JP2015074888A - Water surface covering method using urethane foam - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water surface covering method using urethane foam that can cover a water surface by securely and suitably forming a layer of urethane foam on the water surface.SOLUTION: A water surface covering method using urethane foam includes: a shield layer forming process of forming a shield layer 4 comprising a floating body group on a water surface 1a by supplying and floating a plurality of floating bodies 3 which are smaller in specific gravity than water to and on a water surface 1a and thus covering the water surface 1a; and a covering layer forming process of forming a covering layer 7 made of urethane foam on the shield layer 4 by scattering a mixed liquid of isocyanate and polyol. Further, a bearing force layer 8 for securing structure bearing force is stacked and formed on the covering layer 7 made of urethane foam so as to form a covering material 2, covering the water surface 1a, of the shield layer 3, covering layer 7, and bearing force layer 8.

Description

  The present invention relates to a water surface coating method using urethane foam.

  For example, when it is required to prevent foreign matter from entering the water stored in the water tank or the like, or to maintain the state / environment of the stored water, a lid member so as to cover the water surface, A technique of installing a covering sheet or the like is frequently used (for example, see Patent Document 1).

JP 2007-77670 A

  On the other hand, there are many cases where the water surface cannot be covered with a lid member or a covering sheet as in the conventional case. For example, if there is an obstacle on the surface of the water and the lid member or cover sheet cannot be installed by this obstacle, the surface of the water is vast, or the shape (planar shape) of the surface of the water is complex and can be reliably covered without a gap. It may be difficult to manufacture and install a lid member and a covering sheet.

  On the other hand, the inventor of this application considered covering the water surface by forming a urethane foam layer (coating layer) on the water surface by spraying while mixing isocyanate and polyol. According to this, since the urethane foam floats on the water surface, it is possible to cover the water surface simply by spraying the urethane toward the water surface, and even if there are obstacles above the water surface, the water surface is vast. Even if the shape of the water surface is complicated, the water surface can be reliably covered with the urethane foam layer. That is, the problems of the conventional water surface coating method using a lid member or a covering sheet can be solved, and a water surface coating method having excellent versatility and water surface covering property can be created and realized.

  However, simply spraying urethane onto the water surface, the isocyanate is highly reactive with water, so the desired foamed urethane layer is not formed by the mixture of the sprayed isocyanate and polyol, resulting in fine particles. As the foaming progresses at the interface in contact with water, the portion in contact with water does not sufficiently foam, and a problem arises that a foamed urethane layer in a fragile state such as tempura is formed. There is also a problem that the unreacted mixed solution drips and the isocyanate or the like dissolves in water.

  In view of the above circumstances, an object of the present invention is to provide a water surface coating method using urethane foam that makes it possible to reliably and suitably form a foamed urethane layer on the water surface and perform water surface coating.

  In order to achieve the above object, the present invention provides the following means.

  The water surface coating method using urethane foam according to the present invention supplies a plurality of floating bodies having a specific gravity smaller than that of water to the water surface and arranges the water surface so as to cover the water surface, and forms a blocking layer made of a floating body group on the water surface. It comprises a blocking layer forming step and a coating layer forming step of spraying a mixed solution of isocyanate and polyol to form a coating layer made of urethane foam on the blocking layer.

  Further, in the water surface coating method using urethane foam of the present invention, in the coating layer forming step, the mixed liquid is sprayed upward from the horizontal by a spray nozzle, and the reaction product of the mixed liquid is foamed. It is desirable to laminate urethane on the barrier layer in a state close to free fall.

  Furthermore, in the water surface coating method using the urethane foam of the present invention, on the coating layer made of urethane foam, a strength layer for ensuring structural strength is laminated and formed, and the blocking layer, the coating layer, and the It is more desirable to form a covering material that covers the water surface with a load bearing layer.

  In the water surface coating method using urethane foam of the present invention, first, a floating body having a specific gravity smaller than that of water, such as polystyrene foam, rubber, plastic, wood pieces, sawdust, etc., is supplied (sprayed, spread, etc.) to float on the water surface. A blocking layer that covers the water surface is formed by the floating group.

  And by spraying a mixed liquid of isocyanate and polyol on the barrier layer formed by floating the floating body in this way, it is possible to prevent isocyanate from dissolving in water, and the reaction product of isocyanate and polyol so as to cover the water surface It becomes possible to suitably form a urethane foam layer (covering layer, urethane foam layer).

  Furthermore, since the contact between the urethane foam coating layer laminated on the barrier layer and water is inhibited by the barrier layer, the barrier layer (foamed urethane layer) may be formed in a state like a tempura cocoon. In addition, it is possible to prevent the unreacted mixed liquid from dripping and coming into contact with water, and it is possible to suitably form a coating layer made of urethane foam.

