JP2006142635A - Method for producing foamed molding having ant-proofing property, foamed molding having ant-proofing property, and thermal insulation construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a foamed molding having high ant-proofing performance without allowing a boric acid compound applied on its surface in a stage of preliminarily expanded particles to be separated in a process for molding the preliminarily expanded particles. <P>SOLUTION: In a method in which the preliminarily expanded particles coated with the boric acid compound are packed in a mold, and the foamed molding having a prescribed shape and ant-proofing properties is produced through a heating process and a cooling process, the heating process is made a preliminary heating process comprising one-sided heating and reverse one-sided heating and a main heating process comprising double-sided heating. In the preliminary heating process, a time for the preceding one-sided heating is made to be by at least 50% longer than that for the succeeding reverse one-sided heating. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for producing a foam molded article having ant-proofing properties used as a heat insulating material, a heat insulating material, etc. for a building, a foam molded article having ant-proofing properties, and a foam molded article having the ant-proofing property. It relates to the heat insulation construction method used.

Conventionally, there exists an expanded molded article having ant-proofing properties.
As a method for producing a foam molded article having such an ant-proofing property, an ant-proofing liquid containing an ant-proofing agent or an ant-proofing agent as an active ingredient is applied to the surface of the foamed molded article, and an ant-proofing film is formed on the surface of the molded article A method of forming is known.
In the present specification, the foam-molded article having ant-repellent property means an agent that exhibits insecticidal properties and / or repellency against white ants (referred to herein as an ant-repellent agent or an ant-repellent liquid). .) Is added to, or impregnated with, adhered to, or covered with the foamed molded article, to give a foamed molded article that has been given or improved insecticidal performance and / or repellent performance against white ants.

  However, in the above method, only the surface of the foamed molded product can be given ant protection, and when the surface is eroded by white ants, there is no longer an ant protection effect, and there is no ant path or nest inside. I was worried that I could be built. Further, when applying the ant-proofing liquid to the surface of the foamed molded product, the application work with a brush or the like takes a long time, and spray coating has the problem that the yield is low and it is not economical. Further, when the object to be coated has a complicated shape, there has been a problem that it is difficult to apply the details.

  Therefore, in order to avoid the above-mentioned problems, a boric acid compound as an antifungal agent is coated on the surface of the foamed molded product before molding, that is, at the stage of pre-foamed particles, and the boric acid compound is coated. A method for producing a foamed molded article having ant-proofing properties using the pre-expanded particles is also considered (for example, Patent Document 1).

JP-A-3-202528

  However, as disclosed in Patent Document 1, when the boric acid compound is coated on the surface of the pre-expanded particles, the boric acid compound is simply attached to the surface of the pre-expanded particles in the form of a powder or an aqueous solution. In the subsequent molding step of the pre-foamed particles, the boric acid compound is easily detached from the surface of the pre-foamed particles, and the content of the boric acid compound remaining in the foam-molded product is remarkably reduced. There was a problem that a foamed molded article having ant performance could not be obtained.

  The present invention has been made in view of the above-described problems of the background art, and its purpose is to use a boric acid compound coated on the surface of the pre-expanded particles using the pre-expanded particles. An object of the present invention is to obtain a foamed molded article having high ant-proofing performance without detaching the boric acid compound as much as possible during the molding step.

  As a result of diligent research to achieve the above-mentioned object, the present inventors have found that the boric acid compound coated on the surface at the stage of pre-expanded particles is used during the molding process of the pre-expanded particles. Many boric acid compounds are released in the preheating step for removing air between particles, and further in the reduced-pressure cooling step performed under reduced pressure, and a large amount of boric acid compounds are contained in the vicinity of at least one plate surface. If it is done, pay attention to the fact that it becomes a foamed molded product that can exhibit high ant-proofing performance by using the board side that contains a lot of boric acid compound toward the outside of the building by heat insulation construction. The present invention has been completed.

