JPH0712912Y2 - Sampling rod for viscous liquid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a viscous liquid sampling rod.

More specifically, it is a double-tube type sampling rod consisting of an outer tube and an inner tube or an inner rod, and when a high-viscosity solution or the like is sampled from the sampling port of the container, the sample liquid can be attached to the sampling port. The present invention relates to a viscous liquid sampling rod having no function.

(Prior Art) In laboratories of factories and factories, particularly in chemistry-related laboratories, various devices are used to conduct organic synthesis experiments and polymerize polymers.

As the needs of users have diversified as in recent years, the physical properties required for products have been finely demanded, and the opportunities for polymerization experiments and the like for making small sample samples have increased remarkably.

In order to support the performance required in this way,
Even when the same polymerization reaction is carried out, it is necessary to carefully check the reaction process, that is, the properties of the produced polymer for several hours to several tens of hours.

In a usual polymerization experiment or the like, it is general to check the progress of the reaction by sampling a small amount of the content at regular intervals during the reaction to measure the molecular weight (degree of polymerization).

In the polymerization experiment conducted in the laboratory as described above, 1 to
A glass flask having an internal capacity of about 10 liters and an autoclave when the reaction is at a high pressure are used.

For example, even in a glass flask, stirring is carried out to carry out the polymerization reaction under uniform conditions, and the temperature is measured, and usually, a reflux condenser and a sampling device for condensing an evaporated monomer and returning it to the inside of the flask. Generally, a three-or four-mouthed type is used so that a mouth or the like can be attached.

(Problems to be Solved by the Invention) The opening size of each mouth of the above-mentioned three-necked or four-necked flask, etc., varies depending on the volume of the flask, but is usually about 10 to 15 mmφ in inner diameter.

On the other hand, when performing sampling, a glass rod or glass tube having an outer diameter of about 5 mm is used, and in some cases, a stainless sampling spoon or the like is used.

The most general sampling pattern is to insert these sampling rods and the like from the sampling port attached to the flask as described above, and attach the contents near the tip of the sampling rod to take them out.

Thus, the polymer in the flask is taken out several times or more over time during the polymerization reaction, but the following problems occur.

That is, since the polymerization has not yet proceeded in the initial stage of the polymerization reaction, the molecular weight (polymerization degree) of the content is small, that is, the viscosity is low.

At this stage, there is not much problem.

The problem is that when the polymerization proceeds several hours after the initiation of the polymerization, the molecular weight (polymerization degree) of the content increases, and the viscosity inevitably increases.

The increase in the viscosity of the content is not only in the bulk polymerization using only the monomer and the polymerization catalyst, but also in the solution polymerization in which a solvent is interposed.

When the viscosity of the contents has risen in this way, the sampling rod is inserted from the sampling port in the same manner as above, and the contents are sampled. When the sampling rod is pulled out from the sampling port, it adheres to the tip of the sampling rod. Often, the content sample adheres to the inside of the sampling port.

This inconvenience occurs because a large amount of the sample adheres to the vicinity of the tip of the sampling rod due to the increase in the viscosity of the contents, and the sample does not drip in a short time, and the sampling rod is pulled out as it is.

Even in such a situation, it can be prevented if the experimenter pays close attention so that the sampling rod passes through the center of the sampling port, that is, the adhered sample is not brought into contact with the inner circumference of the sampling port.

However, since the sampling work needs to be done quickly, it is often attached.

As described above, if a part of the content adheres to the sampling port during sampling, it cannot be sealed as it is, and it is necessary to remove it and plug it.

This is because the attached polymer in the process of polymerization acts as an adhesive to fix the stopper and the sampling port, or the polymer in the process of adhesion even if not adhered is mixed in the contents. The stopper and sampling port are not sealed, and the monomer and solvent evaporate from the gap.

If the monomer or solvent evaporates and escapes, it is not only a safety problem but also the polymerization conditions change, which is not preferable.

In view of the above situation, the inventors of the present invention have made extensive studies, and have completed the present invention.

(Structure of the Invention) That is, the present invention is composed of an outer tube having both ends opened and one end expanded into an umbrella shape or a fishing rod shape, and an inner tube or an inner rod inserted into the outer tube. A structure having a protrusion on at least a part of the outer periphery of the outer pipe near the end of the inner pipe or inner rod on the side of the expanded outer pipe, the protrusion being a slide stopper for the outer pipe and the inner pipe or inner rod. The viscous liquid sampling rod is characterized in that the projection has an outer diameter capable of being housed inside the expanded portion of the outer tube.

The viscous liquid sampling rod according to the present invention will be described in detail below with reference to FIG. 1 showing an embodiment.

In FIG. 1, 1-1 is an outer pipe, 2-2 is one end thereof expanded, 3-3 is an inner pipe or inner rod, 4-4 is at least one end of the inner pipe or inner rod. Protrusions provided in the vicinity, 5-5 are protrusions provided near the other end of the inner pipe or inner rod as necessary, and these protrusions 4-4 and 5-5 are the outer pipe. It is a slide stopper to prevent the inner tube from falling off from 1-1.

The point of devising a viscous liquid sampling rod according to the present invention is to protect the sample liquid adhering to the end of the inner tube or inner rod from the expansion part at one end of the outer tube so as not to adhere to the sampling port. It is possible to prevent contact with each other, and as a variation of the tube expansion, a scraping part is provided at the tip of the tube expanding part to have a function of scraping off an extra sample.

In the viscous liquid sampling rod according to the present invention, the outer tube 1-
1 may be a glass tube or a metal such as stainless steel which does not rust.

