JPH0114857B2 - - Google Patents
Info
- Publication number
- JPH0114857B2 JPH0114857B2 JP56136821A JP13682181A JPH0114857B2 JP H0114857 B2 JPH0114857 B2 JP H0114857B2 JP 56136821 A JP56136821 A JP 56136821A JP 13682181 A JP13682181 A JP 13682181A JP H0114857 B2 JPH0114857 B2 JP H0114857B2
- Authority
- JP
- Japan
- Prior art keywords
- water
- polyolefin
- group
- pipe
- resin composition
- 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.)
- Expired
Links
- 229920000098 polyolefin Polymers 0.000 claims description 21
- 238000010438 heat treatment Methods 0.000 claims description 14
- 238000004132 cross linking Methods 0.000 claims description 12
- 239000003651 drinking water Substances 0.000 claims description 8
- 235000020188 drinking water Nutrition 0.000 claims description 8
- 239000011342 resin composition Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 6
- 229920005672 polyolefin resin Polymers 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- 239000003054 catalyst Substances 0.000 claims description 4
- 238000009833 condensation Methods 0.000 claims description 4
- 230000005494 condensation Effects 0.000 claims description 4
- 125000000962 organic group Chemical group 0.000 claims description 4
- SCPYDCQAZCOKTP-UHFFFAOYSA-N silanol Chemical compound [SiH3]O SCPYDCQAZCOKTP-UHFFFAOYSA-N 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 125000001183 hydrocarbyl group Chemical group 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- -1 polyethylene Polymers 0.000 description 8
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- 150000001336 alkenes Chemical class 0.000 description 3
- 238000007334 copolymerization reaction Methods 0.000 description 3
- 150000002430 hydrocarbons Chemical group 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 231100000331 toxic Toxicity 0.000 description 3
- 230000002588 toxic effect Effects 0.000 description 3
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 2
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 2
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 239000012975 dibutyltin dilaurate Substances 0.000 description 2
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical compound CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000012286 potassium permanganate Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-N Methacrylic acid Chemical compound CC(=C)C(O)=O CERQOIWHTDAKMF-UHFFFAOYSA-N 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical class [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 description 1
- 150000001734 carboxylic acid salts Chemical class 0.000 description 1
- 239000013522 chelant Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- PNOXNTGLSKTMQO-UHFFFAOYSA-L diacetyloxytin Chemical compound CC(=O)O[Sn]OC(C)=O PNOXNTGLSKTMQO-UHFFFAOYSA-L 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 description 1
- ZLNAFSPCNATQPQ-UHFFFAOYSA-N ethenyl-dimethoxy-methylsilane Chemical compound CO[Si](C)(OC)C=C ZLNAFSPCNATQPQ-UHFFFAOYSA-N 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- GIWKOZXJDKMGQC-UHFFFAOYSA-L lead(2+);naphthalene-2-carboxylate Chemical compound [Pb+2].C1=CC=CC2=CC(C(=O)[O-])=CC=C21.C1=CC=CC2=CC(C(=O)[O-])=CC=C21 GIWKOZXJDKMGQC-UHFFFAOYSA-L 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000001570 methylene group Chemical group [H]C([H])([*:1])[*:2] 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000001451 organic peroxides Chemical class 0.000 description 1
