JP2002012691A - Method for extrusion molding of foamed vinyl chloride resin tubular material - Google Patents

Method for extrusion molding of foamed vinyl chloride resin tubular material

Info

Publication number
JP2002012691A
JP2002012691A JP2000194542A JP2000194542A JP2002012691A JP 2002012691 A JP2002012691 A JP 2002012691A JP 2000194542 A JP2000194542 A JP 2000194542A JP 2000194542 A JP2000194542 A JP 2000194542A JP 2002012691 A JP2002012691 A JP 2002012691A
Authority
JP
Japan
Prior art keywords
vinyl chloride
chloride resin
tubular body
resin
weight
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.)
Pending
Application number
JP2000194542A
Other languages
Japanese (ja)
Inventor
Sakae Haruna
栄 春名
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Original Assignee
Sekisui Chemical Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sekisui Chemical Co Ltd filed Critical Sekisui Chemical Co Ltd
Priority to JP2000194542A priority Critical patent/JP2002012691A/en
Publication of JP2002012691A publication Critical patent/JP2002012691A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/92—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92009—Measured parameter
    • B29C2948/92114—Dimensions
    • B29C2948/92152—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92323—Location or phase of measurement
    • B29C2948/92438—Conveying, transporting or storage of articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92504—Controlled parameter
    • B29C2948/92609—Dimensions
    • B29C2948/92647—Thickness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2948/00—Indexing scheme relating to extrusion moulding
    • B29C2948/92—Measuring, controlling or regulating
    • B29C2948/92819—Location or phase of control
    • B29C2948/92933—Conveying, transporting or storage of articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/94—Lubricating
    • B29C48/95—Lubricating by adding lubricant to the moulding material

Abstract

PROBLEM TO BE SOLVED: To provide a method for extrusion molding of a foamed vinyl chloride resin tubular material, capable of using a recycled vinyl chloride resin without a hitch in the extrusion molding of the foamed vinyl chloride resin tubular material. SOLUTION: This method for extrusion molding is to extrude for molding a tubular material from a composition containing a vinyl chloride resin, thermally decomposable type blowing agent, methacrylic acid ester-based resin and filler, in which the recycled vinyl chloride resin for at least a part of the vinyl chloride resin is used, and only an inorganic thermally decomposable type blowing agent is used as the thermally decomposable type blowing agent.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明はリサイクル塩化ビニ
ル樹脂を使用した発泡塩化ビニル樹脂管状体の押出成形
方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for extruding a foamed vinyl chloride resin tubular body using recycled vinyl chloride resin.

【０００２】[0002]

【従来の技術】発泡塩化ビニル樹脂管状体は、断熱管、
消音管等として有用である。この発泡塩化ビニル樹脂管
状体は、通常、発泡性塩化ビニル樹脂組成物の押出成形
により押出成形され、その発泡性塩化ビニル樹脂組成物
として、塩化ビニル樹脂に、アゾジカルボンアミド、ス
ルホニルヒドラジド等の有機系熱分解型発泡剤、重炭酸
ナトリウム等の無機系熱分解型発泡剤、メタクリル酸エ
ステル系樹脂及び充填剤を配合したものが公知である
（特公昭６３−９５４０号公報）。2. Description of the Related Art A foamed vinyl chloride resin tubular body is made of an insulating tube,
It is useful as a silencer. The foamed vinyl chloride resin tubular body is usually extruded by extrusion of a foamable vinyl chloride resin composition, and as the foamable vinyl chloride resin composition, an organic material such as azodicarbonamide, sulfonyl hydrazide or the like is added to vinyl chloride resin. It is known to blend a thermal decomposition type foaming agent, an inorganic thermal decomposition type foaming agent such as sodium bicarbonate, a methacrylate resin and a filler (Japanese Patent Publication No. 63-9540).

【０００３】[0003]

【発明が解決しようとする課題】近来、資源循環のため
に樹脂管状体の原料においても、リサイクルが要請され
ている。そこで、本発明者は、上記発泡性塩化ビニル樹
脂組成物の塩化ビニル樹脂に、リサイクル塩化ビニル樹
脂を使用して発泡塩化ビニル樹脂管状体を押出成形する
ことを試みたが、発泡が不安定であり、問題があること
を認識した。その理由は、アゾジカルボンアミド、スル
ホニルヒドラジド等の有機系熱分解型発泡剤の分解速度
（ガス発生量）が、リサイクル塩化ビニル樹脂に含まれ
ている金属石ケン、特に、安定剤によって影響を受ける
（鉛系安定剤の場合は、分解速度が速く、錫系安定剤、
特にメルカプト錫系安定剤の場合は、分解速度が遅い）
と共にリサイクル塩化ビニル樹脂の溶融粘度特性が、樹
脂の重合度、熱安定剤の種類・添加量、滑剤の種類・添
加量、充填剤の種類・添加量等により左右される結果、
経時的に樹脂組成物のガス発生量と溶融粘度特性が変動
するためである。Recently, there has been a demand for recycling of raw materials for resin tubular bodies for resource recycling. Then, the present inventor tried to extrude a foamed vinyl chloride resin tubular body using recycled vinyl chloride resin to the vinyl chloride resin of the foamable vinyl chloride resin composition, but the foaming was unstable. Yes, I realized there was a problem. The reason is that the decomposition rate (gas generation amount) of an organic pyrolysis type foaming agent such as azodicarbonamide and sulfonyl hydrazide is affected by the metal soap contained in the recycled vinyl chloride resin, particularly the stabilizer. (In the case of a lead-based stabilizer, the decomposition rate is high, and a tin-based stabilizer,
In particular, in the case of a mercaptotin-based stabilizer, the decomposition rate is low.)
As a result, the melt viscosity characteristics of the recycled vinyl chloride resin are affected by the degree of polymerization of the resin, the type and amount of heat stabilizer, the type and amount of lubricant, and the type and amount of filler,
This is because the amount of gas generated and the melt viscosity characteristics of the resin composition fluctuate with time.

【０００４】ここで、アゾジカルボンアミド、スルホニ
ルヒドラジド等の有機系熱分解型発泡剤の分解速度が、
リサイクル塩化ビニル樹脂に含まれている安定剤によっ
て影響を受けるのは、例えば、アゾジカルボンアミドの
場合、[0004] Here, the decomposition rate of organic thermal decomposition type blowing agents such as azodicarbonamide and sulfonyl hydrazide is as follows.
It is affected by the stabilizer contained in the recycled vinyl chloride resin, for example, in the case of azodicarbonamide,

【化１】 の（１）〜（５）に示すように複雑な分解過程で分解さ
れるところ、この分解反応に対し安定剤が触媒として作
用し、リサイクル塩化ビニル樹脂中の安定剤の種類や量
が異なると、反応過程が変わって各過程での反応速度も
相違することになるためと推定される。Embedded image As shown in (1) to (5), the stabilizer is decomposed in a complicated decomposition process, and the stabilizer acts as a catalyst for this decomposition reaction. If the type and amount of the stabilizer in the recycled vinyl chloride resin are different, It is presumed that the reaction process changes and the reaction speed in each process also differs.

【０００５】かかる不安定な発泡のもとでは、発泡塩化
ビニル樹脂管状体の肉厚変動が避けられない。リサイク
ル塩化ビニル樹脂を用いない通常の発泡塩化ビニル樹脂
の押出成形では、肉厚変動が小さく、引取り機の調整で
肉厚修正できるが、前記リサイクル塩化ビニル樹脂に起
因する肉厚変動の場合は、その変動が大きいために引取
り機の調整では対処し難い。[0005] Under such unstable foaming, fluctuations in the thickness of the foamed vinyl chloride resin tubular body cannot be avoided. In the extrusion molding of ordinary foamed vinyl chloride resin without using recycled vinyl chloride resin, the thickness variation is small and the thickness can be corrected by adjusting the take-off machine, but in the case of the thickness variation caused by the recycled vinyl chloride resin, However, it is difficult to cope with the adjustment of the take-up machine due to the large fluctuation.

【０００６】而して、発泡塩化ビニル樹脂管状体の押出
成形に、リサイクル塩化ビニル樹脂を支障なく使用でき
るようにするには、リサイクル塩化ビニル樹脂中の安定
剤に左右されることなく一定の発泡倍率で安定に発泡さ
せ得る発泡性塩化ビニル樹脂組成物、または、引取り速
度の調整に依存することなく発泡塩化ビニル樹脂管状体
の肉厚を一定にできる方法の出現が要請される。[0006] In order to make it possible to use the recycled vinyl chloride resin in the extrusion molding of the foamed vinyl chloride resin tubular body, it is necessary to use a certain amount of foam regardless of the stabilizer in the recycled vinyl chloride resin. There is a demand for a foamable vinyl chloride resin composition capable of stably foaming at a magnification or a method capable of making the wall thickness of a foamed vinyl chloride resin tubular body constant without depending on the adjustment of the take-off speed.

【０００７】本発明の目的は、発泡塩化ビニル樹脂管状
体の押出成形にリサイクル塩化ビニル樹脂を支障なく良
好に使用できる発泡塩化ビニル樹脂管状体の押出成形方
法を提供することにあり、更に、詳しくは、リサイクル
塩化ビニル樹脂を用いるにもかかわらず発泡倍率の安定
化を図り、または、発泡倍率の変動にもかかわらず肉厚
一定化を保証して、発泡塩化ビニル樹脂管状体を良好に
押出成形できる方法を提供することにある。An object of the present invention is to provide a method for extruding a foamed vinyl chloride resin tubular body, which can use a recycled vinyl chloride resin satisfactorily in the extrusion molding of a foamed vinyl chloride resin tubular body. Aims to stabilize the expansion ratio despite the use of recycled vinyl chloride resin, or to guarantee a constant wall thickness despite fluctuations in the expansion ratio, and to extrude the foamed vinyl chloride resin tubular body well. It is to provide a method that can be performed.

【０００８】[0008]

【課題を解決するための手段】本発明に係る発泡塩化ビ
ニル樹脂管状体の押出成形方法は、塩化ビニル樹脂、熱
分解型発泡剤、メタクリル酸エステル系樹脂及び充填剤
を含有する組成物から管状体を押出成形する方法であ
り、塩化ビニル樹脂の少なくとも一部にリサイクル塩化
ビニル樹脂を使用し、熱分解型発泡剤に無機系熱分解型
発泡剤のみを用いることを特徴とする構成であり、リサ
イクル塩化ビニル樹脂には、粒径２ｍｍ以下の粉砕粒体
を用い、塩化ビニル樹脂１００重量部に対しメタクリル
酸エステル系樹脂を２〜２０重量部、充填剤を５〜２０
重量部とし、押出成形体の発泡倍率を２倍以下とするこ
とが好ましい。SUMMARY OF THE INVENTION According to the present invention, there is provided a method for extruding a foamed vinyl chloride resin tubular body, comprising a step of forming a tubular article from a composition containing a vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin and a filler. It is a method of extruding a body, using recycled vinyl chloride resin for at least a part of the vinyl chloride resin, and using only an inorganic thermal decomposition type foaming agent as the thermal decomposition type foaming agent, For the recycled vinyl chloride resin, pulverized particles having a particle size of 2 mm or less are used, and 2 to 20 parts by weight of a methacrylate ester resin and 5 to 20 parts by weight of a filler are added to 100 parts by weight of the vinyl chloride resin.
It is preferable that the foaming ratio be 2 parts by weight or less.

