CN101027224B - 包装材料 - Google Patents
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Abstract
本发明涉及一种聚烯烃聚合物包装材料,其包含加入的以至少一种选自Mn、Fe、Cu、Co和Ni的金属的盐形式存在的助氧化剂,从而所述聚烯烃含有矿物质形式的填料,如碳酸钙、滑石、碎大理石、白垩、包括它们的纳米颗粒、方解石、硅石、和纳米颗粒粘土,天然纤维形式的填料,例如纤维素纤维、木纤维、粉末状木材或苎麻、斯卑尔脱稻和淀粉。
Description
技术领域
本发明涉及一种由于自破坏而具有有限寿命的聚合物包装材料,所述包装材料基本上由聚烯烃,如聚乙烯和/或聚丙烯制成。
发明背景
烟草工业遭受抨击不仅因为其销售的产品对健康有害,而且因为其消费者散播废弃的包装和产品残留物。
因此,烟制品的包装相当复杂,通常由内衬、外包装以及最外透明保护层组成。
如果将它们弃于自然界,由纸制成的内衬破坏相当快,而通常由聚合物材料制成或涂覆有聚合物材料的外包装和透明层则破坏较慢。香烟难以破坏的另一部分是过滤嘴部分,它可以在自然界中存留很长时间。
在一些国家,特别是在瑞典,口服鼻烟(oral snuffing)的习惯十分普遍。因此,鼻烟装在鼻烟盒中出售,以前的鼻烟盒由硬纸、或厚纸板制成,但如今,这种鼻烟盒由聚烯烃,例如聚丙烯制成。这种鼻烟盒较硬,弃于自然界中很长时间都难以破坏。
而且,现代吸鼻烟使用剂量包装的鼻烟,也就是说,鼻烟以由非织造纤维材料制成的小袋的形式包装和服用,所述非织造纤维材料能够使烟碱提取物渗透进入口腔。然而,“用尽的”鼻烟袋容易吐出,而且也不能容易地由自然界破坏。为了满足提取期间在口腔润湿时的机械耐久性,鼻烟袋由非织造纤维聚合物制备。
因此,大自然与烟制品废弃物之间紧密相连,至少从美学观点来看,所述烟制品废弃物将引起环境问题。这已经、并且将成为烟草工业的问题。
本发明上下文中,烟制品包装材料包括上述香烟包装材料、香烟过滤嘴、鼻烟盒、鼻烟袋、小雪茄包装材料、嚼烟包装材料、烟斗用烟丝包装材料、待卷烟草包装材料、以及雪茄包装材料,但后者不如前者普遍。
大多数聚合物包装材料可以通过以下三种基本方法中的一种或多种进行回收,它们是:材料重复利用、材料的生物降解和将材料用作燃料实现能量回收。
一般,各种包装材料通常被弃于自然界中并引起环境问题,或者,它们作为有机堆肥程序的一部分弃于自然界中。不管怎样,它们通过气象条件(雨、冰、雪、受热和受冷)、通过紫外线辐射、微生物、能够从聚合物和它们的剩余产品获得营养的不同生物、通过机械手段、和其它因素进行生物降解。
如今使用的大多数包装材料,如大量各种各样的食品包装材料重达约20g(不依赖其尺寸大小)。其中包括运送食物及其它家用物品的袋子,食品包装材料如肉用槽(meat trough)、包装膜、袋及其它,花盆及植物盆和花用包装材料(通常为流延聚丙烯膜),蔬菜用包装材料(聚乙烯和流延聚丙烯膜),糖果袋和零食袋。
通常,聚烯烃如聚乙烯、聚丙烯、聚醋酸乙烯酯和聚苯乙烯用于制备这些包装材料。这些聚合物可以不同方法制备,包括吹胀或发泡形式以提供用于隔离(冲击或温度)目的的大容积终端产品。
Polymer Degradation and Stability 80(2003)39-43,I.Jakubowicz,“Evaluation of degradability of biodegradablepolyethylene(PE)”公开了含有助氧化剂的聚乙烯膜在氧浓度参数随之变化的三个不同温度下热氧化降解的研究。该文章披露了所述聚烯烃是憎水性烃类聚合物,因而它们抗水解并且不能水-生物降解。作为商品,由于存在抗氧化剂和稳定剂,所述聚烯烃更加抗氧化和抗生物降解。
然而,通过使用助氧化剂添加剂可以使聚烯烃能够氧-生物降解。这种助氧化剂可以基于能够产生具有相似稳定性且其氧化值相差一个单位(例如,Mn2+/Mn3+)的两种金属离子的金属结合物。从而,所述材料在包括大气氧的条件下通过自由基链反应而降解。主要产物是能够在助氧化剂的催化作用下发生热解或光解而导致断链和产生低分子量氧化产物如羧酸、醇、酮和低分子量烃蜡的氢过氧化物。过氧化作用还引起亲水性表面改性;这对能够生物吸收低分子量氧化产物的微生物是有利的。还指出,由于低的氧分压,含助氧化剂的PE的堆肥降解非常缓慢。在50、60和70℃的温度下进行测试。该文章表明,如果假定25℃为使用温度,那么,使用确定的活化能,将达到10000分子量的时间定义为所测试膜材料的计算寿命,结果发现,其中一种材料达到该规定将花费约4.5年,而另一种材料(含有双倍量的助氧化剂)需要约2.5年。
发明概述
本发明涉及一种聚烯烃聚合物包装材料,特别是烟草包装材料,尤其涉及可破坏的聚烯烃烟草包装材料。
