Fire-retardant cellulose reinforced plastic composite material and preparation method thereof
A technology of flame-retardant cellulose and composite materials, applied in the field of composite materials, can solve problems such as difficult interlayer defects, poor flame-retardant durability, and smoke release that have not been seen in literature reports, and achieve low smoke release and flame-retardant effects lasting effect
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Embodiment 1
[0028] The composite material described in this embodiment consists of 100 parts by weight of polyethylene, 20 parts of flame-retardant modified wood flour, and 20 parts of modified polyethylene. After mixing and melt extrusion, inject into 3 parts (parts by weight, The same below) in the pre-laid polyester filament fiber mold that acts as a reinforcing rib, and then prepared by compression molding. Among them, the material used for flame-retardant modification of wood powder is FR888, the bath ratio of wood powder and modifier solution is 1:3, the reaction temperature is 80°C, and the reaction time is 1.5h; the modifier used in polyethylene is 3 part of azodicarbonamide foaming agent and 5 parts of smoke suppressant ammonium octamolybdate; its preparation process is: the azodicarbonamide and ammonium octamolybdate of said weight part are mixed with 100 parts of polyethylene, and Extrude and granulate with a single-screw extruder to obtain modified polyethylene; the specific s...
Embodiment 2
[0034] In this example, polyethylene has also undergone flame-retardant modification treatment. The specific operation is: after mixing 100 parts by weight of polyethylene, 10 parts by weight of silane-coated ammonium polyphosphate and dipentaerythritol, extrude it with a twin-screw extruder. Pelletizing to obtain flame retardant polyethylene. Wherein, the mass ratio of silane-coated ammonium polyphosphate to dipentaerythritol is 3:1; the rest are the same as in Example 1.
[0035] After testing, the limiting oxygen index of the obtained composite material is 33, the smoke release is not obvious, the tensile strength of the composite material is 53.2MPa, the bending strength is 46MPa, and the impact strength is 18KJ / m 2 .
Embodiment 3
[0037] In this embodiment, polyethylene has also been subjected to flame-retardant modification treatment. The specific operation is: after mixing 100 parts by weight of polyethylene, 10 parts by weight of silane-coated ammonium polyphosphate, dipentaerythritol and zinc oxide, extruder with twin-screw Extrude and granulate to obtain flame-retardant polyethylene. Wherein, the mass ratio of silane-coated ammonium polyphosphate to dipentaerythritol is 3:1; the rest are the same as in Example 1.
[0038] After testing, the limiting oxygen index of the obtained composite material is 34.7, the smoke release is not obvious, the tensile strength of the composite material is 52.1MPa, the bending strength is 45.3MPa, and the impact strength is 16.9KJ / m 2 .
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