16.02.2016
Magna-Cryl 5000 is a UV curable liquid that cures to an aggressive and permanent pressure sensitive adhesive. Research chemists investigated three UV-curable PSA formulations, making four modifications to each PSA to vary performance.
Traditionally, PSA formulations have been solventborne and based upon modified rubber chemistry. Recently, Sartomer chemists investigated three UV-curable PSA formulations (Table 1), making four modifications to each PSA to vary performance for various reasons (Table 2). For base blend #3, the base formulation viscosity is higher than all of the modifications except for the addition of hydrocarbon resin, modification B.
In base blend #2, the PSA has a relatively low tack of 100-200 grams in most of the samples (only slightly higher than the first blend).
Essentially, the CN301 does seem to improve the SAFT, but for the most part has no affect on anything else – except in base blend #3 (which does not contain an oligomer). In all cases, the addition of hydrocarbon resin (S-135) yielded negative results for all physical properties.
In short, the most positive impact made by any of the additives was the addition of more monomer to the blend.
The Handbook of Sealant Technology provides an in-depth examination of sealants, reviewing their historical developments and fundamentals, adhesion theories and properties, and today’s wide range of applications. The UVA, UVB, and UVC bands can be further divided into subtypes that denote specific applications and identify the principal absorber of the radiation. In addition to type, the Engineering360 SpecSearch database allows industrial buyers to search for UV light systems by configuration, application, specifications, and features. Curing chambers are used for the curing or hardening of "dry" inks, coatings, and adhesives.
UV conveyors or continuous systems consist of a belt conveying unit, power supply and UV light source, as well as an enclosure that is open on both ends, which allows products or sheets to pass through the system. Hand held or portable UV devices are useful for repair and testing in field, laboratory, plant floor, and other settings where transportation of large systems is impractical.
Spot or wand systems are benchtop units that provide a UV beam with a small spot size for selective curing applications. Wallorceiling-mounted UV systems disinfect anair stream as UV light irradiates theair circulating through the room.
Counterfeit detection, surgery suites sterilization, room disinfector, forensics, water purifier, material processing and identification, dentist procedures.
Fast curing of UV adhesives, coatings, and inks, industrial applications including UV bonding, sealing, and encapsulating, automotive, electronic, optical, and medical device assembly industries. Curing of inks, adhesives, varnishes, coatings and electronic potting resins: Certain inks, coatings and adhesives are formulated with photoinitiators and resins, which polymerize when exposed to the correct energy and irradiance. Security: Sensitive documents such as credit cards, driver's licenses and passports may include a UV watermark.
Biology and Chemistry: Fluorescent dyes are used in biochemistry and forensics as genetic markers for research. Air and water purification: UV light is an effective tool used to change irritating pathogens, pollens, and mold spores into inert byproducts by destroying their DNA and breaking down the organic material found in indoor air.
Analyzing and Authentication: Minerals, gems, art work, collectibles, and currency can be analyzed and authenticated using UV lamps due to their fluorescent properties. Sanitary compliance and sterilization: The DNA of microorganisms can be altered when exposed to UV radiation. Solar Cell Testing: Research is underway on converting UV radiation from the sun into energy and can be used as substitute for conventional window glass. Filters can be integrated or optional and are used in analyzing and authentication applications.
Multi-direction exposure UV systems can expose a product or material to light from multiple directions. Pulsed UV light systems and products that use light emitting diodes (LEDs) as a light source.
UV curing systems use ultraviolet radiation to initiate reactions and cure adhesives, coatings and other UV curable resin products.
In all of the following experiments, the baseline was established for the unexposed material and then the shutter was opened to allow the UV light to be projected into the parallel plate geometry. In Figure 2 one notes that UV exposure causes a very rapid reaction rate and the dynamic moduli G’ and G” exhibit a crossover very quickly (on the order of a few second after UV exposure). In the next post we will discuss the impact of UV intensity and UV dosage on the rheological properties of the UV-curable acrylate pressure sensitive adhesive. Didn’t know what is the right experimental approach to get the right rheological information?


