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Other Applications

Solder Fluxes
Solder flux and flux-cored solders are used to improve the quality of electrical connections by cleaning connector surfaces and promoting metal-to-metal bonding. Electronics connec- tions particularly require fluxes that leave minimal residues and are readily cleaned without oxidation of the connections. Where it is desirable to avoid cleaning the connections after soldering, a "weak acid" dilute adipic acid alcohol solution is preferred. Adipic acid is used in a number of flux and flux-cored solder formulations to activate the flux, promote metal cleaning, and minimize residual impurities and corrosion. The very low trace impurity levels of Adi-pure® highpurity adipic acid make it highly desirable for highquality electronics applications.
Epoxy Curing Agents
Carboxy-terminated polyesters are often used as curing agents for glycidyl ether resins
and for epoxidized olefin resins. The carboxy-terminated polyester prepared from adipic acid, diethylene glycol, and glycerol is used as a curing agent for the diglycidyl ether of bisphenol A.

Adipic acid and similar saturated dibasic acids are used at a mole ratio of less than 1:1 with diepoxy resins to promote etherification or are used in substantial excess with a sui-
table catalyst to accomplish resin cross-linking by condensation esterification.

The so-called fatty polyamides are often used for epoxy curing and can be prepared, for example, from adipic acid, ethanolamine, and ethylene glycol. Fatty polyamides impart flexibility and improved water resistance to epoxy coatings, particularly the glycidyl ether resins. Construction applications, general-purpose adhesives, and can seam bonding
are typical areas of use.
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»» Amines for Epoxy and Polyurethane
Leather Tanning
The primary function of a tanning agent is to stabilize collagen fibers in the fresh hide so they are not readily biodegradable. Adipic acid can be used to improve leather quality and to increase the utilization of chromium salts in tanning liquors, thereby minimizing chromium losses to effluent streams.
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»» DBA dibasic acid mixture in tanning
Flue Gas Desulfurization Scrubbers
Adipic acid and mixed dibasic acids that contain adipic acid are routinely used to enhance the performance of wet limestone scrubbers for flue gas desulfurization. Environmental re- gulations limiting sulfur dioxide emissions are expected to increase the demand for such scrubber systems. Adipic acid acts as a buffer, improves the scrubber efficiency by increa- sing the dissolution rate of limestone into the liquid slurry fed to the scrubber, and impro- ves the mass transfer of sulfur dioxide from the gas phase to the scrubber liquid. Adipic acid is preferred in forced-air oxidation limestone scrubber operations.
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»» DBA dibasic acid mixture in scrubbing
Cleaning Applications
Adipic acid and its derivatives can be used in a
variety of cleaning applications, ranging from
laundry detergents and bleaches to dishwashing
detergents and hard-surface cleaners. Laundry
detergents that contain adipic acid form watersoluble salts or chelate complexes and prevent redeposition of calcium, magnesium, and other metal salts onto fabrics. Amidoperoxyadipic acids are used for laundry bleaches that replace chlorine-based bleaches. The chelating properties of adipic acid are also valuable in formulating dish-
washing detergents and hard-surface cleaners for use in bathrooms and kitchens where solubilization of calcium- and magnesium-based soap scum is particularly important.

Not all applications of Adi-pure® High Purity Adipic Acid have been listed on this website. For more details on other applications, please contact us.

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»» DBE as cleaning solvent
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