JP2003155825A - Plastic board using spent plastic as raw material and its manufacturing method - Google Patents
Plastic board using spent plastic as raw material and its manufacturing methodInfo
- Publication number
- JP2003155825A JP2003155825A JP2002225871A JP2002225871A JP2003155825A JP 2003155825 A JP2003155825 A JP 2003155825A JP 2002225871 A JP2002225871 A JP 2002225871A JP 2002225871 A JP2002225871 A JP 2002225871A JP 2003155825 A JP2003155825 A JP 2003155825A
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- Prior art keywords
- resin
- layer
- plastic
- melt
- kneading
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、主に建材・土木用
材料に用いられるプラスチックボードに関し、例えばコ
ンクリート型枠用パネル、防音壁、敷板、建築物の床・
壁・天井用の部材、家具部材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic board mainly used for building materials and civil engineering materials, such as concrete formwork panels, soundproof walls, floor boards, floors for buildings, etc.
The present invention relates to a wall / ceiling member and a furniture member.
【0002】[0002]
【従来の技術】例えばコンクリート打設の際に用いられ
る型枠用パネルは、国内だけでも年間1億枚程度使われ
ている。型枠用パネルのほとんどが原料を南洋材とした
木材合板である。近年南洋材の使用量を削減するため
に、原料をプラスチックにしたプラスチックボードでの
木材合板の代替が試みられている。2. Description of the Related Art For example, about 100 million form panels are used annually in Japan alone when placing concrete. Most of the formwork panels are wood plywood made from Southern Ocean. In recent years, in order to reduce the amount of South Sea wood used, attempts have been made to replace wood plywood with plastic boards made of plastic.
【0003】また近年一般家庭あるいは工場等から使用
済みプラスチックが回収されている。使用済みプラスチ
ックは工場等から回収される産業廃棄物系と、一般家庭
から回収される一般廃棄物系とに分類される。これらの
使用済みプラスチックをマテリアルリサイクルすること
も種々行なわれている。In recent years, used plastics have been collected from ordinary households or factories. Used plastics are classified into industrial wastes collected from factories and general wastes collected from ordinary households. Material recycling of these used plastics is also performed in various ways.
【0004】[0004]
【発明が解決しようとする課題】コンクリート型枠用プ
ラスチックパネルを軽量多孔質構造にするために、樹脂
を溶融混練する前にあらかじめ使用済みプラスチックに
化学発泡剤を混合して溶融混練時に化学発泡剤のガス化
によって発泡させるいわゆる化学発泡法と、溶融混練時
に窒素ガスなどの不活性ガスを外部から混合して発泡状
態を形成するいわゆる物理的発泡法などが適用されたプ
ラスチックボードが製造されている。しかし使用済みプ
ラスチック、特に一般廃棄物系を原料とする場合は、新
品原料樹脂の場合と比較して、発泡ガスが微細に均一に
分散して固定化されず、個々のガス体が集合してそれら
が連鎖してガスがプラスチックボードの層内に固定化さ
れず層外に脱気して十分な多孔質軽量構造が得られない
ばかりか、前記の脱気により平滑な表面が得られない
(脱気穴に由来する凹凸が発生する)。In order to make a plastic panel for concrete formwork into a lightweight porous structure, a chemical foaming agent is mixed with a used plastic in advance before the resin is melt-kneaded, and the chemical foaming agent is used at the time of melt-kneading. Plastic boards are manufactured using the so-called chemical foaming method of foaming by gasification and the so-called physical foaming method of forming an expanded state by mixing an inert gas such as nitrogen gas from the outside during melt-kneading. . However, when used plastics, especially municipal waste, are used as raw materials, the foaming gas is finely and uniformly dispersed and not fixed, as compared to the case of new raw material resins, and individual gas bodies aggregate. They chain to each other so that the gas is not fixed in the layer of the plastic board and degassed out of the layer so that a sufficient porous lightweight structure cannot be obtained, and the degassing does not provide a smooth surface ( Irregularities due to deaeration holes occur).
【0005】すなわち、使用済みプラスチック、特に一
般廃棄物系の使用済みプラスチックは、ポリエチレン樹
脂やポリプロピレン樹脂などのポリオレフィン系樹脂を
主成分として、他の熱可塑性樹脂や熱硬化性樹脂、紙や
繊維、木材、砂、金属類などから構成される。例えば、
一般廃棄物系の使用済みプラスチックをあらかじめ水中
で比重分離して水よりも比重の小さいポリエチレン樹脂
とポリプロピレン樹脂を主体に抽出し、さらにはこれを
必要に応じて水洗浄・乾燥して原料とするものである
が、溶融混練加熱で溶融されない熱硬化性樹脂、紙や繊
維、木材、砂、金属類などの微小残渣、すなわち異物が
不可避的に混在する。異物と使用済みプラスチックとの
間には相溶性がないから、発泡ガスが溜まる隙間が生じ
る。異物は層内に多量にその表面近傍にまで含まれるの
で、異物の周囲に溜まった発泡ガスが伝播して、層の表
面まで至り、層の内部から表面まで至る抜け道から発泡
ガスが抜ける。したがって発泡ガスを層内に閉じ込めて
おくことができず、十分な多孔質軽量構造が得られない
ばかりか、表面に発泡ガスが抜けた穴ができ、平滑な表
面が得られないという問題が生じる。That is, used plastics, especially used plastics of general wastes, are mainly composed of polyolefin resins such as polyethylene resin and polypropylene resin, other thermoplastic resins and thermosetting resins, paper and fibers, Composed of wood, sand, metals, etc. For example,
Spent plastic of general waste system is separated in water in specific gravity in advance to extract mainly polyethylene resin and polypropylene resin, which have smaller specific gravity than water, and then, if necessary, this is washed and dried as raw material However, the thermosetting resin that is not melted by the melt-kneading heating, minute residues such as paper, fibers, wood, sand, and metals, that is, foreign substances are inevitably mixed. Since there is no compatibility between the foreign matter and the used plastic, a gap for accumulating the foaming gas is generated. Since the foreign matter is contained in the layer in a large amount even near the surface thereof, the foaming gas accumulated around the foreign matter propagates to reach the surface of the layer, and the foaming gas escapes from the escape path from the inside of the layer to the surface. Therefore, the foaming gas cannot be confined in the layer, so that not only a sufficient porous lightweight structure cannot be obtained, but also a hole in which the foaming gas escapes is formed on the surface, which causes a problem that a smooth surface cannot be obtained. .
【0006】本発明は、このような異物が含まれる使用
済みプラスチックを軽量多孔質構造にするために発泡さ
せた場合であっても、発泡ガスを層内に閉じ込めて目的
とする軽量発泡構造を形成してなるプラスチックボード
及びその製造方法を提供することを目的とする。According to the present invention, even when a used plastic containing such a foreign substance is foamed to form a lightweight porous structure, a foaming gas is confined in a layer to obtain a desired lightweight foamed structure. An object is to provide a formed plastic board and a method for manufacturing the same.
