Bonding Plastics and Dissimilar Substrates
Solvent-free adhesive bonding (joining) of plastics with light curable adhesives can vary from a relatively simple process to something that is extremely challenging. Variables such as component configuration, molding humidity, surface energy, light transmission, and operating environment all influence which adhesive and bonding process best suits the application. On occasion, additional processes must be incorporated to mitigate some of these variables. For example, the bonding of plastics with low surface energy may require a pre-treatment process using plasma or corona discharge. Increasing surface energy improves the substrate’s “wettability”, which can dramatically improve adhesive bond strength.
The pioneering adhesive formulators at Tangent Industries have found methods to create more robust adhesives that possess greater cohesive strength with improved adhesion to a broader array of plastic substrates. Tangent’s expertise in light curable adhesives has led to the development of much desired soft, flexible adhesives that can be cured under low intensity UV and UV/Visible light. Despite using lower light intensity, Tangent’s adhesives fully cure in seconds, and exhibit dry, tack-free surfaces. These low intensity curable adhesives are part of Tangent’s LEDcure product line.
Tangent’s adhesives for plastic bonding can be cured with UV, UV/Visible, or only Visible light wavelengths. High strength bonds are achieved with a wide variety of substrates, including combinations of polycarbonate, acrylic, ABS, polyurethane, polyethylene, stainless steel, and glass. They are well suited for assembling consumer appliances and electronics, screens and displays, product packaging, and a host of other applications involving combinations of plastics, metals and glass.
The following table provides a quick summary of our selection of light curable adhesives best suited for plastics and dissimilar materials assembly. In the event that these standard products do not satisfactorily address your performance requirements, Tangent will investigate other solutions that include adhesive development specifically tailored to the complexity of your application.
|Product Number||Suitable Applications||Viscosity cP mPa||Shore Durometer||24 Hour Water Absorbtion||LEDcure||Bondable Substrates||Comments/Features||Request
|bonding plastics with multiple dissimilar materials||1000-2500||D25-35||< 1.0%||yes||plastics, ceramic, glass,stainless steel||UV/Visible cure, flexible, high elongation, tack-free surface|
|bonding plastics with multiple dissimilar materials||900–1500||D35-50||< 1.0%||yes||most plastics, ceramic, glass, stainless steel||UV/Visible cure, clear, tack-free surface, suitable for medical device assembly|
|bonding/laminating flexible materials and those with differing CTE values||250-500||A45-65||< 1.0%||yes||wide range of plastics, ceramic, glass,stainless steel||UV/Visible cure, extremely soft, highly flexible, tack-free surface, clear, suitable for medical device assembly|
|bonding or sealing acrylic displays||50-90||D70-90||3.0%||Yes||PMMA, PC, styrene, stainless steel||UV/Visible light curable, hard, tack-free surface, wicking viscosity, moisture resistant|
|bonding or sealing acrylic displays||8,000-16,000||D70-90||3.0%||Yes||PMMA, PC, styrene, stainless steel||UV/Visible light curable, hard, tack-free surface, high viscosity for gap-filling, moisture resistant|
|bonding or forming a seal between surfaces||500-900||D25-35||< 1.0%||yes||PU, PVC, other plastics, stainless steel, ceramic||UV/Visible cure, soft, flexible, high elogation, soft, waxy surface|
|needle/syringe assembly||50-150||D70-80||< 3.0%||yes||stainless steel, polycarbonate, PVC, treated polypropylene/HDPE||UV/Visible cure, low intensity curable, clear, moisture resistant, generates highest tensile strength with LED curing equipment, tack-free|
|bonding/potting rigid plastics||10-150||D80-90||< 1.0%||yes||PC, PVC, polyester, other rigid plastics||UV/Visible cure, secondary thermal cure, low intensity curable, wicking grade viscosity, withstands autoclaving, very hard, clear, suitable for medical device assembly|
|bonding PVC and polyethylene components||200-300||D70-79||< 4.0%||yes||PVC, PC, other plastics||UV/Visible cure, best for highly plasticized PVC, tack-free surface, suitable for medical device assembly|
|bonding combinations or rigid and flexible plastic||1000-2000||A60-80||< 10.0%||yes||PVC, PC, polyester, other plastics||UV/Visible cure, low intensity curable, high peel strength, soft, flexible, fluorescing, resitant to salt spray and thermal cycling|
|bonding rigid plastics||1300-2000||D80-90||< 1.0%||yes||PC, PVC, styrene, some metals||UV/Visible cure, low intensity curable, clear and very hard, highly resistant to yellowing and moisture|
|bonding rigid plastics||1300-2000||D80-90||< 1.0%||yes||PC, PVC, other plastics||UV/Visible cure, low intensity curable, tack-free surface, fluorescing, suitable for medical device assembly|
|bonding or coating rigid plastics||1300-2000||D80-90||< 1.0%||yes||PVC,PC, other plastic||UV/Visible cure, low intensity curable, modified for better wetting, very hard, tack-free|
|bonding or sealing acrylic displays||100-300||D70-90||< 9.0%||yes||PMMA, PC, other plastics||UV/Visible cure, low intensity curable,high tensile strength, low viscosity for capillary flow|
|reservoir assembly/plastics bonding||3000-5000||D45-55||< 5.0%||yes||PC, ABS, PVC, polyester||UV/Visible cure, clear, moisture resistant, flexible, tack-free, suitable for medical device assembly|
|bonding/laminating of flexible plastics||100-200||D40-50||< 2.0%||no||PE, Mylar, PVC, PC, polyester, other plastics, and stainless||UV cure, very flexible, clear, excellent for strain relief and lamination, high peel strength, UV/Visible cure version available, suitable for medical device assembly|
*Note: viscosity variations are typically available, or can be formulated, for all listed products. Please inquire with Tangent Applications Engineering for viscosity ranges not shown in the table.
Contact Tangent Industries for more info.