Matt waterborne polyurethane material and preparation method thereof
A water-based polyurethane, matte technology, applied in the field of water-based polyurethane materials, can solve the problems of decreased coating performance, reduced coating film transparency, poor coating resistance to polishing, etc., to achieve stable emulsion performance, avoid whitening and yellowing, and excellent The effect of mechanical properties
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Embodiment 1
[0027] Weigh each raw material according to the table below.
[0028]
[0029]
[0030] Preparation of matte water-based polyurethane material:
[0031] (1) Preparation of prepolymer: Add macromolecular polyol and small molecule chain extender to a four-neck flask, stir evenly, heat up to 90-100°C for vacuum dehydration for 1 hour, cool down to 60°C, add diisocyanate at one time, and then drop Add 2 drops of catalyst, stir, keep warm at 75°C for 2 hours, then add a small molecule hydrophilic compound, drop 1 drop of catalyst, keep warm for 2 hours, cool down to below 50°C, slowly add neutralizer dropwise, stir evenly, and get water-based Polyurethane prepolymer;
[0032] (2) Preparation of anionic emulsifier aqueous solution: take anionic emulsifier and dissolve it in deionized water, stir evenly to obtain anionic emulsifier aqueous solution;
[0033] (3) Prepolymer dispersion and chain extension: quickly pour the water-based polyurethane prepolymer into the anionic em...
Embodiment 2
[0035] Weigh each raw material according to the table below.
[0036]
[0037]
[0038] The preparation method of the matte water-based polyurethane material of this embodiment is the same as that of Embodiment 1.
Embodiment 3
[0040] Weigh each raw material according to the table below.
[0041] raw material
[0042] The preparation method of the matte water-based polyurethane material of this embodiment is the same as that of Embodiment 1.
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