Visible light curing systems, methods for reducing health risks to individuals exposed to systems designed to cure curable compositions by exposure to radiation, methods for bonding substrates and vis
A composition, technology of radiation rays, applied in the direction of bonding methods, chemical/physical/physicochemical processes of applied energy, adhesives, etc.
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Embodiment 1
[0054] In this example, several photoinitiators were evaluated within otherwise comparable sample formulations. The following samples were prepared from the ingredients listed in Table 1 and mixed in a DAC 4000FVZ speed mixer.
Table 1
[0055] The resulting samples were characterized using three basic techniques: surface tack, sticky block shear adhesion, and color.
[0056] Surface tack was rated on a scale of 1-5, with 5 being non-tacky, and the description of the scale is as follows:
1. Completely uncured
2. Gel body, uncured surface
3. Cured body; leaves residue on glove upper surface when touched and typically retains all silicon carbide grit ("SiC") when dusted
4. No residue is left on the surface, but it feels tacky and typically retains 50-60% of SiC
5. The surface is dry, non-tacky and retains ≤ 10% SiC.
[0057]Using polycarbonate samples (1 x 1 x 1 / 4 inches), measure sticky block shear bond (or shear bond strength); without induced gap and at 1 / 2 inc...
Embodiment 2
[0060] In this example, several photoinitiator synergists were evaluated within otherwise comparable sample formulations. The following samples were prepared from the ingredients described in Table 3 and mixed in a DAC 400FVZ speed mixer.
table 3
[0061] As in Example 1, surface tack, block shear strength to polycarbonate substrate and color were evaluated and the results are shown in Table 4 below.
Table 4
* Surface tack: 5.0 = completely dry and non-tacky, 3.0 = minimally acceptable tack, 1.0 = very sticky / liquid surface. The samples were cured with a 465 nm light emitting diode (LED) at an intensity of 500 mW / cm2.
**Polycarbonate block shear samples were cured with 470 nm light emitting diodes (LEDs) at an intensity of 500 mW / cm2.
***Color Rating: 5.0 = completely colorless, 3.0 = maximally pigmented, still acceptable.
[0062] These results indicate that in order to achieve a balance of surface tack, shear bond strength on polycarbonate substrates greate...
Embodiment 3
[0063] Several reactive diluents were evaluated in this example in otherwise comparable sample formulations. The following examples were prepared from the ingredients described in Table 5 and mixed in a DAC 4000FVZ speed mixer.
table 5
[0064] As in Example 1, surface tack, block shear strength to polycarbonate substrates and color were evaluated and the results are shown in Table 6 below.
Table 6
* Surface tack: 5.0 = completely dry and non-tacky, 3.0 = minimally acceptable tack, 1.0 = very sticky / liquid surface. The samples were cured with a 465 nm light emitting diode (LED) at an intensity of 500 mW / cm2.
* 1 Surface Tack: Samples were cured with LOCTITE 7420 (metal halide light shielded from UV light) at 65 mW / cm2 for 10 seconds.
**Polycarbonate block shear samples were cured with 470 nm light emitting diodes (LEDs) at an intensity of 500 mW / cm2.
***Color Rating: 5.0 = completely colorless, 3.0 = maximum acceptable coloration.
[0065] These results in...
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