JP7048701B2 - 熱膨張性耐火樹脂組成物 - Google Patents
熱膨張性耐火樹脂組成物 Download PDFInfo
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Description
本願は、2014年8月27日に出願した特願2014-173016号明細書の優先権の利益を主張するものであり、当該明細書はその全体が参照により本明細書中に援用される。
(技術分野)
本発明は、熱膨張性耐火樹脂組成物に関する。
項1.樹脂成分100重量部、熱膨張性黒鉛3~300重量部、及び無機充填材2~200重量部を含有し、熱膨張性黒鉛の平均アスペクト比が20以上であることを特徴とする熱膨張性耐火樹脂組成物。
項2.熱膨張性黒鉛の平均粒径が100~1000μmの範囲にあり、かつ平均厚さが50μm以下である、項1に記載の熱膨張性耐火樹脂組成物。
項3.樹脂成分が樹脂成分がポリ塩化ビニル、塩素化塩化ビニル及び熱可塑性エラストマーからなる群より選ばれる少なくとも一つを含む、項1又は項2に記載の熱膨張性耐火樹脂組成物。
項4.リン化合物(燐酸エステル可塑剤を除く。)を含有しないことを特徴とする項1~3のいずれか一項に記載の熱膨張性耐火樹脂組成物。
項5.項1~4のいずれか一項に記載の熱膨張性耐火樹脂組成物を備えた耐火部材。
項6.項5に記載の耐火部材を備えた建具。
チレンゴム、スチレン・ブタジエンゴム、ブタジエン・アクリロニトリルゴム、ニトリルゴム、エチレン・プロピレン・ジエン共重合体等のエチレン・α-オレフィン共重合体ゴム等のゴム樹脂等が挙げられる。
るので、600~1500が好ましい。
4-結合型ブタジエンとのコポリマータイプ、クラプレンL-SBR-820(クラレ社製)などのエチレンと1,4-結合型ブタジエンと1,2-結合型ブタジエンとのコポリマータイプ等のものが挙げられる。
、クレー、マイ力、モンモリロナイト、ベントナイト、活性白土、セピオライト、イモゴライト、セリサイト、ガラス繊維、ガラスビーズ、シリカバルン、窒化アルミニウム、窒化ホウ素、窒化ケイ素、カーボンブラック、グラファイト、炭素繊維、炭素バルン、木炭粉末、各種金属粉、チタン酸カリウム、硫酸マグネシウム、チタン酸ジルコニア鉛、アルミニウムボレート、硫化モリブデン、炭化ケイ素、ステンレス繊維、ホウ酸亜鉛、各種磁性粉、スラグ繊維、フライアッシュ、脱水汚泥等が挙げられ、炭酸カルシウム及び加熱時に脱水し、吸熱効果のある水酸化カルシウム、水酸化マグネシウム、水酸化アルミニウム等の含水無機物が好ましい。又、酸化アンチモンは難燃性向上の効果があるので好ましい。これら無機充填剤は単独で用いられてもよいし、二種以上が併用されてもよい。
トリフェニルホスフェート、トリクレジルホスフェート、トリキシレニルホスフェート、クレジルジフェニルホスフェート、キシレニルジフェニルホスフェート等の各種リン酸エステル、
リン酸ナトリウム、リン酸カリウム、リン酸マグネシウム等のリン酸金属塩、
ポリリン酸アンモニウム類、
下記化学式(1)で表される化合物等が挙げられる。
R2は、水酸基、炭素数1~16の直鎖状若しくは分岐状のアルキル基、炭素数1~1
6の直鎖状若しくは分岐状のアルコキシル基、炭素数6~16のアリール基、又は、炭素数6~16のアリールオキシ基を表す。
ホン酸ジメチル、メチルホスホン酸ジエチル、エチルホスホン酸、プロピルホスホン酸、ブチルホスホン酸、2-メチルプロピルホスホン酸、t-ブチルホスホン酸、2,3-ジメチル-ブチルホスホン酸、オクチルホスホン酸、フェニルホスホン酸、ジオクチルフェニルホスホネート、ジメチルホスフィン酸、メチルエチルホスフィン酸、メチルプロピルホスフィン酸、ジエチルホスフィン酸、ジオクチルホスフィン酸、フェニルホスフィン酸、ジエチルフェニルホスフィン酸、ジフェニルホスフィン酸、ビス(4-メトキシフェニル)ホスフィン酸等が挙げられる。
性黒鉛の平均アスペクト比が20以上であり、かかる膨張倍率及び残渣硬さを有することにより、熱膨張性耐火樹脂組成物は優れた形状保持性を有する。
アスペクト比
