JP2021030657A - Cast nylon molding method and cast nylon molding apparatus - Google Patents

Abstract

To provide a cast nylon molding method and a cast nylon molding apparatus that contribute to reducing the generation of empty containers.SOLUTION: In the cast nylon molding method, the common raw material is supplied from a common raw material tank 1 to each of an A raw material tank 8 and a B raw material tank 10, the catalyst is supplied from a catalyst tank 4 to the A raw material tank 8, the initiator is supplied from an initiator tank 6 to the B raw material tank 10, the common raw material and the catalyst in the A raw material tank 8 are mixed to form A raw material, and the common raw material and the initiator in the B raw material tank 10 are mixed to form B raw material. The A raw material in the A raw material tank 8 and the B raw material in the B raw material tank 10 are fed to a mixing agitator 12, the A raw material and the B raw material in the mixing agitator 12 are mixed to form molding material, and the molding material is poured into a molding mold 13. The cast nylon molding apparatus is equipped with the common raw material tank 1, common raw material first supply means 2, common raw material second supply means 3, the catalyst tank 4, catalyst supply means 5, the initiator tank 6 and initiator supply means 7.SELECTED DRAWING: Figure 1

Description

The present invention relates to a casting nylon molding method and a casting nylon molding apparatus used for manufacturing a nylon molded product.

Conventionally, as a casting nylon molding device used for manufacturing nylon molded products, it is supplied from two raw material tanks, a measuring means (measuring pump) that sucks and measures raw materials in each raw material tank, and those measuring means. A mixing stirrer for mixing and stirring raw materials and a molding mold for pouring the raw materials in the mixing and stirring machine are known (Patent Document 1).

In the casting nylon molding apparatus, the A raw material in one raw material tank and the B raw material in the other raw material tank were weighed by their respective measuring pumps, and both raw materials were mixed and stirred in a mixing stirrer and mixed and stirred. A nylon molded product is molded by pouring the raw material into a molding mold.

Ε-caprolactam, which is the main component of raw materials A and B used in the production of nylon molded products, and catalysts and initiators added to the ε-caprolactam may be affected by moisture and oxygen in the air. is there. Polymerization activity decreases or disappears under the influence of water and oxygen. If the polymerization activity of the catalyst is reduced or eliminated, it becomes difficult to obtain a good nylon molded product.

Under these circumstances, Nikko Giken Co., Ltd., one of the applicants of this case, has put the raw material used in the casting nylon molding device into a container having a gas barrier property that can prevent moisture and oxygen in the air from entering. We have developed a molded material in a container that is housed and sealed in a container, and obtained a patent (Patent Document 2).

Japanese Unexamined Patent Publication No. 2016-165802 Japanese Patent No. 6338753

The container-filled molding material of Patent Document 2 is useful for business establishments that produce a required amount of raw materials each time molding, specifically, business establishments that carry out high-mix low-volume production. However, in a business establishment that uses hundreds or thousands of molding materials in a container at a time, a large amount of empty containers are generated, and the processing thereof becomes a problem.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a casting nylon molding method and a casting nylon molding apparatus that contribute to suppressing a large amount of empty containers.

[Casting nylon molding method]
The cast nylon molding method of the present invention is a method of molding a nylon molded product by pouring a molding material obtained by mixing and stirring A raw material and B raw material into a molding mold, and stores a common raw material common to A raw material and B raw material. A predetermined amount of common raw material is supplied to each of the A raw material tank and the B raw material tank from the common raw material tank, and a predetermined amount of catalyst is supplied from the catalyst tank for storing the catalyst to the A raw material tank, and the starting agent is stored. A predetermined amount of the initiator is supplied from the agent tank to the B raw material tank, the common raw material and the catalyst supplied to the A raw material tank are mixed and stirred to obtain the A raw material, and the common raw material and the initiator supplied to the B raw material tank are mixed. Stir to obtain B raw material, supply A raw material in A raw material tank and B raw material in B raw material tank to a mixing stirrer, and mix and stir the A raw material and B raw material supplied to the mixing stirrer to obtain a molding material. , This is a method of molding a nylon molded product by pouring a molding material in a mixing stirrer into a molding mold.

