KR20160020864A

KR20160020864A - Superadsorbent resin shredding device

Info

Publication number: KR20160020864A
Application number: KR1020140106150A
Authority: KR
Inventors: 김종석; 진흥기; 이영교; 이성수
Original assignee: 주식회사 엘지화학
Priority date: 2014-08-14
Filing date: 2014-08-14
Publication date: 2016-02-24

Abstract

The present invention relates to a method for manufacturing a gel polymer which is capable of preventing a contact between a blade and a perforated plate during cutting of a gel polymer so as to improve the quality of the product and prolong the life of the manufacturing apparatus, A superabsorbent resin crusher comprising first and second knives installed, a piercing plate and a wheel knife, characterized in that a separating plate is provided between the first knife and the perforated plate about the second knife Device.

Description

[0001] SUPERADSORBENT RESIN SHREDDING DEVICE [0002]

The present invention relates to a superabsorbent resin crushing apparatus, and more particularly, to a superabsorbent resin crushing apparatus which prevents a contact between a blade and a perforated plate during cutting of a gel polymer, thereby improving the quality of the product, To a crushing apparatus.

Super Absorbent Polymer (SAP) is a synthetic polymer material capable of absorbing moisture of about 500 to 1,000 times its own weight. As a result, it is possible to develop a super absorbent polymer (SAM), an absorbent gel Material), and so on.

In addition to hygiene products such as diapers for children, hygiene products such as soil remediation agents for gardening, index materials for civil engineering and construction, seedling-use sheets, freshness preservatives in the field of food distribution, and fomentation materials And is widely used as a material of the substrate.

As a method for producing such a superabsorbent resin, a method of reversed-phase suspension polymerization or a method of aqueous solution polymerization is known.

The reversed-phase suspension polymerization is disclosed in Japanese Patent Application Laid-open No. 56-161408, Japanese Patent Application Laid-Open No. 57-158209, and Japanese Patent Application Laid-Open No. 57-198714. Examples of the method by aqueous solution polymerization include a thermal polymerization method in which the polymerization gel is polymerized in a kneader having multiple shafts while being broken and cooled and a photopolymerization method in which a high concentration aqueous solution is irradiated with ultraviolet rays or the like on the belt to perform polymerization and drying simultaneously It is known.

Polymerization for the production of a superabsorbent resin is generally known as thermal polymerization in a reactor having a stirring function, or photopolymerization using a rotatable belt or the like.

In the case of a method of thermally polymerizing using a reactor having a stirring function, thermal polymerization is carried out with respect to monomers in a reactor to form and discharge a hydrogel polymer, which is then added to a separate cutter or mill to separate the hydrogel polymer And the gel sizing process for cutting or pulverizing to an appropriate size is performed.

However, in the process of moving the hydrogel polymer to the cutter or the pulverizer, the temperature of the hydrogel polymer may be lowered, which is a factor that lowers the efficiency of the gel sizing process.

In addition, the efficiency of the drying step after the gel sizing may be lowered because the drying of the hydrogel polymer is not properly performed during the gel sizing due to the lowering of the temperature of the hydro gel polymer.

In addition, in order to efficiently perform the gel sizing process or the like, when the hydro gel polymer is supplied with additional heat during or after the cutter or the pulverizer, stress due to heat or temperature change added to the hydro gel polymer Therefore, the physical properties of the superabsorbent resin to be finally produced may deteriorate, and it is not preferable from the viewpoint of energy efficiency of the entire production process of the superabsorbent resin.

On the other hand, in the reactor having the stirring function, the monomer composition in the form of an aqueous solution is usually fed from the monomer composition feed part on one side, and the monomer composition is heated in the reactor by the stirring force to polymerize by heating, .

The hydrogel polymer thus formed is discharged to the outside of the reactor through the discharge port on the other side of the reactor.

However, as the polymerization and hydrogel polymer formation proceeds, the viscosity of the monomer composition becomes higher. As a result, it is difficult to advance or discharge the monomer composition or the hydrogel polymer toward the discharge port side of the reactor.

As a result, the continuous supply of the monomer composition, the formation and discharge of the hydrous gel polymer in the reactor may cause a load on the reactor, and the hydrogel polymer in the reactor may be stressed, There is a possibility that the physical properties of the superabsorbent resin finally produced from the polymer are lowered.

