JPS6012510A - Diffusion treating device for synthetic resin object - Google Patents

Abstract

PURPOSE:To diffuse uniformly and continuously a monomer along the longitudinal direction of a synthetic resin object by constituting a gaseous monomer generating means provided separately from a diffusing means in such a way that a prescribed amt. of the gaseous monomer is generated stably with time thereby introducing the gaseous monomer by each specified amt. into the diffusing means. CONSTITUTION:A storage vessel 62 which can be maintained at a low temp. is provided separately from a storage vessel 67. The two vessels are connected to each other by conduits 64, 65 and the liquid monomer is circulated between the same to prevent the polymn. of the monomer in a storage vessel 60. The height of the liquid level of the monomer in the vessels 62, 67 can be maintained constant if the amt. of the monomer supplied from the top end 60a of the pipe 6 is so selected as to compensate the volume of monomer decreased by evaporation in the vessel 66. The amt. of the gas of the monomer generated in the vessel 67 can thus be maintained constant with time and therefore always a specified amt. of the gaseous monomer is supplied to the inside of a diffusing chamber 43 in the case of diffusing continuously the monomer into a transparent gel object 34.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides the method of applying the monomer to the synthetic resin object by bringing the monomer gas generated by the monomer gas generating means into contact with the synthetic resin object in the diffusion chamber of the diffusion means. The present invention relates to a diffusion treatment device for synthetic resin objects that is made to diffuse.

A transparent rod-like body whose refractive index distribution is given by the following equation (4) exhibits a convex lens action, and a light beam traveling through this transparent rod-like body meanderes along the central axis. The period is expressed by the following equation. Here n. is the refractive index on the central axis, n(r) is the refractive index at a point at a distance r from the central axis, and A is a positive constant (
0n(r)=no(1-(-A
r2) (A)L=2π/V″K) If the refractive index distribution is expressed by the following equation (0), it indicates a concave lens effect. Here, B is a positive constant (refractive index distribution constant) It is.

n(r)=n. (1++Br2) (0)Special Publications Showa 52-
5857-1=j Publication (hereinafter referred to as Patent Application 1), JP-A-51-16394 C (hereinafter referred to as Patent Application 2), Japanese Patent Publication No. 56-67521 (hereinafter referred to as Patent Application 6), and JP-A-56-67521 (hereinafter referred to as Patent Application 6). Publication No. 57-182702 (hereinafter referred to as %
In the patent application 4), a transparent gel body of a network polymer obtained by partially polymerizing a crosslinkable monomer Ma is added with a polymer having a refractive index different from the Bl refractive index of the network polymer. A synthetic resin whose refractive index changes continuously from the surface to the inside by polymerizing the monomer IVlb forming the transparent gel after being diffused from the surface of the transparent gel object in a liquid phase or gas phase or simultaneously with the diffusion. A method of manufacturing a light conduit is disclosed.

In the methods of Patent Applications 1 and 2 above, fj! A transparent gel object is immersed in a liquid monomer Mb, and the monomer Mb is brought into direct contact with the surface of the transparent gel object, but this method has the following drawbacks.

That is, since the polymerization initiator contained in the transparent gel body is eluted into the monomer Mb phase as the immersion time elapses, polymerization also occurs gradually in the monomer Mb phase.

When the immersion temperature is high, a layer of monomer Mb that has become viscous due to partial polymerization adheres to the outer peripheral surface of the transparent gel object taken out from the monomer Mb phase after immersion. Therefore, it is difficult to remove the monomeric Mb layer without damaging the transparent gel body. Therefore, during the subsequent heat treatment step performed for polymerization, the monomer Mb diffuses into the transparent gel body, which increases the undesirable distortion of the refractive index distribution near the outer periphery of the light transmitting body. Become. In addition, when the immersion temperature is low, the monomer 14 Mb diffused into the transparent gel object evaporates from the outer peripheral surface of the transparent gel object during the heat treatment process, and this increases the refractive index near the outer peripheral part of the original 1-pe transparent body. This causes an increase in undesirable distortion of the distribution.

In addition, in the method of the above-mentioned 1; Yokihan Application 6, the transparent gel object only comes into contact with the vapor of the monomer PvJb, so the above-mentioned drawback is eliminated, but as the vapor pressure of the monomer hib decreases, the light transmitting material becomes The disadvantage is that it is difficult to manufacture.

