JP6443702B2 - Method for manufacturing slurry-like coating material and method for reinforcing structure to be reinforced - Google Patents

Description

  The present invention relates to a repair / strengthening member for wall surfaces, ceilings, floors, rooftops, and the like inside and outside buildings, a method for manufacturing a slurry-like coating material for repair / strengthening, and a method for reinforcing a reinforced structure using this coating material. Is.

A glass fiber chopped strand is mixed and dispersed as a reinforcing material in a plastic liquid before solidification, for example, an acrylic paint or a urethane paint to form a reinforcing film (Patent Documents 1 and 2, etc.).
Glass fiber chopped strands were spun into 10 μm and each fiberglass multifilament with a number of filaments of 200 to 1,000, etc. was applied with a bundling agent, wound around a roll, and pulled out from the roll It is made by cutting a glass fiber multifilament into a length of 15 mm. Therefore, as for the glass single fiber which comprises one piece of glass fiber chopped strand, the glass single fiber for the number of filaments which comprise one strand is mutually fixed integrally by the sizing agent.
As a result, the contact area between the glass monofilament and the paint cannot be increased, and sufficient integration between the glass monofilament and the paint is not achieved. Especially in the case of the coating film, the reinforcing layer cannot be so thick, so that sufficient reinforcement is obtained. I can't. Moreover, the unevenness | corrugation by a glass fiber chopped strand piece remains in the coating-film surface after solidification, and its appearance is not good. In addition, since the coating film itself lacks flexibility, it also lacks the ability to follow delicate irregularities on the surface of the surface to be reinforced such as concrete. Also in this respect, the integrity with respect to the surface to be reinforced, that is, the reinforcing function by the coating film was insufficient.
The present applicant has been aware of this problem from an early stage, and in order to cope with this problem, the glass fiber chopped strand is immersed in an organic solvent such as toluene or styrene, thereby removing the sizing agent from the glass fiber chopped strand and removing the glass single unit. The technique which makes a fiber and mixes and disperse | distributes this to a coating material is proposed (patent document 3).
In addition, the cement slurry which makes a glass single fiber by removing a sizing agent from a glass fiber chopped strand, and uses this as a reinforcing material is also proposed (patent document 4).

JP-A-1-218666 Japanese Patent Laid-Open No. 2004-27221 JP 2001-89265 A JP 52-049236 A

In the prior art, the sizing agent is removed from the glass fiber chopped strand by immersing the glass fiber chopped strand in an organic solvent (if necessary, stirring) as described in Patent Document 2 or 3. By soaking, the sizing agent is dissolved in an organic solvent, and the sizing agent can be almost completely removed from the glass fiber chopped strand.
However, even if the sizing agent is removed from the glass fiber chopped strand by immersion in an organic solvent, the sizing agent is not completely separated into single glass fibers by simply removing the sizing agent by immersion in an organic solvent. The glass monofilaments are partially stuck or entangled with each other, and even have a hairball shape.
Adhesion / entanglement or pill-like glass monofilaments mixed with acrylic or urethane paints will adhere to glass monofilaments in coated films after being applied to reinforced objects such as deteriorated concrete structures ( The film strength is still insufficient. In addition, it cannot be said that the glass monofilaments are completely made one by one, so the flexibility of the coating film is insufficient, and as a result, it cannot follow the delicate irregularities on the surface of the deteriorated concrete structure, and the deteriorated concrete structure The desired reinforcement with a glass monofilament-containing coating film on an object to be reinforced such as an object could not be performed.

  The present inventor has said that the glass fiber chopped strands are immersed in an organic solvent and the sizing agent is removed from the glass fiber, and the remaining glass fiber is partially stuck and entangled between the glass fibers, thereby reinforcing the reinforcing object such as deteriorated concrete. As a result of ascertaining the main cause of the failure of the glass fiber and intensive investigations, the glass fiber chopped strands from which the sizing agent has been removed are substantially completely eliminated from the sticking / entanglement between the glass single fibers remaining in the glass single fiber. The present invention has been achieved by succeeding in completely opening each single fiber.

The present invention relates to a method for producing a slurry-like coating material in which a single glass fiber is dispersed in a liquid coating material , and the liquid coating material in the liquid coating tank is moved upward at the center of the bottom portion at the coating liquid surface. and stirred to form a circulating flow toward the outer periphery, the liquid of the liquid coating material of the glass filaments is in a stirred while scraping glass filaments from glass filaments mass or single glass fiber bundles became bulk or bundle adhered to the surface by agitation of the glass filaments attached to the liquid surface of the liquid coating material liquid coating material is a method of dispersing in the liquid coating material.

In the present invention, the glass single fiber bundle is scraped off from the glass single fiber lump or glass single fiber bundle in which the glass single fibers are in the form of a lump or bundle, and the glass single fiber bundle is opened to apply the liquid glass monofilament. It is better to adhere to the liquid surface of the material.
In addition, the liquid coating material being stirred is circulated in the circumferential direction in the liquid coating material tank, and forms a flow from the center toward the outer peripheral portion at the coating material liquid surface and toward the bottom portion at the outer peripheral portion. It is preferable to circulate in the air.
Furthermore, the viscosity of the liquid coating material may be 20,000 mPa · s to 80,000 mPa · s. Moreover, even if the thickness of a glass single fiber is 3 micrometers-30 micrometers, it is applicable.

