JP7204034B1 - Two-component curing resin spraying system and two-component curing resin spraying method - Google Patents

Abstract

Kind Code: A1 A two-liquid curable resin in which powders such as a flame retardant and a non-combustible agent are uniformly dispersed and blended can be easily sprayed while maintaining a proper mixing balance of the two liquids (liquid A and liquid B). To provide a spraying construction system for a possible two-liquid curable resin. A spray gun (10) having a spray nozzle (8) for injecting a pre-curing liquid material (12) containing A liquid and B liquid forming a two-component curing resin to the outside, and A liquid and B liquid to the spray gun (10). , and liquid supply systems 20 and 30 for pumping and supplying liquids, respectively. It further includes a powder supply system 50 that supplies powder 22 containing at least one of an incombustible agent and a flame retardant to the spray gun 10 by pressure, and the spray gun 10 supplies the powder 22 after liquid A and liquid B are mixed. are mixed to form the pre-cured liquid material 12 containing the powder 22 . [Selection drawing] Fig. 1

Description

The present invention relates to a two-component curable resin spraying system and a two-component curable resin spraying method using the system.

Resins such as polyurea and polyurethane that form foams are made by mixing two liquids consisting of liquid A, which is mainly composed of polyisocyanate, and liquid B, which is mainly composed of polyol or polyamine, and undergoes a chemical reaction. It is a so-called two-liquid curable resin that is formed by

When spraying a two-component curing resin such as polyurethane or polyurea at a construction site, for example, a tank containing liquid A and liquid B, and a liquid A and B that are pumped from the tank are sprayed with compressed air. A spraying device is used that includes a spray gun that mixes by means of a liquid and immediately discharges it onto a target site such as a wall surface (Patent Document 1). The two-liquid curable resin is formed by curing due to a chemical reaction that occurs when the two liquids are mixed. In order to suppress poor curing and variations in curing time, resin properties, etc., it is necessary to appropriately control the amount ratio and mixing condition of the two liquids.

JP-A-61-263667

In order to improve properties such as flame resistance and non-combustibility of two-component curing resins such as polyurethane and polyurea, or to impart these properties to two-component curing resins, powders such as non-flammable agents and flame retardants are usually used. It is necessary to mix a solid substance or a granular substance (hereinafter collectively referred to as "powder"). For example, in order to spray a two-component curable resin containing powder such as a flame retardant using the spraying apparatus proposed in Patent Document 1, powder is added to at least one of liquid A and liquid B. It will be mixed. However, polyisocyanate, which is the main component of liquid A, has a strong oxidizing action and is a component that easily deteriorates over time. Therefore, it cannot be said that it is practical to mix powder such as a flame retardant with liquid A in advance.

On the other hand, if a powder such as a flame retardant is mixed only with the B liquid, the properties such as the viscosity of the A liquid and the B liquid will be out of balance. For this reason, it becomes difficult to control the mixing amount ratio and mixing condition of the two liquids in the spray gun, resulting in poor curing and variations in resin characteristics, curing time, and the like. In particular, when the line from the tank to the spray gun is long (for example, several tens of meters or longer), it becomes more difficult to control the mixing amount ratio and mixing condition of the two liquids in the spray gun. Furthermore, the storage stability of liquid B to which a powder such as a flame retardant is added is reduced, and problems such as uneven distribution of the powder such as a flame retardant in the formed two-liquid curable resin tend to occur. Become.

The present invention has been made in view of the problems of the prior art, and its object is to maintain a proper mixing balance of the two liquids (liquid A and liquid B) while adding a flame retardant and A two-component curable resin spraying system that can easily spray a two-component curable resin in which powder such as a non-flammable agent is uniformly dispersed, and a two-component curable resin using this system. To provide a spraying construction method.