As a technique type started from such a problem, there is a technology such as Japanese Patent Laid-Open No. 10-87842 (Apr. 07, 1998).

Japanese Unexamined Patent Application, First Publication No. Hei 10-87842 discloses a pulverizing method using a screw extruder provided with a cutting blade which operates in contact with the inner surface of a perforated plate, wherein an anti-sticking agent such as silicone oil, And a method for supplying the sheet to the contact surface between the stencil sheet and the cutting edge.

However, the polymerization reactor according to the prior art including the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-87842 is a process device for pulling up most of the gel polymer and crushing the gel polymer into a predetermined unit size, and is configured to support the shaft of the conveying screw with a face- The bearing has a structural problem in that it must be in direct contact with the gel polymer during the manufacturing process.

The surface contact type bearing does not solve the problems such as the excessive durability of the device being hindered because it causes excessive frictional heat during operation, particularly during operation without movement of the gel polymer during operation.

In addition, the bearings have structural limitations in a position where they are in direct contact with the gel polymer in the manufacturing process. When the metallic foreign matter or the component material of the gel polymer due to wear of the bearings are fixed for a long time, It is a major factor to deteriorate the quality of products due to carbonization.

SUMMARY OF THE INVENTION The present invention is directed to a superabsorbent resin crushing apparatus which is simple in manufacturing and production and at the same time can ensure the durability of the apparatus.

Particularly, the present invention relates to a method for producing a gel having a structure capable of preventing direct contact with a gel polymer during a manufacturing process by providing a separating plate between a blade and a perforated plate at a position for supporting a shaft of a conveying screw for conveying a gel polymer from a reactor, And to provide a resin crusher.

The superabsorbent resin shredding apparatus proposed by the present invention is provided with a conveying screw and a conveying screw which are provided in a gel sizing section of a polymerization reactor to feed and cut the gel polymer in the polymerization reactor and on a shaft coupled to one end of the conveying screw A first and a second knife installed, a perforated plate and a wheel knife.

Here, a spacing plate is provided between the first knife and the perforated plate about the second knife.

The shaft may be integrally extended to a mounting base for mounting the first and second knives, the perforated plate and the wheel knife, and the end of the shaft of the shaft may not be contacted when the gel polymer is discharged.

The outer end of the housing of the gel-sizing unit may be further provided with an extension cover.

At this time, the outer extension cover supports the end of the support so that the feed screw and the shaft can rotate.

The outer extension cover may be in the form of including a support aid for ball or roll contact bearing application, an outlet for the gel polymer and an opening for discharging water vapor generated upon discharge of the gel polymer, .

According to the superabsorbent resin crushing apparatus according to the embodiment of the present invention, a predetermined separating plate is provided between the first knife and the perforated plate around the second knife to prevent direct or indirect contact with the gel polymer during the manufacturing process It is possible to obtain a technical effect of improving the durability of the manufacturing apparatus as well as the quality of the product such that the frictional heat during the air operation does not affect the manufacturing process as in the preliminary operation before the operation.

Particularly, according to the superabsorbent resin crushing apparatus according to the embodiment of the present invention, the movement path of the gel polymer during the manufacturing process is secured from the shaft support and the outer extension cover so that the direct contact between the shaft support end and the gel polymer is structurally It is possible to fundamentally prevent carbonization due to frictional heat such as metal foreign substances or fixing materials of the gel polymer due to abrasion of the support portion of the shaft.

In addition, according to the superabsorbent resin crushing apparatus according to the embodiment of the present invention, disassembly and assembly of the outer extension cover are freely provided, so that a technical effect that a quick response can be provided in the event of a failure such as a damage to a shaft or a cutting blade .

1 is a schematic diagram showing a superabsorbent resin crushing apparatus according to a first embodiment of the present invention in an exploded state.
Fig. 2 is a schematic diagram showing the superabsorbent resin crushing apparatus according to the second embodiment of the present invention in a partially cut-out and decomposed state.
3 is a cross-sectional view showing a state of engagement of the superabsorbent resin crushing apparatus according to the second embodiment of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the technical structure of a superabsorbent resin crushing apparatus according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

First, a superabsorbent resin crushing apparatus according to an embodiment of the present invention is provided in the gel sizing unit 20 of the polymerization reactor 10 as shown in FIGS.