【０００９】本発明に係る他の発泡塩化ビニル樹脂管状
体の押出成形方法は、塩化ビニル樹脂、熱分解型発泡
剤、メタクリル酸エステル系樹脂及び充填剤を含有する
組成物から管状体を押出成形する方法であり、塩化ビニ
ル樹脂の少なくとも一部ににリサイクル塩化ビニル樹脂
を使用し、熱分解型発泡剤に４，４’−オキシビス（ベ
ンゼンスルホニルホドラジド）またはジニトロソペンタ
メチレンテトラミンを用いることを特徴とする構成であ
り、リサイクル塩化ビニル樹脂には、粒径２ｍｍ以下の
粉砕粒体を用い、塩化ビニル樹脂１００重量部に対しメ
タクリル酸エステル系樹脂を２〜２０重量部、充填剤を
５〜２０重量部とすることが好ましい。Another method for extruding a foamed vinyl chloride resin tubular body according to the present invention is to extrude a tubular body from a composition containing a vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin, and a filler. Using recycled vinyl chloride resin for at least a part of the vinyl chloride resin, and using 4,4'-oxybis (benzenesulfonyl hydrazide) or dinitrosopentamethylenetetramine for the pyrolytic foaming agent. In the recycled vinyl chloride resin, pulverized particles having a particle size of 2 mm or less are used, and 2 to 20 parts by weight of a methacrylate ester resin and 5 to 5 parts by weight of a filler are used for 100 parts by weight of the vinyl chloride resin. It is preferable to set it to 20 parts by weight.

【００１０】本発明に係る他の発泡塩化ビニル樹脂管状
体の押出成形方法は、リサイクル塩化ビニル樹脂を含む
塩化ビニル樹脂、熱分解型発泡剤、メタクリル酸エステ
ル系樹脂及び充填剤を含有する組成物を押出成形し、発
泡塩化ビニル樹脂管状体の肉厚変動に応じ上記熱分解型
発泡剤の押出機への供給量を調節することによってその
肉厚を調整することを特徴とする構成である。[0010] Another extrusion molding method for a foamed vinyl chloride resin tubular body according to the present invention is a composition comprising a vinyl chloride resin containing a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylic ester resin, and a filler. Is extruded, and the thickness is adjusted by adjusting the supply amount of the pyrolytic foaming agent to the extruder according to the thickness variation of the foamed vinyl chloride resin tubular body.

【００１１】本発明に係る他の発泡塩化ビニル樹脂管状
体の押出成形方法は、三層押出しで、しかも、中間層
を、リサイクル塩化ビニル樹脂を含む塩化ビニル樹脂、
熱分解型発泡剤、メタクリル酸エステル系樹脂及び充填
剤を含有する組成物の発泡層にして三層管状体を押出成
形し、発泡中間層の肉厚変動に応じ上記熱分解型発泡剤
の押出機への供給量を調節することによってその発泡中
間層肉厚を調整することを特徴とする構成である。[0011] Another method of extrusion molding a foamed vinyl chloride resin tubular body according to the present invention is a three-layer extrusion method, wherein the intermediate layer is made of a vinyl chloride resin containing recycled vinyl chloride resin.
Extruding a three-layer tubular body into a foamed layer of a composition containing a pyrolytic foaming agent, a methacrylic acid ester-based resin and a filler, and extruding the pyrolytic foaming agent according to the thickness variation of the foamed intermediate layer. The thickness of the foamed intermediate layer is adjusted by adjusting the supply amount to the machine.

【００１２】[0012]

【発明の実施の形態】請求項１〜４に係る発泡塩化ビニ
ル樹脂管状体の押出成形方法は、リサイクル塩化ビニル
樹脂、熱分解型発泡剤、メタクリル酸エステル系樹脂及
び充填剤を含有する組成物から管状体を押出成形する場
合、熱分解型発泡剤に無機系熱分解型発泡剤を使用すれ
ば、リサイクル塩化ビニル樹脂に含有された安定剤に影
響されることなく、一定の発泡倍率で安定に発泡させ得
るという、予想外の知見に基づいている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The method for extruding a foamed vinyl chloride resin tubular body according to any one of claims 1 to 4 is a composition comprising a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin and a filler. When extruding a tubular body from, if an inorganic pyrolysis type foaming agent is used as the pyrolysis type foaming agent, it is stable at a constant expansion ratio without being affected by the stabilizer contained in the recycled vinyl chloride resin. It is based on an unexpected finding that it can be foamed to a certain extent.

【００１３】上記無機系熱分解型発泡剤には、例えば、
重炭酸ナトリウム、重炭酸アンモニウム、炭酸アンモニ
ウム等を使用できる。上記発泡性塩化ビニル樹脂組成物
の発泡倍率は、熱分解型発泡剤の分解ガス量（分解速
度）の外、樹脂の溶融粘度特性によっても律せられる。
而して、加工助剤として使用される上記メタクリル酸エ
ステル系樹脂の添加量を調整して組成物の溶融粘度特性
を安定化することも有効であり、メタクリル酸エステル
系樹脂の添加量を、塩化ビニル樹脂量１００重量部に対
し２〜２０重量部とすることが好ましい。この樹脂の溶
融粘度特性の安定化は、トルクレオメ−タの定常トルク
を一定にすることにほかならず、２重量未満では、溶融
粘度が低すぎて気泡が大きくなり過ぎ、２０重量部を越
えると、樹脂が硬くなり過ぎ、発泡させ難くなる。上記
無機系熱分解型発泡剤の添加量は、樹脂１００重量部に
対し０．１〜２．０重量部とされ、非常に少量であるか
ら、均一分散による一様発泡を図るために、リサイクル
塩化ビニル樹脂には、可及的に細かく粉砕したものを使
用することが有効であり、２ｍｍ以下（２ｍｍ×２ｍｍ
メッシュ通過）の粉砕粒を用いることが好ましい。上記
充填剤は、発泡過程における核剤としても作用するの
で、その添加量を樹脂１００重量部に対し５〜２０重量
部とすることが好ましい。５重量部未満では、核が少な
すぎて部分的な異常発泡が生じ易く、２０重量部を越え
ると、核が多すぎて発泡セルが充分に成長しなくなるか
らである。周知の通り、高発泡の場合は、発泡空間が成
形体中に占める割合が高く、連続気泡になり易く、低発
泡の場合は、成形体中の発泡空間が占める割合が小さ
く、連続気泡になり難く、上記発泡塩化ビニル樹脂管状
体の用途上、独立気泡とすることが要求される場合は、
発泡倍率を２倍以下にすれば、後述する通り、独立気泡
率９０％以上を保証できる。The above-mentioned inorganic thermal decomposition type foaming agents include, for example,
Sodium bicarbonate, ammonium bicarbonate, ammonium carbonate and the like can be used. The expansion ratio of the foamable vinyl chloride resin composition is determined not only by the amount of decomposition gas (decomposition rate) of the thermal decomposition type foaming agent but also by the melt viscosity characteristics of the resin.
Thus, it is also effective to stabilize the melt viscosity characteristics of the composition by adjusting the amount of the methacrylate-based resin used as a processing aid, and to adjust the amount of the methacrylate-based resin to be added. The amount is preferably 2 to 20 parts by weight based on 100 parts by weight of the vinyl chloride resin. Stabilization of the melt viscosity characteristics of this resin is not limited to keeping the steady torque of the torque rheometer constant. If it is less than 2 parts by weight, the melt viscosity is too low and the bubbles become too large. The resin becomes too hard and hardly foams. The amount of addition of the inorganic thermal decomposition type foaming agent is 0.1 to 2.0 parts by weight with respect to 100 parts by weight of the resin, and is very small. It is effective to use as fine as possible a vinyl chloride resin, and it is effective to use a resin having a size of 2 mm or less (2 mm × 2 mm
It is preferable to use pulverized particles (mesh passing). Since the filler also acts as a nucleating agent in the foaming process, the amount of the filler is preferably 5 to 20 parts by weight based on 100 parts by weight of the resin. If the amount is less than 5 parts by weight, the number of nuclei is too small and partial abnormal foaming is liable to occur. As is well known, in the case of high foaming, the proportion of the foaming space in the molded article is high, and it is easy to become open cells. In the case of low foaming, the proportion of the foaming space in the molded article is small, and it becomes open cells. Difficult, in the case of the use of the foamed vinyl chloride resin tubular body, when it is required to be closed cells,
If the expansion ratio is set to 2 times or less, a closed cell ratio of 90% or more can be guaranteed as described later.

【００１４】請求項１〜４に係る発泡塩化ビニル樹脂管
状体の押出成形方法は、発泡性塩化ビニル樹脂組成物の
単一層管状体の押出成形、中間層材質を上記発泡性塩化
ビニル樹脂組成物とする三層管状体の押出成形の外、金
属管等の管材への発泡性塩化ビニル樹脂組成物の押出被
覆成形にも使用することができる。The method for extruding a foamed vinyl chloride resin tubular body according to claims 1 to 4, comprises extruding a single-layer tubular body of the foamable vinyl chloride resin composition, and setting the intermediate layer material to the foamable vinyl chloride resin composition. In addition to the extrusion molding of the three-layer tubular body described above, it can also be used for extrusion coating molding of a foamable vinyl chloride resin composition to a pipe material such as a metal pipe.

【００１５】請求項５〜７に係る発泡塩化ビニル樹脂管
状体の押出成形方法は、リサイクル塩化ビニル樹脂、熱
分解型発泡剤、メタクリル酸エステル系樹脂及び充填剤
を含有する組成物から管状体を押出成形する場合、熱分
解型発泡剤に４，４’−オキシビス（ベンゼンスルホニ
ルホドラジド）（０ＢＳＨ）またはジニトロソペンタメ
チレンテトラミン（ＤＰＴ）を使用すれば、リサイクル
塩化ビニル樹脂の安定剤に影響されることなく、一定の
発泡倍率で安定に発泡させ得る、予想外の知見に基づい
ている。According to a fifth aspect of the present invention, there is provided a method for extruding a tubular vinyl chloride resin body, comprising forming a tubular body from a composition containing a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin, and a filler. In the case of extrusion molding, the use of 4,4'-oxybis (benzenesulfonyl hydrazide) (0BSH) or dinitrosopentamethylenetetramine (DPT) as a pyrolytic foaming agent affects the stability of recycled vinyl chloride resin. It is based on an unexpected finding that foaming can be stably performed at a constant expansion ratio without being performed.

