JPH07256663A - Automatic catalyst charging device for molding casting polyamide resin - Google Patents

Abstract

PURPOSE:To provide a device constituted so as to be capable of automatically charging a predetermined amt. of an anion polymerization catalyst in molten lactam. CONSTITUTION:An automatic catalyst charging device 10 for molding a polyamide resin is used at the time of the addition of a predetermined amt. of an anion polymerization catalyst to molten lactam and constituted of a replaceable cartridge 11 preliminarily housing the compressed matter 12 of the powder anion polymerization catalyst, the extrusion member 13 fitted in the cartridge 11 and moved to extrude the compressed matter 12 of the anion polymerization catalyst, a cutting means 14 cutting the compressed matter 12 of the anion polymerization catalyst extruded from the end part of the cartridge 11 and the protective case 15 connecting the end part of the cartridge 11 and having the cutting means 14 received therein.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic catalyst injection device for molding cast polyamide resin, and more specifically, it preliminarily compression-molds a powdery anionic polymerization catalyst whose humidity is strictly prohibited, and automatically cuts this compressed product. The present invention relates to an automatic catalyst injection device for casting cast polyamide resin that can be charged into a molten lactam storage tank.

[0002]

2. Description of the Related Art Conventionally, cast polyamide resins have excellent wear resistance, self-lubricating properties and mechanical strength, and are widely used as sliding members. Such a cast polyamide resin manufacturing method, the mold of the tubular body is heated in a hot air oven to a predetermined temperature, the mold is taken out of the furnace and the lactam polymerization liquid is injected into it, The mold is put in the hot air oven again and polymerized.

Specifically, a method of adding an anionic polymerization catalyst to a molten lactam and dissolving it, and then adding and mixing an anionic polymerization initiator during or after casting, or a molten lactam containing an anionic polymerization catalyst and anionic polymerization It was adjusted by a method of adding and mixing a molten lactam containing an initiator for use during casting. At this time, the operator put the anionic polymerization catalyst in a predetermined amount of cup and put it in the molten lactam storage tank every 2-3 minutes.

[0004]

The anionic polymerization catalyst used here includes sodium hydride, lithium hydride and the like. Of these, sodium hydride is commonly used. These anionic polymerization catalysts generate hydrogen gas by reacting with moisture in the atmosphere to generate heat or ignite when left in a place with high humidity, or react with molten lactam to generate hydrogen gas. It was extremely dangerous, such as catching fire. Moreover, in the past, the work of introducing the anionic polymerization catalyst into the molten lactam largely depended on the experience and skill of the worker, so it is a very dangerous process when the worker changes, and a safe working environment is strongly desired. Was there. The present invention solves such problems, and provides an automatic catalyst injection device for casting cast polyamide resin, which can automatically add a predetermined amount of anionic polymerization catalyst to a molten lactam. Especially.

[0005]

That is, the feature of the present invention resides in that an automatic catalyst feeding device for molding a polyamide resin used when adding a predetermined amount of anionic polymerization catalyst to a molten lactam is preliminarily powdered. A replaceable cartridge containing a compressed product of an anionic polymerization catalyst, an extruding member which is inserted into the cartridge and moves to push out a compressed product of the anionic polymerization catalyst, and an anionic polymerization catalyst extruded from the end of the cartridge. The automatic catalyst injection device for casting polyamide resin molding comprises a cutting means for cutting the compressed product and a protective case which connects the end of the cartridge and has the cutting means therein. Further, in the present invention, when the extruding member is composed of a piston member for pushing out the compressed product of the anionic polymerization catalyst in the cartridge and a moving means for reciprocating the piston member, or the cutting means is a cutter for cutting the compressed product of the anionic polymerization catalyst. Including the case where it consists of and cutter moving means.

[0006]

In the automatic catalyst injection device for casting cast polyamide resin of the present invention, the extrusion member is extruded by inserting the extruded member into a replaceable injection cartridge containing a compressed powder of anionic polymerization catalyst and moving it. The compressed anion polymerization catalyst is successively cut into a predetermined thickness by a cutting means and dropped into a molten lactam storage tank. As a result, a predetermined amount of anionic polymerization catalyst can be safely and automatically added to the molten lactam storage tank. Further, since the anionic polymerization catalyst used is a compressed product, the surface area is smaller than that of the powder, the reactivity is poor, and the risk is small. In particular, the amount of hydrogen gas generated immediately after the addition of the anionic polymerization catalyst can be suppressed to be smaller than that of the powder, and by extension, the peak value of the hydrogen gas concentration can be lowered.

[0007]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a schematic view of a casting polyamide resin polymerization apparatus using an automatic catalyst casting apparatus for casting polyamide resin according to the present invention, and FIG. 2 is a front view of an automatic casting apparatus for casting polyamide resin according to the present invention. FIG. 3, FIG. 3 is a view of FIG. 2 taken along arrow AA, and FIG. 4 is a view of FIG. 3 taken along arrow BB. The casting apparatus 1 for casting polyamide resin is divided into a storage tank 2 containing an anionic polymerization catalyst in a molten lactam and a storage tank 3 containing an anionic polymerization initiator in a molten lactam. The molten lactam that has flowed out is mixed and stirred in the mixing unit 4, and then poured into a mold 5 heated to 50 to 200 ° C. After that, the mold 5 has an ambient temperature of 100 to 210 ° C, preferably 130 to 180 ° C.
Place in a controlled oven to polymerize the lactam.

