Water and oil repellency are among the most common functional properties that need to be assessed for protective clothing, both during development and production. There are established techniques for the evaluation of these properties, but they are time consuming. Durability assessment requires washing of the repellent fabric and evaluation of repellency using standard techniques, which requires 2-3 days to reach on a conclusion. In this work a new technique based on contact angle measurement has been evolved that gives an indication of repellency within 2-3 min and durability of repellency within 30 min.
To develop durable flame, water and oil repellent fabrics, a study was undertaken using fluorochemicals as water and oil repellent agents on inherently flame-retardant fibers. The treated samples were leached for 30 and 60 min to evaluate durability of the chemical treatment. The fluorochemical treatments produced durable fabrics that were simultaneously flame retardant and water and oil repellent. The effect of fluorochemicals on the thermal chemistry of inherently flame-retardant fibers was studied using thermogravimetric analysis (TGA). The studies showed that the fluorochemical treatment does not affect the thermal chemistry of the flame-retardant fibers.
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