JP2005067625A - Method for discharging polymerizable hygroscopic powder - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for discharging a polymerizable hygroscopic powder obtained by a drying process, which is an alkali metal (meth)acrylate powder, from a flexible container bag filled with the powder. <P>SOLUTION: A hanging jig having four or more shafts, each of which extends radially from the center of the hanging jig and has a lifting hook on the projecting end of the shaft, is used. According to the method, hanging belts (4) of the flexible container bag are hung on the lifting hooks to support the flexible container at four or more supporting points vertically in balanced weight bearing, and then the powder is discharged. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a method for discharging a powder from a flexible container bag filled with potassium acrylate, which is a polymerizable hygroscopic powder useful as a raw material for synthesis of various chemicals and derivatives. Specifically, the powder can be easily obtained from a flexible container bag filled with (meth) acrylic acid alkali metal salt powder in the form of a dry powder with little moisture, obtained by separating and drying water from an aqueous solution. It is a method of discharging.

  The polymerizable hygroscopic powder is, for example, (meth) acrylic acid alkali metal salt powder, more specifically, alkali metal acrylate powder and / or alkali metal methacrylate powder, The alkali metal salt powder is useful as a raw material or an intermediate for synthesizing various acrylic ester derivatives and / or methacrylic ester derivatives.

  In general, as a method of obtaining a (meth) acrylic acid alkali metal salt powder as a polymerizable hygroscopic powder, considering that the powder is a substance that is easily polymerized, acrylic acid and / or in water By reacting methacrylic acid with an alkali metal hydroxide or alkali metal carbonate to obtain an aqueous solution containing an alkali metal acrylate and / or an alkali metal methacrylate, the obtained alkali metal acrylate and / or Alternatively, a method of obtaining a dried (meth) acrylic acid alkali metal salt powder by a so-called spray drying method, in which an aqueous solution containing an alkali metal methacrylate salt is brought into contact with a hot air fluid in the form of a spray to remove moisture, is disclosed in Patent Document 1. Patent Document 2 discloses this.

  Further, the obtained (meth) acrylic acid alkali metal salt powder is useful as a raw material or an intermediate for synthesizing various acrylic ester derivatives and / or methacrylic ester derivatives, etc. In the reaction using acid-alkali metal salt powder, since it does not like the presence of water, it is necessary to use (meth) acrylic acid alkali metal salt powder with a low water content, and it should be a fine powder. It is also disclosed in Patent Document 1 that this is desired.

  On the other hand, General Reference 1 describes that (meth) acrylic acid alkali metal salt powders, specifically, alkali metal acrylate and / or alkali metal methacrylate powders are easily deliquescent. . However, in Patent Document 1 and Patent Document 2 described above, a form relating to a spray drying method (spray drying method) which is a method for producing an alkali metal salt of (meth) acrylate which is the polymerizable hygroscopic powder is described. Although partially described, handling methods and handling conditions after manufacturing the powder, and filling the container with a fine powdered alkali metal salt of (meth) acrylate in a flexible container bag or the like However, there is no description regarding what shape of FIBC is optimal for efficient discharge during use or what type of hanging jig can be used for efficient discharge.

  More specifically, since the (meth) acrylic acid alkali metal salt powder is very hygroscopic, it is necessary to maintain a dry state before filling the flexible container. It is necessary to devise the flexible container structure and its discharge method so that the acid-alkali metal salt powder does not absorb moisture.

  Actually, the alkali metal salt (meth) acrylate powder which is the polymerizable hygroscopic powder, when left in the air, absorbs moisture in the air and contains the alkali metal salt (meth) acrylate powder. Not only does the amount of water increase, but the fine powder obtained by the spray drying method reabsorbs moisture due to moisture in the air or a moist gas accompanying the powder after the powder is produced, resulting in bridging between the particles. The diameter becomes large, and finally, it has a property of causing a so-called solidification phenomenon in which a fine powder immediately after drying partially or entirely forms one lump. Therefore, in the case of handling and storing acrylic acid or (meth) acrylic acid alkali metal salt powder represented by alkali metal methacrylate, which is easily deliquescent as described above, fine particles obtained by a spray drying method are used. Strict management is necessary so that the powder does not resorb moisture.

  In addition, it is necessary to adopt a flexible container that is not permeable to moisture and has a high moisture resistance or a structure that can be discharged well. Moreover, the flexible container suitable for use of the (meth) acrylic acid alkali metal salt powder may be easily reused after use.

  In this way, strictly managing the dry state of the powder is costly and complicated. In some cases, depending on the handling conditions and storage conditions of the filled flexible container bag, even if the flexible container bag has an inner bag made of a sealing material so that the powder does not easily absorb moisture, In some cases, the solidification phenomenon or the solidification phenomenon may occur, which makes the discharge process difficult. Therefore, a method that can efficiently discharge the powder even if the powder absorbs moisture and a solidification phenomenon occurs is widely desired.

  As a representative example of the polymerizable hygroscopic powder targeted by the present case, there is an alkali metal (meth) acrylate, but the hygroscopicity is very high, both as a production method and in a process of filling a container after production, Alternatively, it is a powder that is very susceptible to dampness even in state management from filling into a container until use.

  Usually, when using the powder, the flexible container bag may be transferred to a reaction container or storage tank.In many cases, the flexible container bag is used by using a hoist lane hook that is movable on the site. , Moved from the pallet, etc., stopped in the upper space of the desired location and discharged. In this case, there are cases where a plurality of suspension belts of the flexible container bag are conveniently suspended together using one hook. (See FIG. 4 below.) When the load is concentrated at one point and suspended, the flexible container bag is surely loaded from the outside of the belt, so that it can be efficiently discharged at the initial stage of discharging.

  However, there is a case where the inner bag of the sealing material in the flexible container bag is gradually lowered toward the discharge port at the bottom part from the middle, and the load is applied to the bottom part at once and causes a blocking phenomenon at the discharge port. Once blockage due to such slipping of the inner bag begins to occur, the discharge speed is extremely reduced, and manual discharge work is required. In particular, when a part of the solidification phenomenon occurs in the powder, a decrease in the discharge speed of the powder becomes a problem when the suspension is collectively suspended and discharged using the one hook.

  However, there are not many documents specifically describing the discharge conditions from the flexible container bag filled with the hygroscopic polymerizable powder, and it has been difficult to take a very troublesome discharge form. On the other hand, in the patent group of the flexible container bag itself, there are the following patents, all of which are specifically described regarding discharge conditions from the flexible container bag filled with the hygroscopic polymerizable powder. It is not literature.

  For example, Patent Document 3 describes a flexible container having a structure in which a reinforcing lateral belt is provided as a flexible container bag (hereinafter sometimes abbreviated as a flexible container) excellent in powder leakage and shape stability. However, although this flexible container also has a discharge port at the bottom, there is no description of how to suspend and how it can be discharged quickly. In addition, when filling the powder with high hygroscopicity and easy to unite, it is a state to expel quickly, or the solidification phenomenon has occurred in a part of the flexible container, the powder and its solidified mass are mixed and loaded However, there is no description of hanging conditions for prompt discharge.

  Patent Document 3 describes the transport mode of powders such as carbon black, but there is no description of highly hygroscopic materials and powders that are easily solidified, and the inner bag formed of a sealing material. Is not described, and the flexible container targeted in Patent Document 3 is not considered to be a double-structured flexible container suitable for filling the polymerizable hygroscopic powder.

  Patent Document 4 describes a flexible container including a static elimination device having a conductive attachment portion and a conductive contact portion. The figure shows a form of hanging the belt of the flexible container bag together with a hook at the end of the hoist chain as a fulcrum (one point). In such a fishing form, in particular, moisture absorption is described. It is difficult to discharge quickly when it is filled with a material that is easy to unite and is easy to unite. In addition, when the powder is filled with non-moisture-absorbing powder that satisfies the production conditions or storage conditions of the powder, the powder can be removed from the bottom of the flexible container even at one point. Although it is possible to discharge the body, some solidification occurs inside the flexible container, and the powder and its solidified lump are mixedly loaded. When the powder becomes wet or solidified, the discharge speed becomes slow and the discharge process takes time. In fact, this document relates to the problem of discharging that has such a highly hygroscopic powder, the problem of discharging caused by the problem of the hygroscopic property of the powder, and the solution. Is not described. Also, in Patent Document 4 described specifically as powders are easily charged plastics such as PVC and PE, melamine, sugar and the like.

  Further, Patent Document 5 describes a device for opening a flexible container by cutting the bottom of the flexible container with a cutter in a container body as a flexible container opening device. Moreover, although the structure of the hanging instrument and upper lid which requires two hooks inside the upper lid of the container is shown, only two hooks that can be suspended are shown. The unsealing device can achieve prevention of contamination caused by scattering of powder, improvement of sanitary environment, and efficiency of suspension work. As shown in P8 of FIG. 10 and FIG. 10, the specific operation method uses the upper lid as a hanging device, and cuts the bottom of the flexible container with a cutter installed in the container body. In this method, the powder is dropped into the container, the upper lid is closed, the blade provided on the bottom of the container is rotated, and the powder is guided to the bottom of the container and discharged.

  Therefore, the said patent document 5 is not the method of discharging | emitting powder from a flexible container by an open system. Further, it is not a method of directly charging powder from a suspended flexible container into a container or the like used in the next process. Moreover, the hanging form currently disclosed is also two points. Moreover, there is no description of the handling form of the polymerizable hygroscopic powder which is the subject of this case. Therefore, this is an unrelated form. That is, Patent Document 5 does not disclose any purpose of preventing the slipping phenomenon of the inner bag in the double-structured flexible container bag, which is the focus of the present case. Tsukasa neither describes nor suggests a form of handling a flexible container bag having a double structure or a specific type of cohesive polymerizable material.

