discoloration resistant lldpe rotomolding resin discoloration resistant... · 1 rotational molding...
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Discoloration Resistant LLDPE Rotomolding Resin
PTT GLOBAL CHEMICAL PLC.
1 1
Rotational Molding Process
Ref: Practical Guide to Rotational Moulding Roy J. Crawford and Mark P. Kearns 2003
2 2
Polyolefin discoloration pathway
3 3
How plastic discolored from “ROTOMOLDING PROCESS”?
• Exhaust gas environment
• Additive formulations
NOX/SOX
Radical
Ref: http://www.ampacet.com/faqs/yellowing-and-pinking-white-pe-pp/
4 4
Exhaust gas environment
5 5
Gas Fading Experiment
Samples Before fading After 96 hs
fading
B + phosphite -0.91 0.28
A + phosphite -1,42 0.87
-2
-1
0
1
B A Y
I valu
es
Formulation
Before fading
96 hrs fading
6 6
Discoloration Mechanism from Additives
Quinone Methine Trap
Yellow Intermediate Yellow Substance
Radical
Colorless irreversible substance
Phenolic AO
7 7
Effect of Quinone Methine Trap amount
formulation Initial YI After aging (210 C 30 min)
VIR 0.04 8.68
FORM A -1.81 13.16
FORM B -1.54 7.83
FORM C -1.41 7.01
FORM D -2.81 4.51
-5
0
5
10
15
VIR
FO
RM
A
FO
RM
B
FO
RM
C
FO
RM
D
YI
Formulations
Initial YI
Aging YI
VIR : LL9641 base resin
Formulation: phenolic, phosphite,UV8 Light stabilizer, Lubricating agent
FORM A, B, C, D (amount of Quinone Methine Trap A<B<C<D)
8 8
Consistency of Compounding
formulation After aging (210 C 30 min)
Replicate I 4.92
Replicate II 4.85
Replicate III 4.51
0 2 4 6 8
10
Replicate I Replicate II Replicate III
YI
Formulations
Aging YI
Aging YI
Sample: phenolic, phosphite, Light stabilizer, Lubricating agent (FORM D)
9
Private & Confidential
Discoloration Resistance Chemistry
UV radiation
Heat & Oxygen
AO1
AO2
LS
Yellow
Intermediate Scavenger
Colorless compound
Yellow Intermediate Yellow Substance
Radical Phenolic AO
10
Private & Confidential
Rotomolding Article from Discoloration Resistance Resin
11 11
Acknowledgement
PTT Global Chemical PLC.
Science an Innovation Center (S&I)
BU-POL, PTTPM, CO-DI-PM Department
Project team (Mr.Wiraphing K, Ms. Patima W. and Ms. Chonticha C.)
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