The following method has been proposed by the present inventors as a method for continuously manufacturing the synthetic resin optical transmission body. That is, as shown in FIG. 1, first, a viscous fluid (prepolymer fluid) obtained by pre-quaternizing the crosslinkable monomer Ma until just before gelation is introduced into an extruder (1). Next, the prepolymer fluid is fed from this extrusion tm (II) through the circular tube (2) into the Teflon tube (4) passing through the center of the forming tool (3). Since the prepolymer fluid has a temperature gradient that gradually increases from the bottom to the top, polymerization progresses gradually while the prepolymer fluid moves upward in the Teflon tube (4), resulting in molding. When exiting from the upper end of the tool (3), it becomes a transparent gel object (5). Next, this transparent gel object (5) is introduced into a diffusion tube (6), and in a diffusion chamber (7), the transparent gel object (5) becomes a transparent gel object (5). A monomer Mb forming a polymer having a refractive index different from that of (5) is diffused into the transparent gel object (5).Next, the transparent gel object (5) after the above diffusion is Heater (8) heats the knife to a predetermined temperature.
It is guided into the heated heat treatment tube (9). Polymerization of the transparent gel object (5) is completed while it is transported upward in the heat treatment tube (9), and the synthetic resin light whose refractive index continuously changes from the surface to the inside is emitted from the outlet 00). Transmitters (11) are obtained continuously. In addition, synthetic resin optical transmission body 0
The upward transfer of υ is carried out by the pulling motor a21 (+3) installed above the take-out port (10). (This is done by rotating 151.

The method of diffusing the monomer Mb into the transparent gel body in a gaseous state as described above has the following advantages.

That is, firstly, in the gas phase, the monomer Mb
can be diffused, so the monoclonal body odor is polymerized and fixed while diffusing inside the transparent gel object. Therefore, the monomer M diffused inside the transparent gel object
b is also prevented from evaporating from the outer peripheral surface of the transparent gel body during the subsequent heat treatment step carried out for polymerization. Therefore, the distortion of the refractive index distribution near the outer periphery of the obtained optical transmission body becomes small, and the range having the desired refractive index distribution can be extended to the vicinity of the outer periphery. Second, the monomer M
Not only does b contact the transparent gel body only in a gas phase state, but also there is no need to add a polymerization inhibitor if the feeding rate of the monomer Mb is adjusted, so the monomer Mb can be used repeatedly. , and the recovery rate of the monomer 1'vlb can be increased.

A diffusion tube (6) as shown in FIG. 2 (see FIG. 1) was proposed by the present inventors as a diffusion treatment device for diffusing monomer Mb in a gas phase inside a transparent gel object. There is. In this diffusion tube (6), the liquid monomer fvtbQal is stored in a storage chamber 7) which is heated to a predetermined temperature by energizing a heater (16) provided on its outer periphery. Note that this monomer Mb(18)G has an inlet port of 0.
9) into the storage chamber '0, and the surplus is discharged to the outside from the outlet.

The gas generation of monomer 1'Jb is caused by the monomer Mb (18
) by feeding nitrogen gas supplied from one end (21a) of the nozzle (21) into the monomer Mb (1
8) by vaporizing. The generated monomer Mb gas is guided into the diffusion chamber (2) as shown by arrow A, and the rod-shaped transparent gel object (5) is transported in the direction of arrow B inside the diffusion tube (6). By bringing the gas of the monomer Mb into contact with the surface, the monomer Mb is diffused into the interior of the transparent gel body (5).

Note that warm water (25) is flowed around the outer periphery of the diffusion tube (6), entering from the inlet (23) and exiting from the outlet (24), so as to maintain the diffusion chamber (22) at a predetermined temperature. It has become.

In addition, the diffusion chamber (2) is also designed to be exhausted from the outlet (26) by an external vacuum pump (not shown).Roughly below the diffusion tube (6) is a forming tool. (
3) is attached, and a transparent gel object (5) shaped like a rod is extruded from the upper end of a Teflon tube (4) that passes through the center of this molding tool (3). .

