Abrasive tool making process – material – or composition – Impregnating or coating an abrasive tool
Patent
1997-03-21
1998-03-10
Jones, Deborah
Abrasive tool making process, material, or composition
Impregnating or coating an abrasive tool
51298, 51306, B21D 334
Patent
active
057256179
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to abrasive articles. In particular, the present invention relates to abrasive articles containing an encapsulated lubricant therein.
The treatment of surfaces in surface finishing operations, for example, can be accomplished using any of a variety of surface treating articles to accomplish the desired treatment. The use of nonwoven articles in such applications is known. When nonwovens are used in the treatment (e.g., finishing) of metallic surfaces, a liquid or solid lubricant is applied to the nonwoven to improve the abrasive power of the article and to prevent "abrasive burning" or discoloration of the treated surface caused by the heat generated during the surface treating operation. The application of lubricant to the nonwoven or to the surface can be accomplished in several ways. For example, a lubricant can be applied directly to the nonwoven or to the surface being treated at various intervals during the finishing operation. Such an application of the lubricant, however, is unsatisfactory because the lubricant can splatter during the operation, especially under the operation of high speed surface treating equipment. Additionally, the lubricant must be applied frequently to maintain a desired level of lubrication.
It is desirable, therefore, to provide an article which can be used in the surface treatment of metallic surfaces and the like wherein the article can be used, without the separate application of lubricant. Preferably, it is desirable to provide a surface treating article comprising a nonwoven substrate having a source of lubricant incorporated within the substrate so that the lubricant will automatically become available during the use of the article in surface treating operations.
The literature describes a variety of surface treating articles which include encapsulated lubricants and the like. Japanese Patent Laid-Open Publication No. Sho 62-152679 discloses abrasive materials including a lubricant encapsulated in an envelope made of inorganic substances. The disclosed envelope is porous with pore sizes of several tens to several hundred angstrom, so that a liquid lubricant may not be completely sealed in the capsule ("Recent Microcapsulation Technology" p. 131, edited by Integrated Technology Center).
Japanese Utility Model Laid-Open Publication Nos. Sho 63-32761 and 63-32762 disclose nonwoven abrasive materials including a lubricant encapsulated in an envelope of acrylic resin. The acrylic resin has a low glass transition temperature, requiring the use of a crosslinking and shows poor solvent and heat resistance because of a low crosslinking density. Consequently, the acrylic resin envelope may easily be dissolved by an organic solvent or melted by heat normally used in the manufacture of the nonwoven abrasive materials.
Japanese Utility Model Laid-Open Publication No. Sho 63-32763 discloses nonwoven abrasive materials with a lubricant encapsulated in glass capsules. The glass capsules are produced by heat-fusing a glass at a temperature higher than its melting point, potentially causing the lubricant to decompose during the preparation of the capsules. Additionally, the use of glass presents a potential safety hazard.
U.S. Pat. No. 3,502,453 (Baratto) discloses a resin bonded wheel comprising thermosetting resin capsules containing a lubricant to reduce grinding friction. The wheel, however, is not suitable for precision abrasion operations because of its relative inflexibility. Additionally, the lubricant containing capsules may not break in a uniform manner, thereby lowering the efficacy of the lubricant in various applications.
Accordingly it is desirable to provide a deformable surface treating article having an encapsulated lubricant which provides satisfactory lubricity during surface treating operations without the need for additional lubricants and without exhibiting the aforementioned problems inherent in the various prior an articles. Preferably, such a deformable surface treating article comprises a nonwoven substrate with the aforementioned
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patent: 5306319 (1994-04-01), Krishnan et al.
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Hagiwara Hironori
Yamato Ikuko
Griswold Gary L.
Jones Deborah
Kirn Walter N.
Minnesota Mining and Manufacturing Company
Pastirik Daniel R.
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