  That is, according to the present invention of claim 1, pre-foamed particles whose surfaces are coated with a boric acid compound are filled in a mold, and a foam molded article having a predetermined shape of ant-proofing properties is produced through a heating step and a cooling step. In this method, the heating step is a preheating step consisting of one heating and reverse one heating, and a main heating step consisting of double-sided heating. It is characterized by being longer by 50% or more than the heating time.

  Further, the present invention of claim 2 is the invention of claim 1, wherein the cooling step is a water cooling step with water and a reduced pressure cooling step for reducing the pressure, and the time of the reduced pressure cooling step is within 300 seconds. It is characterized by that.

  Furthermore, the present invention of claim 3 is characterized in that, in the invention of claim 1, the cooling step is only a water cooling step with water and a cooling step without depressurization.

  Further, the present invention of claim 4 is a plate-like foamed molded article having ant-proof properties obtained by in-mold molding of pre-foamed particles whose surfaces are coated with a boric acid compound. It is characterized in that the content of the boric acid compound in the plate surface portion is 10% by weight or more than the content of the boric acid compound in the other plate surface portion.

  Further, the present invention of claim 5 is the invention of claim 4, wherein the content of boric acid compound in one plate surface portion of the foamed molded product is 20 than the content of boric acid compound in the other plate surface portion. It is characterized by more than% by weight.

  Furthermore, the present invention of claim 6 is the invention of claim 4, wherein the content of the boric acid compound in one plate surface portion of the foamed molded product is 60 than the content of the boric acid compound in the other plate surface portion. It is characterized by more than% by weight.

  According to a seventh aspect of the present invention, there is provided the foam molded article having ant-proofing properties according to any one of the fourth to sixth aspects, wherein the foamed molded article is constructed on the side of the plate surface portion having a high boric acid compound content. It is characterized by heat insulation construction toward the outside of the object.

According to the first aspect of the present invention described above, the time of the one heating and the reverse one heating which are normally set to substantially the same time is set to be longer than the time of the reverse one heating which is performed first after the one heating time. Since it is set longer than 50%, the movement and detachment of the boric acid compound during the reverse one-side heating to be performed later is suppressed, and the remaining amount of the boric acid compound is large as a whole, and more on the one heating surface side than the one heating surface side. A foamed molded product in which the boric acid compound remains is obtained.
As a result, the reverse heating side, that is, the plate side with a high boric acid compound content, is heat-insulated and used on the building toward the outside of the building. It becomes a foamed molded product.

  Further, according to the present invention of claim 2, in addition to the invention of claim 1 described above, the time of the vacuum cooling process is set to be as short as 300 seconds or less. The amount of boric acid compound sucked and removed from the vicinity of the surface is reduced, and a foamed molded product in which more boric acid compound remains as a whole is obtained, and more boric acid compound on the heating surface side opposite to the heating surface side. A foamed molded product with a remaining amount can be obtained.

  Furthermore, according to the third aspect of the present invention, in addition to the first aspect of the present invention, the cooling step is only a water cooling step with water and a cooling step without depressurization. The boric acid compound is not sucked and removed from the vicinity of the surface of the foamed molded article with more boric acid compound remaining as a whole, and more on the heating surface side opposite to the heating surface side. A foamed molded product in which the boric acid compound remains is obtained.

  Moreover, according to this invention of Claim 4, since content of the boric acid compound in one board surface part of a foaming molding is 10 weight% or more more than content of the boric acid compound in the other board surface part. By using the board surface side with a high content of the boric acid compound facing the outside of the building and performing heat insulation on the building, a high ant protection performance can be expected.

  Furthermore, according to the present invention of claim 5, the content of the boric acid compound in one plate surface portion of the foamed molded product is more than 20% by weight than the content of the boric acid compound in the other plate surface portion. By using the board surface side with a high content of the boric acid compound facing the outside of the building and performing heat insulation on the building, higher ant-proofing performance can be expected.

  Furthermore, according to the present invention of claim 6, the content of the boric acid compound in one plate surface portion of the foam molded article is 60% by weight or more than the content of the boric acid compound in the other plate surface portion. Further, by using the board surface side with a high content of the boric acid compound facing the outside of the building and heat-insulating the building, higher anti-ant performance can be expected.

