JPS6329701B2 - - Google Patents
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- Publication number
- JPS6329701B2 JPS6329701B2 JP55132792A JP13279280A JPS6329701B2 JP S6329701 B2 JPS6329701 B2 JP S6329701B2 JP 55132792 A JP55132792 A JP 55132792A JP 13279280 A JP13279280 A JP 13279280A JP S6329701 B2 JPS6329701 B2 JP S6329701B2
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene
- density
- weight
- parts
- chlorine
- 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
- 239000004698 Polyethylene Substances 0.000 claims description 30
- -1 polyethylene Polymers 0.000 claims description 30
- 229920000573 polyethylene Polymers 0.000 claims description 30
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 21
- 239000000460 chlorine Substances 0.000 claims description 21
- 229910052801 chlorine Inorganic materials 0.000 claims description 21
- 239000000203 mixture Substances 0.000 claims description 12
- 239000000155 melt Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 21
- 229920001684 low density polyethylene Polymers 0.000 description 7
- 239000004702 low-density polyethylene Substances 0.000 description 7
- 229920001903 high density polyethylene Polymers 0.000 description 5
- 239000004700 high-density polyethylene Substances 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 239000008188 pellet Substances 0.000 description 4
- 239000006229 carbon black Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000005227 gel permeation chromatography Methods 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Description
【発明の詳細な説明】
本発明は耐塩素水性に優れたポリエチレン管に
関する。さらに詳しくは特定のポリエチレンをブ
レンドしたポリエチレン組成物から成形された塩
素水に対して高い抵抗性を有するポリエチレン管
に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polyethylene pipe with excellent chlorine water resistance. More specifically, the present invention relates to a polyethylene pipe molded from a polyethylene composition blended with a specific polyethylene and having high resistance to chlorine water.
従来、ポリエチレン管には可撓性に富む低密度
ポリエチレン管と剛性に富む高密度ポリエチレン
管があるが、前者は軟らかく曲げ易いため、施工
性り優れており、水道管、太陽熱温水器導管等に
広く使用されている。しかしながら従来の高圧法
低密度ポリエチレンは、高密度ポリエチレンに比
較して耐薬品性が劣り、この為低密度ポリエチレ
ン管を殺菌用としての塩素ガスを含む水道水の導
管として長時間使用すると、徐々に管が侵され、
管内面が厚さ40〜60μで剥離し、該剥離物がメー
ター類をつまらせたり、又、管本体の寿命が低下
したりする為、耐塩素水性の高いポリエチレン管
が望まれていた。 Conventionally, there are two types of polyethylene pipes: low-density polyethylene pipes with high flexibility and high-density polyethylene pipes with high rigidity.The former is soft and easy to bend, so it has excellent construction properties, and is used for water pipes, solar water heater conduits, etc. Widely used. However, conventional high-pressure low-density polyethylene has inferior chemical resistance compared to high-density polyethylene, and for this reason, if low-density polyethylene pipes are used for a long time as a conduit for tap water containing chlorine gas for sterilization, tubes are affected,
A polyethylene pipe with high resistance to chlorinated water has been desired because the inner surface of the pipe peels off at a thickness of 40 to 60 μm, and the peeled off material clogs meters and shortens the life of the pipe body.
本発明者は、低密度ポリエチレン管の上記のよ
うな欠点の解決を目的とし鋭意検討した結果、ポ
リエチレンの分子量及び分子量分布が耐塩素水に
影響する事、及び、特定のポリエチレンを所定量
ブレンドする事により耐塩素水性を著しく改善で
きることを見出し本発明を完成した。 As a result of intensive studies aimed at resolving the above-mentioned drawbacks of low-density polyethylene pipes, the inventor of the present invention found that the molecular weight and molecular weight distribution of polyethylene affect chlorine-resistant water, and that a specific amount of polyethylene is blended in a predetermined amount. The present invention was completed based on the discovery that chlorine water resistance could be significantly improved.
即ち、本発明は、耐塩素水性に優れた可撓性ポ
リエチレン管を提供することを目的としたもので
あり、密度0.935〜0.910ｇ／cm3、メルトインデツ
クスが1.0ｇ／10min以下、重量平均分子量Wと
数平均分子量Nとの比W／Nが３〜10の高圧
法ポリエチレン95〜70重量部と、密度0.930〜
0.965ｇ／cm3メルトインデツクスが30ｇ／10min
以下の中低圧法ポリエチレン５〜30重量部とから
なるポリエチレン組成物により成形された耐塩素
水性ポリエチレン管にある。 That is, the present invention aims to provide a flexible polyethylene pipe with excellent chlorine water resistance, a density of 0.935 to 0.910 g/cm 3 , a melt index of 1.0 g/10 min or less, and a weight average 95 to 70 parts by weight of high-pressure polyethylene with a ratio W / N of molecular weight W to number average molecular weight N of 3 to 10, and a density of 0.930 to
0.965g/cm 3 Melt index is 30g/10min
The present invention is a chlorine-resistant water-resistant polyethylene pipe molded from a polyethylene composition comprising 5 to 30 parts by weight of the following medium-low pressure polyethylene.