That is, according to the present invention, there is provided a two-liquid curable resin spraying system described below.
[1] A spray gun having a spray nozzle for injecting a pre-cured liquid material containing A and B liquids that form a two-component curable resin to the outside, and the A and B liquids are respectively injected into the spray gun. A two-liquid curable resin spraying system comprising: a liquid supply system for pumping and supplying powder, wherein powder containing at least one of a non-flammable agent and a flame retardant is pumped and supplied to the spray gun. A two-liquid curing type further comprising a liquid supply system, wherein the spray gun mixes the powder after liquid A and liquid B are mixed to produce the pre-curing liquid containing the powder. Resin spraying system.
[2] The spray gun includes a main chamber for mixing the A liquid and the B liquid to form a liquid mixture, and the liquid mixture and the liquid mixture provided downstream of the main chamber and upstream of the spray nozzle. The two-liquid curable resin spray application system according to [1], further comprising: an after-chamber for collision-mixing powder to generate the pre-cured liquid material and sending the liquid material to the spray nozzle.
[3] The powder supply system includes a pressurized storage tank that stores the powder therein, and an air supply means that supplies air into the storage tank to deliver the powder. [1] or [2] spray application system of the two-liquid curing type resin.
[4] The powder supply system further includes, in the path, powder delivery means having a packing function for maintaining a differential pressure between the upstream side and the downstream side through which the powder delivered from the storage tank flows. a powder distribution line, an air supply line that merges with the powder distribution line through which air flows, and after the powder distribution line and the air supply line merge, the powder is circulated together with the air. A two-liquid curable resin spraying system according to the above [3], further comprising: a main pipe for supplying to the spray gun.
[5] The two-liquid curing according to [3] or [4], wherein the content of the powder in the pre-curing liquid is adjusted by controlling at least one of the following (i) to (iii) Mold resin spraying system.
(i) Internal pressure of the storage tank (ii) Differential pressure between the upstream side and the downstream side of the powder delivery means in the powder distribution line (iii) Flow rate of the air circulated in the air supply line [6] The above The two-liquid curable resin spraying system according to the above [5], further comprising electronic control means for controlling at least one of (i) to (iii).
[7] In the liquid supply system, the pressure for pumping the liquid A and the liquid B is 4.0 to 25.0 MPa, and the powder supply system includes a line having an inner diameter of 8 mm or more and a total length of 100 m or less. The two-liquid curable resin spraying system according to any one of the above [1] to [6].
[8] The nonflammable agent and the flame retardant include red phosphorus, phosphoric acid ester, metal phosphinate, phosphine oxide, phosphazene, phosphorus/nitrogen salt-containing material, phosphorus/metal salt-containing material, phosphorus/halogen-containing material, and bromine. The two-liquid curable resin spray application system according to any one of [1] to [7] above, which is at least one selected from the group consisting of inclusions, boron-containing materials, expanded graphite, and metal hydroxides.
[9] The two-liquid curable resin spraying system according to any one of [1] to [8], wherein the powder further contains a fluidizing agent.

Furthermore, according to the present invention, there is provided a method of spraying a two-liquid curable resin as described below.
[10] A method of spraying a two-component curable resin, comprising the step of spraying a two-component curable resin onto a location to be coated using the spraying system according to any one of claims 1 to 9.
[11] The two-liquid according to [10], wherein the two-liquid curing resin is formed by mixing 5 to 80 parts by mass of the powder with a total of 100 parts by mass of the liquid A and the liquid B. A method of spraying hardened resin.

According to the present invention, a two-liquid curable resin in which powders such as flame retardants and non-combustible agents are uniformly dispersed and blended can be easily sprayed while maintaining a proper mixing balance of the two liquids (liquid A and liquid B). It is possible to provide a two-component curable resin spraying system and a two-component curable resin spraying method using this system.

