Self healing silica based dielectric ink for printed electronic applications
A silicon dioxide, self-healing technology, used in printed circuits, printed circuit components, applications, etc.
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Embodiment 1
[0066] Ball milled SiO 2 The powder is 12 hours to achieve a uniform particle size, and preheated at 600°C for 4 hours to remove moisture and organic contaminants during the ball milling process. In this study, an equimolar mixture of anhydrous xylene and ethanol was used as the solvent. A two-stage method is used to prepare the dielectric colloidal ink. In the first stage, the dielectric filler SiO is ball milled with the aid of ethanol / xylene solvent 2 12 hours, where fish oil is used as a dispersant. In the second stage, polyvinyl butyral (Butvar B-98) binder is added and milled for another 12 hours. Only after the second stage of grinding is completed, the dielectric silica ink is ready to be printed.
[0067] in figure 1 Preheated SiO 2 The phase purity of the powder. Use standard ICDD file card number 01-087-2096 to index all peaks corresponding to X-ray diffraction results. Match peaks to SiO with hexagonal crystal structure 2 , Which has a primitive lattice with spac...
Embodiment 2
[0069] Through rheology and sedimentation analysis, this example illustrates the optimization of fish oil. The filler was ball milled for 12 hours in a solvent with the aid of a dispersant. A rheometer was used to measure the shear viscosity of the resulting colloidal mixture. The viscosity of a well-dispersed colloidal mixture is low and still maintains the average viscosity for screen printing, ie> 2Pa.s. image 3 Shows the viscosity change with the shear rate of the colloidal mixture, where the colloidal mixture is for different amounts of fish oil dispersant by loading 35vol.% SiO in the ethanol / xylene organic carrier 2 Prepared. The viscosity of the colloidal mixture decreases as the shear rate increases and maintains the pseudoplastic properties of the screen printing ink.
[0070] For sedimentation analysis, transfer 10 ml of colloidal mixture to a graduated cylinder and allow to settle. Then measure the sediment height (H) at regular time intervals and calculate the rat...
Embodiment 3
[0072] This example illustrates the filler and binder optimization of dielectric silica ink. During the first stage, the volume ratio between filler and solvent is 35:65. Relative to the filler loading, 1-3 wt.% and 4-7 wt.% of dispersant and binder are added respectively. Relative to a fixed content of dispersant and binder, rheological studies were performed under different filler loadings ranging from 20 to 35 vol.%. In order to optimize rheological properties, the concentration of dispersant (fish oil) and binder (PVB) is arbitrarily fixed relative to the filler loading. in Figure 5 The shear thinning behavior of the colloidal dielectric ink can be observed in, which shows the change in viscosity with respect to the shear rate. The conclusion of this study is that the maximum load of the filler is only 35 vol.% and any further increase in filler content may cause clogging. The well-known polymer polyvinyl butyral (PVB) is used as an adhesive, which satisfies the quality...
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