Modified waterborne polyurethane heat conduction paint for power distribution cabinet and preparing method thereof
A technology of water-based polyurethane and heat-conducting coatings, applied in the field of coatings, can solve the problems of poor environmental friendliness and low thermal conductivity, and achieve the effect of good adhesion and good thermal conductivity
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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 modified water-based polyurethane heat-conducting paint used for distribution cabinets includes the following components by weight:
[0043] 60 parts of modified water-based polyurethane emulsion, 4 parts of water-based alkyd resin, 5 parts of aluminum sol (solid content 15wt%), thermal conductive filler (thermal conductive filler is a mixture of aluminum nitride, glass powder, barium sulfate and titanium dioxide in equal weight ratios ) 15 parts, corrosion inhibitor 0.5 parts, dispersant 0.5 parts, defoamer 0.5 parts, wetting agent 0.5 parts, water 15 parts.
[0044] Modified water-based polyurethane emulsion refers to epoxy castor oil modified water-based polyurethane emulsion, and its preparation method comprises the steps:
[0045] 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;
[0046]Step 2, in parts by weight, mix 10 parts of epoxy castor oil and 15 parts of polyet...
Embodiment 2
[0050] The modified water-based polyurethane heat-conducting paint used for distribution cabinets includes the following components by weight:
[0051] 80 parts of modified water-based polyurethane emulsion, 6 parts of water-based alkyd resin, 10 parts of aluminum sol (solid content 20wt%), thermal conductive filler (thermal conductive filler is a mixture of aluminum nitride, glass powder, barium sulfate and titanium dioxide in equal weight ratios ) 30 parts, corrosion inhibitor 3 parts, dispersant 3 parts, defoamer 3 parts, wetting agent 3 parts, water 20 parts.
[0052] Modified water-based polyurethane emulsion refers to epoxy castor oil modified water-based polyurethane emulsion, and its preparation method comprises the steps:
[0053] 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;
[0054] Step 2: Mix 15 parts of epoxy castor oil and 20 parts of polyethylene glycol in parts by ...
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