JP2002292631A - Method for separation by decreasing volume of thermoplastic resin foamed material laminated body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for separating and classifying, for a short time, a bulky thermoplastic resin foamed material laminated body likely comprising foamed polystyrene and a plasterboard simply into the original foamed polystyrene and the plasterboard by easily decreasing a volume. SOLUTION: By adding heat at a softening temperature of a thermoplastic resin foamed material laminated body and a heat expansion temperature of a bond layer to a thermoplastic resin foamed material laminated body by being bonded to a base material via the bond layer having a heat expandable function formed by a bonding agent capable of being bonded to a thermoplastic resin foamed body. (1) The thermoplastic resin foamed body is reduced in volume by destroying foaming of the thermoplastic resin foamed material and (2) the thermoplastic resin foamed material of which the volume is reduced, is separated from the base material using the expanded bonding layer as an interface by expanding the bond layer to provide a method for separation by volume reduction of the thermoplastic resin foamed material laminated body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating industrial waste and recycling resources of a thermoplastic resin foam laminate comprising a base material and a thermoplastic resin foam. More specifically, by applying heat to the waste material of the thermoplastic resin foam laminate, the foaming of the thermoplastic resin foam is destroyed to reduce the volume, and in particular, a process of reducing the shrinkage and reducing the thickness and area, and Separation and separation of the thermoplastic resin foam material from the base material in the form of a cracked resin plate with a reduced thickness by separating the material, especially the shrinkage-reduced material and the base material at the interface of the expanded adhesive layer The present invention relates to a method of recycling resources, and particularly to a method of effectively recycling the resources in a short time.

[0002]

2. Description of the Related Art Thermoplastic foamed material laminates include foamed materials such as polystyrene, polyethylene, polypropylene, polyurethane, natural rubber, and styrene-butadiene rubber, and inorganic boards, wood boards, metal boards, thermosetting resin boards, and the like. And a base material. These thermoplastic resin foam laminates are widely used in industry as building materials such as partitions and partition walls, or as partition materials for automobiles, aircraft, ships and the like. A typical example is a laminate of a thermoplastic resin foam such as a styrofoam plate known as Styrofoam (trade name) and a substrate made of an inorganic board such as a gypsum board.

[0003] The thermoplastic resin foam material laminate is an extremely valuable material that can achieve heat insulation and light weight by foaming a resin material. However, when it becomes waste material, it becomes an extremely troublesome material. In other words, these laminates cannot be easily separated, and having a foamed air layer that is useful in the use environment is a major factor that becomes a bulky material when discarded. Most of the base material of the thermoplastic resin foam laminate is a non-combustible inorganic board from the viewpoint of use, and cannot be incinerated as it is, and is buried in the soil without being separated and separated. By the way, since the thermoplastic resin foam material is bulky in the air layer, the yield of the industrial waste treatment plant is lowered. This has further exacerbated the shortage of land at industrial waste disposal sites.

[0004] If there is a useful technology that can easily separate and separate these thermoplastic resin foam laminates and reuse it as a resource, it will be a significant social contribution and an industrially useful technology. However, no such technology has been found, and serious industrial waste problems are continually eroding the earth.

[0005]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is not only to easily separate a thermoplastic resin foam material laminate made of styrene foam and gypsum board into the original styrene foam and gypsum board, but also Another object of the present invention is to provide a technology that enables a resource to be reused by easily reducing the volume of a bulky thermoplastic resin foam material, in particular, reducing the shrinkage, which is a reduction in thickness and area. Another object of the present invention is to provide a method for reducing atrophy volume and performing separation and fractionation in a short time.

[0006]

According to the first aspect of the present invention, there is provided a heat-expandable resin formed of an adhesive capable of adhering to a substrate and a thermoplastic resin foam. By applying heat above the softening temperature of the thermoplastic resin foam material laminate and the thermal expansion temperature of the adhesive layer to the thermoplastic resin foam material laminate adhered via the functional adhesive layer, 1) The volume of the thermoplastic resin foam is reduced by destroying the foaming of the thermoplastic resin foam material, and (2)
This is a method for separating and reducing the volume of a thermoplastic resin foam laminate, which comprises separating the thermoplastic resin foam material reduced in volume by expanding the adhesive layer from the substrate with the expanded adhesive layer as an interface.

According to the second aspect of the present invention, the volume reduction is achieved by reducing the thickness of the thermoplastic resin foam. It is a separation method.

According to a third aspect of the present invention, the volume reduction is a shrinkage reduction of the thickness and plane area of the thermoplastic resin foam. This is a method for separating the volume of the laminate.

