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Aqueous polyurethane resin dispersion, manufacturing method thereof, and paint composition containing the same

一种水性聚氨酯、聚氨酯树脂的技术，应用在聚脲/聚氨酯涂料、涂层等方向，能够解决水系介质分散性变差、涂膜硬度的影响不清楚、涂布剂领域不充分等问题，达到耐磨性优异、硬度优异、分散稳定性优异的效果

Inactive Publication Date: 2011-05-04
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when a polycarbonate polyol composed of an aliphatic polyol is used as the polycarbonate polyol, there is a problem that the hardness of the coating film obtained from the aqueous polyurethane resin dispersion is limited, for example, on the outer panels of aircrafts, automobiles, and houses. Insufficient problems in the field of coatings and coating agents for exterior walls and floor materials
[0004] Therefore, in order to improve the hardness of the coating film, it is generally proposed to use a water-based polyurethane resin dispersion with an alicyclic structure polyhydric alcohol, but if a polyhydric alcohol with an alicyclic structure is used as a raw material, the dispersion in the aqueous medium Poor performance, there will be problems in the handling and stability of water-based polyurethane resin dispersions
[0005] In fact, an example of an aqueous polyurethane resin dispersion using a polyhydric alcohol having an alicyclic structure is also disclosed (see Patent Document 2), but the effect on the hardness of the coating film obtained by applying the aqueous polyurethane resin dispersion is Not clear, and the dispersibility in aqueous media cannot meet the requirements

Method used

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  • Aqueous polyurethane resin dispersion, manufacturing method thereof, and paint composition containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0139] (Manufacture of polycarbonate polyol (a) having an alicyclic structure in the main chain)

[0140] 271.6 parts by weight of 1,6-hexanediol, 893.2 parts by weight of 1,4-cyclohexanedimethanol, 847.0 parts by weight of dimethyl carbonate and 0.15 parts by weight of tetra-n-butoxytitanium are charged into a device equipped with a stirrer, a thermometer and In the reactor of the fractionation tube, the by-produced methanol and dimethyl carbonate were reacted under the condition of 95-160°C while azeotroping. After almost no methanol was distilled off, the pressure was reduced to 10 mmHg or less, and the reaction was further made for 4 hours. It should be noted that the reaction was carried out under a nitrogen atmosphere. After completion of the reaction, the reaction liquid was cooled to obtain a colorless and transparent liquid at room temperature with a hydroxyl value of 124.7 (number average molecular weight: 900).

[0141] (Manufacture of water-based polyurethane res...

Embodiment 2

[0144] (Manufacture of water-based polyurethane resin dispersion)

[0145]180.8 parts by weight of the polycarbonate polyol (a) having an alicyclic structure in the main chain produced in Example 1, 36.4 parts by weight of 2,2-dimethylol propionic acid, and 6.4 parts by weight of 1,4-butanediol part and 195.0 parts by weight of NMP (N-methyl-2-pyrrolidone) were introduced into a reaction device equipped with a stirrer and a heater while introducing nitrogen gas. Then, it was heated to 60° C., and it was confirmed that the dimethylolpropionic acid was dissolved. Then add 244.0 parts by weight of hydrogenated MDI, 0.4 parts by weight of dibutyltin dilaurate as a catalyst, heat to 90°C, and carry out urethanization reaction in 5 hours to manufacture polyurethane prepolymer (carboxylic acid in polyurethane prepolymer The radical content was 2.61% by weight, and the total number of hydroxyl equivalents of the polyol components was 206). The NCO group content at the end of the ure...

Embodiment 3

[0147] (Manufacture of water-based polyurethane resin dispersion)

[0148] 180.0 parts by weight of polycarbonate polyol (a), 48.1 parts by weight of 2,2-dimethylolpropionic acid, and 8.9 parts by weight of 1,4-butanediol, produced in Example 1 part and 223.8 parts by weight of NMP (N-methyl-2-pyrrolidone) were introduced into a reaction device equipped with a stirrer and a heater while introducing nitrogen gas. Then, it was heated to 60° C., and it was confirmed that the dimethylolpropionic acid was dissolved. Then add 296.3 parts by weight of hydrogenated MDI, 0.4 parts by weight of dibutyltin dilaurate as a catalyst, heat to 90°C, and carry out urethanization reaction in 5 hours to manufacture polyurethane prepolymer (carboxylic acid in polyurethane prepolymer The radical content is 3.03% by weight, and the total number of hydroxyl equivalents of the polyol components is 180). The NCO group content at the end of the urethanization reaction was 5.20% by weight. The reacti...

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Abstract

An aqueous polyurethane resin dispersion produced by dispersing, in an aqueous medium, a polyurethane resin that is obtained by causing a chain extender (B) to react with a polyurethane prepolymer (A) obtained by causing a polycarbonate polyol (a) having an alicyclic structure in the main chain thereof, to react with an acidic group-containing polyol compound (b), and, if necessary, a polyol (c) other than (a) and (b), and a polyisocyanate (d), wherein the content of carboxylic acid group in the polyurethane prepolymer (A) is 2.0 to 13.0 weight %, and the total hydroxyl group equivalent of the polycarbonate polyole (a) having the alicyclic structure in the main chain thereof, the acidic group-containing polyol compound (b), and, if necessary, the polyol (c) other than (a) and (b), is 70 to 270.

Description

technical field [0001] The present invention relates to an aqueous polyurethane resin dispersion in which a polyurethane resin is dispersed in an aqueous medium, a method for producing the dispersion, and a coating composition containing the dispersion. Background technique [0002] Polycarbonate polyols are useful compounds as raw materials for the manufacture of polyurethane resins used in rigid foams, flexible foams, coatings, adhesives, synthetic leather, ink adhesives, etc., by reacting with isocyanate compounds. binder, etc. [0003] In addition, it is known that a coating film obtained by coating an aqueous polyurethane resin dispersion made of polycarbonate polyol as a raw material is excellent in light resistance, heat resistance, hydrolysis resistance, and oil resistance (see Patent Document 1). However, when a polycarbonate polyol composed of an aliphatic polyol is used as the polycarbonate polyol, there is a problem that the hardness of the coating film obtained...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/44C08G18/10C09D175/04
CPCC08G18/0823C08G18/12C08G18/44C08G18/6659C08G18/758C09D175/06C08G18/3228
Inventor 中村卓内贵昌弘森上敦史足立文夫高桥学
Owner UBE IND LTD
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