The above diffusion tube (6) has the following drawbacks. That is, first, while heating the monomer Mb (i8) stored in the storage chamber G7J, nitrogen gas is introduced into the monomer Mb (13 ) is vaporized, so if monomer Nib gas is heavier than nitrogen gas, it will diffuse! The concentration of the monomer Mb gas increases in the lower part of the tube (22), and as a result, the monomer Mb is deposited at the upper end of the Teflon tube (4). This deposited monomer Mb polymerizes over time, which causes a decrease in the roundness of the transparent gel object. Therefore, this adversely affects the axial symmetry of the refractive index distribution of the continuously manufactured synthetic resin optical transmission bodies. Second, when more monomeric Mb particles are deposited on the top end of the Teflon tube (4), the transparent gel object (5
), the monomer Mb diffuses not only from the monomer Mb in the gas phase but also from the monomer movement in the liquid phase.
With the passage of time, the particles of the monomer theory that diffuse inside the transparent gel object (5) become different. Therefore, it becomes difficult to fabricate a synthetic resin optical transmission body having uniform optical performance in a coupled manner. Third, since the location where monomer Nb is vaporized and the location where it is diffused are substantially the same, it is difficult to accurately measure the concentration of monomer Mb gas, and it is difficult to accurately determine the diffusion conditions. The object of the present invention is to provide a diffusion treatment apparatus for synthetic resin objects such as transparent gel objects, which eliminates the above-mentioned drawbacks.

That is, the apparatus for diffusion treatment of synthetic resin objects according to the present invention allows monomer gas generated by the monomer gas generating means to come into contact with the synthetic resin object in the diffusion chamber of the diffusion means, thereby applying the above-mentioned effects to the synthetic resin object. In a diffusion treatment apparatus for a synthetic resin object configured to diffuse a monomer, the monomer gas generation means and the diffusion means are configured to be separated from each other, and the monomer gas generation means is configured to diffuse a monomer. A first container capable of storing body fluid while maintaining it at a low temperature; a second container capable of storing a monomer fluid maintained at a high temperature; and between the first container and the second container. a circulation means for circulating the monomer liquid in the second container; and a non-occupied gas supply means for supplying an inert gas into the monomer paper in the second container to generate monomer gas. and introduction means for introducing the monomer gas generated in the second container of the monomer gas generation means into the diffusion chamber of the diffusion means. . By doing so, the monomer can be uniformly and continuously diffused into the synthetic resin object.

Hereinafter, the first diffusion treatment apparatus for synthetic resin objects according to the present invention will be described.
An embodiment applied to the synthetic resin optical transmission body manufacturing apparatus shown in the figure will be described with reference to the drawings.

As shown in FIG. 3, the diffusion processing apparatus C(1) consists of a diffusion tube (321) as a diffusion means and a monomer gas generator 03 as a monomer gas generation means. This diffusion processing device 0υ can be attached to the synthetic resin optical transmission body manufacturing device by attaching the diffusion tube (321) instead of the diffusion tube (6) shown in FIG. There is also a transparent gel object to be diffused (34)
The central axis of the diffusion tube (34) is transferred in the direction of arrow C, enters this diffusion tube 02 through the three lower end entrances (35), and enters the diffusion tube (three upper end exits). (3
G).

A molding tool (37) is attached to the lower part of the diffusion tube 03, and a Teflon tube (transparent gel object G34 shaped like a rod) passes through the center of the molding tool (37) from the upper end of the rod. It's like being pushed out. 1
The diffusion tube 021 has an outlet (deep end) at the bottom, and an exhaust pipe (40) attached to this outlet (39).
A vacuum pump (41) is provided at the other end. Note that a cold trap C is installed in the middle of the exhaust pipe (40). The diffusion chamber (43I is connected to the exhaust pipe (40) and the gap (41) by the vacuum pump (41).
4). In addition, the outer periphery of the diffusion chamber (41) enters from the entrance (45) and exits (41).
It is heated by hot water (47) coming out of the diffusion chamber (47), so that this diffusion chamber (47) can be maintained at a predetermined temperature.