  Further, according to the present invention of claim 7, the foam molded body having the above-mentioned ant-proofing property is thermally insulated with the plate surface portion side having a large content of boric acid compound in the foam molded body facing the outside of the building. As a result of the construction, a large amount of boric acid compound is contained on the side of the plate surface where the white ants will invade. As a result, the foamed molded body, which is a heat insulating material, can effectively suppress the invasion of white ants.

  Hereinafter, an embodiment of a method for producing a foam molded article having ant-proofing properties according to the present invention, a foam molded article having ant-proofing properties, and a thermal insulation construction method using the foam-molded article having the ant-proofing property will be described. Will be described in detail with reference to the drawings.

  As the pre-expanded particles used in the present invention, pre-expanded particles such as polystyrene resin, polyethylene resin, polypropylene resin, polyurethane resin, and polyvinyl chloride resin can be used. Large polystyrene resin pre-expanded particles are preferred.

  Further, the boric acid compound as an ant preventive used in the present invention is preferable because it has insecticidal properties against white ants but has little toxicity to the human body, and the boric acid compound is conventionally known as an ant preventive. Borate salts such as sodium borate, borate esters and the like can be suitably used. The boric acid compound can be used in powder form, but it is preferable to add it as an aqueous solution.

  As a method for coating the prefoamed particles with the boric acid compound, a boric acid compound is added to the prefoaming machine for producing the prefoamed particles together with raw material beads (foamable unfoamed particles containing a foaming agent). The beads are prefoamed and the boric acid compound is coated on the surface, or the boric acid compound is sprayed on the prefoamed particles while floating the prefoamed particles in the air using, for example, a fluidized bed drying apparatus. Various known methods such as a method of coating the surface with a boric acid compound can be employed.

In producing a foamed molded article having ant-proofing properties according to the present invention using pre-expanded particles having a boric acid compound coated on the surface, for example, a molding machine 1 as shown in FIG. 1 is used.
The molding machine 1 includes a moving mold 1a and a fixed mold 1b. The moving mold 1a includes a moving frame 2 and a male mold 3 attached to the moving frame 2. The mold 1b includes a fixed frame 4 and a female mold 5 attached to the fixed frame 4.

  The male mold 3 and the female mold 5 have a large number of vapor holes 8 communicating from the chamber 7a (or the chamber 7b) to the cavity 6 in order to heat the pre-expanded particles filled in the cavity 6, respectively. It has been drilled.

  The moving frame 2 and the fixed frame 4 are connected to steam introducing pipes 9a and 9b for introducing heating steam in a state communicating with the respective chambers 7a and 7b, and a water introducing pipe 10a for introducing cooling water. , 10b are connected. Further, drain pipes 11a and 11b are connected to the lower ends of the frames 2 and 3, respectively.

  The fixed frame 4 is provided with a filling gun 12 for filling the pre-foamed particles in the cavity 6, and the moving frame 2 is provided with a drive shaft 13 for moving the moving frame 2. ing.

  The foam-molded article having ant-proofing properties of the present invention is filled with pre-foamed particles whose surfaces are coated with a boric acid compound by a filling gun 12 in the cavity 6 of the molding machine 1, and a heating process and a cooling process are performed. It is manufactured after.

  The heating process is performed by introducing heating steam into the chambers 7a and 7b through the steam introduction pipes 9a and 9b. This includes a preheating process including one heating and reverse heating, and double-side heating. There is a main heating step. The pre-heating step is performed for the purpose of pre-heating the pre-expanded particles and removing air from between the pre-expanded particles filled in the cavity 6. For example, the valve of the drain pipe 11a (the valve is not shown) is closed, and the valve (the valve is not shown) of the drain pipe 11b is opened, and the steam introduction pipe is placed in the chamber 7a on the moving mold 1a side. Heating steam is introduced from 9a, passed between the pre-expanded particles filled in the cavity 6, passed through the chamber 7b on the stationary mold 1b side, and heated while flowing the heating steam to the drain pipe 11b. Subsequently, after closing the valve of the drain pipe 11b and opening the valve of the drain pipe 11a, the heating steam is introduced into the chamber 7b on the fixed mold 1b side from the steam introduction pipe 9b. And, passed between the pre-expanded particles are filled into the cavity 6, is passed through the chamber 7a of the movable mold 1a side, an inverse one heating to flow out the heating steam to the drain pipe 11a.

