Water-based polyurethane solution and preparation process thereof
A water-based polyurethane and emulsion technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as environmental pollution, endangering the health of production workers, etc., and achieve the effects of protecting the environment, good water resistance, and reducing energy use
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Embodiment 1
[0014] Aqueous polyurethane emulsion, each component distribution ratio is by mass the polyester polyol of 13 parts, the dimethylol propionic acid of 1.75 parts, the isophorone diisocyanate (IPDI) of 14.5 parts, the AS-15 of 0.13 parts, 1.35 parts of 1,4-butanediol, 1.35 parts of triethylamine, 1.15 parts of ethylenediamine, 5.0 parts of N-methylpyrrolidone (NMP), 1.5 parts of acetone, 0.15 parts of dibutyltin dilaurate (DBTDL), 62.5 parts of distilled water, 13.5 parts of ammonia and 1.65 parts of SC-100. The polyester polyol is a polyester polyol with M=1000. The AS-15 is imported refined castor oil with three -OH functional groups; the SC-100 is aziridine.
[0015] The preparation process of water-based polyurethane emulsion, first vacuum dehydrate polyester polyol at 120°C for 1-2 hours, then cool down to 80°C and add isophorone diisocyanate, then raise the temperature to 90°C for 2 hours, then cool down to 80°C Add DMPA and N-methylpyrrolidone at ℃ to continue the react...
Embodiment 2
[0018] Water-based polyurethane emulsion, each component distribution ratio by mass is 14 parts of polyester polyol, 1.55 parts of dimethylol propionic acid, 13.0 parts of isophorone diisocyanate, 0.15 parts of AS-15, 1.50 parts of 1,4-butanediol, 1.50 parts of triethylamine, 1.3 parts of ethylenediamine, 6.0 parts of N-methylpyrrolidone, 1.0 parts of acetone, 0.10 parts of dibutyltin dilaurate, 61.63 parts of distilled water, 14.0 parts of ammonia and 1.8 parts of SC-100. The preparation process is the same as in Example 1.
Embodiment 3
[0020] Water-based polyurethane emulsion, each component distribution ratio by mass is 12 parts of polyester polyol, 2.0 parts of dimethylol propionic acid, 15.5 parts of isophorone diisocyanate, 0.12 parts of AS-15, 1.21 parts of 1,4-butanediol, 1.20 parts of triethylamine, 1.0 parts of ethylenediamine, 4.0 parts of N-methylpyrrolidone, 2.0 parts of acetone, 0.20 parts of dibutyltin dilaurate, 64.1 parts of distilled water, 13 parts ammonia and 1.50 parts SC-100. The preparation process is the same as in Example 1.
[0021] The water-based polyurethane emulsion of the present invention is mainly used on the surface of woodware, and requires a certain gloss and hardness, and has the characteristics of water resistance, alcohol resistance, anti-sticking and the like. 1. Gloss: 60° gloss meter is required for testing. Greater than 80; 2. Hardness: pencil hardness ≥ H; 3. Water resistance: ≥ 72h, no whitening, no foaming; 4. Alcohol resistance: 50 alcohol 2h, no foaming, no whi...
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