3. Cleaning Power
Cleaning power is closely correlated to solvent power
which can be indicated by Hildebrandt value, Kauri-Butanol
index and Hansen index, as shown below.
Table 2. Solvent parameters
| |
NPB |
1,1,1-Trichloroethane |
Trichloroe-thylene
|
Dichlorome-thane |
Tetrachloroe-thylene |
Hildebrandt value |
18.2 |
17.4 |
18.8 |
19.8 |
19.0 |
Kauri-Butanol index |
125 |
124 |
129 |
136 |
90 |
Hansen index: Dispersion |
16.0 |
17 |
18.0 |
18.2 |
19.0 |
| Polarity |
6.5 |
4.3 |
3.1 |
6.3 |
6.5 |
| Hydrogen bonds |
4.7 |
2.1 |
5.3 |
6.1 |
2.9 |
Cleaning power under
ambient temperature is tested in the following precedures:
1. Prepare a solution contains 30% of substances to be cleaned.
2. Immerse a weighed steel wool pad in the solution thoroughly.
Take it out and dry at 100°C for 30 minutes.
3. Weigh the steel wool pad and claculate the substances to
be cleaned on the steel wool pad.
4. Put the steel wool pad in a test tube, add 3ml of test
solution, shake well.
5. Take out the steel wool pad, dry at 100°C for 30 minutes,
weigh and calculate the weight loss.
The table below shows the results.
Table 3. Cleaning power (g/ml)
| |
Mineral oil |
Polyester |
Lubricant |
Silicone oil |
| NPB |
0.88 |
1.44 |
0.97 |
1.00 |
| 1,1,1-Trichloroethane |
1.00 |
1.00 |
1.00 |
1.00 |
| Trichloroethylene |
0.82 |
1.25 |
0.59 |
0.95 |
| Tetrachloroethylene |
0.67 |
1.21 |
0.82 |
0.83 |
| Dichloromethane |
1.01 |
0.80 |
0.87 |
0.88 |
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