  The reinforcing method of the structure to be reinforced according to the present invention is a method in which the slurry-like coating material manufactured by the above method is applied to the surface of the structure to be reinforced and solidified.

In the manufacturing method of the slurry-like coating material of this invention, the glass single fiber is scraped off from the glass single fiber lump or the glass single fiber bundle in which the glass single fibers are formed in the shape of a lump or bundle, and the fibers are substantially opened one by one. The obtained glass monofilament is obtained and directed to the liquid surface of the liquid coating material being stirred. The single glass fibers that have been opened one by one can be adhered and trapped in the liquid coating material at the liquid level , and dispersed efficiently and uniformly in the liquid coating material by stirring. Can be prepared.

  According to this invention, the glass single fiber mixed and dispersed in the liquid coating material is mixed into a liquid coating material such as a polyurethane coating material in a state where the glass fibers are substantially completely separated one by one. Therefore, the maximum contact area between individual glass single fibers and liquid coating material can be obtained, and the maximum unity with the glass single fibers when solidified as a coating film can be obtained. The flexibility of the coating film is not impaired while obtaining the expected increase in strength. Therefore, the coating film can be brought into close contact with the surface of the reinforced object following the unevenness of the surface of the reinforced object such as deteriorated concrete, and the maximum reinforcing effect can be obtained by the coating film.

FIG. 1 is a side view showing, in partial cross section, the outline of the slurry-like coating material manufacturing apparatus of the present invention. FIG. 2 is a schematic plan view of the slurry coating material manufacturing apparatus of the present invention. FIG. 3 is a perspective view schematically showing a glass single fiber lump supply and fiber opening mechanism portion from the supply tube to the fiber opening device of the present invention. FIG. 4 is a cross-sectional view schematically showing a portion from the lower part of the supply tube of the present invention to the fiber opening device. FIG. 5 is a plan view of first and second rotating bodies constituting the fiber-spreading apparatus in FIG. FIG. 6 is an enlarged view of the cooperating portion of the first and second rotating bodies in FIG. 4, and is an extremely schematic explanation of the opening operation in the present invention. FIG. 7 is a cross-sectional view of a cartridge-type glass single fiber lump supply device. FIG. 8 is a plan view of a cartridge-type glass single fiber lump supply device.

The present invention is particularly related to the above-mentioned Patent Document 3 related to the same applicant. In the technique of Patent Document 3, a material obtained by removing a spinning sizing agent from a glass fiber chopped strand with a solvent is dispersed and mixed in a liquid coating material to obtain a slurry-like coating material for repairing the surface of a building.
Although the chopped strand is cut to a length of 3 mm to 20 mm, since the sizing agent applied directly under the spinning nozzle during the spinning process of the glass fiber filament remains as it is, one piece of the chopped strand has a rigid rod shape. The state is exhibited. If it remains in the form of a rigid rod, the surface of the coating will not be smooth, and this is not suitable for forming a thin reinforcing coating on the surface of the object to be repaired on the surface of the building. The sizing agent was removed by processing, and this was mixed and dispersed with the coating material to form a slurry-like coating material.
By removing the sizing agent, the rigidity of the chopped strand is considerably weakened, but the partial sticking / entanglement between the glass single fibers remains, and the single glass single fibers are completely separated from each other. Do not mean. As a result of intensive studies by the inventor for more ideal building repairs, partial sticking / entanglement between glass fibers from which the sizing agent has been removed is substantially completely removed, and the fibers are opened into one by one. The present invention clarifies what is necessary in order to exert an ideal reinforcing effect by a coating film obtained by mixing this with a liquid coating material and applying a slurry-like coating material in which a single glass fiber is dispersed. Has been reached.

As the liquid coating material in the present invention, an acrylic or urethane coating material is preferable, and these coating materials exhibit a viscous property, and the optimum viscosity is around 50,000 mPa · s, and is mentioned as a preferable range. 20,000 mPa · s to 80,000 mPa · s.
In this embodiment, the single glass fibers after removal of the sizing agent are opened so as to be substantially one by one, and the flow of the opened single glass fibers is directed to the liquid surface of the liquid coating material being stirred. The glass monofilament is adhered and trapped on the liquid surface of the coating material by its adhesiveness, and the glass monofilament is mixed and dispersed in the coating material by stirring the coating material to obtain a slurry-like coating material.

  1 to 3 schematically show an entire apparatus for carrying out the method for preparing a slurry-like coating material according to the present embodiment, and 10 contains a liquid coating material such as an acrylic coating material or a urethane coating material. Liquid coating tank 11, 11 is a sensor for monitoring the level of the liquid coating material, 12 is a stirring means for the liquid coating material in the liquid coating tank 10, 13 is a support column, and 14 is a sizing agent remover used in the opening process. An intermediate supply cylinder of the glass single fiber lump after the treatment, 15 is a fiber single fiber opening device, and 16 is a glass single fiber lump pressing cylinder. A rotating cartridge type fiber lump supply device 17 is disposed above the glass single fiber lump supply cylinder 14. The configuration of the rotary cartridge type fiber lump supply device 17 will be described later.

