JP4439750B2 - Chlorinated vinyl chloride resin tube - Google Patents
Chlorinated vinyl chloride resin tube Download PDFInfo
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- JP4439750B2 JP4439750B2 JP2001038584A JP2001038584A JP4439750B2 JP 4439750 B2 JP4439750 B2 JP 4439750B2 JP 2001038584 A JP2001038584 A JP 2001038584A JP 2001038584 A JP2001038584 A JP 2001038584A JP 4439750 B2 JP4439750 B2 JP 4439750B2
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- vinyl chloride
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Description
【０００１】
【発明の属する技術分野】
本発明は塩素化塩化ビニル系樹脂管に関する。
【０００２】
【従来の技術】
従来より、塩化ビニル系樹脂は機械的強度、耐薬品性、耐油性等の優れた特性を活かして、例えば、建材用、水道用、農業用、工業用の管や継手、平板等に広く使用されている。
【０００３】
また、塩化ビニル系樹脂を塩素化して得られる、耐熱性を向上させた塩素化塩化ビニル系樹脂を用いた成形物は、給湯管、工業用配管材、工業用板等の従来の塩化ビニル系樹脂成形物では使用できなかった用途にも使用されて来ている。
【０００４】
しかしながら、上記塩素化塩化ビニル系樹脂を用いて成形した管は、耐衝撃性及びクラック伝搬性が十分でないという問題点があった。
そこで、例えば、特開平１０−２９６８２１号公報において、耐衝撃性を向上させる方法が提案されているが、この方法では、この管を延伸成形しようとすると均一な成形が困難であるという問題点があった。
【０００５】
【発明が解決しようとする課題】
本発明は、上記問題点を解決するために、均一な成形が可能な塩素化塩化ビニル系樹脂管を提供することを目的とする。
【０００６】
【課題を解決するための手段】
請求項１記載の発明（以下、発明１という）による塩素化塩化ビニル系樹脂管は、下記塩素化塩化ビニル系樹脂組成物（ａ）を成形して得られる樹脂管を、１２０〜１７０℃で管周方向及び管軸方向の少なくともいずれかの一方向に延伸し、その延伸した方向の延伸倍率が１．３〜１０倍であることを特徴とする。
塩素化塩化ビニル系樹脂組成物（ａ）
塩素含有量が６０〜７１重量％である塩素化塩化ビニル系樹脂と、アクリロニトリル−ブタジエン共重合体（ＮＢＲ）またはエチレン−酢酸ビニル−一酸化炭素共重合体（ＥＶＡＣＯ）である熱可塑性エラストマーと、からなる塩素化塩化ビニル系樹脂組成物を、ＪＩＳ Ｋ ７１６２に準拠し、平均幅ｗ0の試験片を作成し、所定の温度、所定の延伸倍率に達するまで延伸させた後、
Δｗ＝（標線間での最大幅）―（標線間での最小幅）
ａ＝（延伸後の標線間距離）／（延伸前の標線間距離）とした場合のΔｗ／（ｗ0／ａ1/2）が０．１以下となる塩素化塩化ビニル樹脂組成物。
【０００７】
請求項２記載の発明（以下、発明２という）による塩素化塩化ビニル系樹脂管は、上記
発明１の塩素化塩化ビニル系樹脂組成物が、塩素含有量が６０〜７１重量％である塩素化塩化ビニル系樹脂１００重量部と、アクリロニトリル−ブタジエン共重合体（ＮＢＲ）またはエチレン−酢酸ビニル−一酸化炭素共重合体（ＥＶＡＣＯ）である熱可塑性エラストマー０．０１〜２０重量部と、からなることを特徴とする。
以下、本発明の構成について詳述する。
【０００９】
本発明において、塩素化塩化ビニル系樹脂の塩素含有量は６０〜７１重量％であり、好ましくは６２〜６８重量％である。塩素含有量が６０重量％未満では、十分な耐熱性が得られず、逆に、塩素含有量が７１重量％を超えると、樹脂管の成形が困難になる。尚、上記塩素含有量は、ＪＩＳ Ｋ ７２２９に準拠した酸素フラスコ燃焼法による中和適定により求められる。
【００１０】
上記塩素化塩化ビニル系樹脂は塩化ビニル系樹脂を塩素化して製造されるが、この塩素化の方法としては特に限定されず、従来から公知の水懸濁方法や溶液塩素化方法等が挙げられ、一般に工業的には水懸濁方法が好ましい。
【００１１】
