The purpose of this experiment is to find a cleaner for Adhesive Manufacturer that will replace their current 4:1 heptane-toluene mixture. So far, attempts with aqueous cleaners and semi-aqueous terpenes have proven unsuccessful. Various solvents that are safer than the current Adhesive Manufacturer cleaning solution will be tested.
Durotac Adhesive was applied to the 316 stainless steel coupons. Sitting times of the adhesive was between 10 and 15 minutes. Cleaning would be accomplished by first applying some cleaning chemistry (100%) onto the contaminated coupons and allowing to sit for about 30 seconds. The adhesive was then removed with a scouring pad. Time and ease of removal was noted. All chemistries were used at room temperature.
SUBSTRATE MATERIAL: 316 Stainless Steel Coupons
CONTAMINANTS: Duro-Tac toluene-heptane based adhesive CONTAMINATING PROCESS USED: Adhesives applied on with swab and allowed to sit for 10 minutes to 15 minutes
Trial Results:
The cleaners tested and the results are shown in the table below:
Cleaning Chemistry
Time of removal (sec)
Notes
Brulin Corp. Compliance
50
Pretty good removal
AW Chesterton 803 Solvent
70
Ausimont USA Inc Perfluorosolv PFS-1
80
Very tough to remove
Ashland Chemical Co Solvent 6733
DNC
ISP Tech N-Methyl 2-Pyrrolidone
DNC
Solvent Kleene, Inc. Degrease 500
40
Dissolves at first, but leaves a tacky
CSA Inc. Biosafe 1023
35
Not as effective as the 1024
CSA Inc. Biosafe 1024
25
Not much dissolving action, but Adhesive rolls off easily
Bush-Allen-Boake K-312
45
Dissolves but leaves a film that is tough to remove
Dow Development Solvent 40570
65
Surface still quite tacky
Dow Development Solvent 40571
35
Very clean surface
Dow Development Solvent 40579
45
No residue left
Toluene
30
Tacky residue left
Success Rating:
Results successful using TACT (time, agitation, concentration, and temperature, as well as rinsing and drying) and/or other cleaning chemistries examined.
Conclusion:
The Bio-Safe 1023 does a good job of lifting the adhesives. One last experiment will be to try mixtures of the most successful terpenes and aqueous products. Most of the terpenes will dissolve the adhesive to some degree but leave a sticky residue that does not peel off. The aqueous products are just the opposite, they cause no dissolving action, but the adhesive peels off pretty easy after a while. A combination of these traits may be most effective.
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