Silane Enabling Broad Formulation Latitude/ Processing of Tread Compounds

Transcription

1 Silane Enabling Broad Formulation Latitude/ Processing of Tread Compounds Copyright 2018 Momentive Performance Materials Inc. All rights reserved. Yemi Adepetun New Product Development Scientist Aaron Ryba Staff Scientist September

2 Introduction Tire Manufacturers Face Difficult Rubber Compounding Challenges Driven by Worldwide Tire Labeling Regulations Europe United States Japan South Korea Difficult to Manufacture Silica Compounds: High Functional SSBR Loadings (60+ phr) High Surface Area Silicas (200+ BET) High Silica Loadings (70+ phr) 2 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

3 Process and Property Improvements Typical Benefits of NXT* Silane: Improved Processing Indicators: Mooney Viscosity, Garvey Die Reduced Payne Effect Improved Rolling Resistance Indicators: Tan d at 60 C, Reb 70 C Compounds containing: 80 phr f-ssbr 70 phr Silica (BET = 215 m 2 /g) Various silanes 3 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

4 Silanes Used in This Study TESPD (S2) silane TESPT (S4) silane NXT* silane 4 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

5 Model Compound Formulations Step Ingredients S4 S2 NXT* Silane f-ssbr (a) BR (b) Experiment and Targets MB1 FM Silica (c) (BET 215 g/m2) Carbon Black N TESPT TESPD NXT Silane Process il Process Aid (d) MC Wax PPD (e) Zn Stearic Acid CBS DPG Sulfur Total Sulfur Atoms, Compare NXT* silane to TESPT (S4) and TESPD (S2) at a 10% of silica by weight loading Vary sulfur levels to achieve equivalent theoretical sulfur content (a) JSR HPR850 : A solution SBR was obtained from JSR (b) Karbochem Neodene 40 polymer: A non-oil extended solution high cis 1,4 polybutadiene polymer produced with neodymium catalyst was obtained from Karbochem (c) Zeosil 200 MP : A highly dispersible precipitated silica, with BET of 215 m 2 /g was obtained from Solvay (d) Struktol A60 : A Mixture of zinc soaps and high molecular weight fatty acids (e) 6PPD: N-(1,3-dimethybutyl)-N'-phenyl-p-phenylenediamine Product formulations are included as illustrative examples only. Momentive makes no representation or warranty of any kind with respect to any such formulations, including, without limitations, concerning the efficacy or safety of any product manufactured using such formulations. 5 Trademarks of their respective owners. Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

6 Mixing Conditions 1.6 L Tangential Mixer, FF = 71% Time/Temp RPM Step MB sec 75 Add polymers 40 sec 75 ½ silica and all silane 100 C 75 ½ silica and all chem 128 C 50 CB and oil 135 C 75 Ram raise 150 C Var Tempering for 90 sec Drop MB2 0 sec 75 Add NP1 125 C 75 Ram raise 150 C Var Tempering for 90 sec Drop PR 0 sec 45 Add NP2 and chem 105 C 45 Drop Mixing Conditions All compounds were mixed under the same conditions 3 pass mix Heat history hold for 90 sec at 150 C in 1 st and 2 nd master batch stages Test data. Actual results may vary. 6 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

7 NXT* Silane and TESPT Structures on Silica Surface TESPT (S4) silane MBTP NXT carbonyl DPG NXT* silane The carbonyl group of the NXT silane molecule can interact with silica and Zn surfaces The aliphatic tail provides the hydrophobicity needed to deliver superior dispersion of the silica Silica Surface Silica Surface 7 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

8 NXT* Silane Reaction with Silica Filler C S Si + H Si Silica Heat, T 1 C S Si Si Silica + CH 3 CH 2 H Long alkyl group aids in filler dispersion Thio ester group decreases reactivity with rubber 8 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

9 Deblocking/Coupling Mechanisms with NXT * Silane C S Si Si Silica + H-Activator Heat, T 2 H S Si Si Silica C + Activator Blocking group is removed during mixing/curing steps Mercapto group couples well with rubber 9 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

10 Milling First Step (MB1) S4 S2 NXT* Silane Poor milling performance NXT silane formed a band on the mill Considerable bagging on the mill NXT silane produced a smoother sheet appearance Significantly better milling performance with NXT silane 10 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

11 Milling Second Step (MB2) S4 S2 NXT* Silane Poor milling performance NXT silane formed a band on the mill Considerable bagging on the mill Better milling performance with NXT silane 11 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

12 Milling Productive Step (final step) S4 S2 NXT* Silane No significant difference on the mill in the productive pass with NXT silane vs. polysulfide silanes 12 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

13 NXT* Silane Showed Lower Final Viscosity Compared to S4 and S2 Mooney Viscosity Silane Silane 13 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

14 Aged Viscosity at Room Temperature (23 C) Room Temp Aged Viscosity More stable compound viscosity can be achieved with NXT* silane, enabling: S4 S2 NXT Silane Lower is better Increased compound age limits Compound shipment & storage Increased margin of error More consistent production More predictable processing 14 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

15 Heat Aged Viscosity at 50 C Heat Aged 50 C Viscosity Under manufacturing conditions compounds may see elevated temperatures. S4 S2 NXT Silane The polysulfide silanes exhibited significantly higher viscosity after only 7 days. NXT* silane showed significantly better viscosity stability under extreme conditions. 15 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

16 Garvey Die Extrusion S4 Garvey Rating (1=poor, 4=best) 1 Extrusion Temp ( C) 92 S NXT* SILANE 3 78 NXT silane showed significantly better extrusion performance with a lower extrudate temperature 16 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

17 Physical Properties Silane NXT* silane showed better tensile properties NXT silane demonstrated a slightly higher modulus at equal hardness NXT silane showed a higher reinforcing index and equal to better abrasion 17 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

18 Strain Sweep Payne Effect Strain Sweep at 55 C S2 S4 NXT Silane -17% Payne Effect NXT* silane showed a 17% reduction in Payne Effect 18 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

19 Strain Sweep Tan D Max Strain Sweep at 55 C S2 S4 +24% Rolling Resist. NXT Silane NXT* silane showed a 24% increase in rolling reduction 19 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

20 Temperature Sweep Temperature Sweep (.5 strain) Wet = S2 S4 NXT* Silane +22% Rolling Resist. 20 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

21 Summary NXT* silane can help ease of processing by: Allowing broad formulation latitude, especially with f-ssbr and high surface area silicas Extending compound shelf life Enabling better milling of compounds based on functional polymers Extruding at lower temperatures and producing a smoother sheet appearance Broad formulation flexibility. Excellent processing performance. Dynamic property advantages. 21 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

22 NXT* SILANES Advanced tire properties with less waste and higher productivity Stand C326 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

23 20 Copyright 2018 Momentive Performance Materials Inc. All rights reserved. Appendix

24 Processing & Cure Properties Processing Properties Units S4 S2 NXT* NXT Silane Mooney Viscosity MB1 CMS1+4(100 ºC) MU MB2 CMS1+4(100 ºC) MU FM CML1+4(100 ºC) MU o C, 30 Mins. MIN Torque (Mooney Low) dnm MAX Torque (Mooney High) dnm Δ Torque dnm T10 min T40 min T90 min T95 min Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

25 Physical Properties NXT* Silane 25 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

26 DYNAMIC PRPERTIES NXT* Silane 26 Copyright 2018 Momentive Performance Materials Inc. All rights reserved.

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