Non-black Fillers in EPDM Extrusion Formulation · Page 2 Non-black Fillers in EPDM Extrusion...

Author: Hubert Oggermüller Approval: May 2008

VM / Dr. Alexander Risch _____________________

Non-black Fillers

in EPDM Extrusion

Formulation

(peroxide cured)

HOFFMANN MINERAL GmbH • P.O. Box 14 60 • D-86619 Neuburg (Donau) • Phone (+49-84 31) 53-0 • Fax (+49-84 31) 53-3 30 Internet: www.hoffmann-mineral.com • e-Mail: [email protected]

VM

-4/0

5.2

00

8/0

61

10

98

0

Summary

Two classes of filler are suitable for extrusion processing, particularly

when special profiles must be produced. The products based on Neuburg

Siliceous Earth and calcined clay produced the best extrusion properties

among the non-black fillers tested. Neuburg Siliceous Earth has a clear

advantage here in terms of price to performance ratio. Surface-treated

AKTISIL VM 56 wins on cost compared to untreated calcined clay, at the

same time providing better tensile strength, a higher modulus and a lower

change of elongation at break after ageing.

Where emphasis is placed on mechanical properties, combining the

active filler with carbon black or precipitated silica (or silicates in the case

of non-black applications) is a solution. Here the recipe must be adapted

to fit the specific needs involved.

Non-black Fillers

in EPDM Extrusion Formulation

(peroxide cured)

Test Compound

EPDM, 55 % Ethylene, medium diene-content

ML (1+8) 125 °C, approx. 821

100

Zinc oxide2 5

Stearic acid 2

Calcium oxide coated by special dispersion agents 80 %³ 10

Filler 250/110/75

Diethylene glycol (DEG), as indicated 0/3/5

Paraffinic oil4 60

Triallyl-cyanurate 50 %5 3

Bis(t-butylperoxy-isopropyl)benzene 40 %6 8

Regarding precipitated silica and the different types of precipitated silicate additional compounds with 3 phr DEG were examined. To obtain an adequate cross linking the various hard clays need the use of 5 phr DEG. Curing was carried out in a press at 180 °C. The curing time was t90 + 10 %. Please mind! The following figures show trend analysis, which only can be the basis for specific problems solving.

Filler: Precipitated Silica Precipitated Silicates Carbon Black All others

Loading: 75 phr

110 phr 110 phr 250 phr

Open Mill Batch Temperature Time of mixing

150 x 300 mm 500 cm³

50 °C 15 to 20 min

Extruder Temperature of barrel Temperature of head

d = 30 mm L/D = 15

70 °C 110 °C

Applied in this test compound:

(1) Vistalon 7500 , Exxon (2) Zinkoxyd aktiv, Bayer (3) Kezadol GR, Kettlitz (4) Sunpar 2280, Sun Oil Company (5) TAC 50 %, Kettlitz (6) Perkadox 14/40, Akzo

Contents

Index of Compound Costs

Properties of Raw Compound

Mooney Viscosity ML (1+4) at 120 °C Page 5 Mooney Scorch t5 (ML) at 120 °C Page 6 Extrudability (Quality), Rating Garvey-Profile Page 7 Extrudability (Quality), Torque of Extruder Page 8 Extrudability (Quantity), Maximum of Extrusion Speed Page 9 Extrudability (Quantity), Torque of Extruder Page 10 Rotorless Cure Meter, t5 at 180 °C Page 11 Rotorless Cure Meter, t90 at 180 °C Page 12

Properties of Vulcanizate

Tensile Strength Page 13 Elongation at Break Page 14 Modulus Page 15 Hardness Page 16 Tear Resistance Page 17 Rebound Elasticity Page 18 Abrasion Page 19 Compression Set Page 20

Properties after Air Ageing

Change of Tensile Strength Page 21 Change of Elongation at Break Page 22 Change of Hardness Page 23 Change of Tear Resistance Page 24

Annex

Pictures of extrusion profiles Page 25-27

Our technical service suggestions and the information contained in this report are based on experience and are made to the best of our knowledge and belief, but must nevertheless be regarded as non-binding advice subject to no guarantee. Working and employment conditions over which we have no control exclude any damage claims arising from the use of our data and recommendations. Furthermore, we cannot assume any responsibility for any patent infringements which might result from the use of our information.

Annex: Extrusion Profiles

Non-black Fillers in EPDM Extrusion Formulation · Page 2 Non-black Fillers in EPDM Extrusion...

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