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Industrial Technologies
SterilTR Industrial Technologies

Rheological Characterization of UV-Curing Materials by Using UV-Curing System

Ultraviolet (UV) and electron beam (EB) curing are emerging technologies with exciting potential for use in many different industries. One useful feature of UV/EB-sensitive products is that they can be applied to nearly any surface. Also, these materials can be processed in different ways, from simple dipping applications to use in sophisticated processing equipment.

 Ultraviolet (UV) and electron beam (EB) curing are emerging technologies with exciting potential for use in many different industries. One useful feature of UV/EB-sensitive products is that they can be applied to nearly any surface. Also, these materials can be processed in different ways, from simple dipping applications to use in sophisticated processing equipment. There are two advantages to UV/ EB coatings:

• Energy savings,

• Reduced chemical use.

Processes can be re-designed to reduce the required amounts of heat or solvents. In addition, these processes are fast, which can increase processing speeds and improve productivity. Industries that use these curing materials include, but are not limited to, adhesives, abrasives, coatings, flooring, wood finishing, packaging, printing, electronics, and medical applications.

By means of various accessories of Anton Paar rheometers provide opportunity to special applications like UV curing materials which contains UV sensitive components. Since the cell is attached to a standard rotational research rheometer, all tests that instrument performs are available for experiments using the UV system. Film thickness, temperature and UV light intencity dependence of curing behavior can also be investigated by UV Curing Cell.

For instance, highly essential UV adhesives could be characterized by using UV Curing Cell. Adhesives provide cohesion for products that consist of several parts and materials. In accordance with DIN 16980, bonding is defined as the non-detachable connection / joining of identical or different materials.

This is achieved with a substance inserted between or applied to the surface of two materials. Two types of curing can be discerned by their mode of action: physical curing and curing through a chemical reaction. UV adhesives are single - component adhesives that cure in a chemical reaction initiated by UV light. UV adhesives are used for

• The construction of showcases (gluing the panes to the showcase frame),

• The electrical industry,

• The automotive industry (glass connections),

• The medical industry (medical disposables such as adhesion of catheters, hose systems, syringes),

• The optical industry (alignment and lamination of lenses),

• The fiberoptics industry (adhesion of fibers, LED, OLED, LCD) and numerous other applications.

UV-curing adhesives exceed traditional adhesives in their fast curing, low surface heating of the substrates and immediate reprocessability, hence allowing high rates of production. MCR rheometers, the Peltier controlled measuring chamber with glass plate and an upper parallel measuring geometry the curing behavior of UV adhesives could be characterized at different UV light intensities.

UV light intensity dependence of a UV adhesive can be seen in Figure 1. As expected, the UV adhesive showed slower curing at a lower UV irradiation than at a higher irradiation. This was clearly shown by applying the storage modulus G’ and the loss modulus G’’ as well as the loss factor after 15 seconds of UV irradiation to the UV intensity.

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