JP2007321047A - Adhesive composition for expanded polystyrene - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an adhesive composition for expanded polystyrene, capable of adhering a waterproof sheet on a heat insulating material to rigidly fix when performing athermalizing and waterproofing execution of adhering rubber waterproofing sheet on a basis through the heat insulating material. <P>SOLUTION: The adhesive composition for expanded polystyrene, usable for adhering a waterproofing sheet 7 on a heat insulating material 2 in an athermalizing and waterproofing method adhering the waterproofing sheet 7 on a basis 1 through the heat insulating material 2 is provided. The adhesive composition for expanded polystyrene is prepared by compounding 10-80 pts.mass tackifier and 300-800 pts.mass solvent comprising at least aliphatic hydrocarbon solvent, per 100 pts.mass elastomer. The aliphatic hydrocarbon-based solvent is low in polystyrene solubility, damages no heat insulating material of polystyrene, and can adhere to the rubber waterproofing sheet 7 by coating the adhesive composition on the heat insulating material. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  INDUSTRIAL APPLICABILITY The present invention is used for adhering a rubber waterproof sheet to a foamed polystyrene heat insulating material in a heat insulating waterproofing method in which a rubber waterproof sheet is attached to a building rooftop via a foamed polystyrene heat insulating material. The present invention relates to an adhesive composition for expanded polystyrene.

  On the rooftop of a building or the like, a heat insulating waterproofing construction is performed by sticking a waterproof sheet via a heat insulating material on a base formed of mortar or concrete (for example, Patent Document 1 and Patent Document 2). Etc.).

  Here, as the waterproof sheet, a rubber sheet made of vulcanized rubber or a resin sheet made of polyvinyl chloride or the like is used. And in the thing of said patent document 1, the waterproof sheet made from a polyvinyl chloride is used, and it is trying to use a foamed polyethylene or a foamed polypropylene as a heat insulating material, and adheres a heat insulating material to a foundation | substrate with a nitrile rubber adhesive. At the same time, a waterproof sheet is bonded onto the heat insulating material with a chloroprene rubber adhesive. However, the waterproof sheet made of polyvinyl chloride has a problem in durability and the like as compared with that made of rubber, and foamed polyethylene and foamed polypropylene have a high cost and have a problem that the heat insulating performance is lower than foamed polystyrene.

On the other hand, Patent Document 2 discloses that a waterproof sheet made of rubber such as butyl rubber or ethylene propylene rubber is used. In addition to foamed polyethylene or foamed polyurethane as a heat insulating material, foamed polystyrene is inexpensive. Is disclosed. Thus, in the thing of patent document 2, since the thing made from rubber | gum excellent in durability etc. is used as a waterproof sheet, and cost-effective and heat insulation performance is high as a heat insulating material using low cost and high heat insulation performance. Thermal insulation waterproofing can be performed.
JP-A-8-312073 JP 2002-114957 A

  However, in Patent Document 2, an adhesive based on a chloroprene adhesive is used as an adhesive for adhering the waterproof sheet on the heat insulating material. When foamed polystyrene is used as the heat insulating material, the chloroprene adhesive is used. The foamed polystyrene may be dissolved by an organic solvent such as aromatic, ketone or ester contained in the agent.

  Thus, when using a heat insulating material made of expanded polystyrene, it is difficult to take a construction method in which a waterproof sheet is bonded to the heat insulating material using an adhesive. For this reason, a method of fixing a heat insulating material to a base using a disk plate and an anchor, and heat-sealing a waterproof sheet to the disk plate exposed on the surface of the heat insulating material (Japanese Patent Laid-Open Nos. 8-74390 and 2003-35013). For example, or a construction method in which a waterproof sheet is stacked on a heat insulating material and fixed to a base with a disk plate and an anchor. However, in these cases, since the waterproof sheet is only partially fixed, there is a problem that the waterproof sheet may be peeled off due to destruction of the fixed part of the waterproof sheet in a strong wind or the like.