- 150000002902 organometallic compounds Chemical class 0.000 description 1
- 229920001515 polyalkylene glycol Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 229920002545 silicone oil Polymers 0.000 description 1
- CHJMFFKHPHCQIJ-UHFFFAOYSA-L zinc;octanoate Chemical compound [Zn+2].CCCCCCCC([O-])=O.CCCCCCCC([O-])=O CHJMFFKHPHCQIJ-UHFFFAOYSA-L 0.000 description 1
Landscapes
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
Description
【発明の詳細な説明】
架橋ポリオレフインからなるパイプは、耐熱
性、機械強度、とりわけ耐環境応力亀裂性に優れ
ていることから、水道管、給湯管などとして有望
視されている。
本発明者らは、水架橋ポリオレフインパイプを
飲用水用パイプとして実用化すべく研究を重ねて
来たところ、水架橋ポリオレフインパイプ中に
は、有毒有機成分、即ち未反応のグラフト化剤
（例、ビニルトリメトキシシラン）、グラフト開始
剤としての架橋剤の分解生成物、グラフト反応に
よつて生成するメタノール、その他の有毒有機成
分が予想外に多量に残存しており、飲用水用の配
管としてはとうてい使用不可能であることが判明
した。その残存量は、製造後１ケ月を経過したも
のでさえ、100〜300ppmにも達するものである。
本発明者らは、かかる新規な技術的課題を解決
して水架橋ポリオレフインパイプを飲用水用配管
として使用可能とすべく種々研究を重ねて来たと
ころ、下記の如き特定の条件下で(a)ポリオレフイ
ン、(b)一般式RR′SiY2（但し、Ｒは１価のオレフ
イン性不飽和を含む炭化水素基又は、ハイドロカ
ーボンオキシ基、Ｙは加水分解しうる有機基、
R′は基Ｒまたは基Ｙを表わす）、(c)140℃以上の
温度において上記ポリオレフインに遊離ラジカル
を発生させる化合物および(d)シラノール縮合触媒
からなる水架橋性ポリオレフイン樹脂組成物であ
つて、成型、架橋後に飲用水用配管として使用し
えない程度に有害有機成分を残存しうる水架橋性
ポリオレフイン樹脂組成物をパイプ状に成型した
後の任意の工程において下記特定条件下で加熱処
理すれば、そこに残存している有害有機成分が分
解、揮散して飲用水用配管として使用可能な水架
橋ポリオレフインパイプが得られることを見出し
て本発明を完成した。
即ち、本発明は新規な技術的課題を見出し、こ
れに基づいて更に研究を重ねて当該課題を解決し
たものであり、(a)ポリオレフイン、(b)一般式
RR′SiY2（但し、Ｒは１価のオレフイン性不飽和
を含む炭化水素基又は、ハイドロカーボンオキシ
基、Ｙは加水分解しうる有機基、R′は基Ｒまた
は基Ｙを表わす）、(c)140℃以上の温度において上
記ポリオレフインに遊離ラジカルを発生させる化
合物および(d)シラノール縮合触媒からなる水架橋
性ポリオレフイン樹脂組成物であつて、成型、架
橋後に飲用水用配管として使用しえない程度に有
毒有機成分を残存しうる水架橋性ポリオレフイン
樹脂組成物をパイプ状に成型した後、任意の工程
にて
to≧20d2exp｛0.75×104（１／Ｔ−１／296）｝ 〔た
だ
し、toは加熱時間（hr.）を、ｄはパイプ肉厚
（mm）を、Ｔは加熱温度（〓）を表わす〕
の条件下で加熱処理を行う飲用水配管として使用
しうる水架橋ポリオレフインパイプの製造法であ
る。
本発明において、原料材として用いられる水架
橋型ポリオレフイン樹脂組成物は、(a)ポリオレフ
イン〔好ましくはポリエチレンであり、その密度
は一般に0.91〜0.97である。〕に(b)一般式RR′SiY2
（Ｒは１価のオレフイン性不飽和を含む炭化水素
基又は、ハイドロカーボンオキシ基、Ｙは加水分
解しうる有機基、R′は基Ｒ又は基Ｙ）で表わさ
れる化合物と、(c)140℃以上の温度において上記
ポリオレフインに遊離ラジカルを発生させる化合
物と(d)シラノール縮合触媒とからなるものであ
る。
(a) 成分としてはポリメチレン、ポリエチレン、
ポリスチレンなどのホモポリマー、メチレンを
主体としてエチレン、プロピレン等が共重合し
たもの、エチレンを主体としてメチレン、プロ
ピレン、ブテン等が共重合したもの、プロピレ
ンを主体として他のオレフインが共重合したも
のなどのオレフイン同志のコポリマー、エチレ
ン、プロピレン、ブテンなどのオレフインと他
のモノマー（例：酢酸ビニル、アクリル酸、メ
タクリル酸）とのコポリマーなどがあげられ
る。
(b) 成分としては、シラン化合物として既知のも
の、たとえばビニルトリエトキシシラン、ビニ
ルメチルジメトキシシランなどがあげられる。
(c) 成分としては、たとえばジクミルパーオキサ
イド、２，５−ジメチル−２，５−ジ−（ｔ−
ブチルパーオキシ）−ヘキシン−３などの有機
過酸化物架橋剤、アゾビス−イソブチロニトリ
ル、ジメチルアゾイソジブチレート等のアゾ化
合物などがあげられる。
(d) 成分としてはジブチル錫ジラウレート、酢酸
第一錫、ナフテン酸鉛、カプリル酸亜鉛の如き
カルボン酸塩、チタン酸エステル、キレート化
合物の如き有機金属化合物などがあげられる。
これら成分の配合比は、任意に選択すればよい
が、たとえば(a)成分100重量部（以下、重量部）
あたり、(b)成分0.1〜50部、好ましくは0.5〜10
部、(c)成分0.05〜1.5部、好ましくは0.01〜0.2部、
(d)成分0.005〜５部、好ましくは0.01〜0.5部であ
る。
加熱処理は、管状に成形後の任意の工程、具体
的には架橋前、架橋中、架橋後に行われ、これら
いずれの工程における加熱処理によつても良好に
有毒有機成分の除去が達成される。
ところで、非架橋ポリオレフインパイプは架橋
パイプに較べてジヨイントが極めて容易であると
ころから、架橋前に加熱処理を行い未架橋にて出
荷してジヨイント・布設を行つた後、通水使用し
ながら水架橋することが好ましい。即ち、好まし
い加熱処理時期は、架橋前である。
架橋前の加熱処理は、一般に循環空気中、水を
含まない非活性液体（例、シリコーン油、ポリア
ルキレングリコール油など）中で行われ、加熱温
度は常温以上、未架橋ポリオレフインパイプの融
点以下（一般的には50℃〜120℃）である。
架橋中の加熱処理は加熱水中、水蒸気中等で行
われ、加熱温度は架橋前におけると同様である。
架橋後の加熱処理は循環空気中、加熱水中、水
蒸気中、水を含まない不活性液体中で行われ、加
熱温度は常温（例、50℃）以上、水架橋ポリオレ
フインパイプが劣化しない範囲内で可及的高温、
たとえば約400℃で行われる。
本発明に係る水架橋性ポリオレフインパイプの
成型、架橋には、自体既知の成型、架橋手段を用
いることができる。たとえば押出成型した、未架
橋ポリオレフインパイプを前述の加熱処理に付し
または付さずに水雰囲気下（たとえば水中に浸
漬、通水、水蒸気中）にさらすことによつて容易