发明的详细说明
特别地,本文涉及由聚烯烃制成的包装材料,通过加入助氧化剂使所述聚烯烃(一种或多种)可破坏,当经受生物降解和通常气候条件时提供短的破坏时间。
更特别的是,本发明涉及一种聚烯烃聚合物包装材料,其包括加入的以至少一种选自Mn、Fe、Cu、Co和Ni的金属的盐形式存在的助氧化剂,从而所述聚烯烃含有矿物质形式的填料,例如碳酸钙、滑石、碎大理石、白垩、包括它们的纳米颗粒、方解石、硅石和纳米颗粒粘土,天然纤维形式的填料,例如纤维素纤维、木纤维、粉末状木材或者苎麻、斯卑尔脱稻(rice spelt)和淀粉。
根据优选实施方案,聚烯烃是聚丙烯。
根据优选实施方案,聚烯烃是聚乙烯。
根据优选实施方案,金属盐是羧酸盐。
根据优选实施方案,羧酸盐选自硬脂酸盐、油酸盐、棕榈酸盐或它们的混合物。
根据优选实施方案,所述包装材料是注塑或者热塑的鼻烟盒。
根据优选实施方案,所述包装材料是由非织造纤维材料形成的鼻烟罐。
根据本发明,淀粉也被用作一种填料。淀粉可以是助氧化剂添加剂的1-30wt%和高达聚合物总量的60wt%。其可以是不同类型的淀粉,但通常是已证实在聚烯烃聚合物中具有优异性质的玉米淀粉。所述淀粉也可以预处理和形成热塑化淀粉、塑性淀粉、或甘油和水处理的淀粉。
淀粉是谷类植物的主要化学成分。淀粉形成体转变为糖,导致淀粉以颗粒形式集中存在于谷物中。
玉米是淀粉原料的主要来源(83%),然后是小麦(6%)、马铃薯(6%)、木薯(4%)、和其它作物-主要是稻(1%)。
当使用较少聚合物(聚烯烃)时,淀粉与商品塑料共混产生的产品相比仅使用聚烯烃的产品更加可持续。
淀粉具有热塑性,当天然颗粒在热-机械环境中在溶液(增塑剂)存在下分解时,热塑性将释出。作为这种分解的结果,得到了与塑料具有相似性质的热塑性淀粉(TPS)的均质混合物,其可以通过使用标准塑料成型法加工成型。
在与聚烯烃如PE的混合物中,淀粉分解,而不可生物降解的剩余的PE则不分解。如果将AddiFlex混入到共混物中,PE也将在温度、氧和/或紫外线的参与下开始发生生物降解。
淀粉颗粒的粒度从纳米(nm)尺寸至几百微米(my)。
根据优选实施方案,所述包装材料是香烟包装材料。
根据优选实施方案,所述包装材料产品是香烟过滤嘴。
根据优选实施方案,所述包装材料是可折叠袋形式的吸烟用烟草包装材料。
本发明的一个主要优点是任何包装材料都能够重复利用、生物降解、或通过燃烧实现能量回收。因此,所述包装材料不局限于一种回收方式。
下面将参考实施例对本发明进行详细描述,但不限制于所述实施例。
鼻烟盒由聚丙烯制成,并具有以下典型尺寸(以mm计):
·底0.7-1.0
·注塑拱顶0.6-0.9
·主边缘1.0-1.5
·封接边缘重叠部分0.45-0.65
·盖0.65-0.95
·盖帽(lid cover)0.90-1.35
·连接部分2.00-2.50(盖中的容器,用于储存使用过的鼻烟罐)。
鼻烟罐(袋)聚丙烯(PP)非织造材料,具有以下典型特征:
PP(PP切段纤维(spun fiber)) 69-74(%),
(包含色母粒)
(助氧化剂混合物) 6(%)和
典型香烟过滤嘴,由以下组分组成:
聚合物 69-74(%),
(助氧化剂混合物) 6(%)和
作为上述方案的替换方案,可以如下加入木纤维/纤维素:
PP(包含色母粒) 44wt%
木质颗粒(纤维素) 25%(w/w)。
另一种组合物如下所示:
PP(包含色母粒) 44wt%
淀粉,热塑化的 50%(w/w)。
是瑞典Add-X Biotech AB的一个商标。是瑞士Omya AG的一个商标。
wt%
金属盐(例如,Fe、Mn、Co或Cu的羧酸盐) 0.5-15
淀粉 1.0-30
CaCO3 2.0-50
聚合物(PE或者PP) 25-85。
助氧化剂混合物或添加剂可以1-25%的比例与主要的聚合物基料混合,因此,在上述实施例中含有6%的添加剂,金属盐的含量约为0.03%-1%。
为了更好地混合,碳酸钙和淀粉组分可以调理或预配混。木纤维、粉末状木材或纤维素纤维也可以预配混。
更通常地,以下组分可以混入最终混合物:
wt%
CaCO3 10-70
木纤维/纤维素 10-80
淀粉 1-60
聚烯烃 25-85。
淀粉增强了聚合物制品最初的分解。
聚合物,PE和PP,可以通过注塑或热成型来制备鼻烟盒、或纺丝形成用于非织造纤维pod的纤维。
本发明的聚合物材料可以用于任何成型方法,例如注塑、成型模塑、热塑、薄膜流延、吹塑、冷模塑、袋模塑、真空热成型、压塑、缝口模头挤塑或纺丝成型(span forming)。
从下表可以看到:由聚合物、碳酸钙和助氧化剂(金属羧酸盐)组成的聚合物包装材料将很快老化。
从上表可以明显看出:在80℃老化8天将明显改变聚合物的力学性质,但特别地,含有碳酸钙和助氧化剂的聚合物的断裂伸长率和伸长百分率已经发生了显著变化。在热氧化老化后,所述聚合物几乎丧失了其所有的聚合物特性。
