Aqueous cleaners

Butyl glycol ethers, the largest volume derivatives of -butyl alcohol used ia solvent appHcations (10), are obtained from the reaction of 1-butanol with ethylene oxide. The most important of these derivatives, 2-butoxyethanol, is used principally ia vinyl and acryHc paints as well as ia lacquers and varnishes. It is also employed ia aqueous cleaners to solubilize organic surfactants. 2-Butoxyethanol [111-76-2] has achieved some growth at the expense of the lower alkoxyethanols (ie, methoxy and ethoxyethanol) because of 2-butoxyethanol s lower toxicity. 

Aqueous cleaners, for electroplating, 9 781 Aqueous corrosion, ion implantation and, 14 451-452... 

Table 7.8. Physical properties of assorted aqueous cleaners.

Discussion of each substitution approach is provided below. Most emphasis is given to aqueous cleaners, since this is the major and often most effective alternative. 

Diphase Cleaning. Use of an organic solvent top layer over a mild aqueous cleaner solution was popular for aiding in the removal of buffing compounds, especially on zinc base die castings. Use of this diphase cleaning has declined with the decline in buffed zinc castings. 

Aqueous and semi-aqueous cleaners are used primarily to clean printed-circuit boards prior to assembly, during application of the solder paste and adhesive (if they have been misprinted or smudged), and after assembly and solder reflowing. Highly automated multi-stage cleaning consoles are used in production where the parts are cleaned in a series of baths ending up with one or more deionized water rinses. 

Fast drying and surfactant-free water-based cleaner using microphase cleaner technology pH neutral aqueous cleaner, with long bath life... 

Easy to use, long-tank life, alkaline aqueous cleaner designed for batch washers Easy to use, low pH aqueous cleaning solution for ultrasonic immersion cleaning systems... 

Aqueous cleaner for removal of rosin, water-soluhle, and all no-clean flux, both eutectic and lead-free applications, from printed-drcuit assemblies... 

Alkaline (9-10 pH) aqueous cleaner such as Micronox MX2628... 

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