POLYVEST Liquid rubbers for enhanced tire performance
POLYVEST - Liquid rubbers for enhanced tire performance With POLYVEST Evonik provides a product range of liquid rubbers based on butadiene for the application in tires and mechanical rubber goods. All products are liquid polymers and provide a stereospecific microstructure with low glass transition temperatures. POLYVEST grades are perfectly suited as reactive plasticizers in rubber compounds since they provide an excellent compatibility with solid rubbers and a high reactivity towards sulfur vulcanization. Compared to conventional plasticizers they are chemically integrated into the rubber matrix during the vulcanization process, which prevents migration. Silane and maleic anhydride functionalized grades of POLYVEST allow improving the dispersibility of inorganic fillers in rubber compounds and their adhesion to polar substrates. LYVEST POLYVEST
Our Product Range POLYVEST grades for tire applications & mechanical rubber goods POLYVEST Silane-modified OEt EtO Si EtO R x y z n R OEt Si OEt OEt Grade Supply form Viscosity @ 30 C / (mpa s) Tg / C Mean molecular weight/ (g/mol) POLYVEST EP ST-E 60 Clear colorless liquid 4.700-80 Approx. 3.200 POLYVEST EP ST-E 80 Clear colorless liquid 5.000-80 Approx. 3.250 POLYVEST EP ST-E 100 Clear colorless liquid 5.400-80 Approx. 3.300 POLYVEST Non-modified z x y Grade Supply form Viscosity @ 20 C / (mpa s) Tg / C Mean molecular weight/ (g/mol) POLYVEST EP 130 S Viscous liquid 2.700-3.300-99 Approx. 4.600 POLYVEST Maleic anhydride modified O O O z x y MA Grade Supply form Viscosity @ 20 C / (mpa s) Tg / C Mean molecular weight/ (g/mol) POLYVEST MA 75 Viscous liquid 6.000-9.000-95 Approx. 3.000 POLYVEST EP MA 120 Viscous liquid 30.000 @30 C -92 Approx. 3.200 POLYVEST POLYVEST
POLYVEST ST Silane Terminated Liquid Rubber Liquid polymeric silane coupling agent for silica-reinforced tire tread compounds Key features and benefits POLYVEST ST Reduced compound viscosity No migration Improved micro-dispersion of silica Reduced Tan d at 60 C Reduced Payne effect POLYVEST ST is a new generation of silane-modified liquid rubber additives. It combines the advantages of liquid rubbers and functional silanes. Its silane functionalities allow the surface modification of hydrophilic silica fillers and therefore improve the dispersibility of silica in rubber compounds. Due to its rubber-based nature POLYVEST ST exhibits a natural fit and excellent compatibility to rubber matrix of tire compounds. During the vulcanization process it incorporates chemically, which exhibits a reinforcement of the rubber matrix and efficiently prevents migration. POLYVEST ST enables to improve the overall performance of silica-reinforced tire tread compounds in combination with sulfur silanes like Si 69 or Si 266. Its application allows to significantly reducing the rolling resistance, which has been indicated by reduced PAYNE effect and tan delta at 60 C in GREEN Tire and truck tire treads compounds. POLYVEST ST is available in three different grades with varying degree of silanization, which allows to optimize the silane/rubber ratio depending on the individual performance needs. POLYVEST ST