上記塩素含有量を本発明の範囲に調整する方法としては、塩素化反応段階で調整してもよいし、高塩素含有量の塩化ビニル系樹脂と低塩素含有量の塩化ビニル系樹脂とをブレンドして調整してもよい。
【００１２】
また、上記塩化ビニル系樹脂としては特に限定されず、塩化ビニル単独重合体、塩化ビニルモノマーと共重合可能な不飽和結合を有する共重合モノマーとの共重合体、又は塩化ビニルモノマーをグラフト共重合したグラフト共重合体等が挙げられ、これらは単独もしくは２種以上が併用されてもよい。
【００１３】
上記塩化ビニルモノマーと共重合可能な不飽和結合を有する共重合モノマーとしては特に限定されず、例えば、エチレン、プロピレン、ブチレン等のα−オレフィン類；酢酸ビニル、プロピオン酸ビニル等のビニルエステル類；ブチルビニルエーテル,セチルビニルエーテル等のビニルエーテル類；メチル（メタ）アクリレート、エチル（メタ）アクリレート、ブチルアクリレート、フェニルメタクリレート等の（メタ）アクリル酸エステル類；スチレン、α−メチルスチレン等の芳香族ビニル類；塩化ビニリデン、フッ化ビニリデン等のハロゲン化ビニル類；Ｎ−フェニルマレイミド、Ｎ−シクロヘキシルマレイミド等のＮ−置換マレイミド類等が挙げられ、これらは単独もしくは２種以上が併用されてもよい。
【００１４】
また、上記塩化ビニルモノマーをグラフト共重合したグラフト共重合体としては特に限定されず、例えば、エチレン−酢酸ビニル共重合体；エチレン−酢酸ビニル−一酸化炭素共重合体；エチレン−エチルアクリレート共重合体；エチレン−ブチルアクリレート−一酸化炭素共重合体；エチレン−メチルメタアクリレート共重合体；エチレン−プロピレン共重合体；アクリロニトリル−ブタジエン共重合体；ポリウレタン；塩素化ポリエチレン；塩素化ポリプロピレン等のグラフト共重合体が挙げられ、これらは単独もしくは２種以上が併用されてもよい。
【００１５】
本発明に用いられる熱可塑性エラストマーとしては、アクリロニトリル−ブタジエン共重合体（ＮＢＲ）または、エチレン−酢酸ビニル−一酸化炭素共重合体（ＥＶＡＣＯ）であり、これらは単独もしくは併用されてもよい。
【００１６】
発明２による塩素化塩化ビニル系樹脂組成物においては、上記熱可塑性エラストマーの添加量は、上記塩素化塩化ビニル系樹脂１００重量部に対して０．０１〜２０重量部である。添加量が０．０１重量部未満では、得られる樹脂管の均一な延伸が困難となり、逆に、２０重量部を超えると、得られる樹脂管の耐熱性や強度が低下することがある。
【００１７】
本発明に用いられる塩素化塩化ビニル系樹脂組成物には、必要に応じて、塩化ビニル系樹脂；アルキル錫メルカプト化合物やアルキル錫マレート等の熱安定剤；ポリエチレン系ワックス、エステル系ワックス、ステアリン酸、モンタン酸系ワックス、カルシウムステアレート等の滑剤；アクリル系強化剤、塩素化ポリエチレン系強化剤等の強化剤；顔料；帯電防止剤；難燃剤；炭酸カルシウム、タルク、クレー、マイカ等の無機充填剤；メタクリル酸エステル系樹脂等の加工助剤などの配合剤が添加されてもよい。また、これらの配合剤は、従来公知の方法により、均一に混合して用いられる。
【００１８】
本発明に用いる塩素化塩化ビニル系樹脂組成物は、延伸倍率をａ、延伸前の平均幅をｗ0、延伸後の幅のばらつきをΔｗとした場合に、Δｗ／（ｗ0／ａ1/2）が０．１以下でなくてはならない。この値が０．１を超えると均一な延伸が困難となる。
【００１９】
上記Δｗ／（ｗ0／ａ1/2）の評価方法を、以下に示す。
＜評価方法＞
１）塩素化塩化ビニル系樹脂組成物を、ロール成形機等の適切な成形機を用いて混練した後、プレス成形機を使用して、厚さ３ｍｍの板を作成する。
２）ＪＩＳ Ｋ ７１６２に準拠し、１）で得られた板より、１Ｂ型試験片を機械加工により作成する。
３）ＪＩＳ Ｋ ７１６２の標線間（５ｃｍ）での試験片の幅を測定し、平均幅ｗ0を算出する。
４）延伸温度に保持された恒温室内において、上記試験片の十分な状態調節を行った後、延伸温度雰囲気中でＪＩＳ Ｋ ７１６２に準拠し、所定の延伸倍率に達するまで延伸させた後、試験片を室温まで冷却する。
５）恒温室から取り出した試験片の標線間での幅を測定して、Δｗ／（ｗ0／ａ1/2）を算出する。ここで、幅のばらつきΔｗ、及び延伸倍率ａは、以下の式で表される。
Δｗ＝（標線間での最大幅）―（標線間での最小幅）
ａ＝（延伸後の標線間距離）／（延伸前の標線間距離）
【００２０】
本発明においては、上記方法で得られる塩素化塩化ビニル系樹脂組成物を、例えば、単軸押出機や２軸押出機を用いた公知の押出方法で樹脂管に成形される。
【００２１】
