JP2008273123A - Laminated body and heat-insulating sheet, and laying method for polystyrene-based foaming body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a laminated body using a polystyrene based foaming body which is superior in heat-insulating property, and in addition, has less deterioration with time in the heat-insulating property after being laid, and to provide a heat-insulating sheet using the laminated body, and a laying method for the polystyrene based foaming body and so forth. <P>SOLUTION: This laminated body includes the polystyrene based foaming body as a constituent member, and a layer containing a water dispersion type adhesive is laminated on one of the surfaces of the polystyrene based foaming body. The water dispersion type adhesive contains a hardening accelerator, and the hardening accelerator contains a film formation assisting agent of which the boiling point is 150°C or higher and/or a water absorbing agent. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

The present invention relates to a laminate for a heat insulating sheet, a heat insulating sheet, and a heat insulating method using them, and more specifically, the use of a polystyrene-based foam as a heat insulating material, which has been conventionally difficult. The present invention relates to a heat insulating laminate, a heat insulating sheet, and a heat insulating method.

In recent years, the demand for the use of heat insulating materials has been increasing both indoors and outdoors due to the demand for energy saving, and more excellent heat insulating materials have been demanded.
Among them, the use of foam is increasing as a heat insulating material laminated on concrete and other mortars.

Polyethylene foam is often used for foam, and this has flexibility, so it can absorb unevenness of the surface to be laid when laying, and has the advantage of quick installation, while flexibility is In addition to the risk of deformation after laying, there are drawbacks such as being dangerous at the time of laying work, inadequate thermal insulation effect, and the price being quite high.

Examples of the foam having excellent heat insulating properties include polyurethane-based foams, but they have a drawback that they are vulnerable to moisture and the deterioration over time of the heat insulating performance after laying is severe.

A heat-insulating property is higher than that of a polyethylene-based foamed sheet, and a polystyrene-based foamed sheet is an example of a material that has little thermal deterioration over time even after laying. Polystyrene foam sheets have low water absorption and moisture permeability, high compressive strength, and above all, although they have the advantage of being considerably cheaper than polyethylene, they are vulnerable to organic solvents and are dependent on adhesives. Due to the decisive difficulty of not being able to laminate, there was no other way to use it in a laminated body for thermal insulation than by mechanical fixing using a disk or an anchor. This is because most of the adhesives for heat insulating sheets so far have been solvent-based.

On the other hand, there are an aqueous dispersion adhesive having a high boiling point film forming auxiliary (Patent Document 1) and an adhesive made of an aqueous dispersion emulsion using a resin emulsion curing accelerator containing a metal oxide or the like (Patent Document 2). Although known, these are for increasing the drying speed of the adhesive when a waterproof sheet such as vulcanized rubber is laid directly on concrete or the like by a curing accelerator such as a film forming aid, About adhesiveness with a polystyrene laminated body, it was not known at all.

JP 2004-300727 A JP 2005-89723 A

As a result of intensive studies to solve the above problems, the present inventor has found that a layer containing a water-dispersed adhesive containing a curing accelerator or the like does not dissolve polystyrene and is sufficient with polystyrene. The present invention has been found to be capable of exhibiting excellent adhesiveness, and the object of the present invention is to provide excellent heat insulation, little decrease in heat insulation after laying, and adhesion to polystyrene foam. An object of the present invention is to provide a laminate that is excellent and has no fear of peeling or deformation, a heat insulating sheet using the laminate, a method for laying a polystyrene foam, and the like.

The above object can be achieved by the following first to ninth inventions.

<First invention>
A laminate comprising a polystyrene foam as a constituent member, wherein the following (A1) layer is laminated on the polystyrene foam.
(A1) Layer containing water-dispersed adhesive

<Second invention>
The laminate according to the first invention, wherein the water-dispersed adhesive contains a curing accelerator.

<Third invention>
The laminate according to the second invention, wherein the curing accelerator contains the following (1) and / or (2).
(1) Film forming aid having a boiling point of 150 ° C. or higher
(2) Water absorbent

<Fourth Invention>
A sheet having water shielding properties is laminated directly or via the following (A2) layer on the side of the (A1) layer that is not in contact with the polystyrene foam. The laminate according to any one of the three inventions.
(A2) A layer having adhesiveness.

<Fifth invention>
The laminate according to the fourth invention, wherein a finishing material layer is further laminated on the side of the sheet having water-impervious property that is not in contact with the (A1) layer.

<Sixth invention>
Any one of the first to fifth inventions characterized in that the following (B) layer is further laminated on the surface of the polystyrene foam surface opposite to the surface on which the (A1) layer is laminated. The laminated body of crab.
(B) Layer containing an aqueous dispersion adhesive containing an asphalt component

<Seventh invention>
(B) The laminate according to any one of the first to sixth inventions, wherein a primer layer is further laminated on the surface of the layer not contacting the polystyrene foam.

<Eighth invention>
A heat insulating sheet comprising the laminate according to any one of the first to seventh inventions as a constituent member.

<Ninth Invention>
The laminate or the heat insulating sheet according to any one of the first to eighth inventions is laid so that the (B) layer or the primer layer laminated on the (B) layer is in contact with the laying surface. A method for laying polystyrene foam.

The method of laying a laminate, a heat insulating sheet, and a polystyrene foam according to the present invention enables use of a polystyrene foam as a heat insulating material, which has been impossible in spite of high demand. In addition, it is possible to provide a laminated body having high heat insulation and little deterioration with time of heat insulation, a heat insulating sheet using the same, a method of laying a polystyrene foam, and the like.

[Laminated body of the present invention]
The laminate of the present invention is a laminate comprising a polystyrene foam and the following (A1) layer as constituent members.
(A1) Layer containing water-dispersed adhesive

The “laminate” as used in the present invention means a structure in which adjacent constituent members are bonded together without being easily peeled off.

Hereinafter, the laminated body of this invention is demonstrated for every structural member.

