JPS6261832B2 - - Google Patents
Info
- Publication number
- JPS6261832B2 JPS6261832B2 JP53156191A JP15619178A JPS6261832B2 JP S6261832 B2 JPS6261832 B2 JP S6261832B2 JP 53156191 A JP53156191 A JP 53156191A JP 15619178 A JP15619178 A JP 15619178A JP S6261832 B2 JPS6261832 B2 JP S6261832B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- pipe
- tube
- foam layer
- break
- 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
Landscapes
- Rigid Pipes And Flexible Pipes (AREA)
Description
本発明は金属管内にポリウレタン発泡体層を介
して合成樹脂層が設けられた複合管に関するもの
である。
従来、実開昭50−35877号公報または実開昭52
−118221号公報の如く、金属管と合成樹脂管との
間に軟質または硬質のポリウレタン樹脂の発泡体
を介在させた複合管が知られている。
しかし、軟質のポリウレタン樹脂の発泡体は通
常引張り強さ３Kg／cm2以下、破断時伸び100％以
上のもの、硬質のポリウレタン樹脂の発泡体は通
常引張り強さ30Kg／cm2以上破断時伸び10％以下の
ものであり、これをそれぞれ介在させた複合管に
加熱冷却を繰返すような流体を流したとき、前者
の場合は合成樹脂管の軸方向の収縮を必ずしも充
分に防止することができず、また後者の場合は金
属管と合成樹脂管とが部分的に剥離してしまい、
さらに、いずれの場合にも発泡体の独立気泡率が
高い場合は合成樹脂管が部分的に内方へ膨出して
しまい好ましくないという欠点があつた。
本発明は叙上の如き従来の欠点を解消すること
を目的としてなされたものであつて、その要旨
は、金属管内に合成樹脂管が挿入され、両管中に
0.2mm乃至２mmの肉厚を有するウレタン発泡体層
が設けられ、該ウレタン発泡体層により両管が固
着された複合管に於いて、前記発泡体層が引張り
強さ５Kg／cm2〜35Kg／cm2、破断時伸び30％〜130
％及び独立気泡率60％以下であることを特徴とす
る複合管に存する。
ここに独立気泡率とは発泡体中に含まれる全気
体量中にしめる発泡体中に閉じ込められている気
体量の割合をいい、次式により算出されるもので
ある。
独立気泡率＝ＶＸ−ＶＯ／Ｖ−ＶＯ×100（％）
ここにＶ：試料の見掛けの体積、VO；試料の
樹脂分の体積、VX；試料のベツクマン比重計に
よる測定体積である。
本発明における金属管としては、鋼管、ステン
レス管、銅管等一般に金属管と呼ばれるものが使
用でき、長さが１ｍ以上通常数ｍ乃至数拾ｍ、直
径が50mm以上通常100mm乃至1000mmのものが好適
に使用される。
本発明における合成樹脂管としては、例えば、
塩化ビニル樹脂管、ポリエチレン管、ポリプロピ
レン管、ポリアミド管等が使用されるが、その外
径は金属管中に挿入したとき金属管の内周面との
間隙が0.2乃至２mmとなるものであることが必要
である。
本発明におけるウレタン発泡体層成形用原液
（以下単に原液という）としては、接着主剤とし
てポリオール、接着硬化剤としてイソシアネー
ト、その他架橋剤、発泡剤、整泡剤及び硬化用触
媒からなる組成物が用いられる。
これらの各成分は所望の性質を有するよう適宜
組合せて用いられる。
ポリオールとしてはジオール、ポリエーテルま
たはポリエステル等が用いられ、イソシアネート
としては例えば、トリレンジイソシアネート、
４・4′−ジフエニルメタンジイソシアネート、ヘ
キサメチレンジイソシアネート等を用いることが
できる。
また、架橋剤としてはエチレングリコールや
１・４−ブタンジオールが好適に用いられ、発泡
剤としては、例えば、水、フレオン、炭化水素類
を用いることができ、整泡剤としては、例えば、
セルオープン性の高い整泡剤または汎用整泡剤に
オープンセル剤を混合したもの、好ましくはシリ
コン整泡剤が用いられる。
また、硬化用触媒としては、アミン系又は錫系
の各種触媒を用いることができる。
以下、本発明を実施例により図面を参照して説
明する。
１は薄肉鋼管等の金属管、２はポリ塩化ビニル
管等の合成樹脂管である。金属管１の内周面又は
合成樹脂管２の外周面に、接着主剤と接着硬化剤
を含み、該接着主剤100重量部に対して５〜30重
量部の架橋剤、１部以上の整泡剤及び発泡剤、硬
化用触媒が含まれてなる原液を金属管１と合成樹
脂管２との間隙の1/2以下になるように塗布し、
金属管１中に合成樹脂管２を挿入し、両管中で原
液を発泡硬化させ、両管中に引張り強さ５Kg／cm2
〜35Kg／cm2、破断時伸び30％〜130％及び独立気
泡率60％以下のウレタン発泡体層３を設け、ウレ
タン発泡体層３により両管が固着された複合管と
する。
本発明複合管において、ウレタン発泡体層３を
引張り強さ５Kg／cm2〜35Kg／cm2、破断時伸び30％
〜130％及び独立気泡率60％以下のものに限定す
る理由は、破断時伸びが30％〜130％のものであ
つても引張り強さが５Kg／cm2未満の場合、ウレタ
ン発泡体層が合成樹脂管の軸方向の収縮を防止す
る効果が充分でなく、又、引張り強さが35Kg／cm2
を越える場合、ウレタン発泡体層の厚みが0.2mm
〜２mmと肉薄であるので、破断時伸びが30％未満
となつてしまい、そのため加熱冷却が繰返された
とき、合成樹脂管の伸縮に追随できずに自ら破壊
してしまつて金属管と合成樹脂管とを剥離させて
しまうことになる。更に、引張り強さと破断時伸
びが前記の範囲を満足するものであつても、独立
気泡率が60％を越える場合、後述の比較例３乃至
比較例５で示される様に、ウレタン発泡体自身の
体積膨張を一定限度以下にコントロールすること
が難しく、このため合成樹脂管の内面に膨出部が
生じるためである。
しかして、叙上の如き本発明複合管中に加熱冷
却を繰返すような流体を流したとき、合成樹脂管
は軸方向に収縮せず、金属管と合成樹脂管との間
が剥離せず、合成樹脂管は内方向へ膨出しない。
