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Superhydrophilic coating composition

A technology of hydrophilic coating and composition, applied in the field of transparent hydrophilic coating, can solve problems such as affecting the transparency of transparent coating

Inactive Publication Date: 2015-12-30
BEHR PROCESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another problem with conventional coating compositions is the compatibility and stability of the coating, which adversely affects the ability of the clearcoat to maintain its clarity over its service life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 2-

[0042] Example 2 - Clearcoat Coating Composition.

[0043] Table 2 provides representative compositions used to make the hydrophilic coating compositions as set forth above. Coating compatibility and stability are very important for maintaining the clarity of the clearcoat over its lifetime. Any flocculation of nanomaterials can change the particle size distribution and thus the aggregation of particles during the film drying process and will eventually cause whitening and chalking problems of the coated film.

[0044] Table 2.

[0045]

example 3-

[0046] Example 3 - Clearcoat Coating Composition.

[0047]Table 3 provides another representative composition for making the hydrophilic coating composition as set forth above. Note, 1.5% silica / binder is added.

[0048] table 3.

[0049]

[0050] Example 4 - Clearcoat Coating Composition.

[0051] Table 4 provides another representative composition for making the hydrophilic coating composition as set forth above.

[0052] Table 4.

[0053]

[0054] Example 5 - Clearcoat Coating Composition.

[0055] Table 5 provides another representative composition for making the hydrophilic coating composition as set forth above. Inorganic nanoparticles and photocatalytic metal oxide particles generally have hydrophobic surfaces. Surface treatment of these particles with silane coupling agents can modify the surface characteristics to allow for easier dispersion into water-based coating systems. These silane coupling agents have methoxy and ethoxy groups at one end, which can...

example 6

[0058] Example 6 - Simple composition for making a superhydrophilic coating:

[0059] The simplest formulation is provided in Table 2 to provide guidance for bringing together the main components, and therefore additives are skipped in the table. To make this simple recipe shown in Table 2, a VWRVOS16 electric overhead stirrer and 4 blade propeller mixing blades were used. First, add the silica sol to the container and start the mixer at 4 or greater on the dial to get a good mix. While mixing, slowly add the organic binder, mix for about 5 minutes to get a homogeneous mixture, and then add the photocatalytic TiO 2 Dispersion, mix for about 5 minutes to about 10 minutes to obtain a clear or translucent dispersion, adding water as a final item to equilibrate the formulation to the desired solids level. Mixing was continued for another 10 minutes to complete.

[0060] Clearcoat coatings dry to a clear film under ambient conditions. After sunlight exposure, the transparent fi...

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Abstract

A composition for forming a hydrophilic coating includes an organic binder having an average particle size from about 1 to about 100 nm and an inorganic binder having an average particle size from about 1 to about 40 nm. The composition further includes an inorganic photocatalyst that catalyzes an oxidation-reduction reaction. Characteristically, the photocatalyst includes a photocatalytic metal oxide having an average particle size from about 1 to about 50 nm. Advantageously, coatings formed from the composition have improved stain resistance, low contact angle, and resistance to dirt adherence, while maintaining a clear optical character.

Description

technical field [0001] The present invention relates to a hydrophilic coating, and in particular a transparent hydrophilic coating with good dirt pick-up resistance. Background technique [0002] The surface characteristics of the substrate can be altered in a number of ways, probably most easily by applying a clear coat. For example, the water permeability, dirt adhesion resistance, wettability and transparency properties of a material can be modified by suitable treatment of its surface. Various compositions have been developed for modifying the surface properties of substrates. Water-repellent, oil-repellent, anti-stain, anti-bacterial, anti-static, anti-fog, anti-scratch, and water-absorbent surface treatments and coatings are well-known commercial products. [0003] Stain resistance, water repellency and resistance to dirt adhesion are important features in clearcoat paint compositions. Conventional coating compositions have chalking and whitening problems after expo...

Claims

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Application Information

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IPC IPC(8): C09D1/12C08K3/00
CPCC08K3/00C09D5/00C09D5/16C09D1/00C09D183/02C09D7/67
Inventor 石金贞唐明仁李吉贵周树学武利民杨玲
Owner BEHR PROCESS
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