Normally, the one heating and the reverse one heating are set at substantially the same time. However, in the manufacturing method according to the present invention, the time of the one heating performed first is set to 5 times the time of the one reverse heating performed later. More than 10%, preferably 80% or more, more preferably 10% or more. That is, when the time of reverse one heating performed later is set to 10 seconds, it means that the time of one heating performed first is set to 15 seconds or more, preferably 18 seconds or more, more preferably 20 seconds or more. .
In addition, since the molding cycle becomes long if the time for the one heating performed first is too long, the time for the one heating performed first is usually set to 20% longer than the time for the reverse one heating performed later. The upper limit is to do. In addition, the specific time for the one heating performed first is usually 12 to 40 seconds, although it varies depending on the size of the foamed molded product to be obtained.

As described above, by setting the time of the one heating performed first longer than the time of the reverse one heating performed later, the boric acid compound coated on the surface of the pre-expanded particles by the one heating performed first is reversed. The pre-expanded particles on the heating side, i.e., the moving mold 1a side, are largely moved to the heating side, i.e., the fixed mold 1b side, and are foamed by a long pre-heating, resulting in a slightly fused state. Then, the reverse one-side heating performed thereafter moves the boric acid compound in the opposite direction, that is, to the moving mold 1a side, but the time is short, and the pre-expanded particles on the moving mold 1a side Is a state in which a slight fusion is caused by heating on the one hand, so that the boric acid compound is difficult to move to the moving mold 1a side, and there are many boric acid compounds on the fixed mold 1b side. It becomes a state to do.
If the one heating performed first is performed from the fixed mold 1b side, the one heating side opposite to the one heating side is the one heating side is the fixed mold 1b side, and the one other heating side is moved. On the mold 1a side.

  Subsequently, both the valves of the drain pipes 11a and 11b connected to the movable mold 1a and the fixed mold 1b are closed, and the heating steam is introduced into the chambers 7a and 7b from the respective steam introduction pipes 9a and 9b, and a predetermined pressure is applied. The main heating process consisting of double-sided heating is performed for a predetermined time. By this main heating step, the pre-expanded particles filled in the cavity 6 are foamed and fused, and formed into a shape that follows the shape of the space of the cavity 6.

Subsequently, a cooling process is performed. In this cooling process, there are a case where a water-cooling process using water and a pressure-reduction cooling step for reducing the pressure are performed, and a case where a water-cooling process using water and a cooling process for not reducing the pressure are performed.
In the water cooling process with water, the valve of the drain pipe 11a on the moving mold 1a side and the valve of the drain pipe 11b on the stationary mold 1b side are opened, and the cooling water is supplied into the chambers 13a and 13b from the water introduction pipes 10a and 10b. This is done by introducing. The water cooling step using water is preferably as short as possible because the molds 1a and 1b are not cooled too much. However, in the present invention, as described later, the reduced-pressure cooling step is set within a predetermined time or reduced pressure. In order to set it as the cooling process which does not set it as a state, it is necessary to set slightly longer than the time of a normal water cooling process.

