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DURAZONE® 37 A NON-MIGRATORY, HIGH PERFORMANCE ANTIOZONANT DESIGNED TO MAINTAIN ORIGINAL RUBBER PRODUCT APPEARANCE

TOM CROFTTECHNICAL SERVICE MANAGER FOR TIRE AND RUBBER APPLICATIONS

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DURAZONE® 37

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CAS Number: 121246-28-4

Molecular Weight: 694

Melting Point : 70 – 74C (158 – 165F)

Physical Form: Purple flake

Specific Gravity: 1.05

Solubility: Insoluble in water, Soluble in hexane, benzene, xylene. Slightly soluble in acetone and MEK

2,4,6-Tris-(N-1,4-dimethylpentyl-p-phenylenediamino)-1,3,5-triazine

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BENEFITS OF DURAZONE® IN RUBBER COMPOUNDING

• Can be used in colored compounds where discoloration is a problem

• Low softening point makes DURAZONE® 37 usable in single pass mixing operations

• No harmful effects on shelf life of mixed compound

For Non-tire

producers:

• Protects the original appearance of tires from unwanted changes due to surface bloom in sidewall and other visible components

• Can be combined with Naugard Q for synergistic impact on resistance to oxidation and ozonation

• Equal or improved ozone resistance when compared to 6PPD

• Can be used in sidewall compounds in contact with white labeling or striping with no problematic staining

For Tire producers

:

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• High Molecular Weight: Will be stable in the rubber matrix. Volatilization is not a problem in most rubber compounds.

• Non-Discoloring : Can be used in light colored compounds without the problems associated with staining or discoloring of traditional antiozonants.

• Can be Combined with Other Antidegradants: Can be combined with other antidegradants that offer other unique properties such as NAUGARD® Q or OCTAMINE® to give a protection package to resist oxidation and ozone attack. These synergistic blends are often very cost effective means to protect a rubber compound.

• No Impact on Rubber Compound Physical Properties: Has been used with a variety of elastomer types (NR, SBR, NBR, CR, BR, etc) with minimal or no negative effect on physical properties such as hardness, tensile and elongation.

IMPORTANT FEATURES OF DURAZONE® 37

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• Tire Sidewalls

• Hose Cover

• Windshield Wiper

• Automotive Trim

• Tire Tread

APPLICATIONS FOR DURAZONE® 37

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• Athletic Footwear

• Architectural Seals

• Sponge Compounds

• Playground Equipment

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DURAZONE® 37 HAS LITTLE TO NO IMPACT ON CURE RATE

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Polychloroprene GW 100 100 100Mg Oxide 4 4 4Polyethylene wax 3 3 3N990 50 50 50Clay 50 50 50ZnO 5 5 5TBTD 1.5 1.5 1.5DOTG 0.5 0.5 0.5OCTAMINE® 0 2 0DURAZONE® 37 0 0 2

Rheometer, @ 1600C

ts1,min 1.2 1.1 1.2tc90, min 7.91 7.72 7.87

DURAZONE® 37 Impact on Cure Rate

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DURAZONE® 37 PERFORMANCE

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Control Octamine 2 phr Durazone 37 2 phr

0

200

400

600

800

1000

1200

Polychloroprene Compound, ASTM D1149, Ozone Exposure, 50 pphm, Hours to Cracking

Hrs to Crack-ing

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DURAZONE® 37 SHOWS LITTLE TO NO SURFACE BLOOM

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SMR 5CV 60 60EPDM 70 70N660 45 45ZnO 3 3Stearic Acid 1 1TBBS 0.9 0.9Sulfur 1.5 1.56PPD 2.4 0Durazone 37 0 2.4

Extension Cycling Fatigue TestASTM D4482Aged 70 hrs @100C,KC to failure 368 378

Appearance Change in Sidewall Compound

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DURAZONE® 37THE NON-MIGRATORY ANTIOZONANT

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Ozone Aging, NR / EPDM Sidewall Compound, Run 72 hrs Continuously, 50 pphm @ 40C

Left 6PPD (2.4 phr) and Right DURAZONE®37 (2.4 phr)

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NON-STAINING PERFORMANCE OF DURAZONE® 37

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SMR-5CV 100 100N-326 50 50ZnO 3 3Stearic Acid 1 1Naphthenic Oil 15 15TBBS 0.7 0.7Sulfur 2.2 2.2DURAZONE® 37 4 0

6PPD 0 4

Aged 2 weeks, 700CASTM D573% RetentionTensile Strength 121 118Elongation 81 83300% Modulus 220 208

NR Sidewall Compound for Non-staining Comparison

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NON-STAINING PERFORMANCE OF DURAZONE® 37

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(l) 4.0 PHR 6PPD (r) 4.0 PHR DURAZONE® 37

Ageing Period 30 Days at Room Temperature

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IMPROVING DYNAMIC PROPERTIES WITH DURAZONE® 37

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SBR 1502 50 50SBR 1778 70 70N234 55 55ZnO 3 3Stearic Acid 1 1DURAZONE® 37 1 06PPD 0 1TBS 0.5 0.5MBS 0.5 0.5Sulfur 1.8 1.8

DURAZONE® 37 versus 6PPD in Dynamic Flexing Testing

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DYNAMIC PROPERTIES PERFORMANCE WITH DURAZONE® 37

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Relationship of tan delta to temperature change equal for DURAZONE® 37 and 6PPD.

Tan delta is an indicator for rolling resistance properties in tire tread compounds. Lower tan delta would indicate improved rolling resistance.

6PPD

Durazone 37

Antiozonant, phr 1.0 1.0 Dynamic Properties, Cured 10 min. at 177ºC (350ºF) Extension Cycling Fatigue Test - ASTM D4482 Aged 70 hrs at 100ºC (212ºF), kc 82.8 107.4 Dynamic Properties Tangent Delta at 4ºC (39ºF) 0.184 0.179 Tangent Delta at 28ºC (82ºF) 0.166 0.155 Tangent Delta at 53ºC (127ºF) 0.143 0.131 Tangent Delta at 77ºC (171ºF) 0.133 0.121 Tangent Delta at 102ºC (216ºF) 0.120 0.120 Dynamic Modulus (G*) at 4ºC (39ºF), MPa 8.53 7.75 Dynamic Modulus (G*) at 28ºC (82ºF), MPa 6.16 5.53 Dynamic Modulus (G*) at 53ºC (127ºF), MPa 4.62 4.34 Dynamic Modulus (G*) at 77ºC (171ºF), MPa 4.00 3.73 Dynamic Modulus (G*) at 102ºC (216ºF), MPa 3.58 3.39

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WORKER SAFETY CONCERNS

In addition to the low migration tendencies of DURAZONE® 37 when fully incorporated into a rubber compound, DURAZONE® 37 is quite low for volatility in normal rubber processing conditions.

In normal mixing, milling, extrusion, molding and calendaring operations, there should be minimal to no worker exposure to vaporized DURAZONE® 37.

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Weight loss is less than 0.15% from 100 – 150oC

THERMAL STABILITY OF DURAZONE® 37 IN PROCESSING

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No significant Weight Loss for DURAZONE® 37 Until Well Past Processing Temperatures

THERMAL STABILITY OF DURAZONE® 37 IN PROCESSING

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CONCLUSIONS

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