JP2021127678A - Heat-insulating sash - Google Patents

Abstract

To provide a heat-insulating sash with superior heat insulating properties and recyclability.SOLUTION: A heat-insulating sash 1 according to the present invention comprises a long core material 10, and a surface layer 20 covering a surface 11 along a longitudinal direction of the core material 10. The core material is a foamed extrusion-molding body of a first resin composition including polystyrene resin. The surface layer 20 is an extrusion-molding body of a second resin composition including hard polyvinyl chloride resin.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heat insulating sash.

As a crosspiece used for the purpose of forming and reinforcing floor materials, walls, door frames, etc., it has a long core material and a surface layer covering four surfaces along the longitudinal direction of the long core material, and is long. The shaku core material is a low foam of polystyrene resin and / or impact-resistant polystyrene resin, and the surface layer is polystyrene resin and / or impact-resistant polystyrene resin, and at least one of the four surfaces along the longitudinal direction faces each other. It is known that the thickness of the surface layer of the opposite surface is 3 mm or more. In this crosspiece, the foaming ratio of the long core material is 1.5 to 5 times.

Further, as a frame body having a core material made of a foam material and a frame side portion (surface layer), a frame body having the same core material and the frame side portion is known (see, for example, Patent Document 1). ..

Japanese Unexamined Patent Publication No. 2019-100120

In recent years, even if the frame is composed of a composite of a core material and a surface layer like the frame described in Patent Document 1, it is desired to separate and recover the resin constituting each portion. However, since the resin sash described in Patent Document 1 is made of the same resin as the core material and the frame side portion, the core material and the surface layer have high adhesion and cannot be easily separated. Therefore, there is a problem that recycling is difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heat insulating sash having excellent heat insulating properties and recyclability.

The heat insulating sash of the present invention includes a long core material and a surface layer covering a surface along the longitudinal direction of the core material, and the core material is foam extrusion molding of a first resin composition containing a polystyrene resin. It is a body, and the surface layer is an extruded body of a second resin composition containing a hard polyvinyl chloride resin.

It is sectional drawing which shows the heat insulation sash of one Embodiment of this invention. It is a schematic diagram which shows an example of the extrusion molding machine for a heat insulating sash.

Hereinafter, embodiments of the heat insulating sash of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a heat insulating sash according to an embodiment of the present invention.

[Composite sash]
As shown in FIG. 1, the heat insulating sash 1 includes a core material 10 and a surface layer 20 that covers the surface 11 of the core material 10. The core material 10 is a long member. The surface layer 20 is a member that covers the surface 11 along the longitudinal direction of the long core material 10. The core material 10 is a foam extruded body of the first resin composition, as will be described later. The surface layer 20 is an extruded body of the second resin composition, as will be described later. The heat insulating sash 1 is a coextruded body obtained by coextrusion molding of the first resin composition and the second resin composition, as will be described later.

In the present embodiment, as shown in FIG. 1, the core material 10 has a rectangular shape in a cross section perpendicular to the longitudinal direction. Therefore, the core material 10 has four surfaces 11a, 11b, 11c, 11d along the longitudinal direction. The surface layer 20 covers all of these four surfaces 11a, 11b, 11c, and 11d. That is, in the heat insulating sash 1, the core material 10 is completely covered by the surface layer 20 in the longitudinal direction, and the core material 10 is not exposed.

The core material 10 is a foam extruded body of the first resin composition containing a polystyrene resin. Polystyrene resin has no polarity. Examples of polystyrene resin include general-purpose polystyrene and impact-resistant polystyrene. Impact-resistant polystyrene is a general-purpose polystyrene to which a rubber component such as a butadiene copolymer is added to improve impact resistance.

