JP2796096B2 - Flame retardant wires and cables - Google Patents
Flame retardant wires and cablesInfo
- Publication number
- JP2796096B2 JP2796096B2 JP63164368A JP16436888A JP2796096B2 JP 2796096 B2 JP2796096 B2 JP 2796096B2 JP 63164368 A JP63164368 A JP 63164368A JP 16436888 A JP16436888 A JP 16436888A JP 2796096 B2 JP2796096 B2 JP 2796096B2
- Authority
- JP
- Japan
- Prior art keywords
- flame
- retardant
- water
- cables
- halogen
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、優れた難燃性を発揮するとともに外観も
良好な難燃性電線および難燃性ケーブルに関する。Description: TECHNICAL FIELD The present invention relates to a flame-retardant electric wire and a flame-retardant cable which exhibit excellent flame retardancy and also have a good appearance.
電線・ケーブルを難燃化するには、一般にその最外層
に難燃性混和物からなる難燃性被覆を設けることによっ
て行われている。そして、ここで用いられる難燃性混和
物は大別するとハロゲン系と非ハロゲン系とに分けるこ
とができる。Generally, in order to make electric wires and cables flame-retardant, a flame-retardant coating made of a flame-retardant admixture is provided on the outermost layer. The flame-retardant admixture used here can be roughly classified into a halogen-based compound and a non-halogen-based compound.
ハロゲン系の混和物を用いたものでは、火災にあうと
有害なハロゲンガスを放出し、これが人体に有害である
のみならず、機器を腐食するなどの火災に伴う二次災害
が起き易いところから、非ハロゲン系の混和物が好まし
いものとして今日では多く使用されている。Halogen-based compounds emit harmful halogen gas when fire occurs, which is not only harmful to the human body, but also secondary fire-related disasters such as corrosion of equipment. Today, non-halogen based admixtures are frequently used as preferred.
ところで、非ハロゲン系の難燃性混和物としては、特
開昭51−46341号広報に見られるように難燃剤として水
酸化アルミニウム、水酸化マグネシウムまたは水酸化マ
グネシウムと炭酸マグネシウムの複合体をポリオレフィ
ン系ポリマーなどのハロゲンを含まない合成樹脂に添加
した混和物が知られている。Incidentally, as the non-halogen flame-retardant admixture, aluminum hydroxide, magnesium hydroxide or a composite of magnesium hydroxide and magnesium carbonate is used as a flame retardant as a polyolefin-based flame retardant as seen in Japanese Patent Application Laid-Open No. Sho 51-46341. Mixtures added to halogen-free synthetic resins such as polymers are known.
しかしながら、このような水酸アルミニウムを添加し
た混和物を使用するものでは、電線、ケーブルの外被と
して抽出被覆するときに発泡を起し易いという不都合が
あり、実用面で問題がある。However, the use of such an admixture to which aluminum hydroxide is added is disadvantageous in that foaming is apt to occur when the material is extracted and coated as a sheath of an electric wire or a cable, and there is a problem in practical use.
一方、水酸化マグネシウムは水酸化アルミニウムより
も発泡性が少なく加工上の問題が少ないので、好ましい
難燃剤であるが、これを用いて製造した難燃性電線やケ
ーブルを洞道などの湿度の高い雰囲気に敷設すると電
線、ケーブルの表面が白化してくる。このため、品質面
での不安感を与えることのないように白化の発生を防止
することが望まれている。On the other hand, magnesium hydroxide is a preferred flame retardant because it has less foaming properties and less processing problems than aluminum hydroxide, but flame-retardant wires and cables manufactured using this are used in high-humidity areas such as caves. When laid in an atmosphere, the surfaces of electric wires and cables become white. Therefore, it is desired to prevent the occurrence of whitening so as not to give a sense of uneasiness in quality.
この発明では、水に対する溶解度（15℃における）が
0.1g以下の撥水処理された炭酸水素ナトリウム（重曹）
を難燃剤として用い、これをポリオレフィン系ポリマー
に配合した難燃性混和物からなる難燃性被覆を設けるこ
とをその解決手段とした。In the present invention, the solubility in water (at 15 ° C.)
