JPS603956B2 - Abrasive material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an abrasive material, and more particularly to an abrasive material that has an excellent effect of preventing glare caused by polishing debris from an object to be polished.

Conventionally, commonly used abrasive materials are made by adhering artificial or natural abrasive mineral particles to a paper or cloth surface treated with a glue such as a synthetic resin using a thermosetting synthetic resin adhesive.

If you use this type of abrasive to polish soft metals, plastics, etc., the chipped shoulder of the object being polished will stick to the abrasive paper or cloth, causing scratches, even if the low-grain cutting edge has not yet become completely dull. Regardless, the polishing ability tends to deteriorate. In order to improve these defects, fine particles of fluororesin such as tetrafluoroethylene polymer, tetrafluoroethylene-16-fluoroethylene copolymer, and trifluorochloroethylene polymer are applied to the surface of the abrasive material along with an adhesive. A method of adhesion has been proposed (Japanese Patent Publication No. 46-32912), but since fluororesin does not have good adhesion to the base material no matter what adhesive is used, it may peel off during polishing. The effect quickly disappears. Although it is possible to apply the fluororesin by dissolving it in a solvent, no practical solvent that exhibits good solubility for the fluororesin has been known to date. It is also possible to melt and attach fluororesin, but since it has a relatively high melting point (32,700 for tetrafluoroethylene polymer), the base material often cannot withstand such high temperatures. As a result of repeated research on various compounds, the inventors have discovered a fluorine compound that has a barfluoroalkyl group having 4 to 21 carbon atoms, contains fluorine at a ratio of 3% by weight or more, and is soluble in organic solvents. The present inventors have discovered that forming a coating on the surface of an abrasive material can have a surprising effect on preventing clogging of the abrasive material, and have completed the present invention.

Suitable fluorine compounds used in the present invention have 4 to 21 carbon atoms.
, preferably a compound having 8 to 21 perfluoroalkyl groups.

A compound having such a long-chain perfluoroalkyl group exhibits good water and oil repellency, stain resistance, etc., and is therefore presumed to be effective in preventing clogging. Further, the fluorine compound used in the present invention must contain fluorine in a proportion of 3% by weight or more, preferably 4% by weight or more.

If the fluorine content is too low, the clogging prevention effect will not be sufficiently exerted, which is disadvantageous. Furthermore, it is desired that the fluorine compound used in the present invention is soluble in an organic solvent.

When treated with an aqueous solution or aqueous dispersion of a fluorine compound, there is generally poor compatibility between the abrasive mineral and water, and water has a weak affinity for the mineral, whereas when treated as an organic solution, the affinity of the liquid for the mineral is low. There is a strong affinity for
Performance also improves. Specific examples of fluorine compounds having the above-mentioned properties used in the present invention include the formula: RfS02
N(C2day5)-C ratio CH200CCH=C ratio, RfC
H2CH(OH)CH2-00CCH =CH2, Rf
CH2CH(OCOCH3)CH2-00CC(CH3
)=CH2 or RfCQCday200CCH=CQ [wherein, Rf represents a straight or branched perfluoroalkyl group having 4 to 21 carbon atoms.

A homopolymer of a polymerizable monomer or a copolymer with another polymerizable monomer represented by the formula: [wherein, Rf has the same meaning as above.

A ring-opened copolymer of a fluorine-containing epoxide and an acid anhydride such as maleic anhydride, succinic anhydride, or phthalic anhydride, represented by the formula: (where n represents 1, 2, or 3.

), or relative to R Examples include compounds that can be used.

Along with these fluorine compounds, silicone oil, fluorine oil,
Non-ionic, cationic or anionic surfactants and the like can be used.

As the organic solvent, trichlorotrifluoroethane, tetrachloro-1,2-difluoroethane, m-xylene hexafluoride, methylchloroform, isopropanol, acetone, etc. can be used alone or as a mixture.

To treat abrasive materials (abrasive cloth, abrasive paper, etc.) with fluorine compounds, the abrasive material may be immersed in a solution prepared by dissolving the fluorine compound and other additives in an organic solvent, or it may be sprayed with an air spray or It can be applied by brushing.

The solvent can be evaporated by air drying or by about 100 to 15
Perform by overflowing to 0q0. Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples.

In the examples, parts refer to parts by weight unless otherwise specified. Example 1 A 1% by weight trichlorotrifluoroethane solution of a terpolymer consisting of 95 parts, 2.5 parts, and 2.5 parts was applied to an abrasive cloth belt (manufactured by Belstar Polishing Machine Industry Co., Ltd.).

Hard abrasive particle size 80 mesh. Dimensions: 10 enemies x 915
(side) and air dry. Example 2 (n is 5 to 9
A 1% by weight trichlorotrifluoroethane solution of a mixture consisting of 0.5 parts (an integer of ) and 0.5 parts of silicone oil (Toray Silicone SH200) is brushed onto the same abrasive cloth belt as in Example 1 and air-dried.

Example 3 1:1 of C8F・7CH29 Muji2 and succinic anhydride
A 1% by weight solution of the ring-opened copolymer in trichlorotrifluoroethane is brushed onto the same abrasive cloth belt as in Example 1 and air-dried.

Comparative Example 1 Tetrafluoroethylene resin aqueous suspension (trade name: Polyflon Dispersion D-1.

A mixture of Daikin Industries, Ltd.) 22, phenolic resin (trade name: Hytanol 4010, Hitachi Chemical Co., Ltd.) 10 and Suikiyu was applied with a brush onto the same abrasive cloth belt as in Example 1, and air-dried. The belts treated as in Examples 1 to 3 and Comparative Example 1 above are subjected to an OB full-pressure sander.

SS at peripheral speed 1100m/min during grinding pressure 6k9/10 portside
27 square pieces (elevation angle of 15.8) were polished, and the weight loss of the square pieces per minute was measured as the amount of polishing per minute, which was used as a measure to prevent eye-rolling. The results are shown in Table 1. Table 1

Claims (1)

[Claims] 1. A perfluoroalkyl group having 4 to 21 carbon atoms is present on the surface of an abrasive material made by adhering abrasive mineral particles to a base material,
An abrasive material containing fluorine in a proportion of 30% by weight or more and forming a film of a fluorine compound soluble in an organic solvent.