【００１６】この予想外の結果が得られる理由は、推測
の域を脱しないが、その分解過程が、The reason why this unexpected result is obtained is that it does not go beyond speculation, but its decomposition process

【化２】 に示すように、単一の反応分解経路であり、前記式
（１）〜（５）で示すような複雑な多経路分解過程を経
る場合とは異なり、リサイクル塩化ビニル樹脂に含まれ
る安定剤が異なっても、その分解経路が変わる余地があ
り得ずにガス発生量の変動が抑えられるためと推定され
る。Embedded image As shown in the above, unlike the case where the reaction is a single reactive decomposition route and undergoes a complicated multi-path decomposition process as shown in the above formulas (1) to (5), the stabilizer contained in the recycled vinyl chloride resin is Even if they are different, it is presumed that there is no room for changing the decomposition route, and the fluctuation of the gas generation amount is suppressed.

【００１７】この場合も、発泡性塩化ビニル樹脂組成物
の発泡倍率は、熱分解型発泡剤の分解ガス量（分解速
度）の外、樹脂の溶融粘度特性によってもで律せられ、
樹脂の溶融粘度特性を一定化するために、メタクリル酸
エステル系樹脂の添加量を、塩化ビニル樹脂量１００重
量部に対し２〜２０重量部とすることが好ましい。この
樹脂の溶融粘度特性の一定化は、トルクレオメ−タの定
常トルクを一定にすることにほかならず、２重量未満で
は、溶融粘度が低すぎて気泡が大きくなり過ぎ、２０重
量部を越えると、樹脂が硬くなり過ぎ、発泡させ難くな
る。上記４，４’−オキシビス（ベンゼンスルホニルホ
ドラジド）またはジニトロソペンタメチレンテトラミン
の添加量は、樹脂１００重量部に対し０．１〜２．０重
量部であり非常に少量であるから、均一分散による一様
発泡を図るために、リサイクル塩化ビニル樹脂には、可
及的に細かく粉砕したものを使用することが有効であ
り、２ｍｍ以下（２ｍｍ×２ｍｍメッシュ通過）の粉砕
粒を用いることが好ましい。上記充填剤は、発泡過程に
おける核剤としても作用するので、その添加量を樹脂１
００重量部に対し５〜２０重量部とすることが好まし
い。５重量部未満では、核が少なすぎて部分的な異常発
泡が生じ易く、２０重量部を越えると、核が多すぎて発
泡セルが充分に成長しなくなるからである。Also in this case, the expansion ratio of the foamable vinyl chloride resin composition is determined not only by the amount of decomposition gas (decomposition rate) of the thermal decomposition type foaming agent but also by the melt viscosity characteristics of the resin.
In order to stabilize the melt viscosity characteristics of the resin, the amount of the methacrylic acid ester-based resin is preferably 2 to 20 parts by weight based on 100 parts by weight of the vinyl chloride resin. In order to make the melt viscosity characteristic of the resin constant, the steady torque of the torque rheometer must be kept constant. If it is less than 2 parts by weight, the melt viscosity is too low and the bubbles become too large. The resin becomes too hard and hardly foams. The amount of the above 4,4'-oxybis (benzenesulfonyl hydrazide) or dinitrosopentamethylenetetramine is 0.1 to 2.0 parts by weight per 100 parts by weight of the resin, which is very small. In order to achieve uniform foaming by dispersion, it is effective to use as fine as possible a recycled vinyl chloride resin, and it is effective to use crushed particles of 2 mm or less (2 mm x 2 mm mesh passing). preferable. The above-mentioned filler also acts as a nucleating agent in the foaming process.
It is preferably 5 to 20 parts by weight based on 00 parts by weight. If the amount is less than 5 parts by weight, the number of nuclei is too small and partial abnormal foaming is liable to occur. If the amount is more than 20 parts by weight, the number of nuclei is too large and the foam cells do not grow sufficiently.

【００１８】請求項５〜７に係る発泡塩化ビニル樹脂管
状体の押出成形方法は、発泡性塩化ビニル樹脂組成物の
単一層管状体の押出成形、中間層材質を上記発泡性塩化
ビニル樹脂組成物とする三層管状体の押出成形の外、金
属管等の管材への発泡性塩化ビニル樹脂組成物の押出被
覆成形にも使用することができる。According to a fifth aspect of the present invention, there is provided a method for extruding a foamed vinyl chloride resin tubular body, comprising: extruding a single-layer tubular body of the foamable vinyl chloride resin composition; In addition to the extrusion molding of the three-layer tubular body described above, it can also be used for extrusion coating molding of a foamable vinyl chloride resin composition to a pipe material such as a metal pipe.

【００１９】本発明において、上記塩化ビニル樹脂は、
リサイクル塩化ビニル樹脂単独とすることもできるが、
リサイクル塩化ビニル樹脂による溶融粘度のバラツキを
軽減するために、リサイクル塩化ビニル樹脂と同量以上
のバ−ジン塩化ビニル樹脂との併用とすることが好まし
い。リサイクル塩化ビニル樹脂とバ−ジン塩化ビニル樹
脂とを併用する場合、バ−ジン塩化ビニル樹脂に対する
安定剤を添加する必要があり、その安定剤としては、三
塩基性硫酸鉛のような鉛系安定剤、ステアリン酸カドミ
ウムのようなカドミウム系安定剤、ステアリン酸バリウ
ムのようなバリウム系安定剤、ステアリン酸カルシウム
のようなカルシウム系安定剤、ステアリン酸亜鉛のよう
な亜鉛系安定剤、ジブチル錫ラウレ−トのような有機錫
系安定剤等を挙げることができる。In the present invention, the vinyl chloride resin is
Recycled vinyl chloride resin alone can be used,
In order to reduce the variation in the melt viscosity due to the recycled vinyl chloride resin, it is preferable to use the same amount or more of the recycled vinyl chloride resin as the virgin vinyl chloride resin. When a recycled vinyl chloride resin and a virgin vinyl chloride resin are used in combination, it is necessary to add a stabilizer for the virgin vinyl chloride resin, and the stabilizer is a lead-based stabilizer such as tribasic lead sulfate. Agents, cadmium stabilizers such as cadmium stearate, barium stabilizers such as barium stearate, calcium stabilizers such as calcium stearate, zinc stabilizers such as zinc stearate, dibutyltin laurate And organic tin-based stabilizers such as

【００２０】上記リサイクル塩化ビニル樹脂やバ−ジン
塩化ビニル樹脂には、塩化ビニル単独重合体の他、塩素
化ポリ塩化ビニル、更には、塩化ビニル−酢酸ビニル共
重合体，塩化ビニル−エチレン−酢酸ビニル共重合体等
の塩化ビニル系共重合体、エチレン−酢酸ビニル共重合
体やエチレン−プロピレン共重合体等に塩化ビニル系を
グラフト重合させたグラフト共重合体等も含ませること
が可能である。上記メタクリル酸エステル系樹脂には、
ポリメチルメタクリレ−トまたはメチルメタクリレ−ト
とエチルアクリレ−トまたはアリリルニトリルとの共重
合体樹脂を用いることができる。上記充填剤には、炭酸
カルシウム、タルク、クレイ、アスベスト、シリカ等の
無機質粉末を使用できる。必要に応じ滑剤を添加するこ
ともでき、その滑剤としては、ポリエチレンワックス類
のような炭化水素類、ステアレリン酸またはステアリン
酸アミドのような脂肪酸または脂肪酸アミド、ブチルス
テアレ−トのような脂肪酸エステル類を挙げることがで
きる。その他、必要に応じ着色剤、難燃剤、酸化防止
剤、帯電防止剤等を添加することもできる。The recycled vinyl chloride resin and virgin vinyl chloride resin include, in addition to vinyl chloride homopolymer, chlorinated polyvinyl chloride, furthermore, vinyl chloride-vinyl acetate copolymer, vinyl chloride-ethylene-acetic acid. It is also possible to include a vinyl chloride-based copolymer such as a vinyl copolymer, a graft copolymer obtained by graft-polymerizing a vinyl chloride-based polymer to an ethylene-vinyl acetate copolymer, an ethylene-propylene copolymer, or the like. . In the methacrylate resin,
Polymethyl methacrylate or a copolymer resin of methyl methacrylate and ethyl acrylate or arylyl nitrile can be used. As the filler, inorganic powders such as calcium carbonate, talc, clay, asbestos, and silica can be used. If necessary, a lubricant may be added. Examples of the lubricant include hydrocarbons such as polyethylene waxes, fatty acids or fatty acid amides such as stearic acid or stearamide, and fatty acid esters such as butyl stearate. Can be mentioned. In addition, a coloring agent, a flame retardant, an antioxidant, an antistatic agent and the like can be added as needed.