The stirring means 12 stirs a liquid coating material such as an acrylic coating material or a urethane coating material contained in the liquid coating tank 10, and includes a rotating shaft 12-1 and a rotating blade 12-2, and rotates. The shaft 12-1 is belt-connected to a rotation drive motor (not shown). The rotary blade 12-2 is shown as an axial flow screw type of two blades.
As shown by the arrows in the liquid coating tank 10 in FIG. 1, the liquid coating material accommodated in the liquid coating tank 10 moves upward from the center of the bottom, from the coating liquid surface to the outer periphery, and toward the bottom at the outer periphery, 2 constitutes a circulating flow of the coating material circulating in the longitudinal direction and the radial direction (of course also in the circumferential direction). And, as will be described later, the glass monofilament sprayed on the liquid surface of the coating material and adhered by its viscosity is uniformly mixed and dispersed with the liquid coating material, and the glass monofilament is evenly dispersed in the liquid coating material to form a slurry. It can be a coating material.
Instead of two blades, a three-blade axial flow screw may be used, and anchor blades and ribbon blades are also used as suitable for viscous liquid coating materials such as acrylic coating materials and urethane coating materials. be able to. The rotation speed of the rotary blade 12-2 is about 300 to 1,400 rotations / minute, but if the slurry is 1,000 rotations / minute on the central axis, the rotation is reduced to 150 rotations / minute on the outer periphery.

Figure 4 is filled in the supply cylinder 14, a single glass fiber mass after dipping and drying the glass fiber chopped strands in a solvent to remove the spinning sizing agent was opened by opening device 15, the liquid of the liquid coating material The configuration of the present invention for attaching to a surface is schematically shown.
In this embodiment, the glass fiber chopped strand is obtained by cutting a glass fiber multifilament having 200 filaments and a single filament diameter of 10 μm into a length of 13 mm. The multifilament from the spinning nozzle is given a sizing agent just below the spinning nozzle, so that the individual glass single fibers constituting one piece of chopped strand are glued together, and the chopped strand has no flexibility at all. It is of the nature.
In order to make individual glass single fibers from the chopped strands, the chopped strands are immersed in a solvent such as toluene as described in Patent Document 3. Then, the sizing agent component is dissolved in the solvent from the chopped strand, and the sizing agent can be substantially completely removed from the chopped strand. Even in this state, the flexibility of individual glass single fibers having a single filament diameter of 10 μm is manifested, and as disclosed in Patent Document 3, it is dispersed in a urethane-based coating material to form a slurry, which makes it possible to form an uneven surface such as concrete. It is possible to construct a glass fiber reinforced film that follows an uneven surface when applied.
However, only by immersing the chopped strands in the solvent, the partial agglutination / entanglement between the single glass fibers always remains, and the partial agglutination / entanglement between the single glass fibers exhibits a hairball shape in an extreme case. However, the single glass fibers from which the spinning sizing agent has been removed are not completely separated from each other.
In the present embodiment, the glass single fibers after removal of the solvent from the chopped strands are opened by the configuration shown in FIG. 4 so as to be substantially completely one by one, and the opened glass single fibers are coated. It is intended to prepare a more ideal slurry state by evenly dispersing in.

In more detail, the opening method and the supplying method of the opened glass monofilament to the coating liquid surface according to the present embodiment will be described. In FIG. The glass single fiber after melt | dissolving is accommodated. The glass monofilaments are filled in the supply cylinder 14 in the form of a lump (a glass monofilament lump is represented by G) or a bundle. The glass single fiber lump in the supply cylinder 14 is filled in about 4 liters with a weight of 0.6 kg to 0.8 kg. Further, for continuous supply of the glass monofilament lump, a pressing cylinder 16 (FIG. 3) is installed on the upper end side of the supply tube 14 as a pressurizing device for supplying glass monofilament lump such as a piston described later.
The fiber opening device 15 in FIG. 4 is installed below the supply cylinder 14, and obliquely below the first rotating body 18 (fiber bundle scraping member of the present embodiment) located on the upper side and the first rotating body 18. And a second rotating body 20 (fiber bundle engaging member of the present embodiment).
As shown in FIG. 5, the first rotating body 18 has a number of discs 18-2 on a rotating shaft 18-1, which are not shown in the figure and are not shown in FIG. A key groove 18-2A is provided), a spacer 18-3 is inserted between adjacent disks 18-2, and a predetermined gap 18-4 is provided between adjacent disks 18-2. To be left behind.
The alternate arrangement of the disk 18-2 and the spacer 18-3 on the rotating shaft 18-1 is fastened by screw-type fasteners 18-6 and 18-8 from both ends, so that the first rotating body 18 is obtained. Assembled. As shown in FIG. 4, the individual disks 18-2 are provided with projections 18-2B at equal intervals in the circumferential direction on the outer periphery, and the projections 18-2B are front surfaces 18-2B ′ in the rotation direction (arrow a). Extends to the tip 18-2C while being smoothly curved.
Since the first rotating body 18 has a large number of discs 18-2 spaced apart on the rotating shaft 18-1 in the axial direction, the protrusion 18-2B is spaced not only in the circumferential direction but also in the axial direction. In other words, the first rotating body 18 includes a row of circumferentially and axially protruding portions 18-2B on the outer peripheral surface thereof.
Here, the rotation direction a of the first rotating body 18 is the clockwise direction of FIG. 4 and functionally, the glass single fibers are scraped in a bundle form from the glass single fiber lump of the supply tube 14 as described later. This is the direction in which the single glass fiber bundle is transferred toward the second rotating body 20 in the supply cylinder 14.