The first resin composition may contain additives other than polystyrene resin. Examples of additives other than polystyrene resin include foaming agents, colorants, flame retardants, stabilizers, lubricants, processing aids, antioxidants, ultraviolet absorbers and the like. These additives may be used alone or in combination of two or more. Examples of the foaming agent include an inorganic foaming agent and an organic foaming agent. Examples of the inorganic foaming agent include sodium hydrogen carbonate, ammonium carbonate, sodium boron hydroxide, azide compounds and the like. Examples of the organic foaming agent include azodicarbonamide, dinitrosopentamethylenetetramine, oxybisbenzenesulfonylhydrazide, toluenesulfonylhydrazide, trihydrazinetriazine, hydrazodicarboxylicamide, bariumazodicarboxylate and the like. When the first resin composition contains the above-mentioned foaming agent, the foam-extruded molded product (core material 10) of the first resin composition also contains the above-mentioned additive.

The foaming ratio of the core material 10 is preferably 2 times or more, more preferably 4 times or more, and further preferably 7 times or more. When the foaming ratio of the core material 10 is 4 times or more, a weak physical adhesion (recyclable) occurs between the core material 10 and the surface layer 20, and the core material 10 cannot be removed from the surface layer 20 when carrying or cutting. Handleability is improved.

The expansion ratio of the core material 10 can be calculated, for example, by dividing the specific gravity of the unexpanded polystyrene resin by the specific gravity of the expanded polystyrene resin. The specific gravity is obtained by cutting the core material 10 into a constant size, measuring the weight of the core material 10 (measured with an electronic balance, etc.), and measuring the volume of the core material 10 (thickness, width, dimensions in the length direction with a caliper). Calculation) can be calculated by dividing.

The thermal conductivity of the core material 10 is preferably 0.07 W / m · K or less, and more preferably 0.035 W / m · K or less. When the thermal conductivity of the core material 10 is 0.035 W / m · K or less, the heat insulating sash 1 has excellent heat insulating properties.

The thermal conductivity of the core material 10 can be measured, for example, by using the heat flow metering method (HFM method) specified in JIS A1412-2. Examples of the device include a thermal conductivity measuring device FOX200, 300 series manufactured by Hideko Seiki Co., Ltd. Only the foamed resin part of the core material is cut out and measured. If the sample size of the foamed resin is small and the specified size cannot be obtained, a plurality of foamed resins may be measured side by side.

The surface layer 20 is an extruded body of a second resin composition containing a hard polyvinyl chloride resin. Hard polyvinyl chloride resin has polarity. Examples of the rigid polyvinyl chloride resin include a polyvinyl chloride homopolymer, a polyvinyl chloride copolymer, and a polyvinyl chloride graft copolymer. A copolymer of polyvinyl chloride is a copolymer of a vinyl chloride monomer and another monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer. The polyvinyl chloride graft copolymer is a graft copolymer obtained by graft-copolymerizing a vinyl chloride monomer with a polymer other than a polyvinyl chloride resin. As the hard polyvinyl chloride resin, one type may be used alone, or two or more types may be used in combination.

Other monomers having an unsaturated bond copolymerizable with a vinyl chloride monomer include, for example, α-olefins, vinyl esters, vinyl ethers, (meth) acrylic acid esters, aromatic vinyls, and N-substituted maleimides. Kind and the like. Examples of α-olefins include ethylene, propylene, butylene and the like. Examples of vinyl esters include vinyl acetate, vinyl propionate and the like. Examples of vinyl ethers include butyl vinyl ether and cetyl vinyl ether. Examples of (meth) acrylic acid esters include methyl (meth) acrylate, ethyl (meth) acrylate, butyl acrylate and the like. Examples of aromatic vinyls include styrene and α-methylstyrene. Examples of N-substituted maleimides include N-phenylmaleimide and N-cyclohexylmaleimide. As the other monomer, one type may be used alone, or two or more types may be used in combination.

As used herein, (meth) acrylate means either acrylate or methacrylate. (Meta) acrylic acid means either acrylic acid or methacrylic acid.

Examples of the polymer for graft-copolymerizing the vinyl chloride monomer include ethylene-vinyl acetate copolymer, ethylene-vinyl acetate-carbon monoxide copolymer, ethylene-ethyl acrylate copolymer, and ethylene-butyl acrylate-monooxide. Examples thereof include carbon copolymers, ethylene-methylmethacrylate copolymers, ethylene-propylene copolymers, acrylonitrile-butadiene copolymers, polyurethanes, chlorinated polyethylenes and chlorinated polypropylenes. These polymers may be used alone or in combination of two or more.

