Waterborne polyurethane for pigment dyeing and preparation method thereof
A water-based polyurethane and paint dyeing technology, which is applied in the direction of polyurea/polyurethane paint, coating, etc., can solve the problems of poor coating fastness of coating materials, unstable polyurethane, and hard hand feeling of coating materials, so as to achieve easy dyeing , good color fastness, little effect on hand feel
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Example Embodiment
[0036] The second aspect of the examples of this application shows a preparation method of water-based polyurethane for paint dyeing, please refer to figure 1 , the method includes:
[0037] S101 Weigh polytetramethylene ether glycol: 2 parts by mass to 5 parts by mass; polycarbon polyol: 10 parts by mass to 15 parts by mass; hexamethylene diisocyanate: 40 parts by mass to 74 parts by mass, add a solvent In the reactor, a prepolymerization reaction occurs, and the reaction is performed for 2 hours, and then the solvent is removed to obtain a prepolymerization reaction product;
[0038] S102 Add 2-10 parts by mass of monoethanolamine to the pre-polymerization reaction product, add the pH regulator: 0.1-1 mass part, add the pre-polymerization reaction product, adjust the pH of the pre-polymerization reaction product to 4.0-5.0, and obtain the acid Neutralize the polymerization reaction product;
[0039] S103 neutralizes the surfactant in the polymerization reaction product wit...
Example Embodiment
[0049] Example 1:
[0050] Weigh polytetramethylene ether glycol: 2 parts by mass; polycarbon polyol: 10 parts by mass; hexamethylene diisocyanate: 42 parts by mass, the solvent is added to the reactor at a reaction temperature of 80°C, and a prepolymerization reaction occurs, The reaction is carried out for 2 hours, and then the solvent is removed, and the temperature of the solvent removal is 120°C to obtain a prepolymerized reaction product;
[0051] 2 parts by mass of monoethanolamine are added to the prepolymerization reaction product, and the pH regulator: 0.1 mass part is added to the prepolymerization reaction product, and the pH of the prepolymerization reaction product is adjusted to 4.0 to obtain an acid neutralization polymerization reaction product;
[0052] The surfactant in the polymerization reaction product is neutralized with acid, fully stirred evenly, and the stirring speed is 1500 r / min to obtain the water-based polyurethane for paint dyeing.
Example Embodiment
[0053] Example 2:
[0054] Weigh polytetramethylene ether glycol: 5 parts by mass; polycarbon polyol: 15 parts by mass; hexamethylene diisocyanate: 74 parts by mass, the solvent is added to the reactor at a reaction temperature of 100°C, and a prepolymerization reaction occurs, The reaction is carried out for 2 hours, and then the solvent is removed, and the temperature of the solvent removal is 150 °C to obtain a prepolymerized reaction product;
[0055] Add 10 parts by mass of monoethanolamine to the prepolymerized reaction product, add 1 mass part of a pH regulator, add the prepolymerized reaction product, adjust the pH of the prepolymerized reaction product to 4.0-5.0, and obtain an acid neutralization polymerization reaction product;
[0056] S103 neutralizes the surfactant in the polymerization reaction product with acid, fully stirs it evenly, and the stirring speed is 2000 r / min to obtain the water-based polyurethane for paint dyeing.
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