これはウレタン発泡体層が引張り強さ５Kg／cm2〜
35Kg／cm2、且つ破断時伸び30％〜130％であるこ
とが、金属管と合成樹脂管との間を固着する接着
剤としての性能に関係し、加熱冷却が繰返された
とき、合成樹脂管の自由な収縮を許したり、合成
樹脂管の伸縮に追随できずに自ら破壊してしまつ
て金属管と合成樹脂管とを剥離させたりすること
がなく、且つ独立気泡率60％以下であることが加
熱時独立気泡中にとり込まれたガスや独立気泡中
に発生する炭酸ガスの膨張によるウレタン発泡体
自身の体積膨張を一定限度以下になるようにし、
その結果合成樹脂管を内方へ膨出させないものと
思われる。
実施例 １
金属管として外径114.3mm、内径105.3mm、長さ
４ｍの鋼管を用い、合成樹脂管として外径103.3
mm、内径95.3mm、長さ４ｍの硬質塩化ビニル樹脂
管を用いた。その結果、両管の間には、1.0mmの
間隙が存在することとなつた。接着用の原液とし
ては次のような組成（重量部）のものを用いた。
ジオール（OH値28） 100
エチレングリコール 15
トリエチレンジアミン 0.1
シリコン整泡剤 1.0
水 2.0
クルードMDI（NOCインデツクス105）
この原液は、これを自由発泡させると、約30倍
に発泡し、連続気泡の発泡体となつた。
樹脂管を回転させながら、上記原液を樹脂管外
面に、厚さ約0.5mmに均一に塗布しつつ、これを
前進させて金属管内に挿入した。挿入にあたつて
は、両管の間の間隙を一様に１mmに保つために、
樹脂管の外面に管軸方向に沿つて、直径１mm、長
さ30mmの硬質塩化ビニル樹脂製ロツドを当接し、
これを間隙保持材として使用した。こうして、樹
脂管を挿入後、金属管外面に70℃の熱風をあて
て、金属管を加熱した。その結果、原液は急速に
発泡し硬化し、発泡体層により両管が固着された
複合管が得られた。
この複合管の発泡体層は引張り強さ15.6Kg／
cm2、破断時伸び69.0％、独立気泡率33.1％であつ
た。
この複合管に１サイクル６分の割合で、85℃へ
の加熱と、約20℃への冷却とを繰返し、2000サイ
クル加熱冷却を繰り返し行つたが、この複合管は
合成樹脂管の軸方向の収縮、金属管と合成樹脂管
との間の剥離、及び合成樹脂管の内方への膨出は
みられなかつた。
以上の効果を表１において、数値をもつてより
具体的に表示する。
ここで、合成樹脂管収縮量とは叙上の加熱冷却
を繰り返した後に、４ｍの合成樹脂管が軸方向へ
収縮する長さであつて、単位はmmである。
また、剥離率とは叙上の加熱冷却を繰り返した
後に、金属管と合成樹脂管とが剥離した面積を比
率であらわしたものであつて、単位は％である。
すなわち、
The present invention relates to a composite pipe in which a synthetic resin layer is provided within a metal pipe via a polyurethane foam layer. Previously, Utility Model Application No. 50-35877 or Utility Model Application No. 52
As disclosed in Japanese Patent No. 118221, a composite pipe is known in which a soft or hard polyurethane resin foam is interposed between a metal pipe and a synthetic resin pipe. However, soft polyurethane resin foams usually have a tensile strength of 3 Kg/cm 2 or less and elongation at break of 100% or more, while hard polyurethane resin foams usually have a tensile strength of 30 Kg/cm 2 or more and an elongation at break of 10. % or less, and when a fluid that repeatedly heats and cools is flowed through a composite pipe that has these resins interposed, in the former case, it is not always possible to sufficiently prevent the synthetic resin pipe from shrinking in the axial direction. In the latter case, the metal pipe and synthetic resin pipe may partially separate,
Furthermore, in both cases, when the closed cell ratio of the foam is high, the synthetic resin tube partially bulges inward, which is undesirable. The present invention was made for the purpose of solving the conventional drawbacks as described above, and its gist is that a synthetic resin pipe is inserted into a metal pipe, and both pipes are inserted into a metal pipe.
In a composite pipe in which a urethane foam layer having a wall thickness of 0.2 mm to 2 mm is provided and both pipes are fixed by the urethane foam layer, the foam layer has a tensile strength of 5 Kg/cm 2 to 35 Kg/ cm2 , elongation at break 30%~130
