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.

CN102391769AInactive Publication Date: 2012-03-28SHANGHAI CHANGRUNFA PAINT
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-03-28
Estimated Expiration
Not applicable · inactive patent
Patent Text Reader

Abstract

The invention provides novel poly urethane (PU) yellowing-resistant quick-drying open varnish, which is characterized by comprising main paint and curing agent, wherein the main paint comprises hydroxy acrylic resin and chloroacetic resin with the self-drying performance of a repeating unit in a formula (I); in the formula (I), R1 is a hydrogen atom, an alkyl or a carboxyl, R2 is a hydrogen atom, an alkyl, a carboxyl or a hydroxyl, and n is more than 30; and the curing agent is polyisocyanate. According to the novel PN open varnish, dependence on nitrocotton by the traditional open paint can be gotten rid of, and the yellowing-resistance problem can be favorably solved. In addition, the drying speed of the novel yellowing-resistant quick-drying open varnish disclosed by the invention is high, hardness is further improved, and the novel yellowing-resistant quick-drying open varnish has a favorable open effect. Under the condition of keeping excellent paint film performance and improving the quality of wood products after the wood products are lacquered, PU paint drying time in the furniture coating process is drastically saved, and production efficiency is improved.
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Description

technical field

[0001] The invention relates to a wood product paint, in particular to a novel PU open varnish with fast drying, yellowing resistance and good open effect. Background technique

[0002] At present, nitro-based coatings (abbreviated as NC paints), ultraviolet-cured coatings (abbreviated as UV paints) and polyurethane coatings (abbreviated as PU paints) are the most common wood paints on the market. Among them, various types of paints have their own characteristics, but in comparison, PU paint has strong adhesion, good sealing, high flexibility, good film transparency, high chemical corrosion resistance and strong environmental protection. Advantages are the most widely used, with incomplete market statistics, at present, about 60% of PU paints are used in ordinary home decoration.

[0003] PU paint is a general term for all polyurethane coatings, which is a natural film-forming method without special processes. Its main cost includes the main paint containin...

Examples

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%.