Siloxane Enhanced Elastomer (SiE) Technology

Transcription

1 Siloxane Enhanced Elastomer (SiE) Technology Ted Hays Multibase, A Dow Corning Company

2 SiE Elastomers SiE Siloxane Enhanced Additional features and benefits achieved through the combination of Elastomers and Siloxane Multibase has commercialized SiE technology by using a combination a various synthetic thermoplastic elastomers and siloxane This study offers a comparison of properties and performance of SiE and a standard TPE (SEBS based)

3 Important Aspects: 30 to 80 shore A Excellent appearance Lower CoF Smooth touch Excellent flow No blooming Reduced noise SiE Applications

4 SiE Products Ultra low COF SiE TPE is self lubricating MF SiE A 3309 CS Extended Durability SiE Longer cycling ability MF SiE A 4013 CU1 Non-stick SiE Mold release improvement MF SiE A 8508 EU1 MR SiE Improved mar and scratch/touch and feel Automotive MF SiE A 6009 MU MF SiE A 7009 MU MF SiE A 8009 MU

5 Mar/Scratch Resistant SiE Properties Value Test Method 8009 MU MU MU5 Unit Melt Flow (230oC, 2.16 kg) ISO g/10min Spiral Flow Internal cm Specific Gravity ISO Tensile Strength ISO MPa Tensile Stress at 100% Elongation ISO MPa Elongation at Break ISO % Tear Strength ISO kn/m Hardness (15 sec) ISO Shore A There is a range of hardness from 60 to 80 shore A Although the MFI is low,

6 Shear Rate Curve SiE Materials have excellent flow under high shear conditions

7 Adhesion to Polypropylene Grade MF SiE A 6009 MU Peak Load 70 lbs T-bar peel test at 12 in/min, bond area ~1 square in. SiE Materials have good adhesion to Olefin substrates. Failure mode is adhesive.

8 Coefficient of Friction Performance Sample CoF Static Kinetic Control TPE MF SiE A 6009 MU % Reduction 45% 29% SiE technology is able achieve a lower Static and Kinetic Coefficient of Friction contributing to a silky touch and feel (non-tacky)

9 Scratch Resistance Control TPE SiE 10N 7N 6N 3N 2N 10N 7N 6N 3N 2N SiE technology is able to out perform the control TPE in mar resistance

10 Scratch Resistance - Whitening Control TPE SiE 10N 7N 6N 3N 2N 10N 7N 6N 3N 2N SiE technology is able to almost eliminate scratch whitening all the way up to at least 10N

11 Abrasion Resistance Sample Gloss Before Gloss After % Gloss Loss Control TPE % MF SiE A 6009 MU % SiE technology is able to maintain gloss better than the control TPE significantly reducing the scratch visibility

12 Abrasion Resistance Weight Loss Sample Original Weight, g Cycles Weight After, g % wieght loss Control TPE , MF SiE A 6009 MU , SiE technology is able to far exceed abrasion resistance of the control TPE Only 40 mg weight loss for SiE!

13 Compression Set Performance 22 hr Compression Set Comparison of SiE and TPE Log. (6009) Log. (7009) Log. (8009) C 70C 100C 125C SiE technology is able to maintain a low compression set even at 125C allowing a finger nail mark to be less noticeable

14 Fogging Performance Sample Fog # Microscopic Examination 40X MF SiE A 6009 MU 16 hour 110 C 91.7 No Droplets or Crystals MF SiE A 7009 MU 16 hour 95 C 90.8 No Droplets or Crystals 110 C 77.9 No Droplets or Crystals MF SiE A 8009 MU 16 hour 110 C 91.2 No Droplets or Crystals Testing Conditions: Fogging (LP463DB-12-01, 6h at 95C and 110C heating, 21C cooling, 16 h post SiE technology is able to maintain fogging requirements even at 110C

15 Mold Shrinkage Post Shrink Post Shrink Grade Mold Shrink (2 hrs at 110 o C) (6 hrs at 80 o C) MF SiE A 6009 MU 1.7% 2.8% 2.3% MF SiE A 7009 MU 1.6% 2.3% 1.9% MF SiE A 8009 MU 1.5% 2.0% 1.8%

16 SiE Gas Fading Performance Control TPE SiE A 6009 Before After Before After Sample Gas Fading / Resistance to Burnt Gas Delta E AATCC rating Control TPE Severe color change MF SiE A 6009 MU Slight color change MF SiE A 8009 MU Slight color change SiE technology is able to maintain excellent gas fading - pinking resistance allowing color stability in stagnant environments

17 Flammability Performance FM VSS 302 Grade Time (sec) Burn Rate (in/min) Pass/Fail MF SiE A 8009 MU Pass MF SiE A 7009 MU Pass MF SiE A 6009 MU Pass SiE Materials meet FM VSS 302

18 Soiling and Linting Performance Linting (LP-463KB-38-01) Grade Lint Rentention Rating Pass/Fail (2 min.) MF SiE A 6009 MU 1 Pass MF SiE A 7009 MU 1 Pass MF SiE A 8009 MU 1 Pass Standard TPE 1 Pass Cleanability (LP-463KC-04-01) Grade Soil MF SiE A 8009 MU MF SiE A 6009 MU Standard TPE -IPA no stain no stain no stain -Armor All no stain no stain no stain -Grease no stain no stain no stain -Ketchup stains stains stains -Orange Juice no stain no stain no stain -Coffee no stain no stain no stain -Chocolate no stain no stain no stain -Windex no stain no stain no stain

19 SiE UV Resistance Testing completed using SAE J kj Delta L Delta a Delta b Delta E MF SiE A 6009 MU MF SiE A 7009 MU UV passes standards without issue

20 SiE Oil Bleed Out Tested using SAE J1885 and monitored the plaques daily for oil/tackiness 2 days 4 days 1 week 3 weeks MF SiE A 6009 MU dry dry dry dry There is no exudation or tackiness with the SiE material No blooming / chalking was observed

21 SiE Oil Resistance Before: After: Paraffin oil rested on part at 80 C for 24hrs Part was found to be slightly effected but acceptable No adhesion failure and grain was not washed out

22 SiE Cocoamide Resistance Plaques were exposed to the cocoamide 48 hrs at 23C, 50% RH and then were abraded with a cloth (TSM5100G color fastness to wet crocking). Rating 1 indicates that there was no noticeable change in the grain of the plaques. Cocoamide resistance Grade Rating Pass/Fail MF SiE A 7009 MU 1 Pass MF SiE A 8009 MU 1 Pass Standard TPE 4 Fail

23 SiE Heat Aging MF SiE A 7009 MU5 DX9 Black 40h 1008h at 110캜 Unit Unit Hardness 15s ISO Shore A 7.1 % Tensile strength ISO MPa 8.9 % Elongation at break ISO % -9.5 % Tear strength ISO kn/m 6.6 %

24 Tooling recommendations Very small gates Round mm to 1.5 mm Sub gate into a non visible area or tab that leads into the part Soft shot thickness 2.0 mm to 3.0 mm Minimum thickness feasible 1.5 mm (small parts) Estimated flow length for best possible appearance Distance between gates 150 mm Flow length 300 mm Use valve gates Venting to Preferred - an overflow channel in a non-visible area Good tool temperature control Cycle time is about sec

25 Concluding Remarks Siloxane enhanced elastomers (SiE) have superior scratch resistance as compared to standard TPEs and are designed specifically for car interior trim applications (meets stringent UV, fogging, gas fading requirements)