本発明による塩素化塩化ビニル系樹脂管は、上記の塩素化塩化ビニル系樹脂組成物を成形して得られる樹脂管を、１２０〜１７０℃で、管周方向及び管軸方向の少なくともいずれかの一方向に延伸し、その延伸した方向の延伸倍率が１．３〜１０倍である。
【００２２】
上記延伸方法は特には限定されないが、例えば、延伸温度に加熱した原管を延伸金型により周・軸方向に延伸成形する方法、空気や液体により原管を延伸温度に加熱し、加圧する事により周・軸方向に延伸成形する方法、延伸温度でビレットを固体押出する事で延伸する方法等が挙げられる。
【００２３】
また、上記延伸倍率は、その延伸した方向に１．３〜１０倍である。延伸倍率が１．３倍未満では、機械的特性の向上が不十分になり、逆に延伸倍率が１０倍を超えると、延伸成形が困難になる。
ここでいう延伸倍率とは、管周方向については、延伸後の管外径と延伸前の管外径との比を、また、管軸方向については、延伸後の管の長さと延伸前の管の長さとの比をいう。
【００２４】
【発明の実施の形態】
以下に本発明の実施例を掲げて更に詳しく説明するが、本発明はこれら実施例に限定されるものではない。
（実施例１〜３、比較例１〜２）
表１に示した所定量の塩素化塩化ビニル樹脂（徳山積水工業社製「ＨＡ−５４Ｋ」、塩素化前平均重合度１０００、塩素含有量６７重量％；「ＨＡ−５４Ｈ」、塩素化前平均重合度１０００、塩素含有量６５重量％；及び「ＨＡ−５４Ｆ」、塩素化前平均重合度１０００、塩素含有量６４重量％）、塩化ビニル樹脂（徳山積水工業社製「ＴＳ−１０００Ｒ」、平均重合度１０００）、エチレン−酢酸ビニル−一酸化炭素共重合体（三井・デュポンケミカル社製「エルバロイ７４２」）、ＮＢＲ（ＪＳＲ社製「ＰＮ２０ＨＡ」）、錫系熱安定剤（三共有機合成社製「ＯＭＦ」）、ステアリン酸（日本油脂社製「ステアリン酸桜印」）、及びポリエチレン系滑剤（三井石油化学社製「Ｈｉｗａｘ２２０ＭＰ」）を、１２０℃に昇温し、ヘンシェルミキサーで混合して樹脂組成物を調整した。
【００２５】
該樹脂組成物を２００℃に加熱したロール成形機を用いて混練した後、２１０℃に加熱したプレス成形機を用いて２０ＭＰａに加圧して板を作成した。得られた板から引張試験用１Ｂ試験片を作成し、上述した評価方法に則ってΔｗ／（ｗ0／ａ1/2）を算出した。
【００２６】
更に、上記樹脂組成物を９０ｍｍ二軸押出機に供給し、各サイズ原管を押出成形した。その後、内径１１４ｍｍ、長さ２ｍの金型内にセットし、原管の内外面をポリエチレングリコールにより１２０〜１７０℃に加熱し、内面のみポンプにより加圧し、外径１１４ｍｍ、厚み３．５ｍｍに延伸した樹脂管を得た。
【００２７】
得られた樹脂管について、下記の評価項目の試験を行い、その結果を表１に示した。
［評価項目］
・延伸倍率（管周方向）：管の外径変化率（ＯＤ1／ＯＤ0）
ＯＤ1：延伸後の管外径、ＯＤ0：延伸前原管の管外径
・延伸倍率（管軸方向）：管の長さ変化率（Ｌ1／Ｌ0）
Ｌ1：延伸後の管の長さ、Ｌ0：延伸前原管の長さ
・延伸後外観：得られた樹脂管を目視により観察し、下記の基準で評価した。
○：肉厚精度が原管肉厚精度と同等で、内外面の平滑性良好
×：肉厚精度が原管肉厚精度より悪化、若しくは局所的に薄肉部発生
【００２８】
【表１】
【発明の効果】
本発明は上述の構成より成り、均一な延伸が可能な塩素化塩化ビニル樹脂管を提供することができるので、給湯管、工業用配管材、工業用板等として好適に使用することができる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a salt iodination vinyl chloride resin tube.
[0002]
[Prior art]
Conventionally, vinyl chloride resin has been widely used for pipes, joints, flat plates, etc. for building materials, water supply, agriculture, industrial use, taking advantage of excellent properties such as mechanical strength, chemical resistance, and oil resistance. Has been.
[0003]
