Water-based transparent polyurethane, water-based UV curing gloss oil, water-based UV curing ink and preparation method thereof

Abstract

The invention provides water-based transparent polyurethane, water-based UV curing gloss oil, water-based UV curing ink and a preparation method thereof. The water-based transparent polyurethane is prepared from the following raw materials in parts by weight: 30-50 parts of isophorone or diisopropylketone, 5-20 parts of diisocyanate, 80-120 parts of polyester polyol, 1-3 parts of 2, 2-dimethylolpropionic acid, 10-30 parts of neopentyl glycol and 5-30 parts of C7-C22 alkanediol. Isophorone and diisopropylketone not only can be used as reaction monomers, but also can be used as solvents, have high dissolvability to diisocyanate, and are miscible with water, so that the generated prepolymer can form a uniform dispersion in water. 2, 2-dimethylolpropionic acid not only can be used as a chain extender, but also can enable polyurethane to obtain a self-emulsifying property, so that the self-emulsifying water-based polyurethane with excellent stability can be prepared in an internal emulsification manner. Under the action of isophorone, diisopropylketone, neopentyl glycol and alkanediol, a polyurethane aqueous dispersion which is uniformly dispersed can be generated, and the polyurethaneaqueous dispersion has high refractive index and aqueous solution stability.

Description

technical field

[0001] The invention relates to the field of polyurethane, in particular to a water-based transparent polyurethane, a water-based UV curable varnish, a water-based UV curable ink and a preparation method thereof. Background technique

[0002] With the trend of restricting the emission of VOC (volatile organic compounds) in coatings, the environmental protection legislation of various countries is becoming more and more perfect, and the implementation is becoming more and more strict, which promotes the development and development of environmentally friendly coating products. UV-curable coatings are an environmentally friendly and energy-saving coating developed in the 1960s. my country began to set foot in this technical field in the 1970s, and it developed rapidly after the 1990s. UV-curable coatings can be quickly cured under UV irradiation, which not only cures quickly, but also saves energy compared to heat-cured coatings. At present, it is not only wide...

Examples

preparation example Construction

[0024] The preparation method of water-based transparent polyurethane may comprise the steps:

[0025] (1) mixing isophorone or diisopropyl ketone and diisocyanate uniformly to obtain a mixed solution;

[0026] (2) Mix the polyester polyol and 2,2-dimethylol propionic acid evenly, and drop them into the mixed solution in step (1) under stirring conditions, and react at 75-85°C after the dropping is completed for 3 ~5h;

[0027] (3) add dropwise triethanolamine in the reactant of stirring step (2) and then add water to form an aqueous solution, and add dropwise neopentyl glycol and C 7 ~C 22 alkanediol, after reacting for 0.5-2h, remove part of the water under reduced pressure.

[0028] Wherein, triethanolamine accounts for 0.1-2% of the weight sum of diisocyanate and polyester polyol, and water accounts for 100-150% of the weight sum of diisocyanate and polyester polyol.

[0029]The water-based UV curable varnish of the present invention, in terms of percentage by weight, ...

Embodiment 1

[0038] The preparation method of waterborne transparent polyurethane is:

[0039] (1) Mix 40 parts of isophorone and 15 parts of diisocyanate evenly under stirring to obtain a mixed solution;

[0040] (2) 100 parts of polyester polyols with a number average molecular weight of 4000 (condensed from neopentyl glycol and m-terephthalic acid) and 3 parts of 2,2-dimethylol propionic acid were mixed uniformly, and Drop into the mixed solution in step (1) with stirring, and react at 80°C for 4 hours after the drop is completed;

[0041] (3) After adding 0.15 parts of triethanolamine dropwise to the reactant in stirring step (2), 120 parts of deionized water are added to form an aqueous solution, and 20 parts of neopentyl glycol and 20 parts of C 7 ~C 22 alkanediol, after reacting for 2h, part of the water was removed under reduced pressure.

