Energy savings plus mechanical reinforcement and rheology control

1K Waterborne Neoprene Adhesive for Foam Bonding

Adhesives Formulation

Applicable Type

Waterborne Adhesives

Applicable Base Polymer

Chlorinated Rubbers / Chloroprenes (CR)

Applicable Industrial Sectors

Automotive

Applicable Base Polymer Properties

Polychloroprene lattices have not widely replaced solvent based contact cements as originally thought. It takes a waterborne adhesive much longer to dry, and if force dried the energy used is an added cost. The autohesion properties of water based polychloroprene adhesives provide lower initial strength and make bonding at low pressures difficult. Also the heat and moisture resistance of these adhesives is generally lower than their solvent based counterparts because of the presence of surface active ingredients. However, significant development work has occurred over the last several years to minimize these problems.

Typical Formulation Ingredients

Ingredient

Parts by weight

Polychloroprene latex, 55% solids (Dispercoll C-84, Bayer)

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Tackifier (Demulsene TR602, Bayer)

Acid scavenger, 33% solids (ZnO2 Dispersion)

Antioxidant, 50% solids (Vulkanox Dispersion, Lanxess)

18% Glycine solution (for pH adjustment)

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Optional ingredients: surfactant, defoamer, colorant

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(Source: Bayer)

Typical Properties

Properties

• To make the adhesive coagulate (break) upon spraying it is necessary to adjust the pH down to the point where the latex is barely stable. This can be done with glycine or dilute hydrochloric acid

• High wet bond strength

• High tensile strength and elongation

Processing

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Resulting Properties

Neoprene latex adhesives have been found to be an excellent alternative to solvent based adhesives. Dispercoll C-84 is a strong crystallizing grade neoprene latex which has high tensile strength. It is a strong crystallizing polymer resulting in a short open time. Recently, one component foam adhesives have become popular because it is not necessary to adjust mix ratios between the latex/resin “Part A” and the salt solution. The challenge of a 1-component formulation is to avoid coagulating the adhesive before it is sprayed. If the pH is adjusted too low the latex will coagulate in the container. If the pH is too high, spraying will not cause coagulation.

Tips and Tricks

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