Paper base printing circuit board with protective layer and preparation method thereof
A printed circuit board and printed circuit technology, which is applied to printed circuit parts, printed circuit secondary treatment, non-metallic protective layer coating, etc., can solve problems such as key failure, improve reliability, simple production process, avoid The effect of micro-short circuit phenomenon
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[0043] Example one
[0044] A paper-based printed circuit board with a protective layer includes a paper-based printed circuit board with electronic components and a protective layer. The protective layer is a conformal coating. The components and content of the conformal coating are: siloxane grafted polyurethane-polyacrylate (PUA) 56%, siloxane modified acrylate 34%, photoinitiator 1173 (2-hydroxy-2-methylbenzene) Base acetone-1) 6.0%, coupling agent dibutyl tin dilaurate 0.5%, leveling agent polysiloxane-polyether copolymer 0.5%, defoaming agent dimethyl polysiloxane 2.25%, wetting agent Cross-linked silicone polyether acrylate 0.25%.
[0045] Such as figure 1 As shown, the paper-based printed circuit board with a protective layer is manufactured through the following steps: (1) The electronic components are fixed on the empty paper-based printed circuit board by wave soldering to obtain a paper-based printed circuit board with electronic components (2) Coating the conformal ...
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[0049] Example two
[0050] Compared with Example 1, the difference of this example is that the component content of the conformal coating is different: siloxane grafted polyurethane-polyacrylate (PUA) 61%, siloxane modified acrylate 35%, Photoinitiator 1173 (2-hydroxy-2-methylphenylacetone-1) 3.0%, coupling agent dibutyltin dilaurate 0.5%, leveling agent polysiloxane-polyether copolymer 0.1%, defoamer Dimethyl polysiloxane 0.2%, wetting agent cross-linked silicone polyether acrylate 0.2%.
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