Embodiment 2

[0043] The preparation method of waterborne transparent polyurethane is:

[0044] (1) Mix 40 parts of diisopropyl ketone and 15 parts of diisocyanate evenly under stirring to obtain a mixed solution;

[0045] (2) 100 parts of polyester polyols with a number average molecular weight of 4000 (condensed from neopentyl glycol and m-terephthalic acid) and 3 parts of 2,2-dimethylol propionic acid were mixed uniformly, and Drop into the mixed solution in step (1) with stirring, and react at 80°C for 4 hours after the drop is completed;

[0046] (3) After adding 0.15 parts of triethanolamine dropwise to the reactant in stirring step (2), 120 parts of deionized water are added to form an aqueous solution, and 20 parts of neopentyl glycol and 20 parts of C 7 ~C 22 alkanediol, after reacting for 2h, part of the water was removed under reduced pressure.

technical field

[0001] The invention relates to the field of polyurethane, in particular to a water-based transparent polyurethane, a water-based UV curable varnish, a water-based UV curable ink and a preparation method thereof. Background technique

[0002] With the trend of restricting the emission of VOC (volatile organic compounds) in coatings, the environmental protection legislation of various countries is becoming more and more perfect, and the implementation is becoming more and more strict, which promotes the development and development of environmentally friendly coating products. UV-curable coatings are an environmentally friendly and energy-saving coating developed in the 1960s. my country began to set foot in this technical field in the 1970s, and it developed rapidly after the 1990s. UV-curable coatings can be quickly cured under UV irradiation, which not only cures quickly, but also saves energy compared to heat-cured coatings. At present, it is not only wide...

Examples

preparation example Construction

[0024] The preparation method of water-based transparent polyurethane may comprise the steps:

[0025] (1) mixing isophorone or diisopropyl ketone and diisocyanate uniformly to obtain a mixed solution;

[0026] (2) Mix the polyester polyol and 2,2-dimethylol propionic acid evenly, and drop them into the mixed solution in step (1) under stirring conditions, and react at 75-85°C after the dropping is completed for 3 ~5h;

[0027] (3) add dropwise triethanolamine in the reactant of stirring step (2) and then add water to form an aqueous solution, and add dropwise neopentyl glycol and C 7 ~C 22 alkanediol, after reacting for 0.5-2h, remove part of the water under reduced pressure.

[0028] Wherein, triethanolamine accounts for 0.1-2% of the weight sum of diisocyanate and polyester polyol, and water accounts for 100-150% of the weight sum of diisocyanate and polyester polyol.

[0029]The water-based UV curable varnish of the present invention, in terms of percentage by weight, ...

Embodiment 1

[0038] The preparation method of waterborne transparent polyurethane is:

[0039] (1) Mix 40 parts of isophorone and 15 parts of diisocyanate evenly under stirring to obtain a mixed solution;

[0040] (2) 100 parts of polyester polyols with a number average molecular weight of 4000 (condensed from neopentyl glycol and m-terephthalic acid) and 3 parts of 2,2-dimethylol propionic acid were mixed uniformly, and Drop into the mixed solution in step (1) with stirring, and react at 80°C for 4 hours after the drop is completed;

[0041] (3) After adding 0.15 parts of triethanolamine dropwise to the reactant in stirring step (2), 120 parts of deionized water are added to form an aqueous solution, and 20 parts of neopentyl glycol and 20 parts of C 7 ~C 22 alkanediol, after reacting for 2h, part of the water was removed under reduced pressure.

Embodiment 2

[0043] The preparation method of waterborne transparent polyurethane is:

[0044] (1) Mix 40 parts of diisopropyl ketone and 15 parts of diisocyanate evenly under stirring to obtain a mixed solution;

[0045] (2) 100 parts of polyester polyols with a number average molecular weight of 4000 (condensed from neopentyl glycol and m-terephthalic acid) and 3 parts of 2,2-dimethylol propionic acid were mixed uniformly, and Drop into the mixed solution in step (1) with stirring, and react at 80°C for 4 hours after the drop is completed;

[0046] (3) After adding 0.15 parts of triethanolamine dropwise to the reactant in stirring step (2), 120 parts of deionized water are added to form an aqueous solution, and 20 parts of neopentyl glycol and 20 parts of C 7 ~C 22 alkanediol, after reacting for 2h, part of the water was removed under reduced pressure.