0.1 g or less of water-repellent sodium hydrogen carbonate (baking soda)
Was used as a flame retardant, and a means for solving the problem was to provide a flame-retardant coating made of a flame-retardant admixture in which this was blended with a polyolefin-based polymer.
炭酸水素ナトリウム（NaHCO3）は、その熱分解温度が
約300℃であり、このため押出被覆時の発泡が抑制され
る。また、高湿度下においてもケーブル表面が白化する
ことがない。さらに、撥水処理されていることから、水
に対して難溶性となり、難燃性被覆から溶出することが
ない。Sodium bicarbonate (NaHCO 3 ) has a thermal decomposition temperature of about 300 ° C., which suppresses foaming during extrusion coating. In addition, even under high humidity, the cable surface does not whiten. Furthermore, since it is water-repellent, it becomes hardly soluble in water and does not elute from the flame-retardant coating.
第１図はこの発明の難燃性電線の一例を示すもので、
図中符号１は難燃性電線である。この難燃性電線１は、
銅、アルミニウムなどからなる導体２上に、ポリエチレ
ン、架橋ポリエチレン、エチレンプロピレンゴムなどの
ハロゲンを含まない樹脂からなる絶縁体３を設け、この
絶縁体３上にポリオレフィン系ポリマーに撥水処理炭酸
水素ナトリウムを配合した難燃性混和物からなる難燃層
４を設けてなるものである。FIG. 1 shows an example of the flame-retardant electric wire of the present invention.
Reference numeral 1 in the figure denotes a flame-retardant electric wire. This flame-retardant electric wire 1
An insulator 3 made of a resin containing no halogen, such as polyethylene, cross-linked polyethylene, or ethylene propylene rubber, is provided on a conductor 2 made of copper, aluminum, or the like. And a flame-retardant layer 4 made of a flame-retardant admixture containing
ここで使用される撥水処理炭酸水素ナトリウムとは、
粉末状の炭酸水素ナトリウムをシリコーン系撥水処理剤
などの撥水処理剤で処理したものであり、炭酸水素ナト
リウム粉末100重量部を撹拌しつつ液状のシリコーン系
撥水処理剤を１〜30重量部滴下し、十分撹拌混合して、
炭酸水素ナトリウム粉末粒子の表面にシリコーン系撥水
処理剤の薄い被覆を形成する方法などによって得ること
ができる。この撥水処理によって、炭酸水素ナトリウム
の水に対する溶解度は8.8g（15℃）から、0.1g以下に減
少し、難溶性となる。The water-repellent treated sodium bicarbonate used here is
Powdered sodium bicarbonate is treated with a water-repellent agent such as a silicone water-repellent agent, and 100 parts by weight of sodium hydrogencarbonate powder is stirred with a liquid silicone-based water-repellent agent in an amount of 1 to 30 parts by weight. Drop, and mix well with stirring.
It can be obtained by, for example, a method of forming a thin coating of a silicone-based water repellent on the surface of sodium hydrogen carbonate powder particles. By this water-repellent treatment, the solubility of sodium bicarbonate in water is reduced from 8.8 g (15 ° C.) to 0.1 g or less, making it less soluble.
また、この撥水処理炭酸水素ナトリウムが配合される
樹脂組成物としては、ハロゲンを含まないポリオレフィ
ン系ポリマーを主体とするものが用いられ、このハロゲ
ンを含まないポリオレフィン系ポリマーとしては、高密
度ポリエチレン、低密度ポリエチレン、ポリプロピレ
ン、ポリブテン−１やエチレン−酢酸ビニル共重合体
（EVA）、エチレン−エチルアクリレート共重合体（EE
A）、エチレン−プロピレン共重合体、エチレン−ブテ
ン−１共重合体、エチレン−ヘキセン−１共重合体など
のエチレンと他のモノマーとの共重合体が用いられる。As the resin composition to which the water-repellent treated sodium hydrogen carbonate is blended, a resin composition mainly containing a halogen-free polyolefin-based polymer is used. Examples of the halogen-free polyolefin-based polymer include high-density polyethylene, Low density polyethylene, polypropylene, polybutene-1, ethylene-vinyl acetate copolymer (EVA), ethylene-ethyl acrylate copolymer (EE
A), a copolymer of ethylene and another monomer such as an ethylene-propylene copolymer, an ethylene-butene-1 copolymer, and an ethylene-hexene-1 copolymer is used.
