Low volatile monofunctional reactive diluents for radiation curable formulations

Protective encapsulant and sealing materials that cure upon delivery are desired for high volume automotive assembly. Unlike many coatings created for electronics, these materials are milimeters thick and have desirable elastomeric properties to withstand decades of stress. While the Automotive Electronics Council (AEC) stress test qualification for integrated circuits (AEC Q100, 1994) may set material temperature resistance at 150C, targets of 200C or 250C are desirable. The ideal polymer exhibits low permeability, effectively creating a barrier to moisture, chemicals, and gases that may emanate anywhere on the chassis. While conventional Buna and Viton rubbers represent a major share of gasketing to protect electronic packages, their design and manufacturing infrastructure cannot meet the pace of prototyping. Polymer compositing with reactive diluents now makes it possible to use CAD fed delivery tools that cure on-contact. Such robotic operated equipment delivers by variable syringe head design on vertical, overhead, or irregular surface contours. Sealant forms that once took months with costly quantity orders, now take seconds in the lab and on the assembly floor. Daetec has created a technology that meets these rapid assembly requirements with properties that exceed the current AEC targets. A complete process will be presented with state of the art LED fiber optic curing on the substrate. Data and application results using comparative specimens will be presented.

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Effect of Reactive Diluents and Kaolin on the Mechanical Properties of Epoxy Resin

Polymers and Polymer Composites ◽

10.1177/096739111001800905 ◽

2010 ◽

Vol 18 (9) ◽

pp. 503-510 ◽

Cited By ~ 3

Author(s):

M. Bakar ◽

J. Szymańska ◽

J. Rudecka ◽

J. Fitas

Keyword(s):

Mechanical Properties ◽

Epoxy Resin ◽

Reactive Diluents

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Evaluation of highly reactive mono-methacrylates as reactive diluents for BisGMA-based dental composites

Dental Materials ◽

10.1016/j.dental.2008.05.003 ◽

2009 ◽

Vol 25 (1) ◽

pp. 33-38 ◽

Cited By ~ 26

Author(s):

H KILAMBI ◽

N CRAMER ◽

L SCHNEIDEWIND ◽

P SHAH ◽

J STANSBURY ◽

...

Keyword(s):

Dental Composites ◽

Reactive Diluents

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Curing behaviour and mechanical properties of pigmented UV-curable epoxy acrylate coatings

Pigment & Resin Technology ◽

10.1108/prt-07-2013-0054 ◽

2014 ◽

Vol 43 (4) ◽

pp. 177-184 ◽

Cited By ~ 14

Author(s):

Pooneh Kardar ◽

Morteza Ebrahimi ◽

Saeed Bastani

Keyword(s):

Mechanical Properties ◽

Titanium Dioxide ◽

Chemical Structure ◽

Epoxy Acrylate ◽

Acrylate Monomer ◽

Uv Curable ◽

Content Type ◽

Reactive Diluents ◽

Acrylate Monomers ◽

And Storage

Purpose – The purpose of this work was to study the effect of chemical structure of reactive diluents on the curing behaviour and physical–mechanical properties of a titanium dioxide pigmented UV-curable epoxy acrylate system. Design/methodology/approach – Two different tri-functional and two different tetra-functional acrylate monomers were used as reactive diluents in the formulations. The curing behaviour of the formulations was studied by using photo-differential scanning calorimetry analysis. The rate of curing, conversion at the maximum rate and ultimate conversion for different formulations were calculated. In addition, the physical and mechanical characteristics of the cured films, including glass transition temperature and modulus, were measured by using a dynamic mechanical analysis technique. Findings – The results showed that the ultimate conversion for non-pigmented pentaerythritol triacrylate (PETA) and trimethylol propane triacrylate (TMPTA) formulations were almost similar, but the interference effect of titanium dioxide particles on the curing of the PETA formulations was found to be more considerable in comparison to the TMPTA formulations. The extent of reaction for tetra-functional acrylate monomers was considerably less than those for tri-functional acrylate monomers. The Tg and storage modulus of non-pigmented PETA, TMPTA and pentaerythritol tetraacrylate (PE4TA) formulations were almost the same and higher than that for ditrimethylol propane tetraacrylate (DiTMP4TA) formulations. However, Tg and storage modulus of pigmented tetra-functional acrylate monomer formulations were higher than those for tri-acrylate monomer formulations. Research limitations/implications – The curing conditions (temperature and UV intensity) can affect the network formation and consequently will affect on the properties of the cured films. Practical implications – The pigmented UV-curable coatings are interested for many industries such as wood and automotive industries. The reported data can be used by the formulators working in the R&D departments. In addition, the results obtained can be used by the researchers who are active in the field of structure–property relationship for UV-curable coatings. Social implications – UV-curing systems are considered as one of the most environment-friendly coatings system. Therefore, the developing of its knowledge can help to extend its usage to different applications. Originality/value – The photopolymerisation of pigmented coatings is a great challenge and is hardly investigated in the literature. Therefore, in this research, the effect of chemical structure and functionality of different multifunctional acrylate monomers on the curing behaviour of pigmented formulations was investigated.

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Effect of reactive and non-reactive diluents on thermal and mechanical properties of epoxy resin

High Performance Polymers ◽

10.1177/0954008317743307 ◽

2017 ◽

Vol 30 (10) ◽

pp. 1159-1168 ◽

Cited By ~ 8

Author(s):

Animesh Sinha ◽

Nazrul Islam Khan ◽

Subhankar Das ◽

Jiawei Zhang ◽

Sudipta Halder

Keyword(s):

Mechanical Properties ◽

Thermal Stability ◽

Fracture Toughness ◽

Tensile Strength ◽

Polyethylene Glycol ◽

Epoxy Resin ◽

Mechanical Performance ◽

Thermal And Mechanical Properties ◽

Minor Variation ◽

Reactive Diluents

The effect of reactive (polyethylene glycol) and non-reactive (toluene) diluents on thermal and mechanical properties (tensile strength, hardness and fracture toughness) of diglycidyl ether of bisphenol A epoxy resin (cured by triethylenetetramine) was investigated. The thermal stability and mechanical properties of the epoxy resin modified with reactive and non-reactive diluents at different wt% were investigated using thermo-gravimetric analyser, tensile test, hardness test and single-edge-notched bend test. A minor variation in thermal stability was observed for epoxy resin after addition of polyethylene glycol and toluene at 0.5 wt%; however, further addition of reactive and non-reactive diluents diminished the thermal stability. The addition of 10 wt% of polyethylene glycol in epoxy resin significantly enhances the tensile strength (∼12%), hardness (∼14%) and fracture toughness (∼24%) when compared to that of neat epoxy resin. In contrast, major drop in mechanical performance was observed after addition of toluene in epoxy. Furthermore, fracture surfaces were investigated under field emission scanning electron microscope to elucidate the failure mechanism.

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