PILFLEX 13
  • Overview
  • Compounding Information
  • Application

Chemical Name

N-(1,3-dimethylbutyl)-N’-phenyl-p-phenylenediamine. (6PPD)

Chemical Structure

CAS Reg. No.

793-24-8

Mol. Wt.

268

Product Specification

Parameter

Limits

Test Method

Product form

Pastilles

-

Color

Dark purple

-

Assay (GC ) ,% (min)

97.0

D 4937

Melting Point (Initial), °C (min)

46.0

D 1519

Melting Point (Final), °C

48-51

D 1519

Heat Loss, % (max)

0.30

D 4571

Ash, % (max)

0.10

D 4574

Typical Data

Viscosity @ 60 °C, cps

27-38

NOCIL G-5

Specific gravity at 60°C.

0.986-1.00

NOCIL G-25

Bulk density , kg/m3

550 - 590

NOCIL G-44

Product Information                                

Solubility

Soluble in acetone and ethyl alcohol; moderately soluble in hydrocarbon solvents. Insoluble in water.

Classification

High activity Antidegradant.

Discoloration & Staining

Discolors white / colored products. Contact / Migration staining is experienced on other surfaces in contact with rubber products containing 6PPD.

FDA Approval Status

Regulated for use in articles in contact with food under BgVV  XXI, Category  3-4. Not regulated for use in articles in contact with food under FDA.

Toxicity Data
(Please refer to the latest
Toxicological information.)

Slightly harmful by mouth. (Oral LD50rat 2500-3340 mg/kg). Not a skin or eye irritant. Unlikely to cause skin sensitization in man except individuals sensitized by other para phenylenediamines.   

Handling & Personal Protection

Ensure good ventilation and avoid creating dusty atmosphere.  In case of eye or skin contacts wash out with clean water for 5 to 10 minutes. 

Storage

Always store in a cool (below 30ºC) & dry place in single stack pallets away from direct sun light or any other heat source to avoid compaction.

Packaging

Paper Bag / Drum

Paper Bag: 20 kg / Fiber board drum: 50 kg.

FIBC

500 kg / 800 kg

Storage Life

12 months when stored as stated above.

Color code

Green colored strip.

Pilflex 13 is an alkyl-aryl-PPD antidegradant most widely used in the tyre and non-tyre sector of the rubber industry. Pilflex 13 offers excellent resistance to rubber vulcanizates against degradative forces such as ozone (static as well as dynamic), flex-cracking and fatigue, oxidative heat ageing, metal-ion catalyzed oxidative ageing, UV light and weathering. Pilflex 13 pastilles are easy to handle on all types of weighing systems and quickly disperse in rubber compounds even at lower processing temperatures.
 

Pilflex 13 is the most suitable PPD antidegradant for NR, NR-BR blend, SBR, SBR-BR blend, NBR, IR, IIR and polychloroprene based compounds and is preferred over Pilflex IP due to its higher molecular weight, low volatility, lower water leaching / oil and fuel extraction rates, balanced migration rates and non-toxic nature with respect to skin sensitization. Pilflex 13 is not recommended for white / colored products since it   can cause severe discoloration as well as contact / migration staining. Pilflex 13 exhibits very good solubility in general purpose rubbers and its mobility is further improved in the presence of paraffin / microcrystalline / blended wax.
 

Pilflex 13 tends to decrease the viscosity of the rubber compounds and also acts as a very mild amine activator of cure. However, as compared to Pilflex IP, it shows negligible effect on scorch / cure activation. Pilflex 13 is particularly suitable for polychloroprene based compounds where only small dosages, e.g. 0.5 phr, show marked improvement in ozone and flex-fatigue resistance and it is also very effective antiozonant for NBR based compounds where lower extractability of antidegradants in oils and fuels is a  primary requirement. Pilflex 13 is an effective antidegradant for butyl tubes to prevent strain induced cracking due to ozone attack at the folded edges of the packed tube.
 

Pilflex 13 alone can provide excellent protection to rubber  vulcanizates against all degradative forces; however, it is generally used in combination with Pilnox TDQ for economic as well as technological advantages. Pilnox TDQ provides equivalent heat and oxidative ageing resistance at  much lower cost (for which, otherwise, Pilflex 13 would have been consumed) and    improves the flex-fatigue resistance of the  rubber vulcanizates by 25 to 30% than if  Pilflex 13 were used alone  (particularly where  higher dosages of Pilflex 13 have to be used).
 

