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Aqueous dual-component polyurethane paint system

A technology of two-component coatings and water-based dispersions, which can be used in fiber processing, textiles and papermaking, etc., and can solve the problems that have been disclosed

Inactive Publication Date: 2015-09-02
COVESTRO DEUTSCHLAND AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, coating systems suitable for this application have not been disclosed in the prior art

Method used

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  • Aqueous dual-component polyurethane paint system
  • Aqueous dual-component polyurethane paint system
  • Aqueous dual-component polyurethane paint system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0050] Raw Materials and Reagents

[0051]

[0052]

[0053]

[0054]

[0055] The coating test items involved in the present invention include anti-liquid paraffin items and drying performance test items. The substrates, pretreatments, and detection and sample preparation methods used are listed in Table 1.

[0056] Table 1 Selection and pretreatment of substrates

[0057]

[0058]

[0059] Coating test samples are prepared, preferably but not limited to, by wire bar coating, and cured in an oven at 60°C for 24 hours. According to actual needs, the wet film thickness is set at 6-120 μm.

Embodiment 1

[0071] Preparation of Component A

[0072] Put 47.00g in the blender container A2601, under medium-low speed (about 1000-1200rpm) stirring, slowly add 11.00g deionized water, 42.00g After A2546, increase the stirring speed to 2500rpm, and keep the stirring speed for 20 minutes to complete the preparation of component A.

[0073] Use a 400-mesh filter to filter the above finished products. The finished products should be properly stored in airtight containers and stored for at least 24 hours before use.

[0074] Preparation of Component B

[0075] Component B is 2487 / 1, use MPA to dilute with curing agent / MPA=3 / 1.

[0076] Use and sample preparation

[0077] Accurately weigh component A and component B according to the mass ratio of 100.00 / 25.00, mix by hand stirring, and stir for 5 minutes to ensure that component A and component B are fully mixed and even, ready to use.

[0078] On the substrate, the composition is coated with a wire bar and cured in an oven at 60°C ...

Embodiment 2

[0082] Preparation of Component A

[0083] Put 42.00g in the blender container A2601, under medium-low speed (about 1000-1200rpm) stirring, slowly add 11.00g deionized water, 47.00g A2542 then increase the stirring speed to 2500rpm, and keep the stirring speed for 20 minutes to complete the preparation of component A.

[0084] Use a 400-mesh filter to filter the above finished products. The finished products should be properly stored in airtight containers and stored for at least 24 hours before use.

[0085] Preparation of Component B

[0086] Component B is 2487 / 1, use MPA to dilute with curing agent / MPA=3 / 1.

[0087] Use and sample preparation

[0088] Accurately weigh component A and component B according to the mass ratio of 100.00 / 28.00, mix by hand stirring, and stir for 5 minutes to ensure that component A and component B are fully mixed evenly before use.

[0089] On the substrate, the composition is coated with a wire bar and cured in an oven at 60°C for 24 ...

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Abstract

The invention relates to a polyurethane-based aqueous dual-component polyurethane paint system and a use thereof. The composition contains an aqueous dispersion containing one or more OH functional group-containing compounds, and one or more hydrophobic or hydrophilic modified polyisocyanates, wherein a glass-transition temperature of the aqueous dispersion containing one or more OH functional group-containing compounds is higher than 20 DEG C. Compared with the existing paint system, the aqueous dual-component polyurethane paint system has excellent chemical reagent resistance and a fast drying rate.

Description

technical field [0001] The invention relates to the preparation and application of a water-based quick-drying two-component polyurethane coating composition with good chemical resistance. Background technique [0002] In the use of paint, the use of water as a solvent has increased significantly in recent years. A decisive factor in the development of this technology was environmental considerations. For example, using water as a solvent when applying paint to substrates can reduce the use of organic solvents, and can also greatly reduce the release of volatile organic compounds that can damage the ozone layer, improving the working conditions of users and reducing disposal. The cost of organic waste gas. [0003] Aqueous two-component polyurethane coating systems are disclosed in many cases in the prior art. However, their properties, such as chemical resistance, curing speed, hardness, etc., are generally inferior to those of solvent-based polyurethane coating systems. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/77C08G18/62D06M15/564
Inventor 朱德勇李金旗叶科
Owner COVESTRO DEUTSCHLAND AG
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