[Casting nylon molding equipment]
The casting nylon molding apparatus of the present invention includes an A raw material tank for storing A raw material, a B raw material tank for storing B raw material, a mixing stirrer for mixing and stirring A raw material and B raw material, and mixing and stirring in the mixing stirrer. It is equipped with a molding mold for pouring the molded material, and supplies a predetermined amount of common raw material from the common raw material tank to the A raw material tank and a common raw material tank for storing the common raw material common to the A raw material and the B raw material. A common raw material first supply means, a common raw material second supply means for supplying a predetermined amount of common raw material from the common raw material tank to the B raw material tank, a catalyst tank for storing the catalyst, and a predetermined amount of catalyst from the catalyst tank as the A raw material. It is provided with a catalyst supply means for supplying the tank, an initiator tank for storing the initiator, and an initiator supply means for supplying a predetermined amount of the initiator from the initiator tank to the B raw material tank.

Since the casting nylon molding method and the casting nylon molding apparatus of the present invention generate the A raw material and the B raw material in the apparatus, an empty container such as a containerized molding material does not occur, and the empty container can be processed. No problem occurs.

The schematic explanatory view which shows an example of the casting nylon molding apparatus of this invention.

(Embodiment)
An example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic explanatory view of the casting nylon molding apparatus of the present invention. In FIG. 1, 1 is a common raw material tank, 2 is a common raw material first supply means, 3 is a common raw material second supply means, 4 is a catalyst tank, 5 is a catalyst supply means, 6 is an initiator tank, and 7 is an initiator supply. Means, 8 is an A raw material tank, 9 is an A raw material supply means, 10 is a B raw material tank, 11 is a B raw material supply means, 12 is a mixing stirrer, and 13 is a molding mold.

For convenience, in FIG. 1, the common raw material first supply means 2 and the common raw material second supply means 3 are shown separately to the left and right, the catalyst supply means 5 and the initiator supply means 7 are shown to be separated to the left and right, and the A raw material supply means 9 is shown. And B raw material supply means 11 are shown separately to the left and right, but the common raw material first supply means 2 and the common raw material second supply means 3 are shown, the catalyst supply means 5 and the initiator supply means 7 are shown, and the A raw material supply means 9 is shown. And B raw material supply means 11 are arranged side by side.

The common raw material tank 1 is connected to the common raw material first supply means 2 via the A raw material first liquid feed pipe 14a, and the common raw material first supply means 2 is connected to the common raw material first supply means 2 via the A raw material second liquid feed pipe 15a. It is connected to 8. A predetermined amount of the common raw material in the common raw material tank 1 is measured by the common raw material first supply means 2, and the predetermined amount of the common raw material is supplied to the A raw material tank 8.

Similarly, the common raw material tank 1 is connected to the common raw material second supply means 3 via the B raw material first liquid feed pipe 14b, and the common raw material second supply means 3 is connected to the common raw material second supply means 3 via the B raw material second liquid feed pipe 15b. Is connected to the B raw material tank 10. A predetermined amount of the common raw material in the common raw material tank 1 is measured by the common raw material second supply means 3, and the predetermined amount of the common raw material is supplied to the B raw material tank 10.

The catalyst tank 4 is connected to the catalyst supply means 5 via the catalyst first liquid feed pipe 16a, and the catalyst supply means 5 is connected to the A raw material tank 8 via the catalyst second liquid feed pipe 17a. A predetermined amount of the catalyst in the catalyst tank 4 is measured by the catalyst supply means 5, and the predetermined amount of the catalyst is supplied to the A raw material tank 8.

Similarly, the initiator tank 6 is connected to the initiator supply means 7 via the initiator first liquid feed pipe 16b, and the initiator supply means 7 is connected to the initiator tank 10 via the initiator second liquid feed pipe 17b. Is connected to. A predetermined amount of the initiator in the initiator tank 6 is weighed by the initiator supply means 7, and the predetermined amount of the initiator is supplied to the B raw material tank 10.

The A raw material tank 8 is connected to the A raw material supply means 9 via the A raw material first liquid feed pipe 18a, and the A raw material supply means 9 is connected to the mixing stirrer 12 via the A raw material second liquid feed pipe 19a. ing. A predetermined amount of the A raw material in the A raw material tank 8 is weighed by the A raw material supply means 9, and the predetermined amount of the A raw material is supplied to the mixing stirrer 12.

Similarly, the B raw material tank 10 is connected to the B raw material supply means 11 via the B raw material first liquid feed pipe 18b, and the B raw material supply means 11 is connected to the mixing stirrer 12 via the B raw material second liquid feed pipe 19b. Is connected to. A predetermined amount of the B raw material in the B raw material tank 10 is weighed by the B raw material supply means 11, and the predetermined amount of the B raw material is supplied to the mixing stirrer 12.

As an example, the common raw material tank 1 shown in FIG. 1 is a container for storing a common raw material common to the A raw material and the B raw material. The common raw material referred to here is substantially anhydrous ε-caprolactam. Substantially anhydrous ε-caprolactam can be obtained by depressurizing ε-caprolactam in a solid state or a molten state with a vacuum pump or the like to remove water contained in ε-caprolactam.

