Micron-nano silicon carbide/polypropylene composite and preparation method thereof
A nano-silicon carbide and composite material technology, which is applied in the field of polymer-based composite materials and new materials, can solve the problems of limiting the expansion and application of PP-based materials, large molding shrinkage, and high low-temperature brittleness, and achieves excellent oxidation resistance and energy saving Resin, good effect of wear resistance
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Embodiment 1
[0032] Composite material of the present invention and preparation method are as follows: adopt micro-nanometer SiC micropowder as the filler of polypropylene (PP) matrix, the particle size distribution of micron SiC and nanometer SiC see figure 1 , the particle size of micron-sized SiC is 10 μm, and the particle size range of nano-sized SiC is 50-200 nm. The surface modification treatment of micron-sized SiC powder is completed in a high-speed mixer with an automatic temperature control system and a stepless speed regulating motor. While stirring at a high speed, the coupling agent diluted with a diluent is added with a syringe, according to Condition test results (wet method modification) determine the surface treatment process conditions of micro-nano SiC particles as follows: use silane / titanate mixed coupling agent as the surface treatment agent, and the amount of coupling agent is 1.0% of the SiC particle mass. Water ethanol was used as diluent, the ratio of coupling age...
Embodiment 2
[0034] In this embodiment, micro-nano SiC powder is used as the filler of polypropylene (PP) matrix, and the particle size distribution of micro-SiC and nano-SiC is shown in figure 1 . The surface modification treatment of the micro-nano SiC powder is completed in a high-speed mixer with an automatic temperature control system and a stepless motor (the mass percentage of nano-SiC in the micro-nano SiC composite particles is 5%). The process conditions for the surface modification of SiC particles are determined as follows: use silane / titanate mixed coupling agent as the surface treatment agent, the amount of coupling agent is 1.0% of the mass of SiC particles, absolute ethanol is used as the diluent, and the coupling agent and The ratio of thinner is 1:8. The treatment temperature is 100°C, and the treatment time is 30 minutes.
Embodiment 3
[0036] This example is the preparation method of unmodified micro-SiC / PP composite material: polypropylene (PP) is selected as the polymer matrix material, and micro-SiC without surface modification is mixed with PP. The particle size of micro-SiC is shown in figure 1 , Melt blending, extrusion, and granulation are carried out at a ratio of micron SiC / PP components of 5:95, 10:90, 20:80, 30:70, 40:60, and 50:50 (mass ratio), The extrusion temperature was 210°C, and the screw speed was 495r / min; the SiC / PP composite pellets were injected into standard splines in an injection molding machine, and the injection molding temperature was 240°C. The mechanical properties of the obtained unmodified micro-SiC / PP composites are shown in Table 1. Compared with the pure PP matrix, the flexural strength, flexural modulus, elastic modulus and heat distortion temperature of the unmodified micro-SiC / PP are respectively increased. 14%, 119%, 86%, 14.8%.
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