JP2006316411A - Heat-insulating multilayer waterproof sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat-insulating multilayer waterproof sheet for being laid as a roofing material for the roof floor, roof, veranda, etc., of a building, which is lightweight, rich in flexibility, and excellent in heat insulating properties and constructibility. <P>SOLUTION: Characteristically, an infrared-ray reflecting resin layer, in which a pigment is contained in a thermoplastic resin and in which a solar reflectance in a wavelength range of 700-2,100 nm is set at 30% or more, is formed on a waterproof-sheet base-material layer; and a foamed resin layer, which is constituted by foaming the thermoplastic resin, is formed between the waterproof-sheet base-material layer and a heat reflecting resin layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a heat-insulating multilayer waterproof sheet having a high infrared reflectiveness and having an infrared reflective resin layer laid as a roofing material such as a roof of a building, a roof, and a veranda.

  Waterproof roof sheets made of synthetic resin may be applied to roofs such as rooftops, roofs, and verandas of buildings. Among them, waterproof sheets laid at locations that are exposed to sunlight are especially used in summer and at surface temperatures. As the temperature rises, thermal deformation may occur or thermal deterioration may progress, and the life may be shortened. Therefore, as a waterproof sheet laid under such sunshine, an application-type waterproof sheet (Patent Document 1) in which a paint having a high infrared reflectance is applied to the surface of the waterproof sheet base material and an additive having a high infrared reflectance are used. A multilayer waterproof sheet (Patent Document 2) obtained by kneading into a thermoplastic resin to form a sheet and laminating the sheet on a waterproof sheet substrate has been proposed.

Among these, the paint-type waterproof sheet of Patent Document 1 has drawbacks such that the surface coating film is easily deteriorated due to ultraviolet rays or the like. Therefore, from the viewpoint of durability, it is preferable to employ a multilayer waterproof sheet in which a sheet layer containing a pigment having a high infrared reflectance is provided on the surface of Patent Document 2 as a surface layer. According to this document, it is desirable to add a ceramic balloon in addition to a pigment having high infrared reflection efficiency. This is because the ceramic balloon has a hollow shape, so that when it is added to the resin, a large number of bubbles exist, and the bubbles generate a heat insulating action and block heat transfer. As a molding method for obtaining a sheet containing this additive, methods by calendar molding and extrusion molding are suggested.
JP2004-156003 JP 2004-360332 A

  However, in the technique of Document 2, when a thermoplastic resin containing a ceramic balloon is formed into a sheet by calendar molding or extrusion molding, even if a ceramic balloon having a high compressive strength is selected, many of its hollow shapes are It may disappear and the heat shielding effect of the sheet may be lost. This is because the coating film of the ceramic balloon is ruptured not a little by the strong shearing force generated in the kneading rolling process such as calendar molding or extrusion molding. In order to solve this problem, it is conceivable to mold under the condition that the shearing force is kept low. However, in such a case, the desired thickness and surface smoothness of the sheet cannot be obtained, and there is a problem that the surface appearance is inferior. . On the other hand, it is conceivable to increase the amount of ceramic balloon added in order to improve the heat shielding effect, but in this case, the weight of the waterproof sheet is increased and the flexibility of the sheet is hindered, such as the roof For the waterproof construction method in which the method of bringing the rolled sheet of the waterproof sheet into the construction site and returning it to a flat plate and spreading it is not preferable in terms of workability.

  Accordingly, an object of the present invention is to provide a heat-insulating multilayer waterproof sheet that is excellent in heat shielding properties, lightweight, rich in flexibility, and excellent in workability.

  As a result of diligent research, the present inventor has provided a sheet containing a pigment having a high infrared reflectance on the waterproof sheet base layer as a surface layer, and heat between the waterproof sheet base layer and the infrared reflective resin layer. It has been found that the above problems can be solved by forming a foamed resin layer formed by foaming a plastic resin.

