JPS59193259A - Preparation of vacuum double container made of stainless steel - Google Patents

Abstract

PURPOSE:To obtain a thermos excellent in mechanical strength and heat insulating property, by a method wherein the outer wall surface of an inner container forming a space part is immersed in an alkali solution or an org. solvent to be degreased while the treated container is subjected to electrolytic degreasing and washed with a surfactant to form a silver mirror surface layer to the surface of said container. CONSTITUTION:A double wall structure is formed of an inner container and an outer container made of stainless steel and the space part formed between both containers is evacuated to form a magic pot made of stainless steel. After the outer wall surface of the inner container is immersed in an alkali solution or an org. solvent to be degreased, the degreased container is subjected to electrolytic degreasing. In addition, the outer wall surface thereof is washed with a surfactant and a silver mirror layer is subsequently formed to said outer wall surface by silver mirror reaction. Electrolytic degreasing is performed by using the outer wall surface of the inner container as an anode and, subsequently, it is used as a cathode to perform electrolytic degreasing.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a stainless steel stainless steel holder.

Traditionally, Galanu Minoya ware, which has a two-claw wall structure, was used as thermos flasks and other heat-insulating containers, but in recent years stainless steel 1 m
A vacuum double container using metallic materials has been proposed. Among these metal anti-slopes, stainless steel has the advantage of excellent corrosion resistance and strong mechanical strength, but like other metal anti-slopes, it is necessary to increase the height of the area between the walls formed between g and sotoya. When the sky is set, all the gas is released from the inside and the vacuum level drops to 4. In addition to the 18m title, it is also used to prevent the loss of silence due to random shooting, like the Nicho Valley Waterfall in the Galanu surface. Even if the silver sharp plating was completely formed, it was impossible to cause a silver mirror reaction.

In order to prevent M8 loss due to gas release 2 and radiation from inside this stainless steel to the true space, for example, in Japanese Patent Publication No. 57-22571, a vacuum double container space is formed. A structure in which a vitreous layer containing silicon dioxide as the main component was formed on the surface of the inner and outer metal bottles, and a silver mirror layer was logging on the glass resin, was disclosed in Japanese Unexamined Patent Publication No. 57-75.
In Meisho Book No. 621, a construction lotus was proposed in which nickel plating was applied to the surfaces of the inner and outer jars that formed the space, and a silver mirror was placed on top of the nickel plating. These vacuum double containers can obtain sufficient heat retention for practical purposes through the action of a glassy layer or a nickel plating layer and a silver mirror layer, and can maintain heat retention for a long period of time. The glassy layer interposed between the silver mirror layer and the silver mirror layer tends to be uneven, resulting in variations in product quality. Since the neck member and the bottom member must be plated and then joined together, the manufacturing process is complicated and requires a large number of man-hours.

The present invention aims to enable a silver mirror layer to be formed on the valley wall surface forming the vacuum space without forming a glassy layer or a nickel plating layer when removing a stainless steel vacuum double valley vessel. As a technical issue, is there a way to easily manufacture a stainless steel vacuum double container with excellent heat retention? ]: The purpose is to provide.

The gist of the present invention is to provide a stainless steel vacuum Niratani container, which has a double-walled structure consisting of an inner moss container and an outer container made of Nutenrenu steel, and which is made by vacuuming the space formed between the two containers. In the manufacturing method 2, at least the outer wall surface of the inner container among the wall surfaces forming the space is immersed in an organic solvent and then electrolytically degreased. □ Advantages and disadvantages of the present invention in a method for manufacturing a stainless steel vacuum double-valley device, characterized in that the wall surface is washed with a surfactant, and then a silver mirror 1 is formed on the outer wall surface by a silver base reaction. b) In the M embodiment, electrolytic degreasing is
The method includes a step of electrolytically degreasing using at least the outer wall surface of the inner container as an anode among the wall surfaces forming the space, and a step of electrolytically degreasing using it as a cathode. Furthermore, if necessary, a step of electrolytically degreasing using a PR current may be included before performing the step of electrolytically degreasing using the outer wall surface as a cathode.

This electrolytic degreasing is performed at a temperature of 15 to 95 °C and a voltage of 3 to 1
20 seconds or more under conditions of 2V and current density of 1 to 12A/Cn
It is held for 3 minutes. 2. As the electrolyte, an aqueous solution such as sodium hydroxide, sodium orthosilicate, sodium carbonate, or sodium phosphate may be used.
If necessary, small amounts of surfactants, sodium stearate, sodium palmitate, etc. may be added.