耐塩素水性に優れたポリエチレン管を成形する
為の組成物は下記に規定するような特定の低密度
ポリエチレンと中高密度ポリエチレンとを組合わ
せることによつて得ることができる。上記低密度
ポリエチレンとしては、酸素やラジカル開始剤を
用いて製造されたもので、密度0.935〜0.910ｇ／
cm3、好ましくは0.915〜0.925ｇ／cm3、メルトイン
デツクスが（以下MIと記す）１ｇ／10min以下
好ましくは0.1〜0.6ｇ／10min最も好ましくは0.2
〜0.4ｇ／10minであり、かつ、分子量分布の指
標としての重量平均分子量Wと数平均分子量N
との比W／Nが３〜10好ましくは４〜〜６と分
布の狭いものが適当である。MIが１をこれると
耐塩素水性が低く好ましくない。又W／Nが10
をこえるような分子量分布が広い場合には、耐塩
素水性向上効果が低く好ましくない。 A composition for molding polyethylene pipes with excellent chlorine water resistance can be obtained by combining specific low density polyethylene and medium-high density polyethylene as defined below. The above-mentioned low-density polyethylene is manufactured using oxygen or a radical initiator, and has a density of 0.935 to 0.910 g/
cm 3 , preferably 0.915 to 0.925 g/cm 3 , melt index (hereinafter referred to as MI) 1 g/10 min or less, preferably 0.1 to 0.6 g/10 min, most preferably 0.2
~0.4g/10min, and weight average molecular weight W and number average molecular weight N as indicators of molecular weight distribution
It is suitable that the ratio W / N is 3 to 10, preferably 4 to 6, which is a narrow distribution. When MI is less than 1, the resistance to chlorine water is low and is not preferred. Also W / N is 10
If the molecular weight distribution is wide, exceeding , the effect of improving chlorine water resistance will be low, which is not preferable.
一方中高密度ポリエチレンとしては、いわゆる
中低圧法にて製造されたもので、密度が0.930〜
0.965ｇ／cm3好ましくは0.933〜0.950ｇ／cm3、MI
が30ｇ／10min以下、好ましくは0.2〜20ｇ／
10minのものが適当である。 On the other hand, medium-high density polyethylene is manufactured using the so-called medium-low pressure method, and has a density of 0.930~
0.965g/cm 3 preferably 0.933-0.950g/cm 3 , MI
is 30g/10min or less, preferably 0.2~20g/
10 min is suitable.
かかる中高密度ポリエチレンの低密度ポリエチ
レンへのブレンド割合は５〜30重量部、好ましく
は10〜20重量部が適当である。混合割合が５重量
部未満では、耐塩素水性が小さく、30重量部をこ
えると管の可撓性に乏しくなり好ましくない。管
の適当な可撓性をもたせる為にはブレンド組成物
のステイフネスが2500Kg／cm2以下にするのが好ま
しい。 The appropriate blending ratio of such medium-high density polyethylene to low density polyethylene is 5 to 30 parts by weight, preferably 10 to 20 parts by weight. If the mixing ratio is less than 5 parts by weight, the resistance to chlorine water will be low, and if it exceeds 30 parts by weight, the flexibility of the pipe will become poor, which is not preferable. In order to provide appropriate flexibility to the tube, it is preferable that the stiffness of the blend composition is 2500 kg/cm 2 or less.
本発明のポリエチレン管には上記２主成分の他
に、通常配合される各種補助成分例えば、酸化防
止剤、紫外線劣化防止剤、帯電防止剤、着色剤、
カーボンブラツク等を含有することができる。 In addition to the above-mentioned two main components, the polyethylene pipe of the present invention contains various auxiliary components, such as antioxidants, ultraviolet deterioration inhibitors, antistatic agents, colorants,
It can contain carbon black and the like.
また上記２主成分及び必要に応じて補助成分を
混練する方法としては各成分相互が十分に分散さ
れるものであれば特に限定されないが例えばバン
バリーミキサーあるいは二軸混練用押出機などに
よる方法があげられる。 The method for kneading the above two main components and optionally auxiliary components is not particularly limited as long as each component is sufficiently dispersed, but examples include methods using a Banbury mixer or a twin-screw extruder. It will be done.
