Waterborne polyurethane resin as well as preparation method and application thereof

A water-based polyurethane and resin technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor stone chip resistance, achieve excellent stone chip resistance, reduce VOC, and reduce environmental impact

Active Publication Date: 2020-11-10

中山大桥化工集团有限公司

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AI-Extracted Technical Summary

Problems solved by technology

Water-based polyurethane resin is mainly used in water-based automotive paint and water-based base paint for automobiles...

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Abstract

The invention discloses waterborne polyurethane resin and a preparation method and application thereof. The waterborne polyurethane resin is obtained through a reaction of a polyol prepolymer, a hydrophilic monomer, an isocyanate monomer, a functional monomer, a chain extender and organic alkali, and the hydrophilic monomer is at least one of a dihydroxy compound, polyethylene glycol and quaternary ammonium salt; wherein the functional monomer is at least one of trimethylolpropane, pentaerythritol, monoglyceride and unsaturated fatty acid. The automobile water-based floating coat prepared fromthe water-based polyurethane resin has excellent stone beating resistance and paint film hardness, and meanwhile, the prepared automobile water-based colored paint has excellent adhesive force and flexibility, is high in comprehensive performance and can meet the requirements of a higher coating process in the field of automobiles.

Application Domain

Polyurea/polyurethane coatings

Technology Topic

PrepolymerFunctional monomer +13

Image

Examples

Experimental program(6)
Comparison scheme(2)
Effect test(1)

Example Embodiment

[0032] Example 1:

[0033] A water-based polyurethane resin, comprising the following raw materials in parts by weight:

[0034] Polycarbonate diol: 20 parts;

[0035] Dimethylolbutyric acid: 5 parts;

[0036] Isophorone diisocyanate: 20 parts;

[0037] Pentaerythritol: 4 parts;

[0038] 1. 2-Propanediol: 5 parts;

[0039] Tin dilaurate: 1 part;

[0040] Triethylamine: 4 parts.

[0041] Its preparation method comprises the following steps:

[0042] (1) under nitrogen protection, add 20 parts of polycarbonate diol, 5 parts of dimethylol butyric acid, 20 parts of isophorone diisocyanate, 1 part of tin dilaurate into the reactor, and be warming up to 80 ℃, the reaction is 2h;

[0043] (2) add 4 parts of pentaerythritol, further react for 2h, then add 5 parts of 1.2-propanediol, stir and react for 1h, cool down, add 4 parts of triethylamine to carry out neutralization reaction;

[0044] (3) Add 112 parts of deionized water under high shear conditions, and stir for 2 hours to obtain water-based polyurethane resin. The acid value of the water-based polyurethane resin is 12.5 mg KOH/g, the viscosity is 3300 mPa·s, and the number-average molecular weight of the resin is 6000, the solid content is 35.6%.

Example Embodiment

[0045] Example 2:

[0046] A water-based polyurethane resin, comprising the following raw materials in parts by weight:

[0047] Polyester diol: 25 parts;

[0048] Sodium 1,4-dihydroxy-2-butanesulfonate: 3 parts;

[0049] Diphenylmethane diisocyanate: 15 parts;

[0050] Hexamethylene diisocyanate: 5 parts;

[0051] Trimethylolpropane: 3 parts;

[0052] Palm oil: 6 parts;

[0053] 1,4-Butanediol: 6 parts;

[0054] Bismuth laurate: 1.5 parts;

[0055] N,N`-dimethylethanolamine: 6 parts.

[0056] Its preparation method comprises the following steps:

[0057] (1) Under nitrogen protection, mix 25 parts of polyester diol, 3 parts of sodium 1,4-dihydroxy-2-butane sulfonate, 15 parts of diphenylmethane diisocyanate, 5 parts of hexamethylene diisocyanate , 1.5 parts of bismuth laurate was added to the reactor, the temperature was raised to 90°C, and the reaction was carried out for 3h;

[0058] (2) Add 3 parts of trimethylolpropane and 6 parts of palm oil, further react for 3h, then add 6 parts of 1,4-butanediol, stir and react for 2h, cool down, add 6 parts of N,N`-dimethyl Ethanolamine is neutralized;

[0059](3) Add 145 parts of deionized water under high shear conditions, and stir for 1 hour to obtain water-based polyurethane resin. The acid value of the water-based polyurethane resin is 15.8 mg KOH/g, the viscosity is 4800 mPa·s, and the number-average molecular weight of the resin is 7000, the solids content is 35.9%.

Example Embodiment

[0060] Example 3:

[0061] A water-based polyurethane resin, comprising the following raw materials in parts by weight:

[0062] Polyether glycol: 30 parts;

[0063] Sodium 1,4-dihydroxy-2-butanesulfonate: 2 parts;

[0064] Cyclohexane dimethylene diisocyanate: 25 parts;

[0065] Trimethylolpropane: 2 parts;

[0066] Palm oil: 5 parts;

[0067] Hexanediamine: 3 parts;

[0068] Stannous chloride: 1.2 parts;

[0069] N,N`-diisopropylethylamine: 6 parts.

[0070] Its preparation method comprises the following steps:

[0071] (1) Under nitrogen protection, 30 parts of polyether glycol, 2 parts of sodium 1,4-dihydroxy-2-butane sulfonate, 25 parts of cyclohexane dimethylene diisocyanate, 1.2 parts of chloride Tin was added to the reactor, the temperature was raised to 75°C, and the reaction was carried out for 4h;

[0072] (2) Add 2 parts of trimethylolpropane and 5 parts of palm oil, further react for 2h, then add 3 parts of hexamethylenediamine, stir and react for 2h, cool down, add 6 parts of N,N`-diisopropylethylamine to carry out Neutralization reaction;

[0073] (3) Add 135 parts of deionized water under high shear conditions, and stir for 3 hours to obtain water-based polyurethane resin. The acid value of the water-based polyurethane resin is 21.6 mg KOH/g, the viscosity is 5500 mPa·s, and the number-average molecular weight of the resin is 9200 with a solids content of 35.3%.

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PUM

Property	Measurement	Unit
Acid value	12.5	mgKOH/g
Viscosity	3300.0	mPa·s
Acid value	15.8	mgKOH/g
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Low environmental impact
Low VOC

Waterborne polyurethane resin as well as preparation method and application thereof

A water-based polyurethane and resin technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor stone chip resistance, achieve excellent stone chip resistance, reduce VOC, and reduce environmental impact

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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