POLYVEST 130 S Unmodified Liquid Rubber Liquid Polybutadiene as partial oil replacement for tire tread compounds POLYVEST 130 S is a liquid rubber designed for the needs of the tire and rubber industry. It exhibits an excellent compatibility with different rubbers and allows the complete or partial replacement of oil while keeping the compound viscosity low. POLYVEST 130 S is reactively incorporated during the vulcanization process, which prevents migration and bleeding out. POLYVEST MA 75 and POLYVEST EP MA 120 are maleic anhydride functionalized grades, which improve the adhesion to metal surfaces. Key features and benefits POLYVEST 130 S Low glass transition temperature (-100 C) and low product viscosity Reduced compound viscosity No migration and reduced hardness change over time Excellent grip and breaking performance on ice and snow and at same time on wet and dry roads Increased wear resistance POLYVEST 130 s
Performance tests of POLYVEST ST in typical silica-reinforced tread compounds for PASSENGER CARS TIRES For technical information about POLYVEST 130 S please write an email to polyvest@evonik.com
Table 1: Comparison of silica-reinforced rubber compounds Partial replacement of process oil with POLYVEST ST Composition I Reference (with TDAE) II 5 phr POLYVEST ST-E 60 III 9 phr POLYVEST ST-E 60 S-SBR (oil extended) 96.3 96.3 96.3 BR 30.0 30.0 30.0 Process oil (TDAE) 9.0 0.0 0.0 POLYVEST EP ST-E 60 0.0 5.0 9.0 Silica (ULTRASIL 7000 GR) 90.0 90.0 90.0 Sulfur-silane (Si 266 ) 6.5 6.5 6.5 Sulfur 2.0 2.0 2.0 Further additives and process aids are included Table 2: Mixing procedure Mixing Unit: HF Mixing Group GmbH, Type GK 1,5E Stage 1 (65 rpm, batchtemp 145-160 C) 0.0-0.5 polymers 0.5-1.0 TMQ, 6PPD 1.0-2.0 1/2 silica, silane(s), ZnO 2.0-2.0 lift, clean 2.0-3.0 a) add CB to POLYVEST EP ST add mixture to the mixer b) add 1/2 silica c) add remaining chemicals 3.0-3.0 clean 3.0-5.0 mix and keep temp. at 145-160 C by adjusting RPM Stage 2: (batchtemp: 145-160 C) 0.0-1.0 1 st batch stage 1.0-3.0 mix and keep temp. at 145-160 C by adjusting RPM 3.0-3.0 dump, 45 sec. on open mill (4 mm nip), sheet out Stage 3: (batchtemp. 90-110 C) 0.0-2.0 2 nd batch stage, accelerators, sulfur 2.0-2.0 dump batch and process on mill during 20 sec. with 3-4 mm nip. cut 3 x left, 3 x right, roll up and pass through a 3 mm nip 3 x sheet off Figure 3: Stress-strain curves at 23 C 25 20 stress / MPa 15 10 5 0 I (Ref with TDAE) II (5 phr POLYVEST EP ST-E 60) III (9 phr POLYVEST EP ST-E 60) 0 100 200 300 400 500 strain / %
Figure 4: Shore A hardness and DIN Abrasion Hardness 70 120 62 61 60 58 100 Abrasion -8% 106 99 97 Shore A Hardness 50 80 40 60 30 40 20 20 DIN abrasion 10 reference (I) 5phr 9phr 0 reference (I) 5phr 9phr Figure 5: Improved rolling resistance indicated by reduced tan delta and increased ball rebound at 60 C Max. Loss Factor at 60 C Ball Rebound at 60 C Tan ( ) at 60 C 0,17 0,16 0,15 0,14 0,13 0,12 0,164-16% 0,147 0,137 Ball rebound at 60 C / % 65 60 55 50 45 59 +6% 60 62 0,11 reference (I) 5phr 9phr 40 reference (I) 5phr 9phr Measured with Zwick, 16 Hz, 50 N +/- 25 N Figure 6: RPA strain sweep at 60 C shows reduced PAYNE effect G* / MPa 4,5 0,25 4,0 3,5 3,0 2,5 2,0 1,5 0,20 0,15 0,10 1,0 0,05 0,5 0 0 0 1 10 100 0 1 10 100 tan I (Ref with TDAE) II (5 phr 60) III (9 phr 60) strain / % strain / %
Performance tests of POLYVEST ST in typical silica-reinforced tread compounds for TRUCK TIRES