In this embodiment, a heater H is mounted on the outer periphery of the common raw material tank 1 so that the common raw material inside can be maintained at a predetermined temperature. A jacket-equipped common raw material tank 1 can also be used. In this case, the temperature of the common raw material tank 1 is raised by a heat medium, steam, or the like. In either case, it is preferable to maintain the temperature control in the temperature range of 80 to 140 ° C. The common raw material tank 1 is provided with a stirring blade 20 driven by a motor M so that the common raw material in the common raw material tank 1 is stirred.

In this embodiment, in order to prevent adverse effects due to moisture and oxygen in the outside world (in the air), the inside of the common raw material tank 1 is maintained in an atmosphere of an inert gas such as nitrogen gas regardless of whether or not the common raw material is stored. It is designed to be done.

The common raw material first supply means 2 measures the common raw materials to be supplied from the common raw material tank 1 to the A raw material tank 8, and the common raw material second supply means 3 supplies the common raw materials from the common raw material tank 1 to the B raw material tank 10. It measures common raw materials.

An existing or new measuring pump can be used for the common raw material first supply means 2 and the common raw material second supply means 3. As the existing measuring pump, for example, a measuring pump in a resin molding apparatus (Patent No. 6543648) previously developed and patented by Nikko Giken Co., Ltd., one of the applicants of the present application, can be used. Existing or new valves can also be used for the common raw material first supply means 2 and the common raw material second supply means 3.

The catalyst tank 4 is a container for storing the catalyst. As the catalyst tank 4, the same one as the common raw material tank 1 can be used.

Examples of the catalyst include alkali metals such as sodium and potassium, alkali metal derivatives such as sodium hydride and sodium alcoholate, alkaline earth metals and alkaline earth metal derivatives, alkali metal derivatives and alkaline earth metal derivatives, and ε-. A known ω-lactam catalyst such as a reaction product with caprolactam can be used. As an example, Addonyl® Kat NL of LANXESS Co., Ltd. can be used as a catalyst.

The amount of the catalyst added is in the range of 0.5 to 5 mol% with respect to ε-caprolactam, and can be appropriately determined in consideration of the weight and wall thickness of the cast nylon molded product.

The catalyst supply means 5 measures the catalyst in the catalyst tank 4 and supplies it to the A raw material tank 8. As the catalyst supply means 5, the same ones as those of the common raw material first supply means 2 and the common raw material second supply means 3 can be used.

The initiator tank 6 stores the initiator. As the initiator tank 6, the same ones as those of the common raw material tank 1 and the catalyst tank 4 can be used.

As the initiator to be blended in the B raw material, for example, known ω-lactams such as N-acetylcaprolactam, acid chlorides, isocyanates, carbonates, isocyanurates and the like can be used. Further, a composition containing caprolactam block HDI isocyanurate and N-methyl-2-pyrrolidone, or a composition containing caprolactam block HDI isocyanurate, N-methyl-2-pyrrolidone and caprolactam is used as an initiator. You can also do it.

The amount of the initiator added is in the range of 0.2 to 3 mol% with respect to ε-caprolactam, and can be appropriately determined in consideration of the weight and wall thickness of the cast nylon molded product.

The initiator supply means 7 measures the initiator in the initiator tank 6 and supplies it to the B raw material tank 10. As the initiator supply means 7, the same ones as those of the common raw material first supply means 2, the common raw material second supply means 3 and the catalyst supply means 5 can be used.

The A raw material tank 8 is a container for storing the A raw material produced by mixing and stirring the common raw material supplied from the common raw material tank 1 and the catalyst supplied from the catalyst tank 4, and the B raw material tank 10 is the common raw material tank. It is a container for storing the B raw material produced by mixing and stirring the common raw material supplied from 1 and the initiator supplied from the initiator tank 6. As the A raw material tank 8 and the B raw material tank 10, the same ones as the common raw material tank 1, the catalyst tank 4, and the initiator tank 6 can be used.

A predetermined amount of common raw material is supplied from the common raw material tank 1 and a predetermined amount of catalyst is supplied from the catalyst tank 4 to the A raw material tank 8. The supplied common raw material and catalyst are mixed and stirred in the A raw material tank 8 to produce the A raw material. The produced raw material A is temperature-controlled and maintained in the raw material A tank 8 under an atmosphere of an inert gas such as nitrogen gas at a temperature of 80 to 140 ° C., preferably 90 to 120 ° C. under stirring.