In addition, the upper part of the diffusion tube (4gJ(
49) are attached to each. This 4 tube G18
A valve 60) is provided in the middle of the pipe (48), and with the valve 60) open, nitrogen gas is supplied from one end of the conduit (48) to the groove! (48) and can be introduced into the upper chamber 02 through the gap 6υ. By introducing nitrogen gas into the upper chamber (j) in this way, it is possible to prevent oxygen gas etc. from entering the diffusion chamber (4). (
6), and the monomer gas supplied from the monomer gas generator (33) connected to the other end of the conduit (49) with the valve (:j3) opened. , the conduit (
4! l), it can be introduced into the diffusion chamber (431) through the inlet 5a and the gap 6551.In addition, thermometers (7ω07) are attached to the upper and lower parts of the diffusion tube G3, and each part It is now possible to measure the temperature of

On the other hand, a supply W shaft for supplying the monomer to be diffused is attached to the upper part of the monomer gas generator (2), and is provided in the middle of this supply pipe (56). With the valve 6'/) open, monomer Mb can be supplied into the storage chamber from the supply port (56a) at the upper end of the supply pipe (56). A cooling pipe (5ω) is provided on the outer periphery of the storage chamber 681, and the cooling water flowing through the cooling pipe (5ω) cools the storage chamber (:)W by, for example, 10 (tll”). In addition, a pipe C)0) is attached to the bottom of the storage chamber (581), and when this pipe (valve 6 installed in the middle of 601) is opened, In this state, the monomer Wb in the storage chamber bat can be supplied from the tip (60a) of the pipe (60) into a storage container (62) serving as a first container. For example, 10 (
tr).

Furthermore, this storage container (6 old is a conduit (64J (65) (
The storage container (6η) is connected to the storage container (6η) as the second container.

A conduit (pump 8) is provided in the middle of 6!9, and this pump can be used to transfer, for example, the monomer liquid in the storage container (6η) into the storage container. .In addition, the storage container ←η is the heater ω provided on the outer periphery.
By energizing it, it can be heated to about 60 to 100C. In addition, when using polyfluoromethyl methacrylate (5FMA) as the monomer Mb, for example, the above-mentioned reservoir trough (6"θ is 70 to 80C)
Just heat it to . Furthermore, inside this storage container Oη, there is provided a bubble generator (7υ) as an inert gas supply means, the tip of which is located inside the monomer Mb (? ) is supplied from one end (73a) of a pipe (73) connected via a valve (721) to the monomer Mb ( 10).Furthermore, the monomer Mb gas generated in the storage container (67) is passed through the conduit (49) from the outlet C741.
), it is also supplied to the diffusion 11f (three diffusion chambers (431). Furthermore, a flow meter (75) is installed in the conduit (A9) adjacent to the storage container (C7). It is attached so that the flow rate of gas flowing through this isotube (49) can be measured.

Next, a method for diffusing monomer Mb into the rod-shaped transparent gel object 6a using the diffusion processing apparatus 01) configured as described above will be explained.

In FIG. 6, first, with the valve Q) 7) open, a predetermined amount of liquid monomer Mb is poured from the upper end (56a) of the supply pipe ←tiJ, and then the valve 5'I) is closed. At this time, the valve (61) is closed in the claw, and the injected monomer 'MI) liquid is stored! , d (stored in 5131. In this storage chamber U8J, the monomer Mb liquid is i 0
After cooling to about (C), open the valve Oυ and the tube (
The liquid of the monomer Mb is introduced into the storage container (rif) from the tip (60a) of the fifl).The liquid of the monomer Mb is gradually accumulated in this storage container (60 When the amount becomes the same as that of the conduit (goods), the monomer Mb liquid starts to flow into this conduit (passing through the 6 slopes and storage container 6'7), and after a while, the monomer Mb liquid starts to flow into the conduit (through the 6 slopes and the storage container 6'7). The liquid level of the liquid Mb becomes almost the same.At this point, close the valve slightly and the liquid of monomer 1'Vb drips little by little from the tip (60a) of !(60). state.

Note that the storage container (6η is kept at about 80 (C) and 38 degrees C) in advance.

