A kind of acrylic polyurethane topcoat and preparation method thereof
A technology of acrylic polyurethane and acrylic resin, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor hardness and poor chalk wiping resistance, and achieve clear chalk writing, good chalk wiping resistance and strong adhesion Effect
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Embodiment 1
[0064] An acrylic polyurethane topcoat comprising the following raw materials:
[0065]
[0066] The molecular weight of the acrylic resin is 3000-7000, the hydroxyl value is 50-70mgKOH / g, the acid value is 60-80mgKOH / g, the glass transition temperature is 44°C, the viscosity is 70-120s (measured by a graticule viscometer / 25°C), solid Part 59-61%, color <3.
[0067] The solid content of the blocked polyurethane resin is 60%.
[0068] The ratio of pigment to base is 0.6:1; the ratio of acrylic to polyurethane is 2.7:1.
[0069] 1) Mix 40 parts of acrylic resin, 1.0 part of dispersant, 20 parts of coloring pigment, anti-sedimentation aid and S-150 solvent oil, sand mill to obtain slurry;
[0070] 2) Add 15 parts of blocked polyurethane resin, 2 parts of organotin catalyst, 20 parts of wear-resistant filler, conventional amount of matting agent, conventional amount of wax additive and S-150 solvent oil into the slurry, and mix to obtain acrylic acid Polyurethane finish.
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Embodiment 2
[0075] A preparation method for acrylic polyurethane topcoat, comprising the following steps:
[0076] 1) Mix 50 parts of acrylic resin, 0.5 parts of dispersant, 18 parts of coloring pigment, and an appropriate amount of cyclohexanone, and sand them to obtain a slurry;
[0077] 2) Add 10 parts of blocked polyurethane resin, 1 part of catalyst, and an appropriate amount of cyclohexanone to the slurry, and mix to obtain an acrylic polyurethane topcoat.
[0078] The solid content of the acrylic resin is 60%. The solid content of the blocked polyurethane resin is 60%.
[0079] The ratio of pigment to base is 0.5:1; the ratio of acrylic to polyurethane is 5:1.
[0080] The dispersant is a high molecular weight dispersant, SOLSPERSE 32500 from AVECIA Company.
[0081] The catalyst is an organic tin catalyst.
[0082] The result is similar to Example 1.
Embodiment 3
[0084] A preparation method for acrylic polyurethane topcoat, comprising the following steps:
[0085] 1) Mix 30 parts of acrylic resin, 1.0 part of dispersant, 48 parts of coloring pigment, and appropriate amount of ethylene glycol butyl ether, and sand mill to obtain a slurry;
[0086] 2) Add 10 parts of closed polyurethane resin, 1-2 parts of catalyst, 40 parts of wear-resistant filler, and appropriate amount of butyl glycol to the slurry, and mix to obtain an acrylic polyurethane topcoat.
[0087] The solid content of the acrylic resin is 60%. The solid content of the blocked polyurethane resin is 60%.
[0088] The ratio of pigment to base is 2:1; the ratio of acrylic to polyurethane is 3:1.
[0089] The dispersant is a high molecular weight dispersant, WE D264 of Xinnuo Company.
[0090] The catalyst is an organic tin catalyst.
[0091] The wear-resistant filler is PMMA.
[0092] The result is similar to Example 1.
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Abstract
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