Raw material A is a mixture of substantially anhydrous ε-caprolactam and a predetermined amount of catalyst. If necessary, a soft component such as ω-laurolactam, a liquid polyether that does not inhibit the polymerization reaction, or liquid polybutadiene can be added as long as it is in the range of 20% by weight or less.

Similarly, a predetermined amount of the common raw material is supplied from the common raw material tank 1 and a predetermined amount of the initiator is supplied from the initiator tank 6 to the B raw material tank 10. The supplied common raw material and initiator are mixed in the B raw material tank 10 to produce the B raw material. The produced B raw material is temperature-controlled and maintained in the B raw material tank 10 under an atmosphere of an inert gas such as nitrogen gas at a temperature of 80 to 140 ° C., preferably 90 to 120 ° C. under stirring.

Ingredient B is a mixture of substantially anhydrous ε-caprolactam and a predetermined amount of initiator. If necessary, a soft component such as ω-laurolactam, a liquid polyether that does not inhibit the polymerization reaction, or a liquid polybutadiene can be added as long as it is in the range of 20% by weight or less.

The A raw material supply means 9 measures the A raw material in the A raw material tank 8 and supplies it to the mixing stirrer 12, and the B raw material supply means 11 measures the B raw material in the B raw material tank 10 and supplies the mixing stirrer 12. Is to be supplied to. As the A raw material supply means 9 and the B raw material supply means 11, the same ones as the common raw material first supply means 2, the common raw material second supply means 3, the catalyst supply means 5, and the initiator supply means 7 can be used.

The mixing stirrer 12 mixes and stirs the A raw material supplied from the A raw material supply means 9 and the B raw material supplied from the B raw material supply means 11. An existing or new mixing stirrer 12 can be used. As the existing mixing / stirring machine, for example, a mixing / stirring unit in a casting nylon molding apparatus (Patent No. 6396619) previously developed and patented by both applicants can be used.

The molding die 13 is for molding the raw material supplied from the mixing stirrer 12 into a predetermined shape. In addition to general metal molds and silicone molds, the molding mold 13 uses, for example, a composite silicone mold previously developed and patented by Nikko Giken Co., Ltd., one of the applicants (Patent No. 5747138). be able to.

Although not shown, the mixing stirrer 12 and the molding die 13 are housed in a vacuum chamber.

According to the casting nylon molding apparatus of this embodiment, since the A raw material and the B raw material are produced in the apparatus, an empty container unlike the molding material in a container is not generated, and a problem of processing the empty container arises. Absent. Further, by automatically setting the amounts of the common raw material, the catalyst, and the initiator in advance, the optimum raw materials A and B can be produced, so that the quality of the molded product can be kept constant. Therefore, it is possible to manufacture a nylon molded product having a certain quality or higher regardless of the skill level of the operator.

(Other embodiments)
Although the description is omitted in the above-described embodiment, the casting nylon molding apparatus of the present invention may be provided with a cleaning apparatus. As the cleaning device, for example, one provided with a cleaning agent tank for storing the cleaning agent and a cleaning agent liquid feed pipe can be used. In this case, the supply and stop of the cleaning agent can be controlled by a valve. The cleaning agent liquid feed pipe may be connected from the cleaning agent tank to one or more of the A raw material tank 8, the A raw material supply means 9, the B raw material tank 10, the B raw material supply means 11, and the mixing stirrer 12. it can.

The cleaning agent includes, for example, a mixture containing N-methyl-2-pyrrolidone and ω-lactam, a mixture containing N-ethyl-2-pyrrolidone and ω-lactam, or N-methyl. A mixture consisting of -2-pyrrolidone, N-ethyl-2-pyrrolidone and ω-lactam can be used.

In addition, N-methyl-2-pyrrolidone containing no impurities can be used as a cleaning agent by itself. The same applies to N-ethyl-2-pyrrolidone containing no impurities. Further, those consisting only of N-methyl-2-pyrrolidone and N-ethyl-2-pyrrolidone can also be used as a cleaning agent by themselves.

A common raw material, that is, substantially anhydrous ε-caprolactam, can also be used as the cleaning agent. The ε-caprolactam (cleaning agent) can also be supplied from the common raw material tank 1 to the cleaning agent tank. In this case, the supply and stop of the cleaning agent from the common raw material tank 1 can be controlled by the valve.

