Abstract
Chemlok 607 is widely used for bonding metals to fluororubber. However, it is not satisfactory with respect to the bond strength between metals and fluororubber. The aim of this study was to improve adhesion properties of Chemlok 607 for bonding metals to fluororubber. Modifications of Chemlok 607 were carried out with urotropine–resorcinol complexes. The effects of the complexes and vulcanizing pressure on adhesion were studied by tensile lap shear tests and scanning electron microscopy (SEM). Considerably positive adhesion effect was achieved by modification of Chemlok 607 with 1:1 (mole ratio) complex of urotropine and resorcinol when it was used for bonding steel to fluororubber vulcanized by an amine compound; tensile lap shear strength could be achieved to a level of 4.7 to 5.4 MPa. The complex was an ideal bonding accelerant agent for Chemlok 607 because it could promote formation of chemical bonds between fluororubber and Chemlok 607. When incorporated in the vulcanizing process, the complex could also generate many kinds of amino resins with a large number of hydroxide radicals (–OH) which improved adhesion to metal.
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