The second resin composition may contain additives other than the rigid polyvinyl chloride resin. Examples of additives other than the hard polyvinyl chloride resin include colorants, flame retardants, stabilizers, lubricants, processing aids, antioxidants, ultraviolet absorbers and the like. These additives may be used alone or in combination of two or more.

In the heat insulating sash 1 of the present embodiment, as shown in FIG. 1, the case where the surface layer 20 has a one-layer structure made of a hard polyvinyl chloride resin is illustrated, but the heat insulating sash of the present invention is not limited to this. .. In the heat insulating sash of the present invention, the surface layer is provided on the core material side and is laminated on the first layer made of a rigid polyvinyl chloride resin and the first layer, and the acrylic resin or the polyvinyl chloride is laminated. It may have a second layer made of a vinyl resin. When the second layer is made of a polyvinyl chloride resin, a resin different from the polyvinyl chloride resin constituting the first layer is used.

As shown in FIG. 1, the surface layer 20 has a cross-sectional shape perpendicular to the longitudinal direction according to the application (the part of the sash to be applied). The shape shown in FIG. 1 is an example, and the shape of the surface layer 20 in the present embodiment is not limited to this.

The thermal conductivity of the surface layer 20 is preferably 0.50 W / m · K or less, and more preferably 0.17 W / m · K or less. When the thermal conductivity of the surface layer 20 is 0.17 W / m · K or less, the heat insulating sash 1 has excellent heat insulating properties.

According to the heat insulating sash 1 of the present embodiment, the core material 10 includes a long core material 10 and a surface layer 20 that covers the surface of the core material 10 along the longitudinal direction, and the core material 10 is a first resin containing a polystyrene resin. Since it is a foam extruded body of the composition and the surface layer 20 is an extruded body of the second resin composition containing a hard polyvinyl chloride resin, it is possible to provide a heat insulating sash having excellent heat insulating properties and recyclability. can. In other words, the heat insulating sash 1 is a first foam extruded body containing a polystyrene resin in which the core material 10 has no polarity, and a second foam extruded body in which the surface layer 20 contains a rigid polyvinyl chloride resin having polarity. Since it is an extruded body of the resin composition, the core material 10 and the surface layer 20 can be easily separated at the interface between the two.

[Manufacturing method of heat insulating sash]
A method for manufacturing a heat insulating sash according to an embodiment of the present invention will be described. The method for manufacturing a heat insulating sash of the present embodiment includes an extrusion molding step of molding an extruded product for a heat insulating sash.

In the extrusion molding step, the first resin composition and the second resin composition are extruded (coextruded) to form a tubular surface layer with the second resin composition, and the first resin composition. This is a process of forming a core material located in the surface layer with an object. From the viewpoint of further increasing productivity, the surface layer and the core material are preferably molded by coextrusion.

A core material is obtained by foam extrusion molding of the first resin composition.
The first resin composition is obtained by mixing a polystyrene resin, a foaming agent, and if necessary, an additive other than the foaming agent using a heat mixer or the like. The first resin composition may be in the form of powder or pellets. The first resin composition is preferably in the form of pellets because it is excellent in handleability.

As the foaming agent, the above-mentioned inorganic foaming agent or organic foaming agent is used. An inorganic foaming agent is preferable because the foaming ratio of the first resin composition can be increased to 7 times or more.
The amount of the foaming agent added is preferably 0.1% by mass or more and 30% by mass or less, and more preferably 2% by mass or more and 20% by mass or less in 100% by mass of the first resin composition. In particular, when the foaming agent is an inorganic foaming agent, the amount of the inorganic foaming agent added is preferably 2% by mass or more and 20% by mass or less, preferably 6% by mass or more, based on 100% by mass of the first resin composition. It is more preferably 16% by mass or less. When the amount of the inorganic foaming agent added is 6% by mass or more, a weak physical adhesion can be formed between the core material and the surface layer, and a sufficient foaming ratio without any problem in terms of handling can be obtained. When the amount of the inorganic foaming agent added is 16% by mass or less, a high foaming ratio can be ensured without lowering the foaming ratio.