【００２１】請求項８と９の発泡塩化ビニル樹脂管状体
の押出成形方法は、発泡性塩化ビニル樹脂組成物の発泡
倍率が変動しても、熱分解型発泡剤の供給量の調整によ
り肉厚の一様化を保証して寸法精度に優れた発泡塩化ビ
ニル樹脂管状体の製造を可能にするものである。図１
は、請求項８の発泡塩化ビニル樹脂管状体の押出成形方
法に使用する装置の一例を示している。図１において、
１は押出機であり、主材料用ホッパ−２１を定量フィダ
−２２によって、発泡剤用ホッパ−３１を定量フィダ−
３２によって、それぞれ押出機１のシリンダ−１０の後
端に連結してある。発泡剤用フィダ−３２は、押出機１
のシリンダ−熱の影響を回避するために、押出機１のシ
リンダ−１０に対し直角方向に向けて配設することが好
ましい。４は押出機１に取り付けた管状体成形用金型、
５は冷却水槽である。６は肉厚測定機であり、例えば、
ｘ線式、超音波反射式等を使用できる。７は引取り機、
８は定尺切断機、９は製品排出機である。上記装置を用
い、請求項８の方法により、発泡塩化ビニル樹脂管状体
を製造するには、リサイクル塩化ビニル樹脂を含む塩化
ビニル樹脂、熱分解型発泡剤、メタクリル酸エステル系
樹脂、充填剤及び滑剤を含有する発泡性塩化ビニル樹脂
組成物中の発泡剤を発泡剤用ホッパ−３１に投入し、発
泡以外の残余の材料（以下、主材料と称する）を主材料
用ホッパ−２１に投入し、これらを各フィダ−３２，２
２により押出機１に供給し、混練・溶融し、金型４内で
発泡させつつ賦型し、金型４からの発泡押出成形体を冷
却水槽５で冷却のうえ、引取り機７で引取り、切断機８
で定尺切断のうえ、排出機９で定尺管体を排出してい
く。The method of extrusion molding a foamed vinyl chloride resin tubular body according to claims 8 and 9 is characterized in that, even if the expansion ratio of the foamable vinyl chloride resin composition fluctuates, the thickness of the foamed vinyl chloride resin composition is controlled by adjusting the supply amount of the pyrolytic foaming agent. This makes it possible to manufacture a foamed polyvinyl chloride resin tubular body having excellent dimensional accuracy by ensuring uniformity of the tubular body. FIG.
Shows an example of an apparatus used in the extrusion molding method of the foamed vinyl chloride resin tubular body according to claim 8. In FIG.
Reference numeral 1 denotes an extruder, and a hopper 21 for the main material is fed to a quantitative feeder 22 and a hopper 31 for a foaming agent is fed to a quantitative feeder.
32 are connected to the rear end of the cylinder 10 of the extruder 1 respectively. The extruder 1 is used for the foaming agent feeder 32.
In order to avoid the influence of heat of the cylinder, it is preferable to dispose the extruder 1 in a direction perpendicular to the cylinder 10 of the extruder 1. 4 is a mold for forming a tubular body attached to the extruder 1,
5 is a cooling water tank. Reference numeral 6 denotes a thickness measuring machine, for example,
An x-ray type, an ultrasonic reflection type or the like can be used. 7 is a take-off machine,
Reference numeral 8 denotes a fixed-size cutting machine, and 9 denotes a product discharging machine. 9. A method for producing a foamed vinyl chloride resin tubular body by the method according to claim 8 using the above apparatus, wherein a vinyl chloride resin containing a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin, a filler and a lubricant are used. The foaming agent in the foamable vinyl chloride resin composition containing is supplied to the foaming agent hopper 31 and the remaining material other than foaming (hereinafter, referred to as main material) is supplied to the main material hopper 21, These are used for each Fida-32, 2
The mixture is supplied to the extruder 1 by kneading, kneading and melting, and shaping while foaming in the mold 4. The foamed extruded product from the mold 4 is cooled in the cooling water tank 5 and pulled by the take-off machine 7. Picking and cutting machine 8
Then, the fixed length pipe is discharged by the discharger 9 after the cutting.

【００２２】上記主材料中のリサイクル塩化ビニル樹脂
は、一般的規格、例えばＪＩＳＫ６７４１によって規制
されているが、安定剤の種類や量にバラツキがあり、既
述したように、通常の有機系熱分解型発泡剤では、発生
ガス量が一定せずに、上記管状体の肉厚変動が惹起され
る。而るに、本発明に係る押出成形方法では、成形体の
肉厚を肉厚測定機６で測定し、その測定肉厚値が基準値
よりも大きいときは、発泡剤供給フィダ−３２を減速し
発泡剤供給量を減少させることにより基準厚みに修正
し、測定肉厚値が基準値よりも小さいときは、発泡剤供
給フィダ−３２を増速し発泡剤供給量を増加させること
により基準厚みに修正して、肉厚の一様化を図ってい
る。The recycled vinyl chloride resin in the above-mentioned main material is regulated by general standards, for example, JIS K6741. However, there are variations in the types and amounts of the stabilizers. In the case of the mold blowing agent, the generated gas amount is not constant, and the thickness of the tubular body fluctuates. Thus, in the extrusion molding method according to the present invention, the thickness of the molded body is measured by the thickness measuring device 6, and when the measured thickness value is larger than the reference value, the blowing agent supply feeder 32 is decelerated. When the measured thickness value is smaller than the reference value, the blowing agent supply feeder 32 is accelerated to increase the blowing agent supply amount. To make the wall thickness uniform.

【００２３】上記の実施例では、金型４に、ストレ−ト
ヘッドダイを用いているが、管材通過孔を有するクロス
ヘッドダイを用い、管材上に発泡塩化ビニル樹脂体を被
覆成形することもできる。In the above embodiment, a straight head die is used for the mold 4, but a cross-head die having a tube passage hole may be used to coat and form a foamed vinyl chloride resin body on the tube.

【００２４】図２は、請求項９の発泡塩化ビニル樹脂管
状体の押出成形方法に使用する装置の一例を示してい
る。図２において、４０は三層管状体成形金型、１ａは
この金型の内側・外側流路に連結した非発泡樹脂押出機
である。１ｂは発泡塩化ビニル樹脂押出機であり、主材
用ホッパ−２１を定量フィダ−２２により発泡塩化ビニ
ル樹脂押出機１ｂのシリンダ−１０ｂの後端に連結し、
そのシリンダ−１０ｂに対し直角方向のフィダ−３２に
より発泡剤用ホッパ−３１をシリンダ−１ｂの後端に連
結して、発泡剤を押出機１ｂのシリンダ−熱の影響を受
けることなく押出機１ｂに供給可能としてある。５は冷
却水槽である。６は肉厚測定機であり、例えば、ｘ線
式、超音波反射式等を使用できる。７は引取り機、８は
定尺切断機、９は製品排出機である。FIG. 2 shows an example of an apparatus used in the method for extruding a foamed polyvinyl chloride resin tubular body according to claim 9. In FIG. 2, reference numeral 40 denotes a three-layer tubular body molding die, and reference numeral 1a denotes a non-foamed resin extruder connected to inner and outer flow paths of the die. 1b is a foamed vinyl chloride resin extruder, and the main material hopper-21 is connected to the rear end of the cylinder-10b of the foamed vinyl chloride resin extruder 1b by a quantitative feeder-22,
A blowing agent hopper 31 is connected to the rear end of the cylinder 1b by a feeder 32 perpendicular to the cylinder 10b, and the blowing agent is extruded without being affected by the heat of the cylinder of the extruder 1b. It can be supplied to 5 is a cooling water tank. Reference numeral 6 denotes a thickness measuring machine, for example, an x-ray type, an ultrasonic reflection type, or the like can be used. 7 is a take-off machine, 8 is a fixed-size cutting machine, and 9 is a product discharge machine.

【００２５】上記装置を用い、請求項９の方法により、
発泡塩化ビニル樹脂管状体を製造するには、リサイクル
塩化ビニル樹脂を含む塩化ビニル樹脂、熱分解型発泡
剤、メタクリル酸エステル系樹脂、充填剤及び滑剤を含
有する発泡性塩化ビニル樹脂組成物中の発泡剤を発泡剤
用ホッパ−３１に投入し、発泡以外の残余の材料（以
下、主材料と称する）を主材料用ホッパ−２１に投入
し、これらを各フィダ−３２，２２により押出機１ｂに
供給し、更に混練・溶融し、また、非発泡樹脂用ホッパ
−２１ａに非発泡性の通常の塩化ビニル樹脂組成物を投
入し、これをフィダ−２２ａにより非発泡樹脂押出機１
ａに供給し、更に混練・溶融し、これらの発泡性塩化ビ
ニル樹脂と非発泡性塩化ビニル樹脂を三層成形金型４０
から同時押出し、金型４０からの発泡押出成形体を冷却
水槽５で冷却のうえ、引取り機７で引取り、切断機８で
定尺切断のうえ、排出機９で定尺管体を排出していき、
この間、中間層の肉厚、または管状体全体の肉厚を肉厚
測定機６で測定し、その測定肉厚値が基準値よりも大き
いときは、発泡剤供給フィダ−３２を減速し発泡剤供給
量を減少させることにより基準厚みに修正し、測定肉厚
値が基準値よりも小さいときは、発泡剤供給フィダ−３
２を増速し発泡剤供給量を増加させることにより基準厚
みに修正して、中間層の肉厚、ひいては、三層管の肉厚
の一様化を図っている。According to the method of claim 9, using the above device,
To produce a foamed vinyl chloride resin tubular body, a foamable vinyl chloride resin composition containing a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin, a filler and a lubricant is used. The foaming agent is charged into the foaming agent hopper 31, the remaining material other than foaming (hereinafter referred to as the main material) is charged into the main material hopper 21, and these are extruded by the feeders 32 and 22 into the extruder 1b. , And further kneaded and melted, and a non-foamable ordinary vinyl chloride resin composition is charged into a non-foamable resin hopper 21a, which is fed to a non-foamable resin extruder 1 by a feeder 22a.
a, and further kneaded and melted, and these foaming vinyl chloride resin and non-foaming vinyl chloride resin
And the foamed extruded product from the mold 40 is cooled in the cooling water tank 5, taken up by the take-up machine 7, cut to a fixed length by the cutter 8, and discharged by the discharger 9 to the fixed-length tube. And then
During this time, the thickness of the intermediate layer or the thickness of the entire tubular body is measured by the thickness measuring device 6, and when the measured thickness value is larger than the reference value, the blowing agent supply feeder 32 is decelerated to reduce the blowing agent. When the measured thickness value is smaller than the reference value, the blowing agent supply feeder-3 is corrected.
By increasing the speed of 2 and increasing the supply amount of the foaming agent, the thickness is corrected to the reference thickness so as to make the thickness of the intermediate layer, and thus the thickness of the three-layer tube uniform.

【００２６】上記何れの実施例においても、肉厚修正
は、肉厚測定機６の測定値を肉厚基準値と比較し、その
差出力で発泡剤供給用フィダ−３２の速度制御を行う自
動制御方式により行うことができる。上記熱分解型発泡
剤の配合量は、０．１〜２重量％とされ、極めて小量で
あるから、フィダ−供給量の安定化のために、上記の発
泡性塩化ビニル樹脂組成物を、安定剤を含んでいないバ
−ジン塩化ビニル樹脂で希釈した発泡剤とそれ以外の材
料、または滑剤で希釈した発泡剤とそれ以外の材料に分
けて供給することもできる（メタクリル酸エステル系樹
脂や安定剤を同じフィダ−で供給することは、発泡倍率
に相当の影響を及ぼすので、不適切である）。In any of the above-described embodiments, the thickness correction is performed by comparing the measured value of the thickness measuring machine 6 with the reference value of the thickness, and controlling the speed of the foaming agent supply feeder 32 based on the difference output. It can be performed by a control method. The amount of the pyrolytic foaming agent is 0.1 to 2% by weight, which is an extremely small amount. Therefore, in order to stabilize the feeder supply amount, the foamable vinyl chloride resin composition is mixed with A foaming agent diluted with a virgin vinyl chloride resin containing no stabilizer and other materials, or a foaming agent diluted with a lubricant and other materials can be separately supplied (for example, a methacrylate resin or a methacrylate resin). Providing the stabilizer in the same feeder is inappropriate because it has a considerable effect on the expansion ratio).