% and a closed cell ratio of 60% or less. The closed cell ratio here refers to the ratio of the amount of gas trapped in the foam to the total amount of gas contained in the foam, and is calculated by the following formula. Closed cell ratio = VX - VO / V - VO x 100 (%) where V: apparent volume of the sample, VO: volume of resin component of the sample, VX: volume measured by a Beckman hydrometer. As the metal tube in the present invention, what is generally called a metal tube such as a steel tube, a stainless steel tube, or a copper tube can be used, and the length is 1 m or more, usually several meters to several tens of meters, and the diameter is 50 mm or more, usually 100 mm to 1000 mm. Preferably used. Examples of the synthetic resin pipe in the present invention include:
Vinyl chloride resin pipes, polyethylene pipes, polypropylene pipes, polyamide pipes, etc. are used, but their outer diameter must be such that when inserted into the metal pipe, there is a gap of 0.2 to 2 mm between the inner peripheral surface of the metal pipe and the pipe. is necessary. In the present invention, the urethane foam layer forming stock solution (hereinafter simply referred to as stock solution) is a composition consisting of a polyol as a main adhesive agent, an isocyanate as an adhesive curing agent, a crosslinking agent, a foaming agent, a foam stabilizer, and a curing catalyst. It will be done. These components are used in appropriate combinations so as to have desired properties. Diols, polyethers, polyesters, etc. are used as polyols, and examples of isocyanates include tolylene diisocyanate,
4,4'-diphenylmethane diisocyanate, hexamethylene diisocyanate, etc. can be used. Ethylene glycol and 1,4-butanediol are preferably used as crosslinking agents, water, freon, and hydrocarbons can be used as foaming agents, and foam stabilizers include, for example,
A foam stabilizer with high cell openness or a mixture of a general-purpose foam stabilizer and an open cell agent, preferably a silicone foam stabilizer, is used. Moreover, various amine-based or tin-based catalysts can be used as the curing catalyst. Hereinafter, the present invention will be explained by way of examples with reference to the drawings. 1 is a metal pipe such as a thin-walled steel pipe, and 2 is a synthetic resin pipe such as a polyvinyl chloride pipe. The inner circumferential surface of the metal tube 1 or the outer circumferential surface of the synthetic resin tube 2 contains a main adhesive agent and an adhesive curing agent, and 5 to 30 parts by weight of a crosslinking agent and 1 part or more of a foam stabilizer per 100 parts by weight of the main adhesive agent. Apply a stock solution containing a foaming agent, a foaming agent, and a curing catalyst so that the gap between the metal tube 1 and the synthetic resin tube 2 is less than 1/2,