<< Polystyrene foam used in the laminate of the present invention >>
As the “polystyrene foam” used in the laminate of the present invention, known ones can be used. For example, the polystyrene foam is produced by the method described in the claims of Japanese Patent Application Laid-Open No. 2007-100015 and the column of the prior art. Specifically, it can be manufactured as follows.

As a raw material, a polystyrene resin and a foaming agent are mainly used.

“Polystyrene resin” that can be used as a raw material of the polystyrene foam of the present invention is not particularly limited. In addition to polystyrene polymerized using only styrene as a monomer, those using other monomers as monomer units And copolymers using styrene and other monomer units.
Specifically, for example, styrene homopolymer such as poly-p-methylstyrene, styrene-maleic anhydride copolymer, styrene-methacrylic acid copolymer, styrene-acrylic acid copolymer, styrene-butadiene copolymer. Polymers, styrene-acrylonitrile copolymers, styrene monomers and vinyl monomers or divinyl monomers, olefin monomers alone and copolymer resins, styrene-butadiene copolymer resins, etc. Examples thereof include a polymerization resin, a mixture of polystyrene and polyphenylene oxide, and the like.

Examples of the blowing agent include, but are not limited to, lower aliphatic hydrocarbons such as butane and pentane, halogenated hydrocarbons, and the like.

In order to produce polystyrene foam, for example, liquefied raw materials, foaming agents and flame retardants are mixed well under high temperature and high pressure, and blown into a normal atmospheric pressure / temperature environment at a stretch. And a so-called extrusion method in which this is cut into a plate having a required size.
Also, a so-called bead method in which a polystyrene bead having a diameter of about 1 mm is impregnated with a foaming agent, and the temperature is raised by, for example, applying a high-temperature steam of 100 ° C. or more to soften the resin and vaporize the foaming agent. And so on.

However, when used for the laminate of the present invention, those produced by an extrusion method (XPS) are preferred.

In addition, plate-like XPS is classified into JIS A 9511 standard classification, 1 type (a, b), 2 types (a, b) and 3 types depending on differences in thermal conductivity, bending strength, compressive strength, etc. Although there are six types (a, b), “three types b” expressed as “A-XPS-B-3b” and the like are preferable as those used in the present invention.

In XPS, a skin layer is formed, but the presence of a skin layer is preferable in that the surface is hard and the protective effect is large. When the skin layer is cut and used, the moisture permeability coefficient and water absorption rate are preferred. Is preferable in that the deformation risk of polystyrene is smaller.

The size, thickness, etc. of the polystyrene-based foam can be adjusted freely as needed, and are not limited at all.For example, when used as a part of a heat insulating sheet such as mortar, For example, it is preferable that the length and width are each 300 mm to 3,000 m, and the thickness is about 1 to 100 cm. Usually, from the ease of handling, the length is 3 to 6 (= 910 to 1,800 mm), The thickness is preferably about 2 to 75 cm, and in particular, the vertical, horizontal 3 to 6 (= 910 to 1,800 mm), and the thickness 2 to 20 cm is preferable.

<< (A1) Layer Used in Laminate of Present Invention >>

<Components of (A1) layer: water-dispersed adhesive>
The water-dispersed adhesive used in the (A1) layer of the laminate of the present invention is an adhesive composed of a suspended aqueous solution obtained by polymerizing a solid content of a polymer in water. Water-dispersed adhesives can also be a latex adhesive (rubber latex) mainly composed of colloidal natural or synthetic rubber, or polymers that are not inherently soluble in water can be emulsified with protective colloids and dissolved in water. It is classified as an emulsion-based adhesive (resin emulsion) or the like that is ready for use.

These water-dispersed adhesives exhibit adhesiveness when the solvent is vaporized and the solute is fused and cured.

The reason why these water-dispersed adhesives are used is that there is no possibility of dissolving the polystyrene foam to be bonded unlike the conventional solution-based adhesives using organic solvents.
“Solution-based adhesives with organic solvents” are those in which polymer solids such as synthetic resins and rubbers are dissolved in solvents such as water, alcohol and organic solvents.

((Dispersoid of water-dispersed adhesive))
"Dispersoids of water-dispersed adhesives" include ethylene / vinyl acetate copolymer, ethylene / vinyl acetate / acrylic acid ester copolymer, ethylene / vinyl acetate / methacrylic acid ester copolymer, polystyrene / acrylic acid ester Copolymer, polystyrene / methacrylic acid ester copolymer, chloroprene, chloroprene copolymer, styrene / butadiene copolymer, vinyl acetate / acrylic acid ester, vinyl acetate / methacrylic acid ester, styrene / acrylic acid ester, styrene / methacrylic acid Acid ester etc. are mentioned.

For water-dispersed adhesives, air entraining agent (referred to as air entraining agent, hereinafter abbreviated as AE agent), AE water reducing agent, tackifier, thickener, antifoaming agent, antiseptic, anti-freezing agent Other components such as can be added.

In addition, when the sheet having water-proofing property laminated on the polystyrene foam through the layer having an adhesive is an asphalt-based sheet as described later, the water-dispersed adhesive is ethylene / acetic acid. A waterproof composition obtained as an asphalt obtained by heating and melting a vinyl copolymer emulsion or a synthetic resin of a styrene / butadiene copolymer emulsion is suitable.

((Effect of water-dispersed adhesive))
The water-dispersed adhesive obtained in this way is one in which the emulsion particles become densely packed with time as the water evaporates, and further, the particles deform and fuse together to form a continuous phase and harden. It is.

((Example of water-dispersed adhesive))
As the water-dispersed adhesive of the present invention, when laminating a water shielding sheet such as a vulcanized rubber sheet, the water-dispersed adhesive for sticking includes acrylic, ethylene vinyl acetate, and chloroprene-based water. A dispersion type adhesive is mentioned as a preferable thing. In particular, the trade name “Gorex Bond” (manufactured by Iwao Co., Ltd.) is suitable as a chloroprene-based water-dispersed adhesive.

