Ft0 of the hottest plastic wood composite componen

2022-08-05
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Composition of plastic wood composite (ft

2.2 color material analysis

it can be seen from Figure 3 that the absorption peak at 2920.48cm-1 is the asymmetric stretching vibration of methylene CH2, the symmetric stretching vibration of methylene CH2 at 2849.46cm-1, the deformation vibration of methylene ch at 1465.09cm-1, and the in-plane rocking vibration of methylene CH2 at 721.97cm-1. Therefore, we can confirm the existence of polyethylene component, and there is no splitting at 730cm-1 - 720cm-1 Peak. It can be seen from the DSC diagram of color material in Figure 4 that there is a sharp peak at 133.5 ℃, so it can be concluded that the polyethylene is high density polyethylene (HDPE)

from the analysis in Figure 3, it can be seen that in 1725, the absorption peak has been generated at 87cm-1 since it was first discovered in 2004, which is exactly the result of carbonyl, the absorption peak of ether bond at 1257.38cm-1, and the absorption peak of peroxide at 874.85cm-1. Therefore, it can be considered that the properties of polyethylene in the measured plastics have changed, that is, most of them have been oxidized. This is because the ultraviolet radiation on polyethylene in the air causes the absorption of oxygen and the formation of carbonyl, and the presence of carbonyl will accelerate the photooxidation reaction. The photooxidation will also cause polyethylene to produce an absorption band at 1250cm-1 - 1170cm-1, which is an ether bond Heat also has an important impact on the oxidation of polyethylene. After thermal oxidation, polyethylene generates ketones and a small amount of esters. The resulting peroxy radicals may react with vinyl and cause crosslinking, which is the reason why plastics harden after aging. In Fig. 4, several weak thermal melting peaks were also generated at 98.3 ℃ in the DSC diagram of color material and near the back, which is the melting point of polyethylene oxidation products

the strong and wide absorption peak at 1110.47cm-1 in Figure 3 is caused by the stretching vibration of S-0 bond. In addition, there are absorption peaks at 463.20cm-1 and 800cm-1. Therefore, it can be concluded that there is amorphous silicon dioxide, which is an inorganic filler often used in plastic production. The absorption peak at 614.32cm-1 is caused by cuprous oxide powder, which may be related to the recycled plastics tested

it can be seen that the main component of the color material is high-density polyethylene (oxidized), with a small amount of inorganic filler silica in the middle, and a small amount of impurity cuprous oxide mixed in

3 conclusion

in the production process of plastic wood composites, the quality of recycled plastic sorting is directly related to the molding shrinkage: 0.3-0.8% and the performance of the final product. Therefore, it is necessary to strengthen the management and screening of raw materials sent to the family at the initial stage of production. It is necessary to understand the components of raw materials and the changes in each process of recycling and storage, so as to provide effective help to improve product quality, So as to make enterprises more competitive in the market

(author/sunzhanying, Li zuozu, gejinding, Jiansheng)

Chinese and foreign packaging and printing

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