table 1, and stir for 0.5 to 1 hour. Prepare flame retardant styrene slurry;
[0044] B. Add 200 parts of water and 0.2 parts of dispersant to the reactor, mix and stir for 15-30 minutes to obtain a water-based matrix, then add the flame-retardant styrene slurry prepared in step A, and mix and stir for 2.5-8.5 hours;
[0045] C. Introduce high-temperature steam into the reaction kettle, add 1.5 parts of nucleating agent, 0.6 parts of plasticizer and 0.5 parts of initiator when the temperature is raised to 50-55 degrees Celsius at a rate of 0.5-1.0 °C / min and continue to stir, and continue to heat up to 88.5~89.5℃, carry out low temperature granulation reaction, maintain this temperature and low temperature granulation for 5.5~6h;
[0046]...
Embodiment 2
[0049] A. Add 100 parts of styrene, 6.4 parts of flame retardant, 0.26 parts of flame retardant synergist, 2.35 parts of graphite, and 0.055 parts of emulsifier into the reaction kettle in sequence according to the addition amount of Example 2 in Table 1, and stir for 0.5 to 1 hour , to prepare flame retardant styrene slurry;
[0050] B. Add 220 parts of water and 0.28 parts of dispersant to the reactor, mix and stir for 15-30 minutes to obtain a water-based matrix, then add the flame-retardant styrene slurry prepared in step A, and mix and stir for 2.5-8.5 hours;
[0051] C. Introduce high-temperature steam into the reaction kettle, add 1.6 parts of nucleating agent, 0.68 parts of plasticizer and 0.52 parts of initiator when the temperature is raised to 50-55 degrees Celsius at a rate of 0.5-1.0 °C / min and continue to stir, and continue to heat up to 88.5~89.5℃, carry out low temperature granulation reaction, maintain this temperature and low temperature granulation for 5.5~6...
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