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Substrate coating comprising a complex of an ionic fluoropolymer and surface charged nanoparticles

A nanoparticle and polymer technology, applied in the field of coated products, can solve problems such as damage and reduce the mechanical strength of fluoropolymer substrates, and achieve the effect of reducing water absorption and improving moisture transmission.

Active Publication Date: 2015-04-29
W L GORE & ASSOC GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In addition, these methods focused on directly modifying the surface (such as etching, plasma or corona treatment, irradiation, etc., which were developed to improve their adhesion) are destructive to the substrate and accompanied by delamination of the substrate surface. fluorine and reduce the mechanical strength of fluoropolymer substrates

Method used

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  • Substrate coating comprising a complex of an ionic fluoropolymer and surface charged nanoparticles
  • Substrate coating comprising a complex of an ionic fluoropolymer and surface charged nanoparticles
  • Substrate coating comprising a complex of an ionic fluoropolymer and surface charged nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0335] 198g of Clevios TM P (formerly known as P, 1.02wt% intrinsically conductive polymer PEDT / PSS [poly(3,4-ethylenedioxythiophene) poly(styrenesulfonic acid)] solid dispersion in water, the average swelling particle size d50 is about 80nm , product information see brochure from H.C Starck) and mixed with 396 g of ethanol. 62g of A solution of F 950 in ethanol (ionomer, Asahi Glass Chemical-AGC, 6.3% solids) was added to 200 g of Clevios with stirring TM P / water / ethanol dispersion.

[0336] Use Meyer rod 70 equipment (Mayer bar 70 setup) to coat the dispersion on ePTFE membrane (average flow pore diameter: 0.602 μm, Gurley: 3.5s, thickness: 75 μm, unit area weight (area weight): 42.8g / m 2 ) to get the overall coating on it.

[0337] After drying at 140°C, the measured deposition is 1.5 g / m 2 . The air permeability of monolithically coated ePTFE is 0. The measured surface resistance of the coated surface was 22 kΩ / □.

[0338] This example demonstrates an antistati...

Embodiment 2

[0344] With 198.2g of Clevios TM P (the same as used in Example 1), 62.3g of A mixture of F 950 ethanol solution (6.3% solids, ionomer, AGC) and 396.2 g of ethanol coated ePTFE membrane (average flow pore size: 490 nm, Gurley: 7s, thickness: 74 μm, weight per unit area: 36.8 g / m 2 )superior. After drying at 140°C, the measured deposition is 0.4 g / m 2 .

[0345] MVTR was measured after coating and repeated at the same point for 5 days (results are shown in Table 1).

Embodiment 3

[0347] According to Example 1 with Clevios TM P and Ethanol solution of F 950 (ionomer, AGC) dispersion coated ePTFE membrane (average flow pore size: 0.195 μm, Gurley: 12s, thickness: 34 μm, weight per unit area: 20.6 g / m 2 ).

[0348] After drying at 140°C, the measured deposition is 0.3 g / m 2 . The coating thickness measured by cross-sectional SEM was 0.5 to 1.0 μm, MVTR see Table 1. The contact angles to water measured after 5 s and 30 s were 125.9° and 125.4°, respectively.

[0349] Table 1

[0350]

[0351] Examples 2 and 3 passed the SUTER test (pressure: 0.2 bar, 2 minutes). The coated membrane is waterproof.

[0352] Measuring the MVTR of the membrane showed that the MVTR did not change over time. For these ultrathin bulk layers, the MVTR values ​​are consistent with the measured MVTR values ​​of the uncoated ePTFE membranes. Examples 2 and 3 illustrate antistatic hydrophobic and water repellent coatings on different ePTFE membrane structures.

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Abstract

The present invention relates an article comprising a non-conductive substrate and a coating thereon comprising a complex of an ionic fluoropolymer and a counter-ionic agent which comprises surface charged nanoparticles, to a process for the production of a coating on a non-conductive substrate comprising the steps of: a) preparing a mixture of an ionic fluoropolymer or a precursor thereof and surface charged nanoparticles or a precursor thereof, b) applying the mixture prepared in step a) onto the substrate, and to the use of such an article for the manufacture of a garment, a textile structure, a laminate, a filter element, a venting element, a sensor, a diagnostic device, a protective enclosure, or a separation element.

Description

technical field [0001] The present invention relates to an article comprising a substrate and a coating on the substrate comprising an ionic fluoropolymer and surface charged nanoparticles, to a method of making such a coating, and to the coating in Use to improve various performance aspects of substrates. Background technique [0002] Coating substrates is known in order to impart desired properties to the coated substrates, such as water resistance, chemical resistance, fire retardance, and the like. However, most of the concepts and coatings so far have only focused on the improvement of specific properties, without considering the need to impart multiple properties to the substrate and to adjust and balance these properties. [0003] For example, polyester and / or polyurethane coatings on expanded polytetrafluoroethylene (ePTFE) substrates to improve stain resistance to chemicals (such as those contained in sunscreen liquids, cosmetics) (US 4,194,041 and US 6,074,738). ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04C08J7/16C09D127/12C08J7/043C08J7/044C08J7/046C08J7/05C08J7/056
CPCB82Y30/00C08G65/007C08G2650/48C08J7/16C08J2327/18C08J2427/00C09D171/02Y10T428/265Y10T428/249955Y10T428/249991Y10T428/31504Y10T428/31544C08J7/0427C08J7/05C08J7/043C08J7/046C08J7/056C08J7/044C08J2427/12
Inventor 沃尔夫冈·布格尔鲁道夫·施特夫
Owner W L GORE & ASSOC GMBH