Patent Document 6 describes a plurality of hangers suspended on a conveyor and a flexible container structure that can be attached to and detached from the hangers as a technique related to a transport device for organizing and putting out a flexible container bag. As a hanging jig disclosed as a specific example, a hanging jig having a structure that can be inserted into a material charging portion at the top of a flexible container bag and hung on a hanger is described. The purpose of this case is to suspend the filled flexible container bag and discharge the filled specific powder that is easy to absorb moisture. This field is different from the technology for organizing and clearing flexible containers. Moreover, the said patent document 6 has no description regarding the discharge form of material at all.
Although the shape of the FIBC specifically disclosed is a cylindrical shape, the position of the suspension belt described is a belt that supports the FIBC via the upper portion of the FIBC. It is thought that stress is not easily transmitted to the body. Further, there is no description as to whether or not the flexible container can handle a deliquescent polymerizable hygroscopic powder.

  Patent Document 7 describes a technique for obtaining potassium acrylate having a moisture content of 2000 ppm or less by bringing potassium acrylate powder separated and dried from a solution into contact with a dry gas in a stock tank. In Examples and the like, it is described that potassium acrylate having a low water content is obtained. However, as a form of actual contact with dry air, the 0033 stage of the above-mentioned patent document includes the amount of dry gas to be contacted. However, even if the process diagram described as a reference diagram is unknown, the exhaust port for the dry gas is not found, and the drying conditions for obtaining potassium acrylate having a low water content are not sufficiently described. In fact, if the conditions for contact with dry air are insufficient, even if the apparent moisture is low, the container may be agglomerated during storage after filling, which is a problem.

Moreover, it is only described that the container to be filled is also filled with a moisture-proof container (the above-mentioned publication P4, 0033 stage). For example, if it is a flexible container as a container, a description of what shape flexible container is used is described. Absent. Further, there is no description regarding a specific form of hanging the flexible container.
Patent Document 8 describes a structure in which the bottom portion is formed of a flexible material as a powder container, and the angle of the descending slope can be adjusted with a string so that the bottom portion becomes a descending slope when the filling is discharged. Has been. The position of the suspending belt specifically described is the same as that of Patent Document 6, and it is considered that stress is not easily transmitted to the powder inside. Further, there is no description as to whether or not the flexible container can handle deliquescent polymerizable hygroscopic powder.

  As described above, in the literature so far, a highly deliquescent (meth) acrylic acid alkali metal salt powder, which is a representative example of polymerizable hygroscopic powder, is filled and stored in a dry state, and discharged efficiently during discharge. For this reason, specific technology is described regarding the structure of flexible containers that can be stored and handled (exhaustability) better, and what type of suspension jig can be used for efficient discharge. There was no literature. In other words, it is easier to store the (meth) acrylic acid alkali metal salt powder with good discharge and to make full use of flexible containers that are simple containers, specifically one-way flexible container bags. There have been few studies on technologies that can be discharged.

JP 47-31924 A

Japanese Patent Laid-Open No. 49-11820 JP 2001-341792 A Japanese Patent Laid-Open No. 9-50896 JP 2002-145221 A JP 2001-253522 A JP 2003-12599 A JP 2003-26283 A

  Accordingly, an object of the present invention is a polymerizable hygroscopic powder having a CRH of 60% or less and a moisture content of 2000 ppm or less, and a highly hygroscopic (meth) acrylic acid alkali metal salt powder immediately after drying. Concerning the flexible container bag filled with the non-flexible container bag having the inner bag of the sealing material while maintaining the form, the device of the inner bag of the sealing material can be more quickly and devised by devising the hanging jig structure. It is an object of the present invention to provide a method for discharging the discharge port so that the discharge port is less likely to be clogged.

  In order to solve the above-described object, in the discharging method of the present invention, a hanging jig that supports the hanging belt of the flexible container bag in a substantially vertical direction is used. By selectively adopting a specific form from various hanging forms, the contents are removed from a flexible container bag filled with a polymerizable hygroscopic powder having a CRH of 60% or less and a water content of 2000 ppm or less. It is characterized by being discharged promptly.

  Further, by paying attention to the specific surface area that is one of the indicators of the preferable dry state of the filled powder, the powder can be handled as a more preferable dry powder. As a result, paying attention to the specific surface area of the powder, after the storage or storage so that the specific surface area of the powder is within a specific range, the discharge method of the present invention may be carried out. Become. In addition, by adopting the above conditions, the discharge method of the present invention can discharge the polymerizable hygroscopic powder while maintaining a specific discharge rate, and the polymerizable hygroscopic powder is filled. This is a very preferable index as a method of discharging the powder from the flexible container bag.

  The powder targeted by the present invention is very hygroscopic, has a cohesive property (a property that is easy to solidify), and even when filled in a flexible container bag having an inner bag of a sealing material, the production conditions of the powder In addition, depending on the storage conditions or storage conditions of the flexible container bag, a unity phenomenon may occur in a part of the filled powder, which may make it difficult to discharge. However, by adopting the discharge method of the present invention, even if a unity phenomenon occurs in a part of the powder, a suspension condition is adopted in which a load is applied to the flexible container bag evenly in the vertical direction. Thus, the discharge time can be made very short.

  In addition, if the polymerizable hygroscopic powder is 60% or less and has a moisture content of 2000 ppm or less, the CRH presenting a smooth state immediately after production, in which no cohesion phenomenon has occurred, is quickly discharged. I found out that I can do it.

  By adopting the above-mentioned discharge method, the process at the time of use of the powder, for example, the transfer process to the container and the charging process to the reaction container can be easily performed.

  In addition, when a double-layer flexible container bag having an opening at the bottom is suspended by concentrating each belt on one hanging hook and suspending it in a single point, the polymerizable hygroscopic powder that is the subject of this case It can be discharged, but the load concentrates around the opening in the lower part, and the packing collects near the opening. It turns out that the speed can be slow.

  Therefore, when the hanging jig as in this case is adopted and discharging is performed so that the load is evenly applied, even if it is a flexible container bag with a double structure having an opening at the bottom, it is sufficient even if the bottom is conical. It became a conical shape with a height, that is, a shape that was sufficiently extended from the bottom surface, so that no material gathered around the discharge port, and an average load was applied to the entire bottom surface. As a result, an excessive load is not applied to the discharge port, and the discharge can be performed smoothly. In addition, the double-structured flexible container bag having an opening in the lower portion employed in the present case has a structure in which the bottom surface protrudes outward when discharged. The effect of the discharge method of the present invention is that the protruding form can be performed more smoothly.

  In particular, in a double-structure flexible container bag having an inner bag formed of a sealing material and having a discharge port on the bottom surface, the load is concentrated at one point and suspended (one by one). The load is applied to the bottom at a stretch and the inner bag is clogged with the discharge port. Therefore, by suspending at a plurality of fulcrum points, for example, four fulcrum points, the discharge port on the bottom surface portion can be easily protruded and the discharge amount can be increased. In other words, it has been found that by supporting the flexible container bag in the vertical direction and with equal load at three or more (preferably four or more) fulcrums, it becomes easier for the outlet to be discharged out of the outer bag at the bottom. By applying to the flexible container bag filling of the polymerizable hygroscopic powder that is the subject of this case, the discharge process has been shortened and simplified. It was also found that even when partially solidified, it can be discharged more smoothly by adopting the above discharge method.

  The present invention will be described more specifically below. The configuration of the present invention is as follows.

(Configuration 1)
A top surface portion having a filling port (1), a bottom surface portion (3) having a discharge port (2), filled with a polymerizable hygroscopic powder having a CRH of 60% or less and a water content of 2000 ppm or less, at least 4 An exterior part (6) having a side part (5) in which a plurality of suspension belts (4) are sewn, and an inner bag part (7) formed of a sealing material inside the exterior part (6) The polymerizable hygroscopic powder is discharged from the flexible container bag formed from the above, and a lifting hook is provided at each protruding end of four or more axes extending radially from the center of the hanging jig. A suspension jig having a suspension container is used, the suspension belt (4) of the flexible container bag is suspended from the lifting hook, and the flexible container bag is loaded in the vertical direction by the suspension belt (4). The polymerizable hygroscopic powder is discharged from the discharge port in the bottom of the flexible container bag after being lifted so as to be supported by four or more fulcrums. Is the method.

(Configuration 2)
Each of the protrusions at a position where a plurality of axial lines extending in a radial manner from the center of each hanging jig intersect with each shape member is any one of a plate shape, a square shape and a well shape. The above-described polymerizable hygroscopic powder discharging method using a lifting jig having the lifting hook.

(Configuration 3)
The hanging jig is
Four or more axes extending radially from the center of the suspension jig are in the shape of a support rod, the support rod is arranged in the horizontal plane direction of the jig, and is lifted at each protruding end of each support rod This is a method for discharging the above polymerizable hygroscopic powder using a hanging jig provided with a hook.

(Configuration 4)
When the flexible container bag is suspended and the bottom surface (3) and the discharge port (2) are closed, the flexible container bag is provided when the flexible container bag is viewed from the bottom surface (3). An extension of the side surface belt (8) sewn to the side surface portion (5) of the suspended belt (4) to the bottom surface portion is also sewn to the bottom surface exterior exterior portion (9). The outlet binding string passing portion installed in the extension portion of the side surface belt (8) so that the extension portion of the belt (8) to the bottom surface portion intersects at the center point of the bottom surface portion (3). A method for discharging the polymerizable hygroscopic powder as described above, wherein a flexible container bag is used that is closed by a discharge port binding string.

(Configuration 5)
The side portion (5) of the exterior portion (6) of the flexible container bag is an extension of the suspension belt (4) in a direction parallel to the direction of gravity when the flexible container bag is suspended. A side belt (8) is sewn to the side (5)
Further, the bottom surface portion (3) of the exterior portion (6) is provided with a bottom surface external exterior portion (9) that becomes a chrysanthemum structure when opened for discharging the powder, and a discharge port (2). When the flexible container bag is hung by the hanging jig, the discharge port (2) can be protruded outside by its own weight of the powder as a filler when the bottom container portion (10) is provided. In addition, a flexible container bag is used in which the bottom surface external exterior portion (9) and the bottom surface internal exterior portion (10) are sewn around the joint (11) of the bottom surface portion (3) and the side surface portion (5). This is a method for discharging the polymerizable hygroscopic powder.