  Further, by performing urethane spraying on the barrier layer of the floating body floating on the water surface, the barrier layer and the coating layer made of foamed urethane can be integrated to form a coating material.

  Thereby, according to the water surface coating method using the foamed urethane of the present invention, it is possible to form a covering material for covering the water surface by reliably and suitably spraying urethane, even if there is an obstacle above the water surface. Even if the water surface is vast or the shape of the water surface is complicated, the water surface can be reliably covered with a urethane foam layer (coating layer). Therefore, the problems of the conventional water surface coating method using a lid member or a covering sheet can be solved, and it becomes possible to realize a water surface coating method using urethane foam having excellent versatility and water surface coverage. .

  In addition, when the liquid mixture is sprayed directly toward the barrier layer, the floating body (barrier layer) moves on the water surface with the momentum, and the water surface is exposed. There is a risk that the isocyanate may be dissolved in water and the foamed urethane layer of the coating layer may be formed in a state like a tempura cocoon.

  On the other hand, in the water surface coating method using the urethane foam of the present invention, in the coating layer forming step, a mixed solution of isocyanate and polyol is sprayed upward from the horizontal by a spray nozzle and a reaction product of the mixed solution is generated. By stacking and forming foamed urethane on the barrier layer, the foamed urethane can be deposited on the barrier layer in a state close to free fall and laminated. Thereby, it becomes possible to suitably form the coating layer on the blocking layer without breaking the blocking layer.

  Further, in the water surface coating method using urethane foam of the present invention, a urethane foam layer is further laminated on the coating layer made of urethane foam, or a material such as quick setting air mortar or resin is laminated. When forming a load-bearing layer to ensure structural strength, it is possible to form a covering material having a load-bearing layer together with a barrier layer and a covering layer. For example, foreign substances such as concrete shells, wood, and steel have fallen from above. Even in this case, the foreign material can be received by the covering material and prevented from falling into water.

In the water surface coating method using urethane foam concerning one embodiment of the present invention, it is a figure showing the state (blocking layer formation process) which is supplying the floating body. It is a figure which shows the state (coating layer formation process) which is supplying the liquid mixture of an isocyanate and a polyol on the interruption | blocking layer in the water surface coating | coated method using the urethane foam which concerns on one Embodiment of this invention. In the water surface covering method using urethane foam concerning one embodiment of the present invention, it is a figure showing the state where a yield strength layer was laminated and formed on a covering layer, and a covering material was formed on the water surface.

  Hereinafter, with reference to FIGS. 1 to 3, a water surface coating method using urethane foam according to an embodiment of the present invention will be described.

  As shown in FIGS. 1 to 3, the water surface covering method using urethane foam according to the present embodiment forms a covering material 2 on the water surface 1a, and covers the water surface 1a with the covering material 2, for example, a water tank. The present invention relates to a method for forming a covering material for preventing foreign matter from entering the water 1 stored in the outside or maintaining the state / environment of the stored water 1.

  And in the water surface coating method using urethane foam of this embodiment, first, as shown in FIG.1 and FIG.2, the floating body 3 whose specific gravity is smaller than the water 1 is supplied to the water surface 1a (spreading, developing), and the water surface. The floating body 3 is arranged so as to cover the la, and the blocking layer 4 is formed on the water surface 1a by the floating body group (blocking layer forming step).

  The floating body 3 needs to be particularly limited as long as it can float on the water 1 and cover the water surface 1a without dissolving or eluting harmful substances in the water, such as polystyrene foam, rubber, plastic, wood pieces, sawdust, etc. It is not something to do. Further, the blocking layer 4 is preferably formed in a state where the water surface 1a is covered with the floating body group and the water is almost invisible from above, but this is the case when the isocyanate may be dissolved somewhat in the water 1. is not. At this time, the blocking layer 4 may be formed inhomogeneously, and the floating body 3 such as particles may have a homogeneous shape. However, if the floating body 3 having various shapes and particle sizes is used, voids are generated. It becomes difficult, and it becomes easy to form the interruption | blocking layer 4 of the state which can hardly see water from the top.

  Next, as shown in FIGS. 2 and 3, a mixed solution 5 of isocyanate 5a and polyol 5b is supplied onto the blocking layer 4 from a spray nozzle 6 while mixing the isocyanate 5a and polyol 5b using a urethane sprayer ( (Spreading step). When the isocyanate 5a and the polyol 5b are mixed and sprayed in this way, the isocyanate 5a and the polyol 5b react, and the foamed urethane of the reaction product is deposited on the blocking layer 4, and the coating layer 7 made of urethane foam. Is formed.