【００２７】請求項８及び９において使用する発泡性塩
化ビニル樹脂組成物では、請求項１〜７に使用する組成
物とは異なり、熱分解型発泡剤に限定が課せられず、熱
分解型発泡剤に通常の有機系熱分解型発泡剤及び無機系
熱分解型発泡剤を使用できる。この点を除けば請求項１
〜７に使用する発泡性塩化ビニル樹脂組成物と実質的に
同じである。その有機系熱分解型発泡剤としては、
（１）アゾジカルボンアミド、アゾビスイソブチルニト
リル、Ｎ，Ｎ’−ジニトロソペンタメチレンテトラミ
ン、Ｎ，Ｎ’−ジメチル−Ｎ，Ｎ’−ジニトロソテレフ
タルアミド等のアゾ化合物、（２）ベンゾスルホニルヒ
ドラジド・Ｐ，Ｐ’−オキシビス（ベンゼンスルホニル
ヒドラジド）、トルエンスルホニルヒドラジドのような
スルホニルヒドラジド類を挙げることができ、無機系熱
分解型発泡剤としては、重炭酸ナトリウム、重炭酸アン
モニウム、炭酸アンモニウム等を挙げることができる。In the foamable vinyl chloride resin composition used in claims 8 and 9, unlike the compositions used in claims 1 to 7, there is no limitation to the pyrolytic foaming agent, As the agent, a conventional organic thermal decomposition type foaming agent and an inorganic thermal decomposition type foaming agent can be used. Claim 1 except for this point
To 7 are substantially the same as the foamable vinyl chloride resin compositions used. As the organic thermal decomposition type foaming agent,
(1) azo compounds such as azodicarbonamide, azobisisobutylnitrile, N, N'-dinitrosopentamethylenetetramine, N, N'-dimethyl-N, N'-dinitrosoterephthalamide, and (2) benzosulfonylhydrazide Sulfonyl hydrazides such as P, P'-oxybis (benzenesulfonyl hydrazide) and toluenesulfonyl hydrazide can be mentioned, and examples of inorganic pyrolytic foaming agents include sodium bicarbonate, ammonium bicarbonate, and ammonium carbonate. Can be mentioned.

【００２８】[0028]

【実施例】〔実施例１〕請求項１に対する実施例であ
り、発泡性塩化ビニル樹脂組成物の組成を、リサイクル
塩化ビニル樹脂５０重量部，バ−ジン塩化ビニル樹脂
（徳山積水工業社製重合度１０５０）５０重量部，無機
系熱分解型発泡剤としての重炭酸ナトリウム１．０重量
部，安定剤としての三塩基性硫酸鉛１．４重量部，加工
助剤としてのメタクリル酸エステル系樹脂（分子量３０
０万以上）５重量部，充填剤としての炭酸カルシウム１
０重量部，滑剤としてエステル系滑剤・ポリエチレンワ
ックス０．６重量部とし、リサイクル塩化ビニル樹脂に
は、ＪＩＳＫ６７４１硬質塩化ビニル樹脂の２ｍｍ×２
ｍｍメッシュ通過の粉砕物を使用した。この原料をホッ
トミキサ−で混合し、自己発熱で９０℃まで昇温させた
のち、ク−リングミキサ−で５０℃にまで冷却し、これ
を押出機で管状体に押出成形した。リサイクル塩化ビニ
ル樹脂が含有する安定剤に対する発泡の安定性を確認す
るために、安定剤として鉛系安定剤を使用した硬質塩化
ビニル樹脂をリサイクル塩化ビニル樹脂とした場合と、
安定剤として錫系安定剤を使用した硬質塩化ビニル樹脂
をリサイクル塩化ビニル樹脂とした場合のそれぞれの組
成物原料について、管状体を押出成形し、発泡倍率（発
泡剤を含まないときの比重／発泡剤を含むときの比重、
比重は水置換式比重計で測定）、独立気泡率（空気式比
重計及び水置換式比重計を使用して測定）等を測定し
た。EXAMPLE 1 Example 1 is an example corresponding to claim 1, in which the composition of the foamable vinyl chloride resin composition is obtained by mixing 50 parts by weight of recycled vinyl chloride resin and virgin vinyl chloride resin (polymerized by Tokuyama Sekisui Industry Co., Ltd.). 1050) 50 parts by weight, 1.0 part by weight of sodium bicarbonate as an inorganic thermal decomposition type foaming agent, 1.4 parts by weight of tribasic lead sulfate as a stabilizer, methacrylic acid ester resin as a processing aid (Molecular weight 30
50000 parts by weight, calcium carbonate 1 as filler
0 parts by weight, 0.6 parts by weight of an ester lubricant and polyethylene wax as a lubricant, and 2 mm × 2 JIS K6741 hard vinyl chloride resin as the recycled vinyl chloride resin.
The pulverized material having passed through a mesh of mm was used. The raw materials were mixed by a hot mixer, heated to 90 ° C. by self-heating, cooled to 50 ° C. by a cooling mixer, and extruded into a tubular body by an extruder. In order to confirm the stability of foaming with respect to the stabilizer contained in the recycled vinyl chloride resin, the case where the rigid vinyl chloride resin using a lead-based stabilizer as the recycled vinyl chloride resin is
For each composition raw material in the case where a rigid vinyl chloride resin using a tin-based stabilizer as a stabilizer is used as a recycled vinyl chloride resin, a tubular body is extruded, and an expansion ratio (specific gravity / foaming when no foaming agent is contained) is used. Specific gravity when containing the agent,
Specific gravity was measured with a water displacement type hydrometer, closed cell rate (measured using an air type hydrometer and a water displacement type hydrometer), and the like.

【００２９】〔比較例１〕実施例１に対し、無機系熱分
解型発泡剤としての重炭酸ナトリウム１．０重量部に代
え、有機系熱分解型発泡剤であるアゾジカルボンアミド
０．５重量部を使用した以外、実施例１と同様にして管
状体に押出成形した。更に、実施例１と同様にして、発
泡倍率、独立気泡率等を測定した。[Comparative Example 1] In comparison with Example 1, 1.0 part by weight of sodium bicarbonate as an inorganic thermal decomposition type foaming agent was replaced with 0.5 part by weight of azodicarbonamide as an organic thermal decomposition type foaming agent. Extrusion molding into a tubular body was performed in the same manner as in Example 1 except that the parts were used. Further, in the same manner as in Example 1, the expansion ratio, the closed cell ratio, and the like were measured.

【００３０】これら実施例１及び比較例１の発泡倍率、
独立気泡率等の測定結果は表１に示す通りであり、
（ ）はリサイクル塩化ビニル樹脂が錫系安定剤を含む
場合を、かっこ外は、リサイクル塩化ビニル樹脂が鉛系
安定剤を含む場合をそれぞれ示している。なお、成形体
の外観形状は何れの場合も良好であった。The expansion ratio of each of Example 1 and Comparative Example 1 was
The measurement results such as the closed cell rate are as shown in Table 1,
() Shows the case where the recycled vinyl chloride resin contains a tin-based stabilizer, and parentheses show the case where the recycled vinyl chloride resin contains a lead-based stabilizer. The appearance of the molded article was good in each case.

【表１】 実施例１ 比較例１ 熱分解型発泡剤の種類 無機系 有機系 発泡倍率（倍） ２．０（２．０） ２．０（１．６） 独立気泡率（％） ９１（９２） ９８（９８） この測定結果から、請求項１によれば、リサイクル塩化
ビニル樹脂中の安定剤に影響されることなく安定発泡を
保証でき、一様肉厚で、かつ独立気泡率が９０％以上の
発泡塩化ビニル樹脂管状体が得られることを確認でき
る。Table 1 Example 1 Comparative Example 1 Types of Thermal Decomposition Type Blowing Agents Inorganic Organic Blowing Ratio (times) 2.0 (2.0) 2.0 (1.6) Closed Cell Ratio (%) 91 ( 92) 98 (98) From the measurement results, according to claim 1, stable foaming can be ensured without being affected by the stabilizer in the recycled vinyl chloride resin, and the uniform thickness and the closed cell rate are 90%. % Or more can be confirmed to be obtained.

【００３１】〔実施例２〕請求項２を評価するための実
施例であり、実施例１に対し、リサイクル塩化ビニル樹
脂の粉砕径２．０ｍｍ×２．０ｍｍメッシュ通過を粉砕
径２．５ｍｍ×２．５ｍｍメッシュ通過に変えた以外、
実施例１に同じとした。実施例１に較べ独立気泡率がや
や低下し、リサイクル塩化ビニル樹脂の粉砕径を２．０
ｍｍ×２．０ｍｍメッシュ以下とする請求項２の技術的
意義を確認できた。[Embodiment 2] An embodiment for evaluating claim 2 is different from the embodiment 1 in that the recycled vinyl chloride resin is passed through a 2.0 mm × 2.0 mm mesh with a crushed diameter of 2.5 mm × Other than changing to 2.5mm mesh passage,
Same as Example 1. The closed cell rate was slightly lower than that of Example 1, and the recycled vinyl chloride resin had a pulverized diameter of 2.0.
The technical significance of the second aspect was confirmed to be not more than the mesh of 2.0 mm × 2.0 mm.

【００３２】〔実施例３〕請求項３を評価するための実
施例であり、実施例１に対し、加工助剤としてのメタク
リル酸エステル系樹脂の配合量１０重量部を、１．５重
量部，１５重量部，２５重量部に変えた以外、実施例１
に同じとした。その発泡倍率、独立気泡率等の測定結果
は表２に示す通りであり、１．５重量部では、リサイク
ル塩化ビニル樹脂の溶融粘度特性の差の吸収効果が不充
分となって発泡倍率が小さく、かつ両リサイクル塩化ビ
ニル樹脂に対する発泡倍率にやや差異が生じ、２５重量
部では、差が生じなくても、発泡倍率が低くなり、請求
項３におけるメタクリル酸エステル系樹脂２〜２０重量
部の技術的意義を確認できた。[Embodiment 3] This is an embodiment for evaluating claim 3, wherein 10 parts by weight of a methacrylate ester resin as a processing aid is added to 1.5 parts by weight of Example 1. Example 1 except that the weight was changed to 15 parts by weight and 25 parts by weight.
And the same. The measurement results of the expansion ratio, closed cell ratio, etc. are as shown in Table 2. At 1.5 parts by weight, the effect of absorbing the difference in the melt viscosity characteristics of the recycled vinyl chloride resin was insufficient, and the expansion ratio was small. The foaming ratio for both recycled vinyl chloride resins is slightly different from that for both recycled vinyl chloride resins. At 25 parts by weight, the foaming ratio is reduced even if there is no difference, and 2 to 20 parts by weight of the methacrylate resin according to claim 3 is used. Was confirmed.

