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Poly(vinyl alcohol) and silica nanoparticle multilayer coatings and methods

A technology of silica and nanoparticles, applied in chemical instruments and methods, coatings, other chemical processes, etc., can solve problems such as lack of wear resistance

Inactive Publication Date: 2016-01-13
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While acid-sintered nanosilica coatings have been shown to be acceptably stable against moisture and UV light, they do not possess sufficient abrasion resistance for some applications

Method used

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  • Poly(vinyl alcohol) and silica nanoparticle multilayer coatings and methods
  • Poly(vinyl alcohol) and silica nanoparticle multilayer coatings and methods
  • Poly(vinyl alcohol) and silica nanoparticle multilayer coatings and methods

Examples

Experimental program
Comparison scheme
Effect test

example

[0162] Material

[0163] "PET" (polyethylene terephthalate) 50 μm thick substrates were made from "SCOTCHPAR" available from 3M Company, St. Paul, MN.

[0164] "Primed PET" is a 98.5 μm thick PET film coated on one side of a polyvinylidene chloride (PVDC) layer.

[0165] "BOPP" is a 59.4 μm thick biaxially oriented polypropylene film made of Exon 4792 resin.

[0166] "HPFDFT" is an anti-fog freezer door film laminate commercially available from Sabic Innovative Plastics Pittsfield, MA, under the trade designation "LEXAN".

[0167] "PC" is a 250 μm thick polycarbonate film purchased from Mianyang Longhua Company Ltd., Mianyang City, China under the trade designation "PC-1811HC".

[0168] A "ceramic polymer hardcoat" coated on a 200 μm thick PET film substrate was prepared as described in column 10, lines 25-39 and Example 1 of US Patent 5,677,050 to Bilkadi et al.

[0169] "SHC1200" refers to a silica-filled formazan with 10-30 wt% solids (nominal 19 wt% solids) commercial...

preparation example 1

[0196] Preparation Example 1 (PE1)

[0197] R2105KURARAY and water were mixed in a 1:9 ratio (w / w) and heated at 90°C until dissolved. The mixture was cooled to room temperature and washed with 1.6M HNO 3 Acidify to pH 2.5.

preparation example 2

[0198] Preparation example 2 (PE2)

[0199] The colloidal silica dispersions NALCOTX 10693 and SILCORM-EM-3530 were mixed in a 7:3 ratio (w / w) based on percent solids. POLYSTEP B430-s (0.5% by weight, based on total solids) was added to the mixture with 3M HNO 3 Acidify to pH2.

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PUM

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Abstract

Articles having poly(vinyl alcohol) (PVA) and silica nanoparticle multilayer coatings are provided. More specifically, the articles include a substrate and a multilayer coating attached to the substrate. The multilayer coating includes a silica layer that is the outermost layer, the silica layer containing acid-sintered interconnected silica nanoparticles arranged to form a continuous three-dimensional porous network. The multilayer coating also includes a PVA layer disposed between a surface of the substrate and the outermost silica layer. The PVA and silica nanoparticle coatings can be used on a large variety of substrates and tend to be resistant to impacts, scratches, wet abrasions, soil and fog.

Description

technical field [0001] The present invention provides articles having multilayer coatings of poly(vinyl alcohol) and silica nanoparticles and methods of making the same. Background technique [0002] Accumulation of dust on engineered surfaces designed to function in outdoor environments can cause problems, such as on traffic signs, solar panels, and window panes, for example. Furthermore, such surfaces often include surface coatings or applied polymer films with specific functions. For example, traffic signs often feature retro-reflective surfaces that reflect light directly back to the source to enhance driver visibility. Solar panels often include coatings that reduce light reflection to improve solar energy utilization, and films that can be applied to window panes to stop fogging or reflect specific wavelengths of light, such as infrared light. Occasional condensation of water on such surfaces and the inevitable accumulation of dust can each impair a particular coatin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00B05D7/00C03C17/38C09K3/18C09D5/16C08J7/04C09D5/00C08J7/043C08J7/046C08J7/054C08J7/056
CPCC09D5/002C09D5/1618B05D7/54B05D2201/02B05D2507/00B05D2518/10C03C17/007C03C17/42C03C2217/425C09D5/1693C08J7/0423C08J7/054C08J7/056C08J7/043C08J7/046B05D5/00B05D7/544B05D7/546B05D7/584B05D7/586C09D5/1668C09D129/04
Inventor J·A·里德尔P·B·阿姆斯特朗K·金达尔S·J·卡彭特G·W·拉施曼辛W·R·达德利J·T·彼得林景乃勇
Owner 3M INNOVATIVE PROPERTIES CO