JPH04200746A - Non-combustible cook - Google Patents

Abstract

PURPOSE:To obtain high heat resistance and airtightness, in a non-combustible cock, for closing the opening part of an apparatus or processed glass material at the time of the heat processing of a high temp. experimental device or a glass instrument for chemical experiment, by bonding an inorg. fiber by water-swellable laminar clay mineral. CONSTITUTION:A cock-shape molded body 1 having an inverted truncated cone shape is formed by a method wherein an inorg. fiber, water-swellable laminar clay mineral (powder) and water are mixed to prepare paste having hardness almost same to that of clay, and this paste is put in a mold and pressed to be dried and solidified at room temp. or under heating. The inorg. fiber takes charge of the strength and deformation following properties due to entanglement, and the water-swellable laminar clay mineral is swollen in water to generate interlaminar release and dispersed in water as numberless minute plate crystals to show the thicknening action of water and, functions as the plasticizer of the paste and develops airtight action at the time of drying and is weakened in binder strength by moisture absorption. With respect to the ratio of components, the inorg. fiber is about 30-90wt.% and the clay mineral is about 10-70wt.% and the addition amount of water at the time of the preparation of the paste is pref. about 50-70%.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a novel nonflammable stopper with high heat resistance, and more specifically, a new non-combustible stopper with high heat resistance, which can be used in thermal processing of high-temperature experimental equipment or glassware for chemical experiments, etc. The present invention relates to a new nonflammable stopper suitable for use in closing openings in devices and glass materials.

Note that the use of the nonflammable stopper according to the present invention is not particularly limited (it can be widely applied to other uses other than those mentioned above).

[Conventional technology]

Conventionally, for example, in chemical experiments involving high temperatures or blowing processing of glassware for chemical experiments involving gas melting, it has often been necessary to close the opening S of the apparatus or glass material with a stopper.

A stopper used for the above purposes is required to have the following characteristics.

■Have heat resistance. Normally 500℃~1000℃
degree is required.

■It must be flexible enough to withstand slight deformation to fit into the opening.

■It must have excellent airtightness to block internal gas.

■It must be easy to drill and strong enough to securely hold a glass tube inserted into the hole.

By the way, silicone plugs, which have been well-established as heat-resistant plugs, have sufficient flexibility and airtightness, but their normal heat resistance is limited to about 250°C to 300°C. Therefore, silicone plugs have problems with heat resistance.

In addition, so-called molded plugs made by bonding inorganic fibers with an organic binder have sufficient heat resistance and flexibility, but are too porous and have the problem of not only being completely airtight but also having weak strength. ing.

Furthermore, in order to provide airtightness and strength to the molded plugs mentioned above, the molded body (plug) made by adding a considerable amount of aggregate and binder to inorganic fibers becomes too hard and the opening becomes difficult to form. There are problems in that it does not fit well and makes drilling difficult.

As described above, a plug made of a material that satisfies all of the above-mentioned conditions (1) to (2) is not known to date, and there is a long-awaited development of a plug that satisfies these conditions.

[Problem to be solved by the invention]

The present invention was invented in view of the above-mentioned points, and its purpose is to satisfy all the conditions (1) to (3) mentioned above, namely, heat resistance, flexibility, airtightness, and perforation. The purpose of the present invention is to provide a stopper that has the strength to withstand.

[Means to solve the problem]

In order to achieve the above object, the present invention employs inorganic fibers and water-swellable layered clay minerals as essential components of the material of the stopper.

That is, the nonflammable stopper according to the present invention is characterized by being formed by bonding inorganic fibers with a water-swellable layered clay mineral.

[For production]

The nonflammable stopper according to the present invention configured as described above exhibits the following effects.

(1) The material of the stopper is all inorganic and has high heat resistance (50%
0°C to 1200°C).

(2) Works to suppress heat conduction.

(3) It has appropriate strength and flexibility.

(4) Since a water-swellable layered clay mineral is used as the binder, it exhibits considerable airtightness (non-breathability) as a stopper (same level as that of a cork stopper).

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. Figure 1 shows a non-combustible stopper showing one embodiment of the present invention, and the stopper A of this embodiment is formed in the shape of an inverted truncated cone like a stopper such as a general-purpose cork stopper. The material of this plug-shaped molded body l is inorganic fibers and water-swellable layered clay minerals, and is made by kneading inorganic fibers, water-swellable layered clay minerals (powder), and water (tap water, etc.) to create a material with the same hardness as clay. This is made into a paste, put into a mold and molded under pressure, then taken out from the mold D, and solidified by drying at room temperature or by heating to form a T-piece.