(motion)
The operation of the casting nylon molding apparatus of the above embodiment will be described.
(1) The common raw material in the common raw material tank 1 is weighed by the common raw material first supply means 2 and supplied into the A raw material tank 8. Similarly, the raw materials in the common raw material tank 1 are weighed by the common raw material second supply means 3 and supplied into the B raw material tank 10.
(2) A predetermined amount of the catalyst in the catalyst tank 4 is measured by the catalyst supply means 5, and the predetermined amount of the catalyst is supplied into the A raw material tank 8. Similarly, a predetermined amount of the initiator in the initiator tank 6 is measured by the initiator supply means 7, and the predetermined amount of the initiator is supplied into the B raw material tank 10.
(3) The common raw material and the catalyst supplied to the A raw material tank 8 are mixed and stirred in the A raw material tank 8 to generate the A raw material. Similarly, the common raw material and the initiator supplied to the B raw material tank 10 are mixed and stirred in the B raw material tank 10 to produce the B raw material.
(4) The A raw material produced in the A raw material tank 8 and the B raw material produced in the B raw material tank 10 are supplied to the mixing stirrer 12.
(5) The A raw material and the B raw material supplied to the mixing stirrer 12 are mixed and stirred to generate a molding material.
(6) The produced molding material is poured into the molding mold 13.
(7) The polymerized and solidified molded product is taken out from the molding die 13.

The casting nylon molding method and the casting nylon molding apparatus of the present invention can be particularly preferably used in a large-scale business establishment where hundreds or thousands of conventional containerized molding materials are used at one time. ..

1 Common raw material tank 2 Common raw material first supply means 3 Common raw material second supply means 4 Catalyst tank 5 Catalyst supply means 6 Initiator tank 7 Initiator supply means 8 A raw material tank 9 A raw material supply means 10 B raw material tank 11 B raw material Supply means 12 Mixing stirrer 13 Molding mold 14a A Raw material first liquid feeding pipe 14b B Raw material first liquid feeding pipe 15a A Raw material second liquid feeding pipe 15b B Raw material second liquid feeding pipe 16a Catalyst first liquid feeding pipe 16b Start Agent 1st Liquid Transfer Pipe 17a Catalyst 2nd Liquid Pipe 17b Initiator 2nd Liquid Pipe 18a A Raw Material 1st Liquid Pipe 18b B Raw Material 1st Liquid Pipe 19a A Raw Material 2nd Liquid Pipe 19b B Raw Material 2nd Liquid supply pipe 20 Stirring blade H heater M motor

Claims (4)

In a casting nylon molding method in which a molding material obtained by mixing and stirring raw materials A and B is poured into a molding mold to mold a nylon molded product.
A predetermined amount of common raw material is supplied to each of the A raw material tank and the B raw material tank from the common raw material tank that stores the common raw material common to the A raw material and the B raw material.
A predetermined amount of catalyst is supplied from the catalyst tank for storing the catalyst to the A raw material tank, and the catalyst is supplied.
A predetermined amount of the initiator is supplied to the B raw material tank from the initiator tank in which the initiator is stored.
The common raw material and the catalyst supplied to the A raw material tank are mixed and stirred to obtain A raw material.
The common raw material and the initiator supplied to the B raw material tank are mixed and stirred to obtain B raw material.
The A raw material in the A raw material tank and the B raw material in the B raw material tank are supplied to the mixing stirrer.
The raw materials A and B supplied to the mixing stirrer are mixed and stirred to obtain a molding material.
The molding material in the mixing stirrer is poured into a molding mold to mold a nylon molded product.
A casting nylon molding method characterized by this. It is provided with an A raw material tank for storing the A raw material, a B raw material tank for storing the B raw material, a mixing stirrer for mixing and stirring the A raw material and the B raw material, and a molding mold for pouring the molding material mixed and stirred in the mixing stirrer. In the casting nylon molding equipment
A common raw material tank for storing common raw materials common to the A raw material and the B raw material, and
A common raw material first supply means for supplying a predetermined amount of common raw materials from the common raw material tank to the A raw material tank,
A common raw material second supply means for supplying a predetermined amount of common raw material from the common raw material tank to the B raw material tank,
A catalyst tank for storing the catalyst and
A catalyst supply means for supplying a predetermined amount of catalyst from the catalyst tank to the A raw material tank, and
An initiator tank for storing the initiator and
An initiator supply means for supplying a predetermined amount of the initiator from the initiator tank to the B raw material tank is provided.
A casting nylon molding device characterized by this. In the casting nylon molding apparatus according to claim 2.
The common raw material tank was held at a temperature at which the common raw materials in the common raw material tank did not solidify.
A casting nylon molding device characterized by this. In the cast nylon molding apparatus according to claim 2 or 3.
The inside of the common raw material tank was maintained under an inert gas atmosphere.
A casting nylon molding device characterized by this.

Images