【0007】[0007]
【課題を解決するための手段】上記課題を解決するため
に本発明は、中心層と、該中心層の両面に設けられた表
面層とを有し、前記中心層が、溶融混練加熱で溶融され
ない異物が混在する使用済みプラスチックを原料として
溶融混練しつつ発泡させてなる多孔質構造であり、前記
表面層のマトリクス樹脂が前記中心層の主成分と相溶性
を有する樹脂からなることを特徴とする。In order to solve the above-mentioned problems, the present invention has a center layer and surface layers provided on both sides of the center layer, the center layer being melted by melt-kneading and heating. A porous structure formed by melting and kneading a used plastic in which foreign substances that are not mixed as a raw material are melt-kneaded, and the matrix resin of the surface layer is made of a resin having compatibility with the main component of the central layer. To do.
【0008】この発明によれば、中心層の両面に形成さ
れると共に中心層と相溶する表面層が、使用済みプラス
チックに異物が混在した状態であれ、中心層からのガス
の脱気を遮断して、中心層に発泡ガスを固定して安定し
て軽量発泡構造を形成させ、また平滑なボード表面を形
成させる。According to the present invention, the surface layers formed on both sides of the center layer and compatible with the center layer block the degassing of the gas from the center layer even when foreign matter is mixed in the used plastic. Then, the foaming gas is fixed to the center layer to stably form a lightweight foam structure, and to form a smooth board surface.
【0009】また表面層に、アスペクト比が10以上
の、溶融混練時の温度で軟化しない化合物を含有させる
ことにより、固体状の化合物が発泡ガスが表面層を突き
抜けるのを押さえるので、より発泡ガスの遮断効果が向
上する。また表面層が発泡構造になるのが抑制されるの
で、ボードの剛性補強効果も得られる。Further, by including a compound having an aspect ratio of 10 or more and not softened at the temperature during melt-kneading in the surface layer, the solid compound suppresses the foaming gas from penetrating the surface layer. The blocking effect of is improved. Further, since the surface layer is prevented from having a foamed structure, a rigidity reinforcing effect of the board can be obtained.
【0010】ここでアスペクト比とは、物質形状の縦横
比とも呼ばれ、一般的に板状では長さL/厚さH、繊維
状では長さL/直径Hで表される。表面層に前記のアス
ペクト比が10以上の化合物を含有しない場合において
は、前記の中心層からの発泡ガスの脱気の遮蔽効果はあ
るものの、発泡ガスの表面層への拡散は充分には抑止で
きず、前記化合物の添加が有効である。Here, the aspect ratio is also called an aspect ratio of a material shape, and is generally expressed by a length L / thickness H in a plate shape and a length L / diameter H in a fibrous shape. In the case where the surface layer does not contain the compound having the aspect ratio of 10 or more, there is an effect of shielding the degassing of the foaming gas from the central layer, but the diffusion of the foaming gas to the surface layer is sufficiently suppressed. No, it is effective to add the compound.
【0011】前記化合物がマイカであり、前記表面層へ
のマイカの添加量が5質量%以上であることが望まし
い。It is desirable that the compound is mica and the amount of mica added to the surface layer is 5% by mass or more.
【0012】マイカは、通称雲母であり、鱗片状の形状
であり、おそらくはその形状効果により前記の表面層内
におけるガスの拡散を抑止する効果が大きい。またマイ
カは化学的に安定であり剛性も高いことから、特にアル
カリ性を呈するコンクリートに対する耐久性や、コンク
リート離型剤に含まれる溶剤への耐久性や、また高い剛
性が要求されるコンクリート型枠用ボードとして好適な
効果を得ることができる。5質量%未満では大きな効果
は得られない。Mica, which is commonly called mica, has a scaly shape, and probably has a great effect of suppressing gas diffusion in the surface layer due to its shape effect. In addition, since mica is chemically stable and has high rigidity, it is particularly durable for concrete that exhibits alkalinity, durability for the solvent contained in the concrete release agent, and for concrete formwork that requires high rigidity. It is possible to obtain a suitable effect as a board. If it is less than 5% by mass, a large effect cannot be obtained.
【0013】前記使用済みプラスチックは、複数種のプ
ラスチックが混在される一般廃棄物系の使用済みプラス
チックであり、前記表面層のマトリクス樹脂がポリオレ
フィン系樹脂を主成分とすることが望ましい。The used plastic is a waste-based used plastic in which a plurality of types of plastics are mixed, and it is desirable that the matrix resin of the surface layer contains a polyolefin resin as a main component.
【0014】一般廃棄物系の使用済みプラスチックは、
複数種のプラスチックが混在され、材質毎に選別されて
いないから、従来これを原料としてのプラスチック製品
はほとんど見当たらず、しかも溶融混練しつつ発泡させ
てなる軽量多孔質構造は従来例がない。本発明者らの検
討により、例えば一般廃棄物系を比重分離して得られる
軽比重分が熱可塑性のポリオレフィン系樹脂が主体であ
り、不特定かつ異物が混在する状態であれ、溶融混練し
つつ発泡させることが可能で、さらに表面層を両面に形
成させることにより、良好な軽量多孔質構造が形成でき
ることを見出し成し得た。The used plastics of general waste system are
Since a plurality of types of plastics are mixed and not sorted according to the material, plastic products using this as a raw material have hardly been found in the past, and there is no conventional lightweight porous structure formed by melting and kneading. According to the study of the present inventors, for example, the light specific gravity obtained by separating the specific gravity of a general waste system is mainly a thermoplastic polyolefin resin, and it is melt-kneaded even if it is in a state where unspecified and foreign substances are mixed. It has been found that it is possible to foam and to form a good lightweight porous structure by forming surface layers on both sides.
【0015】表面層のマトリクス樹脂がポリオレフィン
系樹脂を主成分とすることは、前記の知見に基づき、中
心層の主成分がポリオレフィン系樹脂であることから、
それと相溶しうるポリオレフィン系樹脂をマトリクス樹
脂とすることに着眼したものであるが、数多くの一般廃
棄物系について試験を繰り返した結果、中心層の成分・
組成が不特定で異物が混在した状態であれ、中心層に相
溶して、さらには後述のボード表面の平滑化効果が安定
して得られることを見出し成し得た。The fact that the matrix resin of the surface layer contains a polyolefin resin as a main component is based on the above findings, since the main component of the central layer is a polyolefin resin,
The focus was on using a polyolefin resin that is compatible with it as a matrix resin, but as a result of repeating tests on many general waste systems, the components of the central layer
It has been found that, even if the composition is unspecified and foreign matter is mixed, it is compatible with the central layer, and the smoothing effect of the board surface described later can be stably obtained.