撥水処理炭酸水素ナトリウムの配合量は前記樹脂組成
物100重量部に対して10〜150重量部程度とされる。撥水
処理炭酸水素ナトリウムが10重量部未満では十分な難燃
性が得られず、150重量部を越えると混和物の機械的特
性等が低下して不都合となる。The amount of the water-repellent treated sodium hydrogen carbonate is about 10 to 150 parts by weight based on 100 parts by weight of the resin composition. If the water-repellent treated sodium bicarbonate is less than 10 parts by weight, sufficient flame retardancy cannot be obtained, and if it exceeds 150 parts by weight, the mechanical properties of the admixture are reduced, which is disadvantageous.
また、必要に応じて、水酸化アルミニウム、水酸化マ
グネシウムを添加して難燃性をより高めることもできる
が、押出被覆時の発泡および高湿下での白化が生じるた
め、その配合量は少ない方が望ましく、樹脂組成物100
重量部に対してそれぞれ20重量部以下とすることが好ま
しい。In addition, if necessary, aluminum hydroxide and magnesium hydroxide can be added to further increase the flame retardancy, but since the foaming at the time of extrusion coating and whitening under high humidity occur, the blending amount is small. Is more desirable, the resin composition 100
It is preferable that the content is 20 parts by weight or less for each part by weight.
断面積24mm2の導体上に架橋ポリエチレンからなる厚
さ3mmの絶縁体を設け、この絶縁体上に第１表を示す配
合組成の難燃性被覆（厚さ2mm）を押出被覆して、この
発明の難燃性電線を得た。この難燃性電線について、酸
素指数、難燃性被覆の白化性および発泡性を検討した。A 3 mm thick insulator made of cross-linked polyethylene was provided on a conductor having a cross-sectional area of 24 mm 2 , and a flame-retardant coating (2 mm thick) having the composition shown in Table 1 was extrusion-coated on the insulator. The flame-retardant electric wire of the invention was obtained. With respect to this flame-retardant electric wire, the oxygen index, the whitening property and the foaming property of the flame-retardant coating were examined.
難燃性被覆の白化性は、電線を温度80℃、相対温度90
％の条件下で７日間放置し、難燃性被覆の表面に白化が
認められないものを○とし、白化が認められたものを×
とした。The whiteness of the flame-retardant coating is based on the fact that the wire has a temperature of 80 ° C and a relative temperature of 90 ° C.
% For 7 days. When the surface of the flame-retardant coating did not show whitening, it was evaluated as ○, and when whitening was observed, ×.
And
また、難燃性被覆の発泡性は、難燃性被覆をある温度
で10分間放置し、発泡が認められた温度の最低温度で表
わした。よって、この温度が高い程押出被覆時の発泡の
可能性が減少する。The foaming property of the flame-retardant coating was represented by the lowest temperature at which foaming was observed after the flame-retardant coating was left at a certain temperature for 10 minutes. Thus, the higher the temperature, the less the possibility of foaming during extrusion coating.
結果を第１表に併せて示す。 The results are shown in Table 1.
第１表から明らかなように、撥水処理炭酸水素ナトリ
ウムは良好な難燃性を付与するとともに白化、発泡がな
く、良好な難燃剤であることがわかる。As is evident from Table 1, the water-repellent treated sodium hydrogen carbonate imparts good flame retardancy, does not cause whitening and foaming, and is a good flame retardant.