As the inorganic fiber, for example, glass wool, slag wool, rock wool, silica alumina fiber, etc. can be used, but it is most preferable to use silica alumina fiber, which has excellent heat resistance.

Examples of such silica alumina fiber include SC bulk fiber 01260 manufactured by Nippon Steel Chemical Co., Ltd.
and Fineflex ■1300 bulk fiber manufactured by Nichias Corporation.

Potassium titanate whiskers, basic magnesium sulfate whiskers, gypsum whiskers, etc. may also be used.

The above-mentioned inorganic fibers have strength and deformability due to their entanglement.

Next, water-swellable layered clay minerals are minerals that swell in water, cause delamination between layers, and disperse countless microplate-shaped crystals in water, which thicken the water.For example, bentonite , hectorite/synthetic mica, smectite, etc., and can be appropriately selected and adopted from among these depending on cost, purpose of use, etc.

When these clay minerals are kneaded with water and inorganic fibers, their thickening action acts as a plasticizer for the paste and facilitates molding.

In addition, when dried for a certain period of time, it has a moderate strength, acts as a binder, and fills in the spaces between inorganic fibers, making it airtight (non-breathable).
demonstrate.

Furthermore, a noteworthy characteristic is that the binder strength is weakened due to moisture absorption, and this causes the molded product 1
shows flexibility. This point is the most important feature of the present invention.

In this case, when water glass, silica sol, alumina sol, aluminum phosphate, etc., which are generally known as inorganic binders, are used, there is no loosening due to moisture absorption, and the molded product becomes very hard, making it unsuitable as a stopper.

Furthermore, natural mica, talc, vermiculite, etc. can also be used for the purpose of increasing, modifying, etc.

Therefore, the ratio of each of the above components is 30 to 9 inorganic fibers.
Q wt%, clay mineral 10-7 Qwt%, preferably inorganic fiber 60-80 wt%, clay mineral 20-4 Q
It is wt%. However, the amount of water added when making this into a paste is preferably around 50 to 70% water content; if it is less than this, the paste will not spread well, and if it is too much, it will become too soft and difficult to mold. It lacks independence when removed, and shrinks and deforms during drying.

Next, Figure 2 shows the plug-shaped molded IK glass tube 2 in a tiled state. This stopper B has a through hole made of cork polar or the like in the center of the plug-like molded body 1 formed as described above, and a glass tube 2 is inserted into this hole. This stopper B is used when performing blowing processing, etc., as will be described later.

Next, regarding the nonflammable stopper of the above-mentioned example, one example of a specific manufacturing method thereof and test results of the manufactured product will be explained.

Production example 1 B) Paste production SC bulk fiber ■ 1260 to 709, Bengel R
(Bontonite made by Toyojun Yoko Co., Ltd.) Add 309% of water to this and 150% of water, knead with a meat chotsunoku to make a paste and make a tile.

(b) Molding and drying The T paste obtained in (a) above was put into a mold and compressed. After one mold, it was taken out from the mold D. The upper diameter was 37 fins, the lower diameter was 30 U,
To obtain a molded body with a height of 35m + 3S and an inverted truncated cone shape.

Next, this was dried at 120°C for 6 hours, and the upper diameter was 36,
A plug-shaped molded body 1 having a lower diameter of 29 mm, a height of 33 mm, and a weight of 17.5 El was obtained. This molded body 1 is a stopper A shown in FIG.

The stopper B shown in the second figure is obtained by punching a hole in the molded body 1 and inserting the glass tube 2 therethrough.

Production example 2 (a) Production of paste Fine Flex■ 1300 bulk fiber 60
Evening, Smekmate (manufactured by Co-op Chemical Co., Ltd., 5WN
) Y 25 g, 15.9 g of natural mica (manufactured by Yamaguchi Mica Kogyo Co., Ltd., A-31), 186 g of water was added to this, put in a mortar, and beaten while loosening well to make a paste.
child.

(b) Molding and drying The paste was placed in the same mold as in Production Example 1, pressure molded, taken out, dried at 100°C for 7 hours, and was made into a paste with a thickness of 37 mm, a lower diameter of 29 mm, a height of 34 mm, and a weight of 34 mm. A plug-shaped molded body 1 having a diameter of 14.4.9 was obtained.

