Processing fluid for soldering electric and electronic parts etc. - contg. specified aliphatic di:carboxylic acid and alcohol ester(s) fluid at utilisation temp. and/or ester of polyvalent alcohol and carboxylic acid

摘要

The liq. contains an ester which is fluid at the use temp. and comprises an ester of an aliphatic 8-16C dicarboxylic acid and an 8-16C alcohol and/or an ester of a polyvalent alcohol and an aliphatic 8-16C carboxylic acid. Also new is the use of the liq. as soldering flux, a liq. for hot-oil-levelling, as a melting bath liq., as a carrier medium for hot-air-levelling and/or as a carrier medium for IR melting process. The ester is pref. of trimethyl adipic, dodecane dicarboxylic or azelaic acids with an aliphatic 8-16C alcohol, esp., (iso)octyl and/or decyl alcohol. Or the ester is of an (un)satd. 8-16C fatty acid with an aliphatic 4-8C polyol with 3-6 hydroxy gps., esp. sorbitol, inositol, pentaerythritol and/or trimethylol propane. The ester is pref. dioctyl or octyl-decyl 2,2,4-trimethyl adipate, dioctyl dodecane dicarboxylate, diisooctyl azelate trimethylo propane tripelargonate and/or pentaerythritol tetraoleate. The liq. pref. contains as activator 0.5-10 wt.% of mono- and/or di-ester(s) of orthophosphoric acid with a 8-18 C alcohol, pref. of 2-ethyl hexyl and/or isotridecyl alcohols. As a further activator it may contain 0.05-3 wt.% of hydrogen bromide. The liq. pref. contains up to 5 wt.% of an organic solvent with a dielectric constant of 60-110, pref. formamide, ethylene and/or propylene carbonate. ADVANTAGE - Liq. is not harmful to the mechanical and electrical properties of the prods., does not cause corrosion, meets safety standards, is environmentally friendly and has high solubility for activators, fluxes and reaction prods.