BRIEF DESCRIPTION OF THE DRAWINGS It is a flowchart which shows one Embodiment of the spray construction system of the 2 liquid hardening type resin of this invention. It is a schematic diagram which shows an example of the mixing mechanism provided in a spray gun. FIG. 4 is a schematic diagram showing an example of members constituting a mixing mechanism; FIG. 4 is a schematic diagram showing an example of members constituting a mixing mechanism; FIG. 4 is a schematic diagram showing an example of members constituting a mixing mechanism; 5 is a graph showing the relationship between each condition during powder pressure feeding and the amount of powder discharged. 4 is a graph showing the relationship between the flow rate of air in an air supply line and the discharge amount of powder. 4 is a graph showing the relationship between differential pressure AB and the amount of powder discharged. 4 is a graph showing the relationship between the degree of opening of the most downstream valve and the discharge amount of powder. 4 is a graph showing the relationship between the elemental phosphorus (P) concentration (%) in the liquid material before curing and the elemental phosphorus (P) concentration (%) in the resin after application (curing).

Embodiments of the present invention will be described below, but the present invention is not limited to the following embodiments. FIG. 1 is a flow diagram showing an embodiment of a two-liquid curable resin spraying system of the present invention. As shown in FIG. 1, the spraying system 100 of the present embodiment includes a spray gun having a spray nozzle 8 for ejecting a pre-curing liquid material 12 containing liquids A and B forming a two-component curing type resin to the outside. 10, and liquid supply systems 20 and 30 for pumping and supplying the A liquid and the B liquid to the spray gun 10, respectively. The spraying system 100 further includes a powder supply system 50 that pumps and supplies powder 22 containing at least one of a nonflammable agent and a flame retardant to the spray gun 10 . The spray gun 10 has a configuration in which the powder 22 is mixed after the liquid A and the liquid B are mixed to generate the pre-cured liquid material 12 containing the powder 22 .

The spray gun 10 includes a main chamber 2 and an after-chamber 4 provided downstream of the main chamber 2 and upstream of the spray nozzle 8 . The main chamber 2 is composed of a member such as a static mixer that mixes the A liquid and the B liquid supplied from the liquid supply systems 20 and 30 to form a liquid mixture. The formed liquid mixture is discharged into the after chamber 4 from a liquid mixture discharge nozzle 6 provided on the downstream side of the main chamber 2 . The liquid mixture discharged into the after-chamber 4 continuously collides and mixes with the powder 22 pumped from the powder supply system 50 and introduced into the after-chamber 4 to produce the pre-curing liquid 12 .

In this way, after mixing the A liquid and the B liquid, by using a spray gun having a configuration that further mixes the powder containing flame retardant and non-flammable to generate the pre-hardening liquid material, Unlike the case where A liquid and B liquid mixed with are introduced into a spray gun and mixed, the mixing amount ratio and mixing condition of these two liquids can be strictly and easily controlled. As a result, it is possible to suppress the occurrence of poor curing, and to suppress variations in the curing time, the properties of the formed two-liquid curable resin, and the like. In addition, since the mixing amount ratio and mixing condition of the two liquids can be appropriately controlled, the distribution state of the powder such as the flame retardant in the formed two liquid curable resin can be made uniform. Furthermore, since no powder is mixed with either of the A liquid and the B liquid before being introduced into the spray gun, it is possible to suppress deterioration in the storage stability of the A liquid and the B liquid.

FIG. 2 is a schematic diagram showing an example of a mixing mechanism provided in a spray gun, (a) being a side view and (b) being a front view. 3A, 3B, and 3C are schematic diagrams each showing an example of a member that constitutes the mixing mechanism. 3A, 3B, and 3C, (a) is a side view of each member, and (b) is a front view of each member. The mixing mechanism 15 includes a main chamber member 13, an afterchamber member 14, and a connecting member 16 connecting these members. The liquid mixture introduced from the base of the main chamber member 13 is discharged from the liquid mixture discharge nozzle 6 into the after chamber 4 formed by the after chamber member 14 . On the other hand, powder is introduced into the after chamber 4 through the powder introduction port 25 of the connecting member 16 and assist air is introduced through the assist air introduction port 27 . For this reason, in the after chamber 4, the vortex flow of the powder formed by the action of the assist air collides and mixes with the liquid mixture to form a pre-curing liquid containing the powder in a uniformly dispersed state. Then, the generated pre-hardening liquid material is discharged from the spray nozzle 8 to the outside and sprayed onto a site to be applied such as a wall surface.