In addition, molded products using chlorinated vinyl chloride resins with improved heat resistance obtained by chlorinating vinyl chloride resins are conventional vinyl chloride resins such as hot water pipes, industrial piping materials, and industrial plates. It has also been used for applications that could not be used with resin moldings.
[0004]
However, the tube molded using the chlorinated vinyl chloride resin has a problem that the impact resistance and crack propagation are not sufficient.
Thus, for example, Japanese Patent Laid-Open No. 10-296821 proposes a method for improving impact resistance. However, in this method, there is a problem that uniform molding is difficult when the tube is stretch-molded. there were.
[0005]
[Problems to be solved by the invention]
The present invention, in order to solve the above problems, and an object thereof is to provide a salt iodinated vinyl chloride resin tube capable uniform in a flat molding.
[0006]
[Means for Solving the Problems]
A chlorinated vinyl chloride resin tube according to the invention of claim 1 (hereinafter referred to as invention 1) is a resin tube obtained by molding the following chlorinated vinyl chloride resin composition (a) at 120 to 170 ° C. The film is stretched in at least one of the tube circumferential direction and the tube axis direction, and the stretch ratio in the stretched direction is 1.3 to 10 times.
Chlorinated vinyl chloride resin composition (a)
A chlorinated vinyl chloride resin having a chlorine content of 60 to 71% by weight ; a thermoplastic elastomer that is an acrylonitrile-butadiene copolymer (NBR) or an ethylene-vinyl acetate-carbon monoxide copolymer (EVACO) ; A chlorinated vinyl chloride resin composition consisting of a test piece having an average width w 0 in accordance with JIS K 7162, and stretched until reaching a predetermined temperature and a predetermined draw ratio,
Δw = (maximum width between marked lines)-(minimum width between marked lines)
Chlorinated vinyl chloride resin composition in which Δw / (w 0 / a 1/2 ) is 0.1 or less when a = (distance between marked lines after stretching) / (distance between marked lines before stretching) .