  The present invention has been made in view of the above points, and in carrying out heat insulation waterproofing construction in which a rubber waterproof sheet is attached to a base via a heat insulating material made of expanded polystyrene, the waterproof sheet is bonded onto the heat insulating material. Thus, an object of the present invention is to provide an adhesive composition for expanded polystyrene that can be firmly fixed.

  The adhesive composition for expanded polystyrene according to claim 1 of the present invention is used for adhering a waterproof sheet to a heat insulating material in a heat insulating waterproofing method in which a waterproof sheet made of rubber is attached to a base via a heat insulating material made of expanded polystyrene. The adhesive composition for expanded polystyrene used in the above, wherein 10 to 80 parts by mass of the tackifier is added to 100 parts by mass of the elastomer, and 300 to 800 parts by mass of a solvent comprising at least an aliphatic hydrocarbon solvent is blended. It is characterized by comprising.

  According to this invention, the aliphatic hydrocarbon solvent has low polystyrene solubility, and can adhere and firmly fix the rubber waterproof sheet to the heat insulating material without invading the heat insulating material made of expanded polystyrene. In addition, the adhesive composition containing an aliphatic hydrocarbon solvent is organic solvent-based and has higher volatility than the case of water-based adhesives. It is something that can be done. Moreover, the adhesiveness of the waterproof sheet to a heat insulating material can be improved with a tackifier.

  The invention of claim 2 is the invention according to claim 1, wherein, as the solvent, at least one of the first solvent composed of the above aliphatic hydrocarbon solvent, the aromatic hydrocarbon solvent, and the alicyclic hydrocarbon solvent is used. And a second solvent comprising: a first solvent / second solvent mass ratio of 90/10 to 60/40.

  According to this invention, as the solvent, an aliphatic hydrocarbon solvent that does not easily attack the expanded polystyrene, and an aromatic hydrocarbon solvent or alicyclic hydrocarbon solvent having a lower volatilization rate than the aliphatic hydrocarbon solvent. In combination, by delaying the evaporation of the solvent when the adhesive composition is applied, it is possible to prevent dew condensation from occurring on the surface of the adhesive composition due to the rapid loss of heat of vaporization. The bonding workability can be improved.

  The invention of claim 3 is characterized in that, in claim 1 or 2, 5 to 30 parts by mass of a plasticizer is blended with 100 parts by mass of the elastomer.

  According to the present invention, it is possible to impart tackiness at a low temperature by a plasticizer, to ensure adhesiveness during construction under low temperature conditions, and to enhance the adhesion workability at a low temperature. It can be done.

  The invention of claim 4 is characterized in that in any one of claims 1 to 3, the filler is blended in an amount of 1 to 100 parts by weight with respect to 100 parts by weight of the elastomer.

  According to this invention, the handleability of the adhesive composition can be facilitated by the increase by the extender, and the bonding workability can be improved.

  According to the present invention, since the aliphatic hydrocarbon solvent has low polystyrene solubility, the waterproof sheet can be strengthened by adhering the rubber waterproof sheet to the heat insulating material without damaging the heat insulating material made of expanded polystyrene. It can be fixed. Moreover, the adhesive composition containing the aliphatic hydrocarbon solvent is an organic solvent solvent, and has higher volatility than the case of the water-based adhesive, and can be applied with good workability in a short time. In addition, the adhesion of the waterproof sheet to the heat insulating material can be enhanced by the tackifier.

  Hereinafter, the best mode for carrying out the present invention will be described.

  In the adhesive composition according to the present invention, the elastomer is not particularly limited, but chloroprene rubber (CR), butyl rubber (IIR), polyisobutylene, styrene butadiene rubber (SBR), natural rubber (NR), and the like. Can be used.

  Further, in the adhesive composition according to the present invention, the tackifier is not particularly limited, but is aliphatic hydrocarbon resin, alicyclic hydrocarbon resin, rosin resin, phenol resin, terpene resin. Petroleum resin or the like can be used.