このよううにして得られた混練物は通常の押出
し成形法により所望の管として成形される。本発
明によれば、耐塩素水性が高く、かつ、可撓性に
富む施工性に秀れたポリエチレン管を得ることが
できる。 The kneaded product thus obtained is molded into a desired tube by a conventional extrusion method. According to the present invention, it is possible to obtain a polyethylene pipe that has high chlorine water resistance, is highly flexible, and has excellent workability.
以下実施例によつて本発明をさらに詳細に説明
する。なお本発明における測定方法は下記の通り
である。 The present invention will be explained in more detail below using Examples. The measuring method in the present invention is as follows.
(1) MI：JIS K6760に準処し宝工業製メルトイ
ンデクサーにより測定した。(1) MI: Measured using a Takara Kogyo melt indexer in accordance with JIS K6760.
(2) 分子量分布：ゲルパーミエイシヨンクロマト
グラフイーにより重量平均分子量（W）、及
び数平均分子量（N）を求めその比を分子量
分布の尺度とした。(2) Molecular weight distribution: Weight average molecular weight ( W ) and number average molecular weight ( N ) were determined by gel permeation chromatography, and the ratio thereof was used as a measure of molecular weight distribution.
(3) ステフイネス：ASTM D747により測定。(3) Stiffness: Measured according to ASTM D747.
(4) 耐塩素水性：2000ppmの塩素を含む40℃の塩
素水中に管状試験片を浸漬すると、塩素によつ
て侵されて試験片管内面にフクレが発生してく
るので、フクレの発生するまでの時間の長さを
もつて耐塩素水性の尺度とする。(4) Chlorine water resistance: When a tubular test piece is immersed in 40℃ chlorine water containing 2000 ppm chlorine, the inner surface of the test piece tube will be eroded by the chlorine and blister will occur. The length of time is taken as a measure of chlorine water resistance.
実施例 １
密度0.920ｇ／cm3、MI0.25ｇ／10min、W／
MN値が4.0の高圧法ポリエチレン91重量部に対
し、密度0.944ｇ／cm3、MI20ｇ／10minの低圧法
ポリエチレン９重量部を二軸押出機で混合ペレツ
ト化し、密度0.923ｇ／cm3MI0.40ｇ／10minの組
成物を得た。該組成物にカーボンブラツク２重量
％混合し外径60mm、肉厚８mmの可撓性ポリエチレ
ン管を成形し、耐塩素水性を測定した。72時間後
に管内表面にフクレを発生した。Example 1 Density 0.920g/cm 3 , MI 0.25g/10min, W /
91 parts by weight of high-pressure polyethylene with a M N value of 4.0 and 9 parts by weight of low-pressure polyethylene with a density of 0.944 g/cm 3 and an MI of 20 g/10 min were mixed into pellets using a twin-screw extruder, resulting in a pellet with a density of 0.923 g/cm 3 MI0. A composition of 40g/10min was obtained. 2% by weight of carbon black was mixed with the composition to form a flexible polyethylene tube having an outer diameter of 60 mm and a wall thickness of 8 mm, and its resistance to chlorine water was measured. After 72 hours, blistering occurred on the inner surface of the tube.
実施例 ２
密度0.919ｇ／cm3、MI0.3ｇ／10min、W／N
値が4.5の高圧法ポリエチレン80重量部に対し、
密度0.935ｇ／cm3MI0.3ｇ／10minの低圧法ポリエ
チレン20重量部を＝軸押出機で混合ペレツト化
し、密度0.922ｇ／cm3 MI0.3ｇ／10minの組成物
を得た。該組成物にカーボンブラツク２重量％を
混合し、外径60mm、肉厚８mmの可撓性ポリエチレ
ン管を成形し、耐塩素水性を測定した。120時間
後に管内表面にフクレを発生した。Example 2 Density 0.919g/cm 3 , MI 0.3g/10min, W / N
For 80 parts by weight of high-pressure polyethylene with a value of 4.5,
20 parts by weight of low pressure polyethylene having a density of 0.935 g/cm 3 MI 0.3 g/10 min was mixed into pellets using a screw extruder to obtain a composition having a density 0.922 g/cm 3 MI 0.3 g/10 min. 2% by weight of carbon black was mixed with the composition, and a flexible polyethylene tube having an outer diameter of 60 mm and a wall thickness of 8 mm was molded, and its resistance to chlorine water was measured. After 120 hours, blistering occurred on the inner surface of the tube.