[0007]
The chlorinated vinyl chloride resin pipe according to the invention of claim 2 (hereinafter referred to as invention 2) is a chlorinated vinyl chloride resin composition according to the invention 1, wherein the chlorine content is 60 to 71% by weight. It consists of 100 parts by weight of a vinyl chloride resin and 0.01 to 20 parts by weight of a thermoplastic elastomer which is acrylonitrile-butadiene copolymer (NBR) or ethylene-vinyl acetate-carbon monoxide copolymer (EVACO). It is characterized by.
Hereinafter, the configuration of the present invention will be described in detail.
[0009]
Oite the present invention, the chlorine content of the chlorinated vinyl chloride resin is 60 to 71 wt%, preferably 62-68 wt%. If the chlorine content is less than 60% by weight, sufficient heat resistance cannot be obtained. Conversely, if the chlorine content exceeds 71% by weight, it becomes difficult to mold a resin tube. In addition, the said chlorine content is calculated | required by the neutralization determination by the oxygen flask combustion method based on JISK7229.
[0010]
The chlorinated vinyl chloride resin is produced by chlorinating a vinyl chloride resin, but the chlorination method is not particularly limited, and conventionally known water suspension methods and solution chlorination methods can be mentioned. In general, the water suspension method is preferred industrially.
[0011]
As a method of adjusting the chlorine content within the range of the present invention, it may be adjusted in the chlorination reaction stage, or a high chlorine content vinyl chloride resin and a low chlorine content vinyl chloride resin are blended. You may adjust it.
[0012]
The vinyl chloride resin is not particularly limited, and is a vinyl chloride homopolymer, a copolymer with a copolymerizable monomer having an unsaturated bond copolymerizable with a vinyl chloride monomer, or a graft copolymer of a vinyl chloride monomer. The graft copolymer etc. which were made are mentioned, These may be individual or 2 or more types may be used together.
[0013]
The copolymer monomer having an unsaturated bond copolymerizable with the vinyl chloride monomer is not particularly limited, and examples thereof include α-olefins such as ethylene, propylene and butylene; vinyl esters such as vinyl acetate and vinyl propionate; Vinyl ethers such as butyl vinyl ether and cetyl vinyl ether; (meth) acrylic esters such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl acrylate and phenyl methacrylate; aromatic vinyls such as styrene and α-methylstyrene; Examples thereof include vinyl halides such as vinylidene chloride and vinylidene fluoride; N-substituted maleimides such as N-phenylmaleimide and N-cyclohexylmaleimide, and these may be used alone or in combination of two or more.
[0014]
Further, the graft copolymer obtained by graft copolymerization with the vinyl chloride monomer is not particularly limited. For example, ethylene-vinyl acetate copolymer; ethylene-vinyl acetate-carbon monoxide copolymer; ethylene-ethyl acrylate copolymer Ethylene-butyl acrylate-carbon monoxide copolymer; ethylene-methyl methacrylate copolymer; ethylene-propylene copolymer; acrylonitrile-butadiene copolymer; polyurethane; chlorinated polyethylene; graft copolymer such as chlorinated polypropylene A polymer is mentioned, These may be used alone or in combination of two or more.
[0015]
The thermoplastic elastomer used in the present invention, A acrylonitrile - butadiene copolymer (NBR) or ethylene - vinyl acetate - are carbon monoxide copolymer (EVACO), it alone also properly is for 併 May be.
[0016]
In the chlorinated vinyl chloride resin composition according to Invention 2, the amount of the thermoplastic elastomer added is 0.01 to 20 parts by weight with respect to 100 parts by weight of the chlorinated vinyl chloride resin. If the addition amount is less than 0.01 parts by weight, it is difficult to uniformly stretch the obtained resin tube. Conversely, if it exceeds 20 parts by weight, the heat resistance and strength of the obtained resin tube may be lowered.
[0017]
The chlorinated vinyl chloride resin composition used in the present invention includes, as necessary, a vinyl chloride resin; a thermal stabilizer such as an alkyl tin mercapto compound and an alkyl tin malate; a polyethylene wax, an ester wax, and stearic acid. , Montanic acid type wax, calcium stearate, etc .; Acrylic type reinforcing agent, chlorinated polyethylene type reinforcing agent, etc .; Pigment; Antistatic agent; Flame retardant; Inorganic filling such as calcium carbonate, talc, clay, mica Agents: Compounding agents such as processing aids such as methacrylic ester resins may be added. Moreover, these compounding agents are uniformly mixed and used by a conventionally known method.
