Transcript Presentation Title

Sewer renovation
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Cure formulations
RELINING
The cure process
Important items:
1. Reactivity of the formulation
2.Shelf life of the catalyzed resin
3. Shelf life of the impregnated felt
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The cure proces
- Felt pressed against the wall:
►The geltime should be as fast as possible
to prevent sacking.
-Total cure of the felt
► Water temp. at least 80ºC
► Post cure time 2 up to 4 hrs.
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04
Relining curing system
Related to the cure temperature a double peroxide system is needed:
► A kicker for the geltime
► An efficient peroxide for the total cure
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Activation temperature peroxides
Cure system
1 phr Perkadox 16
1 phr Trigonox 233
1 phr Trigonox 21
2 phr Perkadox CH-50X
2 phr Trigonox 22-C50
1 phr Trigonox C
1 phr Trigonox C +
1 phr Accelerator NL-49P (1% Cobalt)
1 phr Trigonox 93 +
1phr Accelerator NL-49P (1% Cobalt)
Activation
temperature
Tact (oC)
40
50
60
70
70
80
70
60
The process temperature should be at least 30ºC higher
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Kicker peroxides
Perkadox 16
peroxydicarbonate
• Activation temperature 40ºC. (long shelf-life)
Trigonox 233
methyl iso butyl ketone peroxide
• Activation temperature 50ºC. ( too short potlife)
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Finishing peroxides
Trigonox C
perester
Trigonox 42
perester
• Activation temperature 80ºC. (plus Cobalt 70ºC.)
Trigonox 117
percarbonate
Trigonox BPIC-C75
percarbonate
• Activation temperature 80ºC.
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PERKADOX 16
Advantages:
►Most reactive peroxide for Relining
Activation temp. 40ºC
►Shelf life in resin (20ºC) 2 up to 6 days
Disadvantage:
►Temp. Controlled transport and storage
Max. 20ºC
►Is a powder, solubiliy in resin difficult
Solution: Perkadox 16 paste
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Perkadox CH-50X
Advantage:
- Long shelf-life >20 days
- Good solubility
Disadvantage:
- Activation temp. too high
- Heating temp. Minimal 110º
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TRIGONOX C
Advantage:
- very efficient
- very stable
Working conditions:
Activation temperature 80°C
+ Accelerator
70°C
- Shelf-life 56 days
- Shelf-life 17 days
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Relining Peroxide formulation
Kicker peroxide:
- Perkadox 16
-
0.8 – 1.0 phr.
Efficient peroxide:
- Trigonox C
- 1.0 phr.
- Trigonox 42S
Including Cobalt:
- Accelerator NL53 - 0.1 phr
Potlife of this system is 2 up to 4 days
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