WERKWIJZE VOOR DE BEREIDING VAN EEN FENOLISCHE ALDEHYDHARS EN EEN HARSMATERIAAL VOOR EEN HECHTMIDDEL- SYSTEEM VOOR AANBRENGEN OP GLASVEZELS.

摘要

A method of preparing a thermoplastic, water-soluble, phenolic aldehyde resin involves two steps. Firstly, the phenolic compound and aldehyde are reacted to less than 100 percent completion at an aldehyde to phenolic compound mole ratio of 0.6 to 1.5 and at a pH of 3.5 to 5.5 for 3 to 10 hours at a temperature of 13 to 32 DEG C. Secondly the pH of the reaction is adjusted to above 7.0 to 7.5 and the reaction is continued between the unreacted phenolic compound and aldehyde and resinous mixture to produce a resinous mixture that has a predominant amount of trimer polymer with slight cross-linking and a minor amount of dimer and higher oligomers. The phenolic compound is preferably resorcinol or a mixture of resorcinol and phenol. The resin mixture is processed into an adhesive by combining it with one or more elastomeric latex and various latex additives. The adhesive is aged and has added to it an amine or ammonia to tie up any unreacted aldehyde. Also additional phenolic compound may be added. The adhesive is used to coat filamentary materials in particular glass fibres and the coated filamentary materials are dried to produce reinforcement material for rubber. Uses:- Tyre cords adhesives