[0018]
The chlorinated vinyl chloride resin composition used in the present invention has a stretching ratio of a, an average width before stretching w 0 , and a variation in width after stretching Δw, Δw / (w 0 / a 1 / 2 ) must be less than 0.1. If this value exceeds 0.1, uniform stretching becomes difficult.
[0019]
The evaluation method of Δw / (w 0 / a 1/2 ) is shown below.
<Evaluation method>
1) After kneading the chlorinated vinyl chloride resin composition using an appropriate molding machine such as a roll molding machine, a plate having a thickness of 3 mm is prepared using a press molding machine.
2) In accordance with JIS K 7162, a 1B type test piece is prepared by machining from the plate obtained in 1).
3) The width of the test piece between the marked lines (5 cm) of JIS K 7162 is measured, and the average width w 0 is calculated.
4) In a temperature-controlled room maintained at a stretching temperature, after sufficiently adjusting the state of the test piece, the test piece was stretched in a stretching temperature atmosphere in accordance with JIS K 7162 until reaching a predetermined stretching ratio, and then tested. Cool the piece to room temperature.
5) The width between the marked lines of the test piece taken out from the temperature-controlled room is measured, and Δw / (w 0 / a 1/2 ) is calculated. Here, the width variation Δw and the draw ratio a are expressed by the following equations.
Δw = (maximum width between marked lines)-(minimum width between marked lines)
a = (Distance between marked lines after stretching) / (Distance between marked lines before stretching)
[0020]
In the present invention, the chlorinated vinyl chloride resin composition obtained by the above method is formed into a resin tube by a known extrusion method using, for example, a single screw extruder or a twin screw extruder.
[0021]
Chlorinated vinyl chloride resin tube according to the present invention, the resin pipe obtained by molding the above chlorinated vinyl chloride resin composition, at 120 to 170 ° C., at least one of the pipe circumferential direction and axial direction of the tube The film is stretched in one direction, and the stretch ratio in the stretched direction is 1.3 to 10 times.
[0022]
The stretching method is not particularly limited. For example, a method in which a raw tube heated to a stretching temperature is stretched in the circumferential and axial directions with a stretching mold, and the raw tube is heated to a stretching temperature with air or liquid and pressurized. And a method of stretching by circumferential extrusion in the circumferential and axial directions, a method of stretching a billet by solid extrusion at a stretching temperature, and the like.
[0023]
The stretching ratio is 1.3 to 10 times in the stretched direction. If the draw ratio is less than 1.3 times, the mechanical properties are not sufficiently improved. Conversely, if the draw ratio exceeds 10 times, stretch molding becomes difficult.
The stretching ratio here refers to the ratio of the tube outer diameter after stretching to the tube outer diameter before stretching in the pipe circumferential direction, and the length of the tube after stretching and before stretching in the pipe axis direction. The ratio to the length of the tube.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
Examples of the present invention will be described in detail below, but the present invention is not limited to these examples.
(Examples 1-3, Comparative Examples 1-2)
Predetermined amount of chlorinated vinyl chloride resin shown in Table 1 (“HA-54K” manufactured by Tokuyama Sekisui Industry Co., Ltd., average degree of polymerization before chlorination 1000, chlorine content 67% by weight; “HA-54H”, average before chlorination) Polymerization degree 1000, chlorine content 65% by weight; and “HA-54F”, average polymerization degree 1000 before chlorination, chlorine content 64% by weight), vinyl chloride resin (“TS-1000R” manufactured by Tokuyama Sekisui Industry Co., Ltd., average) Polymerization degree 1000), ethylene-vinyl acetate-carbon monoxide copolymer (“Elvalloy 742” manufactured by Mitsui DuPont Chemical Co., Ltd.), NBR (“PN20HA” manufactured by JSR Co., Ltd.), tin-based heat stabilizer (Sansha Co., Ltd.) "OMF"), stearic acid (Nippon Yushi Co., Ltd. "Stearic acid cherry"), and polyethylene-based lubricant ("Hiwax220MP" manufactured by Mitsui Petrochemical Co., Ltd.) are heated to 120 ° C. Mixed to adjust the resin composition in Kisa.
