JPH09206606A - Physicochemical machinery made of glass and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain physicochemical machinery excellent in heat and pressure resistance and chemical resistance and capable of preventing the scattering of glass pieces at a time of breakage by providing a fluoroplastic coating layer on the outer surface of a physicochemical machinery main body made of glass. SOLUTION: In order to enhance the safety of a pressure-resistant bottle, a reaction container, a centrifugal sedimentation tube or an ampule used in a physicochemical experiment, a coating layer 2 with a thickness of 40-60μm composed of fluoroplastic is provided to the outer surface of a physicochemical machinery main body 1 made of glass. That is, a coating process applying fluoroplastic paint to the outer surface of the physicochemical machinery main body 1 made of glass in a thickness of about 15-20μm and a process drying the fluoroplastic paint after coating are repeated a plurality of times to form the coating layer 2 with desired thickness and, further, the physicochemical machinery main body 1 is introduced into a baking furnace to be gradually raised in temp. to be baked and subsequently gradually cooled in the baking furnace. By this treatment, the safety of the physicochemical machinery main body 1 is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a glass-made physics and chemistry experiment instrument having improved safety such as a pressure resistant bottle, a reaction vessel, a centrifugal settling tube, an ampoule and a chromatographic column used in physics and chemistry experiments.

[0002]

2. Description of the Related Art In recent years, resins such as vinyl chloride resins have been used for window glass and glass bottles as beverage containers in order to impart impact resistance or to prevent glass fragments from scattering at the time of breakage. It was sometimes coated. When such a resin coating is applied,
Even if the glass is damaged due to an accident or the like, it is possible to prevent the glass pieces from scattering and increasing the risk because the glass is coated with the resin.

[0003]

On the other hand, glass physics and chemistry equipment such as pressure bottles, reaction vessels, centrifugal settling tubes, ampoules, chromatographic columns, etc. used in physics and chemistry experiments are heated more than ordinary glass products. In many cases, a load such as pressure is applied, and since chemicals and dangerous substances are handled, it is desirable to use the above vinyl chloride resin, which has low heat resistance and chemical resistance, even though it is desirable to apply the above coating No coating was possible.

In recent years, fluororesins having excellent heat resistance and chemical resistance have been used by coating products in various fields, and such fluororesins are coated on the above-mentioned physicochemical equipment. If possible, it is extremely preferable from the viewpoint of heat resistance and chemical resistance.

However, since this fluororesin has a property of poor adhesion to other substances, when it is applied to a metal, for example, the surface of the base metal is subjected to sandblasting or the like to roughen the surface. The surface treatment was performed. Therefore, it is difficult to apply to a glass surface that is smoother than metal, and when the glass surface is subjected to a surface treatment such as roughening, the transparency of the glass is impaired and the contents are visually inspected from the outside. It is difficult to apply such a fluororesin coating to glass-made physics and chemistry equipment, because the characteristic of physics and chemistry equipment that can be done is lost.

The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a physics and chemistry instrument which is excellent in heat and pressure resistance and chemical resistance and which can prevent glass fragments from scattering at the time of breakage. .

[0007]

[Means for Solving the Problems]

(Constitution) The present invention has been made in order to solve such a problem.
The glass-made physics and chemistry equipment and the method of manufacturing the glass-made physics and chemistry equipment are characterized by the glass-made physics and chemistry equipment body 1 being provided with a coating layer 2 made of a fluororesin on the outer surface of the glass-made physics and chemistry equipment body 1. .

The manufacturing method is characterized in that an application step of applying a fluororesin paint to a thickness of about 15 to 20 μm on the outer surface of the glass-made physicochemical equipment 1, and a drying step of drying the fluororesin paint after application. The process is repeated a plurality of times to form a coating layer 2 having a desired thickness, and the physics and chemistry equipment body 1 having the coating layer 2 is placed in a firing furnace and then gradually heated to be fired, and then in the firing furnace. It is to cool gradually.