Insert the synthetic resin tube 2 into the metal tube 1, foam and harden the stock solution in both tubes, and create a tensile strength of 5Kg/cm 2 in both tubes.
A urethane foam layer 3 having a weight of ~35 Kg/cm 2 , an elongation at break of 30% to 130%, and a closed cell ratio of 60% or less is provided to form a composite tube in which both tubes are fixed by the urethane foam layer 3. In the composite pipe of the present invention, the urethane foam layer 3 has a tensile strength of 5 Kg/cm 2 to 35 Kg/cm 2 and an elongation at break of 30%.
130% and a closed cell ratio of 60% or less is that even if the elongation at break is 30% to 130%, if the tensile strength is less than 5Kg/ cm2 , the urethane foam layer The effect of preventing the synthetic resin pipe from shrinking in the axial direction is not sufficient, and the tensile strength is 35Kg/cm 2
, the thickness of the urethane foam layer must be 0.2mm.
Since the wall is thin (~2mm), the elongation at break is less than 30%, so when heating and cooling are repeated, it cannot follow the expansion and contraction of the synthetic resin pipe and breaks itself, causing the metal pipe and synthetic resin to break. This will cause the tube to separate. Furthermore, even if the tensile strength and elongation at break satisfy the above ranges, if the closed cell ratio exceeds 60%, as shown in Comparative Examples 3 to 5 below, the urethane foam itself This is because it is difficult to control the volumetric expansion of the synthetic resin pipe to below a certain limit, and as a result, a bulge is formed on the inner surface of the synthetic resin pipe. Therefore, when a fluid that is repeatedly heated and cooled is passed through the composite tube of the present invention as described above, the synthetic resin tube does not shrink in the axial direction, and the metal tube and the synthetic resin tube do not separate. The synthetic resin pipe does not bulge inward.
This is because the urethane foam layer has a tensile strength of 5Kg/cm 2 ~
35Kg/cm 2 and elongation at break of 30% to 130% are related to the performance of the adhesive to bond between the metal pipe and the synthetic resin pipe, and when heating and cooling are repeated, the synthetic resin It does not allow free contraction of the tube, cannot follow the expansion and contraction of the synthetic resin tube and breaks itself, causing the metal tube and the synthetic resin tube to separate, and has a closed cell ratio of 60% or less. In other words, the volumetric expansion of the urethane foam itself due to the expansion of gas taken into the closed cells and carbon dioxide gas generated in the closed cells during heating is kept below a certain limit.
