ADHESIVES, GLUES AND SEALANTS
What are the cleaning agents?
Cleaning agents are chemicals materials used in the preparation of surfaces for cleaning and remove the contaminants that may exist on the surface of a material. Cleaning agents must have the following properties to use in the surface preparation:
Cleaning agents have to remove and completely eliminate all contaminants either polar or non-polar.
Cleaning agents should evaporate quickly and leave no residue
Cleaning agents should not damage the substrate, in the case of metals should not cause corrosion, in the case of plastics should not swell or produce stress-cracking .
Cleaning agents must comply with safety, health and environment regulations.
Cleaning agents are classified into two main groups:
Organic solvents can be used in the surface preparation are:
Halogenated hydrocarbons are excellent to dissolve oils and grease, as well in a very fast drying time and they leave no residue. But the damage done to our ozone layer and to our own health is the reasons why its use has stopped.
The hydrocarbons have worst cleaning features compare with halogenated hydrocarbons, but the addition of oxygen atoms in their chains improve the cleaning properties, leading to oxygenated hydrocarbons.
Oxygenated hydrocarbons that are typically used in surface preparation are alcohols, ketones, and esters.
The use of compressed gases such as CO2 can eliminate the contaminants and clean the surface in an efficient way, using the energy of the impact of CO2 as way to break down and clean the surface contaminants without the use of toxic products.
Aqueous cleaners are classified as neutral, alkaline and acids.
Neutral aqueous cleaners have a pH between 5 and 9, phosphates are used in its composition as medium to improve the adhesion, that kind of cleaner it applied by pressure or by raising the temperature of application.
The alkaline aqueous cleaners have a pH between 10 and 12. They are generally used for cleaning aluminum and applied by pressure or by raising the temperature of application.
Acidic cleaners have a pH less than 5 and are used to remove oxide films, oils; etc ... inhibitors usually are introduced in order to avoid damaging the substrate.
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