Preparation method of PET wood-plastic composite material
A technology of wood-plastic composite materials and mixed materials, which is applied in the field of composite materials, can solve the problems of high melting temperature and limit the production and application of PET wood-plastic composite materials, and achieve the effects of good mechanical properties, strong designability and light weight
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Embodiment 1
[0038] Prepare modified wood flour as follows: take straw powder with a particle size of 170 μm to 190 μm, dry it by heat treatment at 100°C, then extract it with acetone, and dry it for later use; add water to dilute the thermosetting phenolic resin, add the above wood powder, and the weight of the wood powder It is 0.8 times the weight of thermosetting phenolic resin, sonicated in an ultrasonic cleaner at room temperature for 30 minutes, then centrifuged and filtered at a centrifugal speed of 1200r / min for 5 minutes, and the centrifuged filtrate was heat-treated at 128°C for 45 minutes to obtain modified wood pink. Take three parts of the obtained modified wood flour, heat them up to 250°C, 350°C, and 600°C in a high-purity nitrogen atmosphere of 100mL / min, and keep them warm for 30 minutes for pyrolysis. The residual carbon rate is 85.9% and 78.3% respectively. , 64.1%.
Embodiment 2
[0040] Prepare modified wood powder according to the following method: take poplar wood powder with a particle size of 170 μm to 190 μm, dry it by heat treatment at 105 ° C, then extract it with acetone, and dry it for later use; add water to dilute the thermosetting phenolic resin, add the above wood powder, wood powder The weight is 0.8 times the weight of the thermosetting phenolic resin. Ultrasonic at room temperature for 30 minutes in an ultrasonic cleaner, and then centrifugally filtered at a centrifugal speed of 1200r / min for 5 minutes. wood flour. Take three parts of the obtained modified wood flour, heat them up to 250°C, 350°C, and 600°C in a high-purity nitrogen atmosphere of 100mL / min, and keep them warm for 30 minutes for pyrolysis. The residual carbon rate is 87.5% and 76.1% respectively. , 63.5%.
Embodiment 3
[0042] The PET wood-plastic composite material of the present invention is prepared by the following method: the PET resin is dried at 125° C. for 4 hours to form a foaming raw material, and the obtained foaming raw material is uniformly mixed with a nucleating agent to obtain a mixture for subsequent use; The obtained modified wood flour, coupling agent, and sodium carboxymethylcellulose were treated in a high-speed mixer for 35 minutes, and mixed with the aforementioned mixture at 73°C to obtain a mixed material, and then foaming agent and plasticizer were added, and mixed evenly , kneading in a double-roller mill, the kneading temperature is 248°C, the kneaded material is lowered and cooled to obtain a composite material sheet, and then mixed with the PET foam sheet at a temperature of 250°C and a pressure of 9MPa. Thermocompression forming, in which, the PET foam sheet is in the middle layer, and the composite sheet is in the upper and lower layers. The finally measured pe...
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