JP2024051835A - 繊維状セルロース複合樹脂、繊維状セルロース含有物、及び繊維状セルロース複合樹脂の製造方法 - Google Patents
繊維状セルロース複合樹脂、繊維状セルロース含有物、及び繊維状セルロース複合樹脂の製造方法 Download PDFInfo
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Abstract
Description
前記繊維状セルロースは、ヒドロキシ基の一部又は全部がカルバメート基で置換されたFine率A25%以上、フィブリル化率1.0%以下のカルバメート化マイクロ繊維セルロースである、
ことを特徴とする繊維状セルロース複合樹脂である。
このパルプシートに、尿素及び尿素の誘導体の少なくともいずれか一方を塗工し加熱してカルバメート化パルプシートとし、
このカルバメート化パルプシートを解繊してFine率A25%以上、フィブリル化率1.0%以下のカルバメート化マイクロ繊維セルロースとし、
このカルバメート化マイクロ繊維セルロース及び樹脂を混練して繊維状セルロース複合樹脂とする、
ことを特徴とする繊維状セルロース複合樹脂の製造方法である。
無水マレイン酸変性樹脂と、を含む、
ことを特徴とする繊維状セルロース含有物である。
原料パルプP1としては、例えば、広葉樹、針葉樹等を原料とする木材パルプ、ワラ・バガス・綿・麻・じん皮繊維等を原料とする非木材パルプ、回収古紙、損紙等を原料とする古紙パルプ(DIP)等の中から1種又は2種以上を選択して使用することができる。
本形態の製造方法においては、抄紙工程100において原料パルプP1を抄紙して帯状のパルプシートにする。ここで、帯状とは、所定の幅(例えば、300~10000mm。)を有して連続する細長状のシートであり、紙の製造プロセスにおける湿紙や紙匹と同様、ないしは類似の形状を意味する。
プレドライヤーパート130にて乾燥されたパルプシートは、アフタードライヤーパート220との間のコーターパート210において尿素等が塗工される。ここで、本明細書において、「塗工」とは単に「塗る」行為を意味し、塗られた後の尿素等がどのような状態になるかまでを限定する趣旨ではない。したがって、例えば、尿素等がパルプシートの表面にも残り塗工層が形成される形態の他、尿素等が全てパルプシートに浸み込みパルプシートの表面に塗工層が形成されない形態、つまり単なる含浸状態となる形態をも含む。
すなわち、まず、本形態においては、含浸方式とは、尿素等が入った容器内をパルプシートが走行することで塗工を行う方式を意味する。また、コンマ塗工とは、2本のロールとブレードの間に液だまりを作り、塗工量を調整するクリアランスの間をパルプシートが走行することで塗工を行う方式を意味する。
アフタードライヤーパート220を通り抜けたパルプシート(パルプ繊維含有物)は、例えば、ワインダーパート(図示せず)においていったん巻取り、巻取り原反として保存することができる。その後は、この巻取り原反を、巻き取った状態のままで加熱、冷却等の処理をし、セルロース繊維に尿素等を反応させることも考えられるが、本形態においては、巻取り原反からパルプシートを引き出し、このパルプシートを処理してカルバメート化を進める。
まず、加熱の方法は、大きく2種類(バッチ式、連続式(ロールtoロール式))に分けられる。バッチ式では、一度に多量のサンプルを反応できる設備である高周波加熱装置及びロータリーキルンがある。この点、高周波加熱装置においては、電極内に被加熱物を置くと、被加熱物内部で分極を起こして電荷が生じ、周波数の速度変化により分子は激しい内部摩擦を起こして加熱される。一方、ロータリーキルンは、回転式の高温焼成装置で、製紙業界では、クラフトパルプ化工程の薬品回収工程で使用されている。
X0:脱水前のパルプ中に含まれる水量=脱水前のパルプ水分散液量-脱水前のパルプ濃度×脱水前のパルプ水分散液量
Y0:脱水後のパルプ中に含まれる水量=脱水後のパルプ水分散液量-脱水後のパルプ濃度×脱水後のパルプ水分散液量
A0:脱水後の濾液量=X0-Y0
Dn-1:前段の置換洗浄率