A surface layer is obtained by extrusion molding the second resin composition.
The second resin composition is obtained by mixing a hard polyvinyl chloride resin and, if necessary, an additive using a heat mixer or the like. The second resin composition may be in the form of powder or pellets. The second resin composition is preferably in the form of pellets because it is excellent in handleability.

A method for producing an extruded product for a heat insulating sash will be described with reference to FIG. FIG. 2 is a schematic view showing an example of an extrusion molding machine for a heat insulating sash. As shown in FIG. 2, the extruder 100 includes a core material extruder 110, a hopper 112, a surface extruder 120, a hopper 122, a die 130, and a cooler 140.

The first resin composition is put into the hopper 112 and heated to a predetermined temperature by the core material extruder 110 to obtain the first melt. The first melt is extruded by the core material extruder 110.

In parallel with obtaining the first melt, the second resin composition is put into the hopper 122 and heated to a predetermined temperature by the surface extruder 120 to obtain the second melt. The second melt is extruded by the surface extruder 120.

The extruded first melt and the second melt pass through the die 130, are co-extruded, and are integrated, and are passed through the cooler 140 by a taker (not shown) to be an extruded product for a heat insulating sash. 50 is obtained (extrusion molding step). That is, in the die 130, the surface layer is formed by the second melt, and the core material is formed by foaming the first melt extruded into the surface layer. The extruded product 50 is cut to an arbitrary length to obtain a heat insulating sash 1 having a long core material 10 and a surface layer 20 covering a surface 11 along the longitudinal direction of the core material 10. The cooling temperature in the cooler 140 is preferably, for example, 5 ° C. or higher and 20 ° C. or lower.

[How to recycle heat insulating sashes]
A method for recycling the heat insulating sash according to the embodiment of the present invention will be described. As a method of recycling the heat insulating sash 1 of the present embodiment, that is, a method of separating the core material 10 and the surface layer 20, for example, a method of peeling (peeling) the surface layer 20 from the core material 10, a method of peeling off the core material 10 and the surface layer 20. Examples include a method of utilizing the difference in specific gravity.

As a method of peeling the surface layer 20 from the core material 10, for example, a method of applying an impact to the surface layer 20 to make a crack in the surface layer 20 and then peeling the surface layer 20 from the core material 10 from the crack as a starting point can be mentioned. Be done.

Examples of the method of utilizing the difference in specific gravity between the core material 10 and the surface layer 20 include the following methods. First, foreign matter such as metal is removed from the heat insulating sash 1. Next, the heat insulating sash 1 from which foreign matter has been removed is crushed and washed. Next, the powder of the crushed heat insulating sash 1 is put into a water tank type specific gravity sorter, and the polystyrene resin and the hard polyvinyl chloride resin are sorted by utilizing the difference in specific densities between the polystyrene resin and the hard polyvinyl chloride resin. At this time, the powder of the hard polyvinyl chloride resin having a large specific gravity sinks to the lower side of the water tank, and the powder of the polystyrene resin having a small specific density floats to the upper side of the water tank. Therefore, the polystyrene resin and the hard polyvinyl chloride-based resin separated in the water tank are collected separately. Next, the recovered polystyrene resin and hard polyvinyl chloride-based resin are dehydrated, and each resin is stored in a storage tank.