(Function) As described above, the coating layer made of fluororesin is formed on the outer surface of the physics and chemistry equipment 1 made of glass.
Since 2 is provided, even if a physical shock is applied to the physics and chemistry equipment 1 and the physics and chemistry equipment 1 is damaged such as a crack, the coating layer 2 on the outer surface does not immediately break the glass pieces. Therefore, it is possible to prevent the glass pieces and the contents from scattering.

Further, a coating step of coating the outer surface of the physics and chemistry equipment 1 made of glass with a fluororesin coating thinner than when coating a normal metal having a thickness of about 15 to 20 μm,
By repeating the drying process to dry the fluororesin paint after application multiple times to form the coating layer 2 with the desired thickness, the fluororesin paint coating is removed even on a smooth glass surface that has not been roughened. It can be provided in a good state without causing poor adhesion or adhesion.

Further, since the fluororesin particles contained in the fluororesin paint are about 100 to 200 mesh or less, the adhesion of the fluororesin paint becomes good, and the smooth glass which is not roughened. It is possible to form the coating layer 2 that does not easily peel off even when applied to the surface.

Further, since the physics and chemistry equipment 1 having the coating layer 2 is put in a firing furnace to gradually raise the temperature to be fired, and then gradually cooled in the firing furnace, it is not possible to endure a sudden temperature change. The coating layer 2 can be formed in a good state without causing damages, cracks, or other defects in the glass physics and chemistry equipment 1.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be described below with reference to the drawings. Reference numeral 1 shown in FIG. 1 is a reaction flask main body as a glass physics and chemistry equipment, and the reaction flask main body 1 is formed of glass having heat resistance and pressure resistance such as heat resistant glass. 2 is a coating layer, and the coating layer 2 is on the outer surface side of the reaction flask body 1 in an amount of about 40 to 6
It is provided with a uniform thickness of 0 μm.

The coating layer 2 is made of a fluororesin tetrafluoroethylene-hexafluoropropylene copolymer (hereinafter referred to as FEP resin),
The FEP resin has a high heat resistance temperature of about 200 ° C. and high heat resistance, and also has high chemical resistance to organic solvents, acids, alkalis and the like.

Next, the case of manufacturing such a reaction flask body 1 will be described. First, the coating layer 2 is formed on the outer surface of the reaction flask body 1 made of a normal heat resistant glass.

First, in order to prevent damage during heating and cooling during the step of forming the coating layer 2, the quality of the reaction flask body 1 is checked by a visual inspection for scratches or distortion.

Further, the outer surface of the reaction flask body 1 whose quality has been checked is washed with a cleaning agent such as an alkaline detergent. This cleaning is a process performed to prevent adhesion failure due to foreign matter or the like when a fluororesin coating material is applied, or appearance failure, and when cleaning the fluororesin onto a metal surface or the like, In addition, air baking is performed, but when a glass base material is used, it may be damaged during air baking, and therefore only cleaning is performed.

Further, since the fluororesin coating material has poor adhesion to the base material, when it is usually applied to a metal or the like, another coating material such as a primer may be applied to the surface of the base material in advance. In this case, it is important to maintain the transparency, so apply the fluororesin paint directly to the outer surface of the washed reaction flask body 1 without applying the paint that reduces the transparency. To do.

On the other hand, this fluororesin paint is
Use resin particles mixed in a solvent in a dispersed state. First, in order to make the concentration of this coating material uniform, rotate with a stirrer at a relatively low speed of 30 to 40 / rpm, and gently to avoid foaming. Adjust by stirring for about 30 minutes. At this time, if the stirring is continued for 30 minutes or more, the coating tends to foam, so that the stirring is preferably performed within 30 minutes.

Further, the agitated FEP resin coating material is passed through a sieve of stainless mesh 100 to 200 to make the resin particles uniform and adjusted to contain only finer FEP resin particles.