As shown in FIGS. 2 and 3B, the powder inlet 25 and the assist air inlet 27 introduce the powder and the powder into the after chamber 4 from tangential directions opposite to each other in the discharge direction axes of the liquid mixture and the pre-hardening liquid. It is preferable that they are provided so as to introduce assist air respectively. As a result, the vortex of the powder collides with the liquid mixture more efficiently, producing a pre-cured liquid containing the powder in a more uniformly dispersed state, so that the powder is more uniformly dispersed and blended. It becomes possible to spray the two-liquid curable resin, and it is possible to suppress the generation of dust during ejection.

The liquid supply systems 20 and 30 are systems for pumping and supplying the A liquid and the B liquid to the spray gun 10, respectively (Fig. 1). The spray gun 10 is further connected to a compressed air supply system 40 that circulates compressed air for pushing out the liquid mixture formed by mixing the A liquid and the B liquid in the discharge direction (downstream side). The after chamber 4 of the spray gun 10 is connected to a powder supply system 50 (main pipe 60) for introducing powder and an assist air supply system 70 for introducing assist air. The opening/closing states of the powder supply system 50 (main pipe 60), the liquid supply systems 20 and 30, the compressed air supply system 40, and the assist air supply system 70 can be collectively controlled by a trigger 75.

As shown in FIG. 1, the powder supply system 50 includes a pressurized storage tank 24 that stores the powder 22 therein, a compressor 28 that feeds the powder 22 by supplying air into the storage tank 24, and the like. and air supply means. That is, the powder 22 is force-fed to the spray gun 10 by the pressure of air (air flow) supplied from the air supply means. The storage tank 24 is provided with a pressure sensor 32 for detecting the internal pressure of the tank and a weighing scale 34 for detecting the amount of powder in the tank. Air sent out from the compressor 28 is supplied into the storage tank 24 through a flow path provided with a regulator 36 , an air flow meter 38 and a control valve 42 . Then, the powder can be delivered out of the storage tank 24 by the pressure of the supplied air.

The powder supply system 50 further includes a powder distribution line 52 through which the powder delivered from the storage tank 24 flows, an air supply line 54 through which air flows, which merges with the powder distribution line 52, and a powder distribution line. After the line 52 and the air supply line 54 merge, a main pipe 60 for circulating powder together with air and supplying it to the spray gun 10 is provided. A powder delivery means 62 having a packing function for maintaining a differential pressure between the upstream side and the downstream side is provided in the route of the powder distribution line 52 . The air supply line 54 is a channel through which the air sent from the compressor 28 flows, which includes the regulator 36 , the air flow meter 38 and the control valve 42 , and merges with the powder circulation line 52 . The powder delivered from the powder circulation line 52 rides on the air (air flow) sent from the air supply line 54 and is pressure-fed to the main pipe 60 provided with the pressure sensor 32 and the control valve 42. be.

As the powder delivery means 62 having a packing function, for example, a screw-type or rotary-type pump to which an INV disk 65 is connected can be used. By providing the powder delivery means 62 having such a packing function in the path of the powder distribution line 52, the differential pressure generated between the upstream side and the downstream side of the powder delivery means 62 is maintained, and air is supplied. While preventing the inflow (backflow) of air from the line 54, the powder can be more stably and quantitatively delivered to the downstream side.

