ARKEMA 材料

Impact Modification
Non reactive elastomeric polymer + compatibilizer Polyester COOH Non cohesive product -> Poor mechanical properties Non reactive elastomeric polymer (ex : Lotryl) compatibilizer (ex : Lotader) Polyester COOH Cohesive product -> Good mechanical properties
nouvelle norme new standard
ISO 179-93
is o 180
is o179-82
is o179-93
Specimen : 80x10x4mm
Standard : ISO 179-93 1-Injection of the specimen 2-Annealing 16hrs @ 100°C (for PET only) 3-Notched 4-Conditioning : 50%HR / RT / 14 days 5-Impact test
z 1 - Classical method = use LotaderR alone as an impact modifier z 2 – Use Lotader as a compatibilizer + a non reactive polymer (ex: Lotryl) z 3 – Crosslinked dispersed phase (high content, high flexibility and melt strength)
Impact Modification
Polyester-g-Lotader
Lotader AX8900
Elastomeric Polymer = Lotryl
compatibilizer = Polyester-g-Lotader
Hale Waihona Puke Baidu
z1
Polyester COOH
z2
z 1 - Classical method = use LotaderR alone as an impact modifier z 2 – Use Lotader as a compatibilizer + a non reactive elastomer (ex: Lotryl) -> Lotader & Lotryl for heat stability (process temperatures > 240°C) -> High content of co-monomer for Softness (impact resistance) -> Lotader MAH for PA and Lotader GMA for Polyesters
6 5 4 3 2 1
Choc à +23°C (en KJ/M2) Choc à -30°C (en KJ/M2)
+ 16% de Lotader/Lotryl
CPET pur
0 0 2 4 6 8 10 12 14 16
Effect of the Lotader 4720 in PA6
16 14 12 10 8 6 4 2 0 0 10 20 30 40 50 60 70 80 PA6 pur
Impact Modification
Polyester-g-Lotader
Lotader AX8900
Elastomeric Polymer = Lotryl
compatibilizer = Polyester-g-Lotader
z1
Polyester COOH
z2
z3
Dispersed Phase = Crosslinked Lotader(s)
PBT / Lotader AX 8900 (80/20)
PA66 / Lotader 4700 (80/20)
The average particle size is lower than 1 µm
IMPACT TEST : Notched & Unnotched Charpy
izod charpy
OREVAC SOARNOL
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA & Electrical
Plugs, Lighters …
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA & Electrical
Impact Modifiers for Engineering thermoplastics
Alain Bouilloux - BDI - October 2003
Impact Modification
• Objectives To reduce brittle behaviour of engineering polymers such as Polyesters, PA. PET and PBT have good mechanical and thermal properties (flexural modulus etc.) but their main defects are the poor impact resistance at low temperatures (30°C, -40°C) and sensitivity to notch • Solution To disperse homogeneously in small particles an elastomeric polymer (low Tg) in the semi-cristalline Polyester matrix in order to reduce the brittle behavior by a mechanism which absorbs energy and avoids crack propagation
COMPOUNDING CONDITIONS (for PBT)
PBT (as received) Lotryl and/or Lotader Glass Fibers by side Feeder Vacuum
W&P ZSK 40 (L/D=40) Melt temperature : 250-265°C Throughput : 40-80 kg/hr Screw speed : 150-300 rpm Dried before injection : (80°C over night / vaccum)
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA & Automotive
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA & Automotive
EVATANE LOTRYL LOTADER
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds Polyesters : miscellaneous
•
Optical micrograph of 80/20 (wt%) PBT/Lotader AX8900 after Charpy Impact Test failure (notched, 23°C)
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Effect of the impact modifier in CPET
Impact Modification
COOH
Lotader
1
O
O
2
O
compatibilizer = Polyester-g-Lotader Polyester COOH Lotader
compatibilizer
Cohesive product
NH2
O
O
O
O
O
= PA-g-Lotader
PA-NH2
•
The elastomeric polymer is not always miscible and generally not compatible with the polyester matrix. It is necessary to compatibilize using an amphiphilic polymer that acts like a soap for an oil/water mixture
Covers
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA & Electrical
Connectors
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA & Sports
EVATANE LOTRYL LOTADER
Behaviour during impact test of modified PBT (Charpy, Notched)
PBT : Brittle PBT + 20% AX8900 : Ductile
•
Optical micrograph of PBT after Charpy Impact Test failure (notched, 23°C)
PBT : Ultradur B 4500 from BASF
Typical morphologies of a PA and a PBT modified with 20% of Lotader
(Scanning electron microscopy after fracture at low temperature + extraction of the dispersed phase + metallization of the surface + image analysis (particle size distribution))
OREVAC SOARNOL
Compounds PA & Building
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds Polyesters : Electronic
Choc à +23°C (en KJ/M2) Choc à -40°C (en KJ/M2)
+ 20% de 4720 + 15% de 4720 + 10% de Lotader 4720
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Some examples of applications
EVATANE LOTRYL LOTADER
OREVAC SOARNOL
Compounds PA in Automotive Compounds PA in Electrical Compounds PA in Sport Compounds PA in Building Polyesters in Packaging Polyesters in Electronic
•
Nodular structures are formed ‘’in situ’’ during compounding : Example : Polyester-COOH + Lotader GMA -> Polyester-g-Lotader Example : Polyamide-NH2 + Lotader MAH -> Polyester-g-Lotader LOTADER improves interfacial adhesion, reduces interfacial tension and as a consequence reduces the particle size