  That is, the present invention provides a heat-shielding composite material in which an infrared-reflective resin layer in which a pigment is contained in a thermoplastic resin and a solar reflectance in a wavelength region of 700 to 2100 nm is 30% or more is formed on a waterproof sheet base material layer. A gist of a heat-insulating multilayer waterproof sheet, wherein a foamed resin layer formed by foaming a thermoplastic resin is formed between the waterproof sheet base material layer and the heat-reflecting resin layer. To do.

  The foamed resin layer is preferably foamed 1.1 to 3.0 times.

  The waterproof sheet base material layer is preferably a soft polyvinyl chloride resin-based waterproof sheet layer.

  Further, the heat-insulating multilayer waterproof sheet is obtained by integrally forming the foamed resin layer and the infrared reflective resin layer by a co-extrusion molding method and then laminating the waterproof sheet base layer by a laminating method. It is preferred that

  In the heat-insulating multilayer waterproof sheet of the present invention, since the foamed resin layer formed by foaming the thermoplastic resin is formed between the waterproof sheet base material layer and the infrared reflective resin layer, the foamed resin layer is separated from the infrared reflective resin layer. It can block the transmitted heat and prevent the temperature rise of the waterproof sheet base material layer and the building frame. That is, there is an effect of contributing to energy saving in the living space in the building.

  Moreover, when a foamed resin layer is formed, it will be lightweight and will be rich in flexibility, that is, it will be excellent in workability.

  Moreover, while the foaming ratio of the foamed resin layer is specified as 1.1 to 3.0 times, it is possible to prevent the temperature rise of the building enclosure, and it is lightweight and rich in flexibility. In particular, there is an effect that the physical properties as a waterproof sheet are hardly impaired.

  Moreover, it becomes the thing excellent in economical efficiency by making a waterproof sheet base material layer into a soft polyvinyl chloride resin-type waterproof sheet layer.

  In addition, after the foamed resin layer and the infrared reflective resin layer are integrally formed by a coextrusion molding method, a long heat-insulating multilayer waterproof sheet can be efficiently obtained by laminating by a waterproof sheet base material layer and a laminating method. It will be obtained and will be particularly economical.

  Next, the heat-insulating multilayer waterproof sheet according to the present invention will be described with reference to FIG.

  FIG. 1 shows a cross section of a heat-insulating multilayer waterproof sheet 1 according to the present invention, in which a foamed resin layer 4 is formed between a waterproof sheet base material layer 2 and an infrared reflective resin layer 3 provided as a surface layer. The state in which they are laminated and integrated is shown.

  The waterproof sheet base material layer 2 is a sheet layer made of a waterproof sheet made of thermoplastic resin. Typical examples include a sheet layer made of a soft polyvinyl chloride waterproof sheet, a thermoplastic elastomer waterproof sheet such as olefin, and an ethylene vinyl acetate waterproof sheet. Especially, it is preferable that it is a soft polyvinyl chloride-type waterproof sheet layer from the point which is excellent in economical efficiency.

  The waterproof sheet base material layer 2 may be one in which a fiber reinforced layer such as a polyester fiber woven fabric or a glass fiber woven fabric is interposed or laminated on the middle, one side or both sides. As a preferred example, FIG. 1 illustrates an example in which a fiber reinforced layer 2a made of a polyester fiber fabric is laminated on one side of a thermoplastic resin waterproof sheet. Although there is no restriction | limiting in particular in the thickness of a waterproof sheet base material layer, 0.4-2 mm is preferable.

  The waterproof sheet base material layer 2 is prepared by blending and mixing a thermoplastic resin with a plasticizer, a stabilizer, a lubricant, a filler, a colorant, and other additives as necessary, and then a calendar method, an extrusion method, etc. The sheet is formed by a conventional method, and is laminated on the fiber reinforced layer 2a by a laminating method or the like as required.

  Next, the infrared reflective resin layer 3 according to the present invention is a layer formed as the outermost surface layer.

  The infrared reflective resin layer 3 needs to have a solar reflectance of 30% or more in a wavelength region of 700 to 2100 nm. The solar reflectance is specified by a method according to the optical performance test in JIS A5759 “Film for window glass”. The solar reflectance is set to 30% or more by adding a predetermined amount of a pigment having a high infrared reflection efficiency into the thermoplastic resin.

