Energy savings plus mechanical reinforcement and rheology control

1K, Pumpable, Heat Cured Natural Rubber Sealant by DPR Industries

Adhesives Formulation

Applicable Type

Sealants

Applicable Base Polymer

Natural rubbers (NR)

Applicable Industrial Sectors

Automotive , Household appliance assembly

Applicable Base Polymer Properties

DPR 40 is a liquid natural rubber product for use in rubber compounding and tire manufacturing. It is particularly useful as a general rubber compounding ingredient because it is natural rubber-based and can be reacted over the entire cure spectrum of natural rubber. Liquid natural rubber has an affinity to wet large amounts of dry ingredients and can be cured to a very hard matrix. Natural rubber has good resistance to water and to mold, but poor resistance to oil, solvents, and low temperatures.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Natural rubber, (DPR 40, DPR Industries)

xxx

Calcium carbonate

Zinc oxide

Stearic acid

t-Butyl perbenzoate

Crosslinking coagent (Sartomer 633, Sartomer)

Magnesium oxide (Maglite D, Hallstar)

Typical Properties

Properties

Cure schedule

xxxxxxxxxxxxxx

Tensile strength, psi

xxx

Elongation, %

xxxx

Hardness, Shore A

Lap shear adhesion (Initial) CRS to CRS (psi)

xxx

Lap shear adhesion (Aged 2 weeks @ 130°Cl) CRS to CRS (psi)

xxx

Processing

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Resulting Properties

A major application area of 1K, Pumpable, Heat Cured Natural Rubber Sealant is the auto industry where sealants are used as body-seam sealers and as undercoatings in wheel wells and other areas. Sartomer 633 is a metallic diacrylate coagent, which when added to peroxide-containing sealant formulations co-cures to provide the necessary properties for good sealant performance, especially adhesion. Heat age values (130°C/two weeks) increases over the RT tests. Failure mode is cohesive in all cases with the Sartomer 633 coagent. The source of this formulation is DPR Industries.