In the gel sizing unit 20, a gel polymer formed in the polymerization reactor 10 is fed and cut. For example, the feed screw 30 and the first and second knives 23 and 24, A form including the perforated plate 25 and the wheel knife 26 can be mentioned.

At this time, the first and second knives 23, 24, the perforated plate 25 and the wheel knife 26 are sequentially installed on the shaft 40 that forms the center of one end shaft of the feed screw 30 .

3, the first and second knives 23 and 24 are installed close to the screw rotation part for transferring the transfer screw 30, and the first and second knives 23 and 24 are disposed behind the first and second knives 23 and 24, A perforated plate 25 and a wheel knife 26 are sequentially provided.

The first and second knives 23 and 24, the perforated plate 25 and the wheel knife 26 are formed by polymerizing the polymerized monomer Is configured to be able to cut a certain thickness of the gel polymer formed in the reactor (10) and transferred by the transport screw (30) to a polymer adhered to each other.

For example, if the size of the gel polymer to be polymerized in the polymerization reactor 10 is 15 mm × 15 mm and 100 mm × 100 mm, the first and second knives 23 and 24, the perforated plate 25, The gel polymer 26 may be formed in various shapes such as a shape in which the gel polymer is cut to a thickness of 1 mm to 3 mm so that the polymer cut or cut can be adhered to each other.

The superabsorbent resin crushing apparatus according to the embodiment of the present invention is provided with predetermined spacing plates 24a and 24b between the first knife 23 and the perforated plate 25 about the second knife 24 .

At this time, the spacing plates 24a and 24b are circular discs having a thickness of 1 mm or more and 3 mm or less. The thickness of the spacing plates 24a and 24b is preferably set and configured from the cut length of the gel polymer.

2 to 3, the shaft 40 of the superabsorbent resin crushing apparatus according to the embodiment of the present invention includes a support base 42 integrally formed with a mounting base 41, And the outer extension cover 22 may be further provided at the end of the housing 21 of the sizing unit 20.

The mounting base 41 of the shaft 40 is formed to have a length necessary for mounting the piercing plate 25 and the wheel knife 26 from the first and second knives 23 and 24, 42 is provided to extend the end portion of the shaft 40 for supporting the shaft 40 by a predetermined length and is preferably positioned at a position that does not directly contact the end of the support base 42 of the shaft 40 when the gel polymer is discharged It is preferable that the length is such that it can be supported by the support member.

The support 42 of the shaft 40 may be formed to have a length in the range of about 50 mm to 1000 mm. At this time, it is preferable that the total length of the outer extension cover 22 is adjusted in accordance with the length of the support 42 of the shaft 40 on the coupling structure.

According to the superabsorbent resin crushing apparatus according to the embodiment of the present invention, not only the movement path of the gel polymer is secured from the support base 42 of the shaft 40 and the outer extension cover 22, It is possible to solve the problems such as the intervention of the foreign metal due to the abrasion of the support portion of the shaft 40 or the sticking of the gel polymer.

At this time, when the cross-section diameter of the support member 42 is made narrow, the shaft 40 can minimize the interference with the gel polymer being discharged.

Accordingly, the shaft 40 may have a configuration in which the cross-sectional diameter of the support table 42 is smaller than the cross-sectional diameter of the mounting table 41. That is, the shaft 40 may have a stepped structure in which the cross-sectional diameters of the mounting base 41 and the supporting base 42 are different from each other.

In addition, according to the superabsorbent resin crushing apparatus according to the embodiment of the present invention, the technical effect such as the prevention of sticking of the gel polymer over a long period to the support portion of the shaft 40 and the carbonization due to frictional heat are fundamentally prevented .

The outer extension cover 22 can be formed in the form of a cylindrical cover having one opening.

The end of the support 42 of the shaft 40 is coupled to and supported by the closed end of the outer extension cover 22, that is, the other closed side of the cylindrical cover.

The end of the support base 42 of the shaft 40 may support the rotation of the feed screw 30 and the shaft 40 smoothly.

That is, the outer extension lid 22 may be provided with a predetermined support support 22c on the surface where the support stand 42 is fastened.

For example, the support supporter 22c may be a ball or roll contact bearing.