(Configuration 6)
The polymerizable hygroscopic powder filled in the flexible container bag is a (meth) acrylic acid alkali metal salt, and the (meth) acrylic acid alkali metal salt is used at 150 ° C. using nitrogen as an adsorption gas. 60 minutes degassed the powder the specific surface area measured using the BET specific surface area ^meter, in the state of 0.8m ² /g~2.5m 2 / g, the discharge of the polymerizable hygroscopic powder Is the method.

(Configuration 7)
This is a method for discharging the polymerizable hygroscopic powder, wherein the polymerizable hygroscopic powder is discharged at a discharge rate of 6 kg / min to 360 kg / min when the capacity of the flexible container bag is 200 L to 2000 L.

(Configuration 8)
The alkali metal salt of (meth) acrylic acid, which is a polymerizable hygroscopic powder having a CRH of 60% or less filled in the flexible container bag, is produced through a spray drying process, and further includes a moisture content. The above-mentioned polymerizability is obtained by transferring (meth) acrylic acid alkali metal salt powder having a water content of 1000 ppm or less using a storage and filling gas having a water content of 6 g / m ³ or less and filling the flexible container bag. This is a method for discharging hygroscopic powder.

(Configuration 9)
The method of discharging polymerizable hygroscopic powder as described above, wherein the sealing material forming the inner bag part (7) is an aluminum laminate material or an aluminum vapor deposition material.

  The objective of this invention is providing the method of discharging | emitting the (meth) acrylic-acid alkali metal salt with which the FIBC of the specific structure was filled using a specific hanging jig. Preferably, the discharge method of alkali metal salt of (meth) acrylate is characterized by discharging from the flexible container at a rate of 6 kg / min to 360 kg / min.

  A more preferable discharging speed is 12 kg / min to 180 kg / min. More preferably, the rate is 18 kg / min to 120 kg / min. More preferably, the speed is 18 kg / min to 100 kg / min.

  By hanging the flexible container on the jig used in the present case, the filled (meth) acrylic acid alkali metal salt is passed through the hanging belt (4) sewn on the side surface (5). And the stress in the vertical direction due to the weight of the powder is applied, and the powder can be discharged efficiently. Moreover, since it becomes easy to flow in air from a discharge port at the time of discharge | emission by suspending on the jig | tool used in this case, the said powder can be discharged | emitted very rapidly. In addition, the powder is easily solidified and agglomerated due to the influence of moisture, etc., but it can be quickly discharged even if there are solidified or agglomerated parts by hanging it on the jig used in this case. Can do.

  In addition, when the discharge method of the present case is applied to a flexible container having three hanging belts, a polymerizable hygroscopic powder having a CRH of 60% or less and a water content of 2000 ppm or less was filled. A top surface portion having a filling port (1), a bottom surface portion (3) having a discharge port (2), an exterior portion (6) having a side surface portion (5) to which three hanging belts (4) are sewn, And a method of discharging the polymerizable hygroscopic powder from a flexible container bag formed from an inner bag portion (7) formed of a sealing material therein, and radiation from the center of the hanging jig A suspension jig having a lifting hook at each protruding end of three axes extending in a shape, and the suspension belt (4) of the flexible container bag is suspended from the lifting hook. Bag The polymeric hygroscopic powder is discharged from the outlet at the bottom of the flexible container bag after being lifted by the hanging belt (4) so as to be supported at three fulcrums in the vertical direction and at an equal load. It may be applied as a powder discharging method characterized by the above.

  In this case, it is formed from an exterior part (6) having a side part (5) to which at least three suspension belts (4) are sewn, and an inner bag part (7) formed of a sealing material therein. In the flexible container bag, the upper part of the three suspension belts (4) is preferably provided with a ring or an equivalent ring shape so that it can be easily suspended from the lifting hook.

  On the upper part of the suspension belt (4), a ring or a ring shape corresponding thereto is provided so that the suspension hook can be easily suspended. 5) Even in a flexible container bag formed from an exterior part (6) having an inner bag part (7) formed of a sealing material inside, the vertical part is also suspended at an equal load. An exterior portion (6) having a side surface portion (5) to which at least four or more suspension belts (4) are sewn, and an inner bag portion (7) formed of a sealing material therein. The effect similar to the form using the flexible container bag formed from can be taken out. However, it may become slightly unstable when suspended.

  Therefore, a more preferable discharging method of the present invention is that an exterior part (6) having a side part (5) in which at least four hanging belts (4) are sewn and an inner part formed of a sealing material therein. The flexible container bag formed from the bag portion (7) is lifted by the hanging belt (4) so as to be supported at four fulcrums in the vertical direction and at the same load, and is then attached to the bottom portion of the flexible container bag. In this method, the polymerizable hygroscopic powder is discharged from a certain outlet.

  More specifically, in the case of lifting so as to be supported by four fulcrums, as shown in FIGS. 1 and 2 of the present case, four multiple hanging belts (sewn on the side surface portion (5)) ( 4) is preferably in the form of being joined to another hanging belt in a loop shape at the top of the flexible container bag. In this case, when the flexible container bag is viewed from above at the upper part, the hanging belt (4) that extends and joins the upper part into one hook is attached to two hooks one by one. It is suspended in a slightly inner form. (Refer FIG. 1) The structure of a flexible container bag can be simplified compared with the form which makes four belts separately. A specific structure of the flexible container bag is shown in FIG.

  Further, as a modified form, the four plural hanging belts (4) are sewn on the side surface part (5) separately without forming a loop or the like above the flexible container bag. In this case, like the suspension belt (4) when suspended at the above three points, a ring or the like is attached to the upper part of the four suspension belts (4) so that the suspension-like hook can be easily suspended. It is preferable that a ring shape is provided. In particular, this modification is not illustrated. Naturally, there is also a discharging method using a flexible container bag in which the four plural hanging belts (4) are not sewn on the side of the flexible container bag (4) but are sewn separately on the side surface (5). It is a preferred embodiment of the present invention.

  Further, in the case of a flexible container bag provided with four or more, that is, five or six hanging belts, similarly, the belt may be appropriately hung on a hook or a ring may be provided at the tip. . Further, the number of hooks in the hanging jig may be appropriately changed in accordance with the number of belts.

  More specifically, the shape of the flexible container bag is maintained from the first stage to the second stage of the discharge process by supporting the flexible container bag evenly at at least three fulcrums, and the powder is discharged from the discharge port to the inner bag. Since the inflow of air is promoted, the discharge speed of the powder is remarkably improved. If it is 1 point, it will be somewhat decompressed, and the clogging phenomenon at the discharge port is likely to occur especially in the later stage of the discharge process. Once the clogging phenomenon occurs, it cannot be solved easily, and the discharge speed is extremely reduced. Perhaps one point is considered to be a stress that tightens from the outside of the flexible container bag to the inside through the hanging belt, so that the inflow of air into the inner bag is hindered and the discharge speed is reduced.

  Therefore, in the discharging step, a mode in which an air inflow port is provided on the upper portion of the flexible container bag is more preferable. Specifically, before hanging on the hanging jig, a part of the upper filling port is opened, and the upper portion of the inner bag portion may be cut so that air can be conducted to the inside of the inner bag. .

  In addition, when the flexible container bag is suspended from the hanging jig, the flexible container bag is installed so that the surface of the upper surface of the flexible container bag and the surface shared by the plurality of axes in the hanging jig are positioned in parallel. The surface of the container bag upper surface and the surface shared by the plurality of axes are parallel to the ground. The surface shared by the plurality of axes is defined as a horizontal reference plane (angle 0 degree), and the angle formed by the surface, the suspension belt and the suspension jig positioned at the end of the axis of the suspension jig, It is preferably in the range of 70 to 150 degrees. More preferably, it is 75 to 135 degrees. More preferably, it is 80 to 120 degrees, more preferably 85 to 105 degrees. Most preferably, it is 90 degrees. If this angle is small, it will be close to the form of one point, and the effect supported by the multiple fulcrums of this case will be difficult. If this angle is too large, the stress that is pulled between the flexible container bag and the belt acts, and the sewing may be damaged.

  More specifically, referring to FIG. 9, the angle ∠ EFC is a case where the angle formed by the suspension belt and the suspension jig is 90 degrees. The angle ∠ EFD is a case where the angle formed by the suspension belt and the suspension jig is 70 degrees. The angle ∠ EFB is when the angle formed by the suspension belt and the suspension jig is 150 degrees. The angle formed by the suspension belt and the suspension jig in this case is preferably in the range of 70 to 150 degrees with the horizontal plane including the straight line AE as the horizontal plane being 0 degrees. More preferably, it is in the range of 75 to 135 degrees. More preferably, it is in the range of 80 to 120 degrees, more preferably in the range of 85 to 105 degrees. Most preferably, it is 90 degrees.

  Further, the structure of the hanging jig will be described with reference to FIG. The shape of the lifting jig according to the present invention is not particularly limited, but the lifting jig has a lifting hook at each protruding end of four or more axes extending radially from the center of the lifting jig (also referred to as diagonal lines). The shape of the shape. The axially extending axial portion has a support bar shape. In addition, it is preferable that the shape of the support bar is a reinforcing rib structure reinforced in a T-shape, for example. Further, the support rod shape may be reinforced with an H-shaped rib. Since a load is applied along the axis when the flexible container bag is suspended, it is preferable that a reinforcing plate 108 as shown in FIG. If there is no reinforcing plate shape, a plurality of four or more axes extending radially may be crossed at the center and fixed to each other.

