Environmentally Friendly Alternates to Chemlok 233 Adhesive Cement

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Busch, Madeline M
adhesive; cement; UTC; aerospace; Chemlok; de-icer; Other Aerospace Engineering; Other Chemical Engineering
project description
The purpose of this project was to determine and qualify suitable, environmentally friendly replacement(s) for the current Chemlok 233 adhesive cement used by UTC Aerospace. Chemlok 233 was discontinued by the manufacturer based on the availability of a hazardous solvent (Trichloroethylene – TCE). The Chemlok 233 Control and four Experimental alternates with similar properties were lab tested for adhesion strength in various UTC proprietary cement specifications. The specifications modeled Chemlok’s uses in the construction of pneumatic de-icers. Chemlok 2332 was selected for use in Cement A, and Chemlok 402 was chosen for use in Cement B based on their highest average adhesion values of 30.0 lbf/in and 25.1 lbf/in, respectively. Ten Experimental de-icers (containing Chemlok 2332 and Chemlok 402 in Cements A and B) performed equally in flex testing – inflation with air in cycles until failure/burst – compared to ten Control de-icers (containing Chemlok 233). All failures were unrelated to the use of Chemlok, and Chemloks 2332 and 402 showed acceptable performance in Cements A and B. Chemlok 2332 (less hazardous without trichloroethylene) and Chemlok 402 performed equivalently to Chemlok 233 in adhesion and de-icer flex testing, qualifying Chemloks 2332 and 402 for replacement in UTC Cements A and B, respectively.