The support supporter 22c minimizes friction between the feed screw 30 and the shaft 40 by driving means connected to the other side of the feed screw 30 to maximize the efficiency of the drive force So that the technical effect can be achieved.

The outer extension cover 22 and the shaft 40 may be spaced apart from the wheel knife 26 to the support supporter 22c by a distance of at least 50 mm to 1000 mm.

When the distance from the wheel knife 26 to the support supporter 22c is less than 50 mm, the first and second knives 23 and 24, the perforated plate 25, It is not easy to structurally prevent direct contact between the end of the support 42 of the shaft 40 and the gel polymer depending on the amount of the gel polymer that has been cut to a predetermined thickness while passing through the wheel knife 26. [

When the distance from the wheel knife 26 to the support supporter 22c exceeds 1000 mm, the length of the outer extension cover 22 and the length of the support 42 of the shaft 40 It is impossible to solve the problem that unnecessary cost of raw materials must be increased.

The outer extension lid 22 may be provided in a manner that the outer extension lid 22 can be disassembled and assembled with the end of the housing 21 of the gel sizing unit 20.

For example, the outer extension cover 22 and the housing 21 of the gel sizing unit 20 may be provided with slit grooves and protrusions that are engaged with each other.

The slit-shaped grooves or protrusions may be formed in such a manner that the outer extension lid 22 and the end of the housing 21 of the gel sizing unit 20 are twisted to each other by a predetermined angle in the state of mutual alignment, And the like.

The outer extension cover 22, which can be disassembled and assembled freely, can cope more quickly when a malfunction occurs in the technology of the gel sizing unit 20, thereby minimizing the loss due to a malfunction of the manufacturing machine.

The outer extension cover 22 may be provided with an outlet 22a or an opening 22b for the gel polymer.

The outlet 22a and the opening 22b are all formed in the shape of a predetermined through hole penetrating the side surface of the cylindrical outer extension cover 22 and the outlet 22a is formed in the housing of the gel sizing portion 20 A part of a cross section formed below the support base 42 of the shaft 40 may be penetrated in a state where the outer extension cover 22 is coupled to an end of the shaft 40. [

The opening portion 22b is for discharging water vapor generated when the gel polymer is discharged. Therefore, when the outer extension cover 22 is coupled to the end of the housing 21 of the gel sizing portion 20, A part of a cross section formed above the support base 42 of the base 40 can be penetrated.

Although the present invention has been described with reference to specific embodiments, it is to be understood that the invention is not limited to those precise embodiments, It is also to be understood that the scope of the present invention is to be modified or altered by those skilled in the art.

10: polymerization reactor 20: gel sizing unit 21: housing
22: outer extension cover 22a: outlet 22b: opening
22c: Supporting support 23: First knife 24: Second knife
24a, 24b: spacing plate 25: perforated plate 26: wheel knife
30: Feed screw 40: Shaft 41: Mounting base
42: Support

Claims

A transfer screw provided in the gel sizing section of the polymerization reactor for transferring the gel polymer in the polymerization reactor; first and second knives provided on one end shaft of the transfer screw; In the water absorbent resin crusher,
And a separating plate is provided between the first knife and the perforated plate about the second knife.

The method according to claim 1,
Wherein the spacing plate is an annular disk formed to a thickness of 1 mm or more and 3 mm or less.

The method according to claim 1,
The shaft is supported so as to extend integrally with a mounting base for mounting the first and second knives, the perforated plate and the wheel knife so as not to contact the end of the shaft of the shaft when the gel polymer is discharged, And an outer extension cover is further provided to support the end of the support rod so that the feed screw and the shaft rotatably support the support rod end.

3. The method of claim 2,
Wherein said outer extension cover comprises a support abutment for ball or roll contact bearing applications.

The method according to claim 1,
Wherein the shaft includes a stepped structure in which the cross-sectional diameter of the support is smaller than the cross-sectional diameter of the mount.

The method according to claim 1,
Wherein the outer extension cover and the shaft are spaced apart from each other by a distance of 50 to 1000 mm between the wheel knife and the support supporter.

7. The method according to any one of claims 1 to 6,
Wherein the outer extension cover is freely disassembled and assembled into a groove and a projection structure that are mutually engaged with the housing end of the gel sizing unit.