As described above, a foamed thermoplastic resin material such as styrene foam is a resin material having low surface tension which is difficult to adhere to, and an anchoring effect can be expected by forming irregularities by foaming. It is much easier than that. Therefore, an adhesive that can be adhered to this is found, and the thermal expansion function is added to the composition of the thermally expandable fine hollow particles according to the means of claim 5, or the chemical foaming agent, and the entrainment of micro bubbles by foaming. Give it. A thermoplastic resin foam laminate is manufactured with such an adhesive, and is useful as various industrial materials, and the material eventually becomes used waste material. At this time, if the thermoplastic resin foam material laminate is heated at a temperature not lower than the thermal expansion temperature of the adhesive layer, and the softening temperature of the thermoplastic resin foam, the thermoplastic resin foam softens and accompanies destruction of the foamed state. Thus, the volume reduction due to the reduction in thickness of the means of the second aspect, or the shrinkage reduction due to the reduction in thickness and plane area of the means of the third aspect occurs. In this state, a smooth resin-like sheet like a thinly roasted rice cracker (this is called a “rice cracker-like sheet”) is obtained. In other words, the image of the rice cracker-shaped sheet is, for example, a thinly baked rice cracker such as a carbonated rice cracker, a crepe confectionery that has been dried, or a Western-style rice cracker such as a goful (trade name). It is a sheet. At the interface between the rice cracker-like sheet and the formed film made of the adhesive,
Since the rice cracker-shaped sheet returns to a state close to the original thermoplastic resin before foaming, the anchoring effect is lost and it becomes a state of poor adhesion,
Therefore, adhesion becomes unstable. On the other hand, the adhesive layer expands due to the expansion of the heat-expandable fine-grained hollow particles in the adhesive layer due to the heating, so that an adhesive failure (separation) occurs at the interface of the expanded adhesive layer. In this way, the reduced volume, especially the shrunk and reduced volume of the rice cracker sheet is completely detached from the base material, so that it becomes a reusable plastic by stacking, and the base material forms a layer of the adhesive adhered to the surface. By polishing, it can be reused as a board or recycled by means of crushing.

[0010] In the invention of claim 4, the thermoplastic resin foam material is made of polystyrene, polyethylene, polypropylene,
The thermoplastic resin according to any one of claims 1 to 3, comprising at least one selected from polyurethane, natural rubber, and styrene-butadiene rubber, and having an expansion ratio of 5 or more. It is a volume reducing separation method for a foamed material laminate.

The present invention is most effective when the above-mentioned polymer or elastomer material is used as the thermoplastic resin foam material for producing the thermoplastic resin foam laminate, and a foam material having an expansion ratio of 5 times or more is selected. Can be implemented.

According to a fifth aspect of the present invention, the thermal expansion function of the adhesive layer is provided from a thermally expandable fine hollow particle compounded in the adhesive layer of the thermoplastic resin foam laminate. A volume reducing separation method for a thermoplastic resin foam material laminate according to any one of the above items (4) to (4).

The blending of the heat-expandable fine-grained hollow body efficiently performs the thermal expansion of the adhesive layer, and reduces the volume of the adhesive layer, particularly, the interface between the shrunk and reduced volume of the rice cracker sheet and the film formed of the adhesive, that is, the adhesive. This is the technical means for causing the adhesive failure (separation) at the interface of the layers most easily.

According to the sixth aspect of the present invention, the adhesive layer having a thermal expansion function has (A) a formed film after drying having a tensile strength of 1 to 1.
An aqueous adhesive containing a polymer having properties of 28 MPa and an elongation of 200 to 2000%, and (B) an aqueous adhesive composition containing a thermally expandable fine hollow body mixed with an adhesive. Item 6. The method for reducing the volume of a thermoplastic resin foam material laminate according to any one of Items 1 to 5.

That is, the physical properties in this range provide excellent expansion followability to the expansion of the heat-expandable fine hollow particles, and the fact that the adhesive is an aqueous adhesive composition means that the thermoplastic resin foam in the expanded state While giving good adhesiveness to the material, it does not adhere much to the thermoplastic resin foam material that became a hard-to-adhere rice cracked sheet by reducing the volume, especially shrinking and reducing the volume, so at the interface of the adhesive layer, This is an option that makes it easy for adhesive breakage (separation) to occur.

In the invention of claim 7, the aqueous dispersion containing the polymer in the component (A) is selected from a polyvinyl acetate polymer, a urethane polymer, an acrylic polymer, a silicone polymer, a chloroprene elastomer, and a styrene butadiene elastomer. 7. A method for reducing the volume of a thermoplastic resin foam laminate according to claim 6, wherein the aqueous dispersion contains one or more polymers.

That is, when these polymers are used as a backbone, they provide excellent expansion followability to the expansion of the heat-expandable fine-grained hollow body, and provide excellent anchoring effect to the foamed thermoplastic resin foam material by the anchoring effect. To maintain excellent adhesive quality in the use environment, and at the interface of the adhesive layer,
This is a possible choice for adhesive failure (separation).

According to the invention of claim 8, the aqueous dispersion containing the polymer of the component (A) comprises an ethylene-vinyl acetate copolymer emulsion. This is a method for reducing the volume of a resin foam material laminate.

That is, when these polymers are used as a backbone, the most excellent expansion following property is given to the expansion of the thermally expandable fine hollow particles, and the adhesive property is given to the foamed thermoplastic resin foam material. It provides excellent bonding quality in the use environment, particularly, bonding strength, water resistance, and heat resistance, and is a choice that easily causes bonding failure (separation) at the interface of the bonding layer.

