PHENOL-FORMALDEHYDE RESIN BASED TWO-COMPONENT ADHESIVE Russian patent published in 2012 - IPC C09J161/14 

FIELD: chemistry.

SUBSTANCE: invention relates to adhesive polymer substances and can be used extensively for gluing wood, wood plastics, polymers, metals, as well as materials with an uneven surface: foam plastics, foam glass-ceramics and other porous materials. The phenol-formaldehyde resin based two-component adhesive consists of a composition based on a resol type phenol resin and a hardener based on a product of condensation of sulphophenylurea with formaldehyde and orthophosphoric acid. The hardener additionally contains sulphuric acid and a surfactant selected from OP, with the following ratio of components, pts.wt: product of condensation of sulphophenylurea with formaldehyde and orthophosphoric acid 33-35; sulphuric acid 52-45; surfactant 15-20. A composition containing the following components is used as composition based on resol type phenol resin, pts.wt: resol type phenol resin 45.5-33.0; novolac type phenol resin 33.5-40.0; urea formaldehyde resin 11.08-17.47; petroleum ether 3.0-3.5; aluminium powder 0.02-0.03; furfuryl alcohol 0.5-1.0. The ratio of the hardener to the composition based on resol type phenol resin is equal to 1:14.6-19 pts.wt.

EFFECT: improved processing characteristics of the adhesive: longer life and higher strength.

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