The powder pumped into the main line 60 is introduced into the afterchamber 4 of the spray gun 10 and impingingly mixes with the liquid mixture to form a pre-cured liquid. The powder content in the pre-curing liquid can be adjusted by controlling at least one of the following (i) to (iii).
(i) Internal pressure of the storage tank 24 (ii) Differential pressure between the upstream side and the downstream side of the powder sending means 62 in the powder distribution line 52 (iii) Flow rate of air circulated in the air supply line 54

For example, by increasing the internal pressure of the storage tank 24, the amount of powder contained in the pre-hardening liquid can be increased. In addition, by increasing the differential pressure between the upstream side and the downstream side of the powder delivery means 62 in the powder distribution line 52 (relatively increasing the pressure on the upstream side), the powder contained in the pre-hardening liquid can be increased. Furthermore, the amount of powder contained in the pre-hardening liquid can be controlled by increasing or decreasing the flow rate of the air flowing through the air supply line 54 .

By providing electronic control means such as a PLC board 68 for controlling at least one of the above (i) to (iii), the powder content in the pre-cured liquid can be automatically controlled. The PLC board 68 is connected to the regulator 36, the air flow meter 38, the control valve 42, the pressure sensor 32, and the INV board 65 (powder delivery means 62) provided in each flow path, and these control devices and sensors can be electronically and automatically controlled.

Parts other than the powder supply system 50, the after chamber 4, the spray nozzle 8, and the assist air supply system 70 of the spraying system 100 of the present embodiment are the same as those of the conventionally known two-liquid curing resin spraying system. has a configuration of That is, the spraying system 100 of this embodiment includes a powder supply system 50, an afterchamber 4, a spray nozzle 8, and an assist air supply system 70 as shown in FIG. It is an extremely versatile system because it can be configured by connecting to

The powder contains at least one of a nonflammable agent and a flame retardant. A "nonflammable agent" is a component that improves the nonflammability of a resin to be blended. A "flame retardant" is a component that improves the non-combustibility of a resin to be blended. Inflammable agents and flame retardants include red phosphorus, phosphoric acid esters, metal phosphinates, phosphine oxides, phosphazenes, phosphorus and nitrogen salt-containing substances, phosphorus and metal salt-containing substances, phosphorus and halogen-containing substances, bromine-containing substances, and boron. Inclusions, expanded graphite, metal hydroxides, and the like can be used. These nonflammable agents and flame retardants can be used singly or in combination of two or more.

The particle size of the powder varies depending on the type of powder (non-flammable agent and flame retardant). For example, the particle size of red phosphorus is about 5 to 15 μm, the particle size of phosphate ester is about 20 to 30 μm, the particle size of expanded graphite is about 100 to 150 μm, and the particle size of metal hydroxide (eg, aluminum hydroxide). is about 1 to 10 μm. In the spraying construction system of this embodiment, the powder is fed by air pressure, so if the particle size of the powder is too large, it becomes somewhat difficult to contain the powder quantitatively in the two-liquid curable resin to be applied. Sometimes. Therefore, the particle size of the powder is preferably 200 μm or less, more preferably 175 μm or less.

In the spraying system of this embodiment, the powder is pumped through the flow path by the air flow. For this reason, the powder preferably further contains a fluidizing agent that improves the fluidity of the nonflammable agent and the flame retardant. Silica, mica, talc, bentonite, zeolite, fly ash, glass beads, and the like can be used as fluidizing agents. These fluidizing agents can be used singly or in combination of two or more. Among these, silica is preferable because it has a particularly good effect of improving fluidity. The average particle diameter (median diameter) of the fluidizing agent is, for example, preferably 1 to 15 μm, more preferably 3 to 10 μm. The amount of the fluidizing agent to be contained in the powder is preferably 1 to 10 parts by mass, more preferably 2 to 5 parts by mass, based on 100 parts by mass of the nonflammable agent and the flame retardant.