【表２】 加工助剤量（重量部）１．５ １５ ２５ 発泡倍率（倍） １．４（１．３） １．９（１．９） １．４（１．４） 独立気泡率（％） ９７（９８） ９８（９９） １００（９９）Table 2 Amount of processing aid (parts by weight) 1.5 15 25 Expansion ratio (times) 1.4 (1.3) 1.9 (1.9) 1.4 (1.4) Closed cell rate ( %) 97 (98) 98 (99) 100 (99)

【００３３】〔実施例４〕請求項３を評価するための実
施例であり、実施例１に対し、充填剤量１０重量部を、
４重量部，１５重量部、２５重量部に変えた以外、実施
例１に同じとした。その発泡倍率、独立気泡率等の測定
結果は表３に示す通りであり、４重量部では、発泡倍率
及び独立気泡率がやや低くなり、２５重量部では発泡倍
率が低くなり、請求項３における充填剤５〜２０重量部
の技術的意義を確認できた。[Embodiment 4] This is an embodiment for evaluating claim 3, wherein 10 parts by weight of the filler is
Example 1 was the same as Example 1 except that the parts were changed to 4, 15 and 25 parts by weight. The measurement results of the expansion ratio, the closed cell ratio, and the like are as shown in Table 3. At 4 parts by weight, the expansion ratio and the closed cell ratio are slightly lower, and at 25 parts by weight, the expansion ratio is lower. The technical significance of 5 to 20 parts by weight of the filler was confirmed.

【表３】 充填剤量（重量部） ４ １５ ２５ 発泡倍率（倍） １．７（１．７） ２．０（２．０） １．４（１．４） 独立気泡率（％） ８３（８３） ９２（９２） ９３（９３）[Table 3] Amount of filler (parts by weight) 4 15 25 Expansion ratio (times) 1.7 (1.7) 2.0 (2.0) 1.4 (1.4) Closed cell rate (%) 83 (83) 92 (92) 93 (93)

【００３４】〔実施例５〕請求項４を評価するための実
施例であり、実施例１に対し、発泡剤量１．０重量部，
加工助剤量５重量部を発泡剤量１．２〜１．６重量部，
加工助剤量６〜８重量部に変えて発泡倍率を２から２．
２〜２．６と高くした以外、実施例１に同じとした。そ
の発泡倍率、独立気泡率等の測定結果は表４に示す通り
であり、実施例１との対比から、発泡倍率を２．０以上
にすると、独立気泡率が低くなり、請求項４における発
泡倍率２．０以下の技術的意義を確認できた。[Embodiment 5] This is an embodiment for evaluating claim 4, wherein the amount of the foaming agent is 1.0 part by weight,
5 parts by weight of a processing aid, 1.2 to 1.6 parts by weight of a foaming agent,
The foaming ratio was changed from 2 to 2. while changing the processing aid amount to 6 to 8 parts by weight.
The same as Example 1 except that the height was increased to 2 to 2.6. The measurement results of the expansion ratio, the closed cell ratio, and the like are as shown in Table 4. From the comparison with Example 1, when the expansion ratio was 2.0 or more, the closed cell ratio was reduced. The technical significance of a magnification of 2.0 or less was confirmed.

【表４】 発泡剤量（重量部） １．２ １．４ １．６ 加工助剤量（重量部）６ ７ ８ 発泡倍率（倍） ２．２（２．２） ２．４（２．４） ２．６（２．６） 独立気泡率（％） ８８（８８） ８０（８０） ６９（６９）Table 4 Amount of foaming agent (parts by weight) 1.2 1.4 1.6 Amount of processing aid (parts by weight) 6 7 8 Expansion ratio (times) 2.2 (2.2) 2.4 (2.4. 4) 2.6 (2.6) Closed cell rate (%) 88 (88) 80 (80) 69 (69)

【００３５】〔実施例６〕請求項５に対する実施例であ
り、発泡性塩化ビニル樹脂組成物の組成を、リサイクル
塩化ビニル樹脂５０重量部，バ−ジン塩化ビニル樹脂
（徳山積水工業社製重合度８００）５０重量部，有機系
熱分解型発泡剤として４，４’−オキシビス（ベンゼン
スルホニルホドラジド）（ＯＢＳＨ）１．８重量部，安
定剤としての三塩基性硫酸鉛１．４重量部，加工助剤と
してのメタクリル酸エステル系樹脂（分子量３００万以
上）１０重量部，充填剤としての炭酸カルシウム１０重
量部，滑剤としてエステル系滑剤・ポリエチレンワック
ス０．６重量部とし、リサイクル塩化ビニル樹脂には、
ＪＩＳＫ６７４１硬質塩化ビニル樹脂の２ｍｍ×２ｍｍ
メッシュ通過の粉砕物を使用した。この原料をホットミ
キサ−で混合し、自己発熱で１１０℃まで昇温させたの
ち、ク−リングミキサ−で５０℃にまで冷却し、これを
押出機で管状体に押出成形した。リサイクル塩化ビニル
樹脂が含有する安定剤に対する発泡の安定性を確認する
ために、安定剤として鉛系安定剤を使用した硬質塩化ビ
ニル樹脂をリサイクル塩化ビニル樹脂とした場合と、安
定剤として錫系安定剤を使用した硬質塩化ビニル樹脂を
リサイクル塩化ビニル樹脂とした場合のそれぞれの組成
物原料について、管状体を押出成形し、発泡倍率、独立
気泡率等を測定した。Example 6 This is an example corresponding to claim 5, wherein the composition of the foamable vinyl chloride resin composition is such that the recycled vinyl chloride resin is 50 parts by weight, and the virgin vinyl chloride resin (polymerization degree manufactured by Tokuyama Sekisui Industry Co., Ltd.) 800) 50 parts by weight, 1.8 parts by weight of 4,4'-oxybis (benzenesulfonyl hydrazide) (OBSH) as an organic pyrolytic foaming agent, 1.4 parts by weight of tribasic lead sulfate as a stabilizer Recycled vinyl chloride resin, 10 parts by weight of methacrylic acid ester resin (molecular weight of 3,000,000 or more) as processing aid, 10 parts by weight of calcium carbonate as filler, 0.6 parts by weight of ester lubricant and polyethylene wax as lubricant In
JISK6741 Hard vinyl chloride resin 2mm x 2mm
The crushed material that passed through the mesh was used. The raw materials were mixed by a hot mixer, heated to 110 ° C. by self-heating, cooled to 50 ° C. by a cooling mixer, and extruded into a tubular body by an extruder. In order to confirm the stability of foaming with respect to the stabilizer contained in the recycled vinyl chloride resin, a hard vinyl chloride resin using a lead-based stabilizer was used as the recycled vinyl chloride resin, and a tin-based stabilizer was used as the stabilizer. A tubular body was extruded from each of the composition raw materials when the hard vinyl chloride resin using the agent was converted to a recycled vinyl chloride resin, and the expansion ratio, closed cell ratio, and the like were measured.

【００３６】〔実施例７〕請求項５に対する実施例であ
り、実施例６に対し、有機系熱分解型発泡剤として４，
４’−オキシビス（ベンゼンスルホニルホドラジド）
（ＯＢＳＨ）１．８重量部をジニトロソペンタメチレン
テトラミン（ＤＰＴ）０．８重量部にした以外、実施例
６に同じとし、実施例６と同様にして管状体に押出成形
した。更に、実施例６と同様にして、発泡倍率、独立気
泡率等を測定した。Example 7 This is an example corresponding to the fifth aspect.
4'-oxybis (benzenesulfonyl hydrazide)
Except that 1.8 parts by weight of (OBSH) was changed to 0.8 parts by weight of dinitrosopentamethylenetetramine (DPT), the same procedure as in Example 6 was carried out, and extrusion was performed in the same manner as in Example 6. Further, in the same manner as in Example 6, the expansion ratio, closed cell ratio, and the like were measured.

【００３７】〔比較例２〕実施例６に対し、有機系熱分
解型発泡剤として４，４’−オキシビス（ベンゼンスル
ホニルホドラジド）（ＯＢＳＨ）１．８重量部をアゾジ
カルボンアミド（ＡＤＣＡ）０．９重量部にした以外、
実施例６に同じとし、実施例６と同様にして管状体に押
出成形した。更に、実施例６と同様にして、発泡倍率、
独立気泡率等を測定した。COMPARATIVE EXAMPLE 2 1.8 parts by weight of 4,4'-oxybis (benzenesulfonyl hydrazide) (OBSH) was added to azodicarbonamide (ADCA) as an organic pyrolysis type foaming agent. Except for 0.9 parts by weight,
It was the same as in Example 6, and was extruded into a tubular body in the same manner as in Example 6. Further, in the same manner as in Example 6, the expansion ratio,
The closed cell ratio and the like were measured.

【００３８】これら実施例６，７及び比較例２の発泡倍
率、独立気泡率等の測定結果は表５に示す通りであり、
（ ）はリサイクル塩化ビニル樹脂が錫系安定剤を含む
場合を、かっこ外は、リサイクル塩化ビニル樹脂が鉛系
安定剤を含む場合をそれぞれ示している。なお、成形体
の外観形状は何れの場合も良好であった。The results of measurement of the expansion ratio, closed cell ratio and the like of Examples 6 and 7 and Comparative Example 2 are as shown in Table 5.
() Shows the case where the recycled vinyl chloride resin contains a tin-based stabilizer, and parentheses show the case where the recycled vinyl chloride resin contains a lead-based stabilizer. The appearance of the molded article was good in each case.

【表５】 実施例６ 実施例７ 比較例２ 熱分解型発泡剤 ＯＢＳＨ ＤＰＴ ＡＤＣＡ 発泡倍率（倍） ３．０（３．０） ３．０（３．０） ３．０（２．６） 独立気泡率（％）９６（９８） ９７（９９） ９５（９６） この測定結果から、請求項５によれば、リサイクル塩化
ビニル樹脂中の安定剤に影響されることなく安定発泡を
保証でき、一様肉厚で、かつ独立気泡率が１００％に近
い発泡塩化ビニル樹脂管状体が得られることを確認で
き、請求項１に比べて独立気泡率を高くできる有利性も
ある。Table 6 Example 6 Example 7 Comparative Example 2 Pyrolytic foaming agent OBSH DPT ADCA Expansion ratio (times) 3.0 (3.0) 3.0 (3.0) 3.0 (2.6) Closed cell rate (%) 96 (98) 97 (99) 95 (96) From the measurement results, according to claim 5, stable foaming can be guaranteed without being affected by the stabilizer in the recycled vinyl chloride resin. It can be confirmed that a foamed vinyl chloride resin tubular body having a uniform thickness and a closed cell ratio close to 100% can be obtained, and there is also an advantage that the closed cell ratio can be increased as compared with the first aspect.

