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To identify possible alternatives to acetone for adhesive removal
Nine products were selected from the lab's database of alternative cleaning products based on client input. Six semi-aqueous and three aqueous products were chosen for evaluation. An additional product was supplied by the client. The aqueous products were diluted to 10% using DI water in 600 ml beakers. All ten products were heated to 130 F on a hot plate.
Thirty preweighed coupons were coated with Bob Smith Industries Insta-Cure adhesive (7085-85-0) and then sprayed with the Insta-Set (64742-89-8, 99-97-8) and allowed to sit for 10 minutes at room temperature. After drying, the coupons were weighed a second time.
Three coupons were placed in each beaker and allowed to sit for 10 minutes, then rinsed in tap water at 120 F for 10 seconds and dried with a Master Appliance heat gun at 500 F for 10 seconds. A third weighing was taken and efficiencies were calculated.
The same coupons were placed back into the cleaning products and soaked for an additional 50 minutes. At the end of the hour, coupons were rinsed, dried and weighed again. Final efficiencies were recorded.
The client supplied product and DuPont's DBE performed similarly, causing the adhesive to become soft and liquefied. Both products are ester based. The International Products Surface Cleanse 930 was found to cause the adhesive to lift off the metal surface in one big stiff piece. The US Polychemical Co Polyspray Jet 790 XS had similar results after the 60 minutes of cleaning. Two products, Westech 1050 and RST-5 attacked the aluminum coupons.
The 10 minute cleaning results are listed in Table 1.
|Cleaner||Coupon 1||Coupon 2||Coupon 3||Average||Std Dev||Observations|
|Bio T Max||-0.33||3.79||1.65||1.70||2.06|
|Westec 1050||-93.88||-77.00||-75.24||-82.04||10.29||Attacked aluminum|
|Surface Cleanse||0.47||-10.35||-17.15||-9.01||8.89||wipe/peel off|
|Bio T Max||0.61||3.58||0.67||1.62||1.69|
After cleaning for an hour, little improvement was observed for most of the products.
Table 2. Cleaning Efficiencies @ 60 Minutes
|Cleaner||Coupon 1||Coupon 2||Coupon 3||Average||Std Dev||Observation|
|Bio T 200 A||0.04||3.35||1.51||1.63||1.66|
|RST-5||21.37||109.68||114.16||81.74||52.33||2/3 peeled but attacked metal|
|Surface Cleanse||92.67||97.18||94.40||94.75||2.27||3/3 peeled|
|Bio T Max||0.25||4.48||1.55||2.09||2.17|
Success Rating:Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Surface Cleanse 930 will be used in attempt to remove the film from the metal part.