In the spraying system of the present embodiment, the pressure for pumping each of liquid A and liquid B in the liquid supply system can normally be 4.0 to 25.0 MPa. In addition, the pressure for pumping each of the A liquid and the B liquid can be appropriately set according to the type of the two-liquid curable resin. For example, when the two-liquid curable resin is polyurethane, the pressure for pumping liquid A and liquid B is preferably 4.0 to 10.0 MPa, more preferably 6.0 to 8.0 MPa. . When the two-liquid curing resin is polyurea, the pressure for pumping each of liquid A and liquid B is preferably 10.0 to 25.0 MPa, more preferably 10.0 to 16.0 MPa. In addition, the powder supply system can usually include a line having an inner diameter of 8 mm or more, preferably 10 mm or more, and a total length of 100 m or less, preferably 90 m or less. In addition, the “line” included in the powder supply system means a route (flow path) from the end of the storage tank or the like to the portion connected to the spray gun.

One embodiment of the method of spraying a two-component curable resin of the present invention includes the step of spraying a two-component curable resin onto a site to be applied such as a wall surface at a building site using the above-described spraying system. . As described above, the spraying system of the present embodiment is provided with a powder supply system that feeds and supplies powder such as a noncombustible agent to the spray gun, and after mixing the two liquids (liquid A and liquid B), the powder It is a system that adopts a configuration that mixes Therefore, it is possible to easily spray a two-liquid curable resin in which the powder is evenly dispersed and blended, even if the concentration is high, while maintaining an appropriate mixing balance of the two liquids. Specifically, usually 5 to 80 parts by mass, preferably 10 to 70 parts by mass of powder are mixed with a total of 100 parts by mass of liquids A and B to form a two-liquid curing resin. can be done.

EXAMPLES The present invention will be specifically described below based on Examples, but the present invention is not limited to these Examples. Hereinafter, "parts" and "%" are based on mass unless otherwise specified.

<Spraying of polyurethane foam>
A commercially available liquid A and liquid B for forming a polyurethane foam were prepared. In addition, as nonflammable agents and flame retardants, red phosphorus (particle size of about 5 to 15 μm), phosphate ester (particle size of about 20 to 30 μm), phosphinate metal salt (particle size of about 1 to 4 μm), phosphine oxide (particle size of about 1 to 4 μm), about 1-30 μm), phosphazene (about 10-100 μm particle size), and expanded graphite (about 100-150 μm particle size) were prepared. Furthermore, silica (particle size: about 1 to 15 μm) was prepared as a fluidizing agent. A spray application system 100 having the configuration shown in FIG. 1 and including the spray gun 10 provided with the mixing mechanism 15 shown in FIG. 2 was prepared. The powder supply system 50 of this spraying system 100 includes a line with an inner diameter of 10 mm and a total length of 20 m. Both the A liquid and the B liquid were heated to 70° C. and pressure-fed by the liquid supply systems 20 and 30 with a pressure of 0.7 MPa, respectively, and introduced into the spray gun 10 . On the other hand, according to the conditions shown in Table 1, powder (a mixture of red phosphorus, phosphate ester, expanded graphite, and silica) was pumped by the powder supply system 50 and introduced into the spray gun 10 . Then, 5 to 40 parts of powder (a mixture of red phosphorus, phosphate ester, expanded graphite, and silica) is mixed with a total of 100 parts of liquid A and liquid B, and the pre-hardening liquid material is discharged from the spray nozzle 8. 12 was discharged and sprayed onto the work site, and while continuously measuring the discharge amount of the powder, a urethane foam in which the powder was uniformly dispersed and blended was formed on the work site. Each condition shown in Table 1 was automatically controlled by a PLC panel 68 as electronic control means.

Also, a graph showing the relationship between each condition at the time of powder pressure feeding and the powder discharge amount, a graph showing the relationship between the air flow rate of the air supply line and the powder discharge amount, the differential pressure AB, Graphs showing the relationship between the amount of powder discharged and the relationship between the opening degree of the most downstream valve and the amount of powder discharged are shown in FIGS.

