Solvent meets aerospace criteria

Banner Chemicals Group, the United Kingdom, has announced that the Evolve range of solvents originally developed as an alternative to 1,1,1, trichloroethane for cold-cleaning applications by ICI meets the needs of aerospace applications. Its ability to match the strict criteria of aerospace applications has resulted in companies including BAE, Rolls-Royce, British Airways, UKMOD and Leica approving Evolve for use.

A rapidly evaporating, no-residue and odourless product, Evolve removes oils, greases, shop soils and related contamination from all types of metals. Being odourless, worker comfort is enhanced and a high occupational exposure limit enables a range of uses. Contact: Banner Chemicals Group, Hampton Court, Manor Park, Runcorn WA7 1TU, United Kingdom. Tel: +44 (1928) 597 000; Fax: +44 (1928) 597001; E-mail: info@bannerchemicals.com.


Source: www.manufacturingtalk.com
Ozone-safe metal cleaning fluids

Aragorn Resources, the Philippines, offers ozone-safe paraffinic hydrocarbon cleaners. Hydroclin cleaners are specifically developed for ultrasonic and heated washing machines. This high-quality product will not leave any residue, is non-reactive and non-staining to metals. The cleaning efficiency is comparable to chlorinated solvents and chlorofluorocarbons minus the ozone depleting potential, as the vapours naturally decompose upon exposure to sunlight. Hydroclin has excellent distilling and recovery properties, and retains its quality even after considerably long thermal exposure. It is available in different grades, drying time and boiling point or distillation ranges for customer preference.

Isoclin cleaners are super premium quality paraffinic hydrocarbon cleaners, which are virtually odourless, 100 per cent volatile and residue-free for spotless drying. They are for the same applications as Hydroclin cleaners, as well as for highly sensitive applications requiring the highest possible quality and lowest odour levels. The product is environment-friendly and does not contribute to ozone layer degradation. Ionic micro corrosion is virtually impossible with the use of this product. It is available in several grades with different boiling ranges and drying times to suit particular applications. Contact: Aragorn Resources, 5-B Poblete Compound, 343 West Service Road, Sun Valley, Paranaque City, The Philippines. Tel: +63 (2) 776 1358; Fax: +63 (2) 541 9735; E-mail: info @aragornchem.com.


Source: www.aragornchem.com

Ultrasonic cleaning tanks for soft metals

Industrial quality Kerry ultrasonic tanks, from Guyson International in the United Kingdom, provide speedy cleaning for welded metal joints on a variety of materials including aluminium and copper. These are suitable particularly where the raw metal material is being used without paint or other coating to mask any discolouration on the components.

Pulsatron UCR and KS tanks are used to rid the components of weld discolouration. These tanks allow the user to preset exact cleaning times and temperatures, ensuring that consistent levels of cleanliness are kept from batch to batch and providing an affordable way to improve cleaning quality. All functions are controlled by a simple four-button membrane keypad. An LCD panel displays the temperature and time set by the user, the time elapsed since the start of the cleaning process, and the status of the power supply, heater and ultrasonics.

Each unit works within operating temperatures from 20 to 80C, which can be set in 1 increments, allowing the optimum temperature to be selected for a particular combination of component material, cleaning solution and contaminant. Sonics time may be set in the range 0.1-99.9 min in 0.1 min increments, or to constant when sonics may be switched on and off manually. KS and UCR ultrasonic clean and rinse systems come in a range of sizes: Standard KS ultrasonic tanks come in a range of sizes up to 248 litre capacity, while UCR ultra clean and rinse tanks come in capacities to 117 litres. Contact: Guyson International, Snaygill Industrial Estate, Keighley Road, Skipton, North Yorkshire, BD23 2QR, United Kingdom. Tel: +44 (1756) 799 911. E-mail: leeds@ guyson.co.uk.


Source: www.manufacturingtalk.com

N-propyl bromide-based machining fluid formulations

Garrett Services, the United States, has patented a machining fluid admixture comprising a major amount of n-propyl bromide and a minor amount of a lubricant for cooling and lubricating a tool/ workpiece interface. The machining fluid consists of about 30.0 to about 99.99 weight per cent n-propyl bromide, about 0.01 to about 30.0 weight per cent of a lubricant, and optionally up to about 70.0 weight per cent of a fluorinated chemical.