Pilflex 13 (and other para phenylenediamine antidegradants) are always used along with 0.5-2.0 phr of paraffin / microcrystalline / blended wax. These waxes provide synergistic effect  with antidegradants for enhancing the antiozonant and antiflex cracking characteristics. The waxes have the ability to act as carriers of the para phenylenediamine antidegradants over the surface of the rubber  vulcanizate &  the paraphenylene diamine antidegradants have the ability to increase the thickness and uniformity of wax bloom over the surface. The rubber product has to perform & the migration rates desired across the cross section of the single compound / multi-compound rubber product. The base compounding formulation design also plays an important role for selection of waxes.
 

Pilflex 13 along with waxes is widely used at 0.5-3.5 phr dosages as an antiozonant and anti flex-cracking system. Its combination with Pilnox TDQ in 1:1 ratio provides additional heat and flex-fatigue protection. For more severe conditions of flex – fatigue and ozone resistance, Pilflex13 / Pilnox TDQ ratio is increased to 2.0-3.5 : 1. Inclusion of Mixed Diaryl PPD at 0.5-1.0 phr as additional paraphenylene diamine  antidegradant further improves flex-fatigue resistance and ensures persistency of the antidegradant system. For superior heat ageing resistance, Pilflex 13 -Antioxidant MBI combination in 1:1 ratio is used at 0.4-0.8 phr levels.

Pilflex 13 and its combinations with other antioxidants / antiozonants is used in the manufacture of Truck and Bus,OTR, LCV, Passenger Car, Motorcycle, Scooter, Industrial & Farm Tyres and Tubes, Bicycle Tyres & Tubes, Conveyor belts, V & Fan Belts, Power Transmission Belts, Cables, Hoses, Tubings and other miscellaneous Molded and Extruded rubber products based on NR, NR-BR, SBR, SBR-BR, NBR, IR, IIR, CR, EPDM, etc.
 

TYPICAL DOSAGES:

Typical dosages of Pilflex 13 / its combination with other antidegradants for various applications are given below:
 

TYPICAL DOSAGES OF PILFLex 13

Product

Antioxidant / Antiozonant / Wax , phr

Rubber

Pilflex 13

Pilnox TDQ

Blended Wax

Truck Tyres
Treads (Cross ply, Front Tyres)
Treads (Cross ply, Rear Tyres)
Treads (Radials)
Sidewall (Cross ply)
Sidewall (Radials)
Carcass (Cross ply)
Carcass (Radial)

NR-BR
NR
NR-BR
NR-BR
NR-BR
NR
NR

2.5-3.5
3.0-3.5
3.0-3.5
2.7-3.0
3.0-4.0
0.7-1.0
0.7-1.0

1.0
1.0
1.0
1.0
1.0
1.0
1.0

0.7-1.0
0.7-1.0
0.7-1.0
1.5-2.0
1.5-2.0
-
-

Passenger Tyres (Radials)
Tread

Sidewall
Carcass

NR-SBR-BR
SBR-BR
NR-BR
NR/ NR-SBR

2.5-3.0
2.5-3.0
3.0-3.5
0.5

1.0
1.0
1.0
1.0

1.5
1.5
1.0
-

Motor cycle / Scooter Tyres
Tread
Carcass

SBR-BR
NR-SBR

1.75-2.0
0.5

1.0
1.0

1.0
-

Auto Tubes

IIR
NR

0.5
1.0

-
1.0

-
1.0

Flaps

NR/ NR-RR

0.5

1.0

1.0 *

Bicycle Tyre Treads

NR-RR
NR-BR-RR

0.5
0.5

1.0
1.0

1.0 *
1.0 *

Bicycle Tubes

NR

0.5

1.0

0.5 *

Cycle Tyre curing bags

NR

1.0

1.5-2.0

-

Retreads
Hot cure
Cold cure

Cushion gum

NR/NR-BR
NR-BR
SBR-BR
NR

0.5-0.75
1.0
1.0
-

1.0
1.0
1.0
1.0

0.5
0.7
0.7
-

Conveyor belt cover

NR
NR-SBR

1.0-1.5
1.0-1.5

1.0-1.5
1.0-1.5

0.5-0.7
0.5-0.7

V belts
Base
Cushion

NR
NR

1.0
0.5

1.0
1.0

-
-

Molded & Extruded goods

NR/NR-SBR
NBR

0.5-1.0
0.5-1.0

1.0
1.0

1.0 *
1.0 *

*  Paraffin wax may be used

Antidegradants
Awards / Certifications