INCREASING EFECTIVITY OF SILIKA (SiO2) DEFOAMER BY COATED ON HDPE (HIGH DENSITY POLYETHYLENE)

• Main Author: EVITA (NIM: 20207070), MARIA
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/12356
• Institution: Institut Teknologi Bandung

A silica-HDPE defoamer, i.e. silica (SiO2) coated on HDPE (High Density Polyethylene) grains, was fabricated at a temperature an the range of 70-100 oC. The diameter of silica was 18 nm as analyzed by using XRD (X-ray Diffraction) while the average weight of silica on HDPE was 50.51 mass % as determined by employing EDX (Electron Dispersive X-ray). The foam to be reduced was made from detergent. As a control, a pure silica defoamer i.e. silica that was not coated on HDPE grains was utilized. There were increasing effectivity of silica defoamer that wasn't coated on HDPE grains when it was coated on HDPE grains. This defoamer effectivity could be seen when it reduced foam after 5 minutes the defoamer has been immersed to the foam. In 0.6% detergent concentration, silica that wasn't coated on HDPE grains remained 5-45% foam after 5 minutes, while silica that coated on HDPE grains remained 0-25%. In 2.3% detergent concentration, silica that wasn't coated on HDPE grains remained 5-54% foam, while silica that coated on HDPE grains remained 0-42%. In 35.6% detergent concentration, silica that wasn't coated on HDPE grains remained 40-86% foam, while silica that coated on HDPE grains remained 0-50%. The highest increasing effectivity was reached by silica 0.02% in foam. After it has been used as defoamer, 0.27% silica was dispersed in the solution. This was confirmed by absorbance analysis result of UV-VIS (Ultraviolet-Visible) measurement. <br />