Page 459 - Handbook of Materials Failure Analysis

3 Results 457

Table 17.3 Pyrolysis Products of Sludge on the Surface of the Compressor
Wall from Car Air Conditioner at 700 °C
Pyrolysis Product Pyrolyzed Material
Retention
Time (RT)
(min)

5.44 Propylene Polypropylene glycol,| SBR
5.54 Acetaldehyde Polypropylene glycol
5.61 1-Butene SBR
5.84 Acetone Polypropylene glycol
6.22 1-Hexene Mineral oil
7.30 Acetic acid anhydride Polypropylene glycol
7.64 Methoxyacetone Polypropylene glycol
8.12 Propylene glycol Polypropylene glycol
9.74 Toluene SBR
10.34 Diisopropyl ether Polypropylene glycol
11.00 Isopropoxy acetone Polypropylene glycol
13.06 Ethylbenzene SBR
14.19 1-Decene Mineral oil
14.40 Styrene SBR
15.93 Cumene SBR
18.72 α-Methylstyrene SBR
19.00 1-Undecene Mineral oil
22.11 Cresol Additive
22.80 1-Dodecene Mineral oil
25.69 1-Tridecene Mineral oil
27.95 1-Tetradecene Mineral oil
29.82 1-Pentadecene Mineral oil
30.11 Undecanal Additive
31.71 2,6-bis-(1,1-dimethylethyl)-4- Additive
methylphenol (BHT)
32.78 1-Hexadecene Mineral oil
33.10 Dodecanal (lauric aldehyde) Additive
49.85 Tri-o-cresyl phosphate Additive
50.85 Tri-p-cresyl phosphate Additive
51.97 Tri-m-cresyl phosphate Additive

polypropylene glycol, mineral oil (paraffin oil), and additives, such as 2,6-bis-(1,1-
dimethylethyl)-4-methylphenol (BHT, antioxidant), undecanal, lauric aldehyde
(antioxidants), and tricresyl phosphate isomers (flame retardant agents). They are
also used as fire-resistant in hydraulic fluids and lubricants [9]. The mass spectrum
of the identified tri-p-cresyl phosphate is shown in Figure 17.10. The obtained ana-
lytical results were then used for troubleshooting with the customer.