  More specifically, the star-shaped square shape (square shape) shown in FIG. 1 and the flat plate shape shown in FIG. 3 can be exemplified. FIG. 1 shows a square shape 100 extending radially from the center of the star. There are four or more U-shaped lifting jig upper hooks 101 at the center of the lifting jig, and extending radially (or diagonally) from the center with a reinforcing plate 108 as necessary. A plurality of axis portions (support bar shape) are fixed. Along the diagonal line of the rectangular shape, there is a reinforcing rib structure 102 that is a specific structure of the axial portion, and the reinforcing rib structures 103 are reinforced by reinforcing bars 103 in the middle. There is a hook 104 at the end of the reinforcing rib structure. The suspension belt of the flexible container bag is suspended from the hook 104. The material of the suspension jig is plastic, fiber reinforced thermosetting resin, synthetic resin such as FRP such as fiber reinforced thermoplastic resin (fiber reinforced PP, fiber reinforced PE, etc.), or metal such as SUS, iron, aluminum. is there. Since strength is required, iron and SUS are preferable. Further, SUS is preferable in consideration of corrosion. Moreover, well-known thermosetting resin and thermoplastic resin can be used for the said synthetic resin.

  In order to further reduce the weight of the reinforcing rib structure, as shown in FIG. 10, the upper surface of the reinforcing rib structure has a flat portion 105, and the vertical reinforcing rib 106 is T-shaped so as to be orthogonal to the flat portion. Configured. A loop jig 107 is provided at the end of the reinforcing rib 106, and a hook 104 for suspension is provided via the loop jig 107. The support rod shape may be a rod-like hanging jig or a cylindrical hanging jig that is not such a reinforcing rib structure, but when the jig is manufactured from SUS or iron, the support rod portion itself Therefore, it is necessary to devise the allowable load of the hoist lane. Further, by adopting a cylindrical structure, the weight can be reduced in the same manner as the rib structure.

  Further, when the suspension jig is formed from a synthetic resin material such as FRP, the amount of glass fiber or carbon fiber blended in the synthetic resin is 30%, where the amount of synthetic resin used is 100% by weight. It can be set as the material which gave the intensity | strength by raising to -70weight%, and can also be used as a shaping | molding material of the suspension jig | tool of this case. Even if the fiber content is increased too much, the resin used is too small to increase the strength. Therefore, the preferred fiber content is 30 to 60% by weight.

  Moreover, when manufacturing the said hanging jig with a synthetic resin preferably, it can also manufacture by manufacturing the component which consists of the said material by press molding using a predetermined metal mold | die, and joining each component. . Alternatively, the reinforcing rib structure, the cylindrical structure, and other members can be formed by drawing a thermoplastic resin or a thermosetting resin matrix resin together with glass fibers through a predetermined mold. . Each member formed in this way constitutes the hanging jig by bolts, adhesion or welding, or welding if it is metal. If it is a glass fiber according to a known method, a predetermined resin (eg, PP, PE, unsaturated polyester resin, or epoxy resin) is selected. For carbon fiber, a predetermined resin (vinyl ester resin) is selected. If necessary, an interfacial treatment agent such as a coupling agent is used in combination to increase the interfacial adhesion strength between the fiber and the matrix resin. When manufacturing a hanging jig by FRP or the like, it is preferable to devise the thickness of each member by the load of the flexible container to be hung.

  Further, in the present invention, it is preferable that the suspension jig having a T-shaped rib structure to make each constituent member as thin as possible as shown in FIG. It is a preferable structure from the point that the lowered form is more stable and the point that the suspension jig is easier to manufacture.

  Further, the suspension jig is structured so that the flexible container bag is stably suspended, and the four support rod shapes shown in FIG. 1 and the like are used to quickly discharge the filled powder. The form which is a square shape (square shape) with the corners arranged just diagonally is preferable.

  Further, when a plate-like hanging jig as shown in FIG. 3 is used, for example, when it is a square shape, reinforcing ribs may be provided on the back surface of the plate in a direction along the diagonal axis. . It is also possible to replace the plate-like portion with a lighter material such as FRP. In the case of a normal glass fiber reinforced resin, if the glass fiber content is 30%, the thickness of the plate-shaped molded product is set to about 15 to 30 mm, thereby manufacturing an FRP plate-shaped hanging jig applicable in the present case. be able to.

  The flexible container bag filled with the powder using the hanging jig of the present invention is preferably a one-way flexible container bag. The flexible container bag filled and stored with the polymerizable hygroscopic powder may have a unity phenomenon, and it is always a fresh flexible container bag when it is filled when producing the powder by making it one-way. Can be used. By being one-way, if necessary, a tear hole can be provided in the upper surface when discharging and the discharge can be performed more smoothly. In addition, the outer bag of the one-way flexible container bag is generally thin in shape, and when the flexible container bag is suspended, the outer bag tends to have a reverse shape. Therefore, it becomes a preferable form to adapt the discharge method of the present case.

  As a method of obtaining the (meth) acrylic acid alkali metal salt powder used in the discharging method of the present invention, the powder is an acrylic acid and / or methacrylic acid in water considering that it is a substance that is easily polymerized. And an alkali metal hydroxide or an alkali metal carbonate to obtain an aqueous solution containing an alkali metal acrylate and / or an alkali metal methacrylate, and the obtained alkali metal acrylate and / or methacrylic acid is obtained. (Meth) acrylic acid alkali metal salt powder produced through the so-called spray-drying method (spray-drying method), which removes moisture by bringing an aqueous solution containing an acid-alkali metal salt into contact with a hot air fluid in the form of a spray. .

  FIG. 5 shows a typical structure of a flexible container filled with the (meth) acrylic acid alkali metal salt powder. The flexible container used in the filling method of the (meth) acrylic acid alkali metal salt powder and the method of using the (meth) acrylic acid alkali metal salt powder of the present invention has an upper surface portion having a filling port (1) and a discharge port (2 ) Provided with a bottom surface part (3), a side part (5) having a hanging belt (4), and an inner bag part (7) formed of a sealing material therein. A side belt (8) is formed on the side surface (5) of the exterior portion (6) in a direction parallel to the direction of gravity when the flexible container is suspended. The bottom part (3) of the exterior part (6) is sewn on the part (5), and the bottom part external exterior part (9) having a chrysanthemum structure and the inside of the bottom face provided with the discharge port (2) It has a double structure of the exterior part (10), the bottom part external exterior part (9) and the bottom part inside The exterior portion (10) is connected to the bottom surface portion (3) and the side surface portion (5) so that when the flexible container is suspended, the discharge port (2) can be pushed out by its own weight or by its own weight. Is a flexible container in which a bottom surface portion external exterior portion (9) and a bottom surface portion internal exterior portion (10) are sewn around (11).

  More preferably, the exterior portion (6) is sewn so that the shape of the exterior portion (6) is substantially a polygonal prism shape, and there are at least three suspension belts (4) and side surface belts (8) in the flexible container. That's it.

  In the discharging method of the present invention, as the flexible container bag (which may be abbreviated as a flexible container in the specification), the flexible container bag is suspended, and the bottom surface portion (3) and the discharge port (2) are closed. In this state, when the flexible container bag is viewed from the bottom surface portion (3), the side surface belt (8) sewn to the side surface portion (5) of the hanging belt (4) provided in the flexible container bag. The extension part to the bottom face part is also sewed on the bottom face external exterior part (9), and the extension part to the bottom face part of the side face belt (8) intersects at the center point in the bottom face part (3). As described above, a flexible container bag that is closed by the outlet binding string through the outlet binding string passing part installed in the extension of the side belt (8) is used. It is preferable to.

Further, the side belt (5) of the exterior part (6) of the flexible container bag is extended with a suspension belt (4) in a direction parallel to the direction of gravity when the flexible container bag is suspended. The side belt (8), which is the part, is sewn to the side (5),
Further, the bottom surface portion (3) of the exterior portion (6) is provided with a bottom surface external exterior portion (9) that becomes a chrysanthemum structure when opened for discharging the powder, and a discharge port (2). When the flexible container bag is hung by the hanging jig, the discharge port (2) can be protruded outside by its own weight of the powder as a filler when the bottom container portion (10) is provided. In addition, a flexible container bag is used in which the bottom surface external exterior portion (9) and the bottom surface internal exterior portion (10) are sewn around the joint (11) of the bottom surface portion (3) and the side surface portion (5). It is preferable.

  In order to make it easier for the (meth) acrylic acid alkali metal salt powder, which is the filling inside, to be easily discharged through the side surface belt when it is suspended during discharge, The shape of (6) is sewn so as to be substantially a polygonal prism shape, and there are at least three suspension belts (4) and side surface belts (8) in the flexible container, and the flexible container is attached to the bottom surface. When viewed from the side, the suspension belt (4) passes through the center point of the flexible container and crosses the diagonal, and the side belt (8) extends the diagonal to the side (5) and the bottom. It is preferable to arrange and sew along the side in the longitudinal direction of the polygonal column shape on the line.

  Further, the side surface belt (8) is an extension from the suspension belt (4) and preferably extends to the bottom surface portion, and is preferably sewn to the bottom surface external exterior portion (9). Moreover, although it is a sealing material which forms an inner bag part (7), if it is a material which has moisture resistance, it can employ | adopt. Specifically, polyethylene, PP, PET, PVC, an aluminum laminate material, and an aluminum vapor deposition material. An aluminum laminate material or an aluminum vapor deposition material is a preferred form because it prevents moisture from entering and prevents static electricity from occurring. Further, when the powder is filled in the inner bag part (7), it is preferable that the inner bag part (7) is heat-sealed in order to prevent moisture from entering from the outside. Therefore, it is preferable that the material be heat-sealable.

  Moreover, it is preferable that a member capable of releasing static electricity generated when filling the powder to the ground is provided as necessary. For example, at the time of filling, static electricity explosion can be prevented by releasing static electricity generated through the member.

  Also, a multilayer aluminum laminate with a double structure or more on the inner side of the inner bag part (7) (the inner side in contact with the filler is a thermoplastic film layer such as polyethylene or PP and the outer side is an aluminum material layer or an aluminum vapor deposition layer) It is preferable that the inner layer of the multilayer aluminum laminate material or the multilayer aluminum vapor deposition material is a thermoplastic film layer such as polyethylene or PP. Further, the thickness of the inner bag portion (7) is preferably in the range of 0.1 mm to 1 mm, and if it is thinner than 0.1 mm, there is no strength and breakage during filling of the powder or transportation. In addition, the inner bag portion (7) tends to be depressurized during discharge and is difficult to discharge, and even if it is thicker than 1 mm, the effect is not changed.