In another preferred embodiment, an anionic surfactant is used as the surfactant. Examples of the anionic surfactant include carbon atoms of 9 to 1, such as dodecyl sulfonate sorta and tetradecyl sulfonate sodium.
Sodium alkylbenzene sulfonate having 9 to 16 carbon atoms, such as n-octylbenzenesulfonate, sodium dodecylbenzenesulfonate, monoethyl succinate, monododecyl ether sodium sulfonate, and succinic acid. hydrophobic prime number of sodium dodecyl ester sulfonate, sodium succinate cyclo-1-methylbutyl enetersulfonate 10-20
amber dialkyl eneterusulfonic acid; N-
Amidonulfonates such as dodecanoyl-N-2 ethylhexylaminoethane sodium sulfonate with 12 or more carbon atoms
Higher fatty acid salts having 18 alkyl groups; First-class higher alcohol sulfate entel salts; Secondary amphoteric alcohol sulfate ester salts; Grade alkyl phosphate ester salts: Sulfuric ester salts of higher fatty acid esters; Sulfones of island-class fatty acid esters Contains acid maple lignin sulfonate; resin acid salt; fatty acid alcohol sulfate ester salt, etc. However, it is not limited to these.

In still another embodiment 2, the non-ionic yarn νt'-Lr is mixed with the anionic surfactant and
l' 7 divination 1 no qi 1j is 1 jyo month. This non-ionic yarn "/l'
Polyoxyethylene argylphenol having the alkyl formula of numbers 4 to 12; polyoxyethylene-polyoxypropylene-polyoxyethylene glycol, polyoxyethylene 9゜]]O-octatecanediol polyoxyethylene9. Examples include, but are not limited to, 10-dihydroxymethialoetril, boriogyzoethylene glycol oleate, and the like.

Commercially available surfactants may be used for both anionic and nonionic surfactants.

Oil-tight, just dilute 250 to 1,000 times.

Hereinafter, the present invention will be explained outside the prefecture with reference to drawings 7', which show examples of the present invention applied to thermoses made of gold-metallic steel.

In 13J, 1 is a stainless steel inner bottle, 2 is a stainless steel outer bottle, and the mouth part 3 of the bottle is reversely connected by soldering, welding, or other means to form a triple wall structure. Then, the space 4 formed between the inner bottle 1 and the outer bottle 2 is evacuated to a certain degree.

The inner bottle] has a body part 1a and a hollow part 11].
I formed by bonding by one stage of 4HfH
"L, outside jtli 2 is trunk 2a, bottom 21] and 7
M part 2 (4) is formed by joining.

A J-tube tube 5, which is used for evacuation when the space 4 is evacuated, is connected to the 1-degree part 2I) of the outer bottle 2 with a solder. A bottom cover 6 is attached to the part 21) by a bonding agent to protect the air groove 1).According to the present invention, in order to improve the air groove I force of the stainless steel vacuum picker, As shown in FIG. 2, a silver mirror layer 7 is formed on the wall surfaces of the inner and outer bottles forming the part 4, that is, the outer surface of the inner and outer bottles 1 and the inner surface of the outer bottle 2. In the example, the silver mirror layer 7 is formed on the outer surface of the inner bottle and the inner surface of the outer bottle, or the silver mirror layer 7 may be formed only on the outer surface of the inner bottle.

This is particularly advantageous in reducing costs in the case of containers with large contents.

According to the present invention, the silver mirror layer in the thermos having the above structure is formed as follows. In other words, the wall of the inner bottle forming the vacuum space 4 of the thermos bottle is soaked and degreased. (2) A pretreatment consisting of degreasing and degreasing is performed; after this, 1) washing with a 1[kikai m1 active agent] is performed, and then a silver mirror reaction is performed. This silver mirror reaction is 9ψmagazine 71,
It can be formed by a method similar to that used for manufacturing bottles. In other words, if the silver precipitation rate is increased, 1 "old 1.1
In order to deposit uniformly on the surface, the cleaned wall surface is activated by wetting it with an activating solution whose main component is stannous halide.
It is then formed by treatment with a silver mirror solution. In addition,
It is possible to omit the activation treatment, or it is desirable to shorten the silver mirror layer formation time.

Example] Steer V of 0.5 mm15, 7. Steel plate (SUS30
4) while manufacturing the inner bottle 1, use a stainless steel plate of 06 regular thickness (hereinafter referred to as the margin) to make the outer bottle 2 shoulder part + h2c, fit part] a2a - margin + (2
+) was manufactured, and the outer wall of inner bottle 1 +ni (i-infiltration 5) was fabricated.
-' -210 (manufactured by Nippon Kagakuki 44 Co., Ltd. □ Cleaning agent 1) 0 items 6) Using water bath sonication containing 509/l, 60-7
The sample was placed in a lid at 0° C. for 3 minutes at 79°C. Next, the total amount of water to be collected is 50 f//l, including 7*i' as positive, 20℃, and the dragon current lightning intensity is 2 A.
/ cyfr for 90 seconds, and further, Toughliquid ([]Fukagaku (trade name of cleaning agent made by Chizai Co., Ltd.) 509/l and hydroxide plastic/lium 509/l) were added.
Using the 7JLI'y〆l case containing the inner container as one pole, electrolyze it for 40 seconds at 20℃ and immerse it in a current of 7~10/J, then immerse it and remove it. Similarly, it was washed with hot water at 80°C and dried at 130 to 180°C. Inner layer 1 and outer bottle 2 treated in this way are 1 member 2C, all their eye parts 3 are
After graming a and Lll(4+21) k'l-i, they were temporarily set using an astringent tube to form a double-walled structure and joined to the plate member 21 of the outer bottle 2. A cleaning solution containing 400 times diluted surfactant containing lignin-nulphone-calcium as a main component is supplied from the chip tube 5 to the space 4.
The outer surface of the inner bottle was cleaned, the cleaning liquid was drained, and the inner bottle was washed with water.