熱膨張性黒鉛として、ADT社製「ADT501」を実施例1、日本黒鉛工業社製「EXP50T」を実施例2、東ソ一社製「GREP-EG」(膨張開始温度220℃)を比較例1とし、各熱膨張性黒鉛のアスペクト比と、各熱膨張性黒鉛を表1に示した組成で配合した。
(成形性)
実施例1,2及び比較例1のいずれとも、表面が美麗な長尺異型成形体を2時間押出成形でき、2時間押出成形した後のスクリュー及び金型への配合物の付着もなく、成形性は良好であった。
(膨張倍率)
得られた成形体から作製した試験片(長さ100mm、幅100mm、厚さ2.0mm)を電気炉に供給し、600℃で30分間加熱した後、試験片の厚さを測定し、(加熱後の試験片の厚さ)/(加熱前の試験片の厚さ)を膨張倍率として算出した。
(残渣硬さ)
膨張倍率を測定した加熱後の試験片を圧縮試験機(カトーテック社製、「フィンガーフイリングテスター」)に供給し、0.25cm2の圧子で0.1cm/秒の速度で圧縮し
、破断点応力を測定した。
(残渣の形状保持性)
上記残渣硬さは膨張後の残渣の硬さの指標になるが、測定が残渣の表面部分に限られるため、残渣全体の硬さの指標にならないことがあるので、残渣全体の硬さの指標として形状保持性を測定した。残渣の形状保持性は、膨張倍率を測定した試験片の両端部を手で持って持ち上げて、その際の残渣の崩れやすさを目視して測定した、試験片が崩れることなく持ち上げられた場合をPASSと評価し、試験片が崩壊して持ち上げられない場合をFAILと評価した。
表2に示した配合の成分を含有する配合物を、実施例1~2および比較例1に関して上記に記載したのと同様に一軸押出機に供給し、150℃で断面形状がE字状の長尺異型成形体を1m/hrの速度で2時間押出成形した。
92M、「EPDM」と言う)、実施例21,22ではビスフェノールF型エポキシモノ
マー(油化シェル社製「E807」)、ジアミン系硬化剤(油化シェル社製「EKFL052」)を3:2の配合量で、他配合原料と供に混練、加熱硬化することにより得られるエポキシ樹脂を用いた。
(成形性)
実施例3~22のいずれとも、表面が美麗な長尺異型成形体を2時間押出成形でき、2
時間押出成形した後のスクリュー及び金型への配合物の付着もなく、成形性は良好であった。
(膨張倍率)
得られた成形体から作製した試験片(長さ100mm、幅100mm、厚さ2.0mm)を電気炉に供給し、600℃で30分間加熱した後、試験片の厚さを測定し、(加熱後の試験片の厚さ)/(加熱前の試験片の厚さ)を膨張倍率として算出した。
(残渣硬さ)
膨張倍率を測定した加熱後の試験片を圧縮試験機(カトーテック社製、「フィンガーフイリングテスター」)に供給し、0.25cm2の圧子で0.1cm/秒の速度で圧縮し
、破断点応力を測定した。
(残渣の形状保持性)
上記残渣硬さは膨張後の残渣の硬さの指標になるが、測定が残渣の表面部分に限られるため、残渣全体の硬さの指標にならないことがあるので、残渣全体の硬さの指標として形状保持性を測定した。残渣の形状保持性は、膨張倍率を測定した試験片の両端部を手で持って持ち上げて、その際の残渣の崩れやすさを目視して測定した、試験片が崩れることなく持ち上げられた場合をPASSと評価し、試験片が崩壊して持ち上げられない場合をFAILと評価した。
Claims (5)
- 樹脂成分100重量部と熱膨張性黒鉛3~300重量部とを含有する熱膨張性耐火樹脂組成物を押出成形した成形体であって、
前記樹脂成分がポリ塩化ビニルを含み
前記熱膨張性黒鉛の平均アスペクト比が20以上である
ことを特徴とする押出成形体。 - 前記熱膨張性耐火樹脂組成物はリン化合物を含む、請求項1に記載の押出成形体。
- 前記熱膨張性黒鉛の平均粒径が100~1000μmの範囲にあり、かつ平均厚さが50μm以下である、請求項1または2に記載の押出成形体。
- 前記樹脂成分100重量部に対し、無機充填剤(但し、熱膨張性黒鉛を除く。)を2~200重量部含む、請求項1乃至3のいずれか一項に記載の押出成形体。
- 長尺の成形体の製造方法であって、
ポリ塩化ビニルを含む樹脂成分100重量部と平均アスペクト比が20以上である熱膨張性黒鉛3~300重量部とを含有する熱膨張性耐火樹脂組成物を押出成形機で押出成形する、成形体の製造方法。
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