JPH03121149A - Flame-retardant resin composition - Google Patents
Flame-retardant resin compositionInfo
- Publication number
- JPH03121149A JPH03121149A JP25846289A JP25846289A JPH03121149A JP H03121149 A JPH03121149 A JP H03121149A JP 25846289 A JP25846289 A JP 25846289A JP 25846289 A JP25846289 A JP 25846289A JP H03121149 A JPH03121149 A JP H03121149A
- Authority
- JP
- Japan
- Prior art keywords
- flame
- ethylene
- weight
- retardant
- antioxidant
- 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.)
- Pending
Links
- 239000003063 flame retardant Substances 0.000 title claims abstract description 29
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 title claims abstract description 27
- 239000011342 resin composition Substances 0.000 title claims description 10
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 14
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 9
- 229920005601 base polymer Polymers 0.000 claims abstract description 7
- 150000003568 thioethers Chemical class 0.000 claims abstract description 5
- 239000004711 α-olefin Substances 0.000 claims abstract description 5
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 4
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 4
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 claims abstract description 3
- 125000004432 carbon atom Chemical group C* 0.000 claims description 5
- 229920001038 ethylene copolymer Polymers 0.000 claims description 5
- 229910052736 halogen Inorganic materials 0.000 claims description 4
- 150000002367 halogens Chemical class 0.000 claims description 4
- 239000002530 phenolic antioxidant Substances 0.000 claims description 2
- 229910052787 antimony Inorganic materials 0.000 claims 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 abstract description 11
- ADCOVFLJGNWWNZ-UHFFFAOYSA-N antimony trioxide Chemical compound O=[Sb]O[Sb]=O ADCOVFLJGNWWNZ-UHFFFAOYSA-N 0.000 abstract description 8
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 abstract description 5
- 229920001577 copolymer Polymers 0.000 abstract description 3
- 229920005989 resin Polymers 0.000 abstract description 3
- 239000011347 resin Substances 0.000 abstract description 3
- 239000004593 Epoxy Substances 0.000 abstract description 2
- 238000013329 compounding Methods 0.000 abstract 2
- QLZJUIZVJLSNDD-UHFFFAOYSA-N 2-(2-methylidenebutanoyloxy)ethyl 2-methylidenebutanoate Chemical compound CCC(=C)C(=O)OCCOC(=O)C(=C)CC QLZJUIZVJLSNDD-UHFFFAOYSA-N 0.000 abstract 1
- 229920000089 Cyclic olefin copolymer Polymers 0.000 abstract 1
- 239000005042 ethylene-ethyl acrylate Substances 0.000 abstract 1
- 238000003878 thermal aging Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 238000002156 mixing Methods 0.000 description 4
- 230000032683 aging Effects 0.000 description 3
- 239000000945 filler Substances 0.000 description 3
- 229920006125 amorphous polymer Polymers 0.000 description 2
- WHHGLZMJPXIBIX-UHFFFAOYSA-N decabromodiphenyl ether Chemical compound BrC1=C(Br)C(Br)=C(Br)C(Br)=C1OC1=C(Br)C(Br)=C(Br)C(Br)=C1Br WHHGLZMJPXIBIX-UHFFFAOYSA-N 0.000 description 2
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-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
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- UGQQAJOWXNCOPY-UHFFFAOYSA-N dechlorane plus Chemical compound C12CCC3C(C4(Cl)Cl)(Cl)C(Cl)=C(Cl)C4(Cl)C3CCC2C2(Cl)C(Cl)=C(Cl)C1(Cl)C2(Cl)Cl UGQQAJOWXNCOPY-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 229910000039 hydrogen halide Inorganic materials 0.000 description 1
- 239000012433 hydrogen halide Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、難燃性樹脂組成物の改良に係り、特に難燃剤
のブルームの発生がなく機械的強度に漬れる難燃性樹脂
組成物に関する。Detailed Description of the Invention (Field of Industrial Application) The present invention relates to the improvement of flame-retardant resin compositions, and particularly to flame-retardant resin compositions that do not cause blooming of flame retardants and have good mechanical strength. Regarding.
