TW202146591A - 塗料組合物以及紙材 - Google Patents
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Abstract
本發明提供一種塗料組合物以及紙材。塗料組合物具有耐水及耐油性質,包括100重量份的丙烯酸樹脂以及25至200重量份的黏土,黏土的長徑比(aspect ratio)大於20。
Description
本發明是有關於一種塗料組合物以及紙材,且特別是該塗料組合物具有耐水及耐油性質,以及該塗料組合物可以用於塗佈紙材。
近年來,一次性塑料及不可回收塑料產品等塑料廢棄物已逐漸成為全球性問題。在習知技術中,紙杯或紙質容器上的聚乙烯襯裡可保留熱度並排除液體。然而,由於大多數紙類回收廠皆缺乏將聚乙烯薄膜過濾掉的設備,如此一來,聚乙烯薄膜材質限制了使用完畢後紙杯和紙質容器的可回收性,因此,許多國家最近已開始減少使用石油衍生的包裝材料,轉而採用生物基(bio-based)包裝材料。
基於上述,開發一種用於紙材的塗料組成物,以取代習知的聚乙烯薄膜襯裡,進而改善使用完畢後紙杯和紙質容器的可回收性,為本領域技術人員亟欲發展的目標。
本發明提供一種塗料組合物,塗料組合物不僅具有高耐水性質、高耐油性質,同時具有可熱封性。
本發明的塗料組合物包括100重量份的丙烯酸樹脂以及25至200重量份的黏土,黏土的長徑比(aspect ratio)大於20。
在本發明的一實施例中,丙烯酸樹脂包括苯乙烯丙烯酸樹脂、甲基丙烯酸樹脂或苯乙烯-丁二烯樹脂。
在本發明的一實施例中,黏土具有層狀結構。
本發明還提供一種紙材,該紙材之至少一表面塗佈上述塗料組合物,以形成第一塗佈層。
在本發明的一實施例中,第一塗佈層的塗佈重量為5 g/m2
至20 g/m2
。
在本發明的一實施例中,在紙材的第一塗佈層上進一步塗佈上述塗料組合物或苯乙烯丙烯酸樹脂,以形成第二塗佈層。
在本發明的一實施例中,第二塗佈層的塗佈重量為5 g/m2
至20 g/m2
,且第一塗佈層的塗佈重量與第二塗佈層的塗佈重量的總和不大於25 g/m2
。
在本發明的一實施例中,紙材的基重為30 g/m2
至600 g/m2
。
在本發明的一實施例中,紙材的紙密度為0.45 g/m2
至0.85 g/cm3
。
基於上述,本發明提供一種塗料組合物以及紙材,塗料組合物包括100重量份的丙烯酸樹脂以及25至200重量份的黏土,黏土的長徑比(aspect ratio)大於20,其不僅具有高耐水性質、高耐油性質以及可熱封性,且以本發明的紙材製備的紙容器或封口紙在紙漿再製漿過程中,上述塗料組合物形成的塗佈層容易與紙材分離,可以達到95%以上的紙纖回收率。
以下,將詳細描述本發明的實施例。然而,這些實施例為例示性,且本發明揭露不限於此。
在本文中,由「一數值至另一數值」表示的範圍,是一種避免在說明書中一一列舉該範圍中的所有數值的概要性表示方式。因此,某一特定數值範圍的記載,涵蓋該數值範圍內的任意數值以及由該數值範圍內的任意數值界定出的較小數值範圍,如同在說明書中說明文寫出該任意數值和該較小數值範圍一樣。
本發明提供一種塗料組合物,其具有耐水及耐油性質,包括100重量份的丙烯酸樹脂以及25至200重量份的黏土,黏土的長徑比(aspect ratio)大於20,且黏土具有層狀結構,可以提供良好的遮蔽性使水分不容易穿透紙層,並與樹脂混合時提供抗黏之優異操作性。由於本發明的塗料組合物包括黏土,因此,可降低使用丙烯酸樹脂的材料成本,同時更能提高阻水性能,乾燥後更能維持被塗佈材料的尺寸穩定性。在本實施例中,丙烯酸樹脂可包括苯乙烯丙烯酸樹脂、甲基丙烯酸樹脂或苯乙烯-丁二烯樹脂,但本發明並不以此為限。
本發明另提供一種紙材,其至少一表面塗佈上述塗料組合物,以形成第一塗佈層,其中第一塗佈層的塗佈重量例如是5 g/m2
至20 g/m2
。雖然在紙材的至少一表面塗佈上述塗料組合物,以形成第一塗佈層,即可達成本發明的發明目的,但本發明的較佳實施方式可在紙材的第一塗佈層上進一步塗佈上述塗料組合物或苯乙烯丙烯酸樹脂,以形成第二塗佈層。在此較佳實施例中,第二塗佈層的塗佈重量例如是5 g/m2
至20 g/m2
,且第一塗佈層的塗佈重量與第二塗佈層的塗佈重量的總和例如是不大於25 g/m2
。必須說明的是,當第二塗佈層由上述塗料組合物形成時,用於形成第一塗佈層以及第二塗佈層的塗料組合物皆可包括100重量份的丙烯酸樹脂以及25至200重量份的黏土,但用於形成第一塗佈層以及第二塗佈層的塗料組合物之黏土含量可以相同或不同。
