Technical article: formaldehyde donor biocides — what’s the future?
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‘Formaldehyde donor biocides — what’s the future?’
With the impending reclassification of formaldehyde as a category 1B, presumed human carcinogen, the writing is on the wall for formaldehyde donor biocides. These compounds do not contain formaldehyde per se, but as their name suggests they release it, in very small amounts, in the process of killing bacteria. Formaldehyde donors are proven, stable and effective and for many years have been the preservatives of choice for the majority of metalworking fluid manufacturers. However, the new regulation may change that. According to Master Chemical, this reclassification emphasises why the research and development (R&D) of alternative metalworking fluids is so vital. Formulators who are completely reliant on old chemistry are certain to lose market share as those with a high commitment to R&D introduce next-generation products that are future proof.
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Tramp oils, oils in a metalworking system (by other than intent), are major contributors to metalworking fluid failure. Typically, these oils come from machine way, spindle, gearbox or hydraulic lubes, cutting oils or rust preventives carried into the machine from previous operations. The adverse effects of tramp oil are proportional to the amount of tramp oil present and are also affected by the type of the tramp oil and the fluid that they are mixed with. The problems are most pronounced ...
Amines, particularly triethanolamine (TEA) and monoethanolamine (MEA) have remained basic building blocks of metalworking fluids, washing compounds, and rust inhibitors. This article from Master Chemical provides further information on the topic.
This technical bulletin from Master Chemical focuses on minimum quantity lubrication (MQL). MQL is micro lubrication near dry machining, or ‘spatter’ lubrication; it could be considered the latest method of delivering metalworking fluids to the point of cut, or just the logical continuation of the age-old technique of ‘brushing on’ a lubricant where it is needed.
Because of the nature of metalworking fluids and the environment that they are used in, a certain amount of microbiological growth is inevitable. So the question is not one of ‘How do I run a system where there is no microbiological growth?’ (or growth below some arbitrary level), but rather ‘How do I control the microbiological growth below a level where it causes a problem?’ This technical article from Master Chemical lists some of the metalworking fluid problems where microbiological ...
The chemical industry is rife with examples of two hazardous chemicals coming together to produce an innocuous and useful chemical, such as chlorine and sodium-producing table salt or hydrogen- and oxygen-producing water. Conversely, when ‘safe’ chemicals are combined, they can produce a hazardous chemical, such as water- and sulphur-producing sulphuric acid.