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Anti-scratch aqueous polyurethane disperse system with high hygrometric state adhesive force and use thereof

A technology of wet adhesion and water-based polyurethane, applied in the field of coatings, can solve problems such as failure to use, low glass transition temperature of polyether chain segments, long curing time at room temperature, etc.

Active Publication Date: 2009-08-05
海聚高分子材料科技(广州)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Chinese patent application CN1554688A uses polyamine silane coupling agent and inorganic silicate compound modified waterborne polyurethane, which is characterized in that the mechanical strength and water resistance of waterborne polyurethane are improved by the chain extension and coupling effect of polyamine silane coupling agent, However, this technology is limited to polyether systems, more specifically polypropylene glycol ether systems. Due to the low glass transition temperature and strong hydrophilicity of the polyether structure, the prepared water-based polyurethane is particularly soft and has low adhesion in wet environments.
[0008] Chinese patent CN1854165A adopts polyamine silane coupling agent such as N-(2-aminoethyl)-3-aminopropyltrimethoxysilane and N-(2-aminoethyl)-3-aminopropyltriethoxy Silane-modified polyether-type waterborne polyurethane, polyamine silicone coupling agent improves water resistance, but the polyether segment itself is highly hydrophilic, even if it is modified with polyamine silicone coupling agent, the water resistance of waterborne polyurethane can be improved Limited; secondly, the glass transition temperature of the polyether segment used in this patent is low, the elongation at break of the prepared water-based polyurethane is greater than 500%, and the film-forming material is particularly soft, so it can only be used as an adhesive, not a coating
[0009] In short, the existing patents use monoamine or polyamine silicone coupling agent alone to modify water-based polyurethane, and there are the following problems: (1) the curing time at room temperature is very long, usually more than 7 days; (2) the performance of water-based polyurethane cannot be improved at the same time Scratch resistance, water resistance and wet adhesion; (3) The water-based polyurethane modified by the above-mentioned silane coupling agent is mainly used in the field of adhesives due to performance defects, and has not been used in the field of coatings with high performance requirements
At present, there are no relevant technical reports that the above-mentioned comprehensive performance has been significantly improved.

Method used

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  • Anti-scratch aqueous polyurethane disperse system with high hygrometric state adhesive force and use thereof
  • Anti-scratch aqueous polyurethane disperse system with high hygrometric state adhesive force and use thereof
  • Anti-scratch aqueous polyurethane disperse system with high hygrometric state adhesive force and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Embodiment 1 Aqueous polyurethane dispersion 1

[0108] Mix 100.0g polyester polyol II (molecular weight 1000), 8.0g dimethylol propionic acid and 18.0g N-methylpyrrolidone and heat to 70°C, stir until the dimethylol propionic acid is completely dissolved; add 21.0g toluene di Isocyanate, react at 70°C for 30 minutes, then add 30.2g of hexamethylene diisocyanate, heat up to 100°C for reaction until the -NCO content reaches 6.4%, cool down to 60°C, add 6.0g of triethylamine to neutralize the prepolymer; add 156.0g of water, stir vigorously to disperse the polyurethane prepolymer, at the same time slowly add 7.9g of ethylenediamine and 1.74g of D-15 coupling agent mixture, and then stir for 30min until the FTIR spectrum no longer shows —NCO group group absorption peak. An aqueous polyurethane dispersion with a solid content of 50% was obtained.

Embodiment 2

[0109] Embodiment 2 Waterborne polyurethane dispersion 2

[0110] Mix 80.0g polyester polyol I (molecular weight 2000), 20.0g PTMEG (molecular weight 1000), 7.7g dimethylol propionic acid and 16.5g N-methylpyrrolidone, mix and heat to 80°C, stir until the dimethylol propionic acid is completely Dissolve; add 10.5g diphenylmethane diisocyanate, react at 70°C for 30 minutes, then add 37.3g isophorone diisocyanate, heat up to 100°C and react until the -NCO group content reaches 5.0%, cool down to 60°C, add 8.2g triisopropylamine to neutralize the prepolymer; then add 410.0g water, stir vigorously to disperse the polyurethane prepolymer, at the same time slowly add 2.3g ethylenediamine and 17.1g D-17 coupling agent mixture, after adding Stir for 30 min until the -NCO group absorption peak no longer appears in the FTIR spectrum. An aqueous polyurethane dispersion with a solid content of 30% was obtained.

Embodiment 3

[0111] Embodiment 3 aqueous polyurethane dispersion 3

[0112] Mix 100.0g of polyester polyol V (molecular weight 1000), 13.4g of dimethylol propionic acid and 36.4g of N-methylpyrrolidone and heat to 70°C, stir until the dimethylol propionic acid is completely dissolved; add 5.0g of hexadiene Isocyanate, 14.0g hexamethylene diisocyanate trimer and 65.0g isophorone diisocyanate, heat up to 100°C to react until the -NCO content reaches 5.8%, cool down to 60°C, add 10.1g triethylamine to neutralize the prepolymer Add 785g of water again, stir vigorously to disperse the polyurethane prepolymer, and stir until the FTIR spectrum no longer shows the —NCO group absorption peak. An aqueous polyurethane dispersion with a solid content of 20% was obtained.

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Abstract

The invention discloses an aqueous polyurethane dispersion with scuffing resistance and high wet adhesion and the application thereof. The aqueous polyurethane dispersion is produced from reactive coupling agent, polymer polylol, polyisocyanate, hydrophilic chain extender, neutralizing agent and polyamine. The reactive coupling agent is added in a raw material system, and after being coated on metal, glass, fibre glass, cement substrate material, magnesia, ceramics or stone, the prepared aqueous polyurethane dispersion can remarkably improve the scuffing resistant capability and the adhesive force to the substrate material of the coating, especially the adhesive force to the substrate material under the damp environment, thereby effectively makes up the deficiencies of the prior coating technology.

Description

technical field [0001] The invention belongs to the technical field of coatings, and relates to a water-based polyurethane dispersion with scratch resistance and high wet adhesion and an application thereof. Background technique [0002] Water-based polyurethane uses water as the dispersion medium, has the characteristics of environmental protection and non-toxicity, and has a wide range of applications in coatings, adhesives and sealants. However, the molecular structure of unmodified waterborne polyurethane contains strong polar carbamate groups and hydrophilic ionic groups, which has poor water resistance and solvent resistance, and will reduce the surface hardness of the coating and the adhesion to the substrate. In particular, in the specific application process, water-based polyurethane must be modified. [0003] The molecular structure of the coupling agent contains different functional groups, which can couple the polymer molecular chain with the substrate. For exam...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/72C08G18/65C09D175/04
Inventor 邓湘华曾景艳周治明
Owner 海聚高分子材料科技(广州)有限公司
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