The storage tanks 2, 3 and the mixing section 4 are connected to each other by a pipe 7 equipped with a valve 6.
A pipe 8 for supplying nitrogen is provided in each of the storage tanks 2 and 3.
And a pipe 9 for discharging the same is provided to constantly maintain the pressure in the tank constant. Furthermore, the storage tank 2 is equipped with a catalyst automatic charging device 10 for an anionic polymerization catalyst.
A metering pump (not shown) can be installed below the valve 6 provided in each storage tank 2, 3.

The molten lactam is substantially anhydrous α-piperidone, ε-caprolactam, ω-laurolactam, or a mixture of two or more thereof. Industrially advantageous lactams include ε-caprolactam and ω-laurolactam. Is. The anionic polymerization catalyst used in the present invention is a known lactam polymerization catalyst such as sodium hydride, lithium hydride, metallic sodium and metallic potassium. Of these, sodium hydride is the best. On the other hand, examples of the anionic polymerization initiator include N-acetyl-ε-
Caprolactam, isocyanate, diisocyanate,
It is a urea derivative, urethane, or isocyanurate derivative.

The automatic catalyst feeding device 10 comprises a replaceable cartridge 11 into which a compressed substance 12 of an anionic polymerization catalyst has been charged in advance, and a compressed substance 12 of an anionic polymerization catalyst which has been inserted into the cartridge 11 and accommodated therein. It comprises an extruding member 13 for pushing out, a cutting means 14 for cutting the compressed product 12 of the anionic polymerization catalyst extruded from the cartridge 11, and a protective case 15 connecting the end of the cartridge 11 and having the cutting means 14 therein. ing.

The cartridge 11 has a thin portion 1 extending to the tip.
It is a cylindrical body such as a circular shape or a square shape having a long penetrating 7 and can be attached to and detached from the side wall 18 of the protective case 15 by the thin portion 17. That is, the cartridge 11 fitted in the pedestal 19 of the protective case 15 has the connecting member 2
The 0 is mechanically fixed to the pedestal 19 and the cartridge 11 with a screw or the like, and is fixed to the protective case 15. As shown in FIG. 5, the cartridge 11 is installed in a state in which it is inserted into the protrusion 25 of the lower mold 24 previously installed on the base 23, and after a predetermined amount of powdery anionic polymerization catalyst is put therein, Pressure is applied by the rod 26 of the cylinder, and this is repeated several times to produce the compressed product 12. The compressed product 12 of the anionic polymerization catalyst is about 9 in the accommodation volume of the cartridge 11.
Fill up to 0%. The cartridge 11 containing the compressed substance 12 of the anionic polymerization catalyst is mounted on the automatic catalyst feeding device 10.

The extruding member 13 has a function of extruding the compressed product 12 of the anionic polymerization catalyst which is fitted into the cartridge 11 and moved to be pushed, and the piston body 29 having the extruding portion 30 mounted at the tip thereof. And this piston body 29
The moving means 31 reciprocates. The piston body 29 is fitted into a rotary shaft 33 whose rear end is fixed on a support base 32, and is swung from a horizontal position to move the cartridge 11
To help with the replacement work. In the moving means 31, the pinion mounted on the rotary shaft of the prime mover 36 installed on the fixed plate 35 is meshed with the rack 39 fixed to the leg portion 38 of the support 32, and the piston body installed on the support 32 is mounted. 29 is reciprocated.

The cutting means 14 cuts the compressed product 12 of the anionic polymerization catalyst extruded from the end portion of the cartridge 11 into a predetermined thickness, and the cutter 41 is the rod 43 of the cylinder 42 which is the cutter moving means 45. , Which is moved up and down by the operation of the cylinder 42,
Cut 2. The cutter 41 is a linear member such as a wire that is connected to bridge the U-shaped frames 44 facing each other so as to bridge the anion polymerization catalyst 12 even if it comes into contact with the compressed product 12. is doing. Of course,
The cutter 41 may be a plate-shaped blade.

The protective case 15 is connected to the cartridge 11 and has the cutter 41 of the cutting means 14 therein and is connected to the ceiling surface of the storage tank 2. Reference numeral 46 in the figure denotes a nitrogen supply port, which constantly supplies nitrogen into the protective case 15. This protective case 15 is equipped with a steam heater jacket 47 on its half periphery for heating the inside, and is provided with a steam inlet 48 and a steam outlet 49.