The invention according to claim 9 is characterized in that the aqueous dispersion containing the polymer of component (A) comprises an ethylene-vinyl acetate copolymer emulsion and an anionic polyurethane emulsion. Means for reducing the volume of a thermoplastic resin foam laminate. In other words, when these polymers are used as a backbone, they give excellent expansion followability to the expansion of the thermally expandable fine hollow particles, and give the most excellent adhesiveness to the foamed thermoplastic resin foam material. Provides excellent adhesive quality in the use environment, especially adhesive strength, high water resistance and heat resistance, and is the choice in which adhesive failure (separation) occurs most easily at the interface of the adhesive layer.

According to the tenth aspect of the present invention, the water-based adhesive composition contains the heat-expandable fine hollow particles of the component (B) based on 100 parts by mass of the polymer solid content of the aqueous dispersion containing the polymer of the component (A). The method for reducing the volume of a thermoplastic resin foam laminate according to any one of claims 6 to 9, wherein 2 to 100 parts by mass of the body are blended.

This compounding ratio has a small influence on the adhesiveness decrease due to the compounding of the heat-expandable fine hollow particles, and at the interface of the adhesive layer,
Adhesion failure (separation) is the easiest option to occur.

According to the eleventh aspect of the present invention, the thermally expandable fine hollow particles of the component (B) have an expansion ratio of 20 to 100 times,
The method for reducing the volume of a thermoplastic resin foam material laminate according to any one of claims 6 to 10, wherein the foaming start temperature is 90 to 150 ° C.

If the expansion ratio of the heat-expandable fine hollow particles is selected in this range, the adhesive breakage (separation) occurs most easily at the interface of the adhesive layer. When the foamed material laminate is used for a wide range of uses such as a house and a vehicle, the temperature range becomes a temperature range where the foamed material laminate can be used safely in a use environment.

According to a twelfth aspect of the present invention, in the method for reducing the volume of a thermoplastic resin foam material laminate, the thermoplastic resin foam material laminate is irradiated with far infrared rays in a heating furnace. Item 12 is the method for reducing the volume of the thermoplastic resin foam material laminate according to any one of Items 1 to 11.

By irradiating far-infrared rays in this heating furnace, compared with the method of heating only by a heating furnace, the volume is reduced, especially the shrinkage and volume is reduced (made of a rice cracker-like sheet), and the interface at the interface of the adhesive layer is reduced. Since the adhesive breakage (separation) can be performed in the shortest time, the thermal degradation of the rice cracked sheet is small and the value of recyclable material is enhanced.

According to the thirteenth aspect, the far-infrared radiation is
13. The method for reducing the volume of a thermoplastic resin foam material laminate according to the means of claim 12, wherein the irradiation is performed with far infrared rays having a wavelength of 5 to 30 .mu.m.

The selection of the wavelength is the most efficient means for reducing the volume, in particular, reducing the shrinkage (making a rice cracker-like sheet) and breaking the adhesive (separation) at the interface of the adhesive layer.

According to a fourteenth aspect of the present invention, in the method for reducing the volume of the thermoplastic resin foam material laminate, the ultraviolet ray is irradiated to the thermoplastic resin foam material laminate in a heating furnace. A volume reducing separation method for a thermoplastic resin foam material laminate according to any one of the above-mentioned means.

This means can reduce the volume of the thermoplastic resin foam laminate in a short time after irradiation with far infrared rays.

[0031]

DETAILED DESCRIPTION OF THE INVENTION The present invention begins with the selection of an adhesive that can be adhered to a thermoplastic foam material such as polystyrene, polyethylene, polypropylene, polyurethane, natural rubber, styrene-butadiene rubber, or the like.
The term "adhesive" as used herein means a state where the development of various properties such as adhesive strength, water resistance and heat resistance required for the application is practical and satisfactory. Once the adhesive that can be adhered is determined, the method of providing a thermal expansion function can be selected by blending an expanding agent such as a thermally expandable fine hollow particle, blending a chemical foaming agent, and bubbling micro-bubbles. I do. Then, the thus obtained thermal expansion adhesive of the present invention further maintains the bonding function with respect to the thermoplastic resin foam material to be bonded, or an inorganic board, a wood board, or a metal as a base material. Board,
The adhesive is determined in consideration of the configuration with the thermosetting resin plate, the bonding work line, whether it can be applied to the site, the use thereof, and the degree of bonding quality required in the usage environment of the bonded product. Then, using the thermal expansion adhesive of the present invention, the bonding quality is checked in consideration of the bonding operation and the use environment, and a volume reduction separation method is finally performed when the material becomes waste. The conditions are the temperature, time, and volume reduction, especially shrinkage-reduced heat, at which the foaming of the thermoplastic resin foam material is destroyed by heating to reduce the volume, especially shrinkage and volume reduction (making rice cracked sheets). The temperature and time for separation at the interface between the foamed plastic material and the expanded adhesive layer are determined. If the substrate such as a gypsum board is smooth, this rice crack-like sheet is expressed as such because a thinly-baked rice crack becomes a burnt resin sheet on its plane. For example, styrene foam having a thickness of 20 mm is reduced in volume to a thickness of about 0.5 mm, so that bulkiness is extremely reduced. This heating is usually performed using a heating furnace, but if far infrared irradiation or ultraviolet irradiation is used in combination, the effects of the present invention can be obtained in a remarkably short time.