As shown in FIG. 5, it can be seen that the discharge amount of the powder increased with an increase in the air flow rate of the air supply line, and turned to decrease when the air flow rate exceeded 62 L/min. In addition, the amount of powder discharged stably decreased over an air flow rate of about 100 to 150 L/min. Further, as shown in FIG. 6, the larger the differential pressure (AB) between the internal pressure A of the storage tank and the internal pressure B of the air supply line, the more powder was discharged. Furthermore, as shown in FIG. 7, it can be seen that the larger the opening of the most downstream valve, the greater the amount of powder discharged.

As shown in FIG. 4, when the air flow rate in the air supply line is small and the opening of the most downstream valve is large, the air supplied to the air supply line is released to the front of the line and the pressure difference AB increases, and the amount of powder discharged increases. On the other hand, it can be seen that the opposite phenomenon occurs as the air flow rate increases, that is, the powder discharge amount decreases. From the above, when the air flow rate of the air supply line is 90 to 155 L / min, the differential pressure AB is 2 to 30 Pa, and the opening of the most downstream valve is 30 to 45%, the powder discharge amount is It can be seen that it was possible to secure more stably.

(Examples 1 to 9)
A commercially available liquid A and liquid B for forming a polyurethane foam were prepared. In addition, as nonflammable agents and flame retardants, red phosphorus (particle size of about 5 to 15 μm), phosphate ester (particle size of about 20 to 30 μm), phosphinate metal salt (particle size of about 1 to 4 μm), phosphine oxide (particle size of about 1 to 4 μm), about 1-30 μm), phosphazene (about 10-100 μm particle size), and expanded graphite (about 100-150 μm particle size) were prepared. Furthermore, silica (particle size: about 1 to 15 μm) was prepared as a fluidizing agent. A spray application system 100 having the configuration shown in FIG. 1 and including the spray gun 10 provided with the mixing mechanism 15 shown in FIG. 2 was prepared. The powder supply system 50 of this spraying system 100 includes a line with an inner diameter of 10 mm and a total length of 20 m. Both the A liquid and the B liquid were heated to 70° C. and pressure-fed by the liquid supply systems 20 and 30 with a pressure of 0.7 MPa, respectively, and introduced into the spray gun 10 . On the other hand, powder (a mixture of red phosphorus, phosphoric acid ester, expanded graphite, and silica) was pressure-fed by the powder supply system 50 and introduced into the spray gun 10 under the following conditions. In addition, the elemental phosphorus (P) concentration in the powder used was previously grasped by analyzing by the fluorescent X-ray elemental analysis method. Then, liquids A and B were combined with powder (red phosphorus, phosphate ester, expanded graphite, and silica) so that the elemental phosphorus (P) concentration (%) in the pre-curing liquid material was the value shown in Table 2. (mixture of (2)) was mixed, and the pre-hardening liquid material 12 was discharged from the spray nozzle 8 and sprayed onto the work site to form a urethane foam in which the powder was uniformly dispersed and blended on the work site.

Measure the phosphorus element (P) concentration (%) at any three locations in the urethane foam (resin after construction (curing)) formed on the construction site by fluorescent X-ray elemental analysis, and calculate the average value. Calculated. The results are shown in Table 2 and FIG.

As shown in Table 2 and FIG. 8, the elemental phosphorus (P) concentration (%) in the resin after application (curing) increases with the increase or decrease in the elemental phosphorus (P) concentration (%) in the liquid before curing. It can be seen that there is a high correlation between them. Furthermore, it is clear that the powder was uniformly dispersed and blended in the urethane foam formed on the site to be applied.