Next, by starting the pump (6a1), the liquid of monomer 1vib in the storage container (6゛θ) begins to be transferred into the storage container (b2) through the conduit (65). At the time when the single body Mb in the storage container (67)
As the liquid level of the liquid of the elderly body Mb in the storage container Toa becomes lower, the height of the ridged surface of the liquid of the elderly body Mb in the storage container Toa becomes lower. is lead W (64
) and flows into the storage container (6'/) again,
There is not much difference in the liquid level of the monomers p, , b in the storage container &i2i (i'θ). While the liquid Mb is being dripped, open the storage container (a unit in the 1φ
The liquids of monomers M and b can be circulated between these storage containers (621 (67)) while keeping the liquid level of the liquid of monomers Mb almost the same. (6
7) are connected to each other by the conduit (66), the spaces (62a) and (6) which are not filled with the monomer Mb liquid in these storage containers (62) and (67) are
Due to the pressure difference between the storage vessels (62) and (6
7) This prevents a difference in the liquid level of the monomer Mb liquid. By circulating the monomer & ibO liquid between 0 sets of storage containers 6'7), 80
(This prevents the monomer Mb liquid from polymerizing in the storage container (6η) maintained at a temperature of 14 degrees C. The base of the mass Mb is selected to compensate for the monophyletic theory that is consumed by vaporization in the storage container (67), but this is actually done as follows.
If the diameter of the tube (60a) is appropriately selected, the liquid level of the monomer Mb liquid in the storage container (621) will be lowered and the tip (60a) of the tube will be lowered.
), when the tube is about to separate from this tip (60a)
Since air enters the storage container 02 from the pipe (60)
) is automatically supplied with a monomer Mb solution.

Next, when the level and temperature of the monomer Nb liquid in the storage container (J2) (67) have stabilized, open the valve (74) and open the pipe (7:1) from one end (73a) of the monomer Nb liquid. Nitrogen gas is extracted from the bubble generator σD to monomer M.
b (70). As a result, the monomer Mb is vaporized, and the storage container (6'D) is filled with a gas mixture of monomer ML+ and nitrogen. (through 491 towards the diffusion tube country, and is supplied into the diffusion chamber (1~) through the inlet 5 and gap t55. In this way, the diffusion chamber (4
The mixed gas supplied into the diffusion chamber (4 side walls (4
The liquid flows downward in the space (43b) between the transparent gel body 04) and the transparent gel body 04), and is exhausted by the vacuum pump (41) through the gap (4), the outlet (39J), and the exhaust pipe (40). While the mixed gas flows downward in the space (43b), the monomer Mb gas contained in the mixed gas is transferred to the transparent gel object (34) that is being transferred in the direction of arrow C. By contacting the surface, monomeric Mb diffuses into the interior of this transparent gel body 04).

The diffusion chamber (431) is maintained by hot water (47) at a temperature comparable to or higher than the heating temperature of the storage container (67). When used, the temperature should be around 80C.Also, during diffusion, nitrogen gas is supplied from one end (48a) of the conduit (48) as described above.
Nitrogen gas is introduced into the upper chamber 6 through ports 1 and ++, and the flow rate of this nitrogen gas is maintained at about 10 times the flow rate of the mixed gas flowing through the dedicated pipe (49).

In the above-mentioned embodiment, single-body gas is generated! (33)
The monomer gas generator and diffusion tube (321) are separated from each other, and the monomer gas generator and diffusion tube (321) are connected to each other by exclusive use.Therefore, the bubble generator (7
After adjusting the concentration of monomer Mb gas generated in this storage container (υη) to a predetermined concentration by appropriately selecting the current current and temperature of the storage container (6η) for the nitrogen gas supplied to υ, Monomer Mb gas can be sent to the diffusion tube (321).

For this reason, in the diffusion chamber (4~), monomer M at a predetermined concentration is
Diffusion can be carried out in the transparent gel body C)4) under the gas atmosphere of b. In addition to the storage container η, a storage container (c) that can be maintained at a low temperature is provided, and these storage containers (
63f671 are connected to each other by conduit f64) and f651, and a pump (58) is provided in the middle of the conduit to circulate the monomer Mb liquid in these storage containers (62) and (67). As mentioned above, it is possible to prevent the polymerization of the monomer Mb in the storage container (67), and also to reduce the amount of monomer Mb supplied from the tip (60a) of the container (66I). If the monomer Mb is selected to compensate for the monomer Mb that is consumed by vaporization in the tank, the height of the monomer Mb liquid in the storage container (6) η can be kept constant. Therefore, since the violet of monomer Mb gas generated within η of the storage container can be kept constant over time, when monomer Mb is continuously diffused into the transparent gel body (f14), Also, a constant amount of monomer Mb gas can always be supplied into the diffusion chamber (431), and as a result, uniform diffusion can be performed along the length direction of the transparent gel body G34. Therefore, it is possible to continuously manufacture a synthetic resin optical transmission body having uniform optical performance along the length direction.