  Moreover, the inner bag part can be pulled out at the time of discharge because the bottom external part (9) of the flexible container and the inner bag part (7) formed of a sealing material are not joined. Since it is easy to apply vibration to the exterior part (6) and the inner bag part (7) and the powder can be discharged more easily and in a short time, it is a preferred form as a flexible container of the present invention.

  When discharging the powder filled in the flexible container, it is suspended by a hoist or the like through a jig as shown in FIG. 1, and a bottom exterior part (9) having a chrysanthemum structure and a discharge port (2) The bottom surface portion (3), which is a double structure of the bottom surface inner exterior portion (10) provided with a rim, is opened (however, the bottom surface portion (3) is not shown in FIG. 4), and has a double structure. From the suspension belt (4) sewn on the bottom surface exterior exterior portion (9) so that the bottom surface exterior exterior portion (10) provided with the discharge port (2) is protruded outside. Loosen the fasteners 24 or 25 attached to the side belt (8) which is an extension and extends to the bottom. And at the time of discharge | emission, the heat seal made into the discharge port of the front-end | tip of an inner bag part (7) is opened, and the said powder is discharged | emitted. At this time, the four hanging belts support the flexible container in the vertical direction with an equal load, so that the weight is easily applied directly to the powder, and the discharge can be performed smoothly. In particular, even when the inner bag slips down to the outlet in the latter stage of discharging, it can be discharged smoothly.

  Discharging the powder from the flexible container at a rate of 6 kg / min to 360 kg / min is a preferred form of the method for discharging an alkali metal salt of (meth) acrylate of the present invention. More preferably, it is discharged at a rate of 10 kg / min to 200 kg / min, and more preferably at a rate of 18 kg / min to 120 kg / min.

  At this time, it is thought that shaking the flexible container hung up and down by the hanging jig has an auxiliary effect for breaking the compaction state, but excessively giving vibration will cause the powder to be tightened again. May not be right. In this state, after opening the lower end of the inner bag part (7), the binding of the discharge port binding string (25) is released to start discharging, but the inner bag part ( Expanding the folded portion at the bundling portion of 7) may be effective in improving the speed at which the powder is discharged.

  The discharge of the powder is continued promptly and continuously. However, if blocking occurs near the discharge port in the flexible container and the discharge speed of the powder is low, the inner part of the bottom surface protruding to the bottom of the flexible container This can be broken by lightly impacting the part (10) from the outside. Also, as the discharge progresses, the inner bag becomes deflated and its overall length becomes longer. To assist this, the inner bag portion (7) is pulled down and the flexible container is lifted up accordingly. The operation has the effect of improving the speed at which the packing is discharged.

  Preparation of an aqueous solution containing an alkali metal salt of (meth) acrylic acid, which is an example of a raw material of the polymerizable hygroscopic powder used in the present invention, is not particularly limited and can be used in a wide range of known and well-known operations and conditions. . For example, it is performed by gradually adding acrylic acid and / or methacrylic acid to an aqueous solution of an alkali metal hydroxide.

  It is also possible to gradually add an aqueous solution of an alkali metal hydroxide and acrylic acid and / or methacrylic acid simultaneously into water. At this time, it is desirable that the reaction kettle be sufficiently cooled and sufficiently stirred. The reaction temperature is usually preferably 0 ° C to 70 ° C. A reaction temperature of less than 0 ° C. is not suitable because it causes solidification of an aqueous solution of alkali metal hydroxide or acrylic acid and / or methacrylic acid. Also, reaction temperatures exceeding 70 ° C. are not suitable because they may cause polymerization. Usually, it is appropriate to carry out the reaction at 10 ° C to 60 ° C, preferably 20 ° C to 50 ° C. It is desirable that the reaction system is stirred so that an aqueous solution of alkali metal hydroxide or acrylic acid and / or methacrylic acid can be sufficiently brought into contact with water. During the reaction, it is desirable to carry out in the presence of air (in the presence of oxygen) in order to prevent polymerization.

  Examples of the alkali metal salt in the present invention include lithium salts, rubidium salts, and cesium salts in addition to sodium salts and potassium salts. More specifically, it is a sodium salt or a potassium salt.

A polymerization inhibitor such as hydroquinone or hydroquinone monomethyl ether may be added to the acrylic acid and / or methacrylic acid. Acrylic acid and / or alkali metal methacrylate in the step of neutralizing (meth) acrylic acid in order to obtain (meth) acrylic acid alkali metal salt as a raw material for the (meth) acrylic acid alkali metal salt powder of the present invention The concentration of the aqueous salt solution is usually 10 to 70% by weight, preferably 30 to 65% by weight. If the concentration is lower than 10% by weight, a large amount of heat is required for drying and the drying apparatus becomes large, which is not economically suitable. On the other hand, when the concentration exceeds 70% by weight, the reaction is too intense, and there is a risk that problems such as polymerization may occur. The reaction end point has a pH of about 7 to 13, preferably a pH of about 8 to 11. If the pH at the end of the reaction is less than 7, the remaining acrylic acid and / or methacrylic acid will increase and polymerization may occur during drying. On the other hand, if the pH exceeds 13, the remaining alkali metal hydroxide increases, which may cause problems such as hydrolysis in the reaction using acrylic acid and / or alkali metal methacrylate.
Thus, an acrylic acid and / or alkali metal methacrylate aqueous solution having a concentration of 30 to 65% by weight can be obtained by the reaction as described above.

  In addition, the form in which water is added in each step after the neutralization step to wash each tank and piping can prevent inadvertent polymerization of acrylic acid and / or alkali metal methacrylate and prevent clogging of piping and the like. Therefore, it is a preferred embodiment as a production form of the raw material of the powder used in the discharge method of the present invention.

  Next, the aqueous solution of acrylic acid and / or alkali metal methacrylate is brought into contact with the hot air fluid in a spray form to remove moisture and dry. The amount and temperature of the hot air fluid are appropriately changed depending on the concentration and the treatment amount of the acrylic acid and / or alkali metal methacrylate aqueous solution, but at least the water content of the dried acrylic acid and / or alkali metal methacrylate is 0.1. It is necessary to adjust so that it becomes less than%. For example, the temperature of the hot air fluid is usually 150 ° C to 250 ° C, preferably 180 ° C to 230 ° C. When the temperature of the hot air fluid exceeds 250 ° C., acrylic acid and / or alkali metal methacrylic acid salt is not preferable because it causes solid phase polymerization. When the temperature of the hot air fluid is less than 150 ° C., it becomes difficult to make the water content of acrylic acid and / or alkali metal methacrylate after drying with an economical processing amount 0.1% or less.

  Further, the (meth) acrylic acid alkali metal salt targeted by the method of filling the (meth) acrylic acid alkali metal salt powder of the present invention may be a powder or a granule. The (meth) acrylic acid alkali metal salt powder or (meth) acrylic acid alkali metal salt granule in the present invention is specifically potassium acrylate powder or potassium acrylate granule.

  In the present invention, a known apparatus can be used as the spray drying apparatus used when the (meth) acrylic acid alkali metal salt powder is produced. Any type of sprayed aqueous solution and hot-air fluid can be used, such as those in cocurrent contact, those in countercurrent contact, and types in which cocurrent contact is made after once making countercurrent contact. Moreover, as a form which sprays aqueous solution, any form of a rotating disk system and a nozzle form is employable. Air is usually sufficient as the hot air fluid, but an inert gas such as nitrogen may be used.

  Thus, a dried alkali metal salt of (meth) acrylate is obtained. Of the obtained (meth) acrylic acid alkali metal salt powder, relatively large particles are recovered from the lower part of the spray dryer, but the other particles are carried to the cyclone along with the air current, where they are separated from the exhaust gas (meta ) Alkali metal acrylate powder is recovered. It is also possible to collect using a bag filter. Moreover, the process of drying the powder obtained in the process may be included.

  The alkali metal salt metal (meth) acrylate used in the present invention can be stored in a storage tank and then filled into a flexible container, or can be used for filling the flexible container without going through the storage tank as it is. . At this time, the form of filling the flexible container with the (meth) acrylic acid alkali metal salt powder having a water content of 1000 ppm or less produced through the spray drying process using a storage filling gas having a water content of 6 g / m 3 or less. Is preferred.

  The (meth) acrylic acid alkali metal salt granules used in the present invention can be produced using a granulation apparatus. Specifically, it is produced by spraying an aqueous solution of an alkali metal (meth) acrylate with seeding particles onto an alkali metal (meth) acrylate powder together with dry air to increase the particle size. This (meth) acrylic acid alkali metal salt granule may also be produced through a drying step if necessary. Of course, in the filling method and method of use of the present invention, the powder and granules may be in a mixed state.

  In addition, as a method of transferring the (meth) acrylic acid alkali metal salt powder or (meth) acrylic acid alkali metal salt granule produced as described above to the storage tank or the flexible container, there are a belt conveyor, a bucket elevator, and a screw conveyor. Vibration conveyors and pneumatic transportation can also be used.

In the following, a preferred embodiment regarding the (meth) acrylic acid alkali metal salt powder will be described. Also during the above transfer, the water content in the carrier gas used is maintained at 6 g / m ³ (standard state) or less, similar to the water content in the storage and filling gas. Even after the transfer to the flexible container, the specific surface area of the dried (meth) acrylic acid alkali metal salt powder can be adjusted to 0.8 m ² / g or more. Therefore, it is a preferable form that the specific surface area of the dried (meth) acrylic acid alkali metal salt powder has a specific surface area of 0.8 m ² / g or more before transfer to the flexible container and filling.

  The above specific surface area is obtained by measuring the alkali metal salt powder of (meth) acrylic acid salt degassed at 150 ° C. for 60 minutes using a BET specific surface area meter. Specifically, it was measured with an automatic BET specific surface area meter manufactured by Yuasa Ionics.