Table 7: Performance test of POLYVEST ST in truck tire tread compounds Composition I Reference with carbon black II Reference with silica IV with POLYVEST ST-E 60 V with POLYVEST ST-E 80 VI with POLYVEST ST-E 100 Filler Carbon black 55 phr Ultrasil 7000 GR 55 phr Ultrasil 7000 GR 55 phr Ultrasil 7000 GR 55 phr Ultrasil 7000 GR 55 phr Natural rubber 100.0 100.0 100.0 100.0 100.0 Si 266 5.0 5.0 4.0 4.0 4.0 POLYVEST EP ST-E 60 - - 7.5 - - POLYVEST EP ST-E 80 - - - 7.5 - POLYVEST EP ST-E 100 - - - - 7.5 Sulfur 2.0 2.0 2.0 2.0 2.0 Further additives and process aids are included Table 8: Mixing procedure Mixing Unit: HF Mixing Group GmbH, Type GK 1,5E Stage 1 (65 rpm, batchtemp 145-160 C) 0.0-0.5 polymers 0.5-1.0 TMQ, 6PPD 1.0-2.0 1/2 silica, silane(s), ZnO 2.0-2.0 lift, clean 2.0-3.0 a) add CB to POLYVEST EP ST-E add mixture to the mixer b) add 1/2 silica c) add remaining chemicals 3.0-3.0 clean 3.0-5.0 mix and keep temp. at 145-160 C by adjusting RPM Stage 2: (batchtemp: 145-160 C) 0.0-1.0 1 st batch stage 1.0-3.0 mix and keep temp. at 145-160 C by adjusting RPM 3.0-3.0 dump, 45 sec. on open mill (4 mm nip), sheet out Stage 3: (batchtemp. 90-110 C) 0.0-2.0 2 nd batch stage, accelerators, sulfur 2.0-2.0 dump batch and process on mill during 20 sec. with 3-4 mm nip. cut 3 x left, 3 x right, roll up and pass through a 3 mm nip 3 x sheet off Figure 9: Modulus 300% and Elongation at break Reinforcement shown by increased Modulus Modulus 300% / MPa Elongation at break / % Modulus 300% at 23 C / MPa 14 +12% 14 14 600 13 13 500 12 12 12 400 11 10 9 8 300 200 100 7 0 Carbon Black Si266 PV ST-E60 PV ST-E80 PV ST-E100 Elongation at break at 23 C / % 521 Carbon Black 553 Si266 550 PV ST-E60 522 PV ST-E80 493 PV ST-E100
Figure 10: Shore A hardness and DIN Abrasion Hardness Abrasion Shore A Hardness 64 64 64 125 62 61 62 62 120 60 115 58 110 105 56 100 54 95 52 90 50 DIN abrasion 85 108 124 113 111 113 48 Carbon Black Si266 PV ST-E60 PV ST-E80 PV ST-E100 80 Carbon Black Si266 PV ST-E60 PV ST-E80 PV ST-E100 Figure 11: Improved rolling resistance indicated by reduced tan delta and increased ball rebound at 60 C Max. Loss Factor at 60 C Ball Rebound at 60 C Tan ( ) at 60 C 0,25 0,20 0,15 0,10 0,20 0,15-33% +8% 0,10 0,10 0,10 Rebound Elasticity* 75 73 70 69 65 63 60 75 74 0,05 Carbon Black Si266 PV ST-E60 PV ST-E80 PV ST-E100 55 Carbon Black Si266 PV ST-E60 PV ST-E80 PV ST-E100 Measured with Zwick, 16 Hz, 50 N +/- 25 N
POLYVEST, Ultrasil, Si 69 and Si 266 are registered trademarks of Evonik Industries AG or one of its subsidiaries. This information and all further technical advice are based on our present knowledge and experience. However, it implies no liability or other legal responsibility on our part, including with regard to existing third party intellectual property rights, especially patent rights. In particular, no warranty, whether express or implied, or guarantee of product properties in the legal sense is intended or implied. We reserve the right to make any changes according to technological progress or further developments. The customer is not released from the obligation to conduct careful inspection and testing of incoming goods. Performance of the product described herein should be verified by testing, which should be carried out only by qualified experts in the sole responsibility of a customer. Reference to trade names used by other companies is neither a recommendation, nor does it imply that similar products could not be used. Dr. Andreas Berlineanu Technical Service Global POLYVEST & POLYVEST MA Reactive Sealants Phone +49 2365 49-5497 andreas.berlineanu@evonik.com Dr. Niko Haberkorn Technical Service Global POLYVEST HT & ST Reactive Sealants Phone +49 2365 49-19937 niko.haberkorn@evonik.com 012/2018/e/gh/km EVONIK RESOURCE EFFICIENCY GMBH Coating & Adhesive Resins Paul-Baumann-Straße 1 45764 Marl Germany Phone +49 2365-49-4843 www.evonik.com/adhesive-resins