| 摘要 |
A fly repellent composition comprises ingredients with high boiling points and low volatility so that the repellent characteristic lasts for many weeks, wherein the composition comprises rosin, also known as pine resin and colophony. Only water and isopropanol may evaporate but the rosin and the other ingredients remain, giving rise to a dried tacky film. The composition is formed by mixing the rosin with a mild alkaline chemical such as triethanolamine or morpholine which allows the final composition to be water soluble and suitable to be sprayed onto surfaces. The composition may further comprise a humectant such as dipropylene glycol, mild odour ingredients such as benzyl alcohol and terpineol, and a dispersant such as Cetomacrogol 1000RTM. |
