JP2019181821A - Fire spread prevention sheet and production method thereof - Google Patents

Abstract

To provide a fire spread prevention sheet excellent in durability in high temperature, and in which peeling hardly occurs.SOLUTION: A fire spread prevention sheet 1 is mainly formed of a glass cloth base fabric 3, a metal sheet 13, and a resin sheet 17, the metal sheet 13 is adhered to the resin sheet 17, and the glass cloth base fabric 3 is adhered to the metal sheet 13. The glass cloth base fabric 3 is formed of a glass cloth 5, a flame-retardant rubber 7 and a filler 9. The filler 9 is provided on one surface of the glass cloth 5 to which the flame-retardant rubber 7 is integrated. The surface on the filler 9 side of the glass cloth base fabric 3 and the metal sheet 13 are adhered by a fusion sheet 11. The metal sheet 13 is a stainless steel sheet, for example. The fusion sheet 11 is formed of a thermoplastic resin such as polyethylene.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fire spread prevention sheet disposed so as to cover an outer periphery of a cable or the like, and a manufacturing method thereof, for example.

  A cable or the like may be laid inside the building or the like. In the event of a fire, etc., there is a risk of spreading fire through this cable. For this reason, in order to prevent such extension, a fire spread prevention sheet is used.

  As such a fire spread prevention sheet, a fire prevention sheet using a flame retardant rubber has been proposed (for example, Patent Documents 1 and 2).

  On the other hand, a cable or the like may be disposed near a high-temperature heat source. The fire spread prevention sheet used in such a place is required to have high durability at a higher temperature.

  Thus, as a fire spread prevention sheet that can ensure durability at higher temperatures, for example, a fire prevention sheet in which a metal sheet is laminated on a flame retardant rubber has been proposed (Patent Documents 3 and 4).

JP 2008-150479 A JP 2006-339099 A JP 11-47297 A Japanese Patent Laid-Open No. 11-9713

  As described above, in order to obtain durability at high temperatures, a method of laminating a flame-retardant rubber sheet and a metal sheet as in Patent Document 3 and Patent Document 4 is effective. In particular, when the flame-retardant rubber laminated on the metal sheet is a glass cloth base cloth integrated with the flame-retardant rubber in a glass cloth, durability at a higher temperature can be obtained.

  However, even if the metal sheet is to be bonded to the glass cloth base cloth, it is difficult to obtain a sufficient bonding strength between the glass cloth base cloth and the metal sheet. For this reason, when the obtained sheet | seat is wound around the outer periphery of a cable, or is affixed on the outer surface of a cable rack etc., a metal sheet and a glass cloth base fabric may peel off, and there exists a possibility that desired durability may not be exhibited.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a fire spread prevention sheet and the like that are excellent in durability at high temperatures and hardly cause peeling.

  In order to achieve the above-mentioned object, the first invention comprises a resin sheet, a metal sheet bonded onto the resin sheet, and a glass cloth base fabric bonded onto the metal sheet, and the glass The cloth base fabric is a glass cloth, a flame retardant rubber integrated with the glass cloth, a sealant disposed on one surface of the metal sheet side on one surface of the glass cloth base fabric, It is a fire spread prevention sheet characterized by comprising.

  The adhesion between the surface of the sealant and the metal sheet is preferably performed by heat fusion using a thermoplastic resin.

  According to the first invention, since the sealant is applied to one surface of the glass cloth base fabric, the unevenness of the glass cloth is smoothed by the sealant. For this reason, the fall of the adhesive strength resulting from the unevenness | corrugation of a glass cloth can be suppressed. For this reason, sufficient peeling strength can be ensured and peeling of the metal sheet can be suppressed during use.

  Here, if a conventional solvent-based adhesive is used for bonding the metal sheet and the glass cloth base fabric, both can be bonded at low cost and at low cost. However, for example, in the bonding process, when time elapses between when the adhesive is applied and cured, such as when the line is stopped, the flame retardant rubber swells due to the components of the adhesive, and the flame retardant rubber deteriorates. It becomes a factor of.

  On the other hand, in this invention, it can suppress that a flame-retardant rubber swells by heat-seal | bonding a metal sheet and a glass cloth base fabric with a thermoplastic resin.

  2nd invention is a manufacturing method of a fire spread prevention sheet, Comprising: The process which integrates a flame retardant rubber in a glass cloth, and one side of the said glass cloth integrated with the said flame retardant rubber A step of producing a glass cloth base fabric by applying an agent, a step of adhering the glass cloth base fabric and the metal sheet, and a step of adhering a resin to the other surface of the metal sheet. A method for producing a fire spread prevention sheet characterized by the above.