In addition, the (meth) acrylic acid alkali metal salt powder used in the filling method of the (meth) acrylic acid alkali metal salt powder and the method of using the (meth) acrylic acid alkali metal salt powder of the present invention includes a water content. Is transferred using a storage filling gas of 6 g / m 3 or less, and the (meth) acrylic acid alkali metal salt powder used in the present invention is represented by the following formula (1). Retention of the specific surface area (C) of the (meth) acrylic acid alkali metal salt powder immediately after the spray drying step and the specific surface area (D) of the powder immediately before filling the flexible container of the present invention in% It is a preferred embodiment that the rate is 80% or more. More preferably, the retention is 85% or more and 90% or more.
(C) / (D) (1)
By maintaining this specific surface area, the powder can be prevented from being agglomerated even after filling the flexible container, and can be easily discharged. More preferably, also with respect to the specific surface area (D) of the powder immediately before filling the flexible container and the specific surface area (E) of the alkali metal salt of (meth) acrylate upon discharge, the following formula (2) A form in which the retention indicated by is 80% or more is more preferable. More preferably, the retention is 85% or more and 90% or more.
(D) / (E) (2)
In order to prevent further agglomeration, the specific surface area (C) of the (meth) acrylic acid alkali metal salt powder immediately after the spray drying step and the specific surface area of the (meth) acrylic acid alkali metal salt powder upon discharge As for the relationship with (E), it is more preferable that the retention represented by the following formula (3) is 80% or more. More preferably, the retention is 85% or more and 90% or more.
(C) / (E) ... (3)
That is, it is a preferable embodiment that the specific surface area of the (meth) acrylic acid alkali metal salt powder does not change so much even after the transfer operation, the filling operation, and the discharging operation after storage. Specifically, this degree of change is an index indicating that the change is less than 20% at most even if the specific surface area of the powder changes.

When the transport gas temperature during transport falls below the dew point of the hot air fluid after drying, or when the moisture content of the transport gas during transport exceeds 6 g / m ³ (standard condition), an alkali metal salt of (meth) acrylate The surface of the powder salt is liquefied and the specific surface area is less than 0.8 m ² / g, and the (meth) acrylic acid alkali metal salt powder adheres to the conveyor being transported, or the piping for pneumatic transportation is blocked. It becomes difficult to transfer.

Further, even in the storage tank, the water content of the storage filling gas in the storage tank needs to be sealed with a storage filling gas of 6 g / m ³ or less.

When the moisture content of the storage filling gas during storage exceeds 6 g / m ³ (standard state), the surface of the (meth) acrylic acid alkali metal salt powder salt is deliquescent and the specific surface area is 0.8 m ² / g. As a result, the alkali metal (meth) acrylate powder solidifies in the storage tank and cannot be filled.

  In addition, the (meth) acrylic acid alkali metal salt powder has a double bond in the molecule although it is in the form of a powder, so if it is exposed to high temperature for a long time, self-accelerated decomposition reaction such as polymerization and decomposition occurs. Raises and polymerizes. As a result, if the container is filled and stored at a high temperature, it is further stored and cannot be stored safely for a long time. Further, partial curing is not preferable as a powder raw material having a double bond. Therefore, after adjusting a predetermined moisture content, it is preferable to cool before filling.

  On the other hand, since the (meth) acrylic acid alkali metal salt powder has high hygroscopicity, the temperature of the carrier gas during transfer needs to be heated to a dew point or higher of the hot air fluid after drying. Depending on the drying conditions of the powder by the spray drying method, the moisture content in the hot air fluid contained in the powder after drying and brought from the spray dryer changes, and the dew point changes. Therefore, the powder is preferably heated to the dew point temperature under the above drying conditions. Specifically, the powder is preferably in a temperature range of 40 ° C to 100 ° C, preferably 60 ° C to 100 ° C, and more preferably 80 ° C to 100 ° C.

  In the present invention, the gas that is a medium when the powder is transferred or transported after drying is also a storage filling gas. Therefore, the amount of water contained in the storage filling gas is controlled after the drying step. The hot air fluid containing moisture brought in from the spray dryer contained in and the (meth) acrylic acid alkali metal salt powder after separation with a cyclone or the like is preferable. Specifically, by using a transfer gas supplied from another pipe during the transfer of the powder, it is possible to replace or dilute the hot air fluid accompanying the moisture and the transfer gas, Therefore, it is possible to achieve control of the amount of water contained in the storage filling gas.

  The powder coming out of the spray dryer used in the process of drying the powder contains a lot of wet gas. Therefore, when supplying this wet gas to the transport pipe, in order to limit the excess wet gas from the spray dryer main body from being mixed into the transport pipe, A form in which a rotary valve, a double damper and the like are installed is preferable. Moreover, it is preferable that dry air is introduced into the transport pipe from another side pipe or the like coupled to the transport pipe and is replaced with the dry air in the transport pipe. Preferred embodiment because the above-mentioned rotary valve, double damper, etc. can be used to adjust the supply amount of the powder coming out of the spray dryer to the transport pipe and efficiently replace it with dry air. It becomes.

  Alternatively, by heating to a temperature higher than the dew point, the relative humidity of the powder supplied from the spray dryer containing a large amount of the moist gas is lowered, and the powder is dried. Therefore, a mode in which a step of heating the temperature above the dew point is additionally provided during pneumatic transportation.

In addition, as the air transportation condition or gas transportation condition of the powder, the amount of water obtained through a process of separating and drying the solution by applying a hot air current to a solution containing an alkali metal (meth) acrylate. (Meth) acrylic acid alkali metal salt powder is 0.1% by weight or less gas transfer through the transfer pipe from the step of separating and drying to the storage tank of the powder, As the gas supplied to the transfer pipe, a gas having a dew point of 12 ° C. or lower and a temperature of 35 to 95 ° C. is used, and the linear velocity in the transfer pipe of the gas is maintained at 5 m / s or higher. Supply amount (X) of the alkali metal acrylate powder from the step of separating and drying into the transfer pipe in a range of 5 kg / hr to 150 kg / hr, supply amount of the gas into the transfer pipe (Y) the ^5m 3 / r~5000m 3 / ^hr, characterized in that the range of (meth) form to adopt a transfer method of acrylic acid alkali metal salt powders are preferred. In addition, the supply amount (X) of the (meth) acrylic acid alkali metal salt powder from the separation and drying step into the transfer pipe and the dry gas supply amount (Y) are represented by the following formulas:
(X) / (Y)
It is a more preferable mode that the transfer is performed such that the maximum powder transfer amount that can be transferred with 1 m ³ of the gas in the transfer pipe is 30 kg or less.

  In addition, if necessary, a contact drying process may be performed in which dry air is introduced into a storage tank or the like transported by the transport pipe to replace or dilute the moisture accompanying the powder. In this case, it is preferable to introduce a sufficient amount of dry air from the lowest possible portion of the storage tank to bubble the powder, and to guide the dry air after bubbling out of the tank.

  In addition, the form of supplying the dry air to the storage tank is not particularly limited, but the discharge pipe of the discharge unit having the inner and outer double structures coaxially as described in JP 2000-318839 A is applied, and The discharge unit may be provided at the bottom of the storage tank, and dry air may be supplied from the supply pipe of the discharge unit. By adopting the discharge unit in this form, the powder can be diverted in the discharge unit after the contact drying is completed, and this time the powder can be efficiently discharged from the discharge unit using the supply pressure of dry air. The storage tank can be made. By applying the discharge unit described in Japanese Patent Laid-Open No. 2000-318839, the flow dividing unit is adjusted at the time of air supply so that the contact drying air flows into the tank, and after the contact drying is completed, the flow dividing unit is adjusted. The powder can be discharged from the tank using the pressure of the dry air as described above so that the powder is guided to the discharge unit. Automatic operation is also possible by adapting this system.

At this time, the dry gas charged into the storage tank (hereinafter referred to as a tank) is represented by the following formula (A);
X ≧ 3V / T (A)
(In the formula, T is the residence time (s) of the powder in the tank, V is the volume (L) of the tank, and X is the input speed (L / s) of the dry gas.) A form that is charged to comply with the above is preferable.

  The dry gas inlet may be at the bottom of the tank, for example, a tank having a side part and an inclined bottom part in contact with the side part, that is, the lower part of the tank is conical or quadrangular from the top. In the case of a structure that is gradually narrowed downward, it is preferable that there is an outlet for the dry gas between the lowermost part of the inclined bottom part and the part where the side part and the inclined bottom part contact. More preferably, there is an outlet between the height of 2/3 where the bottom part inclined from the lowermost part contacts, and more preferably, the height of 1/3 of the part where the bottom part inclined from the lowermost part contacts. There is an exit between.

More preferably, the following formula (B);
X ≧ 5V / T (B)
Is to be put into compliance. The definitions of X, V, and T are the same as in the above formula (A).
The residence time T of the powder in the storage tank is preferably 300 seconds or longer, and preferably 864,000 seconds (10 days) or shorter. More preferably, it is 600 seconds or more, and 86400 seconds (one day) or less. More preferably, it is 1800 seconds or more and 10 hours or less. Particularly preferably, it is 1800 seconds or longer and 5 hours or shorter.

  The dry gas used for drying in the storage tank preferably has a dew point of 12 ° C. or lower. More preferably, it is 10 degrees C or less, More preferably, it is 5 degrees C or less, More preferably, it is 0 degrees C or less, More preferably, it is -8 degrees C or less, Most preferably, it is -16 degrees C or less. . Further, the temperature of the dry gas is preferably 95 ° C. or lower. More preferably, it is 80 degrees C or less, More preferably, it is 70 degrees C or less. The dry gas can be obtained using a normal dehumidifier or a drying device.

On the other hand, as described above, since the self-accelerated decomposition reaction such as polymerization and decomposition occurs when the powder is exposed at a high temperature as described above, the moisture content of the storage filling gas is 6 g / m ³ (standard). It is preferable that the temperature of the (meth) acrylic acid alkali metal salt powder is reduced to 60 ° C. or less after the (state).