  As pigments with high infrared reflection efficiency, known pigments can be used, such as phthalocyanine, isoindolinone, perylene, azo, condensed azo, quinacridone, anthraquinone, aniline black, triphenylmethane, Dioxazine, titanium oxide, iron oxide, chromium oxide, lead chromate, spinel firing, diketopyrrolopyrrole, manganese oxide-bismuth oxide complex salt, manganese oxide-yttrium oxide complex salt, oxidation Examples thereof include iron-chromium oxide composite salt pigments.

  There is no restriction | limiting in particular as a thermoplastic resin which comprises this infrared reflective resin layer 3, For example, a polyvinyl chloride resin, a chlorinated polyethylene resin, a chlorinated vinyl chloride resin, a polymethylmethacrylate resin, polyethylene, a polypropylene, an olefin type Examples thereof include thermoplastic elastomers, ethylene-vinyl acetate copolymer resins, and ethylene-acrylic ester copolymer resins. Especially, it is preferable that it is resin which can be joined by the thermoplastic resin in the waterproof sheet base material layer 2 and the foamed resin layer 4 by heat fusion. For example, if the thermoplastic resin in the waterproof sheet base layer 2 and the foamed resin layer 4 is a soft polyvinyl chloride resin, examples thereof include polyvinyl chloride resin, polymethyl methacrylate resin, and ethylene-vinyl acetate copolymer resin. In addition, if the thermoplastic resin in the waterproof sheet base material layer 2 and the foamed resin layer 4 is an olefin-based thermoplastic elastomer, polypropylene, polyethylene, olefin-based thermoplastic elastomer, and the like can be given.

  The infrared reflection resin layer 3 is blended with the thermoplastic resin in a predetermined ratio of the pigment having high infrared reflection efficiency, and if necessary, is blended with a plasticizer, a stabilizer, a lubricant, a filler, and other additives. After mixing, it is obtained by a conventional molding method such as calendering or extrusion. The thickness of the layer is preferably 0.1 mm or more from the viewpoint of ensuring durability. More preferably, it is 0.3 mm or more.

  Next, the foamed resin layer 4 according to the present invention is a layer formed by foaming a thermoplastic resin. The expansion ratio is preferably 1.1 to 3.0 times. More preferably, it is 1.1 to 2.0 times. By specifying the expansion ratio to 1.1 times or more, the temperature rise of the waterproof sheet base material layer and the housing can be surely suppressed. On the other hand, when the expansion ratio is 1.0, that is, when foaming is not performed, it is not preferable because heat transmitted from the heat reflecting resin layer cannot be effectively blocked. If it exceeds 3.0 times, it may not be possible to achieve the required physical properties for the waterproof sheet, such as easy aggregation and peeling from the foamed resin layer. It is preferable to do.

  The thickness of the foamed resin layer 4 is preferably 0.1 mm or more. More preferably, it is 0.3.mm or more. This is because if the thickness is less than 0.1 mm, the heat transmitted from the infrared reflective resin layer 3 may not be sufficiently blocked.

  In the foamed resin layer 4, a predetermined amount of a foaming agent is added to the thermoplastic resin, and if necessary, a plasticizer, a stabilizer, a lubricant, a filler, a colorant, and other additives are blended, mixed, and then extruded. Plasticizer, stabilizer, lubricant, filler, colorant, and other additives may be added to the thermoplastic resin, if necessary, by the so-called chemical foaming method obtained by conventional molding methods such as the And mixed and put into a sheet molding machine such as an extrusion molding machine. When the resin is in a molten state, it is injected with a gas such as nitrogen or carbon dioxide at a high pressure, or easily volatilized such as butane or pentane. A so-called physical foaming method obtained by injecting a functional liquid can be employed.

  The thermoplastic resin constituting the foamed resin layer is not particularly limited in type, and a thermoplastic resin similar to the thermoplastic resin in the infrared reflection resin layer described above is selected. In particular, it is preferable to employ a resin that can be bonded by thermal fusion with the thermoplastic resin in the waterproof sheet base material layer 1 and the infrared reflective resin layer 3.

