Stock material or miscellaneous articles – Web or sheet containing structurally defined element or... – Composite having voids in a component
Patent
1995-08-18
1999-10-19
Chen, Vivian
Stock material or miscellaneous articles
Web or sheet containing structurally defined element or...
Composite having voids in a component
428327, 428421, 428422, 4283179, 427458, 427461, 427475, 427485, 427180, 4273722, 427375, 4273855, 427421, B32B 516, B32B 2728, B05D 106, B05D 112
Patent
active
059686421
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to an article having a fluororesin surface that has excellent water repellency and to which water drops, the soil entrained by these water drops, etc., do not adhere, and relates to a method for manufacturing said article.
DESCRIPTION OF PRIOR ART
Water repellency, weather resistance, stain resistance, and other such characteristics need to be imparted to the surface of many industrial devices, household devices, etc.. The method that has been used most often in the past to impart these surface characteristics is to roughen the surface of a conventional substrate by blasting or etching, treat it with a primer or the like, and then coat it with an enamel or another paint that contains fluororesin particles such as polytetrafluoroethylene (PTFE), which has excellent non-stick properties, then dry this coating and bake it at 350 to 400.degree. C. to create a fluororesin coating on the article surface.
It is known, however, that the water repellency of an article is greatly affected not only by the water repellency characteristics of the molding material, but also by the surface condition. Therefore, recent years have seen attempts at achieving better water repellency in an article by making the actual surface area greater than the apparent surface area by means of microscopic protrusions present on the article surface.
For instance, in Japanese Laid-Open Patent Application Hei 4-239633 is disclosed a method in which a water-and oil-repellent film whose surface is irregular is formed by chemically bonding an irregular layer, produced by mixing microparticles and silicate glass, to a polymer film layer that contains fluorocarbon groups and siloxane groups by means of these siloxane bonds.
In Japanese Laid-Open Patent Application Hei 4-283268, a polytetra-fluoroethylene oligomer with a molecular weight of about 8,000 to 10,000 is dispersed in a plating solution, and the oligomer is co-deposited on a plating film to form a water-repellent metal composite.
In Japanese Laid-Open Patent Application Hei 6-122838 is disclosed a water-repellent paint and a coating method in which a low-molecular weight polytetrafluoroethylene powder with a molecular weight of about 500 to 20,000 is admixed and dispersed in an acrylic silicone resin.
However, with a method that involves siloxane bonds, a step is required in which a water-repellent film is formed by means of the siloxane bonds after an irregular layer has first been formed, and the drawback to a plating method is that articles on which a water-repellent film can be formed are limited to those that can be plated. With a method in which a low-molecular weight PTFE is admixed and dispersed in an acrylic silicone resin, a special low-molecular weight PTFE that has been fluorinated all the way to the ends is required.
In light of this invention, the inventors perfected the present invention upon discovering that excellent water repellency is imparted by forming an irregularly porous material by the hard-to-exfoliate layering of high-molecular weight fluororesin particles having a specific diameter over one another and discovering a variety of methods for obtaining such water-repellent article.
Therefore, the object of the present invention is to offer an article, and a manufacturing method therefor, that has fluororesin surface with dramatically higher water repellency and stain resistance than those achieved with prior art.
DISCLOSURE OF THE INVENTION
The present invention is an article having a water-repellent fluororesin surface, which is characterized by having a water droplet roll angle tangent of no more than 50/500 and being composed of an amorphous porous material which has a maximum isopropyl alcohol (IPA) diffusion diameter of at least 8 mm and is formed by layering fluororesin particles with an average particle diameter of no more than 40 microns over one another.
The above-mentioned article having a water-repellent fluororesin surface can be manufactured, for example, by a method in which an article is co
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Chen Vivian
DuPont-Mitsui Fluorochemicals Co. Ltd.
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