After the water cooling step with water, a reduced pressure cooling step for reducing the pressure, or a cooling step for not reducing the pressure is performed.
In the reduced pressure cooling process for reducing the pressure, the valves of the drain pipes 11a and 11b opened for the water cooling process are closed again, and the chambers 13a and 13b are connected by a vacuum pump via a pipe (not shown) communicating with the chambers 13a and 13b. This is a step in which the molded body is allowed to cool in a state in which the air inside is sucked and the chambers 13a and 13b have a predetermined degree of vacuum. Although this reduced pressure cooling process is an effective process for shortening the cooling process time, the boric acid compound existing in the vicinity of the surface layer of the foamed molded product is also removed by suction together with the suction of air in the chambers 13a and 13b. Therefore, in the production method according to the present invention, the time of the reduced pressure cooling step is set within 300 seconds, preferably within 250 seconds, more preferably within 220 seconds (however, 0 is not included). Thereby, the boric acid compound sucked and removed from the vicinity of the surface of the foamed molded article by suction in a reduced pressure state is reduced, and a foamed molded article in which many boric acid compounds remain is obtained.
In addition, the cooling step that does not reduce the pressure is a step in which the valves of the drain pipes 11a and 11b are kept open and the foamed molded product is naturally cooled in the molding machine 1 under atmospheric pressure. Since the cooling step without the reduced pressure state does not suck and remove the boric acid compound from the foamed molded product, a foamed molded product in which more boric acid compound remains can be obtained.

The foamed molded product according to the present invention manufactured through the heating step and the cooling step is a foamed molded product in which many boric acid compounds remain as a whole and many boric acid compounds remain on one plate surface side. Become.
That is, the heating step is a preheating step consisting of one heating and reverse one heating, and a main heating step consisting of double-sided heating. Among the preheating steps, the one heating time performed first is the reverse one heating time performed later. When the production method is set to be longer than 50%, the content of the boric acid compound in at least one plate surface portion of the foamed molded product is 10% by weight than the content of the boric acid compound in the other plate surface portion. More foamed molded products can be produced.
In addition, the time of the one heating performed first is set to be 50% or longer than the time of the reverse one heating performed later, and the cooling process is a water cooling process using water and a reduced pressure cooling process for reducing the pressure. In the case of the production method in which the time for the cooling step is 300 seconds or less, the content of the boric acid compound in at least one plate surface portion of the foamed molded product is 20 than the content of the boric acid compound in the other plate surface portion. A foamed molded body having a weight percentage of more than can be produced.
Furthermore, the manufacturing method in which the time of the one heating performed first is set to be 50% or longer than the time of the reverse one heating performed later, and the cooling process is only a water cooling process using water and a cooling process that is not in a reduced pressure state. In this case, it is possible to produce a foamed molded product in which the content of the boric acid compound in at least one plate surface portion of the foamed molded product is 60% by weight or more than the content of the boric acid compound in the other plate surface portion.

  The reason why it is advantageous that the content of the boric acid compound in one plate surface portion of the foamed molded body is 10% by weight or more than the content of the boric acid compound in the other plate surface portion is, for example, as a whole boric acid compound Even if the content of the foamed molded product is the same, if the content of the boric acid compound in one plate surface portion is larger than the content of the boric acid compound in the other plate surface portion, Insulating the plate surface side with a large content of boric acid compound in the foamed molded body toward the outside of the building makes it more foam-molded against white ants entering from the outside (outside) of the building. This is because the ant road can be made difficult to form, and the effect is considered to increase as the content on the plate surface portion side having a large content increases. Therefore, it is preferable that the content of the boric acid compound in one plate surface portion of the foamed molded body is 20% by weight or more than the content of the boric acid compound in the other plate surface portion, and that it is 60% by weight or more. More preferably, the content of the boric acid compound in one plate surface portion of the foamed molded article is more preferably 60 to 150% by weight of the content of the boric acid compound in the other plate surface portion.

  Note that the boric acid compound content in one plate surface portion of the foamed molded body is 10% by weight or more than the boric acid compound content in the other plate surface portion means that the boric acid compound in the other plate surface portion. When the content of is 1000 ppm, it means that the content of the boric acid compound in the one plate surface portion is 1100 ppm or more.

  Further, in the present invention, the content (weight ratio) of the boric acid compound in the plate surface portion where the boric acid compound content is large is not excessive for improving the ant-proofing performance, and is at least 3000 ppm. Preferably, it is at least 3400 ppm, more preferably at least 3800 ppm, particularly preferably at least 4500 ppm, and most preferably at least 5000 ppm. The upper limit is usually 15000 ppm.