に成形および架橋することができる。
本発明に関して、水架橋ポリオレフインパイプ
の肉厚は一般に１〜50mm、好ましくは１〜20mmで
ある。
実施例、比較例
次の如き樹脂組成物を第１表に示した条件ない
し状態にてパイプとした後、JIS K6762−1966の
６・５項記載の方法に準じて検水の採取を行い、
当該検水について厚生省環境衛生局水道環境部監
修：「上水試験方法−1978年版」（昭和53年、日本
水道協会発行）の第15章「過マンガン酸カリウム
消費量」に記載の方法に準じて測定した過マンガ
ン酸カリウムの消費量は第１表に示した通りであ
る。
パイプ用樹脂組成：（密度：0.935ｇ／cm2、メル
トインデツクス：0.8ｇ／10分）
のポリエチレン 100部
ビニルトリメトキシシラン 2.2部
ジクミルパーオキサイド 0.2部
ジブチル−錫−ジラウレート 0.05部
【表】DETAILED DESCRIPTION OF THE INVENTION Pipes made of crosslinked polyolefin have excellent heat resistance, mechanical strength, and especially resistance to environmental stress cracking, and are therefore considered promising as water pipes, hot water supply pipes, and the like. The present inventors have conducted repeated research to put water-crosslinked polyolefin pipes into practical use as drinking water pipes, and have found that water-crosslinked polyolefin pipes contain toxic organic components, i.e., unreacted grafting agents (e.g., vinyl trimethoxysilane), decomposition products of the crosslinking agent used as a graft initiator, methanol produced by the graft reaction, and other toxic organic components remain in unexpectedly large amounts, making it extremely difficult to use as a pipe for drinking water. It turned out to be unusable. The residual amount reaches 100 to 300 ppm even one month after production. The present inventors have conducted various researches in order to solve this new technical problem and make water-crosslinked polyolefin pipes usable as drinking water piping, and found that under the following specific conditions (a ) polyolefin, (b) general formula RR′SiY 2 (where R is a hydrocarbon group containing monovalent olefinic unsaturation or a hydrocarbonoxy group, Y is a hydrolyzable organic group,
R′ represents a group R or a group Y), (c) a compound that generates free radicals in the polyolefin at a temperature of 140° C. or higher, and (d) a silanol condensation catalyst, the water-crosslinkable polyolefin resin composition comprising: If a water-crosslinkable polyolefin resin composition, which may retain harmful organic components to such an extent that it cannot be used as drinking water pipes after molding and crosslinking, is heat-treated under the following specific conditions in any step after being molded into a pipe shape. The inventors completed the present invention by discovering that the harmful organic components remaining therein can be decomposed and volatilized to obtain a water-crosslinked polyolefin pipe that can be used as drinking water piping. That is, the present invention found a new technical problem, and based on this, further research was conducted to solve the problem. (a) polyolefin, (b) general formula
RR′SiY 2 (wherein, R is a hydrocarbon group containing monovalent olefinic unsaturation or a hydrocarbonoxy group, Y is a hydrolyzable organic group, and R′ is a group R or a group Y), ( c) A water-crosslinkable polyolefin resin composition consisting of a compound that generates free radicals in the polyolefin at a temperature of 140°C or higher and (d) a silanol condensation catalyst, which cannot be used as drinking water piping after molding and crosslinking. [ _ However, to is the heating time (hr.), d is the pipe wall thickness (mm), and T is the heating temperature (〓)]. This is a method of manufacturing pipes. In the present invention, the water-crosslinked polyolefin resin composition used as a raw material is (a) polyolefin [preferably polyethylene, and its density is generally 0.91 to 0.97. ] to (b) general formula RR′SiY 2