In the present invention, the adhesive, the compounding agent for providing a heat-expanding function, or the method thereof is not limited. According to the technical means in which such an expanding agent is blended, the best mode will be described below in this section.

In general, in the present invention, an aqueous dispersion containing, as the component (A), a polymer having properties of a dried film having a tensile strength of 1 to 28 MPa and an elongation of 200 to 2000% is desirable. This determination can be used as it is if the dry film of the aqueous dispersion containing the polymer is within this range. If it is not within this range, a softener such as a plasticizer, a crosslinking agent, or a reinforcing agent such as an inorganic filler may be adjusted to have this property. That is, the tensile strength of the formed film after drying is 1MP.
If less than a, the cohesive force is insufficient, so that it tends to be insufficient to maintain the adhesive performance at the time of use, and if it exceeds 28 MPa, the effect of the present invention is poor by suppressing the expansion of the thermally expandable fine hollow particles. Become. If the elongation percentage of the dried film is less than 200%, the expansion of the thermally expandable fine hollow particles is suppressed, and the effect of the present invention cannot be obtained.
%, The cohesive strength is insufficient, so that it is difficult to maintain the adhesive performance during use. The most effective physical property region which gives the effect of maximizing the expansion of the heat-expandable fine-grained hollow body is as follows: the tensile strength of the formed film after drying is 3 to 15 MPa, and the elongation percentage is 500 to 1
The range is 500%.

A method for obtaining the formed film can be obtained by uniformly applying an aqueous dispersion containing a polymer on release paper or the like, followed by drying naturally. Confirmation of the characteristics of the formed film can be determined by a method based on JIS K6251. The film strength in this method is the maximum breaking strength at a normal temperature of 23 ° C., and the elongation is the maximum elongation at that time. In addition, when the thermally expandable fine hollow particles of the component (B) are blended with the component (A), the maximum strength,
Since the elongation is affected, it is necessary to determine the properties of the component (A) without blending the component (B).

The aqueous dispersion (polymer emulsion) containing the polymer of the component (A) is one selected from the group consisting of a polyvinyl acetate polymer, a urethane polymer, an acrylic polymer, a silicone polymer, a chloroprene elastomer and a styrene butadiene elastomer. The above polymers may be selected. What is a polyvinyl acetate polymer?
It is a polyvinyl acetate homopolymer, an ethylene-vinyl acetate copolymer, or a vinyl acetate-acrylate copolymer. The acrylic polymer is a (meth) acrylate-based copolymer or a (meth) acrylate-styrene copolymer. The sulfonic acid-modified anionic polyurethane polymer is a urethane polymer having a sulfonate group in the urethane polymer molecule and usually being a sulfonate salt and being emulsion-stable. The water-dispersible silicone polymer is a silicone polymer having a skeleton having an organosilane structure, and a modified silicone polymer having a main chain structure of polyoxypropylene.

In the present invention, if an ethylene-vinyl acetate copolymer emulsion or an adhesive composed of an ethylene-vinyl acetate copolymer emulsion and an anionic polyurethane emulsion is selected, the production at a decorative board factory, a panel factory, and the like can be performed. It has excellent line suitability, gives the most excellent adhesiveness to thermoplastic resin foam material, expresses quality performance such as water resistance and heat resistance, and has excellent expansion followability of the heat-expandable fine hollow body. In this case, adhesive failure (separation) easily occurs.

This ethylene-vinyl acetate copolymer emulsion preferably contains polyvinyl alcohol in view of suitability for production lines and easy mixing of the heat-expandable fine hollow particles. In particular, when the ethylene-vinyl acetate copolymer emulsion and the sulfonic acid-modified anionic polyurethane emulsion are blended, a decrease in adhesion and water resistance due to the blending of the heat-expandable fine hollow particles can be suppressed.

Further, in the case where the ethylene-vinyl acetate copolymer emulsion has a characteristic that the toluene-insoluble content is 70% by mass or more, the effect of suppressing the decrease in adhesion and water resistance by blending the heat-expandable fine hollow particles. Is remarkable.
Ethylene having a toluene insoluble content of 70% by mass or more.
When a vinyl acetate-based copolymer emulsion and a sulfonic acid-modified anionic polyurethane emulsion are combined, the decrease in adhesiveness and water resistance, which are the adverse effects of the compounding of the thermally expandable fine hollow particles, can be minimized. The effect of the invention is the best.

This is a polyvinyl alcohol-containing ethylene-vinyl acetate-polyfunctional monomer copolymer emulsion having a toluene insoluble content of 70% by mass or more. They are,
It can be obtained by using the manufacturing method disclosed in Japanese Patent Application Laid-Open No. 9-194811. Examples of the urethane-based emulsion having the property of being modified with sulfonic acid include an aromatic anionic urethane emulsion having a sulfonic acid group and a polyester skeleton.

Further, when high water resistance, heat resistance, boiling resistance, cold resistance, etc. are required, such as an exterior adhesive panel, a ship partitioning material, and a partition wall for a cold storage vehicle, a polyisocyanate compound is added to the adhesive of the present invention. A crosslinking agent represented by an epoxy compound can be blended.