  Here, if the mixed liquid 5 is sprayed directly toward the blocking layer 4 formed by the floating body group floating on the water surface 1a, the blocking layer 4 moves on the water surface 1a by the momentum and collapses, and the water surface 1a. Will be exposed. Therefore, particularly in the initial stage of spraying the mixed solution 5 on the blocking layer 4, the mixed solution 5 of the isocyanate 5a and the polyol 5b is sprayed upward from the horizontal by the spray nozzle 6, and the urethane in a state close to free fall. (The reaction product of the mixed solution 5) is deposited on the blocking layer 4 to form the coating layer 7 (7a). Thereby, it can prevent that the interruption | blocking layer 4 moves on the water surface and collapses by the momentum of spraying, and the water surface 1a is exposed.

  Moreover, the mixed solution 5 sprayed from the spray nozzle 6 reacts with the isocyanate 5a and the polyol 5b to form urethane particles. And it is preferable to deposit on the barrier layer 4 before the urethane particles are completely cured and the reaction is completed. When the reaction is incompletely deposited on the blocking layer 4 as described above, the urethane particles adhere to the floating body group forming the blocking layer 4 while the reaction proceeds on the blocking layer 4. Here, for example, in the demonstration experiment, when the mixed solution 5 is sprayed from a height of 30 to 50 cm from the surface of the blocking layer 4, the reaction time of the mixed solution 5 is gained by the air spraying, and the blocking layer 4 is in a suitable state. It has been confirmed that it can be dropped onto the (water surface 1a).

  Furthermore, the urethane particles further deposited on the urethane particles deposited on the blocking layer 4 are securely fixed integrally. Thereby, the blocking layer 4 made of a floating body group floating on the water surface 1a and the coating layer 7 made of foamed urethane are integrated, and a covering material covering the water surface 1a is formed on the water surface 1a.

  Then, it is possible to form a coating layer 7 having a desired layer thickness by directly spraying the liquid mixture at a stage where a certain layer thickness is secured by depositing urethane on the blocking layer 4 in a state close to free fall. become. At this time, the part (covering layer 7b) on which the liquid mixture 5 is directly sprayed and laminated is formed with a denser structure than the part formed by free fall.

  At this time, urethane particles are deposited on the blocking layer 4 floating on the water surface 1a, and the contact with the water 1 is almost blocked, so that the component 5 of the mixed solution 5 of the isocyanate 5a and the polyol 5b is dissolved in water, Urethane reaction proceeds in contact with water 1, and urethane foam is not formed in a tempura-like state.

  In addition, for example, when it is difficult to take the distance of free fall of dispersion, and there is a possibility that the mixed liquid 5 (urethane particles) may fall on the blocking layer 4 and dissolve in the water 1 before necessary curing proceeds to some extent. What is necessary is just to raise the reaction rate of the liquid mixture 5 by raising the temperature of the undiluted | stock solution of the isocyanate 5a and the polyol 5b, by extension, the temperature of the liquid mixture 5, or applying techniques, such as a froth injection method.

  Further, when the mixed liquid 5 of the isocyanate 5a and the polyol 5b is deposited on the blocking layer 4 in a state close to free fall, the separated urethane particles may be deposited, and the coating layer 7a may be formed in a porous state. And when the lamination thickness is increased and the weight is increased, the water 1 may be infiltrated into the porous coating layer 7a. On the other hand, when the experiment is repeated and a thickness of about 3 to 5 cm is formed in a state close to free fall, even if the coating layer 7 having a layer thickness of about 50 cm is formed, the water 1 depends on the layer thickness and weight. It has been confirmed that leaching can be reliably prevented.

  On the other hand, in the water surface coating method using urethane foam according to the present embodiment, at the stage where the coating layer 7 made of urethane foam is formed as described above, as shown in FIG. Is formed by laminating and forming the covering material 2 that covers the water surface 1a by the blocking layer 4, the covering layer 7, and the yielding layer 8.

  That is, for example, when it is necessary to prevent heavy foreign matter such as concrete shells, wood, and steel materials from falling into the water 1 from above, for example, in dismantling work, the necessary structural strength is imparted. Therefore, the covering material 2 may be formed with the load bearing layer 8 for the purpose.

  The load bearing layer 8 of the present embodiment is formed by, for example, laminating a foamed urethane layer on the coating layer 7 made of foamed urethane, or comparing inorganic materials such as quick-setting air mortar and resin materials. It is formed by laminating curable materials having a low specific gravity. Thereby, the covering material 2 formed by using the water surface covering method using urethane foam according to the present embodiment is formed by integrally laminating the blocking layer 4, the covering layer 7, and the load-bearing layer 8, so that the structural strength is surely ensured. By providing the load-bearing layer 8 for securing the foreign matter, even if the foreign matter falls, the covering state does not collapse, and the foreign matter is surely prevented from falling into water.

