JPH0637314B2 - Anticorrosion method for glass filled with metal wire - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention provides a rust preventive coating on the exposed end surface of a metal wire rod-encapsulated glass, which is generated by a reaction between the metal wire rod and moisture in the outside air, acid gas or the like. It prevents rust, impairs the appearance, and suppresses the deterioration of glass strength caused by rust, and thus the occurrence of rust cracks.

(Problems with Prior Art) It has been known to apply wax or a viscous resin wave to the exposed end surface of the metal wire rod of glass, but there is a difference in thermal expansion between the glass and the metal wire rod or a metal wire rod at the time of cutting. However, there is a drawback in that a minute gap is generated due to the tensile cutting operation, etc., and even if the above-mentioned known means is applied, outside air easily enters into the gap to cause rust.

On the other hand, in JP-A-49-115038, a vaporized rust preventive agent is applied to the cut surface of a glass containing a metal wire, and in JP-A-47-39314, a low-viscosity non-drying rust preventive oil is applied and coated. All disclose that they can penetrate into the gap between the wire and the glass, thus preventing the formation of rust from the cut surface to the inside.

However, the former loses its rust prevention ability by vaporization and dissipation in a relatively short time. Also in the latter case, simply using a non-drying rust preventive method oil is likely to cause deterioration and labor, and is insufficient for long-term rust prevention.

The present invention solves these drawbacks, and an object of the present invention is to provide a method of rust-preventing a metal wire rod-encapsulated glass which is coated with rust-preventing oil suitable for long-term rust prevention.

[Means for solving problems]

The present invention relates to a rust preventive method for a metal wire rod-enclosed glass, in a method of coating a metal wire rod end face of the metal wire rod-enclosed glass with rust preventive oil, a metal wire rod protruding from a glass end face is refracted along the end face, and then Iodine value of 85 or less, saponification value of 200 or less, viscosity of 15
It consists of coating a rust preventive oil consisting of a non-drying oil of not more than a centistoke.

The iodine value of the rust preventive oil is determined by a known halogen adsorption method, and the saponification value is determined by a known hydrolysis method using an alkali hydroxide.
Viscosity is measured by a kinematic viscosity measurement method using a rotary viscometer.

In the present invention, rust preventive oils having an iodine value of more than 85 are prone to deterioration such as oxidation and hardening during long-term use, and to easily impair the rust preventive action. On the other hand, if it is 85 or less, the fluidity and wet adhesiveness are maintained for a long period of time and the deterioration is less likely to occur.

In addition, a viscosity of 15 centistokes (cst) or less is required in order to enter the minute gap between the glass and the metal wire by capillary action or the like. If it exceeds this, it is difficult to enter the gap. If it is more preferably 5 cst or less, invasion becomes extremely easy. The lower limit of viscosity is not particularly limited, but 2 cst
If it is less than 2, the coating film thickness will be thin and the exposed part of the metal wire may be easily rusted.

The saponification value relates to the decomposition and deterioration of rust preventive oil due to moisture.
A value of 0 or less is suitable, and a value of more than 200 tends to cause deterioration due to moisture or the like and cloudiness. If it is less than 170, the rust preventive oil inevitably becomes a viscous liquid or solid of high fatty acid ethnal, which increases the above-mentioned viscosity and tends to impair the fluidity. 170 because it makes rust prevention difficult
The above is preferable.

In the present invention, an appropriate additive such as an antioxidant such as sodium nitrite may be contained within a range that does not impair the various characteristics.

For coating the rust preventive oil on the glass end surface, known means such as brush coating, roller coating, spraying and dipping can be appropriately adopted.

In Applicant's Japanese Patent Application No. 63-8890, the applicant of the present invention proposes that a metallic wire rod protruding from the end face of a glass plate is bent along the end face to bend so that the protruding end of the wire rod protrudes from the coating rust preventive liquid. It was proposed to prevent the rust from advancing from the protruding end, to eliminate the adverse effects that the protruding portion makes the coating operation difficult or the glass is difficult to handle, but the above treatment was performed in the present invention. After that, a rust preventive oil composed of a non-drying oil having the above-mentioned characteristics is applied. That is, the non-drying oil has a low viscosity and easily penetrates into a minute gap between the glass and the metal wire, but makes thick coating of the glass end face difficult.
It is easy to expose the wire rod protruding end to the outside air. However, by refracting this along the end surface of the glass plate, coating and coating can be facilitated and rust generation from this portion can be suppressed.

〔Example〕

 The present invention will be described below with reference to examples.

Eight kinds of rust preventive oils shown in Table 1 were applied to the end faces of the glass and subjected to a rust preventive test. That is, for the glass with a metal wire rod of 30 cm mouth, after refracting the protruding portion of the metal wire rod on the end face,
Apply rust preventive oil to the end face with a brush and apply 50 ° C, 95% RH, 48
After holding for a period of time [in a constant temperature and constant humidity chamber], holding at room temperature [average 15 ° C] and normal humidity (average 40% RH) for 48 hours [outdoors] was repeated 6 cycles (hereinafter referred to as cycle test).

After that, the rusting condition of the metal wire rod was observed and classified into those in which no rust was observed (○) and those in which rusted (x).

On the other hand, after the cycle test, the rust preventive oil was also observed in the same manner and no discoloration was observed at all (○), and discoloration such as white turbidity was recognized (x).

In addition, the same rust-preventive oil-coated glass end face is closely adhered with interleaving paper and left outdoors for 7 days, and then peeled by hand, which is extremely easy to peel (○), difficult to peel, or rust-proof oil is stuck. Then, it was classified as a sheet (x) in which the interleaf paper was broken.

Furthermore, for another glass plate coated with the same rust preventive oil, soak it in colored water for 48 hours and then take it out to observe the inside of the colored water inside the glass (the minute gap between the glass and the metal wire). Was not observed (∘), and intrusion was observed (x).

The results show that, as shown in Table 1, the rust preventive oils of the present invention (Examples 1 to 4) are excellent in all tests, and it is clear that the rust preventive effect of the metal wire can be exerted for a long period of time.

On the other hand, the rust preventive oils used in Comparative Examples 1 to 4 do not satisfy all the rust preventive oil characteristics of the present invention, and none of them can exhibit sufficient rust preventive effect such as rusting observed in the cycle test. .

[Effect of the Invention] According to the present invention, by refracting the metal wire rod that has been projected from the end surface of the glass plate in advance, the wire rod protruding end is prevented from protruding from the coating rust preventive liquid and the rust is prevented from proceeding from the protruding end. In addition to making the coating operation of the rust preventive liquid easy and ensuring complete coverage,
Anti-corrosion oil penetrates deeply into the minute gap between the glass and metal wire,
In addition, it is possible to prevent the metal wire rod from rusting for a long time without being deteriorated for a long time.

Claims (1)

[Claims] 1. A method of coating a metal wire rod-exposed end surface of a metal wire rod-enclosed glass with rust preventive oil, wherein a metal wire rod protruding from the glass end face is refracted along the end face, and then the glass end face and the refracted metal wire rod are refracted. , Iodine value 85 or less, saponification value
A rust preventive method for a glass filled with a metal wire, which is characterized in that a rust preventive oil composed of a non-drying oil having a viscosity of 200 or less and a viscosity of 15 centistokes or less is coated.