Novel poly urethane (PU) yellowing-resistant quick-drying open varnish
A technology of clear finish and yellowing resistance, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problem of fast drying, yellowing resistance, openness and other characteristics that are difficult to ensure at the same time, and the yellowing resistance of light-colored substrates It can not meet the requirements, limit the application of open PU paint, etc., to solve the problem of yellowing resistance, save drying time, and achieve the effect of good opening effect.
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Embodiment 1
[0051] 1) Main paint: 100g, including:
[0052] Hydroxy acrylic resin, content 15g:
[0053] Vinyl resin, content 15g;
[0054] Main paint solvent: butyl ester, content 40g;
[0055] Plasticizer: dioctyl phthalate (DOP), content 1g;
[0056] Anti-sedimentation agent: 50-55% urea and N-methylpyrrolidone solution, content 0.5g.
[0057] Thickener: hydroxyethyl cellulose, content 2g;
[0058] Leveling agent: BYK333, content 1g,
[0059] Defoamer: BYK019, content 1g.
[0060] 2) Curing agent, 100g; including:
[0061] Curing agent solvent: butyl ester, content 60g;
[0062] HDI content 20g;
[0063] TDI trimer content 20g.
[0064] Wherein, the repeating monomer of the hydroxyacrylic resin is specifically shown in structural formula (I).
Embodiment 2
[0066] 1) Main paint, 100g, including:
[0067] Hydroxy acrylic resin: content 20g:
[0068] Vinyl resin: content 10g;
[0069] Main paint solvent: ethyl ester, content 45g;
[0070] Plasticizer: dioctyl phthalate (DOP), content 2g;
[0071] Anti-sedimentation agent: 50-55% urea and N-methylpyrrolidone solution, content 2g.
[0072] Thickener: propylene glycol alginate, content 1g;
[0073] Leveling agent: BYK333, content 0.5g,
[0074] Defoamer: BYK019, content 0.5g.
[0075] 2) Curing agent, 70g, including:
[0076] Curing agent solvent: ethyl ester, content 40g;
[0077] HDI, content 17g;
[0078] TDI trimer, content 13g.
[0079] Wherein, the hydroxyacrylic resin molecules have repeating units as described in structural formula (1) and structural formula (II), wherein the content of repeating units in structural formula (I) is ≥ 90%. Among them, R 1 and R 1 is hydrogen, R 2 .
Embodiment 3
[0081] 1) Main paint, 100g, including:
[0082] Hydroxy acrylic resin, content 20g:
[0083] Vinyl resin: content 15g;
[0084] Main paint solvent: toluene, content 50g;
[0085] Plasticizer: dioctyl phthalate (DOP) or dibutyl phthalate (DBP), content 3g;
[0086] Anti-sedimentation agent: 50-55% urea and N-methylpyrrolidone solution, content 3g.
[0087] Thickener: hydroxyethyl cellulose, content 2g;
[0088] Leveling agent: BYK333, content 1g,
[0089] Defoamer: BYK019, content 1g.
[0090] 2) Curing agent, 85g, including:
[0091] Curing agent solvent: toluene, content 51g;
[0092] HDI, content 17g;
[0093] TDI trimer, content 12g.
[0094] Wherein, the hydroxyacrylic resin molecules have repeating units as described in structural formula (1) and structural formula (II), wherein the content of repeating units in structural formula (I) is ≥ 90%.
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