Waterborne polyurethane resin dispersion and use thereof

A water-based polyurethane and polyurethane resin technology, applied in polyurea/polyurethane coatings, coatings, latex paints, etc., can solve the problems of insufficient solvent resistance and water resistance of the coating film, which cannot be said to be sufficient, and achieve high water resistance , Excellent impact resistance and high fracture energy

Inactive Publication Date: 2013-10-09
UBE IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aqueous polyurethane resin dispersions using polycarbonate polyols exhibit good properties as described above, but they cannot be said to be sufficient compared to solvent-based polyurethanes.
In particular, the solvent resistance and water resistance of the coating film are not sufficient

Method used

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  • Waterborne polyurethane resin dispersion and use thereof
  • Waterborne polyurethane resin dispersion and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0136] [Manufacture of water-based polyurethane resin dispersion (1)]

[0137] Add ETERNACOLL UH-200 (registered trademark; polycarbonate diol produced by Ube Industries; number average molecular weight 1986; hydroxyl value 56.4mgKOH / g; make 310 g of polycarbonate diol obtained by reacting 1,6-hexanediol and dimethyl carbonate), 18.3 g of 2,2-dimethylolpropionic acid (DMPA), and 154 g of N-methylpyrrolidone (NMP). Thereafter, it was heated and stirred at 60° C., and it was confirmed that DMPA was dissolved. 133 g of 4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI) and 0.38 g of dibutyltin dilaurate (catalyst) were added, heated to 90° C., and urethanization reaction was performed over 5 hours. Thereafter, 11.2 g of 3,5-dimethylpyrazole (DMPZ) was injected, and stirring was continued at the same temperature for 1.5 hours to obtain a polyurethane prepolymer. The free isocyanate group content ratio at the end of the urethanization reaction was 1.79% by weight. The reac...

Embodiment 2

[0141] [Manufacture of water-based polyurethane resin dispersion (2)]

[0142] Add ETERNACOLL UH-200 (registered trademark; polycarbonate diol produced by Ube Industries; number average molecular weight 2025; hydroxyl value 55.4mgKOH / g; make 1,6-hexane 325 g of polycarbonate diol obtained by reacting diol and dimethyl carbonate), 16.3 g of 2,2-dimethylolpropionic acid (DMPA), and 155 g of N-methylpyrrolidone (NMP). Thereafter, it was heated and stirred at 60° C., and it was confirmed that DMPA was dissolved. 127 g of 4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI) and 0.38 g of dibutyltin dilaurate (catalyst) were added, heated to 90°C, and urethanization reaction was performed over 5 hours. Thereafter, 10.4 g of 3,5-dimethylpyrazole (DMPZ) was injected, and stirring was continued at the same temperature for 1.5 hours to obtain a polyurethane prepolymer. The free isocyanate group content ratio at the end of the urethanization reaction was 1.70% by weight. The reactio...

Embodiment 3

[0146] [Manufacture of water-based polyurethane resin dispersion (3)]

[0147] Add ETERNACOLL UH-200 (registered trademark; polycarbonate diol manufactured by Ube Industries; number average molecular weight 1968; hydroxyl value 57.0mgKOH / g; make 1,6-hexane 311 g of polycarbonate diol obtained by reacting diol and dimethyl carbonate), 18.6 g of 2,2-dimethylolpropionic acid (DMPA), and 157 g of N-methylpyrrolidone (NMP). Thereafter, it was heated and stirred at 60° C., and it was confirmed that DMPA was dissolved. 138 g of 4,4'-dicyclohexylmethane diisocyanate (hydrogenated MDI) and 0.38 g of dibutyltin dilaurate (catalyst) were added, heated to 90°C, and urethanization reaction was performed over 5 hours. Thereafter, 11.1 g of 3,5-dimethylpyrazole (DMPZ) was injected, and stirring was continued at the same temperature for 1.5 hours to obtain a polyurethane prepolymer. The free isocyanate group content ratio at the end of the urethanization reaction was 1.49% by weight. The r...

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Abstract

An aqueous polyurethane resin dispersion exhibits excellent drying properties of coating films and gives coating films having high water resistance and on the other hand showing a high rate of swelling with respect to aqueous cleaning liquids to permit new application. The aqueous polyurethane resin dispersion is a dispersion of a polyurethane resin in an aqueous medium, the polyurethane resin being obtained by reacting (A) a polyurethane prepolymer obtained from (a) a polyisocyanate compound, (b) a polycarbonate polyol with a number average molecular weight of 400 to 3000, (c) an acidic group-containing polyol compound and (d) a blocking agent, with (B) a chain extender, the total content of urethane bonds and urea bonds being 7 to 15 wt %, the content of carbonate bonds being 15 to 40 wt %, the content of ether bonds being 0 wt %, the content of isocyanate groups bonded to the blocking agent being 0.2 to 2 wt %, each of these contents being based on solid contents, the acid value being 11 to 16 mg KOH / g, the weight average molecular weight being 25,000 to 60,000. A coating composition includes the dispersion. A polyurethane resin film is obtained by thermally drying a composition including the dispersion.

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. Moreover, this invention relates to the coating composition containing the said aqueous polyurethane resin dispersion, and the polyurethane resin film obtained by heat-drying the composition containing the said polyurethane resin dispersion. Background technique [0002] Water-based polyurethane resin dispersion can form a coating film with adhesiveness, abrasion resistance, and rubber properties. Compared with conventional solvent-based polyurethanes, it is an environmentally friendly material that can reduce volatile organic compounds, so it is gradually replacing solvent-based polyurethanes. [0003] Polycarbonate polyol is a useful compound as a raw material for polyurethane resins, and can be used in rigid foams, flexible foams, paints, adhesives, synthetic leather, ink binders, etc. by reacting with isocyanate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/65C08G18/80C09D5/02C09D175/04
CPCC08G18/0823C08G18/6659C08G18/10C09D175/06C09D175/04C08G18/28C08G18/65C08G18/80C08J3/03C08L75/04C09D5/02
Inventor 森上敦史内贵昌弘足立文夫高桥学
Owner UBE IND LTD
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