Do you have a need for an in-situ cure monitor for a thermoset process but don’t know where to start?
It was designed to be printed in-line providing the printer with the new ability to create adhesive backed film or paper stock on conventional flexographic press equipment.
Due to today’s stricter environmental-compliance regulations, these solventborne PSAs are being challenged by low-VOC, fast-curing systems such as ultraviolet (UV) and electron beam (EB). In the first variation, polybutadiene dimethacrylate was added to try and improve shear adhesion failure temperature (SAFT). Base Blend #1 Viscosity ProfileViscosity Profiles For each of the three base PSA blends, four different dilutions were made for reasons described previously. The addition of more monomers in modification D lowers the viscosity significantly where the 25 degrees C viscosity is around 1,000 cps. Base blend #1 used an aromatic urethane acrylate, whereas base blend #2 used an aliphatic urethane acrylate. However, it appears that the D modification still has the lower viscosity, with the 25 degrees C viscosity of about 290 cps. All were in the range of a Gardener Color of 5-6, except those containing the CN301 polybutadiene dimethacrylate, which is a darker oligomer. Base Blend #3 Viscosity ProfileEvaluating Tack Tack was run in a similar manner to peel adhesion, in which aging the samples shows long-term stability or lack thereof. Blend #1 Modification, 180¿ Peel AdhesionEvaluating Shear Adhesion Failure Temperature Sartomer chemists next ran SAFT tests using each of the previous blends at each of the cure conditions. Blend #3 Modification, 180¿ Peel AdhesionKey Findings of the Study These experiments were designed to help formulators determine which additives will help them achieve the specific physical characteristics needed in their UV-curable PSAs. Additional oligomer only had a positive effect in the base blend #3, which did not contain an oligomer. Besides reducing the viscosity to a printable viscosity (300-900 cps), the monomer improved the peel adhesion and tack with every blend – even improving the SAFT for base blend #1. It is a form of electromagnetic radiation with a wavelength shorter (100 - 400 nanometers) than that of visible light (400- 780nanometers), meaning that UV light is more energetic.
Excitation occurs when radiation is excited by the motion of the atoms or molecules, or causes an electron to jump from an occupied orbital into an empty, higher-energy orbital.
Ionizing radiation is used for X-rays, medical, biological and sterilization applications and is a by-product of nuclear power. The following chart provides an abridged view of the electromagnetic spectrum and divides UV light into these spectral subcategories. Also known as black light, UVA rays comprise 98% of the ultraviolet in sunlight at the Earth's surface. UVC rays have the highest energy per photon, and thus are more dangerous than UVA and UVB radiation. They consist of a power supply, light source, and enclosure or chamber that provides a work surface and shields the operator from radiation. Process or line-mounted UV systems include a power supply, light source and flange, cartridge mounting or fitting, web system, coating line, and conveyor lines or tanks that transport chemicals, plastic film, or other transparent media for processing. Currencies for many countries also include an image and multicolored fibers that are visible under ultraviolet light.
Papyruses and manuscripts can be read using UV light to distinguish ink from paper on the surface. Phototherapy is a treatment available for skin conditions like psoriasis and eczema, as well as vitamin D deficiency and certain fungal growths.
The light causes chemical reactions to occur in the photoresist material to create a pattern on a sample.
When used in conjunction with other sterilization techniques, UV light is an effective tool to sterilize laboratory workbenches and medical facilities.
Shortwave bulbs emphasize UVB and UVC while longwave bulbs are used from UVA and visible light.
Intensity decreases as the object's distance from the light increases and when curing through substrates that transmit less than 100% of the light used for curing.
This is important if the bond-to material is not transparent and shadows the adhesive from an overhead beam.
Neither the service provider nor the domain owner maintain any relationship with the advertisers. The dynamic storage moduli plotted as a function of time to demonstrate the effect of sample gap height on the UV curing reaction. Confused about what is gelation or how does vitrification impact thermoset curing profiles? Each dilution with the original base blend PSA has a viscosity profile run from room temperature to 65 degrees C.


