Transcript Fluoropolymeres

Fluoropolymeres - Basis of our Products
Fluoropolymeres
 Material properties
 Resistance to chemicals
 Surface condition
 Purity (Leaching)
 Permeation
 PTFE
 TFM-PTFE
 PFA
Fluoropolymeres
 Outstandig chemical stability
 Service temperatures up to 260°C
 Extremely anti-adhesive, smooth surface
 Ultra-high purity
 Superior electrical insulator
 Hydro-phobic
Fluoropolymeres - Material Properties
PP
-
CH3
CH2-CH
-
PTFE
Fluorine
n
Carbon
-[CH2-CF2]n-
PVDF
TFM
PTFE
Fluorine
-[CF2-CF2]n-
CF3
TFM
-
Oxygen
(CF2)2
Carbon
O
(CF2)4 -CF- (CF2)5
CF3
PFA
-
(CF2)2
PFA
Fluorine
-
O
(CF2)2-CF- CF2
n
n
Oxygen
Composition and Poperties of PTFE
 Perfluorinated plastic with melting point of 327 °C, molecular weight
approx. 108 g/mol
 Complete protection of C-C-bonds by F-atoms
 Processable by pressing, sintering and chip removing technics
 Nearly universal resistance to chemicals
 Service temperature: - 250 °C to + 250 °C
 High purity, excellent dielectrical properties
 No embrittlement, no aging
Composition and Poperties of modified PTFE: TFM-PTFE
 Molecular weight is about 1/5 of the molecular weight of PTFE
 Contains the same perfluorinated modifier as PFA, but less than 1 %
 Therefore TFM-PTFE closes the cap between classical PTFE and PFA
 Weldable by special technics, thanks to the „shift versus thermoplastic
properties“
 Cold-flow, pore content and stretch-void-index are improved
Composition and Poperties of PFA
 Thermoplastic processable perfluorinated polymere
 Molecular weight approx. 1 % of PTFE, therfore processable by fusion
 4 to 10 % modifier
 melting point: 305 to 290°C
 Highly modified  highly amorph: high transparency, improved alternate
bending and good chemical resistance to stress crack
 Chemical stability and service temperature comparable with PTFE
 Processing methods: injection molding, extrusion, transfer molding
 Thermoplastic processing technics open up new applications for this „material
with PTFE-properties“
Fluoropolymeres - Material Properties
temperature range [°C]
persistence to chemicals
PTFE
TFM
PFA
PVDF
- 250
- 250
- 250
-60
to
to
to
to
+ 250
+ 250
+ 250
+ 150
very high
very high
very high
high; reacts with
strong bases (NH3)
molecular weight
tensile strength
(ISO 12 086)
~ 108 g/mol
2 x 107 g/mol
20 - 40 N/mm2
41 N/mm2
106 g/mol
15 - 30 N/mm2 40 - 60 N/mm2
Fluoropolymeres - Resistance to Chemicals
Chemical
Effect
fluorinated hydrocarbons
swelling, reversible at short-term exposition
alkali metals, dissolved or molten
elimination of fluorine and polymere decomposition
halogenes, elemental fluorine, chloro trifluoride
chem. reaction possible at elevated temperatures,
material decomposition, possibly violent reaction
nitrating acid (H2SO4 / HNO3)
above 100°C slow material decomposition,
carbonisation
monomeres: styrene, butadiene, acrylnitrile ...
could penetrate into the material; at spontanous
polymerisation: swelling or polymere decomposition.
popcorn-effect
high-energy radiation
-radiation: dose of 10kGy could reduce the
mechanical properties by more than 50%
Fluoropolymeres - Surface Condition
Chip removing production
without polishing
PTFE
TFM
Injection molding
PFA
Fluoropolymeres - Purity (Leaching of Fluoropolymeres)
Extraction time:
Medium:
Temperature:
Result:
2 days
2% HNO3
20 °C
ng/cm2
Mg
Al
Li
B
F
Na
P
S
Cl
K
Ca
Cr
Mn
Fe
Ni
Cu
Zn
Br
Mo
Pb
PTFE
TFM
PFA-HP
2,58
3,73
< 0,0002
0,085
1173
18,10
<4
598
21
18,40
21,90
0,085
0,098
5,04
0,63
21,4
6,43
4
0,31
2,52
1,40
2,20
< 0,0002
0,091
1320
10,00
<4
500
21
10,00
11,00
0,10
< 0,002
3,10
0,38
24,3
4,00
4
0,061
1,80
1,18
5,00
< 0,002
< 0,01
3522
5,38
<5
1164
27
5,32
14,00
0,19
< 0,002
2,97
< 0,003
0,049
1,23
5
< 0,001
0,33
Fluoropolymeres - Purity (Leaching of PTFE-TFM)
ppb 40
37,0
36,0
35
30
2 % HNO3
25
49 % HF
20
DI Wasser
14,5
15
13,0
9,5
9,0
10
7,2
6,0
5,7
4,8
3,8
5
1,44
< 1,5
< 2,9
< 1,5
< 0,6
< 0,9
n.d.*
0
Na
Al
Conditions:
Mg
Cu
Cr
Fe
Conclusion:
 2 mm plate material
 Purity in accordance with specification for PFA-HP
 2% HNO3, 49% HF : 20 °C, 7 days
 lower concentrations of Cr, Ni, Mo than in PFA-HP
 DI water
80°C, 7 days
Fluoropolymeres - Permeation
cm³
m²·day·bar
 Permeation of HCl-Gas at 100°C
2000
1500
PTFE
TFM
1000
Permeation in
PFA
500
0
0
2000
4000
6000
8000
Thickness in µm
10000
Fluoropolymeres - Permeation
Permeation in
cm³
m²·day·bar
 Permeation of water vapour at 100°C
25,00
20,00
PTFE
15,00
TFM
PFA
10,00
5,00
0,00
0
1000
2000
3000
4000
5000
6000
7000
Thickness in µm
8000
9000
Your Benefit
 Hiogh competence through in house production
 Customized solutions possible
 PTFE and TFM-PTFE comparable with PFA
 Solid, longevity PTFE-TFM-products (inserts, pressure vessels etc.)