  Further, the content (weight ratio) of the boric acid compound in the plate surface portion where the content of the boric acid compound is small is not too much for improving the ant-proofing performance, and is preferably at least 2800 ppm, More preferred is 3000 ppm, even more preferred is at least 3100 ppm, particularly preferred is at least 3200 ppm, and most preferred is at least 3300 ppm. The upper limit is usually 8000 ppm.

  Further, the content (weight ratio) of the boric acid compound in the center of the foamed molded article is not too much for improving the ant-proofing performance, and is preferably at least 3500 ppm, and preferably at least 4000 ppm. More preferred is at least 4200 ppm, particularly preferred is at least 4400 ppm and most preferred is at least 4600 ppm. The upper limit is usually 10,000 ppm.

  In addition, the average value (weight ratio) of the boric acid compound content (weight ratio) of the foam molded article (the arithmetic average value of the contents of the boric acid compounds in both plate surface portions and the content of the central portion of the foam molded product) is also prevented. In order to improve the ant performance, it is not too much, preferably at least 3000 ppm, more preferably at least 3500 ppm, even more preferably at least 3800 ppm, particularly preferably at least 4000 ppm. Most preferably, it is at least 4500 ppm. The upper limit is usually 10,000 ppm.

  Here, the content of the boric acid compound in the foamed molded product is determined by the weight ratio (ppm) of the ash (residue) left after steaming the measurement piece cut out from the foamed molded product at 550 ° C. for 2 hours, and the boric acid compound. Is substituted with the difference in the weight ratio (ppm) of the same ash (residue) of the foamed molded product without coating.

  Moreover, the plate | board surface part of a foaming molding is intended for two largest surfaces of a plate-like foaming molding, and means a part between each surface and a depth of 0.5 cm from each surface. Moreover, the center part of a foaming molding means the part of thickness 0.5cm which makes the center (center of the thickness direction of a board) between the two largest surfaces of a plate-shaped foaming molding the center of a thickness direction.

  In the measurement of the ash content, which is an index of the content of boric acid compound, from each of the above-mentioned parts, three measurement pieces from any different position (the weight of one measurement piece is 1.0 to 1.4 g) The ash content is measured, and the ash content is measured, and the arithmetic average value of the three measurement results at each part is used as the weight ratio of the ash content of each plate surface portion and the central portion.

  As shown in FIG. 2, the cutout of the measurement piece of each plate surface portion is divided into three when it is assumed that the plate surface is divided into three at positions where the longitudinal direction of the foam molded body is divided into three equal parts. It is performed at a position where each central portion of the plate surface is included. Usually, the center part of each of the three divided plate surfaces and the center part of each divided surface are made to coincide with each other and have a similar shape (however, the thickness is 0.5 cm, and the weight of the measuring piece is 1.0). Is cut out (to a shape of ~ 1.4 g) (positions a, b, and c in FIG. 2). In addition, the measurement piece at the center of the foam molded body is cut out at the center between the two largest surfaces of the plate-like foam molded body at the positions a, b, and c in FIG. Is cut out in the center in the thickness direction and similar to each divided surface (however, the thickness is 0.5 cm, and the weight of the measurement piece is 1.0 to 1.4 g).

  Moreover, the foaming molding which has the ant-proof property which concerns on this invention is plate shape. It is preferable that the foam-molded body is plate-like because it is easy to insulate the building, and particularly if it is a rectangular parallelepiped plate, it is very easy to insulate the building.

  When heat-insulating a building using the foam-molded article having ant-proofing properties according to the present invention, the heat-treating is performed with the plate surface portion side having a large content of boric acid compound facing the outside of the building. At that time, for example, it is most effective in terms of ant-proofing to be constructed so as to be located outside the portion forming the vertical wall of the cloth foundation of the wooden building. As a heat insulation construction site other than the fabric foundation, for example, a framework of a wooden building or the outside of a framework can be cited.