Next, the entire tip tube 5 of the water bath solution containing 10 ppm of chloride wIJ is injected into the space 4 to activate the outer surface of the inner bottle 1, and after the aqueous solution is completely discharged, it is washed with water.

Next, a commonly used silver mirror solution, for example, a silver mirror solution prepared according to the following recipe, is placed in the space of the tip tube 5, and the double bottle is held horizontally in the axial direction, as in the case of the Galanu thermos flask. The solution is injected while rotating at high speed to precipitate a silver mirror, forming the silver mirror layer shown in FIG. After that, it is washed with water, dried, temporarily removed, a getter is installed inside the body member 2a of the outer bottle, and it is welded and joined to the shoulder member 2C of the outer bottle joined to the inner bottle 1, and the air is exhausted. Vacuum treatment was performed using a device similar to a conventional thermos flask, and the tip portion was melt-sealed.

(Prescription of silver mirror layer) Silver nitrate 109 was dissolved in a small amount of water, and to this was added 500% ammonia water and water to 4800%. t, and further 200 m of an aqueous solution containing 101 of sodium hydroxide/
In addition to this, the total amount was made 5000-, and this was designated as liquid A. Separately, 0.25 t of concentrated nitric acid was added to a water bath solution dissolved in 50 rnl of EWM20Yf<water and boiled, 5 d of 37% formaldehyde bath solution was added thereto, and then water was added to bring the total volume to 5000 rnl. - and call this liquid B. The above liquid A and liquid B are mixed at a volume ratio of 1:1 to obtain a silver mirror liquid.

A bottom cover 6 is attached to the bottom of the double-bottomed bottle thus obtained, and the content is reduced to 0. 7 5 l! Get a thermos flask. This one
In order to examine the heat retention ability of the Hahobin, measurements were made under the following conditions using the test method specified in JIS 2005.The heat retention effect for 24 hours was 638℃ at the maximum and 590℃ at the minimum, with an average of 61.
It was 0°C.

〔Test conditions〕

Pressure hot water vorticity = 95°C Hot water amount: Full stopper: Closed stopper (45 groups φ) Ambient temperature = 20°C Example 2 In Example 1 and 2, instead of the surfactant containing calcium lignosulfonate as the main component A stainless steel thermos flask was manufactured in the same manner as in Example 1 using Mama Lemon (Lion Co., Ltd. Alpha Olefin M (@ ion-containing higher alcohol yarn (anion), a surfactant for linear alkylbenzene yarn). When the heat retention ability of this thermos flask was examined, it showed the same performance as that of Example 1.

As is clear from the above description, according to the present invention, a silver mirror layer can be formed directly by electroless plating without any vitreous layer or nickel plating, and the heat retention is equivalent to that of conventional Galanu thermos flasks. An excellent effect can be obtained in that a stainless steel vacuum double container with high strength can be easily manufactured by using the manufacturing equipment for the Galanu vacuum double container.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a stainless steel thermos flask showing an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. 1. ■...Inner bottle, 2...Outer bottle, 4...Space,
5...Tip tube, 6...Bottom cover, 7...
・Silver mirror layer. Patent applicant: Zojirushi Mahobi Shishiki Co., Ltd.
People Patent Attorneys: Shin Ao and two others 1 Dark Figure 2 319-

Claims (5)

[Claims] (1) Manufacturing method KJ of a stainless steel vacuum double container, which has a double structure consisting of an inner moss container and an outer container made of stainless steel, and the space formed between the two containers is evacuated. Then, among the walls forming the space, at least the outer wall surface of the inner container is immersed in an alkaline solution or an organic solution (1) to degrease it, and then electrolytically degreased, and further, the outer wall VfJ is washed with a surfactant. and then completely forming a silver mirror layer on the outer wall surface by a silver mirror reaction. (2) The method according to claim 1, wherein the electrolytic degreasing described above is carried out by electrolyzing the inner container as an anode and then electrolyzing the inner container as a cathode. (3) The method according to claim 2, which comprises electrolyzing the electrolyte using a PR' current for 1J, using the inner container as a cathode. (4) The method according to any one of claims 1 to 3, wherein the mJ interface metaphysical agent is an anionic interface tej interface agent. (5) The method according to any one of claims 1 to 4, wherein the +1" barrier blood active agent comprises a nonionic surfactant.