【００３９】〔実施例８〕請求項６を評価するための実
施例であり、実施例６に対し、リサイクル塩化ビニル樹
脂の粉砕径２．０ｍｍ×２．０ｍｍメッシュ通過を粉砕
径１．０ｍｍ×１．０ｍｍメッシュ通過及び粉砕径２．
５ｍｍ×２．５ｍｍメッシュ通過に変えた以外、実施例
６に同じとした。発泡倍率、独立気泡率等の測定結果は
表６に示す通りであり、２．５ｍｍ×２．５ｍｍメッシ
ュ通過のものでは、発泡倍率、独立気泡率共にやや低下
し、リサイクル塩化ビニル樹脂の粉砕径を２．０ｍｍ×
２．０ｍｍメッシュ以下とする請求項６の技術的意義を
確認できた。[Embodiment 8] An embodiment for evaluating claim 6 is different from the embodiment 6 in that the recycled vinyl chloride resin passes through a crushed diameter of 2.0 mm x 2.0 mm mesh and has a crushed diameter of 1.0 mm x 1. Pass through 1.0 mm mesh and crushed diameter
Example 6 was the same as Example 6 except that the mesh size was changed to 5 mm x 2.5 mm mesh. The measurement results of the expansion ratio, the closed cell ratio, etc. are as shown in Table 6. When the sample passed through a 2.5 mm × 2.5 mm mesh, both the expansion ratio and the closed cell ratio were slightly reduced, and the crushed diameter of the recycled vinyl chloride resin was reduced. Is 2.0mm ×
The technical significance of claim 6 in which the mesh size is 2.0 mm or less was confirmed.

【表６】 リサイクル塩ビの粉砕径 １ｍｍ×１ｍｍ以下 ２．５ｍｍ×２．５ｍｍ以下 発泡倍率（倍） ３．０（３．０） ２．５（２．５） 独立気泡率（％） ９７（９７） ９１（９１）[Table 6] Crushed diameter of recycled PVC 1 mm x 1 mm or less 2.5 mm x 2.5 mm or less Expansion ratio (times) 3.0 (3.0) 2.5 (2.5) Closed cell ratio (%) 97 ( 97) 91 (91)

【００４０】〔実施例９〕請求項７を評価するための実
施例であり、実施例６に対し、有機系熱分解型発泡剤と
しての４，４’−オキシビス（ベンゼンスルホニルホド
ラジド）を１．８重量部から０．９重量部に減じ、かつ
加工助剤としてのメタクリル酸エステル系樹脂の配合量
１０重量部を、１．５重量部，１５重量部，２５重量部
に変えた以外、実施例６に同じとした。その発泡倍率、
独立気泡率等の測定結果は表７に示す通りであり、１．
５重量部では、リサイクル塩化ビニル樹脂の溶融粘度特
性の差の吸収効果が不充分となって、発泡倍率が小さ
く、かつ両リサイクル塩化ビニル樹脂に対する発泡倍率
にやや差異が生じ、２５重量部では、差が生じなくて
も、発泡倍率が低くなり、請求項７におけるメタクリル
酸エステル系樹脂２〜２０重量部の技術的意義を確認で
きた。[Embodiment 9] An embodiment for evaluating claim 7 is different from the embodiment 6 in that 4,4'-oxybis (benzenesulfonyl hydrazide) as an organic thermal decomposition type foaming agent is used. Except that the amount was reduced from 1.8 parts by weight to 0.9 parts by weight and the blending amount of methacrylic acid ester resin as a processing aid was changed from 10 parts by weight to 1.5 parts by weight, 15 parts by weight, and 25 parts by weight. The same as in Example 6. Its expansion ratio,
The measurement results of the closed cell ratio and the like are as shown in Table 7;
At 5 parts by weight, the effect of absorbing the difference in the melt viscosity properties of the recycled vinyl chloride resin is insufficient, the expansion ratio is small, and the expansion ratio for both recycled vinyl chloride resins is slightly different. At 25 parts by weight, Even if there was no difference, the expansion ratio was low, and the technical significance of 2 to 20 parts by weight of the methacrylate resin in claim 7 could be confirmed.

【表７】 加工助剤量（重量部）１．５ １５ ２５ 発泡倍率（倍） ２．０（１．８） １．９（１．９） １．５（１．５） 独立気泡率（％） ９６（９８） ９８（９９） ９９（１００）Table 7 Amount of processing aid (parts by weight) 1.5 15 25 Expansion ratio (times) 2.0 (1.8) 1.9 (1.9) 1.5 (1.5) Closed cell rate ( %) 96 (98) 98 (99) 99 (100)

【００４１】〔実施例１０〕請求項７を評価するための
実施例であり、実施例６に対し、充填剤量１０重量部
を、４重量部，２５重量部に変えた以外、実施例６に同
じとした。その発泡倍率、独立気泡率等の測定したとこ
ろ、表８の通りであり、４重量部では、発泡倍率及び独
立気泡率がやや低くなり、２５重量部では発泡倍率が低
くなり、請求項７における充填剤５〜２０重量部の技術
的意義を確認できた。[Embodiment 10] This is an embodiment for evaluating claim 7, except that the amount of filler is changed from 10 parts by weight to 4 parts by weight and 25 parts by weight with respect to Example 6. And the same. The expansion ratio, the closed cell ratio and the like were measured, and the results are as shown in Table 8. At 4 parts by weight, the expansion ratio and the closed cell ratio were slightly lower, and at 25 parts by weight, the expansion ratio was lower. The technical significance of 5 to 20 parts by weight of the filler was confirmed.

【表８】 充填剤量（重量部） ４ ２５ 発泡倍率（倍） ２．３（２．３） ２．４（２．４） 独立気泡率（％） ８５（８５） ９８（９８）[Table 8] Filler amount (parts by weight) 4 25 Expansion ratio (times) 2.3 (2.3) 2.4 (2.4) Closed cell ratio (%) 85 (85) 98 (98)

【００４２】[0042]

【発明の効果】本発明の請求項１〜４の発泡塩化ビニル
樹脂管状体の押出成形方法によれば、リサイクル塩化ビ
ニル樹脂中の安定剤の影響をよく排除して発泡倍率をほ
ぼ一定にできるから、塩化ビニル樹脂にリサイクル塩化
ビニル樹脂を使用するにもかかわらず、一様肉厚の発泡
塩化ビニル樹脂管状体を押出成形できる。特に、請求項
２では、発泡剤を均一分散できるために、請求項３では
リサイクル塩化ビニル樹脂の組成の不定性に起因する溶
融粘度特性の変動を効果的に吸収できるために、発泡倍
率及び独立気泡率を高上でき、請求項４では発泡倍率の
調整により独立気泡率を高くでき、より一層に良好な発
泡塩化ビニル樹脂管状体の押出成形が可能となる。According to the extrusion molding method of the expanded vinyl chloride resin tubular body of the present invention, the influence of the stabilizer in the recycled vinyl chloride resin can be eliminated well and the expansion ratio can be made substantially constant. Therefore, a foamed vinyl chloride resin tubular body having a uniform thickness can be extruded despite the use of recycled vinyl chloride resin as the vinyl chloride resin. In particular, in claim 2, since the foaming agent can be uniformly dispersed, and in claim 3, since the fluctuation of the melt viscosity characteristic caused by the indefiniteness of the composition of the recycled vinyl chloride resin can be effectively absorbed, the expansion ratio and the independent In the fourth aspect, the closed cell rate can be increased by adjusting the expansion ratio, and a more favorable extrusion molding of a foamed vinyl chloride resin tubular body can be achieved.

【００４３】また、請求項５の発泡塩化ビニル樹脂管状
体の押出成形方法によれば、リサイクル塩化ビニル樹脂
中の安定剤の影響をよく排除して発泡倍率をほぼ一定に
でき、しかも、熱分解型発泡剤として無機系に較べ分解
速度の速い有機系を使用しているから、無機系に較べ高
発泡倍率にでき、その結果、塩化ビニル樹脂にリサイク
ル塩化ビニル樹脂を使用するにもかかわらず、一様肉厚
の高発泡塩化ビニル樹脂管状体を押出成形できる。特
に、請求項６では、発泡剤を均一分散できることによ
り、請求項７ではリサイクル塩化ビニル樹脂の組成の不
定性に起因する溶融粘度特性の変動を効果的に吸収でき
ることにより、発泡倍率及び独立気泡率を高上でき、よ
り一層に良好な高発泡塩化ビニル樹脂管状体の押出成形
が可能となる。Further, according to the method for extruding a tubular polyvinyl chloride resin body according to the fifth aspect, the expansion ratio can be made substantially constant by eliminating the influence of the stabilizer in the recycled vinyl chloride resin, and the thermal decomposition can be achieved. As an organic foaming agent is used as a foaming agent, which has a higher decomposition rate than inorganic ones, it can have a higher expansion ratio than inorganic ones.As a result, despite the use of recycled vinyl chloride resin for vinyl chloride resin, A highly foamed vinyl chloride resin tubular body having a uniform thickness can be extruded. In particular, in claim 6, the foaming agent can be uniformly dispersed, and in claim 7, it is possible to effectively absorb the change in the melt viscosity characteristic caused by the indefiniteness of the composition of the recycled vinyl chloride resin. , And it is possible to extrude a more excellent tubular foamed vinyl chloride resin body.

【００４４】更に、請求項８，９の発泡塩化ビニル樹脂
管状体の押出成形方法によれば、リサイクル塩化ビニル
樹脂中の安定剤の不定性に起因する発泡倍率の変動下、
熱分解型発泡剤のフィ−ド量の調整により肉厚を一様化
しており、引取り機の調整によらずに、容易に肉厚一様
の発泡塩化ビニル樹脂管状体の押出成形を行うことがで
き、特に、請求項９では、中間層を発泡塩化ビニル樹脂
とした三層とし、熱分解型発泡剤のフィ−ド量の調整に
よりその中間層の肉厚を一様化しており、中間層厚みが
薄く、肉厚変動の絶対量が小さく、それだけ変動に対す
るフィ−ド量の調整が容易である有利性もある。Further, according to the method for extruding a tubular polyvinyl chloride resin body according to the eighth and ninth aspects of the present invention, it is possible to reduce the expansion ratio due to the instability of the stabilizer in the recycled vinyl chloride resin.
The thickness is made uniform by adjusting the feed amount of the thermal decomposition type foaming agent, and the extrusion molding of the foamed vinyl chloride resin tubular body having a uniform thickness can be easily performed without adjusting the take-off machine. In particular, in claim 9, the intermediate layer is made of three layers made of a foamed vinyl chloride resin, and the thickness of the intermediate layer is made uniform by adjusting the feed amount of the pyrolytic foaming agent. There is also an advantage that the thickness of the intermediate layer is thin and the absolute amount of the thickness variation is small, and the feed amount can be easily adjusted for the variation.

【図面の簡単な説明】[Brief description of the drawings]

【図１】請求項８の発泡塩化ビニル樹脂管状体の押出成
形方法に使用する装置の一例を示している。FIG. 1 shows an example of an apparatus used for a method for extrusion-molding a foamed vinyl chloride resin tubular body according to claim 8.