在本實施例中,紙材的基重例如是30 g/m2
至600 g/m2
,紙材的紙密度例如是0.45 g/m2
至0.85 g/cm3
。當紙材的紙密度在上述範圍內時,具有可撓性,比較有利於包裝紙材的加工。
本發明所述的紙材包括紙或紙板,也可以是木材、聚合物基材(例如:聚乙烯)或其他任何可以塗佈本發明之塗料組合物的基材,不以此為限。本發明提供的紙材具有耐水及耐油性質,適合做為紙類食品包裝材料,包括紙袋、紙容器、紙盒或紙杯。此外,本發明提供的紙材亦具有可熱封性,可用於製備飲料杯的封口紙,取代塑膠封膜。
以下,藉由實驗例來詳細說明上述實施例所提出的塗料組合物以及紙材。然而,下述實驗例並非用以限制本發明。製備紙材
藉由具有加拿大標準游離度(Canadian standard freeness,CSF)350ml的硬木牛皮紙漿(LBKP)和軟木牛皮紙漿(NBKP)獲得原料紙漿。用造紙機對原料紙漿進行造紙,以得到基重為310 g/m2
的紙材。將紙材進一步壓延以提高表面光滑度,且紙密度為0.65±0.1 g/cm3
。製備塗料組合物
通過混合機將作為分散劑添加的黏土(長徑比為25)和聚丙烯酸鈉(相對於黏土為0.3份,乾重)分散,以製備固體成分濃度為68%的高嶺土漿料。以苯乙烯丙烯酸樹脂(Michelman製造的Michem® Coat 95,簡稱為“MC95”)∶黏土=100∶25、100∶33、100∶50、100∶75、100∶100、100∶200的乾重比,將所得的高嶺土漿料與MC95混合,以製備用於以下紙材塗佈的塗料組合物。紙材塗佈
以100 m/min的運行速度在上文中製備的紙材上塗佈塗料組合物,並乾燥以形成第一塗佈層。然後,以100 m/min的運行速度在紙材的第一塗佈層上進一步塗佈塗料組合物或苯乙烯丙烯酸樹脂,以形成第二塗佈層。下方表1列出了實例1至實例17以及比較例1至比較例3中第一塗佈層以及第二塗佈層的塗佈重量和MC95/黏土比例(塗料組合物)。同時,分別以TAPPI T 441測試方法以及The TAPPI T 559測試方法評估實例1至實例17以及比較例1至比較例3的耐水及耐油性質,評估結果列於以下表1中。
TAPPI T 441測試方法藉由Cobb吸水度測試儀測量塗佈層的吸水率。吸水率(Cobb值)定義為特定時間內(表1中所列的是30分鐘內的Cobb值)在1厘米水深下1平方米的紙、紙板或瓦楞纖維板吸收的水量,標準測試時間為120秒。基本上,當Cobb值越低,則代表耐水性越好。
The TAPPI T 559測試方法也被稱為試劑盒測試(kit test),是用於測量塗佈層的耐油性。The TAPPI T 559測試方法包括將一滴蓖麻油、庚烷和甲苯的混合物滴在經塗佈的紙材上,並在15秒後觀察經塗佈的紙材是否變黑。總共使用了十二種不同的混合物,基於混合物的滲透性,將混合物編號為混合物1至混合物12,其中混合物12滲透性最大,而混合物1滲透性最小。混合物中蓖麻油含量越少,混合物的腐蝕性就越強。當至少一部分測試混合物被經塗佈的紙材吸收時,通過經塗佈的紙材的變黑或變色來表示「失敗」,樣品分數是經塗佈的紙材未「失敗」時使用的編號最高的混合物(混合物1至混合物12),在表1中被稱為「試劑盒級別(Kit no.)」。基本上,當Kit no.值越高,則代表耐油性越好。
表1
第一塗佈層 | 第二塗佈層 | Cobb值 (g/m2 ) | Kit no. | |||
MC95/黏土乾重比例 | 塗佈重量(g/m2 ) | MC95/黏土乾重比例 | 塗佈重量(g/m2 ) | |||
實例1 | 100:50 | 5 | 100:25 | 3 | 8 | 5 |
實例2 | 100:50 | 5 | 100:33 | 3 | 5.8 | 5 |
實例3 | 100:50 | 5 | 100:50 | 3 | 7.9 | 5 |
實例4 | 100:50 | 5 | 100:50 | 5 | 4.3 | 5 |
實例5 | 100:75 | 5 | 100:50 | 3 | 4.7 | 5 |
實例6 | 100:50 | 5 | 僅包含MC95,未包含黏土。 | 2 | 10.7 | 6 |
實例7 | 100:75 | 5 | 僅包含MC95,未包含黏土。 | 2 | 4.6 | 5 |
實例8 | 100:100 | 5 | 僅包含MC95,未包含黏土。 | 2 | 4.6 | 5 |