As a result, it seems that the synthetic resin pipe is not bulged inward. Example 1 A steel pipe with an outer diameter of 114.3 mm, an inner diameter of 105.3 mm, and a length of 4 m was used as the metal pipe, and an outer diameter of 103.3 mm was used as the synthetic resin pipe.
A hard vinyl chloride resin pipe with an inner diameter of 95.3 mm and a length of 4 m was used. As a result, there was a gap of 1.0 mm between the two tubes. The stock solution for adhesion had the following composition (parts by weight): Diol (OH value 28) 100 Ethylene glycol 15 Triethylenediamine 0.1 Silicone foam stabilizer 1.0 Water 2.0 Crude MDI (NOC index 105) When this stock solution is allowed to freely foam, it foams approximately 30 times more and forms an open-cell foam. It became. While rotating the resin tube, the stock solution was uniformly applied to the outer surface of the resin tube to a thickness of about 0.5 mm, and the tube was advanced and inserted into the metal tube. When inserting, in order to maintain a uniform gap of 1 mm between both tubes,
A hard vinyl chloride resin rod with a diameter of 1 mm and a length of 30 mm is brought into contact with the outer surface of the resin tube along the tube axis direction.
This was used as a gap retaining material. After inserting the resin tube in this way, hot air at 70°C was applied to the outer surface of the metal tube to heat the metal tube. As a result, the stock solution rapidly foamed and hardened, yielding a composite tube in which both tubes were fixed by the foam layer. The foam layer of this composite pipe has a tensile strength of 15.6Kg/
cm 2 , elongation at break was 69.0%, and closed cell ratio was 33.1%. This composite tube was repeatedly heated to 85℃ and cooled to approximately 20℃ at a rate of 6 minutes per cycle, and was repeatedly heated and cooled for 2000 cycles. No shrinkage, no separation between the metal tube and the synthetic resin tube, and no inward bulge of the synthetic resin tube were observed. The above effects are shown in Table 1 in more concrete terms using numerical values. Here, the synthetic resin pipe shrinkage amount is the length that a 4 m synthetic resin pipe shrinks in the axial direction after repeating the heating and cooling described above, and the unit is mm. Moreover, the peeling rate is expressed as a ratio of the area where the metal tube and the synthetic resin tube are peeled off after repeating the heating and cooling described above, and the unit is %. That is,
【表】
更に、膨出高さとは叙上の加熱冷却を繰り返し
た後に、合成樹脂管の内壁面が内方へ向かつて凸
状に膨出した突起の高さであつて、単位はcmであ
る。
以下同様に、実施例１に準じ、その原液の組成
のうち架橋剤、硬化性触媒または発泡剤を種々変
化させた実施例２及び実施例３、比較例１乃至比
較例５を表１に示す。
第２図は表１の結果を折れ線グラフで表示した
ものであつて、(a)は引張り強さと合成樹脂管収縮
量との関係を示し、(b)は破断時伸びと合成樹脂管
収縮量との関係を示し、(c)は引張り強さと剥離率
との関係を示し、(d)は破断時伸びと剥離率との関
係を示し、(e)は独立気泡率と膨出高さとの関係を
示すものである。[Table] Furthermore, the bulge height is the height of the protrusion that the inner wall surface of the synthetic resin pipe bulges out inward after repeated heating and cooling, and the unit is cm. be. Similarly, Table 1 shows Examples 2 and 3 and Comparative Examples 1 to 5, in which the crosslinking agent, curing catalyst, or blowing agent was variously changed in the composition of the stock solution according to Example 1. . Figure 2 shows the results of Table 1 in a line graph, where (a) shows the relationship between tensile strength and synthetic resin pipe shrinkage, and (b) shows the relationship between elongation at break and synthetic resin pipe shrinkage. (c) shows the relationship between tensile strength and peeling rate, (d) shows the relationship between elongation at break and peeling rate, and (e) shows the relationship between closed cell ratio and bulge height. It shows the relationship.