Xn:脱水前のパルプ中に含まれる水量=脱水前のパルプ水分散液量-脱水前のパルプ濃度×脱水前のパルプ水分散液量
Yn:脱水後のパルプ中に含まれる水量=脱水後のパルプ水分散液量-脱水後のパルプ濃度×脱水後のパルプ水分散液量
An:脱水後の濾液量=Xn-Yn
本形態においては、以上のようにして得たカルバメート化セルロース繊維P3を、必要により粉砕する等し、解繊工程X3において解繊(微細化)する。この解繊により、カルバメート化微細繊維P4が得られる。
解繊に先立ってアルカリ処理すると、セルロース繊維が持つヘミセルロースやセルロースの水酸基が一部解離し、分子がアニオン化することで分子内及び分子間水素結合が弱まり、解繊におけるセルロース繊維の分散が促進される。
本形態においては、セルロースナノファイバーは、マイクロ繊維セルロースと同様に微細繊維であり、樹脂の強度向上にとって特有の役割を有する。
以上のようにして得たカルバメート化微細繊維は、酸変性樹脂と混合すると好適である。酸変性樹脂は、その酸基がカルバメート基の一部又は全部とイオン結合又は共有結合する。このイオン結合又は共有結合により、樹脂の補強効果が向上する。
マイクロ繊維セルロース等を含む繊維状セルロースは、分散剤と混合するとより好ましいものになる。分散剤としては、芳香族類にアミン基及び/又は水酸基を有する化合物、脂肪族類にアミン基及び/又は水酸基を有する化合物が好ましい。
繊維状セルロース及び酸変性樹脂、分散剤等の混合物は、樹脂と混練するに先立って乾燥及び粉砕して粉状物にすることができる。この形態によると、樹脂との混練に際して繊維状セルロースを乾燥させる必要がなく、熱効率が良い。また、特に混合物に分散剤が混合されている場合は、当該混合物を乾燥したとしても、マイクロ繊維セルロース等の微細繊維が再分散しなくなるおそれが極めて低い。
繊維水分率(%)=[(乾燥前質量-乾燥後質量)÷乾燥前質量]×100
樹脂組成物には、前述した微細繊維やパルプ等のほか、ケナフ、ジュート麻、マニラ麻、サイザル麻、雁皮、三椏、楮、バナナ、パイナップル、ココヤシ、トウモロコシ、サトウキビ、バガス、ヤシ、パピルス、葦、エスパルト、サバイグラス、麦、稲、竹、各種針葉樹(スギ及びヒノキ等)、広葉樹及び綿花などの各種植物体から得られた植物材料に由来する繊維を含ませることもでき、含まれていてもよい。
繊維状セルロース及び樹脂の混練物は、必要により再度混練する等した後、所望の形状に成形することができる。この成形の大きさや厚さ、形状等は、特に限定されず、例えば、シート状、ペレット状、粉末状、繊維状等とすることができる。
本願の1つの特徴は、セルロース繊維のFine率Aを上げつつ、フィブリル化率を抑えることにある。このための具体的な方法は特に限定されず、例えば、解繊の条件や原料パルプ種等によって調節することができる。ただし、解繊前におけるセルロース繊維の物性が特定の前述した条件(例えば、前述したFine率A等。)を満たすものとするのが好ましく、解繊するセルロース繊維を以上で説明した方法に沿って製造するのがより好ましい。この方法によると、通常の解繊にほとんど変更を加えることなく、Fine率A及びフィブリル化率の条件が満たされることになる。
まず、複数種の原料パルプが所定の配合比で含まれるパルプスラリーにサイズ剤を添加したうえで、所定のコッブサイズ度、坪量となるようにパルプシートを製造した。次に、塗工設備にて、固形分濃度40%の尿素水溶液を、固形分換算の質量比でパルプ:尿素が所定の割合となるように塗工し、アフタードライヤーで乾燥させて尿素塗工シートを得た。得られた尿素塗工シートは、ロールtoロール反応装置で所定の温度・時間で反応させてカルバメート変性セルロースを素材とするシートを得た。その後、このカルバメート変性セルロースのシートを固形分濃度5%になるように水で希釈し、離解機を用いて離解した。離解したカルバメート変性セルロースを蒸留水で希釈撹拌して、脱水洗浄を複数回繰り返し、固形分濃度3.5質量%に調整することで洗浄後カルバメート変性セルロースを得た。