The structure of the second rotating body 20 is basically the same as that of the first rotating body 18, and as shown in FIG. 5, a large number of disks 20-2 are arranged on the rotating shaft 20-1 (key grooves are shown in FIG. 4). 20-2A), a spacer 20-3 is inserted between adjacent disks 20-2, and a predetermined gap 20-4 is provided between adjacent disks 20-2. Is configured to remain. As shown in FIG. 4, the individual disks 20-2 are provided with protrusions 20-2B on the outer periphery at equal intervals in the circumferential direction.
The protrusion 20-2B of the disk 20-2 of the second rotating body 20 is different in shape from the protrusion 18-2b of the disk 18-2 of the first rotating body 18, and the front and rear surfaces in the rotational direction are almost symmetrical. However, a recess 20-2D is formed slightly on the inner diameter side of the tip 20-2C of the protrusion 20-2B on the front surface in the rotation direction (arrow b).
Here, the rotation direction b of the second rotating body 20 is the counterclockwise direction of FIG. 4 (the direction opposite to the rotating direction a of the first rotating body 18), and the glass single fiber bundle carried by the first rotating body 18. Is opened, and the opened glass single fiber is sprayed onto the coating material liquid surface under centrifugal force.
Similar to the first rotator 18, the second rotator 20 has a large number of discs 20-2 spaced apart on the rotating shaft 20-1 in the axial direction. In addition to being arranged in the axial direction as well, in other words, the second rotating body 20 as well as the first rotating body 18 has a row of circumferentially and axially protruding portions 20-2B on its outer peripheral surface. To prepare.
As shown in FIG. 4, the second rotating body 20 is disposed obliquely below in the vicinity of the first rotating body 18. Then, as shown in FIG. 5, the protruding portion 20-2B of the disk 20-2 of the second rotating body 20 extends into the gap 18-4 between the adjacent disks 18-2 of the first rotating body 18, and reversely Further, the protrusion 18-2B of the disk 18-2 of the first rotating body 18 extends into the gap 20-4 between the adjacent disks 20-2 of the second rotating body 20, in other words, the first rotation. The disk 18-2 of the body 18 and the disk 20-2 of the second rotating body 20 are positioned so that the protrusions 18-2B and 20-2B alternately protrude toward the other party along the axial direction.
As shown in the enlarged view of part A of FIG. 5, a gap (axial gap) δ is left between the opposing surfaces of the disks 18-1 and 20-1 between the first rotating body 18 and the second rotating body 20, and this shaft The size of the direction gap δ is 0.03 to 0.06 mm, and as described in the opening action described later, the glass monofilament passes through the axial gap δ during opening, and the first Due to the large speed difference between the rotator 18 and the second rotator 20, the single glass fibers are strongly opened in the axial gap δ, and the single glass fibers are released from sticking and entanglement. To be opened.
On the other hand, between the tip 18-2C of the protrusion 18-2B of the first rotating body 18 and the opposing surface (spacer 20-3) of the second rotating body 20 and the tip of the protruding part 20-2B of the second rotating body 20. The space between 18-2C and the opposing surface (spacer 18-3) of the first rotating body 18 is non-contact because of the mutual rotation of the first and second rotating bodies 18 and 20, and the gap is evenly about 0.5 mm. Is set.

FIG. 3 schematically shows the driving units of the first rotating body 18 and the second rotating body 20, and the driven pulley 22 is rotated by the belt 23 and driven by the end of the rotating shaft 18-1 of the first rotating body 18. 24 is connected to a driving pulley 25 on the upper side. The rotary drive shaft 24 is connected to a first rotary body drive motor of a rotational speed controllable type such as an inverter type not shown. On the other hand, the rotating shaft 20-1 of the second rotating body 20 is also connected to a second rotating body drive motor (installed in the box 26) that can control the number of rotations, such as an inverter type, not shown.
By the independent driving of the first and second rotating bodies 18 and 20, an intended rotational speed difference between the rotating bodies 18 and 20 (the rotational speed of the first rotating body 18 << the rotational speed of the second rotating body 20) is appropriately obtained. To be done. The rotational speed difference between the first rotator 18 and the second rotator 20 is, for example, when the first rotator 18 is 50 to 130 rev / min and the second rotator 20 is 1,500 to 3,000 rev / min. The speed ratio is about 20-30. The rotational speeds of the first rotating body 18 and the second rotating body 20 need to be finely adjusted for the desired opening, and such an independent drive configuration is suitable.

