Phenolic resin compositions and corresponding two-component binder systems for polyurethane cold-box and / or non-burning processes, applications and processes

摘要

A polyurethane cold-box and / or phenolic resin composition for a non-burning process is disclosed. The phenolic resin composition is an ortho-condensed phenolresol having etherified and / or free methylol groups in a total amount of 40 to 60% by weight, based on the total mass of the phenolic resin composition; Free formaldehyde in an amount less than 0.1% by weight based on the total weight of the phenolic resin composition; At least one reaction product of formaldehyde and at least one C-H-acidic reactive compound; The total amount of at least 38 wt%, and the amount of water in the phenolic resin composition does not exceed 1.0 wt% based on the total mass of the phenolic resin composition in each case. It is also possible to use as a formaldehyde scavenger for preparing polyurethane cold-box and / or two-component binder systems for non-burning processes, polyurethane cold-box and / A process for producing a phenolic resin composition, a process for producing a two-component binder system and a process for producing a feeder, a casting mold or a casting core from a molding material mixture and finally a process for producing a core for a corresponding feeder, casting mold, .