【0016】表面層のマトリクス樹脂の原料は、発泡ガ
スを伝播させないという観点からも、異物が含まれてい
ない樹脂であることが望ましい。ここで異物が含まれて
いない樹脂には、例えば新品原料の樹脂等のみならず、
取り除こうとしても不可避的に異物が含まれている樹
脂、例えば紙、繊維、木屑、金属は含まれないが、極く
微量の汚れ、塵埃等が不可避的に含まれる産業廃棄物系
プラスチックの再生樹脂等も含まれる。The raw material of the matrix resin for the surface layer is preferably a resin containing no foreign matter, from the viewpoint of not propagating the foaming gas. Here, the resin that does not contain foreign matter is, for example, not only a new raw material resin,
Recycling of industrial waste plastics that contain inevitably foreign substances even if you try to remove them, such as paper, fibers, wood chips, and metals, but inevitably contains a very small amount of dirt, dust, etc. Resins and the like are also included.
【0017】また本発明は、中心層と、該中心層の両面
に設けられた表面層とを有するプラスチックボードの製
造方法であって、中心層を形成するための、溶融混練加
熱で溶融されない異物が混在する使用済みプラスチック
を溶融混練しつつ発泡する工程と、前記表面層を形成す
るための前記マトリクス樹脂を溶融混練して、前記中心
層の両面に加熱状態で相溶させて一体化する工程と、一
体化した溶融樹脂をボード帯状に押出し冷却固化させる
工程とを有することを特徴とするプラスチックボードの
製造方法としても構成することができる。Further, the present invention is a method for producing a plastic board having a center layer and surface layers provided on both sides of the center layer, wherein the foreign matter that is not melted by the melt-kneading heating for forming the center layer. A step of foaming while melting and mixing a used plastic mixed with a step, and a step of melt-kneading the matrix resin for forming the surface layer and compatibilizing both surfaces of the central layer in a heated state to integrate them. And a step of extruding the integrated molten resin into a board band shape and cooling and solidifying the resin board, the method can be configured as a plastic board manufacturing method.
【0018】[0018]
【発明の実施の形態】以下本発明の一実施形態における
プラスチックボードについて説明する。本発明のプラス
チックボードは、例えばコンクリート型枠用パネル、防
音壁、敷板、建築物の床・壁・天井用の部材、家具部材
に用いられるが、この実施形態ではコンクリート型枠用
プラスチックパネルに用いた場合について説明する。BEST MODE FOR CARRYING OUT THE INVENTION A plastic board according to an embodiment of the present invention will be described below. The plastic board of the present invention is used, for example, for concrete formwork panels, soundproof walls, floorboards, members for floors / walls / ceilings of buildings, and furniture members. In this embodiment, it is used for concrete formwork plastic panels. The case where there is a case will be described.
【0019】図1は本発明の一実施形態におけるプラス
チックボードとしてのコンクリート型枠用プラスチック
パネルを示す。このコンクリート型枠用プラスチックパ
ネルは、気泡3…を有する中心層1の両面に気泡を有し
ない表面層2,2が設けられており、所謂3層構造から
なっている。FIG. 1 shows a plastic panel for concrete formwork as a plastic board in one embodiment of the present invention. This plastic panel for concrete formwork has a so-called three-layer structure in which surface layers 2 and 2 having no bubbles are provided on both sides of a center layer 1 having bubbles 3.
【0020】この実施形態では、中心層1の原料として
一般廃棄物系の使用済みプラスチックを用いている。こ
こで産業廃棄物系の使用済みプラスチックを事業活動に
伴って生じた廃プラスチックと定義し、一般廃棄物系の
使用済みプラスチックを一般家庭から廃棄される容器包
装類の廃プラスチックと定義する。容器包装リサイクル
法により一般家庭から廃棄される容器包装プラスチック
は分別回収が義務付けられている。In this embodiment, used plastic of general waste system is used as a raw material of the central layer 1. Here, used plastics of industrial waste are defined as waste plastics generated by business activities, and used plastics of general waste are defined as waste plastics of containers and packaging discarded from general households. According to the Containers and Packaging Recycling Law, it is obligatory to separate and collect containers and packaging plastics discarded from ordinary households.
【0021】容器包装プラスチックの中でペットボトル
だけは特別に分別され、回収されたペットボトル以外の
容器包装プラスチックはベール梱包されてコンクリート
型枠用プラスチックパネルの製造工場に搬送される。工
場ではベール梱包された容器包装プラスチックを解砕機
で解砕後、例えば固形・ボトル系のプラスチックとフィ
ルム系のプラスチックとに選別する。フィルム系のプラ
スチックは破砕機で破砕後、比重差分離機で洗浄しなが
ら比重分離される。Among the container-wrapping plastics, only the PET bottles are specially separated, and the collected container-wrapping plastics other than the PET bottles are bale-packed and transported to the factory for manufacturing plastic panels for concrete formwork. In the factory, the bale-packaged plastics are crushed by a crusher and then sorted into, for example, solid / bottle plastics and film plastics. The film plastic is crushed by a crusher and then separated by specific gravity while being washed by a specific gravity difference separator.
【0022】具体的には一般廃棄物系の使用済みプラス
チックは、ポリエチレン樹脂やポリプロピレン樹脂など
のポリオレフィン系樹脂を主成分として、他の熱可塑性
樹脂や熱硬化性樹脂、紙や繊維、木材、砂、金属類など
から構成される。これらのプラスチック以外の異物を分
離するために、風選、磁選、比重分離、濾過装置等適当
な手段が用いられる。本実施形態では、一般廃棄物系の
使用済みプラスチックをあらかじめ水中で比重分離して
水よりも比重の小さいポリエチレン樹脂とポリプロピレ
ン樹脂を主体に抽出し、さらにはこれを必要に応じて水
洗浄・乾燥して原料とする。Specifically, the used plastics of general waste are mainly composed of polyolefin resin such as polyethylene resin or polypropylene resin, and other thermoplastic resin or thermosetting resin, paper or fiber, wood, sand. , Metal, etc. Appropriate means such as wind separation, magnetic separation, specific gravity separation, and filtration are used to separate these foreign substances other than plastic. In the present embodiment, used plastics of general waste system are previously separated in water by specific gravity to extract mainly polyethylene resin and polypropylene resin, which have a specific gravity smaller than water, and are further washed with water and dried as necessary. And use as raw material.
【0023】なお、性状が近いフィルム系のプラスチッ
クのみを中心層1の原料として用いることが望ましい
が、ボトル系のプラスチックを中心層1の原料として用
いても良い。また中心層1の原料はその全体が使用済み
プラスチックであることが望ましいが、その一部に使用
済みプラスチックを用い、残部に異物が含まれていない
樹脂を用いることも可能である。It is desirable to use only film-type plastics having similar properties as the raw material of the center layer 1, but bottle-type plastics may be used as the raw material of the center layer 1. Further, it is desirable that the whole material of the central layer 1 is used plastic, but it is also possible to use used plastic for a part of the raw material and use resin containing no foreign matter for the rest.
