TM Polymer Additives & Waxes
Hostavin B-CAP
Training Febuary 2007 CONTENT ¾ UV Absorbers : Base requirements ¾ Hostavin B-CAP : Product profile ¾ Interaction of UVA with metal ions ¾ Hostavin B-CAP in PC/PMMA/PET
UV Absorbers : Base requirements for an effective UV Absorber
The more barriers between an object and the environment, the better
Requirements
- High absorptivity in the sensitive UV region - Effective dissipation of the absorbed energy in a non-photosensitizing way - High persistence in the stabilized polymer matrix - Minimal sensitivity to side reactions with / in the matrix
TM Polymer Additives & Waxes
2
1/4-High absorptivity in the sensitive UV region
comparison of different UV-absorbers
UV-C UV-B UV-A visible
UV-A 320-400 nm UV-B 280-320 nm UV-C < 280 nm
absorption
0,8
benzophenone (BZP) benzotriazole (BZT) hal. benzotriazole (hal. BZT)
0,6
0,4
0,2
TM Polymer Additives & Waxes
250
275
300斗齿
3
325 350 375 wave length [ nm ]
400
425
1/4-High absorptivity in the sensitive UV region
田文镜POLYMER ABBREVIATION POLYMER MAX. ABSORPTION [ nm ] POLYMER MAX. SENSITIVITY [ nm ]
UV-A 320-400 nm UV-B 280-320 nm UV-C < 280 nmtm2007
PC PMMA PET
~ 260 < 240 ~ 290
Absorption spectrum of Hostavin B-CAP
295 315 290, 320
1
Solvent : Dioxan Cell : 1.0 cm Concentration : 10,16 mg/L
0,5
0
TM Polymer Additives & Waxes
220
245
270
295
320
345
370
395
4
Wavelength (nm)
2/4-Effective dissipation of the absorbed energy
- in a non-photosensitizing way - inherent light stability of the UV absorber molecule itself
O C
H
O
hν
H
O
∆E
OR OR
Hydroxy-Benzophenon石家庄化肥厂
TM Polymer Additives & Waxes
5
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