[0025]
The resin composition was kneaded using a roll molding machine heated to 200 ° C., and then pressed to 20 MPa using a press molding machine heated to 210 ° C. to prepare a plate. A 1B specimen for tensile test was prepared from the obtained plate, and Δw / (w 0 / a 1/2 ) was calculated according to the evaluation method described above.
[0026]
Further, the resin composition was supplied to a 90 mm twin screw extruder, and each size raw tube was extruded. After that, it is set in a mold having an inner diameter of 114 mm and a length of 2 m, the inner and outer surfaces of the original tube are heated to 120 to 170 ° C. with polyethylene glycol, and only the inner surface is pressurized with a pump, and stretched to an outer diameter of 114 mm and a thickness of 3.5 mm. A resin tube was obtained.
[0027]
The obtained resin pipe was tested for the following evaluation items, and the results are shown in Table 1.
[Evaluation item]
-Stretch ratio (pipe circumferential direction): Change rate of outer diameter of pipe (OD 1 / OD 0 )
OD 1 : pipe outer diameter after drawing, OD 0 : pipe outer diameter and drawing ratio (tube axis direction) of the original pipe before drawing: tube length change rate (L 1 / L 0 )
L 1 : Length of the pipe after drawing, L 0 : Length of the original pipe before drawing and appearance after drawing: The obtained resin pipe was observed visually and evaluated according to the following criteria.
○: Wall thickness accuracy is equivalent to the original tube thickness accuracy, and smoothness of the inner and outer surfaces is good. ×: Wall thickness accuracy is worse than the original tube thickness accuracy, or locally thin parts occur.
[Table 1]
【The invention's effect】
The present invention consists of the above-mentioned configuration, it is possible to provide a salt iodinated vinyl chloride resin tube capable uniform stretching can be suitably used hot water supply pipe, industrial pipe material, as an industrial sheet, etc. .
Claims (2)
塩素化塩化ビニル系樹脂組成物（ａ）
塩素含有量が６０〜７１重量％である塩素化塩化ビニル系樹脂と、アクリロニトリル−ブタジエン共重合体（ＮＢＲ）またはエチレン−酢酸ビニル−一酸化炭素共重合体（ＥＶＡＣＯ）である熱可塑性エラストマーと、からなる塩素化塩化ビニル系樹脂組成物を、ＪＩＳ Ｋ ７１６２に準拠し、平均幅ｗ0の試験片を作成し、所定の温度、所定の延伸倍率に達するまで延伸させた後、
Δｗ＝（標線間での最大幅）―（標線間での最小幅）
ａ＝（延伸後の標線間距離）／（延伸前の標線間距離）とした場合のΔｗ／（ｗ0／ａ1/2）が０．１以下となる塩素化塩化ビニル樹脂組成物。A resin tube obtained by molding the following chlorinated vinyl chloride resin composition (a) is stretched at 120 to 170 ° C. in at least one of the tube circumferential direction and the tube axis direction, and the stretched direction A chlorinated vinyl chloride resin tube characterized by having a draw ratio of 1.3 to 10 times.
Chlorinated vinyl chloride resin composition (a)
A chlorinated vinyl chloride resin having a chlorine content of 60 to 71% by weight ; a thermoplastic elastomer that is an acrylonitrile-butadiene copolymer (NBR) or an ethylene-vinyl acetate-carbon monoxide copolymer (EVACO) ; A chlorinated vinyl chloride resin composition consisting of a test piece having an average width w 0 in accordance with JIS K 7162, and stretched until reaching a predetermined temperature and a predetermined draw ratio,
Δw = (maximum width between marked lines)-(minimum width between marked lines)
Chlorinated vinyl chloride resin composition in which Δw / (w 0 / a 1/2 ) is 0.1 or less when a = (distance between marked lines after stretching) / (distance between marked lines before stretching) .
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| JP2001038584A JP4439750B2 (en) | 2001-02-15 | 2001-02-15 | Chlorinated vinyl chloride resin tube |
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