  The adhesive composition according to the present invention can be prepared by blending and dissolving the elastomer and the tackifier in the solvent. The present invention uses an aliphatic hydrocarbon solvent as the solvent. The aliphatic hydrocarbon solvent is not particularly limited, but normal hexane, normal heptane, cyclohexane, and other alcohols can be used. Since these aliphatic hydrocarbon solvents have low polystyrene solubility, it is possible to obtain an adhesive composition that dissolves foamed polystyrene and hardly corrodes it.

  In the present invention, the solvent can be used as a mixed solvent by using at least one of an aromatic hydrocarbon solvent and an alicyclic hydrocarbon solvent in addition to the aliphatic hydrocarbon solvent. Aromatic hydrocarbon solvents and alicyclic hydrocarbon solvents have a slower volatilization rate than aliphatic hydrocarbon solvents, and the combined use of aromatic hydrocarbon solvents and alicyclic hydrocarbon solvents Even when the adhesive composition is low, the volatilization rate after application of the adhesive composition can be adjusted to prevent the occurrence of condensation on the surface of the adhesive composition, and the adhesion workability can be improved. As the aromatic hydrocarbon solvent, toluene or xylene can be used, and as the alicyclic hydrocarbon solvent, cyclohexanone, xylene hydrogenated product (a mixture of ethylcyclohexane and dimethylcyclohexane) or the like can be used. Moreover, industrial gasoline etc. can be used as a solvent containing an aromatic hydrocarbon type and an alicyclic hydrocarbon type.

  The mixing ratio of the aliphatic hydrocarbon solvent to the aromatic hydrocarbon solvent or the alicyclic hydrocarbon solvent is such that the aliphatic hydrocarbon solvent is the first solvent, the aromatic hydrocarbon solvent or the alicyclic solvent. When the hydrocarbon solvent is the second solvent, the mass ratio of the first solvent / second solvent is preferably set to 90/10 to 60/40. If the ratio of the aromatic hydrocarbon solvent or alicyclic hydrocarbon solvent is less than this range, the effect of improving the adhesion workability by using the aromatic hydrocarbon solvent or alicyclic hydrocarbon solvent together will not be achieved. If it is sufficient and exceeds this range, the expanded polystyrene may be dissolved and attacked by the aromatic hydrocarbon solvent or alicyclic hydrocarbon solvent, making it difficult to use as an adhesive for expanded polystyrene. Become.

  In the adhesive composition of the present invention, the compounding amount of the tackifier is set in the range of 10 to 80 parts by mass with respect to 100 parts by mass of the elastomer. By blending the tackifier, it is possible to impart adhesiveness to the adhesive composition to enhance the adhesiveness. When the blending amount of the tackifier is less than 10 parts by mass, the adhesiveness is improved. The effect of enhancing cannot be obtained sufficiently. On the other hand, when the compounding amount of the tackifier exceeds 80 parts by mass, the amount of elastomer in the adhesive composition decreases, and in this case, the adhesiveness also decreases. As described above, in either case, there is a problem in workability when the adhesive composition is applied and bonded.

  In addition, the amount of the solvent is 100 parts by mass of the elastomer, when the aliphatic hydrocarbon solvent is blended alone as the solvent, or when the aromatic hydrocarbon solvent or the alicyclic hydrocarbon solvent is used in combination. , Both are set in the range of 300 to 800 parts by mass. When the blending amount of the solvent is less than 300 parts by mass, the viscosity of the adhesive composition is increased, the fluidity is deteriorated, and it is difficult to apply uniformly. On the other hand, when the blending amount of the solvent exceeds 800 parts by mass, the viscosity of the adhesive composition becomes low and it becomes easy to flow, and it becomes difficult to apply at a predetermined coating amount. As described above, in either case, there is a problem in workability when the adhesive composition is applied and bonded.