In the case of plastic, those having chemical resistance such as polyethylene, polypropylene, and fluororesin are preferable.

The outer tube 1-1 has an outer diameter of 5 to 10 mmφ and an inner tube of 3 to 8 mm.
φ is preferred.

Expanding part 2-2 has a maximum outer diameter of 10 to 15 mmφ and an inner diameter of 8 to
13 mmφ is preferable, and its shape is preferably an umbrella shape, a bell shape, or a similar type thereof.

Needless to say, unless the maximum outer diameter portion of the expanded pipe portion is slightly smaller than the inner diameter of the sampling port, it is useless.

Next, the inner tube or the inner rod 3-3 inserted through the outer tube must be smaller than the minimum inner diameter of the outer tube.

Next, this inner tube or inner rod is provided with a projection on at least one end thereof, and is used as a stopper when it is slid with a stroke of 1 to 2 cm while being inserted into the outer tube 1-1. Play a role.

The protrusions provided at both ends of the inner tube or the inner rod 3-3 will prevent the inner tube or the inner rod and the outer tube from being dropped into the flask at the time of sampling, and will be stored at the time of washing. It is convenient because one of them does not disappear at times.

The projections provided on the ends of the inner pipe or the inner rod may be a plurality of horn-shaped projections or a flange-shaped bulge extending over the entire circumference.

Further, this projection may be a shape that does not allow the inserted inner rod or inner tube to fall out of the outer tube, such as the tip having a larger outer diameter than near the center, even if it is not a “so-called” projection.

The upper end of the inner rod or the inner pipe 3-3 does not need to be provided with a projection or have a thick outer diameter, and the inner rod or the inner pipe 3 is inserted through the inner rod or the inner pipe 3-3.
-3 and the outer tube 1-1 are prevented from falling off from each other, it is sufficient to bend them into an L-shape as shown in FIG.

In the viscous liquid sampling rod of the present invention, the stroke for sliding the outer pipe 1-1 and the inner pipe or the inner rod 3-3 is 1
~ 2 cm is enough.

Next, the shape variation of the expanded portion 2-2 at one end of the outer tube 1-1 will be described.

As described above, the expanded tube portion 2-2 spreads from the vicinity of the center toward the end portion in the shape of an umbrella or a bell, while the inner tube or the inner rod 3-2 has a shape in which the tip end portion has the maximum outer diameter.
The function of guarding the sample liquid attached to the tip of 3 is fulfilled.

However, if the tip of the expanded tube with this shape scrapes off the sample adhered to the tip of the inner pipe or the inner rod 3-3, the sample liquid adhered to the expanded tube 2-2 will be removed by scraping this time. It will stain the sample mouth.

In order to prevent this, as shown in FIG.
It is sufficient to make the tip of -2 a shape that is narrowed inward.

Next, the situation in which a viscous sample liquid such as a liquid in the middle of polymerization in a flask is taken out will be described in detail using the viscous liquid sampling rod according to the present invention.

First, the lower end of the inner tube or the inner rod 3-3, that is, the end on the side in contact with the viscous sample solution is slid so as to protrude to the outside of the expanded tube section 2-2 below the outer tube 1-1.

Normally, if the outer tube 1-1 is grasped by hand with the expanded portion 2-2 facing downward, the inner tube or the inner rod 3-3 will naturally slide by gravity to reach a desired state.

In this way, the lower end of the inner tube or the inner rod 3-3 is exposed to the outside of the tube expansion section 2-2 of the outer tube 1-1, and is inserted from the sampling port of the flask, It is immersed in the liquid during the polymerization of.

At this time, if the outer tube 1-1 is pushed too deeply, the expanded section 2-
It cannot serve its intended purpose as 2 contacts the liquid in the flask.

Conveniently, the glass flask is transparent and the inside can be observed. Therefore, if you work while observing the movement of the liquid level in the flask, you can bring the expanded tube section 2-2 of the outer tube 1-1 into contact with the liquid. Can be done without.

In this way, if only the tip portion of the inner tube or the inner rod 3-3, specifically about 1 cm of the tip portion is immersed in the liquid in the flask and lifted, the rounded sample liquid adheres to the tip portion.

Next, the outer tube 1-1 is slid downward, or the inner tube or inner rod 3-3 is slid upward, so that the sample attachment portion at the tip of the inner tube or inner rod 3-3 is expanded. −
Envelop inside 2.

If the size of the rounded sample is smaller than the opening diameter of the outermost end of the tube expanding section 2-2 of the outer tube 1-1, the sample adhering to the tube expanding section 2-2 is not scraped off by the tube expanding section 2-2. -2
It is possible to enclose it inside.

In such a state, the sample liquid will not adhere to the sample port even if the entire viscous liquid sampling rod composed of the outer tube and the inner tube is lifted up without special care.

[Brief description of drawings]

FIG. 1 is an external view of a viscous liquid sampling rod according to the present invention. 1-1 is an outer tube, 2-2 is an expanded tube portion, 3-3 is an inner rod or inner tube, and 4-4 is a protruding portion. is there. FIG. 2 is an external view showing another embodiment of the viscous liquid sampling rod according to the present invention.

Claims (1)

[Scope of utility model registration request] 1. An inner tube or an inner rod inserted into the outer tube, and an inner tube or rod inserted through the outer tube. At least a portion of the outer periphery of the outer rod-side end portion of the inner rod that is expanded is provided with a protrusion, and the protrusion has a structure that serves as a slide stopper between the outer pipe and the inner pipe or the inner rod, and The viscous liquid sampling rod, wherein the protrusion has an outer diameter that can be accommodated inside the expanded portion of the outer tube.