((Components of water-dispersed adhesive: curing accelerator))
The water-dispersed adhesive used as a component of the (A1) layer of the present invention preferably further contains a curing accelerator.
((Effect of curing accelerator))

By including a curing accelerator in the water-dispersed adhesive, the familiarity with the (A2) layer laminated on the water-shielding sheet is improved, and the polystyrene foam and the sheet are bonded. In addition to dramatically improving the performance and eliminating the need for peeling between the water-proof sheet and the polystyrene foam, the curing of the adhesive is accelerated, the laminating work progresses faster, and the entire laying work speeds up. Because it is connected.

((Components contained in curing accelerator))
Examples of the film forming aid contained in the curing accelerator include the following (1) and / or (2).
(1) Film forming aid having a boiling point of 150 ° C. or higher
(2) Water absorbent

The water-dispersed adhesives containing these curing accelerators can be produced, for example, by the method described in JP-A-2004-300727 and (2) in JP-A-2005-89732. However, it is specifically manufactured as follows, for example.

(1) Film-forming auxiliary having a boiling point of 150 ° C or higher The film-forming auxiliary (1) having a boiling point of 150 ° C or higher, which is contained in the curing accelerator, is water and water-dispersed adhesion. It is a liquid substance having affinity or compatibility with both rubber and resin which are adhesive components of the agent.

(Types of film forming aids having a boiling point of 150 ° C. or higher)
The film forming aid having a boiling point of 150 ° C. or higher is not particularly limited as long as it is a liquid substance having such properties, but cellosolve such as methyl cellosolve, ethyl cellosolve, butyl cellosolve and carbitol, ethylene glycol, diethylene glycol, etc. In addition to monoethers, glycols such as propylene glycol and sorbitol, and polyhydric alcohol ethers are preferably used.
Among them, 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, 2,2,4-trimethyl-1,3-pentanediol mono, which has excellent compatibility with rubbers such as chloroprene rubber Isobutyrate can be used particularly preferably.

By including a film forming auxiliary having a boiling point of 150 ° C. or higher in the water-dispersed adhesive, the film forming auxiliary is compatible with the dispersoid of the water-dispersed adhesive and softens it, The fusion of the dispersoid of the water-dispersed adhesive accompanying the evaporation of water is promoted to enable uniform drying / film formation.
In addition, a film forming aid having a boiling point of 150 ° C. or higher relaxes the formation of the surface film and enhances the tackiness of the adhesive layer after drying.

(Content of (1) film forming aid)
The content of the film forming auxiliary (1) in the curing accelerator is not particularly limited, and is, for example, 50 to 99% by mass.

The film-forming auxiliary having a boiling point of (1) of 150 ° C. or higher is preferably changed in content in the water-dispersed adhesive depending on the construction environment temperature when the water-dispersed adhesive is used.

In the case of a low temperature type used for construction at a low temperature (less than 15 ° C.), as a film forming auxiliary component having a boiling point of 150 ° C. or higher with respect to 100 parts by weight of the water-dispersed adhesive having a solid content of 40 to 60% by mass. The content is preferably 13 to 20 parts by weight, more preferably 13 to 18 parts by weight.

In the case of a general type used for construction at room temperature (15 ° C. to less than 25 ° C.), a film forming aid having a boiling point of 150 ° C. or higher with respect to 100 parts by weight of the aqueous dispersion adhesive having a solid content of 40 to 60% by mass. The agent is preferably contained in an amount of 6 to 16 parts by weight, more preferably 8 to 12 parts by weight.

In the case of a high-temperature type used for construction at high temperature (25 ° C. or higher), as a film forming auxiliary component having a boiling point of 150 ° C. or higher with respect to 100 parts by weight of the aqueous dispersion adhesive having a solid content of 40 to 60% by mass. , Preferably 2 to 7 parts by weight, more preferably 3 to 6 parts by weight.

The film forming aid having a boiling point of (1) of 150 ° C. or higher is capable of uniform drying / film formation, surface film formation, tackiness, and reliable initial adhesion performance. The content is preferably more than the lower limit. In addition, the action of the film forming aid as a softening agent for the adhesive can be moderately maintained and the mechanical strength of the adhesive itself can be maintained, and the adhesiveness of the adhesive surface is moderate and the worker can easily walk. The content is preferably less than the upper limit of the content.

(Effect of (1) film forming aid)
The film-forming aid having a boiling point of (1) of 150 ° C. or higher has compatibility with the water-dispersed adhesive, and is applied to the sheet in advance, for example, when laminating sheets having a water barrier property, The adhesive contained in the layer (A2) described later has compatibility with an adhesive component such as chloroprene rubber, and this effect softens the adhesive component such as chloroprene rubber and develops adhesive performance. Also contribute.

(Other components contained in (1) curing accelerator)
In addition, it is preferable to add a filler to a high temperature type for the purpose of reducing the excessive adhesiveness which generate | occur | produces on the surface after adhesive drying at the time of high temperature. As the filler that can be used, inorganic materials known in this technical field, such as clay, calcium carbonate, and talc, can be preferably used.
The filler is preferably added in an amount of 5 to 35 parts by weight with respect to 100 parts by weight of the water-dispersed adhesive having a solid content of 40 to 60% by mass.

The water-dispersed adhesive composition of the present invention using a curing accelerator containing a film-forming auxiliary having a boiling point of 150 ° C. or higher in (1) is further improved in storage stability and application workability during construction. For the purpose of adjustment, known thickeners / fillers can be appropriately added. Moreover, a well-known antifoamer and antiseptic | preservative can be added suitably as needed.

(2) Water-absorbing agent (type of (2) water-absorbing agent)
The water-absorbing agent (2) is preferably an oxide of a metal such as calcium that reacts immediately with water to form a hydroxide. In addition, an oxide of a metal such as magnesium or barium can be used. In particular, it is preferable to use calcium oxide (CaO).