With the third grouping, the 20 percent addition of S-135 hydrocarbon resin into the base PSA, the 180 degree peel adhesion significantly decreases.
With the third grouping, the 20 percent addition of S-135 hydrocarbon resin into the base PSA, the 180 degree peel adhesion decreases, this time with additional UV dosage reducing the 180 degree peel adhesion. Sartomer scientists reviewed all the above samples and tested tack with the aging of the samples, along with a one-month aging sample.
In the third grouping, which is the 20 percent addition of S-135 hydrocarbon resin into the base PSA, we see that tack is non-existent. The best improvement of the SAFT was seen with CN301, but it was not as good as the other two bases. Formulators looking to achieve excellent peel adhesion, increased tack and improved SAFT should review the key findings below and consider modifying their formulations accordingly. They rays are completely absorbed by the ozone layer, but can pose a serious threat if looked at for an extended period of time.
They prevent the cured item from being exposed to dust and contaminates in the air during drying. The reaction is very fast and is used in glass and plastic bonding, optical fiber coatings, dental fillings and finger nail gels.
UV lamps are also used to detect organic mineral and biological deposits that remain on surfaces, such as restrooms and bedding. In case of trademark issues please contact the domain owner directly (contact information can be found in whois). Or wondered how to measure the glass transition temperature of an epoxy or polyester composite? Again, the same trends were observed with the same modifications that are in base blend #1.
Each of the blends was fully evaluated with each of the four modifications for the 180 degree peel adhesion for 30 minutes, 24 hours and one week after UV cure. The fourth grouping evaluates the 20 percent addition of CN966J75, an aliphatic urethane acrylate oligomer.
Each of the blends was fully evaluated for tack 30 minutes, 24 hours and one week after UV cure. In the second grouping, which has the 20 percent CN301 polybutadiene dimethacrylate added into the PSA blend, tack is lower than with the base PSA blend. The addition of the CN966J75 also improved the SAFT, as expected, because it is similar to the base #2 blend.
As the following diagram shows, the energy of the wave increases as the wavelengths become shorter.
The loss of an electron can change the chemical structure and cause cell damage by mutating its genetic code. UVA can cause damage to collagen by destroying vitamin A and causing damage to keratinocytes. They damage the skin's superficial epidermis layers and play a key role in the development of skin cancer. UV curing has been shown to increase production speed, reduce reject rates, improve scratch and solvent resistance, and facilitate superior bonding. UV traps can also be used to eliminate small flying insects that are attracted to the light.
Studies have shown that excellent peel strengths have been obtained with acrylate-terminated oligomers with molecular weights ranging from 1,000 to 6,000, and glass transition temperatures ranging from -74 degrees C to 13 degrees C. The 180 degree peel adhesion has greatly improved compared to the base PSA, although again we see that the increase in dose actually decreases the 180 degree peel adhesion.
Again, the third grouping, which is the 20 percent addition of S-135 hydrocarbon resin into the base PSA, has essentially no tack. Despite its link to skin cancer, UVA rays are frequently used in tanning booths and sun lamps. For all of these PSAs, including the base PSAs, viscosity profiles, 180 degrees-peel adhesion, tack and SAFT, tests were all run to help better understand performance. As for the final group, the 20 percent addition of the SR256 (2-ethoxyethoxyethylacrylate) and SR504 (ethoxylated nonyl phenol acrylate) in a 1:1 blend, the results for the 180 degree peel adhesion are greatly improved over the base PSA. As in the case of the higher-dose sample modified with the S135, no adhesion was present to run the test.



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Comments Uv curable pressure sensitive adhesive formulation

  1. LORD_RINGS
    Parts will be mixed together to make natural appearance on wraps and allows glue gel ingredient.
  2. TM_087
    Cures, paint or adhesive, the weaker real fast , think less that.