Expansion type flame-retardant polypropylene composite material and preparation method thereof
A technology of flame-retardant polypropylene and intumescent flame retardant, which is applied in the field of flame-retardant polypropylene materials, can solve the problems of low flame-retardant efficiency, large addition amount, and large hygroscopicity, and achieve high flame-retardant efficiency and low smoke density , the effect of small amount of smoke
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[0029] The preparation method of the above-mentioned flame retardant polypropylene composite material comprises the following sequential steps: (1) putting intumescent flame retardant, flame retardant synergist, antioxidant, anti-dripping agent and lubricant into a high-speed mixer according to the formula ratio Internal mixing for 8-20 minutes; (2) Put polypropylene into a high-speed mixer, and mix with the above-mentioned mixture for 5-20 minutes; (3) Extrude and granulate with a twin-screw extruder, or mix with a twin-roll mixer evenly.
[0030] The present invention will be further described below through specific examples, but the present invention is not limited to this specific example.
[0031] The triazine char-forming agent in each embodiment adopts the material of following structural formula respectively:
[0032]
Example Embodiment
[0033] Example 1
[0034] Accurately weigh 1.0kg of ammonium polyphosphate (APP), 0.5kg of triazine char-forming agent (CA1), 0.015kg of antioxidant 1010 and 0.005kg of zinc stearate, premix in high-speed dispersant for 8 minutes to obtain Intumescent flame retardant compound, then 3.48Kg of polypropylene pellets were added to the above intumescent flame retardant compound, premixed for 5 minutes, and finally extruded, cooled and pelletized in a twin-screw extruder, The halogen-free flame retardant polypropylene composite material can be obtained. Wherein, the temperature of each zone of the twin-screw extruder is set between 150-200°C. The oxygen index of the obtained intumescent flame-retardant polypropylene composite material was 35.6%, and the UL-94 test reached V-0 level.
Example Embodiment
[0035] Example 2
[0036] Accurately weigh 1.0kg of ammonium polyphosphate (APP), 0.5kg of triazine char-forming agent (CA2), 1680.015kg of antioxidant and 0.005kg of N,N-ethylenebisstearic acid amide (EBS). The dispersant was premixed for 10 minutes to obtain an intumescent flame retardant compound, and then 3.48Kg of polypropylene pellets were added to the above intumescent flame retardant compound, premixed for 5 minutes, and finally extruded in a twin-screw extruder. The halogen-free flame retardant polypropylene composite material can be obtained by extruding, cooling and pelletizing in the middle. Among them, the temperature of each zone of the twin-screw extruder is between 150-200°C. The oxygen index of the polypropylene composite is 29.5%, and the UL-94 test achieves a V-0 rating.
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