(Content of (2) water-absorbing agent)
The water-absorbing agent is generally preferably 20 to 50% by mass, more preferably 25 to 45% by mass, based on the total amount of the curing accelerator. When the water-absorbing agent is 20% by mass or more, for example, it compensates for the lack of water-absorbing effect in water in the water-dispersed adhesive, and is easy to dry and harden. This is preferable because it does not require much time to be applied. Further, when the water-absorbing agent is 50% by mass or less, for example, in the laying method of the laminate or the heat insulating sheet of the present invention, the drying and curing are slow, so that the time required for the coating operation can be sufficiently secured, and the adhesive necessary for the tension Therefore, it is suitable for bonding a polystyrene foam or a sheet having a water barrier property.

(Effect of (2) water-absorbing agent)
By containing this water-absorbing agent, the layer containing the water-dispersed adhesive greatly accelerates the curing speed on the lamination surface side, and thereby the surface side that is easy to proceed with drying / curing and the layer that is difficult to dry and does not proceed with curing. The difference in the curing rate of the water dispersion adhesive on the surface side can be made uniform. As a result, the (A1) layer containing the water-dispersed adhesive is quickly dried and cured after laying even at low temperatures of less than 15 ° C., such as in winter, or in an environment with poor drying and curing conditions such as indoors. be able to.

(Other components included in the curing accelerator)
The curing accelerator including a water absorbing agent contains process oil as necessary, and appropriately contains a filler and the like.

This process oil is used when the reaction between the water-absorbing agent (metal oxide) and the water in the adhesive is too early when the curing speed of the water-dispersed adhesive on the laminated surface side is accelerated by the water-absorbing agent described above. In order to appropriately control the reaction between the water-absorbing agent and water, it may be contained if necessary.

The filler can be contained for the purpose of increasing the viscosity for improving the storage stability of the curing accelerator. In this case, it is preferable to contain a known inorganic filler such as calcium carbonate.

(Content of (2) curing accelerator)
The content of the curing accelerator containing the water-absorbing agent (2) in the water-dispersed adhesive is determined by the amount of water-absorbing agent necessary for the water content in the water-dispersed adhesive. That is, in the case of a curing accelerator containing 20 to 50% by mass of a water-absorbing agent, the water content in 100 parts by mass of the water-dispersed adhesive is preferably 10 to 25 parts by mass with respect to 45 parts by mass. Furthermore, it is preferable to contain 15 to 22 parts by mass of a curing accelerator, and it is particularly preferable to contain 20 parts by mass of a curing accelerator. When the water content in 100 parts by mass of the water-dispersed adhesive is more than 45 parts by mass, the curing accelerator may be contained in an amount of 25 to 50 parts by mass, and when less than 45 parts by mass, the curing accelerator is 5 to 10 parts. You may make it contain a mass part.

A curing accelerator is added to the water-dispersed adhesive immediately before application at the construction site, and the mixture is uniformly stirred and mixed by a known method to obtain a final water-dispersed adhesive composition for application. When the curing accelerator is contained, the content can be made suitable in consideration of the temperature.

Curing accelerator containing (1) and (2) (Combination effect of (1) and (2))
As a curing accelerator, a film-forming auxiliary having a boiling point of (1) of 150 ° C. or higher and a water-absorbing agent (2) are used in combination, and the effect of promoting the curing by (1) and laminated on the back of the sheet beforehand. (A2) It is preferable at the point that the effect which raises the adhesiveness at the time of dry tack with a layer, and the drying and hardening acceleration | stimulation effect of the layer containing an aqueous dispersion type | system | group adhesive agent by (2) can be show | played together.

(Content of film forming aid (1) when used in combination)
The film-forming auxiliary is generally preferably 40 to 75% by mass, more preferably 45 to 70% by mass, based on the total amount of the curing accelerator.

(Content of water absorbing material (2) when used in combination)
The content of the water-absorbing agent (2) is preferably finally determined in relation to the amount of water in the water-dispersed adhesive, but the content in the curing accelerator is (1) and As described above, the content is usually 20 to 50% by mass, and more preferably 25 to 45% by mass.

((Method for producing curing accelerator))
As a method for producing the curing accelerator (1) or (2), a water-absorbing agent, a film-forming aid, and if necessary, each component such as a process oil, a thickener and a filler are blended, and a general stirring device is used. The method of mixing and stirring by the method used is mentioned.

<(A1) Layer Component: Other Components>
As the (A1) layer of the present invention, the above-mentioned water-dispersed adhesive can be used as it is, but other adhesives, solvents, and various additions are appropriately added within the range not impairing the adhesiveness. An agent or the like may be included.
For example, when the “water-proof sheet” laminated on the (A1) layer directly or via the following (A2) layer is an asphalt-based sheet, the adhesion with the asphalt sheet is improved. Therefore, it may contain an asphalt component.

<Effect of (A1) layer>
By using the (A1) layer containing the water-dispersed adhesive used in the present invention, it is possible to form a sheet having water-imperviousness described later without dissolving or deforming the polystyrene foam like a solvent-based adhesive. Can be easily combined in a short time.

The (A2) layer adhesive containing the water-dispersed adhesive used in the present invention has a (A2) layer adhesive when a sheet having water shielding properties is laminated on the (A2) layer. Has the effect of promoting the softening of the resin and ensuring good initial adhesive strength between the polystyrene foam and the sheet.

Furthermore, if a layer containing this water-dispersed adhesive is used, there is no need to further apply a primer layer or the like between the adhesive layer and the polystyrene foam, so there is an advantage that the bonding operation is easy. is doing.
However, in the laminate of the present invention, it is not excluded to laminate a primer layer between the polystyrene foam and the (A1) layer.

<Lamination amount of (A1) layer>
The lamination of (A1) layer is preferably about 0.05 to 0.5 / m ^2, and more preferably from between 0.1 and 0.3 kg / m ^2.

<(A1) Layer Lamination Method>
(A1) As a method of laminating a layer, a well-known method is mentioned, Application | coating with a brush, a roller, spraying, etc. are mentioned.
The (A1) layer may be laminated on a polystyrene-based foam. However, when a sheet having water barrier properties is further laminated on the (A1) layer, the (A1) layer is first placed on the sheet. After laminating, a polystyrene foam may be immediately laminated.
In addition, the (A1) layer is laminated on a polystyrene foam, the (A1) layer or other adhesive layer is laminated on a sheet having a water-impervious property, and laminated by dry tack or the like at the construction site after each application. It doesn't matter.