（従来の技術）
自動車のエンジン周辺部分やテレビ等のキャビネットな
どに用いられる機器電線の′ｔ＆覆材用の樹脂組成物は
、高い耐熱性と難燃性が要求されている。従来より耐熱
性に優れる組成物として高密度ポリエチレン等が知られ
ているが、これに難燃剤を添加したものは経時的に難燃
剤が組成物表面にしみだしてくるいわゆるブルームを生
じてしまうという問題があった。一方、エチレン−アク
リル酸エチルコポリマー（ＥＬ、Ａ＞等のアモルファス
なポリマーは難燃剤を添加してもブルームは生じない反
面、耐熱性、＠械的特性に非常に劣るという問題があっ
た。また、これらを適宜組み合わせて配合したものなど
が種々検討されているがその特性はいまだ不十分であり
、耐熱性と難燃性の両方の特性を兼ね備え、機械的特性
が良好でかつブルームを生じないという諸性性を同時に
満たす組成物が強く要求されている。(Prior Art) High heat resistance and flame retardance are required of resin compositions for covering materials for equipment electric wires used in areas around automobile engines, cabinets for televisions, and the like. High-density polyethylene has traditionally been known as a composition with excellent heat resistance, but when a flame retardant is added to it, the problem is that over time, the flame retardant oozes out onto the surface of the composition, causing so-called bloom. was there. On the other hand, amorphous polymers such as ethylene-ethyl acrylate copolymers (EL, A) do not cause blooming even when flame retardants are added, but they have the problem of being extremely poor in heat resistance and mechanical properties. Various formulations have been studied, including appropriate combinations of these, but their properties are still insufficient.They have both heat resistance and flame retardancy, good mechanical properties, and do not cause blooming. There is a strong demand for a composition that simultaneously satisfies these properties.
〈発明が解決しようとする課題）
以上の点に鑑みて、本発明は耐熱性と難燃性を兼ね備え
１機械的特性が良好でかつ難燃剤のブルームを生じない
緒特性を同時に満たす難燃性樹脂組成物を提供すること
を目的とする。(Problems to be Solved by the Invention) In view of the above points, the present invention provides a flame retardant that has both heat resistance and flame retardancy, and has good mechanical properties and does not cause flame retardant bloom. The purpose is to provide a resin composition.
（課題を解決するための手段）
本発明は即ち、（イ）α−オレフィンの炭素数が６以上
のα−オレフィン−エチレン共重合体６０〜９０重量％
と（ロ）ＬＥＡおよび／またはエチレン−酢酸ビニル共
重合体（ＥＶＡ）１０〜４０重及％と重重なるベースポ
リマ−１ｏｏｔｉｔ部に、（ハ）ハロゲン系難燃剤２０
〜１００重量部と、（ニ）三酸化アンチモン８〜６０重
量部と、（ポ）ヒンダードフェノール系酸化防ｄ：剤お
よびチオエーテル系酸化防止剤をそれぞれ２〜１５盾星
部配合してなること１ｔ？徴とする難燃性ｖ１１脂組成
物に関する。(Means for Solving the Problems) The present invention includes (a) 60 to 90% by weight of an α-olefin-ethylene copolymer in which the α-olefin has 6 or more carbon atoms;
and (b) 10 to 40% by weight of the base polymer overlapping with LEA and/or ethylene-vinyl acetate copolymer (EVA), (c) halogenated flame retardant 20
~100 parts by weight, (d) 8 to 60 parts by weight of antimony trioxide, and (p) 2 to 15 parts of each of a hindered phenolic antioxidant d: agent and a thioether antioxidant. 1t? The present invention relates to a flame-retardant V11 fat composition having the following characteristics.
本発明においては、ベースポリマーとして１ｇ性および
機械的強度の高い上記（イ）と、難燃剤のブルームを生
じないアモルファスなポリマーである（口）を併用して
いるので、良好な耐熱性を有しながらかつブルームを防
止することができる。In the present invention, as the base polymer, (a), which has high 1g property and mechanical strength, is used in combination with (a), which is an amorphous polymer that does not cause flame retardant bloom, it has good heat resistance. At the same time, bloom can be prevented.
