A high-efficiency and environment-friendly UV-moisture dual-cure conformal paint for flexible circuit boards
A flexible circuit board, environmentally friendly technology, applied in anti-corrosion coatings, fire-resistant coatings, coatings, etc., can solve the problems of non-drying of the shadow area of the circuit board, induction of occupational diseases, delamination, etc.
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[0029] In the present invention, monomers containing C=C double bonds and -NHCOO- can be purchased from the market, for example, can be selected from ethyl [2-(vinylthio) ethyl] carbamate, ethyl ( 2-methyl-4-penten-1-yl) carbamate, naphthalene-1-yl N-prop-2-enyl carbamate, 2-methyl-2-propyl[(4E) One of -6-oxo-1,4-hexadien-3-yl] carbamate, etc. It can also be prepared by reacting diisocyanate, polyol, and hydroxyalkyl acrylate as raw materials under a solvent and a catalyst. The specific preparation method includes the following steps:
[0030] Take a certain amount of diisocyanate, hydroxyalkyl acrylate (such as hydroxyethyl (meth)acrylate) and ethylene glycol, add to the reaction kettle, in the presence of a solvent (such as acetone) and a catalyst (such as dibutyltin dilaurate) 60 ° C reflux reaction for 3 hours that is.
[0031] In the present invention, polyurethane modified acrylic resin is adopted, and isocyanate reacts with moisture in the air to realize dark curing w...
Embodiment 1
[0054] Embodiment 1 provides a high-efficiency and environment-friendly UV-moisture dual-curing conformal coating for flexible circuit boards, and the preparation raw materials of the conformal coating, in parts by weight, include:
[0055]
[0056] The modified acrylic resin is a polyurethane modified acrylic resin, and its preparation method includes the following steps:
[0057] 0.1mol acrylic acid, 0.1mol ethyl(2-methyl-4-penten-1-yl)carbamate (CAS: 112476-23-0), 0.02mol N-prop-2-enylbenzyl The amide (CAS: 10283-95-1) was added to 100 mL of acetone, stirred and mixed, heated to 60° C., then 2.7 g of potassium persulfate was added, and the reaction was continued for 2 hours under reflux, and then cooled and discharged.
[0058] The active diluent is 8-hydroxyoctyl acrylate; the leveling aid is leveling aid A; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether; the wetting agent is diethylene glycol ; the flame retardant is tris(2,3-dibromoprop...
Embodiment 2
[0063] Embodiment 2 provides a high-efficiency and environment-friendly UV-moisture dual-curing conformal coating for flexible circuit boards, and the preparation raw materials of the conformal coating, in parts by weight, include:
[0064]
[0065] The modified acrylic resin is a polyurethane modified acrylic resin, and its preparation method includes the following steps:
[0066] 0.1mol acrylic acid, 0.1mol ethyl(2-methyl-4-penten-1-yl)carbamate (CAS: 112476-23-0), 0.02mol N-prop-2-enylbenzyl The amide (CAS: 10283-95-1) was added to 100 mL of acetone, stirred and mixed, heated to 60° C., then 2.7 g of potassium persulfate was added, and the reaction was continued for 2 hours under reflux, and then cooled and discharged.
[0067] The active diluent is 8-hydroxyoctyl acrylate; the leveling aid is leveling aid A; the defoaming agent is polyoxyethylene polyoxypropylene pentaerythritol ether; the wetting agent is diethylene glycol ; the flame retardant is tris(2,3-dibromoprop...
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