JP4845834B2 - Method for preventing chip adhesion to the glass surface during glass processing - Google Patents

Description

  The present invention relates to a method for manufacturing a glass member, and more particularly, to a method for manufacturing a glass member in which adhesion of chips generated during glass processing to a glass surface is suppressed. More specifically, the present invention relates to a method of processing glass while preventing chips of submicron to several hundreds of microns generated during cutting, cutting or end face grinding of glass from adhering or adhering to the glass surface.

  Glass is used not only for general windows and bottles, but also recently, its use and applications in precision fields such as for television displays such as liquid crystal televisions and plasma display televisions, glass magnetic disks, and lenses are expanding. In these applications, a problem at the time of cutting, cutting or end face grinding is reattachment of chips generated during processing. If the reattached chips are left as they are, welding cannot occur.

  Conventionally, in order to prevent this reattachment, methods such as (1) performing the cutting step in running water, (2) applying a tape or the like at the cutting position, and peeling the tape after cutting have been attempted. However, in the method (1), even if the cutting step is performed in running water, minute chips remain attached to the glass surface. In the method (2), although the adhesion of the glass is eliminated, there are still problems such as remaining after the tape is peeled off and cleaning becomes extremely difficult, and the present situation is that the solution has not been completely solved.

  Patent Document 1 proposes a method for preventing scattering of fine glass fragments generated from a cut surface under the coating by forming a water-soluble polymer film on the cut surface of the glass. However, the chips are not generated, and the problems caused by the reattachment of the generated chips cannot be solved. Rather, since the chips that could not be scattered additionally adhere, there is a risk of increasing the amount of reattachment to the substrate.

Further, Patent Document 2 proposes a method of dicing by applying a surfactant. However, in the examples, only a neutral detergent for home use is described as the surfactant, and all the surfactants are used. The agent was not effective in preventing chip adhesion. It was important to select a specific surfactant to prevent chip adhesion.
JP-A-8-157236 JP-A-11-191540

  The problem to be solved by the present invention is to prevent submicron to several hundred micron chips generated during glass processing such as glass cutting, cutting or end face grinding from adhering to or adhering to the glass surface. .

  As a result of intensive studies for solving the above problems, the present inventor pre-attached a nonionic surfactant aqueous solution to the glass surface before processing the glass, and attached the nonionic surfactant. It has been found that a glass member can be produced while processing glass and removing glass chips generated by glass processing together with a nonionic surfactant while preventing chips from adhering to the glass surface. The present inventors have studied the effect of preventing chip adhesion under various conditions with respect to the temperature of the process, the cloud point of the nonionic surfactant aqueous solution, and the like, and have completed the present invention.

  Therefore, this invention provides the chip | tip adhesion prevention method to the glass surface at the time of the glass processing shown to the following items.

Item 1. (1) A step of attaching a nonionic surfactant aqueous solution to the glass surface in advance before glass processing (2) A step of processing the glass to which the nonionic surfactant aqueous solution is attached in the step (1), and (3) The manufacturing method of the glass member in which the glass chip adhesion was suppressed including the process of removing the glass chip produced by the said glass processing process (2) with nonionic surfactant aqueous solution.

  Item 2. Item 2. The method according to Item 1, wherein the step (1) is performed at a temperature equal to or higher than the cloud point of the aqueous nonionic surfactant solution.

  Item 3. Item 3. The method according to Item 1 or 2, wherein the cloud point of the aqueous nonionic surfactant solution is 10 to 60 ° C.

  Item 4. The removal of the nonionic surfactant and glass chips in the step (3) is performed using water having a temperature lower than the cloud point of the aqueous nonionic surfactant solution. The method described.

  The method of the present invention can suppress adhesion or adhesion of submicron to several hundred microns of chips generated during glass processing to the glass surface. Therefore, by using the method of the present invention, the glass cutting ability, cutting accuracy, and grinding accuracy are improved. Moreover, suppression of adhesion or adhesion of glass chips to the glass surface leads to an improvement in the yield of manufacturing the glass member, cost reduction, and man-hour reduction.

  Below, the detail of this invention is demonstrated in more detail based on embodiment.

  The present invention includes (1) a step of previously attaching a nonionic surfactant aqueous solution to a glass surface before glass processing (2) processing a glass to which a nonionic surfactant aqueous solution is attached in the step (1) And (3) a method for producing a glass member, including a step of removing glass chips generated by the glass processing step (2) together with a nonionic surfactant aqueous solution.

(1) Attachment process of nonionic surfactant aqueous solution to glass surface First, the method of this invention includes the process of making nonionic surfactant aqueous solution adhere to the glass surface previously before glass processing.