The following table shows the results of testing the following items on the molded product 1 obtained in Production Examples 1 and 2 above.

- In the examples, the plug-shaped molded body is shown in the shape of an inverted truncated cone, but this shape and shape may vary depending on the opening of the intended device or instrument, or the intended use. It can be changed arbitrarily depending on the situation.

The nonflammable stopper of the embodiment has the above-mentioned structure, and one example of its usage will be explained next.

(1) Plug of high-temperature experiment equipment This is used in chemical experiments that involve high temperatures. Fig. 3 shows an example of an experiment using a test tube. That is, in the same figure, 3 is a test tube, a plug B with a glass tube 2 inserted into the opening of the tube 3 is fitted and sealed, and a thermocouple 4 is inserted into the test tube 3 through the glass tube 2 in an airtight manner. This is an example of use showing a state in which a gas generation experiment is being conducted while the test tube 3 is heated with a gas burner 5 and the internal temperature is sensed with a thermocouple.

(2) Plug for thermal processing of glassware for chemical experiments This is when used for blowing processing of glassware for chemical experiments that involves gas melting.
The process of attaching a branch (neck) to a 1-day flask and processing it into a 20-flask is shown, and the blowing process is performed as follows.

That is, the flask 6 shown in Figures 1 and 1-4 is formed with one mouth tube part 7, and this flask 6 has a neck (female joint) 8.
First, the gas pipe 2 is inserted into the opening 9 of the flask 60-neck pipe part 7, and the two caps B'? : At the same time, a stopper is fitted into the opening 10 of the neck 8 prepared separately to seal the nucleus. 2
While blowing air into the flask 6 through the T-tube 11 connected to the base end to reduce the internal pressure, a predetermined portion of the flask 6 (the portion where the branches are attached) is heated and melted with a gas burner 12. As a result, internal pressure is applied inside the flask 6, so the glass wall in the molten portion expands, and eventually the hole 13 opens (see Figure 5). Next, as shown in Fig. 6, the base end of the neck 80 fitted with the stopper A is placed in the position of the hole 13, and while blowing air into the flask 6 in the same manner as above, the area around the base of the neck 80 is heated with the burner 12. Heat and melt and attach the neck 8 to plus 6 VCm to form a 20 flask 6A'& as shown in the figure.In this way, the flask is sealed.

(3) Culture test tube plug This is used, for example, to seal the opening of a test tube in biotechnology culture, etc.
Use plug A for this. In such cases, if the stopper of the present invention is adopted, the stopper can be completely sterilized by heating with direct flame using a gas burner, and since the stopper of the present invention has a slight air permeability comparable to that of cork. , it is ideal as a stopper for this type of application.

Note that the above is an example of the use of the nonflammable stopper according to the present invention for roof tiles, and as already mentioned, it can be widely applied to other uses other than the above.

〔Effect of the invention〕

Since the present invention has the above-described configuration, it has the following effects.

(1) The components of the stopper are all inorganic materials, 500°C
It has high heat resistance of ~1200°C.

(2) Since it does not contain any organic matter, it does not produce smoke or bad odor during use (when heated).

(3) It is made by bonding inorganic fibers with a binder having an appropriate bonding force, and has both flexibility that can follow slight deformation and a considerable degree of airtightness.

(4) Can be easily perforated with cork polar etc.
It also has the strength to firmly hold glass tubes, etc.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing one embodiment of the nonflammable stopper according to the present invention, Figure 2 is a side view showing the state in which a glass tube is inserted, and Figures 3 to 7 are examples of the state of use. FIG. 1 Plug-shaped molded body 2 Glass tube patent applicant Kiriyama Seisakusho Co., Ltd. Procedural amendment sound (spontaneous) January 17, 1991 Case No. 1 Patent Application Hei 2-339229 No. 2, Name of the invention Nonflammable stopper 3, Relationship with the amended person's case Patent applicant address 2-31-11-4, Higashi Nippori, Arakawa-ku, Tokyo
, Agent 〒130 5. Subject of amendment (1) Full text of specification (2) Drawings 1.3) Document certifying authority of agency 6. Contents of amendment

Claims (1)

[Claims] 1. A nonflammable stopper characterized by bonding inorganic fibers with water-swellable layered clay minerals.