Nipol ® NBR Elastomers
Specialty Elastomers - Carboxylated NBR
Carboxylated Nipol NBR's are used in high abrasion applications,such as rolls, conveyor belting, hose covers, oil well drilling parts, high modulus wear seals and premium footwear soles. Working with carboxylated Nipol NBR's require special compounding considerations. Customary peroxide of sulfur cure systems common to conventional Nipol NBR react identically with the butadiene network in the carboxylated Nipol. However, there are now the acid-base reactions of the carboxylation with metallic oxides, metallic salts, amines and a wide variety of other acid-reactive materials which form a second crosslinking network. Water is the primary catalyst for the carboxyl-metallic reactions and must be treated as an "ultra" accelerator. Many compounding ingredients contain water, and this must be kept in mind when working with carboxylated Nipols. Volatizing the water through heat generated during mixing is the best way of removing it. Always add Zinc Oxide and Amine containing materials in the second pass when mixing in order to avoid scorch issues.
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Product
Grade |
% ACN |
Mooney
Viscosity |
Specific
Gravity |
AO
Type |
Special Properties/Applications |
| NX775 |
26 |
38-52 |
0.98 |
NS |
Excellent processing with conventional zinc oxides, Fast cure rate. Carboxyl content is 0.083 EPHR. FDA 177.2600 clearance. |
| 1072 |
27 |
40-55 |
0.98 |
NS |
Oil resistant mechanical goods with outstanding abrasion resistance. Carboxyl content is 0.075 EPHR. FDA 175.105 & 177.2600 clearance. |
| 1072CGX |
27 |
22-35 |
0.98 |
NS |
Cement grade version of Nipol 1072. FDA 175.105 & 177.2600 clearance. |
| 1072x28 |
27 |
35-55 |
0.98 |
NS |
Precrosslinked version of Nipol 1072. Exhibits very low nerve for extrusion and calendered goods. |
| DN631 |
33 |
48-63 |
0.99 |
NS |
Exhibits good oil resistance and high tensile strength. Used in belt, seal and roll applications. | |
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Preplasticized Nipol 1082V has found a primary niche market for making soft 15 to 35 Shore A printing rolls and other low hardness calendered and molded goods. Carboxylated Nipol NX775 is used in high abrasion applications, such as hose covers, oil well drilling parts, high modulus wear seals and premium footwear soles.
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The present generation of cold Nipol NBR elastomers spans a wide variety of compositions. Acrylonitrile contents range from 19% to 51%. Mooney values for bale Nipols range from a tough 110 to pourable liquids.
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Hot polymerized Nipol elastomers are highly branched and are excellent for thin walled or complex extrusions. They are also ideal for solvent-based adhesives. The combination of low gel content and high degree of branching encourages good tack and a strong bond.
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