  In the adhesion process of the nonionic surfactant aqueous solution, at least a part of the glass surface is coated with the nonionic surfactant aqueous solution, so that glass chips generated in the next glass processing process adhere to the glass surface. Can be prevented.

  The glass used as a raw material in the method of the present invention is not particularly limited in terms of shape and composition, and for example, glass having various compositions such as a plate shape, a tube shape, and a tube shape can be widely used. In addition, these glasses may be coated on the surface.

  Examples of the nonionic surfactant attached to the glass surface include the following polyoxyalkylene surfactants: polyoxyethylene alkyl ether, polyoxyalkylene alkyl ether, polyoxyalkylene isotridecyl ether, polyoxyalkylene surfactant Oxyalkylene branched decyl ether, polyoxyalkylene lauryl ether, polyoxyalkylene tridecyl ether, polyoxyethylene fatty acid monoester, polyoxyethylene fatty acid diester, polyoxyethylene higher alcohol ether, polyoxyethylene polyoxypropylene block polymer, polyoxy Ethylene polyoxybutylene random block polymer.

  Examples of the polyoxyethylene alkyl ether include polyoxyethylene isodecyl ether, polyoxyethylene tridecyl ether, polyoxyethylene lauryl ether, polyoxyethylene oleyl ether and the like.

  Examples of polyoxyethylene isodecyl ether include Neugen SD-60 (average molecular weight: about 450) manufactured by Daiichi Kogyo Seiyaku Co., Ltd.

  Examples of polyoxyethylene tridecyl ether include Neugen TDS-30 (average molecular weight: about 300) manufactured by Daiichi Kogyo Seiyaku Co., Ltd.

  Examples of polyoxyethylene lauryl ether include Emulgen 108 manufactured by Kao Corporation (average molecular weight: about 500), DKS NL-15 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. (average molecular weight: about 300), and DKS NL-60 (average molecular weight: about 400).

  Examples of polyoxyethylene oleyl ether include Emulgen 409P (average molecular weight: about 700) manufactured by Kao Corporation.

  Examples of polyoxyethylene alkyl ethers other than the above include Neugen ET-65 and ET-115 manufactured by Daiichi Kogyo Seiyaku Co., Ltd. and Sannonic SS-70 manufactured by Sanyo Chemical Industries.

  As polyoxyalkylene alkyl ether, for example, Emulgen LS-106, MS-110 manufactured by Kao Corporation, Neugen ET-106A, ET-116B, ET-116C, DL-0206 manufactured by Daiichi Kogyo Seiyaku Co., Ltd., manufactured by Sanyo Chemical Industries, Ltd. Naroacty N-85 (average molecular weight: about 600), N-95 (average molecular weight: about 700), Sannonic FD-80 (average molecular weight: about 500), FN-80, FD-100 (average molecular weight: about 600) Cedran FF-160, FF-180, FF-200, FF-210 and the like.

  Examples of the polyoxyalkylene isotridecyl ether include Neugen TDS-30 (average molecular weight: about 300) and Neugen TDX-50 (average molecular weight: about 400) manufactured by Daiichi Kogyo Seiyaku Co., Ltd.

  Examples of the polyoxyalkylene branched decyl ether include Neugen XL-40 (average molecular weight: about 300), XL-60 (average molecular weight: about 400), XL-70 (average molecular weight: about 500) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Etc.

  Examples of the polyoxyalkylene lauryl ether include DKS NL-Dash400, DKS NL-Dash403, DKS NL-Dash408, Neugen LP-70 (average molecular weight: about 500) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. -80 (average molecular weight: about 600).

  Examples of the polyoxyalkylene tridecyl ether include Neugen TDX-50 (average molecular weight: about 400), TDX-50D (average molecular weight: about 400), and TDX-80D (average molecular weight: about 600) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Etc.

  Examples of the polyoxyethylene fatty acid monoester include Ionette MO-600 (average molecular weight: about 900) manufactured by Sanyo Chemical Industries.

  Examples of the polyoxyethylene fatty acid diester include Ionette DO-1000 (average molecular weight: about 1600) manufactured by Sanyo Chemical Industries.

  Examples of the polyoxyethylene higher alcohol ether include Emulgen 707 and 709 manufactured by Kao Corporation.

  Examples of the polyoxyethylene polyoxypropylene block polymer include New Pole PE-61 (average molecular weight: about 2000), PE-62 (average molecular weight: about 2200), PE-72 (average molecular weight: about 2000) manufactured by Sanyo Chemical Industries, Ltd. 2500).

  Examples of the polyoxyethylene polyoxybutylene random block polymer include Brember LUB-70 (average molecular weight: about 5800) manufactured by Sanyo Chemical Industries.

  An amine, a fatty acid, a preservative, a glycol solvent, an anionic surfactant, a cationic surfactant, and the like may be added as optional components to the nonionic surfactant aqueous solution.