<< The sheet | seat which has the water impermeability used for the laminated body of this invention >>
The sheet having water barrier properties used in the laminate of the present invention is laminated directly or via the following (A2) layer on the side of the (A1) layer that is not in contact with the polystyrene foam.

<Sheet with water barrier>
((Type of sheet having water-impervious properties))
The water-proof sheet used in the laminate of the present invention is a JIS A6008 synthetic polymer roofing sheet having waterproof properties such as ethylene propylene diene rubber (hereinafter abbreviated as EPDM), butyl rubber or chlorosulfonated polyethylene. In addition to the specified vulcanized rubber sheet, impregnated and coated with asphalt or asphalt modified with synthetic rubber or resin, etc. on base paper made of organic natural fiber or nonwoven fabric made mainly of organic synthetic fiber Covered asphalt roofing (waterproof sheet using asphalt) and the like can be mentioned, and the thickness is not particularly limited, but for example, a thickness of about 1 to 3 mm is suitably used.

Examples of asphalt roofing include stretch asphalt roofing felt defined in JIS A 6022, modified asphalt roofing sheet defined in JIS A 6013, and the like.

((Effect of sheet having water barrier property))
After laying the laminated body, this sheet having water-impervious properties blocks moisture from the outside of the laminated body, imparts waterproof performance to the laying surface, and prevents moisture from polystyrene as a heat insulating material. It also has the effect of preventing deformation.

((Method for laminating sheets having water-proofing properties))
Moreover, as a method of laminating a sheet having water shielding properties on the (A1) layer,
(1) A method of immediately laminating a sheet having water shielding properties after laminating the (A1) layer on the surface of the polystyrene foam (2) Before transporting to the construction site, in advance in the factory under the ground side of the sheet After applying and drying the (A2) layer containing an adhesive, a film made of polyethylene or the like was laminated and wound into a roll (pre-coated sheet) was laminated on the polystyrene foam surface at the construction site. (A1) By temporarily placing the film on the layer, aligning, peeling off the film, attaching it, and rolling it with a tool such as a rubber roller (dry tack), the (A1) layer and ( A2) Method of laminating layers by blending (3) Method of laminating (A1) layer on the sheet side instead of polystyrene foam and immediately laminating on polystyrene foam There is, although the stacking order and laminating method is not particularly limited, (2) is preferred.

In the case of the methods (1) and (3), as a sheet having water-impervious properties, it is difficult to cause problems such as swelling (floating) of the sheet due to water vapor evaporated from the adhesive before drying. It is preferable to use one containing asphalt.

<(A2) layer>
(((A2) layer type))
In the case of (2), the same water-dispersed adhesive as that of the (A1) layer may be used for the (A2) layer, which is previously applied to the sheet as necessary. Alternatively, a general solvent-based adhesive can also be used.
When the “water-proof sheet” is an asphalt sheet, it may contain an asphalt component in order to improve adhesion to the asphalt sheet.

In the case of the (A2) layer, a solvent-based adhesive can also be used because, unlike the (A1) layer, since it is not directly laminated on the polystyrene foam side, there is no concern about the dissolution of polystyrene. This is because the organic solvent that dissolves polystyrene has already been volatilized in order to dry before laminating the film.

In addition, in the case of a solvent system, there is an advantage of drying and curing at an early stage, but in the case of an aqueous dispersion system, an organic solvent is not used or even if it is used, it is only included in part as a curing accelerator. Therefore, it is preferable in that the suction of the organic solvent during work is small.

(((A2) layer stack)))
The amount of the (A2) layer is preferably about 0.03 to 2.0 kg / m ^{2, and} more preferably 0.05 to 1.0 kg / m ² .

(((A2) layer stacking method))
Examples of the method of laminating the (A2) layer on a sheet having water shielding properties include known methods such as application with a brush or a roller, spraying, etc., but application with a brush or a roller is preferred.
When the (A2) layer is not laminated immediately after the layer (A1), it is dried, covered with a polyethylene film or the like, wound up in a roll shape, and carried to the construction site.

((Effect of (A2) layer))
In the case where the (A1) layer laminated on the polystyrene foam side of the present invention uses the film-forming aid having the above-mentioned (1) boiling point of 150 ° C. or higher as the curing accelerator, this layer is once dried (A2 ) It has the effect of promoting the softening of the adhesive in the layer and ensuring good initial adhesive strength between the polystyrene foam and the sheet.

<< Finish material layer used in the laminate of the present invention >>
<Types of finishing material>
The finishing material layer used in the laminate of the present invention is a layer containing a finishing material such as an aqueous emulsion such as paint.
In order to block out heat from the sun and the like, specific examples of the finishing material include paints such as silver, gray and light gray.
As a coloring pigment / pigment contained in the finishing material, known ones can be used. For example, aluminum powder or the like is used for silver.

As the finishing material contained in the finishing material layer, a known paint or the like can be used, and for example, it can be purchased as GX color (manufactured by Iwao Co., Ltd.).

The finishing material layer can contain other components in addition to the components contained in the so-called finishing material as long as the effects of the finishing material are not impaired.

<Lamination amount of finishing material layer>
The lamination amount of the finishing material layer is preferably about 0.15 to 1.0 kg / m ^{2, and} more preferably 0.25 to 0.6 kg / m ² .

<Lamination method of finishing material layer>
Examples of the method for laminating the finishing material layer include known methods, such as application with a brush or a roller, spraying, etc., and application with a roller is preferred.
Lamination is performed on the side of the water-impervious sheet that is not in contact with the (A1) layer.

<Effect of finishing material>
This finishing material layer is located outside the sheet having water-impervious properties, and is a layer that plays a role of protecting the sheet, improving weather resistance, improving the waterproof performance of the sheet, and the like. In addition to improving waterproof performance, it has the effect of blocking heat from the outside, such as the sun, controlling the temperature of the laminate to an appropriate range, and preventing deformation of polystyrene.