Next, the fiber opening operation by the fiber opening device 15 will be described. The glass monofilaments are packed into the supply cylinder 14 in a lump shape. The first rotating body 18 rotates in the direction of arrow a in FIG. 4, and this rotating direction a acts on the lower surface of the fiber mass G filled in the supply cylinder 14 and scrapes the fiber bundle from the lower surface of the fiber mass G.
The scraped fiber bundle is supplied toward the second rotating body 20 at the bottom of the supply cylinder 14 (without spilling out from the supply cylinder 14). That is, the rotation direction front surface 18-2B ′ of the protrusion 18-2B of the disk 18-2 constituting the first rotating body 18 is curved in the direction opposite to the rotation direction. When engaging the lump G, the glass single fibers are scraped into a bundle shape, and the glass single fiber bundle is rotated second in the direction of the arrow a along the bottom surface of the supply tube 14 while being engaged with the protrusion 18-2B. It is transferred in the direction of the body 20.
As described with reference to FIG. 5, the first rotating body 18 and the second rotating body 20 are in a positional relationship in which the protrusions 18-2B and 20-2B of the wheels 18-2 and 20-2 enter each other. Yes, the glass monofilament bundle scraped by engaging with the protrusion 18-2B of the wheel 18-2 of the first rotating body 18 is a gap 18 between the adjacent wheels 18-2 of the first rotating body 18. -4 engages with the protrusion 20-2B of the second rotating body 20 that rotates (in the direction of arrow b).
Because of the large speed difference between the protrusion 18-2B and the protrusion 20-2B due to the high speed of the second rotor relative to the first rotor 18, the fiber bundle held by the protrusion 18-2B of the first rotor 18 is not a gap. Receiving a strong fiber opening action due to the engagement with the protrusion 20-2B of the second rotating body 20 that successively enters the portion 20-4, the sticking / entanglement between the glass single fibers in the fiber bundle is released, Glass single fibers are opened one by one.
The unfolded glass single fiber is ejected in the direction of the tangential line as indicated by an arrow F while being scattered by the centrifugal force of the second rotating body 20 rotating at high speed, and directed to the coating liquid surface P of the liquid coating material. By being sprayed on the coating material liquid surface , it is stuck by its viscosity.
Since the liquid coating material is agitated by the stirring blade 12-2 as described above, the glass single fiber adhered to the coating liquid surface is uniformly mixed and dispersed with the liquid coating material, and the glass single fiber is dispersed. It can be dispersed uniformly in the liquid coating material to form a slurry-like coating material.

  The coating material liquid surface P in the liquid coating material tank 10 cannot be contacted with the opening device 15, but if it is too far away, the speed of the opened glass single fiber flow F from the opening device 15 decreases. However, it is necessary to maintain the optimum liquid surface position unfavorably. Therefore, a sensor 11 for monitoring the coating material liquid level P is installed (see FIG. 1).

FIG. 6 is an extremely schematic view showing the above-described opening action by the opening apparatus 15 so as to be more easily understood. A fiber bundle that has been scraped and held by the protrusion 18-2B of the first rotating body 18 from the glass single fiber lump after dissolution and removal of the sizing agent, and is carried at a low speed a to the site of association with the second rotating body 20. Is denoted by f. Even if the sizing agent is dissolved and removed, partial sticking or entanglement remains in the fiber bundle f, and it is not completely separated into one.
The protrusion 20-2B of the second rotating body 20 enters the narrow gap 18-4 (FIG. 5) between the protrusions 18-2B at high speed b (the protrusion 18-2B of the first rotating body 18 is the protrusion 20). 2B), the protrusion 20-2B that rotates at high speed to the fiber bundle f held by the protrusion 18-2B, and especially the concave portion 20-2D on the front surface in the rotation direction. Combined. Due to the overwhelming speed difference of the protrusion 20-2B with respect to the protrusion 18-2B, the fiber bundle f held by one protrusion 18-2B is engaged with the protrusion 20-2B rotating one after another.
In this way, the next to the next engagement of the protrusion 20-2B with respect to the fiber bundle f held in one protrusion 18-2B generated in the gap between the protrusions 18-2B and 20-2B is between the opposing surfaces. Since the gap δ is narrow, it becomes a strong fiber opening action on the fiber bundle f held by one protrusion 18-2B, and finally the glass single fiber f ′ completely separated into one piece. It becomes.
When leaving the projection 20-2B, the flow F of the fully-opened glass single fiber is directed toward the liquid coating material surface P while being scattered by the centrifugal force of the second rotating body 20.

Since the protrusions 18-2B in the first rotating body 18 and the protrusions 20-2B in the second rotating body 20 are configured as a circumferential direction and an axial row, the fiber mass from the supply cylinder 14 is completely opened. The opening action by the device 15 can be applied. That is, as shown in FIG. 3, the upper end of the supply cylinder 14 has a circular cross section, but the lower end has a rectangular cross section. The body 18 and the second rotating body 20 achieve the fiber lump scraping function and the fiber opening function, and the axial lengths of the installed portions of the disks 18-2 and 20-2 are that of the supply cylinder 14 along the axial direction of the fiber opening device. It is based on the width.
As shown in FIG. 4, the side surface 14-1 on the second rotating body 20 side of the supply cylinder 14 is bent toward the first rotating body 18, and the meeting portion between the first rotating body 18 and the second rotating body 20 is A narrow throat portion 21 is formed, and the second rotating body 20 is positioned below the throat portion 21. Therefore, after the glass single fiber lump in the supply cylinder 14 is scraped by the first rotating body 18, the glass single fiber lump is efficiently delivered to the second rotating body 20, opened, and directed toward the coating material surface. A high-speed flow F (FIGS. 4 and 6) of the glass single fiber to be opened is formed.

  Depending on the rotational speed difference between the first rotating body 18 and the second rotating body 20, the processing speed depends on the rotating speed of the first rotating body 18, and the fiber opening efficiency is the second rotating body 20 with respect to the first rotating body 18. Depends on the speed ratio. However, since an excessive speed ratio is concerned about excessive damage to the fiber, it is necessary to appropriately determine the desired processing speed and fiber opening. When the density of the single glass fiber mass (fiber mass weight / volume) in the supply cylinder 14 is 0.2, the speed of the first rotating body 18 is about 100 rev / min, and the speed of the second rotating body 20 is about 2, It was generally appropriate to set it to 500 rev / min.