  The concentration of the nonionic surfactant in the aqueous nonionic surfactant solution used in the present invention is not particularly limited, but is usually 0.1 wt% to 10 wt%, preferably 0.3 to 5 wt%. And particularly preferably 0.5 to 3% by weight. By using a nonionic surfactant aqueous solution in the above concentration range, a sufficient lipophilic layer is formed to prevent adhesion of glass chips on the glass surface, and the following glass chips and nonionic surfactant aqueous solution are formed. In the removing step, it is possible to sufficiently wash away the chips and to prevent the surfactant from remaining after washing.

  Although the preferable temperature in the adhesion process of the nonionic surfactant aqueous solution may vary depending on the cloud point of the nonionic surfactant aqueous solution described later, it is usually 10 to 70 ° C, preferably 10 to 60 ° C. .

  As a method for adhering the nonionic surfactant aqueous solution to the glass surface, a method generally used in the art can be widely used. For example, a method of immersing a raw material glass, application to the glass surface, spraying, showering And the like.

  The nonionic surfactant aqueous solution used in the present invention has a cloud point, and at a temperature equal to or higher than the cloud point, the aqueous solution becomes turbid and exhibits lipophilicity. Conversely, when the temperature is lowered below the cloud point, turbidity disappears and a transparent aqueous solution is obtained. Therefore, at a temperature higher than the cloud point, the nonionic surfactant aqueous solution forms a lipophilic layer on the glass surface, and is superior to adhesion of glass chips generated by the next glass processing step to the glass surface. Show the suppression effect. Therefore, it is preferable to perform the adhesion process of the nonionic surfactant aqueous solution to the glass surface at a temperature equal to or higher than the cloud point of the nonionic surfactant aqueous solution.

  As a method of performing the adhesion step at a temperature higher than the cloud point of the nonionic surfactant aqueous solution, a method of immersing the glass in a nonionic surfactant aqueous solution having a temperature higher than the cloud point, a cloud point higher than the cloud point. A method of spraying and showering a nonionic surfactant aqueous solution at a temperature of 1 to adhere to the glass surface and maintaining the glass surface at a temperature higher than the cloud point of the nonionic surfactant. Immerse in a non-ionic surfactant aqueous solution at a temperature or spray and shower a non-ionic surfactant aqueous solution at a temperature below the cloud point on the glass surface to adhere to the glass surface, making the glass surface non-ionic There are methods such as heating to a temperature equal to or higher than the cloud point of the surfactant, and any method may be used.

  Here, the cloud point of the nonionic surfactant aqueous solution used in the present invention is usually 10 to 60 ° C, and preferably 15 to 55 ° C.

  If the cloud point of the nonionic surfactant aqueous solution is too low, the suitable temperature range of water for washing away the nonionic surfactant described later is narrow, and the detergency becomes insufficient. In addition, when the cloud point of the aqueous nonionic surfactant solution is too high, in embodiments where the cloud point is heated above the cloud point, depending on the type of glass or the required accuracy, the impact of heat may be exerted, or the working environment may deteriorate. To do.

When the step of attaching the nonionic surfactant aqueous solution is performed at a temperature equal to or higher than the cloud point, the step (1) is preferably performed in the range from the cloud point to a temperature 30 ° C. higher than the cloud point, more preferably cloudy. It is carried out in a range up to a temperature higher than the cloud point and 20 ° C. higher than the cloud point, particularly preferably up to a temperature higher than the cloud point and higher than the cloud point by 10 ° C.
(2) Glass processing process The method of this invention includes the process of processing the glass which adhered the nonionic surfactant aqueous solution in the said process (1).

  The glass processing method is not particularly limited as long as glass chips are generated, and examples thereof include cutting, cutting, and end surface grinding.

  A glass member is formed by the glass processing step. The glass member produced in the method of the present invention is not particularly limited, and examples thereof include a member for a display such as a liquid crystal television and a plasma display television, a member such as a glass magnetic disk and a lens.

  In conventional glass processing, glass chips generated by the processing adhere and / or adhere to the glass surface. In the case of the method of the present invention, a part or all of the glass surface is a nonionic surfactant. Since it is coated with an aqueous solution, adhesion and adhesion of glass chips on the glass surface are significantly suppressed.

Similarly to the adhesion step (1) of the nonionic surfactant aqueous solution to the glass surface, the glass processing step is performed at a temperature equal to or higher than the cloud point of the nonionic surfactant aqueous solution in order to enhance the effect of suppressing glass chip adhesion. It is preferable to carry out at. As specific preferred temperature conditions, the same conditions as in the above step (1) can be employed.
(3) Removal step of glass chips and nonionic surfactant aqueous solution The method of the present invention comprises a step of removing the glass chips produced by the glass processing step (2) together with the nonionic surfactant aqueous solution. Including.

