A preparation method of flame-retardant expandable polystyrene pellets containing exfoliated graphite
A technology of expandable polystyrene and exfoliated graphite, which is applied in the field of preparation of flame-retardant expandable polystyrene pellets, can solve the problem of easy agglomeration, uneven dispersion of graphite particles, and flame-retardant expandable polystyrene. Problems such as poor thermal insulation performance, to achieve the effect of improving dispersibility and reducing the tendency of agglomeration
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specific Embodiment approach 1
[0013] Specific embodiment one: the preparation method of a kind of flame-retardant expandable polystyrene pellet containing exfoliated graphite of the present embodiment is to carry out according to the following steps:
[0014] 1. 100 parts by weight of styrene, 100-300 parts of water, 1-20 parts of expandable graphite, 0.1-1 part of dibenzoyl peroxide, 0.2-2 parts of dispersant, 0.01-1 part of emulsifier , 7 to 10 parts of pentane;
[0015] 2. Add the expandable graphite and 0.1-2 parts of flame retardant weighed in step 1 to the styrene weighed in step 1, and ultrasonically disperse for 30-60 minutes to obtain a mixture. Diphenyl peroxide weighed in step 1 Formyl is added to the mixture, heated to 80-90°C at a stirring speed of 200-400 rpm and reacted for 1-5 hours to obtain the first mixture;
[0016] 3. Add the dispersant weighed in step 1 into the water weighed in step 1, and vibrate ultrasonically for 30-60 minutes to obtain the second mixture;
[0017] 4. Add the se...
specific Embodiment approach 2
[0021] Embodiment 2: This embodiment differs from Embodiment 1 in that: the particle size of the expandable graphite in step 1 is 50-150 μm. Others are the same as in the first embodiment.
specific Embodiment approach 3
[0022] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that: the particle size of the expandable graphite in step 1 is 50-100 μm. Others are the same as in the first or second embodiment.
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