  In the step of bonding the glass cloth base fabric and the metal sheet, it is desirable to sandwich a thermoplastic resin sheet and heat-seal both.

  According to the second invention, it is possible to obtain a fire spread prevention sheet that is excellent in durability at high temperatures and can suppress peeling of the metal sheet.

  In particular, by thermally fusing the metal sheet and the glass cloth base fabric, it is possible to suppress the swelling of the flame retardant rubber by the adhesive as compared with the case of using a general solvent-based adhesive. .

  ADVANTAGE OF THE INVENTION According to this invention, the fire spread prevention sheet etc. which are excellent in durability at high temperature and cannot produce peeling easily can be provided.

The figure which shows the fire spread prevention sheet. The figure which shows the fire prevention structure 20. FIG.

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a view showing a fire spread prevention sheet 1 according to the present invention. The fire spread prevention sheet 1 is mainly composed of a glass cloth base cloth 3, a metal sheet 13, a resin sheet 17, and the like. In the fire spread prevention sheet 1, the metal sheet 13 is bonded onto the resin sheet 17, the glass cloth base cloth 3 is bonded onto the metal sheet 13, and the glass cloth base cloth 3, the metal sheet 13, and the resin sheet 17 are laminated. .

  The glass cloth base fabric 3 includes a glass cloth 5, a flame retardant rubber 7, a sealant 9, and the like. The glass cloth 5 is excellent in heat resistance, flame retardancy, and mechanical strength, and is suitable as a base material for fireproof sheets. There are various types of glass cloth 5 depending on the size, weaving method, and mass of the yarn used, but it is sufficient if it has a mechanical strength that is easy to wind in a sheet shape and difficult to break.

  On the surface of the glass cloth 5, a flame retardant rubber 7 is provided and integrated. As the base polymer of the flame retardant rubber 7, rubber-based acrylonitrile butadiene rubber (NBR), acrylic rubber, or the like is applicable. Each of these may be used alone, or both may be blended at an arbitrary ratio. By using acrylonitrile butadiene rubber (NBR) and / or acrylic rubber as the base polymer, excellent oil resistance, flexibility and tackiness can be imparted.

  In order to ensure the flame retardancy, the flame retardant rubber 7 is mixed with a metal hydrate which is an inorganic flame retardant filler. These metal hydrates are non-halogens corresponding to environmental problems, and are useful for adding flame retardancy. As the metal hydrate, for example, aluminum hydroxide, magnesium hydroxide, or a mixture thereof is preferable.

  The flame retardant rubber 7 may be mixed with a borate compound for solidifying retention of combustion residues generated during or after combustion. The flame retardant rubber 7 can be appropriately mixed with a softener in order to moderately soften the base polymer. The softener is not particularly limited as long as it has good compatibility with the base rubber polymer, but ether / ester softener, trimellitic acid softener, and polyester plasticizer are preferable.

  In addition, the flame retardant rubber 7 is mixed with various additives generally used in fire prevention compositions, such as antioxidants, flame retardant aids, fungicides, processing aids, colorants and the like. May be.

  Further, as the flame retardant rubber 7, a non-crosslinked rubber can be preferably used. By using a non-crosslinked rubber composition, the flexibility and adhesiveness are good, and when coated on the glass cloth 5, the adhesion to the substrate is good, and the glass cloth 5 adheres to the glass cloth 5 during combustion. Solidify as it is. In addition, when it is not crosslinked, it can be reused at the time of disposal.

  One side of the glass cloth 5 integrated with the flame retardant rubber 7 (when the flame retardant rubber 7 is formed only on one side of the glass cloth 5, the side opposite to the flame retardant rubber 7) A sealing agent 9 is provided on the surface of the metal sheet 13 (described later). As the sealant 9, urethane or chloroprene (neoprene (registered trademark)) or the like can be applied, but the chloroprene (neoprene (registered trademark)) sealant has lower viscosity. desirable. For example, as the sealant 9, one containing polychloroprene as a main component and containing a small amount of zinc oxide, magnesium oxide, or phenol resin is applicable.

  In addition, as the sealing agent 9, the one where viscosity is low is easy to apply | coat, but if viscosity is too low, it will flow down after application | coating. For this reason, for example, the viscosity is slightly higher than the viscosity of normal water (for example, 1 mPa · s at normal temperature) and lower than the viscosity of heated candy (for example, 20000 mPa · s) (for example, 100 to 10,000 mPa · s). (Approx. S) is preferable. Therefore, the applicable sealant 9 is a member that is sufficiently low in viscosity as compared with the flame-retardant rubber 7, is easy to apply, and has flexibility after drying.

