Study on Environmental Protection of Superfine Calcium Carbonate Burnable PE Masterbatch

3 Results and Discussion

3.1 The mechanical properties of incinerated PE film

From the test results of the mechanical properties of the incinerateable PE film, it can be seen that the mechanical properties of the incineratable PE film meet the national standards and local standards, that is, the use performance meets the requirements of national or local standards (see Table 1).

3.2 Initial degradation performance of incinerated PE film

After the general waste bags and plastic products are used and discarded, they are all exposed for a period of time. During this period, the calcium carbonate-containing film will undergo degradation behavior, that is, the polymer macromolecular chain breaks with the generation of dialyl groups. Experiments have shown that With the extension of sunshine time or the increase of calcium carbonate content, the dial index CI has gradually increased. Table 2 shows the photodegradation performance of different PE films

From Table 2, it can be seen that when the decay period is reached (CI ≥ 6), the illumination time of ordinary PE film, photodegradable PE film, and incinerated PE film (containing 30% CaCO3) is 12d, 7d, and 6d, respectively; At the time (CI ≥ 45), the ordinary PE film, photodegradable PE film, and incinerated PE film (containing 30% CaCO3 light irradiation time were 55d, 40d, and 35d, respectively. It can be seen that the photodegradability of the incinerateable PE film is lower than that of the ordinary light. Degradation of PE film is good, so it seems that the large amount of calcium carbonate in the PE film filling, the film can have an initial degradation, so that the film can be thermally degraded in the same temperature, thermal decomposition, laid for the later full combustion The foundation.

3.3 Incineration performance of burnable PE film

Figure 1 is a thermogravimetric analysis of different PE films. As can be seen from Figure 1, the weight loss temperatures of the incinerateable PE film, the photodegradable PE film, and the ordinary PE film are 260°C, 300°C, and 360°C, respectively; the rapid decomposition temperatures at the beginning are 410°C, 430°C, and 440°C, respectively. Decomposition temperatures were 480°C, 480°C, and 490°C, respectively. It can be seen that the incinerateable PE film is significantly more easily decomposed than other PE films by heat, which is advantageous to the incineration of the film.

This is because the polyolefin containing a large amount of calcium carbonate (>30%) will expand due to the presence of inorganic substances in the combustion process to form many fine pores, unlike the pure plastic, which is prone to melt sintering. This is equivalent to an increase in the reaction area of ​​the combustion, increased the flux of 02, CO2, H20 and other substances, making the combustion more thorough.

(to be continued)