Dampness-cured polyacrylate/polyurethane composite waterproof paint and preparation method thereof
A polyacrylate, waterproof coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor solvent resistance, poor flexibility, poor water resistance, etc., to avoid carcinogenic effects, good mechanical properties, solid high content
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Embodiment 1
[0040] The synthetic method steps of polyurethane prepolymer are as follows: add 95 parts by weight of polyether diol N220 of water removal, 5 parts by weight of polyether glycol L44 of water removal, and 18 parts by weight of toluene diisocyanate into a reaction vessel, and heat to React at 70°C for 4 hours to obtain a polyurethane prepolymer.
[0041]The synthetic method step of the polyacrylate containing isocyanate group is as follows: 80 weight parts of methyl methacrylate, 20 weight parts of hydroxyethyl methacrylate, 200 weight parts of methyl ethyl ketone, 2 weight parts of azobisisoheptanonitrile are added to In the reactor, the temperature was raised to 60° C., and the reaction was carried out for 4 hours, then 26 parts by weight of toluene diisocyanate was added, and finally methyl ethyl ketone was removed to obtain isocyanate group-containing polyacrylate.
[0042] Add 25 parts by weight of polyacrylate containing isocyanate group, 3 parts by weight of white carbon...
Embodiment 2
[0044] The steps for synthesizing the polyurethane prepolymer are as follows: Add 100 parts by weight of polyether diol N220 and 9 parts by weight of naphthalene diisocyanate into a reaction vessel, heat to 95°C, and react for 8 hours to prepare the polyurethane prepolymer .
[0045] The synthetic method step of the polyacrylate containing isocyanate group is as follows: 50 parts by weight of butyl methacrylate, 46 parts by weight of isooctyl methacrylate, 4 parts by weight of hydroxyethyl methacrylate, 200 parts by weight of 3-pentanone 2 parts by weight of azobisisobutyronitrile were added to the reactor, the temperature was raised to 80°C, and the reaction was carried out for 7 hours, then 5 parts by weight of isophorone diisocyanate was added, and 3-pentanone was finally removed to obtain isocyanate group-containing Polyacrylate.
[0046] Add 12 parts by weight of polyacrylate containing isocyanate group, 4 parts by weight of white carbon black, 4 parts by weight of silic...
Embodiment 3
[0048] The steps of the synthetic method of polyurethane prepolymer are as follows: 90 parts by weight of polyether glycol N220 for water removal, 6 parts by weight of polyether glycol N210 for water removal, 4 parts by weight of polyether glycol L44 for water removal, Add 13 parts by weight of xylylene diisocyanate into the reaction vessel, heat to 85° C., and react for 7 hours to prepare a polyurethane prepolymer.
[0049] The synthetic method step of the polyacrylate containing isocyanate group is as follows: 60 parts by weight of methyl acrylate, 34 parts by weight of isooctyl methacrylate, 6 parts by weight of hydroxypropyl methacrylate, 200 parts by weight of 2-pentanone, Add 2 parts by weight of nitrogen diisoheptanonitrile into the reactor, heat up to 68°C, react for 5 hours, then add 8 parts by weight of xylylene diisocyanate, and finally remove 2-pentanone to obtain isocyanate group-containing poly Acrylate.
[0050] Add 15 parts by weight of polyacrylate containing...
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