In particular, when the finishing material layer is painted in a color tone such as silver, gray, or light gray, the heat insulating effect can be enhanced and the deterioration of polystyrene can be prevented.
Moreover, since the temperature of polystyrene can be easily maintained in a preferable state of 70 ° C. or less by preventing the temperature rise from the outside, there is an advantage that the risk of deformation (blurring) of polystyrene is particularly reduced.
In addition, this finishing material layer also plays a role as a protective material for a sheet having water-imperviousness.

<< (B) layer used for laminated body of this invention >>
The layer (B) of the laminate of the present invention is for bonding the polystyrene foam to a laying surface such as concrete.

<Components of layer (B): Adhesive>
These may be a composition as a resin emulsion alone or as a rubber asphalt emulsion mixed with asphalt melted by heat. For example, a modified asphalt emulsion obtained by mixing a styrene / butadiene copolymer emulsion (hereinafter abbreviated as SBR emulsion) and molten asphalt by a known method is mentioned. Generally, 100 parts by mass (solid content) of SBR emulsion It is obtained by mixing and stirring 100 to 1200 parts by mass of asphalt heated and melted in the presence of an emulsifier and a dispersant. In that case, the water content is preferably 8 to 45% with respect to the total mass part of the resin emulsion and asphalt.
Among them, a waterproof composition obtained as an asphalt obtained by heating and melting an ethylene / vinyl acetate copolymer emulsion or a styrene / butadiene copolymer emulsion synthetic resin is preferable.

<Components of layer (B): other components>
This B layer can appropriately contain a known additive as long as the effect of the adhesive contained in the B layer is not impaired.

<Effect of layer (B)>
The layer (B) forms a moisture-proof coating film, prevents moisture from the laying surface of the laminated body such as concrete, and plays a role of preventing a decrease in the heat insulation performance of the polystyrene foam.

<Lamination amount of (B) layer>
The amount of the (B) layer varies depending on the degree of unevenness on the surface on which the laminate is laid, and cannot be generally specified, but is preferably about 0.1 to 3 kg / m ² , and more preferably 0.2. it is a ~1.0kg / m ^2.

<(B) Layer Lamination Method>
(B) As a method of laminating | stacking a layer, a well-known method is mentioned, Application | coating with a brush, a roller, etc., spray spraying, etc. are mentioned.
Lamination may be performed on a polystyrene foam, but after applying the (B) layer on the laying surface or a primer layer (described later) applied to the laying surface in advance, the polystyrene foam is applied. As described later, the lamination is preferable because the unevenness of the laying surface can be absorbed by the thickness of the layer (B).
Further, the layer (B) may be laminated after being applied to both the polystyrene foam and the primer layer (described later) applied to the installation surface or the installation surface.

Here, as a method of laminating the layer (B) on the laying surface of the laminate, the surface of the polystyrene-based foam, or a primer layer described later, a known method can be adopted, and application by a brush or a roller, Spray spraying etc. can be mentioned, but if it is applied so that a mountain valley is formed with square eyes, comb eyes, etc., the layer (B) can be given a certain amount of thickness with a small amount, and the unevenness of the laid surface can be uneven. Since it can absorb, it is preferable.

In addition, as described in FIG. 1, by pressing the polystyrene foam, the crest portion of the layer (B) is crushed and expanded, and a moisture-proof coating film can be formed on the back surface of the polystyrene foam.

At this time, the ratio of the adherence surface of the moisture-proof coating film by the (B) layer of the polystyrene foam is preferably 15% or more with respect to the area of the polystyrene foam on which the (B) layer is laminated. Preferably, it is 18% or more, particularly preferably 20% or more.

This is because uniform lamination at this ratio can withstand wind loads calculated based on a reference wind speed (for example, a maximum wind speed of 46 m / sec) and has an advantage of being difficult to peel off after lamination.

<< Primer layer used in the laminate of the present invention >>
The primer layer used in the laminate of the present invention is the adhesion of the layer (B) to concrete, etc., in addition to the effect of removing dirt such as dust, such as concrete, on which the laminate of the present invention is laid. It is a layer containing a primer composition that has the effect of preventing the agent from being sucked and requiring a large amount of adhesive, and specific examples include the following.

<Types of primer composition>
The main component of the primer composition is rubber latex such as chloroprene rubber, styrene / butadiene rubber, and natural rubber, and synthetic resin emulsions such as polyvinylidene chloride, acrylic resin, and ethylene vinyl acetate, as well as adhesives. By using a latex or the like that has undergone carboxyl modification, the water resistance of the water-based primer and the mechanical strength of the resin itself are improved, and a stable primer layer can be formed.

<Other components in the primer layer>
Moreover, in order to supplement the initial adhesiveness after primer application and drying, a tackifier obtained by emulsifying rosin ester resin, terpene resin, petroleum resin or the like into a latex usually has a solid content of 40 to 60% by mass. About 30 to 70 parts by weight of a rubber latex or synthetic resin emulsion having a solid content of 45 to 65% by mass is blended with 100 parts by weight. The mixing ratio of the tackifier is higher than that of the adhesive, but the primer has a lower solid content than the adhesive and is intended to penetrate into the coating base. This is to prevent the applicability from decreasing.

<Concentration of primer composition>
Furthermore, as performance required for the primer composition, there are securing of paintability to the base and application workability. For this reason, in a primer composition, it is preferable to add the water as a solvent other than the water | moisture content of said compound, and to adjust the solid content density | concentration to about 15 to 40%.

In the present invention, since the primer composition is also aqueous, the drying rate is slow, but the solid content concentration is lower than that of the adhesive composition. Is unlikely to occur. However, when the solid content concentration is relatively high, uniform drying / film formation may be promoted by adding a film-forming aid having a high boiling point.

<Lamination amount of primer layer>
The lamination of the primer layer, preferably about 0.1~0.4kg / m ^2, and more preferably from 0.2~0.4kg / m ^2.

