Water-based polyurethane flame-retardant coating used on circuit board and preparation method of water-based polyurethane flame-retardant coating
A water-based polyurethane and flame-retardant coating technology, which is applied in polyurea/polyurethane coatings, fire-resistant coatings, coatings, etc., can solve the problems that flame-retardant coatings are not water-based materials, environmental pollution, etc., and achieve good flame-retardant effects
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[0027] Wherein, the modified water-based polyurethane emulsion that adopts refers to epoxy castor oil modified water-based polyurethane emulsion, and its preparation method comprises the steps:
[0028] Step 1, in parts by weight, dissolving 15-20 parts of alicyclic polyisocyanate in 20-25 parts of ester solvents to obtain the first mixture;
[0029] Step 2: In parts by weight, mix 10-15 parts of epoxy castor oil and 15-20 parts of polyethylene glycol, heat up to 65-70°C, preheat for 10-15 minutes, and then add the first mixture dropwise. Carry out the reaction, react for 20-30 minutes, then add 5-10 parts of organic polybasic acid dropwise, react for 20-30 minutes, then add 0.2-0.4 parts of organotin catalyst, raise the temperature to 75-80°C, and carry out the reaction for 2-3 hours;
[0030] Step 3: Add 3-5 parts of chain extender to the reactant obtained in Step 2, and continue the reaction at 60-65°C for 0.5-1h. After cooling to room temperature, add 0.3-0.5 parts of diet...
Embodiment 1
[0042] The water-based polyurethane flame-retardant coating is made of the following components by weight: 60 parts of modified water-based polyurethane emulsion, 4 parts of water-based alkyd resin, flame retardant (brominated polystyrene and antimony trioxide according to 1:2 weight ratio) 15 parts, thermal conductive filler (a mixture of aluminum nitride, glass powder, barium sulfate and titanium dioxide in equal weight ratio) 5 parts, 3 parts of methyl cellulose, 0.5 parts of corrosion inhibitor, dispersed 0.5 parts of agent, 0.5 parts of defoamer, 0.5 parts of wetting agent, and 15 parts of water.
[0043] Modified water-based polyurethane emulsion refers to epoxy castor oil modified water-based polyurethane emulsion, and its preparation method comprises the steps:
[0044] Step 1, in parts by weight, dissolving 15 parts of cis-1,2-cyclohexane diisocyanate in 20 parts of ethyl acetate to obtain the first mixture;
[0045] Step 2, in parts by weight, mix 10 parts of epoxy ca...
Embodiment 2
[0049] The water-based polyurethane flame-retardant coating is made of the following components by weight: 80 parts of modified water-based polyurethane emulsion, 6 parts of water-based alkyd resin, flame retardant (brominated polystyrene and antimony trioxide according to 1:2 weight ratio mixed) 20 parts, thermal conductive filler (a mixture of aluminum nitride, glass powder, barium sulfate and titanium dioxide in equal weight ratio) 9 parts, methyl cellulose 6 parts, corrosion inhibitor 3 parts, dispersed 3 parts of agent, 3 parts of defoamer, 3 parts of wetting agent, 20 parts of water.
[0050] Modified water-based polyurethane emulsion refers to epoxy castor oil modified water-based polyurethane emulsion, and its preparation method comprises the steps:
[0051] Step 1, in parts by weight, dissolving 20 parts of cis-1,2-cyclohexane diisocyanate in 25 parts of ethyl acetate to obtain the first mixture;
[0052] Step 2: Mix 15 parts of epoxy castor oil and 20 parts of polye...
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