The heat-expandable fine hollow particles are blended by heating to separate at the interface between the adhesive layer and the thermoplastic resin foam material which has become a rice cracked sheet due to volume reduction, especially shrinkage reduction. The components have a foaming ratio of 20 to 100 times and a foaming start temperature of 90 to 150 ° C. Such a heat-expandable fine hollow body is a fine hollow body, that is, a microcapsule formed of a plastic sphere having an average particle diameter of 3 to 30 µ formed in a polymer shell containing a liquid gas,
When heated, the gas pressure inside the shell increases, and the shell of the thermoplastic plastics softens, resulting in a dramatic increase in volume, resulting in hollow spherical particles. Foaming ratio is 2
In the case of the thermally expandable fine hollow body having a size of less than 0 times, the removability tends to decrease.
Therefore, it is necessary to set a high heating temperature and a long time. The average particle size of the thermally expandable fine hollow particles is very important. If the average particle size is less than 3 μm, the removability and the dispersibility during mixing may be reduced. If it exceeds 30μ, the tendency to form coarse particles during mixing increases. In particular, the present invention can be most effectively carried out by selecting a thermally expandable fine hollow body having an average particle diameter in the range of 9 to 17 μm. The plastic spheres show that acrylic polymers that do not contain chlorine compounds do not generate dioxins,
It is preferable since compatibility with the vinyl acetate copolymer emulsion and swelling power can be maximized. Commercially available products can be used for these heat-expandable fine hollow particles.
For example, EXPANCEL 053DU (Expanc
El Corporation, expansion ratio 35 times, expansion start temperature 101 ° C).

In the aqueous adhesive composition of the present invention, the mixing ratio of (A) the polymer solid content and (B) the heat-expandable fine hollow particles (powder) is independent of the composition and type of the aqueous polymer emulsion. Can be determined. That is, (B) 2 to 100 parts by mass of the heat-expandable fine hollow particles (powder) with respect to 100 parts by mass (solid content) of the polymer component (A). In consideration of the adhesiveness, water resistance, and the ability to follow the expansion of the heat-expandable fine hollow particles by the heat-expandable fine hollow particles, the content is preferably 5 to 75 parts by mass. If the amount of the component (B) is too small, the separation becomes difficult. If the amount is too large, the normal adhesive strength, water resistance, mixing property with the adhesive, poor workability when using the adhesive, and high cost tend to be increased. Occurs.

The thermoplastic resin foam material used in the thermoplastic resin foam material laminate of the present invention includes thermoplastic polymers such as polystyrene, polyethylene, polypropylene and polyvinyl chloride, and thermoplastics such as polyurethane, natural rubber and styrene-butadiene rubber. The plastic elastomer is a foaming material of a foaming material by a chemical foaming agent, an expanding agent such as a heat-expandable fine-grained hollow body, and a method of bubbling and entraining micro-bubbles. These have a softening point, are placed on a release plate such as a Teflon-treated plate, and are overheated so that the foamed layer is destroyed, and the volume is reduced, especially the shrinkage is reduced. The thickness of the rice cracked sheet varies depending on the original thickness and the expansion ratio. For example, a commercially available expansion ratio of 10
When the thermoplastic resin foam material having a thickness of about 10 to 30 mm and a thickness of about 10 to 30 mm is shrunk and reduced in volume, 0.2 to 1 mm
It is often a rice cracked sheet of about the thickness. These are commercially available thermoplastic resin foam materials which exhibit fluidity by softening usually in the range of 80 to 160 ° C. As the expansion ratio of the thermoplastic resin foam material increases, the volume can be reduced, especially the shrinkage and volume can be reduced. However, the effect of the present invention is preferably at least 5 times the expansion ratio because the shrinkage and volume reduction ratio is large.

The base material of the present invention includes wood boards such as MDF, particle board, plywood, gypsum board, flexible board, ALC plate, inorganic boards such as calcium silicate board, plastic boards such as urethane foam board and FRP board. , Metal boards, paperboard such as cardboard.

Uses of the thermoplastic resin foam laminate include styrofoam-gypsum board composite panels, polyethylene foam backing wood flooring, wood board composite boards for heat insulation, sound absorption, and weight reduction, and inorganic board composite boards. There are a composite plate with a metal plate, and a multilayer composite plate with various boards and a thermoplastic resin foam material. Its applications include building materials, vehicle, aircraft, ship bulkheads, partitions, and packaging materials such as cardboard with cushioning material.

The thermoplastic resin foam material laminate of the present invention comprises:
It can be manufactured using factory production lines commonly used in the industry. That is, usually, an adhesive application work (usually one side) is performed on a porous board surface such as a gypsum board using an applicator such as a roll spreader and a nozzle applicator or a machine.
It can be manufactured by placing a thermoplastic resin foam material thereon and crimping it by its own weight or by a press. Depending on the production line, it may be applied to one or both surfaces of a thermoplastic resin foam material or a substrate by air spray, airless spray, or the like. Further, when an aqueous contact type adhesive is used, the adhesive may be applied to both surfaces and contact-bonded.

