Ultraviolet-curable waterborne polyurethane emulsion as well as preparation method and application thereof
A water-based polyurethane, ultraviolet light technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of low strength, low hardness, easy hydrolysis of ester bonds, poor product performance, etc., to achieve good hardness, wear resistance and scratch resistance. High damage and the effect of reducing the viscosity of the system
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[0040] Example 1
[0041] The preparation of the UV curable waterborne polyurethane emulsion in this embodiment includes the following steps:
[0042] 1) In parts by mass, take 60 parts of polypropylene carbonate diol with a molecular weight of 2000 and a hydroxyl functionality of 2, and add 25 parts of isophorone diisocyanate and 4.5 parts of dimethylol after vacuum dehydration at high temperature Propionic acid and 0.12 parts of stannous octoate were subjected to the first reaction at 85°C for 4 hours to obtain an intermediate.
[0043] 2) The temperature is lowered to 70°C, 1.9 parts of 1,4-butanediol is added as a chain extender to the intermediate, and the second reaction is performed for 0.5 hours at the temperature to obtain a polyurethane prepolymer.
[0044] 3) Cool down to 65°C, add 16 parts of reactive monomer hydroxyethyl methacrylate and 0.02 parts of 2,2,6,6-tetramethylpiperidine oxide (TEMPO) to the polyurethane prepolymer, keep warm The third reaction for 2 hours, the...
Example Embodiment
[0045] Example 2
[0046] The preparation of the UV curable waterborne polyurethane emulsion in this embodiment includes the following steps:
[0047] 1) In parts by mass, take 60 parts of polypropylene carbonate diol with a molecular weight of 2000 and a hydroxyl functionality of 2, and add 25 parts of isophorone diisocyanate and 4.5 parts of dimethylol after vacuum dehydration at high temperature Propionic acid and 0.12 parts of stannous octoate were subjected to the first reaction at 85°C for 4 hours to obtain an intermediate.
[0048] 2) The temperature is lowered to 70°C, 1.9 parts of 1,4-butanediol is added as a chain extender to the intermediate, and the second reaction is performed for 0.5 hours at the temperature to obtain a polyurethane prepolymer.
[0049] 3) Cool down to 65°C, add 11 parts of reactive monomer glycerol dimethacrylate and 0.02 parts of polymerization inhibitor to the polyurethane prepolymer, keep it warm for 2 hours for the third reaction, cool to 45°C, add ...
Example Embodiment
[0050] Example 3
[0051] The preparation of the UV curable waterborne polyurethane emulsion in this embodiment includes the following steps:
[0052] 1) In parts by mass, take 60 parts of polypropylene carbonate diol with a molecular weight of 2000 and a hydroxyl functionality of 2, and add 25 parts of isophorone diisocyanate and 4.5 parts of dimethylol after vacuum dehydration at high temperature Propionic acid and 0.12 parts of stannous octoate were subjected to the first reaction at 85°C for 4 hours to obtain an intermediate.
[0053] 2) The temperature is lowered to 70°C, 1.9 parts of 1,4-butanediol is added as a chain extender to the intermediate, and the second reaction is performed for 0.5 hours at the temperature to obtain a polyurethane prepolymer.
[0054] 3) Cool down to 65°C, add 14 parts of reactive monomer pentaerythritol triacrylate and 0.02 parts of polymerization inhibitor to the polyurethane prepolymer, keep it warm for 2 hours for the third reaction, cool down to 4...
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