Preparation method of self-crosslinking aqueous polyurethane for terrace
A water-based polyurethane and self-crosslinking technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor weather resistance of epoxy resin and cannot be used outdoors, and achieve the effect of improving environmental protection and saving resources
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[0011] The embodiment of the present invention provides a preparation method of self-crosslinking water-based polyurethane for flooring, which includes the following steps: the mixture formed by mixing hydrophilic macromolecular polyol and castor oil is vacuum dehydrated at a temperature of 80-100° C. The isocyanate is incubated and reacted at 50-95°C for 3-4 hours under the condition of nitrogen gas, and then added with a multifunctional hydroxyl-containing chain extender and catalyst, and incubated at 50-90°C for 3-5 hours to obtain the chain end Polyurethane prepolymers with isocyanate groups and hydrophilic groups on the molecular chain;
[0012] Cool the polyurethane prepolymer to 40-55°C, add it into the deionized water containing the neutralized amine in an equimolar amount to the hydrophilic group of the polyurethane prepolymer, and quickly shear it at a speed of 3000-3500r / min. cutting and dispersing to form a dispersion, and adding a ketone hydrazine self-crosslinkin...
Embodiment 1
[0031] This embodiment provides a preparation method of self-crosslinking waterborne polyurethane for flooring, comprising the following steps:
[0032] Take the raw materials for preparing self-crosslinking water-based polyurethane for floors as shown in the table below:
[0033] Raw material type
parts by mass
Hydrophilic Macromolecular Polyol 2000
80
Castor oil (CO)
10
Isophorone diisocyanate (IPDI)
48
Trimethylolpropane (TMP)
2
Neopentyl glycol (NPG)
5
Dibutyltin dilaurate (DBTDL)
0.04
Triethylamine (TEA)
6
Adipate dihydrazide (ADH)
18.9
Diacetone Acrylamide (DAAM)
9.5
[0034] The specific preparation process is as follows: the hydrophilic macromolecular polyol with a molecular weight of 2000 and castor oil are vacuum dehydrated at 80-100°C for 1.5 hours, lowered to room temperature, added IPDI to raise the temperature to 50-95°C, kept fo...
Embodiment 2
[0037] This embodiment provides a preparation method of self-crosslinking waterborne polyurethane for flooring, comprising the following steps:
[0038] Take the raw materials for preparing self-crosslinking water-based polyurethane for floors as shown in the table below:
[0039] Raw material type
[0040] Hydrophilic Macromolecular Polyol 2000
[0041] The specific preparation process is basically the same as that of Example 1, and reference can be made to the preparation process of Example 1.
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