For the cooling of the powder, it is preferable to use an apparatus having a cooling capacity capable of setting the temperature of the alkali metal salt of (meth) acrylate to 60 ° C. or less. Specifically, in order to efficiently cool, the hot air fluid which is a medium when the powder is transferred or transported and the (meth) acrylic acid alkali metal salt powder are separated by a cyclone or the like, and the powder The powder is cooled while cooling the surroundings of the apparatus and / or the screw itself while being transferred by a conveying apparatus such as a screw conveyor. Of course, the cooling device and the transport device are preferably replaced with a transport / transfer gas (or storage / filling gas) having a water content of 6 g / m ³ (standard state) or less during the transport and cooling. . After the powder is cooled to 60 ° C. or lower, the powder is stored in a storage container or a storage tank such as a hopper. Also at this time, it is a preferable mode to keep the storage / filling gas at a moisture content of 6 g / m ³ (standard state) or less.

  The water content of the powder is preferably 1000 ppm or less. Furthermore, 600 ppm or less is preferable. Furthermore, it is 500 ppm or less. When it exceeds 1000 ppm, even if it is the structure of the flexible container used in the present invention, solidification and agglomeration of powders are likely to proceed during storage after filling, and it becomes difficult to discharge.

  Even if the storage filling gas conditions are devised, the specific surface area immediately after spray drying and before and after filling the flexible container cannot be maintained, and the powder tends to be fooled during storage. As a result, long-term stable storage may not be realized. The term “before and after storage” means that the specific surface area of the powder immediately after spray drying of the powder and the specific surface area after storage of the flexible container are maintained. More specifically, it is preferable to satisfy the retention ratio of the specific surface area of at least one of the formulas (1), (2), and (3) described above.

  In addition, when storage is performed under the most preferable conditions, the water content of the (meth) acrylic acid alkali metal salt powder is preferably adjusted to 350 ppm or less, more preferably 300 ppm or less, and even more preferably 250 ppm or less. When the most preferable conditions are adopted, aggregation is less likely to occur and the powder can be stored more stably over a long period of time.

  In addition, the amount of water present in the gas used for transfer or storage and filling in the present invention is measured with a temperature / humidity / dew point meter (model number: SU-635) manufactured by Testo, and the temperature and relative humidity at that time. Can be determined by first converting the amount of water in the standard state. And the moisture content of the gas for conveyance is measured by inserting the probe of the said measuring apparatus in the branch piping through which the gas for conveyance used for the said transfer or transport passes.

  Moreover, the preferable average particle diameter range of the (meth) acrylic acid alkali metal salt powder used in the present invention is preferably 0.1 to 500 μm. More preferably, it is 0.5-400 micrometers. More preferably, it is 1-300 micrometers. Most preferably, it is 10-100 micrometers. When the average particle diameter is less than 0.1 μm, the powders are easily aggregated and easily consolidated in the flexible container. If it exceeds 500 μm, there may be a problem with the use conditions of the powder, for example, solubility or dispersibility in an organic solvent. More specifically, the particle size distribution measured according to the dry sieving test method of JIS K0069 “Chemical product sieving test method” of the above (meth) acrylic acid alkali metal salt powder is from 106 μm in the particle size range. The larger one is 0.1 to 0.5% by weight, the one having 106 to 74 μm is 0.5 to 5.0% by weight, the one having 74 to 53 μm is 10 to 45% by weight, the one having 53 to 32 μm is 40 to 65% A weight percentage of less than 32 μm is 10 to 30 weight%, which is a preferable range in order to satisfy a good filling property, storage property and discharging property.

  Further, when the powder used in the present invention is a (meth) acrylic acid alkali metal salt granule, the granule refers to one having an average particle size of 0.5 mm or more and 8 mm or less, more preferably 0. .5 mm or more and 5 mm or less. When the form of the (meth) acrylic acid alkali metal salt is a granular powder, the bulk specific gravity becomes small, so that the container can be filled well. (Powder can be filled with a larger weight even in the same volume.) In addition, when it is granular, it is less affected by moisture than fine powder, and agglomeration hardly occurs even after filling and storing in a container. Also, when the powder used in the present invention is an alkali metal salt of (meth) acrylate, the spray drying apparatus for manufacturing the powder is changed to a known granulating apparatus. preferable.

(Example 1)
<Neutralization reaction>
Into a reaction vessel equipped with a stirrer and jacket with an internal volume of 6 m 3, 552 kg of pure water is charged while flowing cooling water through the jacket, and 2056.6 kg of 48 wt% aqueous potassium hydroxide solution is charged with stirring. Next, 1268.2 kg of acrylic acid containing 200 ppm of methoxyhydroquinone is dropped over 4 hours. During the dropping, the dropping speed is appropriately adjusted so that the liquid temperature does not become 25 ° C. or higher. When the dropping is completed, the pH of the aqueous solution is measured, and acrylic acid or an aqueous potassium hydroxide solution is added so as to fall within the range of 8.1 to 9.5. Thus, 3876.8 kg of a 50 wt% potassium acrylate aqueous solution was obtained. The concentration of methoxyhydroquinone is 65 ppm with respect to a 50 wt% aqueous potassium acrylate solution.

<Spray drying>
Using the 50 wt% potassium acrylate aqueous solution thus obtained, spray drying was performed with a centrifugal spray dryer which was previously dried by feeding hot air into the main body.
The aqueous solution was supplied to the spray dryer so that the spray temperature was 230 ° C. and the outlet temperature was 100 ° C. The differential pressure between the cyclone inlet and outlet, which is a measure of the air volume, was 0.0025 kg / cm ² . Moreover, the rotation speed of the atomizer which is a location which atomizes the said aqueous solution with a centrifugal force was 22000 rpm.

The potassium acrylate powder obtained from the lower part of the cyclone was put into an air transport pipe using a rotary valve. In the air transport pipe, air whose water content was adjusted so that the dew point was 0 ° C. was heated to 90 ° C., and an amount of 15 m ³ / min was allowed to flow in the standard state.

Next, the powder in the pneumatic transport pipe was again separated into a powder and a carrier gas by a cyclone, and the obtained powder was put into a cooler with a screw feeder and cooled to 40 ° C. In this cooler, air (25 ° C.) having a moisture content adjusted in the same manner as the air during air transportation shown in the table below is charged at 1.5 m ³ / hr to replace the atmosphere in the cooler.

<Filling>
The bottom of the outer bag having an inner bag formed of a sealing material in the filling chamber in which the humidity is maintained at 30%. Filled 360 kg into a flat structure flexible container. The water content of the powder was 300 ppm.

<Save>
The flexible container was stored for 90 days in a cold storage controlled at a temperature of 25 ° C. During storage, FIBCs were not stacked.

<Emission test>
After 90 days, 25% humidity 60% R.D. The flexible container discharge experiment was conducted under the condition of H. When hanging the flexible container, a dedicated hanging jig as shown in FIG. 1 was used. The discharge time was measured with the time from when the discharge port at the bottom of the flexible container was opened until the powder was discharged until the powder was completely discharged until the powder ceased to be discharged. As a result, the discharge time was 20 minutes.

(Example 2)
In the same manner as in Example 1, neutralization reaction, spray drying and storage were performed.

<Filling>
Although it filled similarly to Example 1, it has become the shape which the bottom part protrudes at the time of opening which has a shape like FIGS. 5-8, and the inner bag of sealing material is also the same The flexible container which is in the form of protruding is used.

<Emission test>
In the same manner as in Example 1, a discharge test was performed using a hanging jig. The discharge time was 4 minutes and 50 seconds. It can be seen that if the hanging jig used in this case is used according to Example 1 and Example 2, the powder can be discharged efficiently even with a normal double structure flexible container, and also adopted in this case. It can be seen that when a flexible container having a specific structure is used, the discharge time can be effectively reduced.

(Example 3)
<Neutralization reaction>
A stirrer and jacketed reaction kettle having an inner volume of 6 m ^3, while flowing cooling water to the jacket was charged with pure water 1554.8Kg, stirring is charged with 48 wt% aqueous sodium hydroxide solution 1311.2Kg. Next, 1133.9 kg of acrylic acid containing 200 ppm of methoxyhydroquinone is dropped over 4 hours. During the dropping, the dropping speed is appropriately adjusted so that the liquid temperature does not become 25 ° C. or higher. When the dropping is completed, the pH of the aqueous solution is measured, and acrylic acid or a 48% sodium hydroxide aqueous solution is added so as to fall within the range of 8.1 to 9.5. Thus, 4000 kg of a 37% by weight aqueous sodium acrylate solution was obtained. The concentration of methoxyhydroquinone is 57 ppm with respect to 37% by weight sodium acrylate.

<Spray drying>
Using the thus obtained 37 wt% sodium acrylate aqueous solution, spray drying was performed with a centrifugal spray dryer which was previously dried by feeding hot air into the main body.
The aqueous solution was supplied to the spray dryer so that the spray temperature was 230 ° C. and the outlet temperature was 100 ° C. The differential pressure between the cyclone inlet and outlet, which is a measure of the air volume, was 0.0025 kg / cm2. Moreover, the rotation speed of the atomizer which is a location which atomizes the said aqueous solution with a centrifugal force was 22000 rpm.

The potassium acrylate powder obtained from the lower part of the cyclone was put into an air transport pipe using a rotary valve. In the air transport pipe, air whose water content was adjusted so that the dew point was 0 ° C. was heated to 90 ° C., and an amount of 15 m ³ / min was allowed to flow in the standard state.

Next, the powder in the pneumatic transport pipe was again separated into a powder and a carrier gas by a cyclone, and the obtained powder was put into a cooler with a screw feeder and cooled to 40 ° C. In this cooler, air (25 ° C.) having a moisture content adjusted in the same manner as the air during air transportation shown in the table below is charged at 1.5 m ³ / hr to replace the atmosphere in the cooler.

<Filling>
Filled and stored in the same manner as in Example 1, but a flexible container having an inner bag made of a sealing material and having a specific shape as shown in FIGS. The water content of the powder was 280 ppm.