In the present invention, (1) a step of reducing the volume by breaking foam of the thermoplastic resin foam material, particularly, a step of reducing the shrinkage, and (2) reducing the volume of the thermoplastic resin foam, particularly reducing the shrinkage of the thermoplastic resin. When the step of separating at the interface between the material and the expanded adhesive layer is performed, heat can be applied by applying heat at a temperature equal to or higher than the thermal expansion temperature of the adhesive layer and the softening temperature of the thermoplastic resin foam.

Taking the styrofoam-gypsum board composite panel as an example, 150 ° C.
If left in the atmosphere for about 20 minutes, the styrofoam shrinks on the gypsum board to reduce the volume and separates the cracked sheet. Therefore, the sheet is allowed to cool to the extent that it touches and the cracked sheet is removed. However, if only such a heating furnace is used, the heating takes a long time, and the re-peeling operation performed while hot may cause a risk of burns, etc., as a resource due to thermal deterioration of the rice cracker-shaped sheet. Quality value may be reduced.

An effective method for making a rice cracker-like sheet in a short time and separating it is to irradiate far infrared rays using a heating furnace. Here, a method of passing through a far infrared mini jet MJS-200 (manufactured by Jard) will be described. First, the heating furnace is set at 150 ° C. and the passage time is set to 4 minutes, and after confirming the temperature rise, the adhesive panel is placed on a conveyor and passed. Far-infrared irradiation (wavelength 5-30μ)
Styrofoam irradiated from the decorative metal surface of the adhesive panel and emerged from the heating furnace-Styrofoam on the surface of the gypsum board composite panel has become a cracked sheet due to shrinkage reduction, and the gypsum board is not hot, If you wear gloves, take out the rice cracker-shaped sheet and place it on a smooth table to obtain a styrene resin plate. The styrene resin plates obtained by repeating this operation can be used as a resin plate by stacking and polishing the surface, and can be used as a resin molding material by chipping it, which can be reused.

Although ultraviolet irradiation is effective instead of far infrared irradiation, it does not exceed far infrared irradiation.

[0051]

The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

(Aqueous adhesive composition in Example 1)
(A) New CH18 (manufactured by Konishi Co., Ltd., solid content concentration: 41.5 mass%, pH 5, film tensile strength: 25 MPa, elongation: 10)
0%, hereinafter referred to as "NCH18". ) To 100 parts by mass (solid content), 30 parts by mass of (B) EXPANCEL053DU (expansion ratio: 35 times, foaming start temperature: 101 ° C) as a heat-expandable fine hollow body was added and mixed well.
An aqueous adhesive composition was obtained.

(Aqueous adhesive compositions in Examples 2 to 5 and Comparative Example 1) Sumikaflex 400 (manufactured by Sumitomo Chemical Co., Ltd., solid content: Concentration 55.0% by mass, pH
5, film tensile strength 7.4 MPa, elongation 520%, hereinafter referred to as “SF400”. ), Panflex O
M-4000 (manufactured by Kuraray Co., Ltd., solid content concentration 56% by mass, pH 5, film tensile strength 4.0 MPa, elongation 10)
00%, hereinafter referred to as "OM-4000". ), Sumikaflex 480 (manufactured by Sumitomo Chemical Co., Ltd., solid content concentration 55% by mass, pH 5, film tensile strength 29 MPa,
The elongation percentage is 0%, hereinafter referred to as “SF480”. ), Panflex OM-3100 (manufactured by Kuraray Co., Ltd., solid content concentration 56% by mass, pH 5, film tensile strength 1.5MP)
a, elongation rate of 3000% or more, hereinafter, "OM-3100"
It is described. ), An aromatic anionic polyurethane emulsion modified with sulfonic acid, that is, having a polyester skeleton having a sulfonic acid group (solid content: 45% by mass, p
H8, film tensile strength 30 MPa, elongation 665%, hereinafter referred to as "S group-containing PU". ) [The above component (A)] and the thermally expandable fine hollow particles [the above component (B)]
A water-based adhesive composition was obtained in the same manner as in Example 1 except that In Table 1, the numerical values of the components A and B indicate parts by mass.

(Preparation of Thermoplastic Resin Foamed Material Laminated Samples in Examples 1 to 5 and Comparative Example 1) The obtained aqueous adhesive composition was applied to a gypsum board having a thickness of 12 mm using a rubber roll to obtain 110 g / m ^2. And then apply a 20 mm thick polystyrene foam to the surface of the aqueous adhesive composition applied, and then apply a 0.2 mm thickness at 22 ° C. atmosphere.
Pressing was performed at a pressure of 1 MPa for 1 hour. After the pressure was released, the sample was left to cure for 5 days at the same temperature to prepare a thermoplastic resin foam material laminate sample.