  As described above, the glass single fiber opened one by one by the opening device 15 is subjected to the centrifugal force due to the high-speed rotation of the second rotating body 20, and the coating material liquid surface as indicated by the arrow F in FIGS. It is sprayed on P. Since the coating material has a viscous property of about 50,000 mPa · s, the coating material is trapped under the viscosity of the coating liquid surface, and the coating material is longitudinally mixed by a stirring blade 12-2 as shown in FIG. Since it is subjected to stirring in the direction and the rotation direction, the glass monofilament can be uniformly dispersed in the coating material to obtain a slurry-like coating material.

Next, a glass single fiber introducing device for the supply cylinder 14 will be described. The weight ratio of the glass single fiber in the slurry-like coating material is preferably as large as possible from the viewpoint of reinforcement. From the viewpoint of paintability (efficiency of painting work) to the repair structure, a very large weight ratio will impair this, and 0.5 to 10% is appropriate. On the other hand, the liquid coating material tank 10 is about the size of a normal drum can (200 liters) and can accommodate about 150 kg of coating material.
Therefore, the single glass fiber to be supplied and mixed in the liquid coating material tank 10 in one batch is 1.5 kg to 15 kg. However, the glass single fiber lump after removal of the sizing agent has a fluffy and bulky property, and even if compressed considerably, it only weighs about 200 g per liter, and should be supplied to the liquid coating material tank 10. The volume of the glass single fiber lump becomes 7.5 to 75 liters, and an efficient introduction method of the light but fluffy and bulky glass single fiber lump is required.
The rotating cartridge type fiber lump supply device 17 can achieve this requirement, and the configuration thereof will be described below. Rotating cartridge type fiber lump supply device 17 is a glass single fiber lump after removal of sizing agent filled from each cartridge 30 (the dimensions are, for example, 100 mmφ, length 50 cm, volume is about 4 liters). The fiber lump supply device 17 itself can be moved up and down in FIG. 1 by a lifting rotary motor 32.
The lifting rotary motor 32 is provided on the lifting platform 34, and the lifting platform 34 is connected to the machine frame assembly 35 of the fiber lump supply device 17, but between the lifting platform 34 and the guide rod 33 (attached to the column 13). Is provided with a longitudinal sliding portion (not shown) composed of longitudinal grooves and longitudinal projections. Further, a rotary motion / vertical motion conversion means is provided such that a gear (not shown) coupled to the rotary shaft of the motor 32 engages with a rack (not shown) provided on the lifting platform 34. The fiber lump supply device 17 can be appropriately moved up and down along the support column 13 by the rotation.
As shown in FIGS. 7 and 8, the machine frame assembly 35 of the fiber lump supply device 17 connects the upper and lower disk-shaped frames 36 and 37 by eight connecting rods 38 arranged at equal intervals in the circumferential direction. It presents a cocoon-shaped structure.
Cartridge holding discs 40 and 42 are fixed to the inner surfaces of the upper and lower disc-like frames 36 and 37, respectively. The cartridge holder 44 is for holding the four cartridges 30 in a revolver type. The cartridge holder 44 is provided so as to be in sliding contact with the upper and lower cartridge holding discs 40 and 42 (fixed side) on the inner side of the machine frame under rotation, and has a semi-moon shaped cartridge receiving groove 45 at four positions every 90 degrees on the outer periphery. The formed cartridge receiving plates 46, 48, the upper and lower cartridge receiving plates 46, 48 are connected, and four rods 49 configured in a rotating bowl shape, and the machine frame assembly 35 (upper and lower disc-shaped frames 36, 37). The rotary shaft 50 is rotatable with respect to the rotary shaft 50, the upper and lower ball bearings 51 and 52 for the rotary shaft 50, and the upper and lower cartridge receiving plates 46 and 48, respectively. Four arcuate cartridge pressing members 53, 54 provided along the inner circumference of the cartridge, four pins 56 that allow the four pairs of upper and lower cartridge pressing members 53, 54 to rotate, and the cartridge The upper and lower pairs of the pressure members 53 and 54 are connected to the upper end of the rotary shaft 50 via a connecting means such as a universal joint, and are rotated by a spring 58 that urges the pin 56 to rotate counterclockwise. The shaft 50 is constituted by a cartridge holder driving motor 60 that rotationally drives the cartridge holder 44. The upper and lower cartridge holding discs 40 and 42 are concentric with the half-moon shaped cartridge receiving groove 45 but have an inner diameter smaller than the outer diameter of the cartridge 30 and a circular opening 64 (installed in a glass single fiber lump supply station SB described later). The cartridge 30 is engaged and held by the lower cartridge support disk 42 without dropping, and the glass monofilament is fed from the cartridge 30 by the fiber mass pressing cylinder 16 at the glass monofilament mass supply station SB. The lump can be supplied to the supply cylinder 14. In the empty cartridge discharge station SC, which will be described later, empty cartridge stoppers 66 are fixed to the upper and lower inner surfaces of the cartridge holding disks 40 and 42, and the thickness of the empty cartridge stopper 66 is in competition with that of the cartridge holding disks 40 and 42. In addition, an arcuate plate shape is formed in sliding contact with the cartridge holding discs 40 and 42 on the inner peripheral side so as not to hinder the rotation of the cartridge holding discs 40 and 42. An edge 66A of the empty cartridge stopper 66 extends in a tangential direction on the downstream side in the rotation direction of the half-moon shaped cartridge receiving groove 45 of the cartridge receiving plates 46 and 48 in the discharge station SC, which will be described later. Can fulfill the function.