洗浄後のカルバメート変性セルロースは、叩解機を用いて、Fine率A(FS5による繊維長分布測定で0.2mm以下の繊維の割合)が25%以上となるまで叩解して、カルバメート変性マイクロ繊維セルロースを得た。得られたカルバメート変性マイクロ繊維セルロースに無水マレイン酸変性ポリプロピレンをカルバメート変性マイクロ繊維セルロース:無水マレイン酸変性ポリプロピレンが67:33となるように添加し、140℃に加熱した接触式乾燥機を用いて加熱し、カルバメート変性マイクロセルロース含有物を得た。次に、このカルバメート変性マイクロ繊維セルロース含有物に、質量基準でカルバメート変性マイクロ繊維:その他の成分=10:90となるようにポリプロピレンのペレットを混合し、180℃、200rpmの条件で二軸混練機にて混錬し、繊維配合率10%のカルバメート変性マイクロ繊維セルロース複合樹脂を得た。この繊維配合率10%のカルバメート変性マイクロ繊維セルロース複合樹脂は、ペレッターで2mm径、2mm長の円柱状にカットし、180℃で直方体試験片(長さ59mm、幅9.6mm、厚さ3.8mm)に射出成型した。
JIS P 8145:2011に準拠した夾雑物測定において、面積率が10mm2/m2未満は〇、10mm2/m2以上は×とした。
ベースPP(1.48GPa)を1.00とした場合において、1.50倍以上は〇、1.50倍未満は×とした。
ベースPP(53.4MPa)を1.00とした場合において、1.25倍以上は〇、1.25倍未満は×とした。
110 ワイヤーパート
120 プレスパート
130 プレドライヤーパート
200 塗工工程
210 コーターパート
220 アフタードライヤーパート
P1 原料パルプ
P2 セルロース繊維含有物
P3 カルバメート化セルロース繊維
P4 カルバメート化微細繊維
X1 抄紙・塗工工程
X2 カルバメート化工程
X3 解繊工程
Claims (5)
- 繊維状セルロース及び樹脂を含み、
前記繊維状セルロースは、ヒドロキシ基の一部又は全部がカルバメート基で置換されたFine率Aが25%以上、フィブリル化率が1.0%以下のカルバメート化マイクロ繊維セルロースである、
ことを特徴とする繊維状セルロース複合樹脂。 - 前記繊維状セルロースの原料繊維は、Fine率Aが20%以上、かつフリーネス300~700mlである、
請求項1に記載の繊維状セルロース複合樹脂。 - カルバメート化マイクロ繊維セルロースの含有率が1~90質量%である、
請求項1に記載の繊維状セルロース複合樹脂。 - ヒドロキシ基の一部又は全部がカルバメート基で置換されたFine率Aが25%以上、フィブリル化率が1.0%以下のカルバメート化マイクロ繊維セルロースと、
無水マレイン酸変性樹脂と、を含む、
ことを特徴とする繊維状セルロース含有物。 - 原料パルプを抄紙して帯状のパルプシートとし、
このパルプシートに、尿素及び尿素の誘導体の少なくともいずれか一方を塗工し加熱してカルバメート化パルプシートとし、
このカルバメート化パルプシートを解繊してFine率Aを25%以上、フィブリル化率を1.0%以下のカルバメート化マイクロ繊維セルロースとし、
このカルバメート化マイクロ繊維セルロース及び樹脂を混練して繊維状セルロース複合樹脂とする、
ことを特徴とする繊維状セルロース複合樹脂の製造方法。
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JP7460329B2 (ja) * | 2019-03-29 | 2024-04-02 | 大王製紙株式会社 | 繊維状セルロース複合樹脂及びその製造方法、並びに樹脂の補強材 |
JP2021155544A (ja) * | 2020-03-26 | 2021-10-07 | 大王製紙株式会社 | 繊維状セルロース、繊維状セルロース複合樹脂及び繊維状セルロースの製造方法 |
WO2022091580A1 (ja) * | 2020-10-26 | 2022-05-05 | 大王製紙株式会社 | 繊維状セルロースの製造方法及び繊維状セルロース複合樹脂の製造方法 |
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