Next, the operation of the catalyst automatic charging device 10 will be described. The cartridge 11 is previously installed in a state of standing on the lower mold 24, and after a predetermined amount of powdery anionic polymerization catalyst is put therein, it is pressurized by a cylinder,
This is repeated several times to produce the compressed product 12. The compressed product 12 of the anionic polymerization catalyst is filled up to about 90% of the accommodation volume of the cartridge. It is preferable for safety that the cartridge 11 is stored under a nitrogen atmosphere or immersed in oil.

After the piston body 29 of the push-out member 13 is retracted and swung from the horizontal position to the raised state, the cartridge 11 is removed, and a new cartridge 11 containing the above-mentioned compressed material 12 is mounted on the pedestal 19 of the protective case 15. It is fitted and fixed to the protective case 15 by the connecting member 20.
At this time, the nitrogen is constantly protected from the supply port 46 in the case 15
Supply inside.

The piston body 29 returned to the horizontal position is fitted into the cartridge 11 by the moving means 31 and further advanced to push out the compressed product 12 of the anionic polymerization catalyst by a predetermined amount. The forward movement of the piston body 29 is controlled by the proximity switch 50, and the backward movement thereof is controlled by the proximity switch 51. The extruded anionic polymerization catalyst compact 12 is
When the cutter 41 is moved downward by the operation of the cylinder 42, the cutter 41 is cut into a thickness of 10 to 20 mm and put into the storage tank 2 for the molten lactam. Compressed product 1
Even when 2 comes into contact with the molten lactam, the reaction rate is slow and the calorific value per unit time becomes smaller than that in the case of powder.
This is because the surface area is smaller than that of powder and the reactivity is poor.

When the compressed substance 12 of the anionic polymerization catalyst in the cartridge 11 is exhausted, the piston body 29 is retracted to the start position, is temporarily stopped by the operation of the switch 51, and then is swung from the horizontal position to the raised state. The cartridge 11 can be removed.

[0019]

Industrial Applicability As described above, in the automatic catalyst injection apparatus for molding cast polyamide resin of the present invention, the extruded member is inserted into the cartridge containing the compressed product of the anionic polymerization catalyst in advance to be extruded. The anion polymerization catalyst compressed product is sequentially cut into a predetermined thickness by a cutting means,
This is dropped into a molten lactam storage tank,
The anionic polymerization catalyst can be added automatically and safely without depending on the operator, and since the anionic polymerization catalyst used is a compressed product, the surface area is smaller than that of the powder, the reactivity is poor, and the risk is also small. Have an effect.

[Brief description of drawings]

FIG. 1 is a schematic view of a casting polyamide resin polymerization apparatus using an automatic catalyst feeding apparatus for casting a cast polyamide resin according to the present invention.

FIG. 2 is a front view of an automatic catalyst feeding device for molding a cast polyamide resin according to the present invention.

FIG. 3 is a view taken along the line AA in FIG.

FIG. 4 shows a view taken along the line BB of FIG.

FIG. 5 is an explanatory view showing a state in which a compressed product of an anionic polymerization catalyst is stored in a cartridge in advance.

[Explanation of symbols]

 10 Automatic catalyst feeding device 11 Cartridge 12 Compressed material 13 Extruding member 14 Cutting means 15 Protective case 29 Piston body 31 Moving means 35 Fixing plate 36 Motor 39 Rack 42 Cylinder 43 Rod

Claims (5)

[Claims] 1. A replaceable cartridge containing a compressed material of a powdery anionic polymerization catalyst in advance in an automatic catalyst loading device for molding a polyamide resin used when adding a predetermined amount of anionic polymerization catalyst to a molten lactam. An extruding member that fits into and moves into the cartridge to extrude a compressed product of the anionic polymerization catalyst, cutting means for cutting the compressed product of the anion polymerization catalyst extruded from the end of the cartridge, and the end of the cartridge. An automatic catalyst injection device for molding cast polyamide resin, characterized in that it comprises a protective case which is connected to and has an internal cutting means. 2. The automatic catalyst injection device for molding a cast polyamide resin according to claim 1, wherein the extruding member comprises a piston member for extruding a compressed product of the anionic polymerization catalyst in the cartridge and a moving means for reciprocating the piston member. 3. The automatic catalyst injection device for molding a cast polyamide resin according to claim 1, wherein the cutting means comprises a cutter for cutting a compressed product of the anionic polymerization catalyst and a cutter moving means. 4. The automatic catalyst feeding device for molding a cast polyamide resin according to claim 1, wherein the powdery anionic polymerization catalyst is sodium hydroxide. 5. A replaceable cartridge containing a compressed material of a powdery anionic polymerization catalyst in an automatic catalyst injection device for molding a polyamide resin used when adding a predetermined amount of anionic polymerization catalyst to a molten lactam. An extruding member including a piston member for pushing out a compressed product of an anionic polymerization catalyst in the cartridge and a moving unit that reciprocates the piston member; a cutting unit including a cutter for cutting the compressed product of the anionic polymerization catalyst and a cutter moving unit; An automatic catalyst injection device for molding a cast polyamide resin, characterized in that it comprises a protective case that connects the ends of the cartridge and has a cutting means therein.