Method of adhesively uniting materials, espeeially metals, and adhesives therefor

摘要

In a modification of the method of uniting materials adhesively described in the parent Specification, the adhesive mixture which is spreadable at ordinary temperature, is applied to the unheated surfaces at ordinary temperature and hardened between the surfaces by heat. The mixture consists of an ethylene oxide derivative of a phenol which is either spreadable or solid, a solid hardening agent together if desired with a non-volatile liquid hardening agent, and, at least when a solid ethylene oxide-phenol derivative is employed a non-volatile solvent for the ethylene oxide derivative. Solid ethylene oxide-phenol derivatives are employed by condensing up to 2 molecular proportions of epichlorhydrin or dichlorhydrin with one molecule of phenol in alkaline medium. Spreadable products are obtained by employing a greater proportion of epichlorhydrin. The phenols employed may be those mentioned in the parent Specification or condensation products of phenols with formaldehyde or acetaldehyde may be used. The solid hardening agent may be any of those mentioned in the parent Specification. Non-volatile liquid hardening agents which may be mixed therewith are triethylene tetramine, ethyl isocyanate, phenyl isocyanate, phenyl isothiocyanate and trithiocyanuric acid triethyl or triisoamyl ester. Non-volatile solvents mentioned are resorcinol dimethyl ether, dibutyl phthalate, furfurol, and linseed oil, pinene, cymene, or cyclopentadiene together with another non-volatile liquid to obtain a mixture which is homogeneous and spreadable at ordinary temperature. In examples 1-4 aluminium sheets are united with a spreadable resin prepared from dioxy-diphenyl propane and glycerin a -dichlorhydrin mixed in example 1 with (a) phthalic anhydride and (b) dicyandimide; in example 2 the resin is heated with resorcinol dimethyl ether and dicyandiamide and melamine are used as hardening agents. In example 3 the resin is mixed with furfurol and phthalic anhydride is the hardening agent. In example 4 the resin is mixed with melamine and triethylene tetramine. Examples 5-15 are similar, employing a solid resin from dioxydiphenyl propane and glycerine-a -dichlorhydrin together with non-volatile liquids. In example 16 a number of adhesive agents are described incorporating resins from different phenols. Example 17 describes the uniting of copper to copper, iron to iron, zinc to zinc and brass to brass. Example 18 illustrates the effect of differing hardening times on the shear strength of the joint, and example 19 describes the uniting of glass to glass, glass to "Melopas" (Registered Trade Mark), and "Melopas" to "Melopas".