Conductive adhesive compositions with electrical stability and good impact resistance for use in electronics devices
A composition and conductive technology, applied in the field of interconnected compositions, can solve the problems of poor impact resistance of conductive adhesives
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Embodiment 1
[0036] Example 1. Preparation of samples of prepolymers and samples of epoxy-amine system physical mixtures. A physical mixture of epoxy resin and amine (component A) was prepared by adding 55.56% by weight of a diglycidyl ether of bisphenol-A and a diglycidyl ether of bisphenol-F (from Tohto Kasei Co. .A mixture of commercially available ZS1059) and 44.44% by weight of poly(oxy(methyl-1,2-ethanediyl), α-(2-aminomethylethyl)ω-2(2-amino Methylethoxy) (commercially available as Jeffamine® D-2000 from Huntsman Petrochemical Co.). The prepolymer (component B) was obtained by heating the physical mixture in a conventional oven at 120° C. for 6 hours .Components A and B were detected with IR spectroscopy and component B was at a wavelength of 3439em -1 Absorption peaks are shown at , which indicates the presence of hydroxyl functional groups in the sample. Component A does not have a wavelength of 3439cm -1 shows an absorption peak at , which indicates the absence of hydroxyl fun...
Embodiment 2
[0041] Example 2. Examination of the initial contact resistance of conductive adhesives by five different adhesive formulations catalyzed by imidazole and containing epoxy-aliphatic amine prepolymer. Formulation The formulation was prepared by first dissolving Novolac 1166 in gamma-butyrolactone at 120°C. The solution was cooled to room temperature and the remaining ingredients were added and mixed thoroughly with a mechanical stirrer. The composition of the formulation is shown in Table 2.
[0042] components
Formula A
Formula B
Formula C
Formula D
Formula E
Novolac 1166
0.72
0.72
0.61
0.61
0.72
γ-butyrolactone
5.62
5.62
4.75
4.75
5.62
Component B
14.06
14.06
11.78
11.88
14.06
4-Methyl-2-phenylimidazole
0.72
0.72
0.60
0.60
0.72
8-Hydroxyquinoline
1.30
1.30
1.10
1.10
...
Embodiment 3
[0048] Embodiment 3. Prepare two other samples according to the same method as the sample of Example 2, and their formulations are shown in Table 5.
[0049] components
[0050] After the coupons were formulated and placed on the plate, the initial contact resistance was measured. The panels were then placed in a humid chamber maintained at 85°C and 85% relative humidity, and the contact resistance was measured periodically with a Keithley 2010 multimeter. As shown in Figure 1, the change in resistance value of the sample without any corrosion inhibitor is more obvious. Also, when imidazole was used as a catalyst and a corrosion inhibitor was added to the formulation, the resistance was much more stable in conditions of high temperature and high humidity.
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