第１図は本発明の複合管の横断面図であり、第
２図は本発明の特徴であるところの引張り強さ、
破断時伸び及び独立気泡率と効果との関係を折れ
線で表示したグラフである。
１……金属管、２……合成樹脂管、３……発泡
体層。
FIG. 1 is a cross-sectional view of the composite pipe of the present invention, and FIG. 2 shows the tensile strength, which is a feature of the present invention.
It is a graph showing the relationship between elongation at break, closed cell ratio, and effectiveness using a polygonal line. 1... Metal pipe, 2... Synthetic resin pipe, 3... Foam layer.
【表】【table】
Claims (1)
0.2mm乃至２mmの肉厚を有するウレタン発泡体層
が設けられ、該ウレタン発泡体層により両管が固
着された複合管に於いて、前記発泡体層が引張り
強さ５Kg／cm2〜35Kg／cm2、破断時伸び30％〜130
％及び独立気泡率60％以下であることを特徴とす
る複合管。1 A synthetic resin pipe is inserted into a metal pipe, and both pipes are
In a composite pipe in which a urethane foam layer having a wall thickness of 0.2 mm to 2 mm is provided and both pipes are fixed by the urethane foam layer, the foam layer has a tensile strength of 5 Kg/cm 2 to 35 Kg/ cm2 , elongation at break 30%~130
% and a closed cell ratio of 60% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15619178A JPS5582883A (en) | 1978-12-15 | 1978-12-15 | Composite pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15619178A JPS5582883A (en) | 1978-12-15 | 1978-12-15 | Composite pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5582883A JPS5582883A (en) | 1980-06-21 |
| JPS6261832B2 true JPS6261832B2 (en) | 1987-12-23 |
Family
ID=15622351
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15619178A Granted JPS5582883A (en) | 1978-12-15 | 1978-12-15 | Composite pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5582883A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS602080U (en) * | 1983-06-20 | 1985-01-09 | 樽川 富次 | Fireproof composite pipe |
| EP1815918A1 (en) * | 2006-02-03 | 2007-08-08 | Uponor Innovation Ab | Making an elongated product |
-
1978
- 1978-12-15 JP JP15619178A patent/JPS5582883A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5582883A (en) | 1980-06-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3873407A (en) | Skin polyurethane foam | |
| JP6651441B2 (en) | Method for producing expanded thermoplastic elastomer particles | |
| US4627127A (en) | Cylindrical brush | |
| US3419455A (en) | Molded decorative article | |
| US3478134A (en) | Process for the manufacture of bowling pins | |
| JPS6261832B2 (en) | ||
| RU2743042C2 (en) | Method of manufacture of expanded thermoplastic polymers | |
| US4824873A (en) | Leather-wrapped steering wheel | |
| JPH11335435A (en) | Resin composition providing composite foam, composite foam, and method for producing the composite foam | |
| WO2017202782A1 (en) | Hollow particle made of thermoplastic elastomers and porous moulded bodies | |
| JP4755787B2 (en) | Method for producing foamed elastic roller | |
| JPH11310619A (en) | Polyurethane foam, method for producing the same, heat insulating material and heat insulating box | |
| JP4794300B2 (en) | Method for molding polyurethane foam | |
| JPS5949884B2 (en) | Manufacturing method of synthetic resin lined metal pipe | |
| JP4926462B2 (en) | Method for producing flexible polyurethane foam | |
| JP4979939B2 (en) | Method for producing polyurethane foam | |
| CA2058082A1 (en) | Polyolefin barrier films for preventing solvent attack on plastic resins | |
| JPS58101044A (en) | Grip with high-density hard shell | |
| JPS60147329A (en) | Method of reinforcing expanded protective body | |
| JPH06143443A (en) | Manufacturing method of composite pipe | |
| JP4948055B2 (en) | Polyurethane foam and method for producing the same | |
| JP4716702B2 (en) | OA roller manufacturing method | |
| JP4884025B2 (en) | Polyurethane foam containing foamable beads | |
| JPS631113B2 (en) | ||
| JP2002265559A (en) | Manufacturing method of porous polyurethane elastic body |