Next, the prepared FEP resin paint is applied to the reaction flask body 1. First, the prepared FEP resin paint is filled in a spray gun type paint container and uniformly sprayed and applied on the outer surface of the reaction flask body 1. At this time, if the air pressure of the spray gun is too strong, the coating film tends to become uneven, especially when it is applied to a smooth crow surface.
Set to a slightly low pressure of / cm ² . Further, a spray gun having a diameter of 0.8 mm at the time of application is used and is sprayed and applied on the outer surface of the reaction flask body 1.

Next, the reaction flask body 1 coated with this coating material is placed in an electric firing furnace preheated to a temperature of about 50 to 60 ° C., and then heated to about 100 ° C. To dry the paint for 20 to 30 minutes. This time,
If the temperature is suddenly increased, the glass reaction flask body 1 may be damaged, and it may cause unevenness or foaming of the paint, so it is necessary to gradually raise the temperature.

In this way, a fluororesin coating film is formed on the outer surface of the reaction flask body 1. Since the coating film at this time is an extremely thin coating film of about 15 to 20 μm, this coating step and The drying process is repeated several times to reach the desired thickness. In the case of this embodiment, a coating film having a thickness of about 40 to 60 μm is obtained by repeating the coating and drying steps 3 to 4 times.

The thin coating film thus formed is divided into a number of times, because the glass surface is smooth, it is difficult for the paint to adhere, and in order to maintain the transparency of the glass, it is made of metal. Since a rough surface treatment such as sand blasting cannot be applied to, the thin FEP resin coating film can be applied multiple times to ensure the coating of the paint while taking advantage of the characteristics of transparent glass. This is because.

The thickness of this coating is 40-60 as described above.
After being formed to a thickness of μm, the air gun having a diameter of 0.7 mm is replaced with an air gun having a small diameter to perform final coating.
By such final coating, the coating state of the coating can be adjusted.

Thereafter, as in the above-mentioned drying, 50 to 60 °
After putting in a firing furnace heated to a temperature of C, gradually raising the temperature and heating to about 330 to 340 ° C., then about 30 to
Bake for 40 minutes.

In this way, the coating layer 2 having a thickness of 40 to 60 μm is finally formed, and it is necessary to cool the coating layer 2 in order to surely fix the coating layer 2 on the glass surface.

Usually, when forming a fluororesin coating layer on a metal surface, the metal base material on which the coating film is formed is taken out from the firing furnace and forcibly cooled by a fan, water or the like. In order to form a coating film on the glass surface, the reaction flask 1 made of glass may not be able to withstand a sudden temperature change and may be damaged if it is rapidly cooled with water or a fan as in the case of metal, It needs to be cooled slowly.

As the cooling method, when the electric firing furnace as described above is used, after firing, the power of the firing furnace is turned off and the reaction flask body 1 is left in the firing furnace as it is, and the temperature is about room temperature. Cool down to the temperature of. By gradually cooling in this way, the reaction flask body 1
It is possible to securely fix the coating film on the surface without damage to the surface.

Since the coating layer 2 is provided on the outer surface of the reaction flask body 1 by the above-mentioned method, the fluororesin paint which has been difficult to apply to the glass surface by the conventional method is used for the outer surface of the glass of the reaction flask. Can be surely provided.

Further, the reaction flask provided with the coating layer 2 on the outer surface side is coated with the coating layer 2 on the outer surface side even if the reaction flask is overheated or cracked due to careless impact. The reaction flask body 1 does not scatter because it is coated with.

In particular, when the reaction flask body 1 is damaged by an erroneous work method when a chemical or the like is put in the inside for heating or the like, there is a possibility that not only the glass fragments but also the chemical may be splashed. However, when a reaction flask having the fluororesin coating layer 2 is used, such a situation can be reliably prevented.

Further, since the coating layer 2 is also excellent in chemical resistance, even when it is coated on a reaction flask such as a reaction flask using various chemicals, the coating is in good condition without being damaged by the chemicals. Can be maintained. In addition, since fluororesins such as FEP resins have high heat resistance, they do not deteriorate due to heating and pressurization due to normal use, unlike synthetic resin coatings such as vinyl chloride resins.