【0024】図2は比重差分離機の一例を示す。この比
重差分離機は、比重1の水を使った場合は、比重が1よ
り大きいものを高比重分として分離し、比重が1より小
さいものを低比重分として分離する。高比重分には塩ビ
(比重1.4)、PET(比重1.3)、PS(比重
1.1)、熱硬化性樹脂、異物(金属、土・砂、紙等)
が挙げられる。低比重分には、PE(比重0.9)、P
P(比重0.9)、発泡スチロール等の異物が挙げられ
る。低比重分のプラスチックは乾燥後、造粒機で造粒さ
れる。FIG. 2 shows an example of the specific gravity difference separator. When using water having a specific gravity of 1, this specific gravity difference separator separates those having a specific gravity of more than 1 as a high specific gravity component, and those having a specific gravity of less than 1 as a low specific gravity component. For high specific gravity, PVC (specific gravity 1.4), PET (specific gravity 1.3), PS (specific gravity 1.1), thermosetting resin, foreign matter (metal, earth / sand, paper, etc.)
Is mentioned. PE (specific gravity 0.9), P for low specific gravity
Foreign substances such as P (specific gravity 0.9) and Styrofoam can be mentioned. The low specific gravity plastic is dried and then granulated by a granulator.
【0025】中心層1は木材合板に近く軽量化するため
に気泡を有する多孔質構造とされる。中心層1の発泡率
(気泡含有によるみかけ比重と気泡を含有しない状態で
の比重(真比重)との比率)は、従来の発泡法を用いて
例えば50〜80%とされる。ここで従来の発泡法に
は、原料を加熱・溶融しているときに高圧ガスを注入す
る物理発泡法や化学的発泡法を用いることができる。The central layer 1 has a porous structure having air bubbles in order to make it lighter and closer to the plywood. The foaming rate (ratio of apparent specific gravity due to inclusion of bubbles and specific gravity (true specific gravity) in the absence of bubbles) of the central layer 1 is, for example, 50 to 80% by using a conventional foaming method. Here, as the conventional foaming method, a physical foaming method or a chemical foaming method in which a high-pressure gas is injected while heating and melting a raw material can be used.
【0026】図3に示すように使用済みプラスチック
は、新品原料樹脂の場合と比較して、発泡ガスが微細に
均一に分散して固定化されず、個々のガス体が集合して
それらが連鎖してガスが中心層1内に固定化されず層外
に脱気して十分な多孔質軽量構造が得られないばかり
か、前記の脱気により平滑な表面が得られない(脱気穴
に由来する凹凸)。As shown in FIG. 3, in the used plastic, the foaming gas is finely and uniformly dispersed and not fixed, as compared with the case of a new raw material resin, and individual gas bodies are aggregated to form a chain. As a result, the gas is not fixed in the central layer 1 and degassed to the outside of the layer so that a sufficient porous lightweight structure cannot be obtained. In addition, a smooth surface cannot be obtained due to the above degassing. Unevenness derived from).
【0027】上述のように一般廃棄物系の使用済みプラ
スチックは、ポリエチレン樹脂やポリプロピレン樹脂な
どのポリオレフィン系樹脂を主成分として、他の熱可塑
性樹脂や熱硬化性樹脂、紙や繊維、木材、砂、金属類な
どから構成される。一般廃棄物系の使用済みプラスチッ
クをあらかじめ水中で比重分離して水よりも比重の小さ
いポリエチレン樹脂とポリプロピレン樹脂を主体に抽出
し、さらにはこれを必要に応じて水洗浄・乾燥して原料
とするものであるが、溶融混練加熱で溶融されない熱硬
化性樹脂、紙や繊維、木材、砂、金属類などの微小残
渣、すなわち異物が不可避的に混在し、この異物を核と
して、前記の個々のガス体の集合・連鎖、それによる前
記悪影響が生じる。As described above, the used plastics of general waste are mainly composed of polyolefin resin such as polyethylene resin and polypropylene resin, and other thermoplastic resin or thermosetting resin, paper or fiber, wood, sand. , Metal, etc. Spent plastic of general waste system is separated in water in specific gravity in advance to extract mainly polyethylene resin and polypropylene resin, which have smaller specific gravity than water, and then, if necessary, this is washed and dried as raw material However, the thermosetting resin that is not melted by the melt-kneading heating, minute residues such as paper and fibers, wood, sand, and metals, that is, foreign substances are inevitably mixed, and these foreign substances are used as cores to Aggregation / chain of gas bodies and the above-mentioned adverse effects are caused thereby.
【0028】発泡ガスが中心層1内に固定化されず層外
に脱気するのを防止するために、図4に示すように中心
層1の両面に表面層2,2を設ける。表面層2,2は、
気泡を含有しない構造とされ、中心層1からの発泡ガス
の脱気を遮蔽して、中心層1に発泡ガスを固定して安定
して軽量発泡構造を形成させる。また、平滑なボード表
面を形成させる。As shown in FIG. 4, surface layers 2 and 2 are provided on both sides of the center layer 1 in order to prevent the foaming gas from being fixed inside the center layer 1 and degassing outside the layer. The surface layers 2 and 2 are
It has a structure that does not contain bubbles, blocks degassing of the foaming gas from the center layer 1, and fixes the foaming gas to the center layer 1 to form a stable lightweight foam structure. It also forms a smooth board surface.
【0029】表面層2,2のマトリクス樹脂は中心層1
の主成分PE,PPと相溶性を有するポリオレフィン系
樹脂からなる。コンクリート型枠用プラスチックパネル
に必要な強度を付与するための表面層2,2は、中心層
1と強固に接合している必要がある。接着強度とコスト
の点から、接着剤よりも溶融接着等で、製造時に一体と
して成形することが好ましい。このためにも、表面層
2,2が中心層1の主成分と相溶性を有する合成樹脂か
らなることが好ましい。中心層1に用いる使用済みプラ
スチック(容器包装類などの一般廃棄物系プラスチッ
ク)の主成分はPE、PP、PS、PET、PVC、P
VDCであり、比重分離等の手段で脱塩ビを行うと、中
心層1の主成分はポリオレフィン系樹脂であるPE、P
Pとなるので、表面層2,2のマトリクス樹脂はポリオ
レフィン系樹脂を主成分とすることが好ましい。表面層
2,2の原料を使用済みでない新品原料のPE又はPP
とすることも可能だし、また表面層2,2の剛性を損な
わない範囲であれば、リサイクル樹脂(産業廃棄物系の
使用済みプラスチック)を混合して用いることも可能で
ある。The matrix resin for the surface layers 2 and 2 is the central layer 1
It is made of a polyolefin resin compatible with the main components PE and PP. The surface layers 2 and 2 for imparting necessary strength to the plastic panel for concrete form must be firmly bonded to the center layer 1. From the viewpoint of adhesive strength and cost, it is preferable to use melt-bonding or the like rather than an adhesive to integrally form it during manufacturing. For this reason, it is preferable that the surface layers 2 and 2 are made of a synthetic resin compatible with the main component of the central layer 1. The main component of the used plastic (general waste plastic such as containers and packaging) used for the central layer 1 is PE, PP, PS, PET, PVC, P.