實例9 | 100:200 | 5 | 僅包含MC95,未包含黏土。 | 2 | 9.1 | 5 |
實例10 | 100:100 | 6 | 100:33 | 4 | 8.5 | 5 |
實例11 | 100:100 | 6 | 100:25 | 4 | 7.3 | 5 |
實例12 | 100:25 | 3 | 12.5 | 3 | ||
實例13 | 100:50 | 5 | 15.5 | 5 | ||
實例14 | 100:75 | 5 | 17.6 | 5 | ||
實例15 | 100:100 | 5 | 11.7 | 5 | ||
實例16 | 100:100 | 10 | 5.5 | 6 | ||
實例17 | 100:100 | 15 | 4.5 | 7 | ||
比較例1 | 僅包含MC95,未包含黏土。 | 3 | 僅包含MC95,未包含黏土。 | 3 | 6.6 | 5 |
比較例2 | 僅包含MC95,未包含黏土。 | 3 | 11.4 | 5 | ||
比較例3 | 僅包含MC95,未包含黏土。 | 6 | 8.6 | 6 |
由上方表1可得知,具備由本發明塗料組合物形成的第一塗佈層的實例1至實例17均呈現良好的耐水及耐油性質。此外,具備由本發明塗料組合物或苯乙烯丙烯酸樹脂形成的第二塗佈層的實例1至實例11呈現更佳的耐水性質。此外,比較例1至比較例3僅使用苯乙烯丙烯酸樹脂作為塗料組合物,相較之下,具備由本發明塗料組合物或苯乙烯丙烯酸樹脂形成的第二塗佈層(實例1至實例11)有更好的耐水性質。
綜上所述,本發明提供一種塗料組合物以及紙材,塗料組合物包括100重量份的丙烯酸樹脂以及25至200重量份的黏土,黏土的長徑比(aspect ratio)大於20。本發明紙材的至少一表面塗佈上述塗料組合物,如此一來,不僅具有高耐水性質、高耐油性質以及可熱封性,且在紙漿再製漿過程中可以被完全回收,因此,本發明可以有效地解決習知聚乙烯薄膜材料可回收性不佳的缺點。
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Claims (9)
- 一種塗料組合物,其具有耐水及耐油性質,包括: 100重量份的丙烯酸樹脂;以及 25至200重量份的黏土,所述黏土的長徑比(aspect ratio)大於20。
- 如請求項1所述的塗料組合物,其中所述丙烯酸樹脂包括苯乙烯丙烯酸樹脂、甲基丙烯酸樹脂或苯乙烯-丁二烯樹脂。
- 如請求項1所述的塗料組合物,其中所述黏土具有層狀結構。
- 一種紙材,其至少一表面塗佈如申請專利範圍第1項至第3項中任一項所述的塗料組合物,以形成第一塗佈層。
- 如請求項4所述的紙材,其中所述第一塗佈層的塗佈重量為5 g/m2 至20 g/m2 。
- 如請求項4所述的紙材,其中在所述紙材的所述第一塗佈層上進一步塗佈如申請專利範圍第1項至第3項中任一項所述的塗料組合物或苯乙烯丙烯酸樹脂,以形成第二塗佈層。
- 如請求項6所述的紙材,其中所述第二塗佈層的塗佈重量為5 g/m2 至20 g/m2 ,且所述第一塗佈層的塗佈重量與所述第二塗佈層的塗佈重量的總和不大於25 g/m2 。
- 如請求項4所述的紙材,其中所述紙材的基重為30 g/m2 至600 g/m2 。
- 如請求項4所述的紙材,其中所述紙材的紙密度為0.45 g/m2 至0.85 g/cm3 。
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JPH0921096A (ja) * | 1995-06-30 | 1997-01-21 | New Oji Paper Co Ltd | 防湿性紙 |
JP3020858B2 (ja) * | 1995-12-07 | 2000-03-15 | 日本製紙株式会社 | 紙器原紙 |
US7608338B2 (en) * | 2002-06-13 | 2009-10-27 | International Paper Company | High brightness coating compositions and related products |
JP4344930B2 (ja) * | 2004-01-30 | 2009-10-14 | 王子製紙株式会社 | 印刷用塗被紙 |
JP2008290771A (ja) * | 2007-04-27 | 2008-12-04 | Sumitomo Chemical Co Ltd | バリア性容器の製造方法 |