Further, since the reaction flask body 1 as a base material is not subjected to any surface treatment before applying the coating layer 2 as described above, it is possible to maintain the transparency peculiar to glass. It does not affect the function of the device. However, the physical and chemical equipment body 1 such as a flask
When the value is particularly large or the area of the curved surface is large, the adhesion of the coating layer 2 may be increased by performing a surface treatment that does not impair the transparency of the glass.

In the above embodiment, the coating layer was provided on the outer surface of the reaction flask as the base material. However, the physics and chemistry equipment used as the base material was a pressure bottle, a reaction container,
Any physicochemical equipment made of glass, such as a centrifugal settling tube, an ampoule, and a chromatographic column, can be used. In particular, if the centrifugal sedimentation tube is damaged during the centrifugal treatment, the chemicals may scatter. Therefore, when such a coating layer 2 is provided, the chemicals can be collected as long as the coating layer 2 is not damaged. Processing is simple and safe. Further, since the pressure bottle and the like are easily damaged when slight scratches or cracks occur, it is desirable to provide such a coating layer 2.

Further, in the above-mentioned embodiment, the coating layer made of FEP resin is formed as the fluororesin of the material of the coating layer 2. However, other fluororesin coating materials such as tetrafluoroethylene (PTFE) and trifluoride are used. The coating layer can be formed from any fluororesin such as ethylene chloride copolymer (PCTFE) and ethylene-4fluoroethylene copolymer (ETFE).

Further, in the above-mentioned embodiment, the total thickness of the coating layer is about 40 to 60 μm, but this thickness can be appropriately changed according to the substrate to be coated. It can be adjusted by the number of times the drying process is repeated.

Further, the fineness of the particles of the fluororesin particles contained in the fluororesin paint can be appropriately changed depending on the base material, and further, the diameter of the spray gun and the like can be appropriately selected according to the fineness of the paint. can do.

[0039]

INDUSTRIAL APPLICABILITY According to the present invention, the outer surface of glass-made physics and chemistry equipment such as pressure bottles, reaction vessels, centrifugal settling tubes, ampoules, and chromatographic columns is coated with a fluororesin, which has been difficult to coat with glass. Therefore, without impairing the properties of the glass, a high load such as pressurization and heating can be applied, and the safety of the physics and chemistry equipment that stores dangerous substances such as chemicals inside can be improved, and radioactive materials and It is possible to secure safety in fields such as experimentation, handling, and management of bio-related or high-priced medicines.

[Brief description of drawings]

FIG. 1 is a front view of a reaction flask which is an example of a glass physics and chemistry device of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part taken along the line AA of FIG.

[Explanation of symbols]

 1 Reaction flask body (physical and chemical equipment body) 2 Coating layer

Claims (5)

[Claims] 1. A glass-made physicochemical device characterized in that a coating layer (2) made of a fluororesin is provided on the outer surface of a physicochemical device body (1) made of glass. 2. The total thickness of the coating layer (2) is about 4
The glass-made physics and chemistry equipment according to claim 1, which is 0 to 60 µm. 3. A plurality of coating steps of applying a fluororesin coating to a thickness of about 15 to 20 μm on the outer surface of the glass-made physics and chemistry equipment body (1), and a drying step of drying the fluororesin coating after the application. The coating layer (2) having a desired thickness is repeatedly formed, and the physics and chemistry equipment body (1) having the coating layer (2) is placed in a firing furnace and gradually heated to be fired, and then A method for manufacturing a glass-made physics and chemistry equipment, which comprises gradually cooling in the firing furnace. 4. The fluororesin particles contained in the fluororesin paint are 100 to 200 mesh or less.
The method for manufacturing a glass-made physics and chemistry equipment according to. 5. The total thickness of the coating layer (2) is 40.
It is -60 micrometers, The manufacturing method of the glass-made physicochemical equipment of Claim 3 or Claim 4.