Polyurethane (PU) on rust paint with self-repairing function and preparation method thereof
A technology of rust-bearing paint and polyurethane, applied in the field of paint, to achieve the effects of good storage stability, good self-healing function and enhanced corrosion resistance
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[0039] (1) Preparation of molecular sieve:
[0040] The gel mixture was prepared by using pseudo-boehmite and orthophosphoric acid as sources of aluminum and phosphorus, and triethylamine as a template. The molar ratio of the gel mixture is Al 2 o 3 :P 2 o 5 : 1.5 Triethylamine: 120H 2 O (that is, in molar ratio, Al 2 o 3 :P 2 o 5 : Triethylamine: H 20=1:1:1.5:120). Pseudo-boehmite is first mixed with deionized water, and the mixed slurry is mechanically stirred in an autoclave for 12 hours, then the mixture of orthophosphoric acid and deionized water is added to the mixed slurry, and the slurry becomes a viscous gel, stirred After 2 hours it became a mobile liquid. Then triethylamine was added to the gel, stirred for 3 hours, and then the gel was put into an autoclave at 205° C. for 20 hours. The reacted solid was washed with water six times, dried at 105°C for 6 hours, sintered at 560°C for 12 hours, ground and passed through a 325-mesh sieve to obtain an aluminu...
Embodiment 1
[0054] Add 62kg1196 resin in the reaction kettle, then add 0.5kg Disperbyk-166 dispersant, 0.5kg JF-27 anti-settling agent, 15kg methyl isobutyl ketone, 6kg coated aluminum phosphate molecular sieve, 15kg titanium dioxide and 1kg of talcum powder, stirred for 40 minutes, and then ground the resin mixture to obtain component 1 of polyurethane rust coating; in another reaction kettle, 50kg of CORONATE HXR curing agent was dissolved in 50kg of butyl acetate to make polyurethane tape Component 2 of the rust coating; add component 2 to component 1 according to the mass ratio of component 1: component 2 = 100:22, and cure at room temperature for 7 days to form a polyurethane rust coating.
Embodiment 2
[0056] Add 62kg1196 resin to the reaction kettle, then add 0.5kg Disperbyk-166 dispersant, 0.5kg JF-27 anti-settling agent, 19kg methyl isobutyl ketone, 2kg coated aluminum phosphate molecular sieve, 15kg titanium dioxide and 1kg of talcum powder, stirred for 40 minutes, and then ground the resin mixture to obtain component 1 of polyurethane rust coating; in another reaction kettle, 50kg of CORONATE HXR curing agent was dissolved in 50kg of butyl acetate to make polyurethane tape Component 2 of the rust coating; add component 2 to component 1 according to the mass ratio of component 1: component 2 = 100:22, and cure at room temperature for 7 days to form a polyurethane rust coating.
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