  A metal sheet 13 is bonded to the glass cloth base fabric 3 configured as described above. The metal sheet 13 is a stainless steel sheet, for example. It is desirable that the metal sheet 13 and the surface of the glass cloth base cloth 3 on the side of the sealant 9 be bonded by thermal fusion of the fusion sheet 11. The fusion sheet 11 is made of a thermoplastic resin such as polyethylene.

  Here, if a general solvent-based adhesive is used for bonding the glass cloth base cloth 3 and the metal sheet 13, the cost can be reduced, but the flame-retardant rubber 7 may be swollen by the solvent-based adhesive. is there. For example, if an adhesive is applied to the glass cloth base cloth 3 and immediately bonded to the metal sheet 13 and cured, the swelling of the flame retardant rubber 7 can be suppressed. For example, if there is a time until the adhesive is solidified, the flame retardant rubber 7 may swell. Therefore, in this embodiment, it is desirable to apply the fusion sheet 11 made of a thermoplastic resin.

  A resin sheet 17 is bonded to the other surface of the metal sheet 13 by an adhesive 15. The adhesive 15 may be a general solvent-based adhesive. Moreover, the resin sheet 17 is a PVC sheet, for example. In addition, although illustration is abbreviate | omitted, the release paper which covers an adhesive layer and an adhesive layer on the surface of the resin sheet 17 is arrange | positioned. The pressure-sensitive adhesive layer is used when a fire spread prevention sheet 1 described later is attached to a structure or the like.

  Next, the manufacturing method of the fire spread prevention sheet 1 is demonstrated. First, the glass cloth base fabric 3 is manufactured. For example, the flame retardant rubber 7 is sprayed onto one or both surfaces of the glass cloth 5 to be integrated. If the solution of the flame retardant rubber 7 is excessively diluted to reduce the viscosity and apply it to the glass cloth 5, it is difficult to ensure a sufficient thickness of the flame retardant rubber 7, which is not desirable.

  A sealant 9 is applied to one surface of the glass cloth 5 integrated with the flame retardant rubber 7 by a knife coater. For example, the filler 9 can be easily applied to a substantially constant film thickness by applying the filler 9 on one surface of the glass cloth 5 and applying a knife-like plate with a predetermined clearance.

  The sealant 9 is sufficiently lower in viscosity than the flame retardant rubber 7 when integrated with the glass cloth 5 as described above. Therefore, the unevenness on the surface of the glass cloth 5 can be easily filled. Glass in which one surface of the glass cloth 5 is formed substantially flat by applying the sealant 9 to one surface of the glass cloth 5 integrated with the flame retardant rubber 7 and drying the sealant 9. The cloth base fabric 3 can be manufactured. In addition, since the sealing agent 9 does not have a function as an adhesive agent, the thickness may be thin. For this reason, drying is easy, and since the amount is small, the filler 9 does not adversely affect the flame-retardant rubber 7.

  Next, the obtained glass cloth base cloth 3, the fused sheet 11, and the metal sheet 13 are sent to a pair of rollers heated to about 190 ° C., for example. At this time, the fusion sheet 11 is disposed on the surface of the glass cloth base fabric 3 on which the sealant 9 is applied, and the fusion sheet 11 is sandwiched between the glass cloth base cloth 3 and the metal sheet 13. In this way, the glass cloth base fabric 3 and the metal sheet 13 are bonded by heat fusion using the fusion sheet 11 by pressing under heated conditions.

  Next, the resin sheet 17 is bonded to the other surface of the metal sheet 13. The metal sheet 13 and the resin sheet 17 may be bonded by applying, for example, an acrylic adhesive 15 on one surface of the metal sheet 13 or the resin sheet 17 and bonding them together. The fire spread prevention sheet 1 is manufactured by the above.

  The thickness of the glass cloth base fabric 3 is about 0.25 mm, the thickness of the metal sheet 13 is about 0.1 mm, for example, and the thickness of the resin sheet 17 is about 0.2 mm, for example. The thickness of the landing sheet 11 is, for example, about 0.04 mm.

  Here, the glass cloth base fabric 3 manufactured under the same conditions and changing only the presence or absence of the sealant 9 and the metal sheet 13 were bonded, and the peel strengths of both were evaluated in accordance with JIS K6256-01. As a result, the peel strength, which was 0.21 kgf / 25 mm when the sealant 9 was not present, was improved to 1.02 kgf / 25 mm when the sealant 9 was provided. Thus, the surface roughness of the glass cloth base fabric 3 was flattened by the sealant 9, and the adhesive strength with the metal sheet 13 was increased.

  FIG. 2 is a conceptual diagram showing a fire prevention structure 20 using the fire spread prevention sheet 1. The fire prevention structure 20 is formed with respect to the cable 23 arrange | positioned at the tray 21, for example. A heat source 25 is disposed in the vicinity of the tray 21. The heat source 25 is, for example, a high-temperature facility. The cable 23 laid near the heat source 25 is covered with the fire spread prevention sheet 1 by winding the fire spread prevention sheet 1 from the outer peripheral surface of the tray 21.