また充填剤として上記（ハ）および（ニ）の難燃剤と特
定の（ポ）の酸化防止剤を選択しているので比較的少な
い添加址で充分な難燃性、耐熱老化性を付与することが
でき、組成物のｖ１械的強度を損なわない、また、本発
明においては上記（イ）〜（ホ）の各成分を組み合わせ
て所定量配合することにより上述の緒特性を同時に満足
することができる。In addition, since the above flame retardants (c) and (d) and the specific antioxidant (p) are selected as fillers, sufficient flame retardancy and heat aging resistance can be imparted with a relatively small amount of addition. In addition, in the present invention, the above-mentioned characteristics can be simultaneously satisfied by combining and blending each of the components (a) to (e) in a predetermined amount. can.
本発明における（インα−オレフィンの炭素数が６以上
のα−オレフィン−エチレン共重合体としては、直頒ヘ
キセン（炭素数６）−エチレン共重合体を初めとする共
重合体があり、これらは単独あるいは混合して使用する
ことができる。炭素数が５以下のα−オレフィンによる
α−オレフィンーエヂレン共重合体、例えばエチレン−
プロピレン共重合体等を用いると、組成物の機械的特性
、耐熱性が著しく低ドする。In the present invention, the α-olefin-ethylene copolymer in which the α-olefin has 6 or more carbon atoms includes copolymers including direct hexene (6 carbon atoms)-ethylene copolymers. can be used alone or in combination.α-olefin-ethylene copolymers of α-olefins having 5 or less carbon atoms, such as ethylene-
If a propylene copolymer or the like is used, the mechanical properties and heat resistance of the composition will be significantly lowered.
本発明における（口）ＥＥΔおよび／またはＩＥＶＡは
、ｆｉ燃剤のブルーム防止の効果からエチレン含有量が
５〜５０重量％のものがより好ましい。In the present invention, EEΔ and/or IEVA more preferably have an ethylene content of 5 to 50% by weight from the viewpoint of preventing blooming of fi fuel.
上記（イ）と（ロ）の混合割合は、（イ）が６０〜９Ｏ
ｆｆｉ殖％であり、６０重量％より少ないと１１戒物の
耐熱性が低下し、９０重量％より多いと難燃剤のブルー
ムを生じる。The mixing ratio of (a) and (b) above is (a) is 60 to 90
If it is less than 60% by weight, the heat resistance of the 11 precepts will decrease, and if it is more than 90% by weight, the flame retardant will bloom.
本発明においては、（イ）と（ロ）の混合樹脂よりなる
ベースポリマー１００重重部に対して、難燃剤および難
燃助剤として（ハ）ハロゲン系難燃剤２０〜１００重量
部と、（ニ）三酸化アンチモン８〜６０重量部とを添加
する。（ハ）ハロゲン系難燃剤としては、デカブロモジ
フェニルエーテル（Ｄ Ｂ Ｄ Ｐ Ｅ ）や、塩素系
難燃剤（＠えば商品名デクロランプラス２５）等が好適
する。また、（ハ）と（ニ）の配合吐が上記範囲より少
ないと難燃性が不十分となり、またこの範囲より多いと
組成物のｖ！Ａ械的強度が低下するとともにブルームを
生ずることがある。In the present invention, 20 to 100 parts by weight of a halogen-based flame retardant (c) as a flame retardant and a flame retardant aid are added to 100 parts by weight of a base polymer made of a mixed resin of (a) and (b) ) 8 to 60 parts by weight of antimony trioxide are added. (c) As the halogen flame retardant, decabromodiphenyl ether (DBDPE), chlorine flame retardant (trade name: Dechlorane Plus 25), etc. are suitable. Further, if the amount of (c) and (d) is less than the above range, the flame retardancy will be insufficient, and if it is more than this range, the composition will have v! A: Mechanical strength may decrease and bloom may occur.
本発明においては、酸化１１７７止剤として（ホ）ヒン
ダードフェノール系酸化防止剤およびチオエーテル系酸
化防止剤を併用することを特徴とする。The present invention is characterized in that (e) a hindered phenol antioxidant and a thioether antioxidant are used together as the 1177 oxidation inhibitor.