In the case of VDC, the main component of the center layer 1 is PE or P, which is a polyolefin resin, when dechlorinated by means such as specific gravity separation.
Since it becomes P, it is preferable that the matrix resin of the surface layers 2 and 2 has a polyolefin resin as a main component. PE or PP that is a new raw material that has not used the raw materials of the surface layers 2 and 2
It is also possible to use, and it is also possible to mix and use recycled resin (used plastic of industrial waste system) as long as the rigidity of the surface layers 2 and 2 is not impaired.
【0030】本実施形態ではポリオレフィン系樹脂がポ
リプロピレン樹脂であるとさらに好ましい。中心層1の
溶融混練は通常180〜250℃の範囲内で行い、その
直後の溶融状態において中心層1と表面層2,2を相溶
させ短時間に冷却固化させるには比較的融点の高い樹脂
が好ましく、またポリプロピレン樹脂は比較的剛性が高
く、化学的にも安定、また比較的安価でもあり工業的に
好適である。(参考までに、中心層1主成分のポリエチ
レン樹脂の融点:90〜120℃程度、ポリプロピレン
樹脂の融点:130〜160℃程度が主体)。In this embodiment, the polyolefin resin is more preferably a polypropylene resin. The melting and kneading of the central layer 1 is usually performed within the range of 180 to 250 ° C., and in order to make the central layer 1 and the surface layers 2 and 2 compatible with each other in the molten state immediately after that, to have a relatively high melting point in order to cool and solidify. Resin is preferred, and polypropylene resin is industrially suitable because it has relatively high rigidity, is chemically stable, and is relatively inexpensive. (For reference, the melting point of the polyethylene resin which is the main component of the central layer 1 is about 90 to 120 ° C., and the melting point of the polypropylene resin is about 130 to 160 ° C.).
【0031】図1に示すように表面層2,2には、溶融
混練時の温度で軟化しない高軟化点の化合物4が含有さ
れる。高軟化点の化合物4とは、溶融混練時の温度で軟
化して大きく形状を崩さない化合物であればよく、通
常、本実施形態の溶融混練は180〜250℃の範囲内
で行うことから、その範囲内で軟化して大きく形状を崩
さないものであればよい。無機質の板状の化合物が好適
であり、タルク、マイカ、セリサイト、板状の炭酸カル
シウムや板状の水酸化アルミニウムなどが挙げられる。
また、ガラス繊維や針状酸化マグネシウムや、微細PE
Tフレークなども使用することができる。As shown in FIG. 1, the surface layers 2 and 2 contain a compound 4 having a high softening point which does not soften at the temperature during melt kneading. The compound 4 having a high softening point may be any compound that is softened at the temperature during melt kneading and does not largely lose its shape. Usually, the melt kneading of the present embodiment is performed within the range of 180 to 250 ° C., Any material may be used as long as it is softened within the range and does not largely lose its shape. Inorganic plate-like compounds are suitable, and examples thereof include talc, mica, sericite, plate-like calcium carbonate, plate-like aluminum hydroxide, and the like.
In addition, glass fiber, acicular magnesium oxide, fine PE
T flakes and the like can also be used.
【0032】表面層2,2にアスペクト比が10以上の
高軟化点の化合物4を含有せしめることにより、発泡ガ
スの遮蔽効果が向上し、さらにはボードの剛性補強効果
が得られる。表面層2,2にアスペクト比が10以上の
高軟化点の化合物を含有しない場合においては、中心層
1からの発泡ガスの脱気の遮蔽効果はあるものの、発泡
ガスの表面層2,2への拡散は充分には抑止できず、高
軟化点の化合物4の添加が有効である。By including the compound 4 having a high softening point having an aspect ratio of 10 or more in the surface layers 2 and 2, the effect of shielding foaming gas is improved, and the effect of reinforcing the rigidity of the board is obtained. When the surface layers 2 and 2 do not contain a compound having an aspect ratio of 10 or higher and a high softening point, the degassing effect of the foaming gas from the central layer 1 has an effect of shielding the foaming gas from the surface layers 2 and 2. Can not be sufficiently suppressed, and the addition of compound 4 having a high softening point is effective.
【0033】本実施形態では高軟化点の化合物としてマ
イカを用いる。図5は平均アスペクト比65のマイカの
形状を示す。マイカは、通称雲母であり、鱗片状の形状
であり、おそらくはその形状効果により前記の表面層内
におけるガスの拡散を抑止する効果が大きい。またマイ
カは化学的に安定であり剛性も高いことから、アルカリ
性を呈するコンクリートに対する耐久性や、コンクリー
ト離型剤に含まれる溶剤への耐久性や、また高い剛性が
要求されるコンクリート型枠用ボードとして好適な効果
を得ることができる。5質量%未満では大きな効果は得
られない。In this embodiment, mica is used as a compound having a high softening point. FIG. 5 shows the shape of mica with an average aspect ratio of 65. Mica is a so-called mica, and has a scaly shape, and probably has a large effect of suppressing the diffusion of gas in the surface layer due to its shape effect. In addition, since mica is chemically stable and has high rigidity, durability against alkaline concrete, durability against the solvent contained in the concrete mold release agent, and concrete form board that requires high rigidity As a result, a suitable effect can be obtained. If it is less than 5% by mass, a large effect cannot be obtained.
【0034】図1に示すように製造されたパネル全体の
厚さは例えば11.5〜12.0mmに設定され、表面
層2,2の厚さはそれぞれ例えば1.0〜1.5mmに
設定される。製造されたパネルの比重は約0.65〜
0.75g/cm3で、曲げ剛性(曲げヤング係数)は10
〜20×103kgf/cm2である。またプラスチックパネル
の大きさは例えば600×1800mmである。このプ
ラスチックパネルには桟木が取り付けられ、型枠として
使用される。The thickness of the whole panel manufactured as shown in FIG. 1 is set to, for example, 11.5 to 12.0 mm, and the thickness of the surface layers 2 and 2 is set to, for example, 1.0 to 1.5 mm. To be done. The specific gravity of the manufactured panel is about 0.65
0.75 g / cm 3 and flexural rigidity (Young's modulus of bending) is 10
It is about 20 × 10 3 kgf / cm 2 . The size of the plastic panel is, for example, 600 × 1800 mm. A wooden bar is attached to this plastic panel and is used as a formwork.