  In addition, when winding the fire spread prevention sheet 1 around the tray 21, the resin sheet 17 side is disposed on the inner side, and the glass cloth base cloth 3 side is disposed on the outer peripheral surface. Further, the fire spread prevention sheet 1 may be directly wound around the outer periphery of the cable 23 at a portion where the cable 23 is exposed from the tray 21.

  As mentioned above, according to the fire spread prevention sheet 1 concerning this Embodiment, since the metal sheet 13 is arrange | positioned at an intermediate | middle layer, high durability can be acquired also in a high temperature environment by a thermal-diffusion effect. For this reason, it can be applied to the fire prevention structure 20 in the vicinity of the heat source 25.

  Moreover, since one surface of the glass cloth base fabric 3 is covered with the sealing agent 9, the unevenness of the surface of the glass cloth base fabric 3 can be smoothed. For this reason, the fall of the adhesive strength of the metal sheet 13 and the glass cloth base fabric 3 can be suppressed. In particular, the sealant 9 has a very low viscosity even when compared with the flame retardant rubber 7, so that it can sufficiently reach irregularities and can be easily smoothed. For this reason, the high adhesive strength of the glass cloth base fabric 3 and the metal sheet 13 can be obtained, and peeling at the time of use can be suppressed.

  For example, in order to directly bond the glass cloth base cloth 3 and the metal sheet 13 with an adhesive without using the sealant 9, the unevenness of the glass cloth base cloth 3 cannot be filled with the adhesive. Sufficient adhesive strength cannot be ensured. However, if the adhesive is diluted with a solvent to reduce the viscosity, a sufficient thickness of the adhesive cannot be secured, and the adhesive strength may be reduced. Further, it is necessary to apply an amount of adhesive necessary for adhesion, which causes the swelling of the flame retardant rubber 7 as described above.

  On the other hand, in the present invention, apart from adhesion, first, only the unevenness of the glass cloth base fabric 3 is smoothed by the sealant 9. For this reason, in the subsequent bonding step, it is possible to suppress a decrease in bonding strength due to unevenness. At this time, the sealant 9 itself does not have an adhesive function with the metal sheet 13. For this reason, the amount of the sealing agent 9 (film thickness) sufficient to fill the concave portion of the glass cloth base fabric 3 is sufficient. Therefore, the filler 9 can be easily dried and has little influence on the flame-retardant rubber 7.

  Further, the glass cloth base fabric 3 and the metal sheet 13 are heat-sealed by the fusing sheet 11 instead of a general solvent-based adhesive or the like, so that the flame retardant rubber 7 is swollen by the adhesive component. Can be suppressed. For this reason, it can suppress that the flame-retardant rubber 7 deteriorates and can ensure desired flame-retardant performance.

  As mentioned above, although embodiment of this invention was described referring an accompanying drawing, the technical scope of this invention is not influenced by embodiment mentioned above. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. It is understood that it belongs.

DESCRIPTION OF SYMBOLS 1 ......... Fire spread prevention sheet 3 ......... Glass cloth base cloth 5 ......... Glass cloth 7 ......... Flame retardant rubber 9 ......... Fixing agent 11 ......... Fusion sheet 13 ......... Metal sheet 15 ......... Adhesive 17 ......... Resin sheet 20 ......... Fireproof structure 21 ......... Tray 23 ......... Cable 25 ...... Heat source

Claims (4)

A resin sheet;
A metal sheet bonded onto the resin sheet;
A glass cloth base fabric adhered on the metal sheet;
Comprising
The glass cloth base fabric is a glass cloth, a flame retardant rubber integrated with the glass cloth, and a sealant disposed on one surface of the glass sheet base fabric on one surface of the glass cloth base fabric. When,
A fire spread prevention sheet comprising:   The fire spread prevention sheet according to claim 1, wherein the adhesion between the surface of the filler and the metal sheet is performed by heat fusion using a thermoplastic resin. A method for producing a fire spread prevention sheet,
A process of integrating the glass cloth and the flame-retardant rubber;
Applying a sealant to one surface of the glass cloth integrated with the flame retardant rubber to produce a glass cloth base fabric; and
Bonding the glass cloth base fabric and the metal sheet;
Bonding the resin to the other surface of the metal sheet;
A method for producing a fire spread prevention sheet, comprising:   4. The method for producing a fire spread prevention sheet according to claim 3, wherein, in the step of bonding the glass cloth base fabric and the metal sheet, a thermoplastic resin sheet is sandwiched and both are thermally fused.

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