Thanecure® ZM

An Activator/Accelerator for Sulfur Curable Polyurethane Rubber

(formerly known as Caytur® 4*)

Thanecure ZM is a cure activator for sulfur cured Millathane® polyurethane rubber. It consists of a partial complex of zinc chloride and MBTS. The improvement in the physical properties of Millathane E-34 is shown in the table below. Increasing the amount of Thanecure increases the rate and state of cure and improves the compression set resistance.

For the most practical applications, 1.0 part of Thanecure ZM provides a good balance between cure rate and processing safety. As the concentration of Thanecure ZM increases above 1.0 part, cure rate improves only slightly with reduced processing safety.

If it becomes necessary to increase scorch time for greater processing safety, MBT level can be reduced to 1.0 phr without changing the amount of Thanecure ZM.

Zinc oxide is not compatible with some polyester polyurethane rubber. Thanecure ZM, which contains active zinc, needs to be incorporated to insure proper state of cure. Thanecure ZM is used to cure both polyester (e.g., Millathane 76, Millathane HT) and polyether (e.g., Millathane E34, Millathane CM) and other types of sulfur curable polyurethane rubber.

EFFECTS OF THANECURE ZM ON PHYSICAL PROPERTIES

Millathane® HT 100.0
Stearic Acid 0.5
N550 Black 35.0
TP95 5.0
Vanfre AP 2 1.0
AC617A 1.0
Zinc Stearate 0.5
MBTS 4.0
MBT 2.0
Sulfur 1.5
Thanecure ZM As indicated


Parts Thanecure® ZM 0 0.5 1.0 1.5 2.0
Press cured 320°F (160°C), min. 34 19 13 10 8
Hardness, Durometer A 81 80 82 81 81
100% Modulus, psi 580 747 797 842 811
         MPa 4.0 5.2 5.5 5.8 5.6
200% Modulus, psi 1185 1565 1680 1736 1660
         MPa 8.2 10.8 11.6 12.0 11.4
300% Modulus, psi 1767 2222 2346 2385 2301
         MPa 12.2 15.3 16.2 16.4 15.9
Tensile Strength, psi 2400 2667 2683 2698 2595
         MPa 16.6 18.4 18.5 18.6 17.9
Elongation, % 464 437 408 406 410
Tear Die C, lb/in 236 230 223 208 216
kN/m 41 40 39 36 38
DIN Abrasion, mm3 loss 107 112 113 118 123
Compression Set, %, 22h @ 70°C 68 64 59 62 60