Water dispersed isocyanate curing agent with delustring effect, and preparation method thereof

Abstract

The invention belongs to the technical field of curing agent, and discloses a water dispersed isocyanate curing agent with delustring effect, and a preparation method thereof. The water dispersed isocyanate curing agent with delustring effect is prepared through reaction of, by weight, 70 to 99 parts of an aliphatic polyisocyanate, 0.5 to 20 parts of a polyelhylene glycol monoalkyl ether, 0.5 to 10 parts of a polypropylene glycol or propylene glycol caprolactone modified product. The water dispersed isocyanate curing agent is convenient to prepare; the preparation method is simple; the water dispersed isocyanate curing agent with delustring effect can be dispersed in water easily; after mixing curing of the water dispersed isocyanate curing agent with an aqueous hydroxyl emulsion, paint film with ultra low luster is obtained, and at the same time excellent paint film hardness, water resistance, and alcohol resistance are maintained; the water dispersed isocyanate curing agent possessesexcellent delustring effect, water resistance, and chemical preparation resistance.

Description

technical field

[0001] The invention belongs to the technical field of curing agents, in particular to a water-dispersed isocyanate curing agent with matting effect and a preparation method. Background technique

[0002] At present, water-based two-component polyurethane has been widely used in the fields covered by solvent-based two-component polyurethane, and has been successfully applied in water-based industrial paint, wood paint, floor paint and other industries. Water-based two-component polyurethane has good physical and mechanical properties, and is comparable to solvent-based two-component polyurethane in terms of gloss, hardness, and chemical resistance. Moreover, due to the low solvent content of the water-based system, it has a very large environmental protection effect compared with the solvent system. Advantage.

[0003] The synthesis method of water-dispersed isocyanate curing agent used in water-based two-component polyurethane is mostly grafting reaction wi...

Examples

Embodiment 1

[0023] Mix 110.0 parts by mass of polyethylene glycol monomethyl ether (500 molecular weight, Haian Petrochemical, Jiangsu Province) and 50 parts by mass of polypropylene glycol N210 (1000 molecular weight, Dow Chemical), heat to 100-110°C and vacuumize for 2 hours; cool to 60 ℃, add 840.0 parts by mass of Desmodur N 3300 (Covestro solvent-free HDI trimer, NCO content 21.8±0.3%, NCO average functionality 3.5), raise the temperature to 100 ℃, and continue the reaction at this temperature for 4h. After cooling to room temperature, the obtained 100% solid-containing hydrophilic modified polyisocyanate was a near colorless transparent viscous liquid with a measured NCO value of 17.0% and a viscosity (25° C.) of 3800 cps.

Embodiment 2

[0025] Synthesis of modified polypropylene glycol caprolactone: 100.0 parts by mass of polypropylene glycol N210 (1000 molecular weight, Dow Chemical) and 80.0 parts by mass of ε-caprolactone, 0.2 parts by mass of stannous octoate are put into the reaction kettle, and nitrogen protection is carried out. , heated to 130°C, reacted for 24 hours, and cooled to room temperature to obtain a waxy white solid modified polypropylene glycol caprolactone with a theoretical molecular weight of 1800.

[0026] Heat 125.0 parts by mass of polyethylene glycol monomethyl ether (750 molecular weight, Haian Petrochemical, Jiangsu Province) and 40.0 parts by mass of the modified polypropylene glycol caprolactone (1800 molecular weight) synthesized above to 100-110° C. for 2 hours. Cool down to 60 ° C, add Desmodur N 3900 (Covestro solvent-free HDI trimer, NCO content is 23.5 ± 0.3%, NCO average functionality is 3.2) 840.0 parts by mass, after the addition, the temperature is raised to 100 ° C, an...