-Coating of pre-expanded particles and boric acid compound-
Expandable polystyrene resin particles (JSP Co., Ltd .: Styrodia JFN200) were prefoamed to a bulk density of 20 g / L using a prefoaming machine (Daisen Industrial Co., Ltd .: DYH1000). During this pre-expansion, the addition of sodium borate _{(Na 2 B 8 O 13 ·} 4H 2 O) aqueous solution (22% strength), the surface of the pre-expanded particles, then the amount coated becomes sodium borate and about 23000~25000ppm It was.

-Manufacture of foam moldings-
Using a molding machine (manufactured by Daisen Kogyo Co., Ltd .: VS-1300), the pre-foamed particles are filled into a mold having two plate-shaped molded products having a molded product size of 910 × 425 × 68 mm, and a heating step using water vapor Then, a foamed molded article was manufactured through a cooling process. The apparent density after drying of the obtained foamed molded product was about 20.5 g / L.
The molding conditions were the various conditions shown in Table 1.

-Measurement of boric acid compound content-
About the obtained foaming molding, from the position of said a, b, and c shown in FIG. 2, the measurement piece of each plate | board surface part and center part (The shape of one measurement piece is 5. in the longitudinal direction of a foaming molding. 7 cm, a rectangular parallelepiped shape having a thickness of 8 cm and a thickness of 0.5 cm in a direction perpendicular to the longitudinal direction, and the weight of one measuring piece was 1.1 to 1.2 g). It measured by the following method.

a: Equipment used 1) Scale: What can measure up to 0.1 mg 2) Crucible: Magnetic crucible for ash content measurement (capacity about 30 ml)
3) Dryer: For sample volume reduction 4) Aluminum cup: Used for sample volume reduction (capacity of about 100ml)
5) Electric furnace: for magnetic crucible steaming 6) Desiccator: crucible, sample is stored up to constant weight 7) Hydrochloric acid: for crucible washing after ash measurement b: measurement method
(1) Measure the weight of the measurement piece with a scale and confirm that it is 1.0 to 1.4 g
(2) Put a test piece in an aluminum cup and reduce the volume with a dryer at 150 ° C for 1 hour.
(3) Leave in a desiccator for 1 day
(4) Measure crucible weight to 0.1 mg (weight WO)
(5) Place the measuring piece in the crucible and measure up to 0.1 mg (weight W1)
(6) Steaming this crucible in an electric furnace at 550 ° C for 2 hours
(7) Cool after steaming and leave the crucible in a desiccator for 1 day
(8) After 1 day, measure the weight of the crucible to 0.1 mg (weight W2)
c: Method for calculating boric acid compound content
i) Measurement piece weight: W3 = W1-W0
ii) Ash weight: W4 = W2-W0
iii) Ash content: K = (W4 / W3) × 1000000 (ppm)
iv) Boric acid compound content: boric acid compound content = (K-400) (ppm)
In addition, 400 (ppm) in the formula of iv) is the ash content of a foamed molded article obtained by molding in the same manner except that the pre-foamed particles are not coated with sodium borate. Further, 1 mol of sodium borate (Na ₂ B ₈ O ₁₃ · 4H ₂ O) used in this example is considered to have changed to a form of 8BO ₃ as a result of steaming at 550 ° C. for 2 hours. It seems that the boric acid compound content in iv) is measuring the content as 8BO ₃ .

-Molding conditions and boric acid compound content-
Table 2 shows the measurement results of the boric acid compound content of the measurement piece sampled from each position for the foamed molded article obtained under each molding condition. FIG. 3 shows a diagram.
In Table 2 and FIG. 3, each measured value represents an average value of each of the measurement pieces a, b, and c at the sampling position of the measurement piece in FIG.