比較例 １
密度0.920ｇ／cm3MI10ｇ／10min、W／N値
が７の高圧法ポリエチレン85重量部に対し、密度
0.945ｇ／cm3、MI0.1ｇ／10minの低圧法ポリエチ
レン15重量部を二軸押出機で混合ペレツト化し密
度0.923ｇ／cm3、MI5ｇ／10minの組成物を得た。
実施例１と同様にして耐塩素水を測定したところ
７時間後に管内表面にフクレを発生した。Comparative Example 1 Density 0.920g/cm 3 MI10g/10min, W / N value 7 high pressure polyethylene 85 parts by weight, density
15 parts by weight of low-pressure polyethylene having a density of 0.945 g/cm 3 and an MI of 0.1 g/10 min were mixed into pellets using a twin-screw extruder to obtain a composition having a density of 0.923 g/cm 3 and an MI of 5 g/10 min.
When the chlorine-resistant water was measured in the same manner as in Example 1, blisters were found on the inner surface of the tube after 7 hours.
比較例 ２
密度0.917ｇ／cm3、MI0.7ｇ／10min、W／N
値が12の高圧法ポリエチレン80重量部に対し、密
度0.950ｇ／cm3、MI0.1ｇ／10minの低圧法ポリエ
チレン20重量部を二軸押出機でペレツト化し、密
度0.924ｇ／cm3、MI0.5ｇ／10minの組成物を得
た。実施例１と同様にして耐塩素水を測定したと
ころ26時間後に管内表面にフクレを発生した。Comparative example 2 Density 0.917g/ cm3 , MI0.7g/10min, W / N
80 parts by weight of high-pressure polyethylene with a value of 12 and 20 parts by weight of low-pressure polyethylene with a density of 0.950 g/cm 3 and an MI of 0.1 g/ 10 min are pelletized using a twin-screw extruder. A composition of 5g/10min was obtained. When the chlorine-resistant water was measured in the same manner as in Example 1, blisters were found on the inner surface of the tube after 26 hours.
Claims (1)
スが1.0ｇ／10min以下、重量平均分子量Wと数
平均分子量Nとの比W／Nが３〜10の高圧法
ポリエチレン95〜70重量部と、密度0.930〜0.965
ｇ／cm3メルトインデツクスが30ｇ／10min以下の
中低圧法ポリエチレン５〜30重量部とからなるポ
リエチレン組成物により成形された耐塩素水性ポ
リエチレン管。1 95 to 70 parts by weight of high-pressure polyethylene having a density of 0.935 to 0.910 g/cm 3 , a melt index of 1.0 g/10 min or less, and a ratio W / N of weight average molecular weight W to number average molecular weight N of 3 to 10; Density 0.930~0.965
A chlorine-resistant aqueous polyethylene pipe molded from a polyethylene composition comprising 5 to 30 parts by weight of medium-low pressure polyethylene having a g/ cm3 melt index of 30 g/10 min or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132792A JPS5757737A (en) | 1980-09-26 | 1980-09-26 | Chlorine water-resistant polyethylene pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55132792A JPS5757737A (en) | 1980-09-26 | 1980-09-26 | Chlorine water-resistant polyethylene pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5757737A JPS5757737A (en) | 1982-04-07 |
| JPS6329701B2 true JPS6329701B2 (en) | 1988-06-15 |
Family
ID=15089654
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55132792A Granted JPS5757737A (en) | 1980-09-26 | 1980-09-26 | Chlorine water-resistant polyethylene pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5757737A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5299885A (en) * | 1992-08-14 | 1994-04-05 | Aquapore Moisture Systems, Inc. | Stabilized porous pipe |
| US5631069A (en) * | 1994-05-09 | 1997-05-20 | The Dow Chemical Company | Medium modulus molded material comprising substantially linear polyethlene and fabrication method |
| US5518036A (en) * | 1994-09-29 | 1996-05-21 | Phillips Petroleum Company | Multi-layer plastic pipe and method and apparatus for extrusion thereof |
| JP2006029495A (en) * | 2004-07-20 | 2006-02-02 | Kvk Corp | Shower hose |
| US20060275571A1 (en) * | 2005-06-02 | 2006-12-07 | Mure Cliff R | Polyethylene pipes |
| JP5947241B2 (en) * | 2013-03-29 | 2016-07-06 | 大日精化工業株式会社 | Colored resin composition for water pipe and water pipe |
-
1980
- 1980-09-26 JP JP55132792A patent/JPS5757737A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5757737A (en) | 1982-04-07 |
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