Embodiment 3

[0028] Mix 110.0 parts by mass of polyethylene glycol monomethyl ether (500 molecular weight, Jiangsu Haian Petrochemical) and 10 parts by mass of polypropylene glycol N210 (1000 molecular weight, Dow Chemical), heat to 100-110°C and vacuumize for 2 hours; cool to 60 ℃, add DesmodurZ 4470MPA / X (Covestro IPDI trimer, 70% solid content, NCO content is 11.9 ± 0.3%, NCO average functionality is 3.5) 840.0 mass parts, propylene glycol methyl ether acetate 50.0 mass parts, heating to 110°C, and the reaction was continued at this temperature for 4h. After cooling to room temperature, the obtained 70% solid-containing hydrophilic modified polyisocyanate is a nearly colorless transparent viscous liquid with a measured NCO value of 9.40% and a viscosity (25° C.) of 700 cps.

technical field

[0001] The invention belongs to the technical field of curing agents, in particular to a water-dispersed isocyanate curing agent with matting effect and a preparation method. Background technique

[0002] At present, water-based two-component polyurethane has been widely used in the fields covered by solvent-based two-component polyurethane, and has been successfully applied in water-based industrial paint, wood paint, floor paint and other industries. Water-based two-component polyurethane has good physical and mechanical properties, and is comparable to solvent-based two-component polyurethane in terms of gloss, hardness, and chemical resistance. Moreover, due to the low solvent content of the water-based system, it has a very large environmental protection effect compared with the solvent system. Advantage.

[0003] The synthesis method of water-dispersed isocyanate curing agent used in water-based two-component polyurethane is mostly grafting reaction wi...

Examples

Embodiment 1

[0023] Mix 110.0 parts by mass of polyethylene glycol monomethyl ether (500 molecular weight, Haian Petrochemical, Jiangsu Province) and 50 parts by mass of polypropylene glycol N210 (1000 molecular weight, Dow Chemical), heat to 100-110°C and vacuumize for 2 hours; cool to 60 ℃, add 840.0 parts by mass of Desmodur N 3300 (Covestro solvent-free HDI trimer, NCO content 21.8±0.3%, NCO average functionality 3.5), raise the temperature to 100 ℃, and continue the reaction at this temperature for 4h. After cooling to room temperature, the obtained 100% solid-containing hydrophilic modified polyisocyanate was a near colorless transparent viscous liquid with a measured NCO value of 17.0% and a viscosity (25° C.) of 3800 cps.

Embodiment 2

[0025] Synthesis of modified polypropylene glycol caprolactone: 100.0 parts by mass of polypropylene glycol N210 (1000 molecular weight, Dow Chemical) and 80.0 parts by mass of ε-caprolactone, 0.2 parts by mass of stannous octoate are put into the reaction kettle, and nitrogen protection is carried out. , heated to 130°C, reacted for 24 hours, and cooled to room temperature to obtain a waxy white solid modified polypropylene glycol caprolactone with a theoretical molecular weight of 1800.

[0026] Heat 125.0 parts by mass of polyethylene glycol monomethyl ether (750 molecular weight, Haian Petrochemical, Jiangsu Province) and 40.0 parts by mass of the modified polypropylene glycol caprolactone (1800 molecular weight) synthesized above to 100-110° C. for 2 hours. Cool down to 60 ° C, add Desmodur N 3900 (Covestro solvent-free HDI trimer, NCO content is 23.5 ± 0.3%, NCO average functionality is 3.2) 840.0 parts by mass, after the addition, the temperature is raised to 100 ° C, an...

Embodiment 3

[0028] Mix 110.0 parts by mass of polyethylene glycol monomethyl ether (500 molecular weight, Jiangsu Haian Petrochemical) and 10 parts by mass of polypropylene glycol N210 (1000 molecular weight, Dow Chemical), heat to 100-110°C and vacuumize for 2 hours; cool to 60 ℃, add DesmodurZ 4470MPA / X (Covestro IPDI trimer, 70% solid content, NCO content is 11.9 ± 0.3%, NCO average functionality is 3.5) 840.0 mass parts, propylene glycol methyl ether acetate 50.0 mass parts, heating to 110°C, and the reaction was continued at this temperature for 4h. After cooling to room temperature, the obtained 70% solid-containing hydrophilic modified polyisocyanate is a nearly colorless transparent viscous liquid with a measured NCO value of 9.40% and a viscosity (25° C.) of 700 cps.

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