  The cartridge holder 44 is rotationally driven by a motor 60, and is a cartridge supply station SA, a glass single fiber lump supply station SB that supplies the glass single fiber lump after the sizing agent removal from each cartridge 30 to the supply cylinder 14, and an empty space. The cartridge can be stopped at the discharging station SC.

  The operation of the rotating cartridge type fiber lump supply device 17 will be described. Glass single fibers in which glass fiber chopped strands are dipped and the spinning sizing agent is dissolved and removed are filled in the cartridge 30 at a predetermined density of 0.2. Necessary number of cartridges 30 are prepared. The cartridge 30 is transferred to the cartridge holder 44 through the supply chute 70 at the cartridge supply station SA. That is, the cartridge is pushed in until it comes into contact with one cartridge receiving groove 45 of the cartridge holding disks 40 and 42 stopped at the cartridge supply station SA (arrow h). At this time, the cartridge pressing members 53 and 54 are lightly pressed against the outer periphery of the cartridge 30 on the inner surface (concave surface) by the spring 58, and the cartridge 30 is held. The cartridge 30 is regulated by the cartridge holding discs 40 and 42 at the top and bottom.

The cartridge holder 44 is rotated by the rotation of the motor 60, and the cartridge 30 is moved in the circumferential direction (arrow g) while being slidably regulated by the cartridge holding disks 40 and 42, and is moved to the glass single fiber lump supply station SB. Thus, the cartridge holder 44 stops. In the stop position, the cartridge 30 is aligned with the circular openings 64 of the upper and lower cartridge holding disks 40 and 42, but the inner diameter of the circular opening 64 is smaller than the outer diameter of the cartridge 30, and the cartridge 30 is held by the glass single fiber lump supply station SB. The
When the air pressure is introduced into the pressing cylinder 16, the piston rod 16-1 is expanded, and the piston 16-2 at the tip of the piston rod 16-1 (the outer diameter is slightly smaller than the inner diameter of the circular opening 64) is on the upper side. The glass monofilament lump introduced into the cartridge 30 through the opening 64 of the cartridge holding disc 40 and pressed inside is pressed downward, and the fiber lump is fed through the opening 64 of the lower cartridge holding disc 42 to the supply cylinder 14. And the cartridge 30 becomes empty.
Thereafter, the piston 16-2 moves upward and backward to a position where it does not hinder the rotation of the cartridge holder 44. A control mechanism including a limit switch, an air direction switching valve, and the like is appropriately provided for controlling the operation of the pressing cylinder 16.

The motor 60, that is, the cartridge holder 44 (upper and lower cartridge receiving plates 46, 48) starts to rotate again, and the empty cartridge 30 is sent to the downstream side in the circumferential direction. Rotation (arrow g) continues.
The empty cartridge 30 abuts against the edge 66A of the empty cartridge stopper 66 and cannot move in the rotational direction beyond this position. However, the cartridge pressing plates 53 and 54 are kept in contact with the spring 58 by continuing the rotation of the cartridge receiving plates 46 and 48. Since the pin 56 is rotated counterclockwise around the pin 56, the empty cartridge 30 engaged with the tip of the cartridge pressing member 53, 54 is pushed out to the discharge chute 72 by the cartridge pressing member 53, 54 (arrow j).
Even if the cartridge pressing members 53 and 54 that have pushed out the empty cartridge 30 by continuing the rotation of the upper and lower cartridge receiving plates 46 and 48 are separated from the empty cartridge 30, the back surface of the cartridge pressing members 53 and 54 that are rotated next ( The empty cartridge 30 is completely sent from the cartridge holder 44 to the discharge chute 72 by the convex surface.

  By repeating and continuing the above operation, a glass single fiber lump is filled into the supply cylinder 14 from a required number of full cartridges 30 and a desired amount of glass single fiber is supplied to the supply cylinder 14 as shown in FIGS. As described, it is opened, mixed and dispersed with a liquid coating material, and a slurry-like coating material containing the desired opened glass monofilament can be obtained.

In this embodiment, the glass single fiber that is mixed and dispersed in a liquid coating material such as an acrylic or urethane coating material to become a slurry-like coating material is obtained by immersing the glass fiber chopped strand in a solvent and dissolving and removing the spinning sizing agent. In order to eliminate the partial agglomeration or entanglement between the single glass fibers, each fiber has been completely opened.
Since single glass fibers are substantially completely opened one by one, the degree of dispersion in the liquid coating material and the contact area between the glass single fiber and the liquid coating material is maximized, and after solidification This does not impair the flexibility of the coating film. Moreover, even if the coating film is thin, a sufficient reinforcing effect can be achieved, and even the structure to be reinforced, for example, deteriorated concrete, can be made to follow subtle irregularities on the surface, and the maximum reinforcing effect can be exhibited. That is, after immersing the glass fiber chopped strand of the present embodiment in a solvent and dissolving and removing the spinning sizing agent, a predetermined amount of the single glass fiber opened into one fiber is a liquid such as an acrylic or urethane coating material. A predetermined amount is mixed with the coating material to form a slurry-like coating material.
By applying the slurry-like coating material of the present invention to the repaired surface of the deteriorated concrete and forming a coating film having a required thickness, the deteriorated concrete can be strongly reinforced. That is, in this embodiment, since the glass single fiber is completely separated into one glass single fiber by opening, the contact area between the coating material and the glass single fiber is increased to the limit, and after drying, The flexibility of the coating film is maintained, and the desired reinforcing effect can be obtained regardless of its thinness.