  As for the foaming agent in the above chemical foaming method, for example, azodicarbonamide (ADCA), dinitrosopentamethylenetetramine (DPT), 4,4′oxybisbenzenesulfonylhydrazide (OBSH), etc. are usually used for extrusion molding. A typical foaming agent can be used, and a plurality of different foaming agents may be combined.

  In the present invention, the waterproof sheet base material layer 2, the foamed resin layer 4, and the infrared reflective resin layer 3 are laminated in this order.

  Regarding the lamination method, each sheet layer of the waterproof sheet base material layer 2, the foamed resin layer 4 and the infrared reflecting resin layer 3 previously formed by a conventional method such as a calendar molding method or an extrusion molding method is subjected to a hot press. It is possible to integrate by molding, laminating method and the like. Alternatively, a multilayer of any one of the layers is integrated in advance by a coextrusion molding method or a calender molding method, and this multilayer sheet layer is laminated with another sheet layer by hot pressing, laminating, or the like. Examples of the method include stacking and integration.

  In particular, after the foamed resin layer 4 and the infrared reflecting resin layer 3 are integrated by a co-extrusion molding method, the waterproof sheet base material layer and the laminating method in which the two integrated layers are prepared in advance. It is preferable to adopt a method in which the layers are laminated. By carrying out like this, a long heat-insulating multilayer waterproof sheet can be obtained efficiently, and there is an effect of being particularly economical.

  The thickness of the heat-insulating multilayer waterproof sheet 1 according to the present invention thus obtained is a balance between the thicknesses of the waterproof sheet base material layer 2, the foamed resin layer 4, and the infrared reflective resin layer 3 described above. Therefore, the total thickness is preferably about 0.7 to 6 mm.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in more detail, this invention is not limited to these Examples.

[Example 1]
A sheet for back surface made of a polyvinyl chloride resin having a thickness of 0.7 mm and gray color was prepared by an extrusion method, and a polyester fiber fabric was laminated on the surface by a lamination method to obtain a waterproof sheet base material layer.

  Next, as pigments having high infrared reflectance, titanium oxide, isoindolinone, copper phthalocyanine, and diketopyrrolopyrrole pigments shown in Table 1 are blended in a predetermined amount in a polyvinyl chloride resin to form an infrared reflective resin layer. A resin composition was obtained. On the other hand, as shown in Table 1, 1 part by weight of a foaming agent was added to 100 parts by weight of the polyvinyl chloride resin to obtain a resin composition to be a foamed resin layer. By molding these resin compositions by a coextrusion molding method, a multilayer sheet layer in which a gray infrared reflecting layer having a thickness of 0.2 mm and a foamed resin layer having a thickness of 0.6 mm are integrated is obtained. It was.

Further, the multilayer sheet layer and the waterproof sheet base layer are laminated by a laminating method in such a manner that the foamed resin layer side of the multilayer sheet layer and the polyester fiber fabric laminate side of the waterproof sheet base layer overlap. A heat-insulating multilayer waterproof sheet having a total thickness of 1.5 mm was obtained. About the obtained sheet | seat, the solar reflectance and the bending elastic modulus in 0 degreeC were measured based on the method shown below. The obtained results are shown in Table 1.
<Solar reflectance>
According to the measurement method of solar reflectance of JIS A 5797 “film for window glass”, reflectance in the visible light region of 400 to 700 nm (visible light reflectance) and reflectance in the infrared region of 700 to 2100 nm (infrared reflection) Rate).
<Flexural modulus at 0 ° C>
In accordance with the measurement method of ASTM D790, the bending elastic modulus at a test temperature of 0 ° C. of the heat-insulating multilayer waterproof sheet was measured.