<Lamination method of primer composition>
As a method of laminating the primer layer, a known method can be mentioned, which is performed by applying with a brush or a roller or spraying.
It is not impossible for the primer layer to be laminated on the (B) layer laminated on the polystyrene foam, but in the first place the role of the primer layer is that the layer containing an adhesive such as the (B) layer is concrete or the like. The primer layer is pre-laminated on the object for laying the laminate of the present invention from the point of preventing it from penetrating into the object to be laid and playing the original role of the adhesive in a small amount. The laminate of the present invention is preferably laminated via the (B) layer.

<< Lamination method of laminate of the present invention >>
In addition, the laminated body of the present invention may be used as an integrated laminated body before laying, or may be laid so as to be sequentially stacked on the laying target, or only a part of the layers of the laminated body may be laid. A pre-integrated one can also be used, and can be selected at any time depending on the object to be laid, the status of the laying work, and the like.

In addition to the above, the laminate of the present invention can be used by further laminating another layer.

[Insulation sheet of the present invention]
The heat insulating sheet of the present invention includes the above-described laminate of the present invention as a constituent member.
The laminated body of the present invention may be used as it is as a heat insulating sheet, and another heat insulating member or the like may be further laminated to form the heat insulating sheet of the present invention.

In the case of using the laminate of the present invention in which sheets having water shielding properties are laminated as a constituent member of the heat insulating sheet, in addition to the heat insulating property, the highly useful heat insulating sheet having a high level of waterproofness, and can do.

<< Effect of Laminate of the Present Invention >>
This heat insulating sheet containing the laminated pair of the present invention as a constituent member has high heat insulating properties, little heat deterioration over time after laying, and there is no risk of peeling or deformation of the sheet from the polystyrene foam. It has extremely excellent performance that is not found in any polyethylene-based heat insulating material.

[Laying method of polystyrene foam of the present invention]
The method for laying a polystyrene foam of the present invention is the above-mentioned laminate or heat insulating sheet of the present invention so that the surface of the primer layer laminated to the (B) layer or the (B) layer is in contact with the application target. It is characterized by laying.

This laying order is the same as the method of manufacturing the laminated body, in addition to the method of laying the laminated body and the heat insulating sheet integrated before laying at the same time, even if laying by sequentially stacking on the laying target It is also possible to use a structure in which only a part of the layers of the laminate is integrated in advance, and it is possible to select at any time depending on the object to be laid, the status of the laying work, and the like.

When the surface to be laid has irregularities and the like and the laying surface is a non-uniform surface, it is preferable to apply the primer layer and / or the (B) layer in advance. When it is applied so that a mountain valley is generated with a ridge, a comb, etc., the layer (B) can have a certain thickness, can absorb surface variations due to unevenness of the laying surface, and the layer (B) This is preferable because the coating amount can be easily controlled.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated, this invention is not limited to these.

[Example 1]
In order to investigate the presence or absence of dissolution of polystyrene foam by a layer containing an aqueous dispersion adhesive containing a film forming aid having a boiling point of 150 ° C. or higher, the aqueous dispersion adhesive of Example 1 having the composition shown in Table 1 below was produced. did.
In the following test examples, the water-dispersed adhesive itself of Example 1 was used as the (A1) layer of the laminate of the present invention.

* 1 (Product name: Skyprene Latex GFL-820, manufactured by Tosoh Corporation)
* 2 (Product name: Superester E730-55, Arakawa Chemical Co., Ltd.)
* 3 (Product name: Adecanol UH-420, manufactured by Asahi Denka)
* 4 (Product name: CS-16, manufactured by Chisso Corporation, boiling point 280 ° C)

The following polystyrene foam was used as a target for laminating the water-dispersed adhesive of Example 1 above.

Polystyrene foam
JIS A9511 foam plastic insulation material, A type extrusion method polystyrene foam insulation material A-XPS-B-3b, both with and without skin layers.

[Comparative Example 1]
The high boiling point solvent itself used above was used as the adhesive of Comparative Example 1.

[Test Example 1: Polystyrene solubility test]
The presence or absence of dissolution was confirmed by placing 5 g of the adhesive of Comparative Example 1 directly on the polystyrene foam.
Next, 300 g / m ² of the water-dispersed adhesive of Example 1 was applied onto the polystyrene foam, and after touch-drying, the polyfilm was pressed against the adhesive surface, and the insulation was sealed together with the test. The body.
This was left for 30 days at room temperature and 80 ° C. Thereafter, the film was taken out and the polyfilm was peeled off to confirm the presence or absence of dissolution of the heat insulating material. The results are shown in Table 2.

From Table 2, when used alone as a high-boiling solvent, the polystyrene foam is dissolved, but the water-dispersed adhesive containing the high-boiling solvent does not dissolve polystyrene and is used for bonding polystyrene foam. It was found that can be applied to.

[Test Example 2: Adhesive performance confirmation test with polystyrene foam]
As the water-dispersed adhesive, the one used in Example 1 was used, and the polystyrene foam was also used in the following method using the same polystyrene foam as in Test Example 1 (with skin layer and without skin layer, both types). The adhesion performance between the polystyrene foam and the water-dispersed adhesive was confirmed.

On the polystyrene foam, the water-dispersed adhesive of Example 1 was brushed at 100 g / m ² to confirm dry touch.

In order to measure the adhesive strength of the water-dispersed adhesive to the polystyrene foam, a sheet (A2) having a water shielding property is previously formed on the water-dispersed adhesive layer ((A1) layer) laminated on the polystyrene foam. ) A sheet that conforms to the standard of JIS A6008 synthetic polymer roofing sheet (homogeneous sheet, vulcanized rubber system, 1.2mm thickness), coated with chloroprene solvent adhesive on one side and dried (A2) The layer was stretched so as to be in contact with the (A1) layer, and was subjected to one reciprocating rolling and lamination with a load of 49 N / 100 mm to prepare a test laminate.

The specimen was cured at room temperature or in an atmosphere of 80 ° C. for a predetermined period, the test specimen width was 1 inch, the sheet was peeled off at a tensile speed of 200 mm / min, the adhesive strength was measured, and the fracture site was also confirmed. The results are shown in Table 3.

