Spray-coating high-strength elastic waterproof paint of polyurea and construction thereof
A waterproof coating, high-strength technology, applied in anti-fouling/underwater coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problems of insufficient strength, easy foaming, high elongation, etc., and achieve good substrate adaptability , prolong the service life and overcome the effect of insufficient strength
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Embodiment 1
[0027] Add 10 parts (parts by weight) of diisononyl phthalate and 30.4 parts (parts by weight) of polyether diol (molecular weight: 2000, hydroxyl value: 56mgKH / g) into the reaction kettle, at 90-100°C Dehydration under reduced pressure for 1-2 hours, sampling to measure the moisture content, when the moisture content reaches below 0.08%, stop dehydration. Cool to 80-85°C and maintain at this temperature range, add 4.1 parts (parts by weight) of MDI-100LL dropwise to the kettle while stirring, after the dropwise addition, continue to react at the temperature range of 80-85°C for 2 hours. Then maintain the temperature range of 80-85°C, add the remaining 55.5 parts (parts by weight) of MDI-100LL dropwise to the kettle while stirring, continue to keep warm for 2 hours after the dropwise addition, and take a sample to measure -NCO%. Cool to below 40°C, add defoamer and stir for 15 minutes, then discharge. Thus, a component A containing -NCO of 16.0% by weight was prepared.
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Embodiment 2
[0032] Mix MDI-100LL and MDI-50 uniformly in a weight ratio of 1:1 in advance to prepare polyisocyanate mixture I, which is used in the following synthesis process.
[0033] Add 8 parts (parts by weight) of diisononyl phthalate and 40.1 parts (parts by weight) of polyether diol (molecular weight: 2000, hydroxyl value: 56 mgKH / g) into the reaction kettle, at 90-100°C Dehydration under reduced pressure for 1-2 hours, sampling to measure the moisture content, when the moisture content reaches below 0.08%, stop dehydration. Cool to 80-85°C and maintain at this temperature range, add 5.14 parts (parts by weight) of polyisocyanate mixture I dropwise to the kettle while stirring, after the dropwise addition, continue to react at the temperature range of 80-85°C for 2 hours. Then maintain the temperature range of 80-85°C, add dropwise the remaining 46.76 parts (parts by weight) of the polyisocyanate mixture I to the kettle while stirring, continue the insulation reaction for 2 hours a...
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