  Therefore, in the water surface coating method using urethane foam according to the present embodiment, a floating body 3 having a specific gravity smaller than that of the water 1 such as foamed polystyrene, rubber, plastic, wood pieces, sawdust, etc. is supplied to the water surface 1a in advance (spreading, spreading, etc.) Then, the blocking layer 4 that covers the water surface 1a is formed by a group of floating bodies floating on the water surface 1a.

  And by spraying the mixed solution 5 of the isocyanate 5a and the polyol 5b on the blocking layer 4 formed by floating the floating body 3 in this way, it is possible to prevent the isocyanate 5a from being dissolved in the water 1 and to cover the water surface 1a. Thus, it becomes possible to suitably form a foamed urethane layer (coating layer 7, foamed urethane layer) of the reaction product of isocyanate 5a and polyol 5b.

  Further, since the contact between the foamed urethane coating layer 7 laminated on the blocking layer 4 and the water 1 is suppressed by the blocking layer 4, the coating layer 7 may be formed in a tempura cocoon state. It is possible to prevent the unreacted liquid mixture 5 from dripping and coming into contact with the water 1, and the coating layer 7 made of urethane foam can be suitably formed.

  Further, by performing urethane spraying on the blocking layer 4 of the floating body 3 floating on the water surface 1a, the blocking layer 4 and the coating layer 7 made of foamed urethane can be integrated to form a coating material.

  Thereby, according to the water surface coating method using urethane foam of the present embodiment, it is possible to form a covering material that covers the water surface 1a by reliably and suitably spraying urethane, and there is an obstacle above the water surface 1a. Even if the water surface is vast or the shape of the water surface 1a is complicated, the water surface 1a can be reliably covered with the urethane foam layer (coating layer 7). Therefore, the problems of the conventional water surface coating method using a lid member or a covering sheet can be solved, and it becomes possible to realize a water surface coating method using urethane foam having excellent versatility and water surface coverage. .

  Moreover, when the liquid mixture 5 is sprayed directly toward the blocking layer 4, the floating body 3 (blocking layer 4) moves on the water surface 1a with the momentum, so that the water surface 1a is exposed, and the mixed solution 5 and its reaction product are exposed. There is a possibility that the foamed urethane that is in contact with the water 1 and the isocyanate 5a dissolves in the water, or the foamed urethane layer of the coating layer 7 is formed in a state like a tempura straw.

  On the other hand, in the water surface coating method using urethane foam of this embodiment, in the coating layer forming step, the spray nozzle 6 sprays the mixed solution 5 of the isocyanate 5a and the polyol 5b upward from the horizontal. By forming the urethane foam of the reaction product of the mixed solution 5 on the blocking layer 4, the urethane foam can be deposited on the blocking layer 4 in a state close to free fall to form a laminate. Thereby, the covering layer 7 (7a) can be suitably formed on the blocking layer 4 without breaking the blocking layer 4.

  Furthermore, in the water surface coating method using urethane foam of the present embodiment, a foamed urethane layer is further laminated on the coating layer 7 made of urethane foam, or materials such as quick setting air mortar and resin are used. By laminating and forming the strength layer 8 for ensuring the structural strength, the covering material 2 including the strength layer 8 together with the barrier layer 4 and the covering layer 7 can be formed. For example, concrete shell, wood, steel material from above Even when a foreign object such as a foreign substance has fallen, it is possible to prevent the foreign substance from being dropped into the water 1 by being received by the covering material 2.

  As mentioned above, although one embodiment of the water surface covering method using urethane foam concerning the present invention was described, the present invention is not limited to the above-mentioned one embodiment, and can be suitably changed in the range which does not deviate from the meaning. is there.

DESCRIPTION OF SYMBOLS 1 Water 1a Water surface 2 Coating | covering material 3 Floating body 4 Barrier layer 5 Liquid mixture 5a Isocyanate 5b Polyol 6 Spray nozzle 7 Coating layer 7a Coating layer 7b Coating layer 8 Strength layer

Claims (3)

A barrier layer forming step of supplying a plurality of floating bodies having a specific gravity smaller than water to the water surface and covering the water surface, and forming a barrier layer made of a group of floating bodies on the water surface;
A water surface coating method using urethane foam, comprising a coating layer forming step of forming a coating layer made of foamed urethane on the blocking layer by spraying a mixed solution of isocyanate and polyol. In the water surface coating method using the urethane foam according to claim 1,
In the coating layer forming step, the mixed liquid is sprayed upward from the horizontal by a spray nozzle, and the foamed urethane of the reaction product of the mixed liquid is laminated on the blocking layer in a state close to free fall. Water surface coating method using urethane foam characterized by In the water surface coating method using the foamed urethane according to claim 1 or 2,
A layer of a strength layer for securing structural strength is formed on the coating layer made of urethane foam, and a coating material that covers the water surface with the barrier layer, the coating layer, and the strength layer is formed. Water surface coating method using urethane foam.

Images