As can be seen from Table 3, the breakage occurred in the heat insulating material itself before the sheet peeled off.
That is, the actual adhesive strength should be larger than the measured value, and considering this, the adhesion between the water-dispersed adhesive of Example 1 and the polystyrene foam is extremely good. I understand.

[Test Example 3: Confirmation of adhesive strength and stability of the base material]
(Test method)
The laminate of the present invention was laminated on a slate having a size of 25 cm × 50 cm and a thickness of 5 mm with the following specifications.
The polystyrene foam is bonded to two layers of 25cm x 25cm, 50mm thick side by side, with the (B) layer containing an asphalt component-containing water-dispersed adhesive, and the covering ratio of the adhesive side of the polystyrene foam to the base side of the polystyrene foam using a comb comb. The test specimens of the examples of the adhesive strength were pasted by changing (laminated body specifications in Table 4 below: (i) to (iii)).

After curing for 7 days at room temperature, the adhesion test was measured with a Kenken type tensile tester manufactured by Oxjack Co., Ltd.

Further, an adhesive (A1) layer, a sheet having waterproof properties (waterproof sheet), and a finishing material layer are sequentially laminated on the heat insulating material (laminated body specifications in Table 4 below: (iv) to (vi)). A laminate was obtained.
A cross-sectional view of this laminate is shown in FIG.

The entire periphery of the laminate was sealed with an epoxy resin, then immersed in water, treated in a 50 ° C. atmosphere for 30 days, the state was observed, and the stability of the shape was evaluated.

As in the case of Test Example 2, the waterproof sheet is laminated in advance using a sheet coated with chloroprene solvent-based adhesive on one side and dried as the (A2) layer, and the (A2) layer becomes the (A1) layer. This was done by tensioning in contact and rolling 1 reciprocating with a load of 49 N / 100 mm.

At the same time, instead of the layer (B), an adhesive with a proven track record for indoor use, which is a mixture of gypsum with an appropriate amount of water, is used as an adhesive for laminating polystyrene foam on the construction surface. This was used as a comparative example.

The results are shown in Table 5.

The evaluation in the table was performed according to the following criteria.

* Adhesive performance ◎ ... Good (Polystyrene foam layer destruction)
× ... Poor (adhesive / polystyrene foam layer destruction)

* Stable performance ◎ ・ ・ ・ Good
○ ・ ・ ・ Slightly deformed but usable ×× Large deformed, unusable

From the results shown in Table 5, when the adhesion ratio of the polystyrene foam with the adhesive (B) exceeds 20%, the polystyrene foam itself is destroyed and sufficient adhesion performance is obtained.
Further, the shape stability is slightly affected by moisture at 20%, and the appearance is slightly deformed, but there is no practical problem.
It can be seen that there is no deformation at all over 30%.

On the other hand, in the comparative example, the adhesive (B) adhered with gypsum has sufficient adhesion performance regardless of the adhesion ratio, but moisture migrates into the polystyrene foam through the gypsum, and deformation occurs. Therefore, it turned out that it is not applicable.

[Test Example 4: Wind pressure test]
When the adhesive area of the adhesive (B) layer in Test Example 3 is 20%, the adhesive strength is calculated based on the calculation formula of wind load (lift) established by the Ministry of Land, Infrastructure, Transport and Tourism. The bond strength of 0.22 exceeds the standard of the Okinawa area with the highest standard wind speed (Table 6 below), and the structure according to the present invention has a foundation fixing strength that can be applied to a building with a height of 50 m. I understood that.

Standard wind load (lift) value by the Ministry of Land, Infrastructure and Transport Okinawa area Standard wind speed 46m / s

In addition, instead of the “water-dispersed adhesive containing a film-forming aid having a boiling point of 150 ° C. or higher” in Example 1 as the water-dispersed adhesive (A1), “(1) film-forming aid” It was also found that even when the “water-dispersed adhesive containing the water-absorbing agent (2)” was used, the polystyrene was not dissolved and good adhesiveness could be exhibited.

The laminate and the heat insulating sheet of the present invention can be used for imparting heat insulating properties such as roofs, verandas, wall surfaces, and floors of buildings. In addition, in the case of a laminated body or a heat insulating sheet in which sheets having water shielding properties are laminated, it can also be used when waterproofing is given to a peripheral wall of a subway, a wall surface of a tunnel, and the like.

It is a figure showing sectional drawing of one mode of a layered product of the present invention.

Claims (9)

A laminate comprising a polystyrene foam as a constituent member, wherein the following (A1) layer is laminated on the polystyrene foam.
(A1) Layer containing water-dispersed adhesive The laminate according to claim 1, wherein the water-dispersed adhesive contains a curing accelerator. The laminate according to claim 2, wherein the curing accelerator contains the following (1) and / or (2).
(1) Film forming aid having a boiling point of 150 ° C. or higher
(2) Water absorbent A sheet having water shielding properties is laminated directly or via the following (A2) layer on the side of the (A1) layer that is not in contact with the polystyrene foam. 4. The laminate according to any one of 3 above.
(A2) A layer having adhesiveness. The laminate according to claim 4, wherein a finishing material layer is further laminated on the side of the sheet having water-impervious property that is not in contact with the (A1) layer. The following (B) layer is further laminated | stacked on the surface on the opposite side to the surface where the (A1) layer is laminated | stacked on the surface of a polystyrene-type foam, The one in any one of Claim 1 thru | or 5 characterized by the above-mentioned. The laminated body of description.
(B) Layer containing an asphalt component-containing water-dispersed adhesive The laminate according to any one of claims 1 to 6, wherein a primer layer is further laminated on the surface of the (B) layer that is not in contact with the polystyrene foam. A heat insulating sheet comprising the laminate according to any one of claims 1 to 7 as a constituent member. The laminate or the heat insulating sheet according to any one of claims 1 to 8 is laid such that the (B) layer or the primer layer laminated on the (B) layer is in contact with the laying surface. Laying method of polystyrene foam.

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