SU1162862A1 - Coolant for polishing ceramics - Google Patents

Abstract

LUBRICATING LIQUID FOR POLISHING CERAMICS, containing mineral oil and surface-active substance, characterized in that, in order to improve the quality of the treated surface, the liquid contains polyethylene glycol monostearate, polyethylene glycol monooleate and polymethylene polyethylene glycol as a surfactant. in the following ratio, wt.%: Polyethylene glycol monostearate. 3-4 Polyethylene gels, monoxole monolate 3-4 Polymethylsiloxane liquids (O bone 0.08-0.1 Mineral oil Rest

Description

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N9 The invention relates to lubricating coolant (coolant) liquids used in polishing ceramics, in particular in flat polishing with diamond pastes of substrates of high alumina ceramics used in the radio industry. Known coolant for polishing alcohol-based ceramics with the addition of water and glycerin C. This coolant has good cooling, but low lubricating properties. It is well rinsed off, but slowly dispersing1) polishing paste, which contains fatty acids (oleic, stearic), the closest in composition and to the achievable result of the invention is coolant 22 for polishing ceramics of the following composition, wt.%: Oleic acid 2.5 Mineral malo. 97.5 However, the adsorption effect created by oleic acid is small, since its surface-active properties are poorly expressed. Due to this, the addition of oleic acid does not give a significant improvement. productivity and quality of processing. In addition, oleic acid adsorbed by the treatment products accumulates in the grooves of the sludge bed and thermally decomposes with the release of resinous substances. The clearing of the sludge leads to sticking of it onto the lap and deterioration of the removal of the processed products from the grinder. When the primer grooves overflow with sludge, defects (scratches) appear on the surface to be treated. Periodic washing of the primer can reduce the number of scrap on the scratches, but at the same time the productivity of the process decreases. In addition, the oleic acid film is difficult to remove from solid surfaces and it is necessary to use flammable and toxic petroleum solvents to wash the polishing compound: kerosene, gasoline. The aim of the invention is to improve the quality of the treated surface of products. This goal is achieved by the fact that the coolant polishing liquid for ceramics containing mineral oil and surfactant contains the last one polyethylene glycol monostearate, polyethylene glycol monooleate and additionally polymethylsiloxane liquid in the following ratio of components, wt.%: Polyethylene glycol monostearate 3-4 polyethylene glycol -4 Polymetipsiloxane liquid 0.08-0.1 Mineral oil Remaining Polyethylene glycol monostearate (GOST 8980-75j and polyethylene Licole monooleate (TU-6-14-314-75) are good emulsifiers and dispersants. They intensify the processing process and prevent aggregation of diamond and sludge grains. Polymethylsiloxapic liquid (ICP-200A improves the color of polishing and reduces foaming in the coolant. During preparation cooling lubricant, the calculated amounts of the components are loaded into the container and mixing is carried out until the composition is completely homogenized (l215 min}. Table 1 presents the proposed composition of the coolant. The proposed coolant compositions 1-5 and the well-known 6 12J were tested when polishing high-alumina ceramics substrates. Coolant tests were carried out on grinding and polishing machine ZShP-350. A horizontally rotating disk — grinding in with a diameter of 320 mm and concentric rectangular grooves for sludge removal was made of gray cast iron MF 15-32. The parts to be processed were glued with rosin-shellac mastic on steel satellite disks and superimposed on the lap on top. With the help of a driver and a boom, the satellite was pressed to the lap during processing. The working movement of the satellite is returnable. Processing mode: Priter rotation speed, rpm Number of double strokes of the driver with a satellite per minute50 Specific pressure on the part, kg / cm 1 The processing time of all parts was assumed to be constant and equal to 15 minutes. Microchip substrates were processed. The size of the substrate in terms of 60 X 48 mm, thickness I mm. The substrate material is high-alumina ceramics polycore. The initial surface finish of the substrate after grinding corresponded to Grade 6. A commercial diamond paste with a grain size of 5/3 on an organic basis, AFM 5/3 POM, was applied, which was applied to the processed parts by spreading. Cooling lubricant was applied to the lap with periodic irrigation. The test results are shown in table 2. As can be seen from the table. 2, the number of compliant with unsatisfying technical requirements for surface quality has decreased during application; we offer coolant from 16 to J-11%, i.e. yield increased by 5-6%. When the content of surfactant in the coolant is less than 6 wt.% The adsorption effect and dispersion is

Table D 624, the effect of coolant is insufficient to stabilize the process of poly- forging on the quality of processing. It is impractical to increase the surfactant content in excess of 8 wt.%, Since the results achieved from this practically do not change. By adding more than 0.10% polymethylsiloxane fluid, the washability of the coolant fluid is impaired. The proposed coolant by reducing scrap when polishing ceramic products makes it possible to increase the actual productivity of the process. As shown by tests using the proposed coolant, the excess sludge is spontaneously removed from the rotating ground by centrifugal forces. Slurry on the lap was not observed, unlike the known coolant. In addition, it was found that the required quality of parts was achieved before the expiration of the set processing time. Concentrations of surfactants used in the proposed coolant make it possible to wash off the sludge from the treated parts and priter with water. With the introduction of water, the mineral oil is emulsified and easily removed along with the sludge. This makes it unnecessary to use flammable and toxic petroleum solvents (kerosene or gasoline) for cleaning.

Polyethylene glycol Monooleate Polymethylsiloxane liquid Mineral oil Up to 100 To 0.05 0.2 100 To 100 To 100 To 100

Table 2

Claims (1)

LUBRICANT COOLANT FOR CERAMIC POLISHING, containing mineral oil and surfactant. essentially, in order to improve the quality of the treated surface, the liquid as a surfactant contains polyethylene glycol monostearate, polyethylene glycol monooleate and, in addition, polymethylsiloxane liquid in the ratio of components wt.%: Polyethylene glycol monostearate Polyethylene glycol monooleate Polymethylsiloxane liquid Mineral oil at the following> 3-4 3-4 0.08-0.1 Else>