(R is a hydrocarbon group containing monovalent olefinic unsaturation or a hydrocarbonoxy group, Y is a hydrolyzable organic group, R' is a group R or a group Y), and (c) 140 It consists of a compound that generates free radicals in the polyolefin at temperatures above .degree. C. and (d) a silanol condensation catalyst. (a) Ingredients include polymethylene, polyethylene,
Homopolymers such as polystyrene, copolymerization of methylene with ethylene, propylene, etc., copolymerization of ethylene with methylene, propylene, butene, etc., copolymerization of propylene with other olefins, etc. Examples include copolymers of olefins, copolymers of olefins such as ethylene, propylene, butene, and other monomers (eg, vinyl acetate, acrylic acid, methacrylic acid). Component (b) includes known silane compounds such as vinyltriethoxysilane and vinylmethyldimethoxysilane. Component (c) includes, for example, dicumyl peroxide, 2,5-dimethyl-2,5-di-(t-
Examples include organic peroxide crosslinking agents such as (butylperoxy)-hexyne-3, and azo compounds such as azobis-isobutyronitrile and dimethylazoisodibutyrate. Component (d) includes carboxylic acid salts such as dibutyltin dilaurate, stannous acetate, lead naphthenate, and zinc caprylate, and organometallic compounds such as titanate esters and chelate compounds. The blending ratio of these components may be selected arbitrarily, but for example, 100 parts by weight of component (a) (hereinafter referred to as parts by weight)
per component (b) 0.1 to 50 parts, preferably 0.5 to 10 parts
parts, component (c) 0.05 to 1.5 parts, preferably 0.01 to 0.2 parts,
The amount of component (d) is 0.005 to 5 parts, preferably 0.01 to 0.5 parts. Heat treatment is performed at any step after forming into a tubular shape, specifically before, during, and after crosslinking, and removal of toxic organic components can be successfully achieved by heat treatment in any of these steps. . By the way, since non-crosslinked polyolefin pipes are much easier to joint than crosslinked pipes, they are heat-treated before crosslinking, shipped uncrosslinked, jointed and laid, and then water crosslinked while passing water. It is preferable to do so. That is, the preferable heat treatment time is before crosslinking. The heat treatment before crosslinking is generally carried out in circulating air and in an inert liquid (e.g. silicone oil, polyalkylene glycol oil, etc.) that does not contain water, and the heating temperature is above room temperature and below the melting point of the uncrosslinked polyolefin pipe ( Generally 50°C to 120°C). The heat treatment during crosslinking is performed in heated water, steam, etc., and the heating temperature is the same as that before crosslinking. The heat treatment after crosslinking is carried out in circulating air, heated water, steam, or an inert liquid that does not contain water, and the heating temperature is above room temperature (e.g. 50℃) and within a range that does not deteriorate the water-crosslinked polyolefin pipe. High temperature possible,
