It can be seen from the table that the three types of calcium carbonate filled foam have a higher volume expansion rate, and the volume expansion rate is close to 7 at a low filling amount (50 parts), but is still high at a high filling (180 parts). At 6, it is shown that the effect of particle size on the foaming rate is not obvious, but also indicates the possibility of high foaming. In addition, it can be seen that the size of the filling volume has a certain influence on the volume expansion factor, and both show a tendency of first falling and then rebounding; on the contrary, the apparent density of the foam shows the tendency of first falling and then rebounding as the filling volume increases. Corresponds to the change in volume expansion rate. Ice Titanium Diode Laser Hair Removal Machine,808 Diode Laser Hair Removal,Hair Removal Epilator Xi'an Double H Health Technology Co., Ltd , https://www.dhextract.com
Looking at the foaming curve of the 400-mesh calcium carbonate filling system, as the time goes by, the degree of cross-linking increases, and the foaming curves of different filling amounts show the characteristic of increased torque. The difference lies in the foams with different filling amounts. The maximum torque reached is different, and the foaming time required to reach the maximum torque varies. This shows that the influence of different filling amounts on the foaming effect is obvious. When the filling amount is 50 parts, the maximum torque value is small, and the required foaming time is also short; when the filling amount is increased to 80, 100, and 120 parts, the maximum torque is still increasing, the required foaming time It is also being continuously extended; however, when the filling amount is as high as 150 or more, the maximum torque value is obviously decreased, 150 corresponding maximum torque values ​​are reduced to corresponding levels of 80 to 100, and the filling amount is as high as 180. The maximum torque value is lower than the 50 parts, and the foaming time is also shorter. The foaming curves of 800 mesh and 2500 mesh calcium carbonate also showed similar characteristics. This phenomenon of different filling amount of foaming curves is worthy of attention.
2.2 The impact of different specifications and amounts of calcium carbonate on the hardness of the foam It can be seen from the experiment that the three specifications of calcium carbonate all show that the hardness of the foam increases first and then decreases with the increase of the filling volume. And the peak size is different. The peak of fine particles is higher. This shows that the three types of calcium carbonate particles have different contributions to the hardness of the foam. The coarser the particles, the more filling required to reach the hardness peak; the finer the particles, the smaller the filling required to reach the hardness peak. Before the peak, the contribution of the fine particles to the hardness is obviously better than that of the coarse particles. After the peak, the finer the particles, the lower the hardness is than the coarse particles.
2.3 Apparent density and volume expansion of foams with different specifications and amounts of calcium carbonate
2.4 Particle Size and Distribution of Three Types of Calcium Carbonate From the analysis of the previous results, it can be seen that the effect of three types of calcium carbonate on the foaming performance clearly shows a close relationship with the filling amount, but unexpectedly it is related to the particle size. The relationship is not significant.
3 Conclusions (1) The foaming curve shows that in a certain filling range, the maximum torque of the foaming curve shows a phenomenon of increasing with the increase of the filling amount, but after exceeding a certain range, the maximum torque is reduced.
(2) Foaming hardness shows that the foams of 400 mesh, 800 mesh and 2500 mesh calcium carbonate all show an increase with the filling amount, and the hardness first increases and then decreases, the hardness has a peak, and the particles have different thicknesses and hardness. The changes depend on the amount of fill.
(3) The change in the volumetric expansion rate of the foams shows that the particles can obtain a higher volumetric expansion ratio in terms of their thickness, and the three sizes of calcium carbonate have a high filling (180 parts) and high foaming (the expansion volume expansion ratio is greater than or equal to 6) The feasibility.
(4) The size and distribution of the particles can indicate that the size of the filler has a significant effect on the foaming performance, but has little relationship with the particle size. (Finish)
Foaming effect of calcium carbonate filled EVA/recycled PE system (below)
2.1 Effect of calcium carbonate with different specifications and different filling capacity on the foaming curve of foams Experiments were carried out with 50, 80, 100, 120, 150 and 180 parts (quality) of different specifications of calcium carbonate for foaming test, with a foaming curve of 400 For example.
Dosage/parts 400800 mesh 2500 mesh Ï/g.cm-3 Volume expansion ratio/times Ï/g.cm-3 Volume expansion ratio/times Ï/g.cm-3 volume expansion ratio/time 500.1307.50.1486.710.1357.39800.1785 .960.1746.090.1676.671000.1915.820.2085.720.1826.421200.2005.350.1986.310.1956.261500.1876.410.1926.340.2155.991800.1806.620.1906.370.2966.31
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