By the way, in response to the Great East Japan Earthquake, the movement of earthquake resistance diagnosis and earthquake reinforcement of buildings has become hot. In particular, the Ministry of Land, Infrastructure, Transport and Tourism has notified the ceilings that were heavily damaged by "strengthening regulations on ceiling dropout countermeasures based on the Building Standards Law" and "administrative guidance on repairs for buildings that should be improved immediately, such as disaster prevention facilities." The Ministry of Education, Culture, Sports, Science and Technology has issued a notification that “A total inspection is being implemented by promoting measures to prevent falling ceilings at school facilities”.
Even in such a situation, the slurry-like coating material according to the present invention can be repaired with a short work period and a small number of work steps, without requiring a large repair work of the ceiling structure. That is, by applying the slurry-like coating material of the present invention to the entire ceiling surface, the seismic reinforcement of the ceiling structure can be carried out over an extremely short period of time with a small number of man-hours.

  In the present invention, a glass single fiber lump after dissolving and removing the spinning sizing agent in the supply tube 14 or a halogen compound in each cartridge 30 on the upstream side in order to prepare an indoor liquid coating material with added fireproofing and flame retardancy. Etc. can be mixed in an appropriate ratio.

Reinforcing work is usually performed by applying the slurry-like coating material according to the present invention to the surface of the repaired part. Prior to the application of the slurry-like coating material, glass fiber multifilament strands are formed in a comb shape or glass fiber multi-layer. A web formed by weaving a filament strand into a mesh shape can also be used as an underlayer. That is, such a comb-like body or web is stuck together with a primer on a surface to be repaired such as a deteriorated concrete structure, and the slurry-like coating material of the present invention is applied thereon. As a result, a thick coating film can be obtained without taking much time, and further reduction in weight of the coating film can be realized.
Weaving cloth (cross) made of glass fiber multifilament strands in a comb shape or woven in a mesh form from glass fiber multifilament strands has the thickness of single filament, the number of filaments and the basis weight of the woven fabric Various sizes are changed (usually for FRP products (for example, FRP ships)), and those suitable for the purpose of the present invention can be adopted as appropriate.

DESCRIPTION OF SYMBOLS 10 ... Liquid coating material tank 12 ... Stirring means 14 ... Intermediate supply cylinder 15 ... Fiber opening device 16 ... Pressing cylinder 17 ... Rotary cartridge type fiber lump supply device 18 ... 1st rotary body (fiber bundle scraping member of this invention)
18-2 ... disk 18-2B ... projection 18-3 ... spacer 20 ... second rotating body (fiber bundle engaging member of the present invention)
20-2 ... disk 20-2B ... projection 20-3 ... spacer 30 ... cartridge 32 ... elevating rotary motor 35 ... frame assembly 40, 42 ... cartridge holding disk 44 ... cartridge holder 46, 48 ... cartridge receiving plate 50 ... Rotating shafts 53, 54 ... cartridge pressing member 58 ... spring 60 ... cartridge holder drive motor 64 ... circular opening 66 ... empty cartridge stopper

Claims (6)

A method for producing a slurry-like coating material comprising glass single fibers dispersed in a liquid coating material,
The liquid coating material in the liquid coating material tank is stirred so as to form a circulating flow toward the outer periphery at the coating material liquid level and upward at the center of the bottom,
The glass monofilament is agglomerated or bundled into a glass monofilament lump or glass monofilament bundle while scraping the glass monofilament onto the liquid surface of the liquid coating material being stirred, and the liquid coating material liquid A method for producing a slurry-like coating material, wherein the glass single fiber adhering to a surface is dispersed in the liquid coating material by stirring the liquid coating material. The slurry-like shape according to claim 1, wherein the glass single fiber bundle is scraped off from the glass single fiber lump, and then the glass single fiber bundle is opened to adhere the glass single fiber to the liquid surface of the liquid coating material. Manufacturing method of coating material. The liquid coating material being stirred is circulated in the circumferential direction in the liquid coating material tank, and a flow from the center toward the outer peripheral portion and at the outer peripheral portion toward the bottom is formed on the liquid surface of the coating material to form a longitudinal direction and a diameter. The method for producing a slurry-like coating material according to claim 1 or 2, wherein the slurry is circulated in a direction.   The method for producing a slurry-like coating material according to any one of claims 1 to 3, wherein the viscosity of the liquid coating material is 20,000 mPa · s to 80,000 mPa · s.   The manufacturing method of the slurry-like coating material in any one of Claims 1 thru | or 4 whose thickness of the said glass single fiber is 3 micrometers-30 micrometers.   A method for reinforcing a structure to be reinforced, wherein the slurry-like coating material produced by the method according to claim 1 is applied to a surface of the structure to be reinforced and solidified.

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