[0055]

[Table 1]

As described above, in Examples 1 to 4, the adhesive layer had practical adhesive strength, and was used under an atmosphere of 120 ° C. or more.
The adhesive was not adhered to the polystyrene foam even after standing to cool by leaving it for 5 minutes or irradiating it with a far-infrared irradiation device for 5 minutes in an atmosphere of 120 ° C. or more. That is, it was confirmed that the polystyrene foam could be easily peeled again in the state of interfacial peeling. Furthermore, in Example 5, by adding a sulfonic acid-modified, anionic polyurethane emulsion, the adhesive strength under normal conditions and resistance to moist heat was improved, and the mixture was further left standing in an atmosphere at 120 ° C. or higher for 20 minutes or at 120 ° C. Under the above atmosphere, 5
It was confirmed that the polystyrene foam could be peeled off again in the state of interfacial peeling even after standing to cool by irradiating for minutes. In Comparative Example 1, it was confirmed that when the heat-expandable fine hollow particles as the component (B) were not blended, it was impossible to remove again.

(Normal adhesive strength test) JIS A 161
The normal adhesive strength was measured according to the tensile test described in 2.

(Moisture and Heat Resistance Adhesion Strength Test)
Immediately after leaving for 48 hours in a 0% RH atmosphere, JIS
The adhesive strength against heat and humidity was measured according to the tensile test described in A1612.

(Repeeling Test by Irradiation of Far Infrared Light) The obtained thermoplastic resin foam material laminate sample was cut into a 150 mm square, and a far infrared ray mini jet MJS-200 (trade name) set at each temperature shown in Table 1. (Made by Jard) for 5 minutes to evaluate the state of re-peeling.

The evaluation of re-peeling is based on the following criteria. A: The polystyrene foam shrinks and reduces in volume and spontaneous peeling occurs, and the polystyrene foam can be easily peeled off even after cooling. ：: The polystyrene foam is shrunk and reduced in volume, and spontaneous peeling does not occur, but it can be easily peeled off, and the polystyrene foam can be peeled off easily even after cooling. Δ: The polystyrene foam shrinks in volume and does not spontaneously exfoliate, but can be easily exfoliated, but if it is exfoliated after standing to cool, the base material of the polystyrene foam is destroyed. X: The polystyrene foam does not shrink and reduce in volume, and the base material of the polystyrene foam is broken when peeled. The evaluation was performed in four stages, and the practical range of the present invention was ○ or more.

(Removal Test Using Ultraviolet Irradiation Apparatus) The obtained thermoplastic resin foam material laminate sample was 150 mm thick.
UV curing device Panacure NUX7328F-467 (manufactured by Matsushita Electric Works, Ltd.) cut into corners and adjusted to 150 ° C.
By passing through the inside for 10 minutes, the state of re-peeling was evaluated.

The evaluation of re-peeling is based on the following criteria. A: The polystyrene foam shrinks and reduces in volume and spontaneous peeling occurs, and the polystyrene foam can be easily peeled off even after cooling. ：: The polystyrene foam is shrunk and reduced in volume, and spontaneous peeling does not occur, but it can be easily peeled off, and the polystyrene foam can be peeled off easily even after cooling. Δ: The polystyrene foam shrinks and reduces in volume, but when peeled off after standing to cool, the base material of the polystyrene foam is broken. X: The polystyrene foam does not shrink and reduce in volume, and the base material of the polystyrene foam is broken when peeled. The evaluation was performed in four stages, and the practical range of the present invention was ○ or more.

(Removal Test Using Hot Air Circulator) The obtained thermoplastic resin foam material laminate sample was cut into 150 mm squares, and the hot air circulator HISPEC manufactured by Kusumoto Kasei Co., Ltd., which was adjusted to each temperature shown in Table 1, was prepared. By leaving it in HT210 for 20 minutes, the state of re-peeling was evaluated.

The evaluation of re-peeling is based on the following criteria. A: The polystyrene foam shrinks and reduces in volume and spontaneous peeling occurs, and the polystyrene foam can be easily peeled off even after cooling. ：: The polystyrene foam is shrunk and reduced in volume, and spontaneous peeling does not occur, but it can be easily peeled off, and the polystyrene foam can be peeled off easily even after cooling. Δ: The polystyrene foam shrinks and reduces in volume, but when peeled off after standing to cool, the base material of the polystyrene foam is broken. X: The polystyrene foam does not shrink and reduce in volume, and the base material of the polystyrene foam is broken when peeled. The evaluation was performed in four stages, and the practical range of the present invention was ○ or more.

[0065]

As described above, according to the present invention, the thermoplastic resin foam laminate is heated at a temperature not lower than the thermal expansion temperature of the adhesive layer and at least the softening temperature of the thermoplastic resin foam. Softening the resin foam and reducing the volume with destruction of the foamed state, especially shrinking and reducing the volume to make a rice cracker-like sheet,
At the interface between the rice cracker-like sheet and the film formed of the adhesive, the rice cracker-like sheet returns to a state close to the original thermoplastic resin before foaming, loses the anchoring effect, and becomes a hardly-adhered state, and becomes an unstable adhesive state. On the other hand, by heating under irradiation of far-infrared rays, etc., the adhesive is broken (separated) at the interface of the adhesive layer due to the expansion of the heat-expandable fine hollow particles incorporated in the adhesive layer.
Can be easily removed, especially the shrinkage and volume can be completely removed from the base material as a rice cracker sheet, and can be separated and recycled into plastics and boards that can be stacked and reused, etc. It has an unprecedented superior effect.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09J 201/00 C09J 201/00 // B29K 7:00 B29K 7:00 9:06 9:06 23:00 23:00 25:00 25:00 75:00 75:00 105: 04 105: 04 (72) Inventor Hiroki Kuriyama 2-1-2, Hiranocho, Chuo-ku, Osaka 5th floor of Sawano Tsuru Building Konishi Co., Ltd. Bond Business Headquarters (72) Inventor Yasunobu Uchiyama 2-1-2-2, Hirano-cho, Chuo-ku, Osaka Sawano Tsuru Building 5th Floor Konishi Co., Ltd. Bond Business Headquarters F-term (reference) 4F301 AA04 AA07 AA13 AA14 AA15 AA29 AD02 BF03 BF12 BF17 BF31 4J040 CA081 CA141 DA051 DB051 DE021 DE031 DF021 EE051 EF031 EK031 KA37 LA06 LA11 MA02 MA04 MA06 MA08 MA10 MA11 MB05 NA12 NA15 NA16