  Next, prepare a polystyrene foam insulation material with a thickness of 50 mm and a size of 600 mm × 600 mm, attach a temperature sensor to the center of the surface, fix a polyvinyl chloride resin-coated steel plate on the outer periphery, and then obtain the heat shielding properties obtained above. A multi-layer waterproof sheet was attached to the entire surface of the expanded polystyrene heat insulating material, and the periphery thereof was joined to a required portion of a polyvinyl chloride resin-coated steel sheet by solvent welding to prepare a test specimen for measurement.

This test specimen for measurement was placed on a concrete base in a building, exposed outdoors, and measured for each item of the maximum outside air temperature and the maximum back surface temperature of the waterproof sheet based on the following method. The obtained results are shown together in Table 1.
<Maximum outside temperature>
The maximum temperature of the outside air at the time of measurement was measured.
<Temperature on the back side of waterproof sheet>
The maximum temperature of the back surface of the waterproof sheet at the time of measurement was measured by a temperature sensor attached between the back surface of the heat-insulating multilayer waterproof sheet and the base.

[Example 2]
Each item was measured and evaluated in the same manner as in Example 1 except that the pigment described in Table 1 was changed to titanium oxide and manganese oxide-bismuth oxide composite salt. The results are also shown in Table 1.

[Example 3]
Each item was measured and evaluated in the same manner as in Example 1 except that the pigment described in Table 1 was changed to titanium oxide and manganese oxide-yttrium oxide composite salt. The results are also shown in Table 1.

[Example 4]
Each item was measured and evaluated in the same manner as in Example 1 except that the pigment described in Table 1 was changed to titanium oxide and iron oxide-chromium oxide composite salt. The results are also shown in Table 1.

[Comparative Example 1]
Each item was measured and evaluated in the same manner as in Example 1 except that the number of parts added to the foaming agent shown in Table 1 was changed to 0 parts by weight, that is, the foaming agent was not added. The results are also shown in Table 1.

[Comparative Example 2]
Each item was measured and evaluated in the same manner as in Example 1 except that the pigment described in Table 1 was changed to titanium oxide and carbon black. The results are also shown in Table 1.

  As can be seen from Table 1, the infrared ray reflectivity in the wavelength range of 700 to 2100 nm is 30% or more, and the thermal barrier compound according to Examples 1 to 4 provided with a foamed resin layer by adding a foaming agent. It is recognized that the layered waterproof sheet has an increase in the maximum temperature on the back surface of the waterproof sheet and has a heat shielding effect. Moreover, as can be seen from the flexural modulus at 0 ° C., each of the heat-insulating multilayer waterproof sheets described in Examples 1 to 4 shows good flexibility at low temperatures, which is the workability of the waterproof sheet. Indicates that it is excellent. On the other hand, the heat-insulating multilayer waterproof sheets described in Comparative Examples 1 and 2 that depart from the gist of the invention were inferior to any evaluation.

It is sectional drawing of the heat-insulating multilayer waterproof sheet 1 concerning this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light-shielding multilayer waterproof sheet 2 Waterproof sheet base material layer 2a Fiber reinforcement layer 3 Infrared reflective resin layer 4 Foamed resin layer

Claims (4)

  In the heat-shielding multilayer waterproof sheet, on the waterproof sheet base material layer, a pigment is contained in a thermoplastic resin, and an infrared reflective resin layer having a solar reflectance of 30% or more in a wavelength region of 700 to 2100 nm is formed. A heat-insulating multilayer waterproof sheet comprising a foamed resin layer formed by foaming a thermoplastic resin between a waterproof sheet substrate layer and the heat reflecting resin layer.   2. The heat-insulating multilayer waterproof sheet according to claim 1, wherein an expansion ratio of the foamed resin layer is 1.1 to 3.0 times.   The heat-insulating multilayer waterproof sheet according to claim 1 or 2, wherein the waterproof sheet base material layer is a soft polyvinyl chloride resin-based waterproof sheet layer.   Two layers of the foamed resin layer and the infrared reflective resin layer are integrated by a co-extrusion molding method, and then the two integrated sheet layers are laminated with the waterproof sheet base material layer by a laminating method. The heat-insulating multilayer waterproof sheet according to any one of claims 1 to 3.

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