For example, it is carried out at about 400℃. For molding and crosslinking of the water-crosslinkable polyolefin pipe according to the present invention, known molding and crosslinking means can be used. For example, extrusion-molded, uncrosslinked polyolefin pipe can be easily formed and crosslinked by exposing it to a water atmosphere (for example, immersion in water, water passage, or steam) with or without subjecting it to the above-mentioned heat treatment. Can be done. In the context of the present invention, the wall thickness of the water-crosslinked polyolefin pipe is generally between 1 and 50 mm, preferably between 1 and 20 mm. Examples and Comparative Examples After making the following resin composition into a pipe under the conditions shown in Table 1, water samples were collected according to the method described in Sections 6 and 5 of JIS K6762-1966.
The water test was conducted in accordance with the method described in Chapter 15 "Potassium Permanganate Consumption" of "Water Water Testing Methods - 1978 Edition" (1978, published by the Japan Water Works Association), supervised by the Water Supply Environment Department, Environmental Sanitation Bureau, Ministry of Health and Welfare. Table 1 shows the amount of potassium permanganate consumed. Pipe resin composition: (density: 0.935 g/cm 2 , melt index: 0.8 g/10 min) polyethylene 100 parts vinyltrimethoxysilane 2.2 parts dicumyl peroxide 0.2 parts dibutyl-tin-dilaurate 0.05 parts [Table]
Claims (1)
Ｒは１価のオレフイン性不飽和を含む炭化水素基
又は、ハイドロカーボンオキシ基、Ｙは加水分解
しうる有機基、R′は基Ｒまたは基Ｙを表わす）、
(c)140℃以上の温度において上記ポリオレフイン
に遊離ラジカルを発生させる化合物および(d)シラ
ノール縮合触媒からなる水架橋性ポリオレフイン
樹脂組成物であつて、成型、架橋後に飲用水用配
管として使用しえない程度に有害有機成分を残存
しうる水架橋性ポリオレフイン樹脂組成物をパイ
プ状に成型した後の任意の工程にて to≧20d2exp｛0.75×104（１／Ｔ−１／296）｝ 〔ただし、t0は加熱時間（hr.）を、ｄはパイ
プ肉厚（mm）を、Ｔは加熱温度（〓）を表わす〕 の条件下で加熱処理することを特徴とする飲用水
用配管として使用しうる水架橋ポリオレフインパ
イプの製造法。[Claims] 1 (a) polyolefin, (b) general formula RR′SiY 2 (however,
R is a hydrocarbon group containing monovalent olefinic unsaturation or a hydrocarbonoxy group, Y is a hydrolyzable organic group, R' is a group R or a group Y),
A water-crosslinkable polyolefin resin composition comprising (c) a compound that generates free radicals in the polyolefin at a temperature of 140°C or higher and (d) a silanol condensation catalyst, which can be used as drinking water piping after molding and crosslinking. To≧20d 2 exp {0.75×10 4 (1/T - 1/296)} in any step after molding a water-crosslinkable polyolefin resin composition in which harmful organic components can remain to a certain extent into a pipe shape. [However, t 0 represents the heating time (hr.), d represents the pipe wall thickness (mm), and T represents the heating temperature (〓)] Drinking water piping characterized by being heat treated under the following conditions. A method for producing a water-crosslinked polyolefin pipe that can be used as a water-crosslinked polyolefin pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13682181A JPS5838727A (en) | 1981-08-31 | 1981-08-31 | Preparation of polyolefin pipe crosslinked in the presence of water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13682181A JPS5838727A (en) | 1981-08-31 | 1981-08-31 | Preparation of polyolefin pipe crosslinked in the presence of water |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5838727A JPS5838727A (en) | 1983-03-07 |