【0035】コンクリート型枠用プラスチックパネルの
製造方法について説明する。図6はコンクリート型枠用
プラスチックパネルの製造装置を示す。一般廃棄物系の
使用済みプラスチックをあらかじめ水中で比重分離して
水よりも比重の小さいポリエチレン樹脂とポリプロピレ
ン樹脂を主体に抽出し、さらにはこれを必要に応じて水
洗浄・乾燥して原料中心層の原料とする。次に押出成形
機5に中心層1を形成するための使用済みプラスチック
を装入し、押出成形機5内で溶融混練しつつ、ガスを封
入して発泡する。また表面層2の原料としてマイカを混
合させたポリプロピレン樹脂を用い、このポリプロピレ
ン樹脂を押出成形機6内で溶融混練する。次に2種3層
Tダイ7を用いて、溶融混練した表面層2を形成するた
めのポリプレン樹脂を、中心層1を形成するための使用
済みプラスチックの両面に加熱状態で相溶させて一体化
する。一体化した溶融樹脂をボード帯状に押出し冷却固
化させる。発泡ガスが表面層2内で伝播するのをより防
止するためには、2種3層Tダイ7で溶融樹脂を一体化
させてTダイから押出した直後に冷却固化させるのが望
ましい。最後に冷却固化させた帯状のボードを所定の大
きさに切断する。A method of manufacturing a plastic panel for concrete formwork will be described. FIG. 6 shows an apparatus for manufacturing a plastic panel for concrete formwork. The used waste plastic of general waste is separated in water in specific gravity to extract mainly polyethylene resin and polypropylene resin, which have a smaller specific gravity than water, and this is washed and dried as necessary to form the center layer of the raw material. As the raw material of. Next, a used plastic for forming the center layer 1 is charged into the extrusion molding machine 5, and while being melt-kneaded in the extrusion molding machine 5, gas is enclosed and foaming is performed. Further, a polypropylene resin mixed with mica is used as a raw material for the surface layer 2, and the polypropylene resin is melt-kneaded in the extrusion molding machine 6. Next, using a type 2 three-layer T-die 7, the melt-kneaded polyprene resin for forming the surface layer 2 is made compatible with both sides of the used plastic for forming the central layer 1 in a heated state and integrated. Turn into. The integrated molten resin is extruded in the shape of a board strip to be cooled and solidified. In order to further prevent the foaming gas from propagating in the surface layer 2, it is desirable that the molten resin is integrated by the two-kind three-layer T die 7 and is cooled and solidified immediately after being extruded from the T die. Finally, the band-shaped board that has been cooled and solidified is cut into a predetermined size.
【0036】なお本発明は上記実施形態に限られず種々
変更可能である。例えば中心層の原料には一般廃棄物系
の使用済みプラスチックのみならず、産業廃棄物系の使
用済みプラスチックを混合して用いてもよい。また本発
明の目的・効果を損なわない範囲内で中心層及び表面層
には、例えば、着色顔料、難燃化剤、耐候安定化剤、酸
化防止剤、などその他の添加剤を含有することもでき
る。The present invention is not limited to the above embodiment, and various modifications can be made. For example, as the raw material for the central layer, not only general waste waste plastics but also industrial waste waste plastics may be mixed and used. Further, the central layer and the surface layer may contain other additives such as a color pigment, a flame retardant, a weather resistance stabilizer, an antioxidant, etc. within a range that does not impair the objects and effects of the present invention. it can.
【0037】[0037]
【実施例1】一般廃棄物系の使用済みプラスチックを、
樹脂押出機において、約200℃で溶融混練しつつ、窒
素ガスを封入して発泡させ、それをボード帯状に押出し
て直ちに冷却金属ロールにて冷却固化してボードを作製
した。[Example 1] Used waste-based plastic
In a resin extruder, while melting and kneading at about 200 ° C., nitrogen gas was enclosed and foamed, which was extruded into a board strip shape and immediately cooled and solidified by a cooling metal roll to produce a board.
【0038】図7は表面層を設けない比較例を示す。表
面層を設けない場合、発泡ガスが微細に均一に分散して
固定化されず、個々のガス体が集合してそれらが連鎖し
てガスが中心層内に固定化されず層外に脱気して十分な
多孔質軽量構造が得られないばかりか、前記の脱気によ
り平滑な表面が得られない(脱気穴に由来する凹凸が発
生する)のがわかる。FIG. 7 shows a comparative example in which no surface layer is provided. When the surface layer is not provided, the foaming gas is finely and uniformly dispersed and is not fixed, and individual gas bodies aggregate and chain them, and the gas is not fixed in the central layer and degassed outside the layer. As a result, it is found that not only a sufficient porous lightweight structure cannot be obtained, but also a smooth surface cannot be obtained by the above deaeration (irregularities due to deaeration holes occur).
【0039】図8はポリプロピレン樹脂を表面層として
一体押出しした例を示す。表面層を両面に形成すること
で、良好な多孔質構造が形成することができ、平滑な表
面が得られる。FIG. 8 shows an example in which polypropylene resin is integrally extruded as a surface layer. By forming the surface layers on both sides, a favorable porous structure can be formed, and a smooth surface can be obtained.
【0040】[0040]
【実施例2】図9は表面層がポリプロピレン樹脂のみの
例を示す。表面層により中心層の発泡ガスが遮蔽され表
面が平滑化しているものの、表面層にガスが拡散して充
分な剛性向上効果が発揮されないのがわかる。Example 2 FIG. 9 shows an example in which the surface layer is made of polypropylene resin only. It can be seen that although the foaming gas in the central layer is shielded by the surface layer and the surface is smoothed, the gas diffuses into the surface layer and a sufficient rigidity improving effect is not exhibited.
【0041】図10は表面層が、ポリプロピレン樹脂を
マトリクス樹脂として、平均アスペクト比65のマイカ
を20質量%含有している例を示す。この図10から発
泡ガスの表面層への拡散が抑止されているのがわかる。
あわせて剛性が向上している。FIG. 10 shows an example in which the surface layer contains polypropylene resin as a matrix resin and contains 20% by mass of mica having an average aspect ratio of 65. It can be seen from FIG. 10 that the diffusion of the foaming gas to the surface layer is suppressed.
The rigidity is also improved.
【0042】[0042]
【実施例3】一般廃棄物系の使用済みプラスチックを、
樹脂押出機において、約200℃で溶融混練しつつ、窒
素ガスを封入して発泡させ中心層を形成させ、一方ポリ
プロピレン樹脂をマトリクス樹脂としてそれに平均アス
ペクト比65のマイカを0〜30質量%添加混合して溶
融混練した樹脂を厚さ1.2mmで前記の中心層に溶融
状態で一体化相溶させ、これらを板厚12mmのボード
帯状に一体押出して直ちに冷却金属ロールにて冷却固化
してボードを作製した。[Example 3] Used plastic of general waste system
In a resin extruder, while melting and kneading at about 200 ° C., nitrogen gas is enclosed and foamed to form a central layer, while polypropylene resin is used as a matrix resin and 0 to 30% by mass of mica having an average aspect ratio of 65 is added and mixed. The melt-kneaded resin having a thickness of 1.2 mm is integrally compatibilized with the central layer in a molten state, and these are integrally extruded into a board strip having a plate thickness of 12 mm and immediately cooled and solidified by a cooling metal roll to obtain a board. Was produced.
