Protective coatings and methods of making and using the same

A coating and water-based paint technology, applied to roofs using flexible materials, chemical instruments and methods, roofs using tiles/slate tiles, etc., can solve problems such as insufficient storage life, troubles, environmental problems, etc., and achieve extended storage Stable, easy-to-apply effect

Inactive Publication Date: 2015-01-21
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many compositions developed for such applications rely on organic materials (e.g., volatile organic solvents) that may present environmental concerns and / or involve complex application processes
Furthermore, problems associated with insufficient shelf life continue to plague product developers of these compositions

Method used

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  • Protective coatings and methods of making and using the same
  • Protective coatings and methods of making and using the same
  • Protective coatings and methods of making and using the same

Examples

Experimental program
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example

[0161] All parts, percentages, ratios, etc. in the examples and in the remainder of the specification are by weight unless otherwise indicated. All contact angles reported in the Examples are static contact angles reported in degrees. Additionally, the following abbreviations and materials are used in the examples below:

[0162] Material :

[0163] base

[0164] TP1: Aluminum test panels with the following coatings: CORMAX 6EP e-coat, 708DM730 primer, 648DN027 black basecoat, and Du Pont RK8014 clearcoat from ACT Laboratories (Hillsdale, MI);

[0165] TP2: Aluminum test panels with the following coatings: CORMAX 6EP e-coat, 708DM730 primer, 648DN027 white basecoat, and Du Pont RK8014 clearcoat from ACT Laboratories (Hillsdale, MI);

[0166] TP3: Aluminum test panels with the following coatings: PC8000e-coat, 615S primer, Du Pont IMRON 6000 LOOO6H white base coat, and Du Pont 3440S clear coat from ACT Laboratories (Hillsdale, MI);

[0167]TP4: Steel test panels with th...

example 116

[0288] The coating composition is an aqueous dispersion formed by combining NPS1 (4 nm) and NPS5 (20 nm) silica nanoparticle dispersions at a weight ratio of 70 to 30 and a solids content of 10% by weight , then acidified with HCl. The anti-fouling effect of the dried coating composition containing nano-silica on the substrate after being subjected to the anti-fouling test is determined by Figure 3A (uncoated control half) and Figure 3D (coated half side) shown in the photo.

example 117

[0290] This example was prepared and tested according to the same procedure as described for Example No. 116, except that the nano-silica-containing coating composition used in this example was an aqueous dispersion of a core-shell structure made of Formed as follows: NPS5 (20nm) silica nanoparticle dispersion (shell) and (40nm) polyurethane dispersion (Neoree R960, available from DSM Corp.) (core) in a weight ratio of 70 / 30 (shell / core) and a solids content of 10% by weight, then acidified with HCl. The anti-fouling effect of the dried coating composition containing nano-silica on the substrate after being subjected to the anti-fouling test is determined by Figure 3B (uncoated control half) and Figure 3E (coated half side) shown in the photo.

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Abstract

Protective coatings are formed on a reflective surface of a substrate by depositing an aqueous coating composition including dispersed silica-containing nanoparticles; and removing at least a portion of the aqueous phase. In some embodiments, the aqueous coating composition includes an acid having a pKa of <3.5 in an amount effective to produce a pH of less than 5. In other embodiments, the aqueous coating composition includes at least one dispersed (co)polymer, which in some embodiments, forms core-shell particle having a dispersed (co)polymer core surrounded by a shell consisting essentially of silica nanoparticles. In some of these embodiments, the pH is at least 5. Also described are methods of making and using the coating compositions to impart soil and stain accumulation resistance and easy cleaning characteristics to light reflective substrates such as construction articles (e.g., roofing materials), light reflective surfaces (e.g. reflective films) and light transmissive surfaces (e.g., photovoltaic cells).

Description

[0001] Cross References to Related Patent Applications [0002] This application claims U.S. Provisional Patent Application No. 61 / 262,423, filed November 18, 2009, U.S. Provisional Patent Application No. 61 / 320,091, filed April 1, 2010, and U.S. Provisional Patent Application No. 61 / 320,091, filed October 7, 2010 Priority to Application No. 61 / 390,905, the disclosure of which is incorporated herein by reference in its entirety. technical field [0003] The present invention relates to protective coatings containing silica-containing nanoparticles, coated articles having such protective coatings, and making and using such protective coatings, especially on reflective surfaces. methods of protective coatings. Background technique [0004] Reflecting solar energy from roofs and other exterior surfaces of buildings has recently become more desirable for energy conservation purposes. Absorbed solar energy increases cooling energy costs within buildings. Additionally, in dens...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C09D5/33C09D175/04B05D5/06E04F13/00
CPCC09D7/1225E04D1/20C09D5/004C01B33/12C08K9/02C01B33/18C09D7/1266C09D7/1275C08K3/36G02B1/111C09D1/00C01P2004/64E04D5/10C01P2004/62B82Y30/00C01B33/1417C09D7/62C09D7/67C09D7/68Y10T428/259B05D5/06C09D175/04C03C17/001
Inventor 景乃勇白峰
Owner 3M INNOVATIVE PROPERTIES CO
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