JP3948459B2 - 熱可塑性樹脂組成物の成形品 - Google Patents
熱可塑性樹脂組成物の成形品 Download PDFInfo
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- JP3948459B2 JP3948459B2 JP2004030992A JP2004030992A JP3948459B2 JP 3948459 B2 JP3948459 B2 JP 3948459B2 JP 2004030992 A JP2004030992 A JP 2004030992A JP 2004030992 A JP2004030992 A JP 2004030992A JP 3948459 B2 JP3948459 B2 JP 3948459B2
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- 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 claims description 14
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- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- GKTNLYAAZKKMTQ-UHFFFAOYSA-N n-[bis(dimethylamino)phosphinimyl]-n-methylmethanamine Chemical class CN(C)P(=N)(N(C)C)N(C)C GKTNLYAAZKKMTQ-UHFFFAOYSA-N 0.000 description 1
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 1
- 229920003986 novolac Polymers 0.000 description 1
- 238000007591 painting process Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- PNJWIWWMYCMZRO-UHFFFAOYSA-N pent‐4‐en‐2‐one Natural products CC(=O)CC=C PNJWIWWMYCMZRO-UHFFFAOYSA-N 0.000 description 1
- 125000000951 phenoxy group Chemical group [H]C1=C([H])C([H])=C(O*)C([H])=C1[H] 0.000 description 1
- 229920006287 phenoxy resin Polymers 0.000 description 1
- 239000013034 phenoxy resin Substances 0.000 description 1
- AQSJGOWTSHOLKH-UHFFFAOYSA-N phosphite(3-) Chemical class [O-]P([O-])[O-] AQSJGOWTSHOLKH-UHFFFAOYSA-N 0.000 description 1
- 239000000049 pigment Substances 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
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- 229920001921 poly-methyl-phenyl-siloxane Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
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- 229920006294 polydialkylsiloxane Polymers 0.000 description 1
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Images
Description
ゴム含有グラフト共重合体成分(A):5〜45質量部、好ましくは5〜30質量部
硬質(共)重合体(B):95〜55質量部、好ましくは95〜70質量部
硬質(共)重合体(C):0〜40質量部
である。ゴム含有グラフト共重合体成分(A)の配合量が5質量部未満で硬質(共)重合体(B)の配合量が95質量部を超えると、最終的に得られる熱可塑性樹脂組成物の衝撃性が低くなり実用に耐えないため好ましくない。また、ゴム含有グラフト共重合体成分(A)の配合量が45質量部を超え、硬質(共)重合体(B)の配合量が55質量部未満であると、得られる熱可塑性樹脂組成物の機械強度、特に剛性が低下し、また、耐傷付き性も大幅に低下するため好ましくない。
脱イオン水240部、半硬化牛脂ソーダ石鹸1.5部、水酸化カリウム0.05部、ポリブタジエンラテックス60部(固形分として)、アクリロニトリル12部、スチレン28部、クメンハイドロパーオキサイド0.25部、硫酸第一鉄0.004部、ピロリン酸ナトリウム0.02部、結晶ブドウ糖0.3部を用い、まず、オートクレーブに脱イオン水、半硬化牛脂ソーダ石鹸、水酸化カリウム及びポリブタジエン・ラテックスを仕込み、60℃に加熱した。60℃に保持したままスチレン、アクリロニトリルを添加し、60分間放置した後、クメンハイドロパーオキサイド添加し、硫酸第一鉄、ピロリン酸ナトリウム及び結晶ブドウ糖を2時間かけて連続添加し、その後70℃に昇温して1時間保って反応を完結した。かかる反応によって得た重合体を硫酸により凝固し、充分水洗後、乾燥してゴム含有グラフト共重合体成分(A−1)を得た。このもののグラフト率は○○%であった。
窒素置換した反応器に水120部、ポリビニルアルコール0.5部、アゾビスイソブチルニトリル0.3部、ターシャリードデシルメルカプタン(t−DM)0.5部と、メタクリル酸メチル98部及びアクリル酸メチル2部からなる単量体混合物を加え、開始温度60℃として5時間加熱後、120℃に昇温し、4時間反応後、重合物を取り出した。転化率は94%で、重量平均分子量は150,000であった。
