Water-based polyurethane emulsion, its mfg. method and use

A water-based polyurethane and emulsion technology, applied in polyurea/polyurethane coatings, applications, latex paints, etc., can solve the problems of inability to disperse in water, high viscosity of isocyanate-terminated prepolymers, and achieve good resolvability

Inactive Publication Date: 2006-01-11
NIPPON POLYURETHANE IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the production method of Patent Document 2, since the viscosity of the isocyanate-terminated prepolymer is very high, if a uniform mixer, a homogenizer, and a microfluidized bed with strong shear force are not used, there are often problems that cannot be carried out. water dispersion, necessitating modifications to manufacturing equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Synthetic example 1

[0067] Add 863g HDI, 137g MPEG-1, 0.2g zirconium 2-ethylhexanoate into a 1L reactor with a stirrer, thermometer, cooler and nitrogen conduit, and react at 90°C for 2 hours. Next, 0.1 g of phosphoric acid was added, and the termination reaction was performed at a temperature of 50° C. for 1 hour. The isocyanate content of the reaction product after the termination of the reaction was 40.2%. Thin film distillation was performed on the reaction product under the condition of 130° C.×0.04 kPa to obtain allophanate-modified polyisocyanate isocyanate ALP-1.

[0068] The isocyanate content of ALP-1 is 11.4%, the viscosity at 25° C. is 140 mPa·s, and the free diisocyanate content is 0.1%. And, using FT-IR and 13 The ALP-1 was analyzed by C-NMR, and the absence of urethane groups and isocyanurate groups was basically confirmed, and the presence of allophanate groups was confirmed.

Synthetic example 2

[0070] Add 782.6g HDI, 217.4g MPEG-2, 0.2g zirconium 2-ethylhexanoate into a 1L reactor equipped with a stirrer, thermometer, cooler and nitrogen conduit, and react at 90°C for 2 hours . Next, 0.1 g of phosphoric acid was added, and the termination reaction was performed at a temperature of 50° C. for 1 hour. The isocyanate content of the reaction product after the termination of the reaction was 36.5%. Thin film distillation was performed on the reaction product under the condition of 130° C.×0.04 kPa to obtain allophanate-modified polyisocyanate isocyanate ALP-2.

[0071] The isocyanate content of ALP-2 is 7.2%, the viscosity at 25° C. is 100 mPa·s, and the free diisocyanate content is 0.1%. And, using FT-IR and 13 ALP-2 was analyzed by C-NMR, and it was confirmed that there were substantially no urethane groups and isocyanurate groups, and the presence of allophanate groups was confirmed.

Synthetic example 3

[0073] Add 200g NMP, 265.6g 2,4-TDI, 534.5g MPEG-2 in a 1L reactor with a stirrer, a thermometer, a cooler and a nitrogen conduit, and carry out aminomethylation at 80°C for 4 hours acidification reaction. The isocyanate content at this time was 9.6%. Next, 0.5 g of PTSM and 0.025 g of zinc acetylacetonate were added and reacted at a temperature of 100° C. for 5 hours to obtain allophanate-modified polyisocyanate ALP-3.

[0074] ALP-3 has a solid content of 80%, an isocyanate content of 6.4%, a viscosity at 25° C. of 50 mPa·s, and a free diisocyanate content of 0.1%. And, using FT-IR and 13 C-NMR analysis of ALP-3 confirmed the absence of urethane groups and the presence of allophanate groups and isocyanurate groups.

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Abstract

The present invention provides an aqueous polyurethane emulsion, capable of obtaining a film excellent in re-dissolving property, close adhesion, coated film physical properties, and its method. This aqueous polyurethane emulsion is obtained by emulsifying in water a polyurethane resin obtained by reacting (A) an organic polyisocyanate, (B) an active hydrogen-containing compound, (C) a compound containing an anionic polar group and the active hydrogen group and (D) a neutralizing agent. The rganic polyisocyanate contains (A1) an allophanate-modified polyisocyanate obtained from (A1-1) an alkoxypoly(oxyalkylene) glycol containing >=50 mol % oxyethylene group in its recurring units and (A1-2) hexamethylene diisocyanate.

Description

technical field [0001] The invention relates to a water-based polyurethane emulsion which can be produced by existing equipment and has good film physical properties, and relates to a production method and application of the emulsion. Background technique [0002] Because water-based polyurethane emulsion has excellent adhesion to substrates, abrasion resistance, impact resistance, solvent resistance, etc., it is widely used as coatings and inks in paper, plastics, films, metals, fiber products, etc. , adhesives, various coating agents, and their manufacturing methods have also been studied. And, after producing polyurethane resin solution in single or mixed solvent such as acetone, methyl ethyl ketone, N-methylpyrrolidone (hereinafter abbreviated as NMP), aromatic organic solvent, etc., the process of water dispersion and desolvation treatment has been developed Water-based polyurethane resins such as emulsions, colloidal suspensions, and aqueous solutions. [0003] If al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/72C08G18/08C09D175/04C09D11/10C08G18/10C08G18/65C09D5/02C09D11/02C09D11/023
Inventor 东久保一郎森岛刚山本和俊池本满成
Owner NIPPON POLYURETHANE IND CO LTD
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