In addition, since the inside of the diffusion tube O is evacuated by a vacuum pump (41), the Teflon tube C38
) Monomer Mb will not be deposited on the upper end of the film. Therefore, as described above, the circularity of the transparent gel object (34) does not deteriorate, and the diffusion becomes non-uniform along the length of the transparent gel object 4 ((a)).

Furthermore, of the monomer Mb gas introduced into the diffusion tube G3, the portion that was not used for diffusion into the transparent gel object c34) is pumped outside the diffusion tube (3) using a vacuum pump (41). Since the trapped monomer Mb is trapped by the cold trap action while being
By recovering the monomer Mb, the monomer Mb can be used repeatedly.

The present invention is not limited to the above-mentioned embodiments, but is based on the technical idea of the present invention (various modifications are possible. For example, in the above-mentioned embodiments, a storage container (with a capacity of are the same, but the volume of the storage container (G2) is
Even if the volume is larger than that of the storage container (6
The number of conduits connecting 3(6η) to each other may also be 6' or more.Furthermore, in the above embodiment, the pump (
47), the monomer haze liquid is transferred from the storage container 4 to the storage container 4, but it may be transferred in the opposite direction if necessary. Further, the gas generated from the bubble generator συ does not have to be nitrogen gas, but may be other inert gas such as argon or helium. In the above-mentioned embodiment, the case where the monomer Mb is diffused into a transparent gel object was explained, but the synthetic resin object diffusion treatment apparatus according to the present invention can also be used for other synthetic resin objects. it is obvious.

As described above, according to the diffusion treatment apparatus for synthetic resin objects according to the present invention, a predetermined amount of monomer gas is stabilized over time in the monomer gas generation means provided separately from the diffusion means. The generated monomer gas can be introduced into the diffusion stage at a constant rate of 1:1 through the introduction means, so that the monomer can be uniformly and continuously along the length of the synthetic resin object. ◇

[Brief explanation of the drawing]

Figure 1 shows the diffusion treatment of synthetic resin objects according to the present invention - 4MH
Do Hong・Used・Synthesis・Rei(−fat−−integral y−diffusion−
Synthesis using processing equipment (a cross-sectional view of the manufacturing equipment for the sealing source transmission body, Figure 2 is a cross-sectional view of a conventional diffusion treatment bag, Figure 6 is a synthesis according to the present invention) A σ (This is a top view of the adipose proboscis diffusion treatment device. In addition, in the symbols used in the drawing, t5x341......Transparent gel object (
6)・・・・・・・・・・・・Diffusion tube (71(2)
;4) (4ri... Diffusion chamber (I foot...
・・・・・・・・・Monomer Mb(11)・・・・・・
...... Diffusion processing device (114...
・・・・・・・・・Column tube (diffusion means)・・・・・・・・・
・・・・・・・・・J11 version gas generating candy (monomer waste generating means) ・・・・・・・・・・・・・・・ Conduit (hijin means) 4...・・・・・・・・・・・・Storage container (
1st valley ki) (64 buttons ・・・・・・・・・・・・
4 tubes (6-0......Storage container (second container) (684......
- Pump (71) --- Bubble generator (inert gas supply means). Agent Souvenir Masaru〃 Yoshio Tsunekako〃 Toshiki Sugiura

Claims (1)

[Claims] 1. The monomer gas generated by the monomer gas generating means is brought into contact with the synthetic resin object in a diffusion chamber of the diffusion means to diffuse the monomer into the synthetic resin object. In the diffusion treatment apparatus for synthetic resin objects, the monomer gas generating means and the diffusion means are configured to be separated from each other, and the monomer gas generating means maintains the monomer liquid at a low temperature. A first container capable of storing the monomer liquid at a high temperature, a second container capable of storing the monomer liquid while maintaining it at a high temperature, and a monomer liquid stored between the first container and the second container. and an inert gas supply means for supplying an inert gas into the monomer liquid in the second container to generate monomer gas, A diffusion treatment device for a synthetic resin object, characterized in that an introduction means is provided for introducing the monomer gas generated in the second container of the body gas generation means into the diffusion chamber of the diffusion means. . 2. The apparatus for diffusion treatment of synthetic resin objects according to claim 1, wherein the volume of the first container is not smaller than the volume of the second container.