Thermal insulation performance of pvc film
The total solar transmittance (SHGC) refers to the indoor heat gained through the solar radiation of the transparent enclosure (doors and windows or transparent curtain walls) and the solar radiation projected on the outer surface of the transparent enclosure (doors, windows or transparent curtain walls) The ratio of the amount.
The influence of the amount of dispersant K-61 in the slurry on the total solar transmittance of the PVC film. When the grinding time is 72h (1#～4#), the amount of dispersant K-61 in the slurry is negatively correlated with the total solar transmittance of the PVC film; when the amount of K-61 reaches 4%, the PVC film The total transmittance of solar energy reaches the minimum value of 0.531, which is 11.8% lower than 0.602 when 1% is added. When the grinding time is 4h, the total solar transmittance of the PVC film prepared by the 5# and 6# slurries also decreases with the increase of the dispersant content. It shows that the content of dispersant increases, the solar energy penetrating the film into the room decreases, and the heat insulation effect is better. Solar energy is composed of 53% infrared rays and 3% ultraviolet rays. The experimental results of 2.1 and 2.2 show that the content of dispersant is positively correlated with the infrared blocking rate and ultraviolet blocking rate of the PVC film. Therefore, the solar energy of the PVC film increases with the content of the dispersant. The experimental results of reduced total transmittance are consistent with the results of infrared blocking and ultraviolet blocking experiments. Because the grinding time of 5# and 6# is relatively short, the size of the particles of cesium tungsten bronze is not ideally reduced, which affects the dispersion and stability of the slurry. Therefore, the total solar transmission of the PVC film prepared by them is compared with 4# Big.
The insulation performance test of the PVC film is carried out with a thermal insulation film tester. Figure 6 shows the PVC film prepared by adding slurries with different dispersant contents to test the temperature rise after 1 minute of irradiation with a heat insulation film temperature tester. When no slurry is added, the temperature difference of the blank PVC to the photo is 19.5℃; for the 1#～4# slurry that is grinded for 72 hours, the PVC film is prepared with it. As the content of K-61 in the slurry increases, the temperature difference gradually decreases. When the content of 61 in the slurry is 4%, the temperature difference reaches the minimum value of 6.3°C, which is 14.9% lower than that of 1# slurry (K-61 contains 1% in the slurry and the temperature difference is 7.4°C). Under the condition of 4h grinding time, when the content of K-61 in the slurry increases from 5% to 6%, the temperature difference is 6.9℃ and 6.7℃ respectively, and the temperature difference also shows a downward trend with the increase of dispersant content. The temperature difference between 5# and 6# is slightly larger than that of 4#, which may be related to the shorter grinding time and the lack of optimal dispersion.
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