The lubricant component of the machining fluids may be a mineral oil, a synthetic lubricating oil or a mixture thereof. The synthetic lubricating oil may or may not have a halogen constituent, and may be selected from a polyol ester, a polyalkylene glycol, a glycol ether, an isoparaffin or a mixture thereof. The polyalkylene glycol may be ethylene glycol monobutyl ether, propylene glycol methyl ether or their mixture, while the isoparaffin may be 2,2,4-trimethylpentane. The fluorinated chemical component of the inventive machining fluids may have the formula CaFbHcNdOe wherein a = 2 to 8, b = 5 to 18, c = 0 to 13, d = 0 to 2 and e = 0 to 2; for example, 1,1,1,2,3.4,4,5,5,5-decafluoropentane, 1-methoxy-nonafluorobutane or a mixture thereof.


Source: www.freepatentsonline.com

Cosmetics with hydrofluoroether

Daikin Industries Ltd., Japan, has been assigned a United States patent on a cosmetic containing at least 1 per cent by weight of hydrofluoroether having a viscosity of less than 5 mPas at 25C. The HFE is represented by the general formula CnHmFlOCxHyFz wherein n is a number from 1 to 12, m is a number of 0 to 25, l is a number from 0 to 11 and m+1 = 2n = 2x+1, and x is a number from 1 to 12, y is a number from 0 to 25, z is a number from 0 to 11 and y+z = 2x+1, provided that m and y, and l and z, are not zero simultaneously.

The inventors have found that a partially fluorinated fluorine-containing solvent (HFE) is highly safe for the skin and has low or no influence on the environment. The HFE has high solubility in a fluorine-containing oil used frequently in cosmetics and high dispersibility in fluorine compound-treated powders.


Source: www.freepatentsonline.com

Dry cleaning compositions
containing hydrofluoroether

A major concern in solvent cleaning is the tendency (especially where solvent is used at a high temperature) for solvent vapour loss from the cleaning system into the atmosphere. Although care is generally taken to minimize such losses (for example, through vapour recovery systems), most cleaning applications result in some loss of solvent vapour into the atmosphere. Furthermore, solvent cleaning methods have traditionally utilized chlorinated solvents, alone or in admixture, linked to ozone depletion.

Partially fluorinated ethers have been suggested as alternatives to chlorinated solvents. 3M Innovative Properties Company, the United States, has patented dry cleaning compositions containing hydrofluoroethers (HFEs), a co-solvent, a detergent, and water in an amount of less than 1 per cent by weight. The patent also describes a method of cleaning fabric articles using the patented dry cleaning composition. The co-solvent is selected from the group consisting of alkanols, ethers, glycol ethers, perfluoroethers, perfluorinated tertiary amines, alkanes, alkenes, perfluorocarbons, terpenes, glycol ether acetates, hydrofluorocarbons, hydrochlorofluorocarbons, non-ionic fluorinated surfactants, cycloalkanes, siloxanes, ketones and combinations thereof.

HFEs suitable for use in the process are low-polarity chemical compounds, minimally containing carbon, fluorine, hydrogen and catenary (that is, in-chain) oxygen atoms. HFEs can optionally contain additional catenary heteroatoms, such as nitrogen and sulphur. Their molecular structures can be linear, branched or cyclic, or a combination thereof. They are preferably free of ethylenic unsaturation, having a total of about 4-20 carbon atoms. Such HFEs are readily available, either as essentially pure compounds or as mixtures.

Preferred HFEs can have a boiling point in the range from about 40 to 275C, preferably 50 to 121C, and have a higher vapour pressure than that of perchloroethylene, thus increasing the dry time of the cleaned fabric. Contact: 3M Innovative Properties Company, 3M Centre, P.O. Box 33427, St. Paul, MN 55133-3427, United States of America.

Source: www.freepatentsonline.com