JP2008260795A - 発泡性ポリスチレン系樹脂粒子の製造方法 - Google Patents
発泡性ポリスチレン系樹脂粒子の製造方法 Download PDFInfo
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- JP2008260795A JP2008260795A JP2007102655A JP2007102655A JP2008260795A JP 2008260795 A JP2008260795 A JP 2008260795A JP 2007102655 A JP2007102655 A JP 2007102655A JP 2007102655 A JP2007102655 A JP 2007102655A JP 2008260795 A JP2008260795 A JP 2008260795A
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- Prior art keywords
- monomer
- polymerizable monomer
- resin particles
- styrene
- weight
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Landscapes
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Abstract
【解決手段】 スチレン系単量体を含んでなる重合性単量体(A)を水性媒体中で懸濁重合中、または懸濁重合後、発泡剤を含浸させる発泡性ポリスチレン系樹脂粒子の製造方法において、重合性単量体(A)の重合転化率が85重量%以上の時に、重合性単量体(A)と共重合可能な重合性単量体(B)を重合性単量体(A)仕込量100重量部に対して0.5重量部以上3重量部以下添加することを特徴とする発泡性ポリスチレン系樹脂粒子の製造方法。
【選択図】 なし
Description
−OC(O)C(R3)=CH2
で表される基が好ましい。
重合転化率(%)=100−a(%)
に表される式で算出する。式中a%は重合途中における重合性単量体(A)の重量%である。重合途中における重合性単量体(A)の重量%は、途中の重合体をサンプリングし、重合体乾燥後、ガスクロマトグラフィーにて測定した。ガスクロマトグラフィーの測定条件については後述する。
下記マクロモノマーの製造例中、数平均分子量および分子量分布(重量平均分子量と数平均分子量の比)は、ゲルパーミネーションクロマトグラフィー(GPC)を用いた標準ポリスチレン換算法により算出した。なお、GPCカラムとしてポリスチレン架橋ゲルを充填したもの(shodex GPC K−804;昭和電工(株)製)、GPC溶媒としてクロロホルムを用いた。
特開2004−203932号公報の製造例2及び実施例2記載の方法に基づき実施した。精製後のマクロモノマーの数平均分子量は25600、分子量分布は1.25、ガラス転移温度−54℃であった。
6Lの回転撹拌機付きオートクレーブ内に、蒸留水2403.4g、第三リン酸カルシウム31.6g、α―オレフィンスルホン酸ソーダ13.6g、食塩6.8gを仕込んだ。次いで、スチレン1769.7g、アクリロニトリル339.0g、製造例1で作製した両末端にアクリロイル基を有するマクロモノマー124.3gの混合溶液にベンゾイルパーオキサイド8.02g、1,1−ジ(t−ブチルパーオキシ)3,3,5−トリメチルシクロヘキサン4.77g、ヘキサブロモシクロドデカン16.95g、2,3−ジメチル−2,3−ジフェニルブタン4.77g、2,4−ジフェニル−4−メチル−1−ペンテン4.5g、ヤシ油22.6gを溶解させ、オートクレーブに仕込んだ。次に、該オートクレーブを85℃の温度まで昇温して同温度で6時間重合させ、重合性単量体(B)として、アクリロニトリル28.25gを追加圧入した。混合ブタン(重量比:ノルマル/イソ=75/25)135.6gを圧入し、その後、オートクレーブを114℃の温度まで昇温させて、生成したスチレン系樹脂粒子中に混合ブタンを5時間かけて含浸させた。この後、反応系を40℃の温度にまで徐冷し、重合を終了させ発泡性スチレン系樹脂粒子を得た。
重合性単量体(B)のアクリロニトリル量を22.6gとした以外は実施例1と同様に行い、発泡性スチレン系樹脂粒子を得た。
重合性単量体(B)のアクリロニトリル量を16.95gとした以外は実施例1と同様に行い、発泡性スチレン系樹脂粒子を得た。
重合性単量体(B)であるアクリロニトリルを添加しなかったこと以外は実施例1と同様に行い、発泡性スチレン系樹脂粒子を得た。
重合性単量体(B)であるアクリロニトリルを添加せず、混合ブタン含浸時間を10時間に延長したこと以外は実施例1と同様に行い、発泡性スチレン系樹脂粒子を得た。
重合性単量体(B)であるアクリロニトリルを添加せず、混合ブタン含浸温度を120℃10時間としたこと以外は実施例1と同様に行い、発泡性スチレン系樹脂粒子を得た。
(分子量の測定)
本発明の発泡性熱可塑性樹脂粒子の重量平均分子量測定は、ゲルパーミエーションクロマトグラフィー(GPC)を用いた標準ポリスチレン換算法により算出した。(GPC 東ソー(株)製HLC−8020、カラム:TSKgel GMHXL30cm×2、カラム温度:35℃、流速:1ml/min)GPC溶媒としてテトラヒドロフランを用いた
発泡性熱可塑性樹脂粒子0.2gを入れたサンプル瓶にテトラヒドロフラン20mlを投入し、8時間攪拌した後に、上澄みのテトラヒドロフラン溶液を採取し、0.2μmのフィルター(東ソー製 マイショリディスクH−13−2)で濾過した溶液で重量平均分子量の測定を実施した。
発泡性スチレン系樹脂粒子0.2gを入れたサンプル瓶に塩化メチレン20mlを投入し、8時間攪拌した後に、上澄みの塩化メチレン溶液を採取してガスクロマトグラフィー(島津製作所製 GC−14B、カラム3m、充填剤 GLサイエンス製PEG20M、カラム温度110℃、インジェエクション温度170℃、ディテクション温度170℃、キャリアーガス ヘリウム50ml/min、内部標準液 シクロペンタノール(0.1%))にて測定した。検出限界は100ppmであった。
Claims (3)
- スチレン系単量体を含んでなる重合性単量体(A)を水性媒体中で懸濁重合中、または懸濁重合後、発泡剤を含浸させる発泡性ポリスチレン系樹脂粒子の製造方法において、重合性単量体(A)の重合転化率が85重量%以上の時に、重合性単量体(A)と共重合可能な重合性単量体(B)を重合性単量体(A)仕込量100重量部に対して0.5重量部以上3重量部以下添加することを特徴とする発泡性ポリスチレン系樹脂粒子の製造方法。
- 重合性単量体(B)が、ニトリル系単量体である請求項1記載の発泡性ポリスチレン系樹脂粒子の製造方法。
- 請求項1または2に記載の製造方法によって得られる発泡性ポリスチレン系樹脂粒子を予備発泡させて、ポリスチレン系樹脂発泡粒子とし、該ポリスチレン系樹脂発泡粒子を型内成形してなるポリスチレン系樹脂発泡成形体。
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WO2019026966A1 (ja) * | 2017-08-04 | 2019-02-07 | 株式会社カネカ | 発泡性ポリスチレン系樹脂粒子、ポリスチレン系予備発泡粒子、発泡成形体、及びそれらの製造方法 |
WO2021187142A1 (ja) | 2020-03-18 | 2021-09-23 | 株式会社カネカ | 発泡性樹脂粒子、発泡粒子、発泡成形体および発泡性樹脂粒子の製造方法 |
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WO2021187142A1 (ja) | 2020-03-18 | 2021-09-23 | 株式会社カネカ | 発泡性樹脂粒子、発泡粒子、発泡成形体および発泡性樹脂粒子の製造方法 |
CN115279823A (zh) * | 2020-03-18 | 2022-11-01 | 株式会社钟化 | 发泡性树脂颗粒、发泡颗粒、发泡成形体及发泡性树脂颗粒的制造方法 |
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