【図２】請求項９の発泡塩化ビニル樹脂管状体の押出成
形方法に使用する装置の一例を示している。FIG. 2 shows an example of an apparatus used in the method for extruding a foamed polyvinyl chloride resin tubular body according to claim 9;

【符号の説明】[Explanation of symbols]

１ 押出機 ２１ 発泡主材料用ホッパ− ２２ 発泡主材料供給フィダ− ３１ 発泡剤用ホッパ− ３２ 発泡剤供給フィダ− ４ 金型 １ａ 非発泡樹脂押出機 １ｂ 発泡樹脂押出機 ４０ 三層用金型 Reference Signs List 1 extruder 21 foaming main material hopper 22 foaming main material supply feeder 31 foaming agent hopper 32 foaming agent supply feeder 4 mold 1a non-foamed resin extruder 1b foamed resin extruder 40 three-layer mold

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ３２Ｂ 31/30 Ｂ３２Ｂ 31/30 Ｃ０８Ｊ 9/10 ＺＡＢ Ｃ０８Ｊ 9/10 ＺＡＢ Ｃ０８Ｋ 3/00 Ｃ０８Ｋ 3/00 Ｃ０８Ｌ 27/06 Ｃ０８Ｌ 27/06 //(Ｃ０８Ｌ 27/06 (Ｃ０８Ｌ 27/06 33:10） 33:10） Ｂ２９Ｋ 27:06 Ｂ２９Ｋ 27:06 105:04 105:04 105:16 105:16 105:26 105:26 Ｂ２９Ｌ 9:00 Ｂ２９Ｌ 9:00 23:00 23:00 Ｆターム(参考） 4F074 AA35A AA36A AA48A AC26 AC32 BA03 BA04 BA13 BA14 BA16 BA17 BA18 CA22 CC04Y CC22X CC22Y DA02 4F100 AA07H AA08H AH01H AH03H AK01B AK01C AK15A AK25A BA03 BA10B BA10C CA01A CA05 CA19 CA23A DA11 DJ01A JL16A 4F207 AA15 AA21 AA50 AB02 AB11 AC01 AR12 AR14 AR20 KA01 KA11 KB26 KF01 KF02 KF04 KK04 KL62 4J002 BD041 BD051 BG052 DE236 DJ016 DJ026 DJ036 DJ046 FD016 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification code FI Theme coat ゛ (Reference) B32B 31/30 B32B 31/30 C08J 9/10 ZAB C08J 9/10 ZAB C08K 3/00 C08K 3/00 C08L 27/06 C08L 27/06 // (C08L 27/06 (C08L 27/06 33:10) 33:10) B29K 27:06 B29K 27:06 105: 04 105: 04 105: 16 105: 16 105: 26 105: 26 B29L 9:00 B29L 9:00 23:00 23:00 F term (reference) 4F074 AA35A AA36A AA48A AC26 AC32 BA03 BA04 BA13 BA14 BA16 BA17 BA18 CA22 CC04Y CC22X CC22Y DA02 4F100 AA07H AA08H AH01H AH03 AK01AAK15B BA10B BA10C CA01A CA05 CA19 CA23A DA11 DJ01A JL16A 4F207 AA15 AA21 AA50 AB02 AB11 AC01 AR12 AR14 AR20 KA01 KA11 KB26 KF01 KF02 KF04 KK04 KL62 4J002 BD041 BD051 BG052 DE236 DJ016 DJ026 DJ016 DJ046

Claims (9)

【特許請求の範囲】[Claims] 【請求項１】塩化ビニル樹脂、熱分解型発泡剤、メタク
リル酸エステル系樹脂及び充填剤を含有する組成物から
管状体を押出成形する方法であり、塩化ビニル樹脂の少
なくとも一部にリサイクル塩化ビニル樹脂を使用し、熱
分解型発泡剤に無機系熱分解型発泡剤のみを使用するこ
とを特徴とする発泡塩化ビニル樹脂管状体の押出成形方
法。1. A method of extruding a tubular body from a composition containing a vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin and a filler, wherein at least a part of the vinyl chloride resin is recycled vinyl chloride. A method for extruding a foamed vinyl chloride resin tubular body, comprising using a resin and using only an inorganic thermal decomposition type foaming agent as a thermal decomposition type foaming agent. 【請求項２】リサイクル塩化ビニル樹脂に粒径２ｍｍ以
下の粉砕粒体を使用する請求項１記載の発泡塩化ビニル
樹脂管状体の押出成形方法。2. The method for extruding a foamed vinyl chloride resin tubular body according to claim 1, wherein the recycled vinyl chloride resin is used as ground particles having a particle size of 2 mm or less. 【請求項３】塩化ビニル樹脂１００重量部に対し、メタ
クリル酸エステル系樹脂を２〜２０重量部、充填剤を５
〜２０重量部とする請求項１または２記載の発泡塩化ビ
ニル樹脂管状体の押出成形方法。3. A methacrylate resin is used in an amount of 2 to 20 parts by weight and a filler is used in an amount of 5 to 100 parts by weight of a vinyl chloride resin.
The extrusion molding method of a foamed polyvinyl chloride resin tubular body according to claim 1 or 2, wherein the amount is from 20 to 20 parts by weight. 【請求項４】押出成形体の発泡倍率を２倍以下とする請
求項１〜３何れか記載の発泡塩化ビニル樹脂管状体の押
出成形方法。4. The method for extruding a tubular polyvinyl chloride resin article according to claim 1, wherein the expansion ratio of the extruded article is 2 times or less. 【請求項５】塩化ビニル樹脂、熱分解型発泡剤、メタク
リル酸エステル系樹脂及び充填剤を含有する組成物から
管状体を押出成形する方法であり、塩化ビニル樹脂の少
なくとも一部にリサイクル塩化ビニル樹脂を使用し、熱
分解型発泡剤に４，４’−オキシビス（ベンゼンスルホ
ニルホドラジド）またはジニトロソペンタメチレンテト
ラミンを使用することを特徴とする発泡塩化ビニル樹脂
管状体の押出成形方法。5. A method for extruding a tubular body from a composition containing a vinyl chloride resin, a pyrolytic foaming agent, a methacrylate resin and a filler, wherein at least a part of the vinyl chloride resin is recycled vinyl chloride. A method for extruding a foamed vinyl chloride resin tubular body, wherein a resin is used and 4,4'-oxybis (benzenesulfonyl hydrazide) or dinitrosopentamethylenetetramine is used as a pyrolytic foaming agent. 【請求項６】リサイクル塩化ビニル樹脂に粒径２ｍｍ以
下の粉砕粒体を使用する請求項５記載の発泡塩化ビニル
樹脂管状体の押出成形方法。6. A method for extruding a foamed vinyl chloride resin tubular body according to claim 5, wherein ground particles having a particle size of 2 mm or less are used as the recycled vinyl chloride resin. 【請求項７】塩化ビニル樹脂１００重量部に対し、メタ
クリル酸エステル系樹脂を２〜２０重量部、充填剤を５
〜２０重量部とする請求項５または６記載の発泡塩化ビ
ニル樹脂管状体の押出成形方法。7. A methacrylic acid ester resin is used in an amount of 2 to 20 parts by weight and a filler is used in an amount of 5 to 100 parts by weight of a vinyl chloride resin.
The extrusion molding method of a foamed vinyl chloride resin tubular body according to claim 5 or 6, wherein the amount is from 20 to 20 parts by weight. 【請求項８】リサイクル塩化ビニル樹脂を含む塩化ビニ
ル樹脂、熱分解型発泡剤、メタクリル酸エステル系樹脂
及び充填剤を含有する組成物を管状体に押出成形し、発
泡塩化ビニル樹脂管状体の肉厚変動に応じ上記熱分解型
発泡剤の押出機への供給量を調節することによってその
肉厚を調整することを特徴とする発泡塩化ビニル樹脂管
状体の押出成形方法。8. A composition comprising a vinyl chloride resin containing a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylic ester resin and a filler, is extruded into a tubular body, and the meat of the foamed vinyl chloride resin body is extruded. An extrusion molding method for a foamed vinyl chloride resin tubular body, characterized in that the thickness is adjusted by adjusting the supply amount of the pyrolytic foaming agent to an extruder according to the thickness variation. 【請求項９】三層押出しで、しかも、中間層を、リサイ
クル塩化ビニル樹脂を含む塩化ビニル樹脂、熱分解型発
泡剤、メタクリル酸エステル系樹脂及び充填剤を含有す
る組成物の発泡体にして三層管状体を押出成形し、発泡
中間層の肉厚変動に応じ上記熱分解型発泡剤の押出機へ
の供給量を調節することによってその発泡中間層肉厚を
調整することを特徴とする発泡塩化ビニル樹脂管状体の
押出成形方法。9. A three-layer extrusion, wherein the intermediate layer is a foam of a composition containing a vinyl chloride resin containing a recycled vinyl chloride resin, a pyrolytic foaming agent, a methacrylic ester resin and a filler. The three-layer tubular body is extrusion molded, and the thickness of the foamed intermediate layer is adjusted by adjusting the supply amount of the pyrolytic foaming agent to the extruder according to the thickness variation of the foamed intermediate layer. An extrusion molding method for a foamed vinyl chloride resin tubular body.
JP2000194542A 2000-06-28 2000-06-28 Method for extrusion molding of foamed vinyl chloride resin tubular material Pending JP2002012691A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103739983A (en) * 2013-12-09 2014-04-23 吴江市董鑫塑料包装厂 Extruded low-foaminess PVC section bar
JP2017155868A (en) * 2016-03-02 2017-09-07 積水化学工業株式会社 Foam pipe joint
JP2017155869A (en) * 2016-03-02 2017-09-07 積水化学工業株式会社 Foam pipe joint
JP2017159468A (en) * 2016-03-07 2017-09-14 株式会社エクセルシャノン Manufacturing method of resin sash
CN110551348A (en) * 2019-10-10 2019-12-10 成都天英环保科技有限公司 PVC foam material preparation method based on PVC waste recycling
CN114174412A (en) * 2019-07-31 2022-03-11 韩华思路信(株) Foamable vinyl chloride resin composition

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103739983A (en) * 2013-12-09 2014-04-23 吴江市董鑫塑料包装厂 Extruded low-foaminess PVC section bar
JP2017155868A (en) * 2016-03-02 2017-09-07 積水化学工業株式会社 Foam pipe joint
JP2017155869A (en) * 2016-03-02 2017-09-07 積水化学工業株式会社 Foam pipe joint
JP2017159468A (en) * 2016-03-07 2017-09-14 株式会社エクセルシャノン Manufacturing method of resin sash
CN114174412A (en) * 2019-07-31 2022-03-11 韩华思路信(株) Foamable vinyl chloride resin composition
CN110551348A (en) * 2019-10-10 2019-12-10 成都天英环保科技有限公司 PVC foam material preparation method based on PVC waste recycling

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