JP5331265B1 (ja) * | 2011-11-10 | 2013-10-30 | 日本製紙株式会社 | 紙製バリア包装材料 |
CN103422396B (zh) * | 2012-05-24 | 2015-09-30 | 金东纸业(江苏)股份有限公司 | 涂布纸及应用该涂布纸的不干胶底纸 |
JP2013256013A (ja) * | 2012-06-11 | 2013-12-26 | Nippon Paper Industries Co Ltd | 紙製バリア包装材料 |
JP6236329B2 (ja) * | 2013-03-08 | 2017-11-22 | 日本製紙株式会社 | 紙製バリア包装材料 |
JP2014173201A (ja) * | 2013-03-08 | 2014-09-22 | Nippon Paper Industries Co Ltd | 紙製バリア包装材料 |
JP2014181409A (ja) * | 2013-03-18 | 2014-09-29 | Nippon Paper Industries Co Ltd | 紙製バリア包装材料 |
JP2015117453A (ja) * | 2013-12-20 | 2015-06-25 | 王子ホールディングス株式会社 | 塗工ライナー、その塗工ライナーを用いた段ボールシート及び塗工ライナーの製造方法 |
US9771688B2 (en) * | 2015-02-11 | 2017-09-26 | Westrock Mwv, Llc | Oil, grease, and moisture resistant paperboard |
JP6373774B2 (ja) * | 2015-02-27 | 2018-08-15 | 北越コーポレーション株式会社 | 工程剥離紙用原紙およびその製造方法 |
US9732474B2 (en) * | 2015-05-29 | 2017-08-15 | International Paper Company | Hydrophobic coated paper substrate for polymer emulsion topcoats and method for making same |
JP6445411B2 (ja) * | 2015-09-01 | 2018-12-26 | 北越コーポレーション株式会社 | 耐水耐油紙 |
JP6864538B2 (ja) * | 2017-04-26 | 2021-04-28 | 大王製紙株式会社 | 耐油紙 |
US11299855B2 (en) * | 2018-02-19 | 2022-04-12 | Westrock Mwv, Llc | Paperboard structure with at least one barrier coating layer |
JP7233278B2 (ja) * | 2018-03-28 | 2023-03-06 | 日本製紙株式会社 | 紙製バリア材料 |
WO2019189229A1 (ja) * | 2018-03-28 | 2019-10-03 | 日本製紙株式会社 | 紙製バリア材料 |
US11578462B2 (en) * | 2018-04-27 | 2023-02-14 | Westrock Mwv, Llc | Anti-blocking high barrier paperboard structures |
KR102267634B1 (ko) * | 2018-06-05 | 2021-06-21 | (주)리페이퍼 | 수분산성 제지용 코팅제 조성물 및 이를 이용한 방습성과 블록킹성이 향상된 친환경 식품 포장지의 제조방법 |
JP7176922B2 (ja) * | 2018-10-19 | 2022-11-22 | 大王製紙株式会社 | 耐油紙 |
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- 2021-04-13 EP EP21168027.7A patent/EP3922769A1/en active Pending
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