窒素置換した反応器に水120部、ポリビニルアルコール0.5部、アゾビスイソブチルニトリル0.3部、ターシャリードデシルメルカプタン(t−DM)0.5部と、メタクリル酸メチル50部、アクリロニトリル15部及びスチレン35部からなる単量体混合物を加え、開始温度60℃として5時間加熱後、120℃に昇温し、4時間反応後、重合物を取り出した。転化率は96%で、重量平均分子量は130,000であった。
窒素置換した反応器に蒸留水120部、アルキルベンゼンスルホン酸ソーダ0.002部、ポリビニルアルコール0.5部、アゾイソブチルニトリル0.3部と、アクリルニトリル20部及びスチレン80部からなる単量体混合物を加え、開始温度60℃として5時間加熱後、120℃に昇温し4時間反応後、重合物を取り出した。転化率は98%で、重量平均分子量は125,000であった。
グラフト共重合体(A−1)、硬質共重合体(B−1)、硬質共重合体(C−1、C−2)を、表1に示す割合にて、日本製鋼所(株)製「TEX44二軸押出し機」にて混練し、必要に応じサイドフィード機構により無機質充填材としてガラス繊維(平均繊維径13μm、平均繊維長6mm)、タルク(平均粒径2μm)、又は炭素繊維(平均繊維径7μm、平均繊維長6mm)を表1に示す割合で添加し、溶融混練、押出ししてペレットを得た。得られたペレットを下記ヒートサイクル成形又は一般成形で成形した。
得られたペレットを小野産業(株)製「高速ヒートサイクル成形ユニット」を取り付けた住友重機工業(株)製「SG150−SYCAPM IV成形機」を使用し、樹脂温度260℃にて射出し、金型への樹脂充填時の金型温度は110℃、冷却時の金型温度は40℃としてヒートサイクル成形を実施し、外観観察用サンプルとして、図1に示す様な、中央に開口部2を有し、図面(製品)左上及び左下にそれぞれ長方形開口部3と円形開口部4を有し、中央開口部2の4ヶ所にゲート2Aを有する4点ゲート成形品1を得た。
得られたペレットを、東芝機械(株)製「IS55FP−1.5A成形機」を使用して金型温度60℃、樹脂温度260℃でそれぞれのサンプルを成形した。
曲げ弾性率:ASTM D790(常温)
耐衝撃性:ASTM D256(常温 6.4mm)
鉛筆硬度:JIS K5400
成形後の外観:目視にて観察、下記判定基準に基づき判定した。
○:表面光沢があり、ウエルド部の色むらも無く、無機充填材を添加した場合、無
機質充填材が突出していない。
△:表面光沢はあるが、ウエルド部の色むらが若干あり、無機充填材を添加した場
合、無機充填材が若干突出している。
×:表面光沢が無く、ウエルド部の色むらが発生、無機充填材が突出している。
耐傷付き性試験:(株)大栄科学精器製作所製「平面磨耗試験機」にて、ガーゼを用
い、300g荷重で30回往復させた後、表面外観を目視にて観察
、下記判定基準に基づき判定した。
○:傷が全く付いていない。
△:極僅か、傷が付いており、若干の擦り傷が見られる。
×:傷が深く付いており、擦り傷の他、削り粉も見られる。
燃焼性:難燃剤を配合した実施例7と比較例4につき、UL94試験法
(V−0:2.5mm)に基き、評価を行った。
本発明の特許請求範囲の組成で調製された熱可塑性樹脂組成物を用いてヒートサイクル成形した実施例1〜7の成形品は、耐傷付き性が良好であり、かつ表面外観にも優れている。更に、本発明の成形品は、上記特性の他に、ガラス繊維等の無機質充填材が配合されているにも拘らず、従来では無し得なかった、極めて高度な外観を呈する。特に、実施例7では、ガラス繊維と難燃剤を配合しているにも拘らず、耐傷付き性に優れ、高度な外観を呈する難燃V−0レベルの成形品が得られた。
比較例1はグラフト共重合体の配合量が、本発明の特許請求の範囲を外れて多いため、鉛筆硬度が低く、耐傷付き性に劣る。また、成形後の外観に劣り各種ハウジング用途には適さない。
2,3,4 開口部
2A ゲート
Claims (5)
- 熱可塑性樹脂成分として、
ブタジエン系ゴム質重合体の存在下に1種以上のビニル系単量体をグラフト重合して得られるゴム含有グラフト共重合体成分(A)5〜45質量部と、
メタクリル酸エステル系単量体、或いはメタクリル酸エステル系単量体とアクリル酸エステル系単量体及び/又は共重合可能なその他の単量体を重合してなる硬質(共)重合体であって、メタクリル酸エステル系単量体単位の占める割合が70〜100質量%である硬質(共)重合体(B)95〜55質量部
とを合計で100質量部となるように含む熱可塑性樹脂組成物を、
金型のキャビティ表面が交互に加熱冷却される射出成形金型を用いて、金型のキャビティ表面温度を繰り返し上下させるヒートサイクル射出成形法により成形してなる成形品。 - 請求項1において、該熱可塑性樹脂組成物が、前記熱可塑性樹脂成分100質量部中に、更に、芳香族ビニル系単量体、シアン化ビニル系単量体、及び必要に応じて用いられるこれらと共重合可能なその他の単量体から選ばれた1種以上の単量体を重合してなる硬質(共)重合体(C)を40質量部以下含む成形品。
- 請求項1又は2において、該熱可塑性樹脂組成物が、前記熱可塑性樹脂成分100質量部に対して、更に無機質充填材(D)を30質量部以下含有し、該無機質充填材(D)がガラス繊維、ガラスフレーク、炭素繊維、タルク、金属繊維及び酸化亜鉛ウィスカーからなる群より選択される1種又は2種以上である成形品。
- 請求項1ないし3のいずれか1項において、該熱可塑性樹脂組成物が、前記熱可塑性樹脂成分100質量部に対して、更に難燃剤(E)を1〜50質量部を含有する成形品。
- 請求項1ないし4のいずれか1項において、前記熱可塑性樹脂組成物の熱変形温度(HDT)T℃に対してT+(120〜200)℃高い樹脂温度で射出し、金型温度T A ℃はT+(5〜50)℃とし、冷却時の温度T B ℃はT−(10〜50)℃とし、T A −T B =15〜100℃の条件を採用するヒートサイクル射出成形法により得られる成形品。
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