| JPH0114857B2 true JPH0114857B2 (en) | 1989-03-14 |
Family
ID=15184290
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13682181A Granted JPS5838727A (en) | 1981-08-31 | 1981-08-31 | Preparation of polyolefin pipe crosslinked in the presence of water |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5838727A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2535376B2 (en) * | 1988-04-21 | 1996-09-18 | 住友軽金属工業株式会社 | Method for improving hygiene of cross-linked polyethylene pipe |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5229338A (en) * | 1975-08-28 | 1977-03-05 | Tooru Mashida | Method of producing waist belt or the like |
| JPS5345378A (en) * | 1976-10-04 | 1978-04-24 | Sekisui Chemical Co Ltd | Method of manufacture of steel pipe having polyolefine lining |
| JPS5613134A (en) * | 1979-07-12 | 1981-02-09 | Showa Electric Wire & Cable Co Ltd | Manufacture of anticorrosion metallic pipe |
| JPS5688446A (en) * | 1979-12-20 | 1981-07-17 | Mitsubishi Petrochem Co Ltd | Bridged polyethylene resin pipe |
-
1981
- 1981-08-31 JP JP13682181A patent/JPS5838727A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5229338A (en) * | 1975-08-28 | 1977-03-05 | Tooru Mashida | Method of producing waist belt or the like |
| JPS5345378A (en) * | 1976-10-04 | 1978-04-24 | Sekisui Chemical Co Ltd | Method of manufacture of steel pipe having polyolefine lining |
| JPS5613134A (en) * | 1979-07-12 | 1981-02-09 | Showa Electric Wire & Cable Co Ltd | Manufacture of anticorrosion metallic pipe |
| JPS5688446A (en) * | 1979-12-20 | 1981-07-17 | Mitsubishi Petrochem Co Ltd | Bridged polyethylene resin pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5838727A (en) | 1983-03-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0135923B1 (en) | Production of water-curable, silane modified thermoplastic polymers | |
| US4228255A (en) | Method for producing crosslinked polyethylenes | |
| JPS6223978B2 (en) | ||
| JPS61195141A (en) | Silane crosslinkable copolymer composition | |
| JPS6223777B2 (en) | ||
| JPH02115234A (en) | Production of crosslinked polyvinylidene fluoride | |
| JPH0114857B2 (en) | ||
| DE2255116C3 (en) | Cross-linking of polymers | |
| DE2234717A1 (en) | PROCESS FOR THE PRODUCTION OF COMPOUNDS CONTAINING SILICON | |
| JPH08323898A (en) | Crosslinked polyethylene pipe | |
| EP0002910A1 (en) | Curable silane-modified ethylene polymer composition and shaped articles made therefrom | |
| JPS63207833A (en) | Production of crosslinked polyethylene foam | |
| JPS581530A (en) | Method for continuously preparing crosslinked polyolefin tubular body | |
| JPS6137513B2 (en) | ||
| JPS6223977B2 (en) | ||
| JP2000154889A (en) | Crosslinked polyolefin pipe | |
| JPS6084332A (en) | Production of crosslinked polyolefin pipe | |
| JP2001289367A (en) | Water and hot water feed pipe body and hose | |
| JP3581744B2 (en) | Crosslinked polyolefin pipe | |
| JPS5857582A (en) | Water cross-linking polyolefin pipe | |
| JPS6358090B2 (en) | ||
| JPS60262829A (en) | Production of heat-shrinkable polyolefin tube | |
| JPS6011968B2 (en) | Crosslinking treatment method for ethylene/vinyl ester copolymer-vinyl chloride graft copolymer | |
| JPS60139713A (en) | Production of crosslinked polyethylene-insulated wire | |
| JPH03134918A (en) | Manufacture of cross linked polyethylene resin coated electric wire |