  Moreover, a plasticizer and an extender can be mix | blended with the adhesive composition of this invention as needed.

  The plasticizer is not particularly limited, and dibutyl phthalate, dioctyl phthalate, dioctyl adipate, diisocecil adipate, and the like can be used. By blending a plasticizer, it is possible to impart tackiness at low temperatures to the adhesive composition, it is possible to ensure the adhesiveness during construction under low temperature conditions, and at low temperatures Adhesive workability can be improved.

  The blending amount of the plasticizer is preferably in the range of 5 to 30 parts by mass with respect to 100 parts by mass of the elastomer. When the blending amount of the plasticizer is less than 5 parts by mass, the effect of imparting tackiness at a low temperature becomes insufficient, and the adhesiveness at a low temperature becomes insufficient. On the other hand, if the blending amount of the plasticizer exceeds 30 parts by mass, the amount of elastomer in the adhesive composition decreases, and in this case, the adhesiveness may be insufficient.

  The filler is not particularly limited, and inorganic fillers such as heavy calcium carbonate, light calcium carbonate, clay, and titanium can be used. By blending the filler, the handling of the adhesive composition is facilitated, and the blending amount of the filler is preferably in the range of 1 to 100 parts by weight with respect to 100 parts by weight of the elastomer. If the blending amount of the extender is less than 1 part by mass, the effect of blending the extender cannot be sufficiently obtained. Conversely, if it exceeds 100 parts by mass, the amount of elastomer in the adhesive composition There is a risk that the adhesiveness will be reduced.

  Next, a method for performing heat insulation and waterproofing on the rooftop of a building will be described. A floor surface of a building rooftop or the like is formed as a cement-based foundation 1 such as concrete or mortar. First, a heat insulating material 2 formed of a foamed polystyrene sheet is fixed to the surface of the foundation 1. The heat insulating material 2 can be fixed to the base 1 as shown in FIGS. 1 (a) and 1 (b). FIG. 1A shows an example in which an adhesive 3 is used to adhere and fix the entire lower surface of the heat insulating material 2 to the base 1 with the adhesive 3. As the adhesive 3, it is preferable to use an aqueous adhesive that does not dissolve foamed polystyrene. For example, a chloroprene-based aqueous adhesive disclosed in Japanese Patent Application Laid-Open No. 2000-282001 can be used. In FIG. 1B, a heat insulating material 2 is laid on the base 1, and a disk 4 is placed on the heat insulating material 2 at an important point, and the anchor 5 is attached to the base 1 through the heat insulating material 2 from above the disk 4. , The heat insulating material 2 is fixed to the base 1 with the disk 4 and the anchor 5.

  After fixing the heat insulating material 2 made of polystyrene foam to the base 1 in this way, a waterproof sheet 7 made of rubber sheet is adhered on the heat insulating material 2 with the adhesive composition 6 of the present invention, thereby heat insulating waterproofing construction. Is something that can be completed. The adhesive composition 6 is applied to the surface of the heat insulating material 2, the waterproof sheet 7 is stacked thereon, and the adhesive composition 6 is cured, whereby the waterproof sheet 7 is formed as shown in FIGS. It can be adhered to the surface of the heat insulating material 2. The adhesive composition 6 may be applied to the surface of the heat insulating material 2 as described above, or may be applied to the waterproof sheet 7, or may be applied to both the heat insulating material 2 and the waterproof sheet 7. Good.

  Here, since the adhesive composition 4 of the present invention uses an aliphatic hydrocarbon solvent that does not dissolve the expanded polystyrene as a solvent, adhesion by the adhesive composition 4 without affecting the insulating material 2 made of expanded polystyrene. This makes it possible to fix the waterproof sheet 7 to the heat insulating material 2. Therefore, the waterproof sheet 7 can be firmly fixed by adhering the entire surface of the waterproof sheet 7 to the heat insulating material 2 with the adhesive composition 4. That is, since the waterproof sheet 7 can be fixed entirely rather than partially fixing it using a disk plate and an anchor, the fixed part of the waterproof sheet 7 is broken and peeled off from the base 1 in strong winds or the like. It is possible to prevent this. In addition, since the adhesive composition of the present invention contains an elastomer, both the adhesiveness to the heat insulating material 2 made of expanded polystyrene and the adhesiveness to the rubber waterproof sheet 7 are good. It can be bonded to the heat insulating material 2 made of expanded polystyrene with high adhesive strength.