以上説明したように、この発明の難燃性電線・ケーブ
ルは、ポリオレフィン系ポリマーに水に対する溶解度
（15℃における）が0.1g以下の撥水処理炭酸水素ナトリ
ウムを配合してなるものであるので、高い燃燃性を発揮
するとともに難燃性被覆の押出成形時における発泡現象
がなく、さらに高温高湿下に敷設しても難燃性被覆の表
面が白化することがない。さらに、非ハロゲン系となる
ので、火災時に有害なハロゲンガスを発生することもな
い。また、撥水処理炭酸水素ナトリウムが難燃性被覆か
ら溶出することがなく、電線・ケーブルの難燃性が供用
中に低下することもない。As described above, the flame-retardant electric wire / cable of the present invention is obtained by mixing a polyolefin-based polymer with water-repellent treated sodium hydrogencarbonate having a solubility in water (at 15 ° C.) of 0.1 g or less. It exhibits high flammability and does not have a foaming phenomenon during extrusion molding of the flame-retardant coating, and does not whiten the surface of the flame-retardant coating even when laid under high temperature and high humidity. Further, since it is non-halogen, no harmful halogen gas is generated during a fire. In addition, the water-repellent treated sodium hydrogen carbonate does not elute from the flame-retardant coating, and the flame retardancy of the electric wire / cable does not decrease during operation.
第１図はこの発明の難燃性電線電線の一例を示す断面図
である。 ４……難燃層。FIG. 1 is a sectional view showing an example of a flame-retardant electric wire according to the present invention. 4 ... flame retardant layer.
フロントページの続き (56)参考文献 特開 昭63−43207（ＪＰ，Ａ) 特開 昭52−30853（ＪＰ，Ａ) 特開 昭63−284263（ＪＰ，Ａ) 特開 昭53−110639（ＪＰ，Ａ) 実開 昭63−127023（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) H01B 7/34 H01B 3/44Continuation of the front page (56) References JP-A-63-43207 (JP, A) JP-A-52-30853 (JP, A) JP-A-63-284263 (JP, A) JP-A-53-110639 (JP, A) , A) Real opening 63-127023 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) H01B 7/34 H01B 3/44
Claims (1)
溶解度（15℃における）が0.1g以下の撥水処理炭酸水素
ナトリウムを配合してなる難燃性被覆が設けられたこと
を特徴とする難燃性電線・ケーブル。1. A flame-retardant coating comprising a polyolefin-based polymer and a water-repellent treated sodium hydrogen carbonate having a solubility in water (at 15 ° C.) of 0.1 g or less is provided. Electric wires and cables.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63164368A JP2796096B2 (en) | 1988-07-01 | 1988-07-01 | Flame retardant wires and cables |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63164368A JP2796096B2 (en) | 1988-07-01 | 1988-07-01 | Flame retardant wires and cables |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0215511A JPH0215511A (en) | 1990-01-19 |
| JP2796096B2 true JP2796096B2 (en) | 1998-09-10 |
Family
ID=15791815
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63164368A Expired - Fee Related JP2796096B2 (en) | 1988-07-01 | 1988-07-01 | Flame retardant wires and cables |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2796096B2 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2971240B2 (en) * | 1992-03-24 | 1999-11-02 | 東レ・ダウコーニング・シリコーン株式会社 | Method for producing water-repellent molded body |
| CN111192716B (en) * | 2020-01-06 | 2021-09-14 | 浙江中大元通特种电缆有限公司 | Flame-retardant cable for underground coal mine |
| WO2021187522A1 (en) | 2020-03-17 | 2021-09-23 | ダウ・東レ株式会社 | Cement composition and cured product thereof |
| US20230146623A1 (en) | 2020-03-17 | 2023-05-11 | Dow Toray Co., Ltd. | Precast concrete molded body |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5230853A (en) * | 1975-09-03 | 1977-03-08 | Takashi Ishikawa | Flame-retardant synthetic resin |
| JPS6343207A (en) * | 1986-08-08 | 1988-02-24 | 日立電線株式会社 | Flame resisting electrically insulating composition |
-
1988
- 1988-07-01 JP JP63164368A patent/JP2796096B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0215511A (en) | 1990-01-19 |
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