【0043】図11は表面層へのマイカ添加量と曲げ剛
性(曲げヤング係数)の関係を示す。表面層無しでは、
発泡ガスの脱気により表面が凹凸で曲げヤング係数も低
い。ポリプロピレン樹脂を表面層として形成すると表面
は平滑化されかつ曲げ剛性も向上するのがわかる。さら
にポリプロピレン樹脂をマトリクス樹脂としてマイカを
添加することにより曲げ剛性はさらに大きく向上する。
ただし、2質量%では効果はなく5質量%以上で効果が
あった。FIG. 11 shows the relationship between the amount of mica added to the surface layer and the bending rigidity (Young's modulus of bending). Without the surface layer,
The surface is uneven due to the degassing of the foaming gas, and the bending Young's modulus is also low. It can be seen that when the polypropylene resin is formed as the surface layer, the surface is smoothed and the bending rigidity is improved. Further, the bending rigidity is further improved by adding mica as a matrix resin of polypropylene resin.
However, 2% by mass had no effect and 5% by mass or more had an effect.
【0044】[0044]
【実施例4】一般廃棄物系の使用済みプラスチックを、
樹脂押出機において、約200℃で溶融混練しつつ、窒
素ガスを封入して発泡させ中心層を形成させ、一方ポリ
プロピレン樹脂をマトリクス樹脂としてそれに平均アス
ペクト比5〜95のマイカを12質量%と、着色顔料と
して白色の微粒子チタニアを2質量%添加混合して溶融
混練した樹脂を前記の中心層に溶融状態で厚さ1.2m
mで一体化相溶させ、これらを板厚12mmのボード帯
状に一体押出して直ちに冷却金属ロールにて冷却固化し
てボードを作製した。[Embodiment 4] Used plastics of general waste system,
In a resin extruder, while melting and kneading at about 200 ° C., nitrogen gas was enclosed and foamed to form a central layer, while polypropylene resin was used as a matrix resin and 12% by mass of mica having an average aspect ratio of 5 to 95, A resin obtained by adding and mixing 2% by mass of white fine particle titania as a coloring pigment and melt-kneading it to the above central layer in a molten state has a thickness of 1.2 m.
m was made compatible with each other, and these were integrally extruded into a board strip having a plate thickness of 12 mm and immediately cooled and solidified by a cooling metal roll to prepare a board.
【0045】図12は表面層添加マイカの平均アスペク
ト比と曲げ剛性(曲げヤング係数)の関係を示す。マイ
カを添加することにより曲げ剛性は大きく向上する。た
だし、平均アスペクト比が5では効果が小さく10以上
で大きな効果があった。平均アスペクト比が40程度に
なると十分な剛性が得られ、それ以上アスペクト比を上
げてもあまり剛性が向上しないのがわかった。FIG. 12 shows the relationship between the average aspect ratio of the surface layer-added mica and the bending rigidity (Young's modulus of bending). Bending rigidity is greatly improved by adding mica. However, the effect was small when the average aspect ratio was 5, and the large effect was obtained when the average aspect ratio was 10 or more. It was found that sufficient rigidity was obtained when the average aspect ratio was about 40, and the rigidity did not improve so much even if the aspect ratio was increased further.
【0046】[0046]
【発明の効果】以上述べたように、本発明によれば、中
心層の両面に形成されると共に中心層と相溶する表面層
が、使用済みプラスチックに異物が混在した状態であ
れ、中心層からのガスの脱気を遮断して、中心層に発泡
ガスを固定して安定して軽量発泡構造を形成させ、また
平滑なボード表面を形成させる。As described above, according to the present invention, the surface layers formed on both sides of the center layer and compatible with the center layer can be used even if foreign matter is mixed in the used plastic. The degassing of the gas from is blocked, and the foaming gas is fixed to the central layer to stably form a lightweight foam structure and form a smooth board surface.
【図1】本発明の一実施形態におけるプラスチックボー
ドとしてのコンクリート型枠用プラスチックパネルを示
す断面図。FIG. 1 is a cross-sectional view showing a plastic panel for concrete formwork as a plastic board according to an embodiment of the present invention.
【図2】比重差分離機の一例を示す断面図。FIG. 2 is a sectional view showing an example of a specific gravity difference separator.
【図3】表面層を設けていない中心層を発泡させた状態
を示す断面図。FIG. 3 is a cross-sectional view showing a state in which a center layer having no surface layer is foamed.
【図4】表面層を設けた中心層を発泡させた状態を示す
断面図。FIG. 4 is a cross-sectional view showing a state where a center layer provided with a surface layer is foamed.
【図5】平均アスペクト比65以上のマイカの形状を示
す図。FIG. 5 is a diagram showing the shape of mica having an average aspect ratio of 65 or more.
【図6】コンクリート型枠用プラスチックパネルの製造
装置を示す図。FIG. 6 is a view showing an apparatus for manufacturing a plastic panel for concrete formwork.
【図7】表面層を設けない比較例を示す図。FIG. 7 is a diagram showing a comparative example in which a surface layer is not provided.
【図8】ポリプロピレン樹脂を表面層として一体押出し
した例を示す図。FIG. 8 is a view showing an example in which polypropylene resin is integrally extruded as a surface layer.
【図9】表面層がポリプロピレン樹脂のみの例を示す
図。FIG. 9 is a view showing an example in which the surface layer is made of polypropylene resin only.
【図10】ポリプロピレン樹脂をマトリクス樹脂とし
て、平均アスペクト比65のマイカを20質量%含有し
ている例を示す図。FIG. 10 is a view showing an example in which polypropylene resin is used as a matrix resin and contains 20% by mass of mica having an average aspect ratio of 65.
【図11】表面層へのマイカ添加量と曲げ剛性(曲げヤ
ング係数)の関係を示すグラフ。FIG. 11 is a graph showing the relationship between the amount of mica added to the surface layer and bending rigidity (Young's modulus of bending).
【図12】表面層添加マイカの平均アスペクト比と曲げ
剛性(曲げヤング係数)の関係を示すグラフ。FIG. 12 is a graph showing the relationship between the average aspect ratio of surface layer-added mica and the bending rigidity (Young's modulus of bending).