-Result-
Example 1 is a comparative example in which a normal preheating step in which the time of one heating and the opposite one heating is the same is performed as a result of making the one heating time performed first 100% longer than the reverse one heating time performed later In contrast, the boric acid compound can be left in a larger amount, and the content of the boric acid compound in the opposite one heating surface side plate surface portion is more than 15% by weight than the content of the boric acid compound in the one heating surface side plate surface portion. A large number of foamed molded articles could be produced.
In addition, Example 2 is a result of making the one heating time performed first 120% longer than the reverse one heating time performed later, and extending the water cooling time and shortening the vacuum cooling time to 200 seconds, Compared to the comparative example in which the normal preheating step and the cooling step in which the heating time and the reverse heating time on the one side are the same, the water cooling time is minimized, and the reduced-pressure cooling time is as long as 400 seconds, are performed. A large amount of the boric acid compound can be left, and on the other hand, the content of the boric acid compound in the opposite one heating surface side plate surface portion is 23% by weight more than the content of the boric acid compound in the one heating surface side plate surface portion. Could be manufactured.
Further, in Example 3, the time of the one heating performed first was set to be 10% longer than the time of the reverse one heating performed later, and the water cooling time was further increased, and the mixture was allowed to cool without depressurization. Compared to the comparative example in which the normal preheating step and cooling step in which the heating time is the same, the water cooling time is minimized, and the reduced pressure cooling time is as long as 400 seconds, the heating time is further increased. Produces a foamed molded article that can leave a boric acid compound, and that the content of boric acid compound in the opposite one heating surface side plate surface portion is 81% by weight more than the content of the boric acid compound in one heating surface side plate surface portion. We were able to.

1 is a conceptual cross-sectional view showing an example of a molding machine for producing a foam molded article having ant-proofing properties according to the present invention. It is a conceptual perspective view of the foaming molding which showed the sampling position of the measuring piece of boric acid compound content. It is the figure which showed the boric-acid compound content of each site | part of a foaming molding.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Molding machine 1a Moving mold 1b Fixed mold 2 Moving frame 3 Male mold 4 Fixed frame 5 Female mold 6 Cavity 7a Chamber 7b Chamber 8 Steam hole 9a Steam introducing pipe 9b Steam introducing pipe 10a Water introducing pipe 10b Water introducing pipe 11a Drain pipe 11b Drain pipe 12 Filling gun 13 Drive shaft

Claims (7)

  In the method for producing a foamed molded article having a predetermined shape of ant-proofing properties by filling pre-expanded particles coated with a boric acid compound on the surface in a mold and performing a heating step and a cooling step, A preheating step consisting of heating and reverse one-side heating and a main heating step consisting of double-sided heating, and among the preheating steps, the time of one heating performed first was made 50% longer than the time of reverse one heating performed later. The manufacturing method of the foaming molding which has the ant-proof property characterized by the above-mentioned.   The cooling step is a water cooling step with water and a reduced pressure cooling step for reducing the pressure, and the time for the reduced pressure cooling step is set to 300 seconds or less. A method for producing a foam molded article.   The method for producing a foam-molded article having ant-repellent property according to claim 1, wherein the cooling step includes only a water-cooling step with water and a cooling step without taking a reduced pressure state.   In a plate-shaped foam molded article having an anti-rust property obtained by in-mold molding of pre-foamed particles coated with a boric acid compound on the surface, the content of the boric acid compound in one plate surface portion of the foam molded article However, the foamed molded article having ant-repellent property is characterized in that the content of the boric acid compound in the other plate surface portion is 10% by weight or more.   5. The ant repellant according to claim 4, wherein the content of the boric acid compound in one plate surface portion of the foamed molded body is 20% by weight or more than the content of the boric acid compound in the other plate surface portion. Foamed molded article having properties.   5. The ant-proofing composition according to claim 4, wherein the content of the boric acid compound in one plate surface portion of the foamed molded body is 60% by weight or more than the content of the boric acid compound in the other plate surface portion. Foamed molded article having properties. A foam molded article having ant-proofing properties according to any one of claims 4 to 6, wherein the foamed molded article is heat-insulated with the plate surface portion side having a large boric acid compound content facing the outside of the building. A heat insulation construction method that is characterized.

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