Hydroxybenzoic acid as pH buffer and corrosion inhibitor for antifreeze containing organosilicone-silicate polymers

摘要

This invention relates to single-phase antifreeze or coolant concentrates comprising an alcohol, a silicone-silicate copolymer and an organic basic pH buffer and corrosion inhibitor comprising a hydroxybenzoic acid or mixtures thereof. The concentrates are preferably used as coolants either undiluted or upon dilution with about 30 to about 90 percent by weight of water based upon the total weight of the coolant. The alcohol is preferably ethylene glycol. The coolant compositions are especially effective in inhibiting the corrosion of aluminum internal combustion engine and radiator components.