この２種の酸化防止剤を併用することにより組成物の熱
老化特性および難燃性をより向上させることができ、こ
れ以外の例えばフェノール系、エポキシ系等の酸化防止
剤の併用は望ましくない、また、上記（ホ）の配合割合
はベースポリマー１００重量部に対して、ヒンダードフ
ェノール系およびチオエーテル系をそれぞれ２〜１５重
址部であり、これより少ないと組成物の耐熱性、熱老化
特性の向上が小さく、またこれより多くしても難燃性の
向とが望めない。By using these two types of antioxidants in combination, the heat aging characteristics and flame retardance of the composition can be further improved, and it is not desirable to use other antioxidants, such as phenol-based and epoxy-based antioxidants, in combination. In addition, the blending ratio of the above (e) is 2 to 15 parts by weight of each of the hindered phenol type and the thioether type to 100 parts by weight of the base polymer, and if it is less than this, the heat resistance and heat aging characteristics of the composition The improvement in flame retardancy is small, and even if the amount is increased beyond this value, no improvement in flame retardancy can be expected.
なお、本発明においては上述の各成分のほかに非ハロゲ
ン系難燃剤やその他の充填剤を適宜添加することができ
る。このような充填剤を添加する場合には、得られる組
成物の機械的特性やブルーム現象の防止などから、ベー
スポリマー１００重重部に対して２００重景都合越えな
いことが望ましい。In addition, in the present invention, in addition to the above-mentioned components, a non-halogen flame retardant and other fillers may be appropriately added. When such a filler is added, it is desirable not to exceed 200 parts by weight per 100 parts by weight of the base polymer, in view of the mechanical properties of the resulting composition and prevention of blooming.
本発明の難燃性樹脂組成物は、上述の各成分を所定量混
合することにより得られるが、必要に応じて常法により
架橋しても良い。The flame-retardant resin composition of the present invention can be obtained by mixing predetermined amounts of each of the above-mentioned components, but it may be crosslinked by a conventional method if necessary.
（実施例） 本発明の実施例について説明する。(Example) Examples of the present invention will be described.
実施例１〜２
表に示す割合で各成分を配合し、充分混練して難燃性樹
脂組成物を製造した。これを用いて次の試験をＬ ｆ、
： 、 ｎ Ｍ 的特性ハ、ＪＩＳ Ｋ ７１１３
に準じてダンベル２号の試験片を用いて１００％モジＪ
、ラス、引っ張り強さ（”「ｓ）、伸び（Ｅｂ）を測定
した。また耐熱性はＵＬ−９４規格に準じてＵｌ−オー
ブンにて１８０℃×１０口間加熱後の引っ張り強さ残率
（Ｔｓ残串）、伸び強さ残率（Ｅｂ残串）を測定した。Examples 1-2 Each component was blended in the proportions shown in the table and sufficiently kneaded to produce a flame-retardant resin composition. Using this, the next test is L f,
: , n M characteristics C, JIS K 7113
100% Moji J using a dumbbell No. 2 test piece according to
, lath, tensile strength (s), and elongation (Eb) were measured. Heat resistance was determined by the tensile strength remaining after heating for 10 times at 180°C in an UL-oven in accordance with the UL-94 standard. (Ts residual skewer) and elongation strength retention (Eb residual skewer) were measured.
難燃性は、ｕ １．−９４規格試験を行った。またこれ
らの試験を行った試験片を３０日間放７ｉ後のブルーム
の有無を調べた。結果を表に示す。Flame retardancy is u1. -94 standard test was conducted. In addition, the presence or absence of bloom was examined after the test pieces subjected to these tests were left exposed for 30 days. The results are shown in the table.
比較例１〜１１
ぺに示す割合で各成分を配合し、その他は実施例１と同
様にして製造および試験をした。結果を表に示す。Comparative Examples 1 to 11 The components were blended in the proportions shown in Figure 1, and the manufacturing and testing were otherwise carried out in the same manner as in Example 1. The results are shown in the table.