  Examples of the method for removing the nonionic surfactant and the glass chips include a method of flowing water, showering or spraying the processed glass, a method of immersing the processed glass in water and performing ultrasonic cleaning. Can do.

  Although the water temperature of the water used for the said removal process (3) is not specifically limited, Usually, 5-60 degreeC, Preferably it is 10-60 degreeC.

  In addition, since the nonionic surfactant aqueous solution used in the present invention exhibits high surface activity at a temperature below the cloud point, it is easier to remove with water.

  Therefore, it is preferable to perform the said removal process (3) using the water of the temperature below the cloud point of nonionic surfactant aqueous solution.

  In a preferred embodiment of the present invention, the removing step (3) is preferably in the range from below the cloud point to a temperature 30 ° C. below the cloud point, more preferably from below the cloud point to a temperature 20 ° C. below the cloud point. , Particularly preferably in the range from below the cloud point to a temperature 10 ° C. lower than the cloud point.

  As described above, the nonionic surfactant used in the present invention has a higher effect of suppressing the adhesion of glass chips to the glass surface at temperatures above the cloud point, and the glass chips at temperatures below the cloud point. At the same time, it is easily removed from the glass surface. Accordingly, in the method of the present invention, (1) the step of attaching the nonionic surfactant aqueous solution to the glass surface is performed at a temperature equal to or higher than the cloud point of the nonionic surfactant, and (3) glass chips and It is preferable to perform the removal process of the nonionic surfactant aqueous solution at a temperature lower than the cloud point of the nonionic surfactant.

EXAMPLES The present invention will be described in detail below using examples, but the present invention is not limited to the following examples.
[Test method]
In Examples 1 to 14, each test concentration aqueous solution of each nonionic surfactant was applied to a glass substrate, and the glass substrate was heated to be 5 ° C. higher than the cloud point of the nonionic surfactant aqueous solution, After cutting with a diamond blade, wash with tap water at a temperature 5 ° C. lower than the cloud point of the nonionic surfactant aqueous solution to visually check the chip reattachment status and the nonionic surfactant adhesion status. It was judged.

  Further, in Examples 15 to 19, each test concentration aqueous solution of each nonionic surfactant 5 ° C. higher than the cloud point was spray-coated on a glass substrate, and the glass substrate was sprayed from the cloud point of the nonionic surfactant aqueous solution. After maintaining at a high temperature of 5 ° C. and cutting with a diamond blade, it is washed with tap water at a temperature 5 ° C. lower than the cloud point of the nonionic surfactant aqueous solution, and the chip reattachment status and the nonionic interface The state of adhesion of the activator was judged visually.

  In Comparative Examples 1 to 11, when a nonionic surfactant is not used (in the case of only water), an anionic surfactant is used, and when a household neutral detergent is used, chip recycling The adhesion situation and the adhesion situation of the nonionic surfactant were judged visually.

  Table 1 shows test conditions for the examples and comparative examples.

In addition, the value of a cloud point shows the value at the time of test density | concentration.
[Criteria]
(Double-circle): Neither chip nor surfactant adheres.
○: There is a very small amount of chips and no surfactant.
X: Many chip reattachments and no surfactants attached.
XX: Both chips and surfactant remain.

  The test results of the example and the comparative example are shown in Table 1 as “chip and anti-redeposition property of surfactant”.

Claims (3)

(1) Before glass processing, a nonionic surfactant aqueous solution having a cloud point of 10 to 60 ° C on the glass surface in advance is a range from 10 to 70 ° C and a temperature higher than the cloud point and 10 ° C higher than the cloud point. step, and the glass swarf produced by (3) the glass processing step (2) processing a glass with attached non-ionic surfactant aqueous solution in the step of attaching (2) the step (1) at, Suppression of glass chip adhesion, including a step of removing water together with a nonionic surfactant aqueous solution using water at a temperature ranging from 5 to 60 ° C. and a temperature ranging from less than the cloud point to 10 ° C. lower than the cloud point. Manufacturing method of the made glass member. The nonionic surfactant is polyoxyethylene alkyl ether, polyoxyalkylene alkyl ether, polyoxyalkylene isotridecyl ether, polyoxyalkylene branched decyl ether, polyoxyalkylene lauryl ether, polyoxyalkylene tridecyl ether, The process according to claim 1, selected from oxyethylene fatty acid monoesters, polyoxyethylene fatty acid diesters, polyoxyethylene higher alcohol ethers, polyoxyethylene polyoxypropylene block polymers, polyoxyethylene polyoxybutylene random block polymers. The method of Claim 1 or 2 whose density | concentration of the nonionic surfactant in the said nonionic surfactant aqueous solution is 0.5 to 3 weight%.