Although the preferred embodiment of the present invention has been described in detail above, the present invention is not limited to the above-described embodiment. The present invention may be modified within the scope of the gist of the invention described within the claims.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Example 1]
In the same manner as the above-mentioned method for producing a heat insulating sash, a first resin composition containing a polystyrene resin as a main component and a second resin composition containing a hard polyvinyl chloride resin as a main component are coextruded. A heat insulating material having a core material which is an extruded body of the first resin composition containing a polystyrene resin and a surface layer which is an extruded body of the second resin composition containing a hard polyvinyl chloride resin. I got a sash. The foaming ratio of the core material was 6.9 times. The molding temperature of the surface layer during coextrusion molding was 185 ° C., and the molding temperature of the core material was 200 ° C.
ES405 (trade name, including sodium hydrogen carbonate and polystyrene resin) manufactured by Eiwa Kasei Co., Ltd. was added to the first resin composition as a foaming agent.

[Comparative Example 1]
Similar to the above-mentioned method for producing a heat insulating sash, a third resin composition containing a hard polyvinyl chloride resin as a main component and a second resin composition containing a hard polyvinyl chloride resin as a main component are prepared. Co-extrusion molding is performed to extrude a core material which is a foam extrusion molded product of a third resin composition containing a hard polyvinyl chloride resin and a second resin composition containing a hard polyvinyl chloride resin. A heat insulating sash having a surface layer which is a body was obtained. The foaming ratio of the core material was 6.2 times. The molding temperature of the surface layer during coextrusion molding was 185 ° C., and the molding temperature of the core material was 195 ° C.
As a foaming agent, Vinihole AC # 3 (trade name) and Cerbon SC-P (trade name) manufactured by Eiwa Kasei Co., Ltd. were mixed and added to the third resin composition at a mass ratio of 1: 1.

[evaluation]
For the heat insulating sash of the example and the heat insulating sash of the comparative example, the surface layer was manually peeled off from the core material, and the separated state between the core material and the surface layer was confirmed.
As a result, in the heat insulating sash of the example, the core material and the surface layer could be separated at the interface between the two. on the other hand. In the heat insulating sash of the comparative example, the core material and the surface layer could not be separated at the interface between the two, and the core material broke.

[Example 2]
ES405 (trade name) manufactured by Eiwa Kasei Co., Ltd. was added to the first resin composition as an inorganic foaming agent. The amount of the inorganic foaming agent added was 5% by mass in 100% by mass of the first resin composition. The other things were the same as in Example 1, and the heat insulating sash of Example 2 was obtained.
The foaming ratio of the core material of the obtained heat insulating sash was 3.3 times.

[Comparative Example 2]
A heat insulating sash of Comparative Example 2 was obtained in the same manner as in Example 1 except that the inorganic foaming agent was not added to the first resin composition.
The foaming ratio of the core material of the obtained heat insulating sash was 1.

[Example 3]
ES106 (trade name, including azodicarbonamide and polystyrene resin) manufactured by Eiwa Kasei Co., Ltd. was added to the first resin composition as an organic foaming agent. The amount of the organic foaming agent added was 10% by mass based on 100% by mass of the first resin composition. The heat insulating sash of Example 8 was obtained in the same manner as in Example 1.
The foaming ratio of the core material of the obtained heat insulating sash was 2.6 times.

[Comparative Example 3]
A heat insulating sash of Comparative Example 3 was obtained in the same manner as in Example 8 except that the amount of the organic foaming agent added was 5% by mass in 100% by mass of the first resin composition.
The foaming ratio of the core material of the obtained heat insulating sash was 1.4 times.

1 Insulation sash, 10 core material, 20 surface layer, 50 extrusion product, 100 extrusion molding machine, 110 core material extruder, 112, 122 hopper, 120 surface layer extruder, 130 die, 140 cooler

Claims (4)

A long core material and a surface layer covering a surface along the longitudinal direction of the core material are provided.
The core material is a foam extruded body of a first resin composition containing a polystyrene resin.
A heat insulating sash whose surface layer is an extruded body of a second resin composition containing a hard polyvinyl chloride resin. The heat insulating sash according to claim 1, wherein the core material has a foaming ratio of 2 times or more. The heat insulating sash according to claim 1 or 2, which is a coextruded molded product of the first resin composition and the second resin composition. The heat insulating sash according to any one of claims 1 to 3, wherein the first resin composition contains an inorganic foaming agent.

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