The two-component curable resin spraying system of the present invention is for spraying a two-component curable resin such as polyurethane or polyurea imparted with properties such as flame retardancy onto a site such as a wall surface at a construction site. It is useful as a system for

2: Main Chamber 4: After Chamber 6: Liquid Mixture Discharge Nozzle 8: Spray Nozzle 10: Spray Gun 12: Liquid Matter Before Curing 13: Main Chamber Member 14: After Chamber Member 15: Mixing Mechanism 16: Connecting Member 20, 30: Liquid supply system 22: Powder 24: Storage tank 25: Powder inlet 27: Assist air inlet 28: Compressor 32: Pressure sensor 34: Measuring instrument 36: Regulator 38: Air flow meter 40: Compressed air supply system 42: Control valve 50: Powder supply system 52: Powder circulation line 54: Air supply line 60: Main pipe 62: Powder delivery means 65: INV board 68: PLC board 70: Assist air supply system 75: Trigger 100: Spraying system

Claims (9)

a spray gun having a spray nozzle for ejecting a pre-curing liquid material containing liquid A and liquid B forming a two-liquid curing resin to the outside;
A two-liquid curable resin spraying system comprising a liquid supply system for pumping and supplying the A liquid and the B liquid to the spray gun,
further comprising a powder supply system for pumping and supplying powder containing at least one of a non-flammable agent and a flame retardant to the spray gun;
The powder supply system is
a pressurized storage tank containing the powder therein;
an air supply means for supplying air into the storage tank to deliver the powder;
a powder distribution line having, in its path, powder delivery means having a packing function for maintaining a differential pressure between the upstream side and the downstream side through which the powder delivered from the storage tank flows;
an air supply line that merges with the powder distribution line through which air flows;
a main pipe that circulates the powder together with the air after the confluence of the powder distribution line and the air supply line and supplies the powder to the spray gun;
A spray application system for a two-liquid curable resin, wherein the spray gun mixes the powder after the liquid A and the liquid B are mixed to produce the pre-cured liquid containing the powder. The spray gun
a main chamber for mixing the A liquid and the B liquid to form a liquid mixture;
an after-chamber provided on the downstream side of the main chamber and the upstream side of the spray nozzle for collision-mixing the liquid mixture and the powder to generate the pre-hardening liquid material and sending the liquid material to the spray nozzle;
The two-liquid curable resin spraying system according to claim 1, comprising: 2. The two-liquid curing resin spraying system according to claim 1 , wherein the content of said powder in said pre-curing liquid is adjusted by controlling at least one of the following (i) to (iii).
(i) Internal pressure of the storage tank (ii) Differential pressure between the upstream side and the downstream side of the powder delivery means in the powder distribution line (iii) Flow rate of the air circulated through the air supply line 4. The two-liquid curable resin spraying system according to claim 3 , further comprising electronic control means for controlling at least one of (i) to (iii). In the liquid supply system, the pressure for pumping the liquid A and the liquid B is 4.0 to 25.0 MPa,
2. The two-liquid curable resin spraying system according to claim 1, wherein the powder supply system includes a line having an inner diameter of 8 mm or more and a total length of 100 m or less. The nonflammable agent and the flame retardant are red phosphorus, phosphoric acid ester, metal phosphinate, phosphine oxide, phosphazene, phosphorus/nitrogen salt-containing material, phosphorus/metal salt-containing material, phosphorus/halogen-containing material, bromine-containing material, 2. The two-liquid curable resin spraying system according to claim 1, wherein the material is at least one selected from the group consisting of boron-containing materials, expanded graphite, and metal hydroxides. 2. The two-liquid curable resin spraying system according to claim 1, wherein the powder further contains a fluidizing agent. A method of spraying a two-component curable resin, comprising the step of spraying a two-component curable resin onto a location to be coated using the spraying system according to any one of claims 1 to 7 . The two-component curable resin according to claim 8 , wherein 5 to 80 parts by mass of the powder is mixed with a total of 100 parts by mass of the liquid A and the liquid B to form the two-component curable resin. Spray construction method.

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