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Structural coatings with dewetting and anti-icing properties, and processes for fabricating these coatings

A coating, pre-coating technology, applied in chemical instruments and methods, coating, transportation and packaging, etc., can solve problems such as non-durability of coatings

Inactive Publication Date: 2015-12-02
HRL LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Protrusions from a single layer of coatings can show good anti-wetting behavior, but such coatings are not durable due to their inorganic structure

Method used

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  • Structural coatings with dewetting and anti-icing properties, and processes for fabricating these coatings
  • Structural coatings with dewetting and anti-icing properties, and processes for fabricating these coatings
  • Structural coatings with dewetting and anti-icing properties, and processes for fabricating these coatings

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0151] This Example 1 demonstrates a urea-formaldehyde based anti-icing coating using polystyrene discrete templates and hexamethyldisilazane-treated silica nanoparticles. DAP The plastic resin glue is a product of DAP Corporation (Baltimore, Maryland, US). Hexamethyldisilazane-treated silica was obtained from Gelest Inc. (Morrisville, Pennsylvania, US). TritonX-100 was provided by Sigma-Aldrich (St. Louis, Missouri, US). Polystyrene colloids of 500 nm diameter were obtained from Bang's Laboratory (Fishers, Indiana, US).

[0152] Silica (320 mg) treated with hexamethyldisilazane was combined with DIH 2O (1.0g) was loaded into a 50mL plastic centrifuge tube. TritonX-100 (60 mg) was then added and the mixture was vortexed for 1 minute to evenly disperse the silica in the fluid. In a separate 15mL plastic centrifuge tube, weigh DAP powder (1.0g) and with DIH 2 O combination, then transferred to a mixture of silica and water. The vessel was rinsed with additional water (...

example 2

[0157] The wetting resistance of the coating of Example 1 was evaluated by measuring the contact angle between water and the coating. This data is in Figure 4 shown in . Figure 4 The upper image of , depicts the contact angle between water and the coating of Example 1. Figure 4 The bottom table of , shows the contact and rolling angles of the aluminum substrate, the polymer, and the polymer+silica as different controls for the behavior of the substrate and the behavior of the non-porous coating material, respectively.

[0158] The coating of Example 1 exhibited a contact angle of about 150° and a rolling angle of less than 10°. Only the coating with template porosity (Example 1) showed a large contact angle with a small rolling angle, and thus poor water wettability, which is desirable for a coating.

example 3

[0160] The freezing point depression of the coating of Example 1 was measured. The data is in Figure 5 , which indicates the freezing point of water droplets on the coating of Example 1 compared to the control. The aluminum substrate and polymer+silica are controls for the behavior of the substrate and the behavior of the non-porous coating material, respectively.

[0161] Only the coating with templated porosity and exposed nanoparticles (the coating of Example 1) showed a significantly lower water freezing temperature.

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Abstract

Durable, impact-resistant structural coatings with dewetting and anti-icing properties are disclosed. The coatings possess a self-similar structure with two feature sizes that are tuned to affect the wetting of water and freezing of water on the surface. Dewetting and anti-icing performance is simultaneously achieved in a structural coating comprising multiple layers, with each layer including (a) a continuous matrix; (b) porous voids, dispersed within the matrix, to inhibit wetting of water; and (c) nanoparticles, on pore surfaces, that inhibit heterogeneous nucleation of water. These structural coatings utilize low-cost and lightweight materials that can be rapidly sprayed over large areas. If the surface is damaged during use, fresh material will expose a coating surface that is identical to that which was removed, for extended lifetime.

Description

[0001] priority data [0002] This International Patent Application claims priority to US Patent Application No. 13 / 836,208 filed March 15, 2013, which is hereby incorporated by reference in its entirety. field of invention [0003] The present invention relates generally to durable, abrasion resistant anti-icing coatings for various commercial applications. Background of the invention [0004] Anti-icing coatings can have a significant impact on improving safety in many infrastructure, transportation and cooling systems. Among the many problems caused by icing, many are caused by the impingement of supercooled water droplets on solid surfaces. This type of icing caused by supercooled water (also known as freezing rain, atmospheric icing, or impact ice) is notorious for making roads slippery, damaging tree branches and power lines, and stalling airplane wings. [0005] When supercooled water impinges on a surface, icing can occur at the contact between the water and the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/18C09D7/12C09D201/00B05D1/36C09D7/62
CPCC08J7/04C08K3/36C09D5/00C09D7/1225C09K3/18Y10T428/24421C09D7/62
Inventor 亚当·格罗斯安德鲁·诺瓦克威廉·卡特
Owner HRL LAB
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