JPH031785Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a resin-coated glass thermometer comprising a resin coating with excellent adhesiveness and chemical resistance.

[Technical background of the invention and its problems]

Conventionally, when a glass thermometer (hereinafter referred to as a thermometer) is dropped and damaged, glass fragments, mercury, and the like inside are scattered, which requires a lot of effort and is dangerous to recover. For this reason, many proposals have been made to cover the outer surface of the thermometer with a coating such as plastic to make it less likely to be damaged. For example, Japanese Utility Model Publication No. 50-20685 discloses a thermometer with a protective coating made of a composite film of polyurethane elastomer and epoxy polyamide resin;
Publication No. 32260 discloses a protection method in which an impact-resistant synthetic resin is dissolved in a solvent, a thermometer is immersed in this solution, and then further immersed in a different type of liquid (for example, water) and then air-dried to remove the solvent. A method of forming a coating is disclosed. However, with any of these well-known technologies, there is a problem that the adhesion between the thermometer and the resin coating is unreliable, and the resin peels off from the edges of the coating after a certain period of use. It was hot. In particular, thermometers that are frequently used in hospitals and the like are repeatedly immersed in disinfectant solutions, which causes severe peeling and deterioration of the strength of the resin film itself, making it difficult for the resin film to function as a protective film. It had the disadvantage that it could not be done.

[Purpose of invention]

The present invention has been made to eliminate the above-mentioned drawbacks, and an object thereof is to provide a glass thermometer with a resin coating provided with a protective resin coating that has excellent adhesion to the thermometer and has good chemical resistance.

[Summary of the idea]

A glass thermometer body with a rough surface formed on the outer surface and a protective coating covering the rough surface and the mercury tank are provided, and at least a portion of this protective coating is made of a silicone-based moisture-curing resin coating. This thermometer is made of glass and has a resin coating.

[Example of idea]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings. 1 is the glass thermometer body,
An outer cylindrical tube 2, a capillary tube 5 which communicates with the mercury bath 3 at the end of the outer cylindrical tube 2, forms a welded part 4 with the outer cylindrical tube 2 with solder glass, and extends into the outer cylindrical tube 2; It has a dial 6. Reference numeral 7 denotes a rough surface with unevenness formed on the outer surface of the outer cylinder tube 2, and is formed to have a rough surface that does not cause any trouble in reading the scale of the dial 6. A protective film 8 covers the rough surface portion 7 and the mercury tank 3, and is made of a plurality of layers, for example, three layers of a polymer compound.

Next, the molding procedure will be described. first. There are various methods for forming the rough surface portion 7 on the outer surface of the thermometer body 1 , such as surface polishing, honing, and chemical treatment, but in this embodiment, a dry honing method using mechanical treatment was adopted. That is, the mercury tank 3 and the parts of the outer cylindrical tube 2 that do not require a resin coating are masked with elastic parts such as insulating tape, and then the welded part 4 to the dial plate 6 except for the mercury tank 3 are masked. Honing is performed on the desired area up to 42℃ as shown in . The polishing material used was #600 Emily sand, the pressure was 2 Kg/cm ² , the spray distance was 100 m/m, the spray angle was 90°, and the processing time was 3 seconds.The honing nozzle was fixed, and the outer tube 2 to be treated was rotated and translated. Then, honing treatment was performed.

Next, for coating with the protective film 8 , the thermometer body 1 after the honing process is washed to remove fat and dust, and then immersed in the following various resin solutions in sequence. A coating is provided by this method. That is, (1) Solution A A 0.2% solution is prepared by adding isopropyl alcohol to a silane coupling agent (for example, SH6040 manufactured by Toray Silicone Co., Ltd.).

(2) Solution B Add dimethyl meformamide and the above-mentioned silane coupling agent to a polyurethane resin liquid (for example, OLESTAR NL5008 manufactured by Mitsui Toatsu Chemical Co., Ltd.) to prepare a 15% polyurethane and 0.1% silane coupling agent solution. .

(3) Solution C Moisture-curing silicone resin liquid (for example, silicone resin manufactured by Toray Silicone)
SR2410).

After preparing each of the above solutions A, B, and C, first, with the mercury bath 3 part of the thermometer body 1 facing downward, the head of the outer tube 2 is held between the mounting jig and immersed in solution A for a few seconds. The fabric is pulled up and air-dried to form the first layer 9 shown in FIG. Next, this was immersed in solution B according to the same procedure as above and air-dried to form a second layer 10.
Finally, the third layer 11 was formed by immersing it in the C solution in the same manner as above and air-drying it to form the protective coating 8 . The protective effect of this protective coating 8 could be confirmed through the following experiment. In other words, for chemical resistance and peeling resistance, for example, after soaking for 72 hours in Osban, Hibidene, Sterihyde, Milton, Hyperpal, etc. as disinfectants commonly used in hospitals, and observing the appearance, test from a height of 1 m. A drop test was conducted by dropping the product onto a concrete floor. As a result, good results were obtained in terms of appearance, with no peeling of the coating at all, and no cloudiness due to penetration of the disinfectant solution. In addition, regarding the drop test results, please refer to the protective coating 8
There were only cracks in the glass inside, and no small pieces or mercury were scattered.

In addition, in this example, the glass thermometer main body 1
The dry honing method has been exemplified as a mechanical means for forming the rough surface portion 7 on the outer surface of the material, but as a chemical method, for example, unnecessary portions may be sufficiently masked in a solution of hydrofluoric acid and sulfuric acid mixed at a ratio of 1:1. The thermometer may be immersed for about 30 minutes.

[Effect of idea]

As explained in detail above, the present invention includes a glass thermometer body with a rough surface formed on the outer surface, a protective coating that covers the rough surface and the mercury tank, and at least a portion of this protective coating is made of silicone. This is a glass thermometer with a resin coating, which is characterized by the use of a moisture-curing resin coating, so the protective coating is formed on the thermometer body with extremely high adhesion due to the rough surface formed on the outer surface of the thermometer body. This is very effective in preventing film peeling. In addition, because at least part of the top layer of the protective coating uses a silicone-based moisture-curing resin with excellent chemical resistance, repeated immersion in disinfectant solution may cause deterioration of the resin. It has the special advantage of being able to fully function as a protective film.

[Brief explanation of the drawing]

The figures show an embodiment of the present invention, with FIG. 1 being a longitudinal sectional view and FIG. 2 being an enlarged sectional view of section A in FIG. 1. 1 ... Thermometer body, 7... Rough surface portion, 8 ... Protective coating, 11... Silicone moisture curing resin coating.

Claims (1)

[Scope of utility model registration request] A glass thermometer body with a rough surface formed on the outer surface and a protective coating covering the rough surface and the mercury tank are provided, and at least a portion of this protective coating is made of a silicone-based moisture-curing resin coating. A glass thermometer with a resin coating.