  Next, the present invention will be specifically described with reference to examples.

(Examples 1-5 and Comparative Example 1)
Butyl rubber (“Nippon Butyl 268” manufactured by Nippon Synthetic Rubber Co., Ltd.) as an elastomer, petroleum resin (“High Resin 90” manufactured by Toyo Chemical Co., Ltd.) as a tackifier, and dioctyl phthalate (manufactured by J-Plus Co., Ltd.) as a plasticizer ), Light calcium carbonate (manufactured by Maruo Calsim Co., Ltd.) as an extender, normal heptane (manufactured by Cosmo Oil Co., Ltd.) as an aliphatic hydrocarbon solvent, and industrial gasoline (Japan Energy ( The adhesive composition was obtained by mix | blending and mixing by the compounding quantity of Table 1 using each.

The adhesive composition obtained as described above was tested for the solubility of expanded polystyrene. In the test, the adhesive composition was applied to the surface of a foamed polystyrene heat insulating material at a coating amount of 1000 g / m ² , and the surface of the foamed polystyrene heat insulating material after being allowed to stand for 60 minutes was not melted. The case was evaluated as “◯”, the case where the surface was slightly melted, “△”, and the case where the surface was largely melted was evaluated as “x”.

In addition, the adhesive composition obtained as described above is applied to the surface of the heat insulating material made of polystyrene foam at a coating amount of 200 g / m ² , and a rubber waterproof sheet is stacked on the heat insulating material. A waterproof sheet was adhered. Then, after leaving at room temperature for 7 days, after leaving at 80 ° C. for 7 days, and after leaving at 40 ° C. for 7 days, the adhesive strength of the waterproof sheet was measured by performing a 180 ° peeling test.

  As seen in Table 1, it is confirmed that the adhesive composition of each example does not attack the heat insulating material made of expanded polystyrene and is excellent in adhesiveness. Further, in Examples 4 and 5 in which the ratio of industrial gasoline in the solvent was high, the heat insulating material made of expanded polystyrene might be slightly affected, and the adhesive force was slightly low.

The structure of heat insulation waterproofing construction is shown, (a) (b) is sectional drawing, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Groundwork 2 Polystyrene heat insulating material 6 Adhesive composition 7 Rubber waterproof sheet

Claims (4)

  In a heat insulating waterproofing method in which a waterproof sheet made of rubber is attached to a base via a heat insulating material made of expanded polystyrene, an adhesive composition for expanded polystyrene used for bonding the waterproof sheet to the heat insulating material, the elastomer being 100 mass An adhesive composition for expanded polystyrene comprising 10 to 80 parts by mass of a tackifier and 300 to 800 parts by mass of a solvent comprising at least an aliphatic hydrocarbon solvent.   As the solvent, a first solvent composed of the above aliphatic hydrocarbon solvent and a second solvent composed of at least one of an aromatic hydrocarbon solvent and an alicyclic hydrocarbon solvent are blended. 2. The adhesive composition for expanded polystyrene according to claim 1, wherein a mass ratio of the solvent / second solvent is in a range of 90/10 to 60/40.   The adhesive composition for expanded polystyrene according to claim 1 or 2, wherein 5 to 30 parts by mass of a plasticizer is blended with 100 parts by mass of the elastomer. The adhesive composition for expanded polystyrene according to any one of claims 1 to 3, wherein 1 to 100 parts by mass of an extender is blended with 100 parts by mass of the elastomer.

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