<Emission test>
In the same manner as in Example 1, a discharge test was performed using a hanging jig. The discharge time was 3 minutes 30 seconds. Sodium acrylate is less affected by moisture than potassium acrylate, and the powder as a whole is less prone to unity, so the discharge rate is faster.

(Comparative Example 1)
In the same manner as in Example 1, neutralization reaction, spray drying, filling and storage were performed.

<Emission test>
In the same manner as in Example 1, an experiment for discharging the flexible container was performed after 90 days. The flexible container was lifted by one-point suspension, and the discharge test was performed without using the four-point suspension jig of this case. The discharge time was 84 minutes. In the second half of the discharge process, the inner bag began to squeeze out, and at one point, the clogging phenomenon occurred at the discharge port, and the discharge speed decreased extremely. In this case, the discharge was completed with appropriate manual work. It has been found that in the case of a flexible container that does not have a structure in which the discharge port at the bottom portion protrudes, the discharge speed is significantly reduced in the case of one point slip.

(Reference Comparative Example 2)
In the same manner as in Example 1, neutralization reaction, spray drying and storage were performed.
<Filling>
Filling was performed in the same manner as in Example 1, but this time, a flexible container having an inner bag made of a sealing material and having a shape as shown in FIGS.
<Emission test>
In the same manner as in Comparative Example 1, the flexible container was lifted by one-point hanging without using the four-point fulcrum hanging jig of the present case, and a discharge test was performed. The discharge time was 10 minutes and 20 seconds. Even in the case of a flexible container having a structure in which the bottom portion protrudes during discharging, the discharging speed is reduced in the case of one point. Compared to Example 2, it can be seen that the discharge time is shortened by about half for each one and four points.

(Comparative Example 3)
In the same manner as in Example 3, sodium acrylate was spray-dried by a neutralization reaction, and filled and stored.

<Emission test>
Similarly to the reference comparative example 2, the flexible container was lifted by one-point suspension without using the 4-point fulcrum lifting jig of the present case, and a discharge test was performed. The discharge time was 9 minutes and 10 seconds. Even in the case of sodium acrylate, the discharge time is considerably reduced as compared with Example 3. Further, since it is sodium acrylate, it is hardly affected by moisture, so that the discharge rate of the potassium acrylate of Comparative Example 2 was slightly faster.

  The hanging jig according to the present invention is adapted to a technique for efficiently discharging a powder from a flexible container bag filled with a polymerizable hygroscopic powder that easily absorbs moisture. As a result, even if a solidification phenomenon occurs in a part of the polymerizable hygroscopic powder due to a slight moisture absorption, it can be smoothly discharged. In addition, the jig can be easily used using a hoist lane or the like that is installed in accordance with the space of the stand, the site, or the workplace to be used. In addition, since it is supported by a plurality of fulcrums, the stability of the flexible container bag can be maintained when it is suspended, as compared with one point where the load is concentrated on one point.

It is an example of the jig | tool used with the discharge | emission method of the powder concerning this invention, and the four axis | shafts extended radially from the said suspension jig | tool center part are the support rod shape. Specifically, the shape of the support bar is a reinforcing rib structure and has a square shape. An example of the method for discharging powder according to the present invention shows a state in which a flexible container bag is suspended on a support rod having four axes extending radially from the center of the hanging jig. The extended portion 4 of the suspension belt 8 is joined in a loop shape at the top, and this one loop is suspended from two hooks of a suspension jig. In an example of a jig used in the method for discharging powder according to the present invention, the jig is one of a plate shape, a square shape and a well shape, and a plate shape is used, The state which suspended the flexible container bag is shown. It is the state of the flexible container bag which became the reverse eggplant shape by the conventional one-point method. In this state, it is difficult for the inner bag to stick out from the discharge port in the later stage of discharge, and the powder is easily clogged at the discharge port. It is the flexible container bag of the double structure used by this invention. It is the figure which looked at the flexible container bag used by this invention from the top. The extension portions 4 of the two suspension belts 8 are joined in a loop shape on the upper surface portion, and the one loop extension portion 4 is suspended from two hooks of a suspension jig. It is the figure which looked at the state where the flexible container bag used by this invention was closed from the bottom. The suspension belt 4 is extended and sewn also on the bottom outer bag portion 9 of the bottom portion shown in this figure, and is closed using a discharge port rope 24 and a lower protection rope 25 as a discharge port binding string. State. The bottom part of the flexible container bag used by this invention is opened, and the bottom face part interior interior part 10 and the discharged state are shown. Further, the discharge port rope 24 and the lower protection rope 25 as the discharge port binding string are connected to an extension portion to the bottom surface portion of the hanging belt 4 via a connection portion. Loosen the outlet binding string when opening. It is the schematic which showed the angle which the hook of a hanging jig and the side part belt of the said flexible container bag can form in the state where the flexible container bag used by this invention was suspended. However, the angle indicated by the straight lines is not necessarily an accurate angle. It is an enlarged view of the edge part in the hanging jig | tool of the reinforcement rib structure shown in FIG.

Explanation of symbols

1: Filling port 2: Discharging port 3: Bottom portion (not shown)
4: Suspension belt 5: Side part 6: Exterior part 7: Inner bag part 8: Side part belt 9: Bottom part external exterior part 10: Bottom internal exterior part 11: Periphery 20: Tie for input port 21: Input port Chrysanthemum 22: Input port Chrysanthemum rope 23: Tie for discharge port binding 24: Drainage rope 25: Lower protection rope 100: Square rectangular suspension jig 101: Upper hook 102 for suspension jig: Reinforcement rib 103: Reinforcement Bar 104: Hook 105: Reinforcement rib flat surface (surface)
106: Elevation reinforcing rib 107: Loop jig 108: Reinforcing plate

Claims (9)

A top surface portion having a filling port (1), a bottom surface portion (3) having a discharge port (2), filled with a polymerizable hygroscopic powder having a CRH of 60% or less and a water content of 2000 ppm or less, at least 4 An exterior part (6) having a side part (5) in which a plurality of suspension belts (4) are sewn, and an inner bag part (7) formed of a sealing material inside the exterior part (6) The polymerizable hygroscopic powder is discharged from the flexible container bag formed from the above, and a lifting hook is provided at each protruding end of four or more axes extending radially from the center of the hanging jig. A suspension jig having a suspension container is used, the suspension belt (4) of the flexible container bag is suspended from the lifting hook, and the flexible container bag is loaded in the vertical direction by the suspension belt (4). The polymerizable hygroscopic powder is discharged from the discharge port in the bottom of the flexible container bag after being lifted so as to be supported by four or more fulcrums. Method. Each of the protrusions at a position where a plurality of axial lines extending in a radial manner from the center of each hanging jig intersect with each shape member is any one of a plate shape, a square shape and a well shape. The method for discharging polymerizable hygroscopic powder according to claim 1, wherein a lifting jig having the lifting hook is used. The hanging jig is
Four or more axes extending radially from the center of the suspension jig are in the shape of a support rod, the support rod is arranged in the horizontal plane direction of the jig, and is lifted at each protruding end of each support rod The method for discharging a polymerizable hygroscopic powder according to claim 1, wherein a hanging jig provided with a hook is used. When the flexible container bag is suspended and the bottom surface (3) and the discharge port (2) are closed, the flexible container bag is provided when the flexible container bag is viewed from the bottom surface (3). An extension of the side surface belt (8) sewn to the side surface portion (5) of the suspended belt (4) to the bottom surface portion is also sewn to the bottom surface exterior exterior portion (9). The outlet binding string passing portion installed in the extension portion of the side surface belt (8) so that the extension portion of the belt (8) to the bottom surface portion intersects at the center point of the bottom surface portion (3). A method for discharging a polymerizable hygroscopic powder according to any one of claims 1 to 3, wherein a flexible container bag is used which is closed by a discharge port binding string. The side portion (5) of the exterior portion (6) of the flexible container bag is an extension of the suspension belt (4) in a direction parallel to the direction of gravity when the flexible container bag is suspended. A side belt (8) is sewn to the side (5)
Further, the bottom surface portion (3) of the exterior portion (6) is provided with a bottom surface external exterior portion (9) that becomes a chrysanthemum structure when opened for discharging the powder, and a discharge port (2). When the flexible container bag is hung by the hanging jig, the discharge port (2) can be protruded outside by its own weight of the powder as a filler when the bottom container portion (10) is provided. In addition, a flexible container bag is used in which the bottom surface external exterior portion (9) and the bottom surface internal exterior portion (10) are sewn around the joint (11) of the bottom surface portion (3) and the side surface portion (5). The method for discharging the polymerizable hygroscopic powder according to claim 1. The polymerizable hygroscopic powder filled in the flexible container bag is a (meth) acrylic acid alkali metal salt, and the (meth) acrylic acid alkali metal salt is used at 150 ° C. using nitrogen as an adsorption gas. 60 minutes degassed the powder the specific surface area measured using the BET specific surface area ^meter, in the state of 0.8m ² /g~2.5m 2 / g, polymerization of the claim 1 to 5 How to discharge hygroscopic powder. The polymerizable hygroscopic powder according to claim 1, wherein the polymerizable hygroscopic powder is discharged at a discharge rate of 6 kg / min to 360 kg / min when the capacity of the flexible container bag is 200 L to 2000 L. Discharge method. The alkali metal salt of (meth) acrylic acid, which is a polymerizable hygroscopic powder having a CRH of 60% or less filled in the flexible container bag, is produced through a spray drying process, and further includes a moisture content. The (meth) acrylic acid alkali metal salt powder having a water content of 1000 ppm or less is transferred using a storage and filling gas having a water content of 6 g / m ³ or less and filled in the flexible container bag. 8. A method for discharging the polymerizable hygroscopic powder according to 7. The method for discharging a polymerizable hygroscopic powder according to claim 1, wherein the sealing material forming the inner bag part (7) is an aluminum laminate material or an aluminum vapor deposition material.

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