Claims (14)

[Claims] The present invention relates to a thermoplastic resin foamed material laminated through an adhesive layer having a thermal expansion function formed of an adhesive capable of adhering to a base material and a thermoplastic resin foam. By applying heat above the softening temperature of the foamed material laminate and the thermal expansion temperature of the adhesive layer, (1) the foaming of the thermoplastic resin foamed material is broken to reduce the volume of the thermoplastic resin foam, 2) A method for separating a reduced volume of a thermoplastic resin foam material laminate, comprising separating the thermoplastic resin foam material reduced in volume by expanding the adhesive layer from the substrate with the expanded adhesive layer as an interface. 2. The method for reducing the volume of a thermoplastic resin foam laminate according to claim 1, wherein the volume reduction comprises reducing the thickness of the thermoplastic resin foam. 3. The volume reduction of the thermoplastic resin foam material laminate according to claim 1, wherein the volume reduction is a shrinkage volume reduction in which the thickness and the area of the thermoplastic resin foam are reduced. Separation method. 4. The thermoplastic resin foam material comprises at least one selected from polystyrene, polyethylene, polypropylene, polyurethane, natural rubber, and styrene-butadiene rubber, and has an expansion ratio of 5 times or more. The volume reducing separation method for a thermoplastic resin foam material laminate according to any one of claims 1 to 3. 5. The heat-expandable function of the adhesive layer is provided by a heat-expandable fine-grained hollow body compounded in the adhesive layer of the thermoplastic resin foam laminate. Item 14. The method for volume-reducing separation of a thermoplastic resin foam material laminate according to item 4. 6. An adhesive layer having a heat-expanding function is prepared by adding (A) an aqueous dispersion containing a polymer having a tensile strength of a formed film after drying of 1 to 28 MPa and an elongation of 200 to 2000% to (B). 6. The volume reduction of the thermoplastic resin foam material laminate according to any one of claims 1 to 5, wherein the laminate is formed by an adhesive composed of an aqueous adhesive composition mixed with a thermally expandable fine hollow body. Separation method. 7. The aqueous dispersion containing the polymer in the component (A) may be a polyvinyl acetate polymer, a urethane polymer, an acrylic polymer, a silicone polymer,
The method for reducing the volume of a thermoplastic resin foam laminate according to claim 6, wherein the aqueous dispersion contains at least one polymer selected from a chloroprene elastomer and a styrene-butadiene elastomer. 8. The thermoplastic resin foamed material laminate according to claim 6, wherein the aqueous dispersion containing the polymer in the component (A) comprises an ethylene-vinyl acetate copolymer emulsion. Volume separation method. 9. The thermoplastic according to claim 6, wherein the aqueous dispersion containing the polymer in the component (A) comprises an ethylene-vinyl acetate copolymer emulsion and an anionic polyurethane emulsion. A method for reducing the volume of a resin foam material laminate. 10. The aqueous adhesive composition is prepared by adding 2 to 1 thermally expandable fine hollow particles of the component (B) to 100 parts by mass of the polymer solid content of the aqueous dispersion containing the polymer of the component (A).
10. The composition according to claim 6, wherein the compounded amount is 00 parts by mass.
The method for reducing the volume of a thermoplastic resin foam laminate according to any one of the above items. 11. The thermally expandable fine hollow particles of the component (B) include:
The expansion ratio is 20 to 100 times, and the foaming start temperature is 90
The method for reducing the volume of a thermoplastic resin foam material laminate according to any one of claims 6 to 10, wherein the temperature is -150 ° C. 12. The method for reducing the volume of a thermoplastic resin foam laminate according to claim 1, wherein far infrared radiation is applied to the thermoplastic resin foam laminate in a heating furnace.
12. The method for reducing the volume of a thermoplastic resin foam laminate according to any one of items 11 to 12. 13. The method for reducing the volume of a thermoplastic resin foam laminate according to claim 12, wherein the far-infrared ray is irradiated with far-infrared rays having a wavelength of 5 to 30 μm. 14. The method for reducing the volume of a thermoplastic resin foam laminate according to claim 1, wherein the thermoplastic resin foam laminate is irradiated with ultraviolet rays in a heating furnace.
The method for reducing the volume of a thermoplastic resin foam laminate according to any one of the above items.