（以下余白）
人に示されるように１本発明の難燃性樹脂組成物は、水
和金属化合物と赤リンをＯＦ用した場合と同等の難燃性
、機械的特性を有しながら、がっ有’＋！Ｆガスを発生
ずることがない、また、上記（イ）、（ロ）、および（
ハ〉からなる群の中から少なくとも２種をｆｉＦ用して
配合しているので、これらを１１独で配合した場合に比
して難燃性が大幅に向」ニしている。(Left below) As shown in the figure, the flame-retardant resin composition of the present invention has flame retardancy and mechanical properties equivalent to those obtained when a hydrated metal compound and red phosphorus are used as OF, but There's +! It does not generate F gas, and the above (a), (b), and (
Since at least two types from the group consisting of (c) are blended for fiF, the flame retardance is significantly improved compared to a case where only 11 of these are blended.
（発明の効果）
以Ｅ本発明の難燃性樹脂組成物は、機械的特性を良好に
保ちながら、難燃性を大幅に向上し２また燃焼時にハロ
ゲン化水素ガス、ボスフィンガスなどの有害ガスを発生
しないので極めて安全であり幅広い用途に提供できるも
のである。(Effects of the Invention) The flame-retardant resin composition of the present invention greatly improves flame retardancy while maintaining good mechanical properties, and also eliminates harmful gases such as hydrogen halide gas and Bosphin gas during combustion. Since it does not generate gas, it is extremely safe and can be used in a wide range of applications.
Claims (1)
レフィン−エチレン共重合体６０〜９０重量％と（ロ）
エチレン−アクリル酸エチルコポリマーおよび／または
エチレン−酢酸ビニル共重合体１０〜４０重量％とから
なるベースポリマー１００重量部に、（ハ）ハロゲン系
難燃剤２０〜１００重量部と、（ニ）三酸化アンチモン
８〜６０重量部と、（ホ）ヒンダードフェノール系酸化
防止剤およびチオエーテル系酸化防止剤をそれぞれ２〜
１５重量部配合してなることを特徴とする難燃性樹脂組
成物。(1) (a) 60 to 90% by weight of an α-olefin-ethylene copolymer in which the α-olefin has 6 or more carbon atoms; and (b)
To 100 parts by weight of a base polymer consisting of 10 to 40% by weight of ethylene-ethyl acrylate copolymer and/or ethylene-vinyl acetate copolymer, (c) 20 to 100 parts by weight of a halogen flame retardant, and (d) trioxide. 8 to 60 parts by weight of antimony, and 2 to 2 parts each of (e) a hindered phenolic antioxidant and a thioether antioxidant.
A flame-retardant resin composition comprising 15 parts by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25846289A JPH03121149A (en) | 1989-10-03 | 1989-10-03 | Flame-retardant resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25846289A JPH03121149A (en) | 1989-10-03 | 1989-10-03 | Flame-retardant resin composition |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03121149A true JPH03121149A (en) | 1991-05-23 |
Family
ID=17320565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25846289A Pending JPH03121149A (en) | 1989-10-03 | 1989-10-03 | Flame-retardant resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03121149A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005092975A1 (en) * | 2004-03-25 | 2005-10-06 | Mitsui Chemicals, Inc. | Flame-retardant ethylene resin composition and use thereof |
| CN104262764A (en) * | 2014-08-21 | 2015-01-07 | 江苏华侃核电器材科技有限公司 | Pyrocondensation insulation material used for nuclear power plant of the third generation and preparing method thereof |
-
1989
- 1989-10-03 JP JP25846289A patent/JPH03121149A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2005092975A1 (en) * | 2004-03-25 | 2005-10-06 | Mitsui Chemicals, Inc. | Flame-retardant ethylene resin composition and use thereof |
| JPWO2005092975A1 (en) * | 2004-03-25 | 2008-02-14 | 三井化学株式会社 | Flame retardant ethylene resin composition and use thereof |
| KR100807764B1 (en) * | 2004-03-25 | 2008-02-28 | 미쓰이 가가쿠 가부시키가이샤 | Flame-retardant ethylene resin composition and use thereof |
| JP4790606B2 (en) * | 2004-03-25 | 2011-10-12 | 三井化学株式会社 | Flame retardant ethylene resin composition and use thereof |
| CN104262764A (en) * | 2014-08-21 | 2015-01-07 | 江苏华侃核电器材科技有限公司 | Pyrocondensation insulation material used for nuclear power plant of the third generation and preparing method thereof |
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