1…中心層 2…表面層 3…気泡 4…化合物 1 ... Center layer 2 ... Surface layer 3 ... bubbles 4 ... Compound
───────────────────────────────────────────────────── フロントページの続き (72)発明者 鶴田 秀和 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 上崎 章正 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 鈴木 克紀 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 (72)発明者 河崎 健 東京都千代田区丸の内一丁目1番2号 日 本鋼管株式会社内 Fターム(参考) 4F100 AC05B AC05C AK01A AK07 AL05A AL05B AL05C AT00A AT00B AT00C BA03 BA06 BA10B BA10C DJ01A EC03 EC032 EH23 EH232 EJ02 EJ022 GB07 GB08 JB04B JB04C JL03 JL16A ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hidekazu Tsuruta 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Akimasa Uezaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Katsunori Suzuki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. (72) Inventor Ken Kawasaki 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Main Steel Pipe Co., Ltd. F term (reference) 4F100 AC05B AC05C AK01A AK07 AL05A AL05B AL05C AT00A AT00B AT00C BA03 BA06 BA10B BA10C DJ01A EC03 EC032 EH23 EH232 EJ02 EJ022 GB07 GB08 JB04B JB04C JL03 JL16A
Claims (7)
表面層とを有し、 前記中心層が、溶融混練加熱で溶融されない異物が混在
する使用済みプラスチックを原料として溶融混練しつつ
発泡させてなる多孔質構造であり、 前記表面層のマトリクス樹脂が前記中心層の主成分と相
溶性を有する樹脂からなることを特徴とするプラスチッ
クボード。1. A center layer and surface layers provided on both sides of the center layer, wherein the center layer is melt-kneaded from a used plastic containing foreign substances that are not melted by melt-kneading heating as a raw material. A plastic board having a porous structure formed by foaming, wherein the matrix resin of the surface layer is made of a resin compatible with the main component of the central layer.
の、溶融混練時の温度で軟化しない化合物を含有するこ
とを特徴とする請求項1に記載のプラスチックボード。2. The plastic board according to claim 1, wherein the surface layer contains a compound having an aspect ratio of 10 or more and not softened at a temperature during melt kneading.
へのマイカの添加量が5質量%以上であることを特徴と
する請求項1又は2に記載のプラスチックボード。3. The plastic board according to claim 1, wherein the compound is mica, and the amount of mica added to the surface layer is 5% by mass or more.
プラスチックが混在され、材質毎に選別されていない一
般廃棄物系の使用済みプラスチックであり、 前記表面層のマトリクス樹脂がポリオレフィン系樹脂を
主成分とすることを特徴とする請求項1乃至3いずれか
に記載のプラスチックボード。4. The used plastic is a used plastic of a general waste type in which a plurality of types of plastics are mixed and not sorted by material, and the matrix resin of the surface layer is mainly composed of a polyolefin type resin. The plastic board according to any one of claims 1 to 3, wherein:
前記異物が含まれていない樹脂であることを特徴とする
請求項1ないし4いずれかに記載のプラスチックボー
ド。5. The raw material of the matrix resin for the surface layer is
The plastic board according to any one of claims 1 to 4, which is a resin containing no foreign matter.
表面層とを有するプラスチックボードの製造方法であっ
て、 中心層を形成するための、溶融混練加熱で溶融されない
異物が混在する使用済みプラスチックを溶融混練しつつ
発泡する工程と、 前記表面層を形成するための前記マトリクス樹脂を溶融
混練して、前記中心層の両面に加熱状態で相溶させて一
体化する工程と、 一体化した溶融樹脂をボード帯状に押出し冷却固化させ
る工程とを有することを特徴とするプラスチックボード
の製造方法。6. A method of manufacturing a plastic board having a center layer and surface layers provided on both sides of the center layer, wherein foreign matter that is not melted by melt-kneading heating for forming the center layer is mixed. A step of foaming while melt-kneading the used plastic; a step of melt-kneading the matrix resin for forming the surface layer and compatibilizing both surfaces of the central layer in a heated state to integrate them; And a step of extruding the solidified molten resin into a board band and cooling and solidifying the resin.
では、あらかじめ前記マトリクス樹脂にアスペクト比が
10以上の、溶融混練時の温度で軟化しない化合物が混
合されていることを特徴とする請求項6に記載のプラス
チックボードの製造方法。7. In the step of melt-kneading the matrix resin, a compound having an aspect ratio of 10 or more and not softened at a temperature during melt-kneading is mixed in advance with the matrix resin. A method for manufacturing the described plastic board.
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JP2001-267950 | 2001-09-04 | ||
JP2001267950 | 2001-09-04 | ||
JP2002225871A JP3528841B2 (en) | 2001-09-04 | 2002-08-02 | Plastic board made from used plastic as raw material and method for producing the same |
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JP2003155825A true JP2003155825A (en) | 2003-05-30 |
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100789957B1 (en) | 2007-03-28 | 2008-01-02 | 주식회사 제이한 | Double extrusion panel manufacturing system and method using waste plastic materials |
KR100963183B1 (en) | 2007-12-10 | 2010-06-14 | 상호수지 주식회사 | Device recycling waste-plastics, and products manufactured by the same |
KR100963185B1 (en) | 2007-12-10 | 2010-06-14 | 상호수지 주식회사 | Device recycling waste-plastics, and products manufactured by the same |
KR100963182B1 (en) | 2007-12-10 | 2010-06-14 | 상호수지 주식회사 | Device recycling waste-plastics, and products manufactured by the same |
GB2519249A (en) * | 2014-01-07 | 2015-04-15 | Environmental Technology Evolution Ltd | Process and apparatus for manufacturing a multilayer article |
EP2182138A4 (en) * | 2007-07-27 | 2016-07-27 | Ulma C Y E S Coop | Method and unit for producing rigid, recyclable polymer sandwich panels, without the use of adhesives, and resulting panel |
-
2002
- 2002-08-02 JP JP2002225871A patent/JP3528841B2/en not_active Expired - Lifetime
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR100789957B1 (en) | 2007-03-28 | 2008-01-02 | 주식회사 제이한 | Double extrusion panel manufacturing system and method using waste plastic materials |
WO2008117947A1 (en) * | 2007-03-28 | 2008-10-02 | Jhan Co., Ltd. | Double extrusion panel manufacturing system and method using waste plastic materials |
EP2182138A4 (en) * | 2007-07-27 | 2016-07-27 | Ulma C Y E S Coop | Method and unit for producing rigid, recyclable polymer sandwich panels, without the use of adhesives, and resulting panel |
KR100963183B1 (en) | 2007-12-10 | 2010-06-14 | 상호수지 주식회사 | Device recycling waste-plastics, and products manufactured by the same |
KR100963185B1 (en) | 2007-12-10 | 2010-06-14 | 상호수지 주식회사 | Device recycling waste-plastics, and products manufactured by the same |
KR100963182B1 (en) | 2007-12-10 | 2010-06-14 | 상호수지 주식회사 | Device recycling waste-plastics, and products manufactured by the same |
GB2519249A (en) * | 2014-01-07 | 2015-04-15 | Environmental Technology Evolution Ltd | Process and apparatus for manufacturing a multilayer article |
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