Environment-friendly fluorinated polyurethane-polyacrylate emulsion and preparation method thereof
A polyacrylate emulsion and acrylate technology, applied in the field of polymer chemistry, can solve problems such as poor stability, pollution, and unfavorable application performance of fluorine-containing emulsion products, and achieve the effects of improving water resistance, improving surface properties, and eliminating adverse effects
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[0031] The preparation method of an organic solvent-free fluorine-containing polyurethane-polyacrylate emulsion of the present invention includes the following steps:
[0032] (1) Mix 5-10 parts of vinyl monomer, 0.5-2.5 parts of fluorine-containing methacrylate or fluorine-containing acrylate to obtain solution A;
[0033] (2) Add 1.5 to 2 parts of polyol, 7 to 9 parts of diisocyanate compound, 1 to 2 parts of anionic hydrophilic chain extender, and 0 to 0.095 parts of catalyst in solution A. The reaction temperature is 70 to 85°C, and the reaction time is After 2 to 4 hours, polyurethane prepolymer solution B is obtained;
[0034] (3) Then, add 1 to 4 parts of hydrophilic vinyl monomer to solution B for end-capping, react for 0.5 to 2 hours, then cool the temperature of the system to 30 to 50°C, and then add 0.8-1.9 parts of organic Alkali, neutralize the reaction for 20-30 minutes, then add 60-100 parts of a small molecule post-chain extender aqueous solution with a concentration...
Example Embodiment
[0037] Example 1:
[0038] Mix 6 parts of methyl methacrylate, 4 parts of butyl acrylate, and 2.5 parts of perfluorooctyl ethyl acrylate to prepare solution A; add 1.5 parts of polycaprolactone diol and 7 parts of isoform to solution A Phosphorone diisocyanate compound, 1.5 parts of anionic hydrophilic chain extender dimethylolbutyric acid and 0.05 parts of catalyst dibutyltin dilaurate, reaction temperature of 70℃, reaction time of 4 hours to obtain polyurethane prepolymer solution B; Then, add 1 part of hydrophilic vinyl monomer hydroxyethyl acrylate to the solution B for end-capping, react for 1 hour, then cool the system temperature to 30°C, and add 1.4 parts of organic base triethylamine to neutralize React for 30 minutes, then add 60 parts of sodium ethylenediamine ethanesulfonate aqueous solution with a concentration of 1%, stir and disperse at high speed for 30 minutes to obtain polyurethane dispersion C; add water-soluble initiator ammonium persulfate to dispersion C to ...
Example Embodiment
[0039] Example 2:
[0040] Mix 5 parts of methyl acrylate, 4.5 parts of ethyl methacrylate, and 2 parts of dodecafluoroheptyl acrylate to prepare solution A; add 2 parts of polyhexanediol adipate and 9 parts of toluene to solution A Isocyanate, 2 parts of anionic hydrophilic chain extender dimethylolpropionic acid and 0.095 parts of catalyst dibutyltin diacetate, the reaction temperature is 75℃, and the reaction time is 3 hours to obtain polyurethane prepolymer solution B; then, in solution B Add 4 parts of hydrophilic vinyl monomer hydroxyethyl methacrylate for end-capping, react for 0.5 hours, then cool the system temperature to 35°C, add 1.9 parts of organic base trimethylamine, neutralize for 30 minutes, and then Add 100 parts of sodium ethylenediamine di-o-phenylacetate aqueous solution with a concentration of 1.5%, stir and disperse at high speed for 40 minutes to obtain polyurethane dispersion C; add water-soluble initiator potassium persulfate to dispersion C, dispersion ...
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