本发明的聚合物包装材料不仅经受热氧化降解,而且还经受紫外线辐射降解。上述的一些助氧化剂将由紫外线引发,并在其氧化反应中在紫外线的支持作用下使聚合物分解。
在同时使用纤维素纤维的情况下,老化对力学强度具有更加显著的影响。
明显地,本发明的聚合物包装材料在较高温度下相当迅速地分解,例如那些商业堆肥厂中的温度,其中,40-80℃的温度是相当普遍的。
Claims (11)
1.一种由聚烯烃聚合物制成的包装材料,其包含加入的以至少一种选自Mn、Fe、Cu、Co和Ni的金属的盐形式存在的助氧化剂,
其特征在于:该包装材料是通过向聚烯烃中加入含有以下组分的助氧化剂混合物获得的:
i)所述助氧化剂,
ii)聚烯烃,
iii)矿物质形式的填料,
iv)天然纤维形式的填料,和
v)淀粉。
2.根据权利要求1所述的包装材料,其中金属盐是羧酸盐。
3.根据权利要求2所述的包装材料,其中羧酸盐选自硬脂酸盐、油酸盐、棕榈酸盐或它们的混合物。
4.根据权利要求1所述的包装材料,其中助氧化剂是硬脂酸亚铁/铁、和/或硬脂酸锰。
5.根据权利要求1所述的包装材料,其中聚烯烃是聚丙烯。
6.根据权利要求1所述的包装材料,其中聚烯烃是聚乙烯。
7.根据权利要求1所述的包装材料,其中矿物质具有包含碳酸钙、方解石、硅石或纳米颗粒粘土的组。
8.根据权利要求7所述的包装材料,其中碳酸钙作为以下提供:滑石、碎大理石或白垩,包括它们的纳米颗粒。
9.根据权利要求1所述的包装材料,其中天然纤维具有包含纤维素纤维、木纤维、粉末状木材或苎麻、斯卑尔脱稻的组。
10.根据权利要求1所述的包装材料,其中包装材料是烟草包装材料。
11.根据权利要求10所述的包装材料,其中包装材料产品是香烟过滤嘴。
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SE0401877A SE530267C3 (sv) | 2004-07-19 | 2004-07-19 | Nedbrytbar förpackning av en polyolefin |
SE0401877-6 | 2004-07-19 | ||
SE04018776 | 2004-07-19 | ||
PCT/SE2005/001117 WO2006009502A1 (en) | 2004-07-19 | 2005-07-06 | Packages |
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CN101027224A CN101027224A (zh) | 2007-08-29 |
CN101027224B true CN101027224B (zh) | 2010-08-04 |
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CN2005800288910A Expired - Fee Related CN101027224B (zh) | 2004-07-19 | 2005-07-06 | 包装材料 |
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US (1) | US7767283B2 (zh) |
EP (1) | EP1773679A4 (zh) |
CN (1) | CN101027224B (zh) |
BR (1) | BRPI0513538A (zh) |
SE (1) | SE530267C3 (zh) |
WO (1) | WO2006009502A1 (zh) |
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Publication number | Publication date |
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SE0401877D0 (sv) | 2004-07-19 |
SE0401877L (sv) | 2006-01-20 |
SE530267C3 (sv) | 2008-05-13 |
WO2006009502A1 (en) | 2006-01-26 |
US20070243350A1 (en) | 2007-10-18 |
EP1773679A4 (en) | 2009-12-30 |
EP1773679A1 (en) | 2007-04-18 |
CN101027224A (zh) | 2007-08-29 |
BRPI0513538A (pt) | 2008-05-06 |
SE530267C2 (sv) | 2008-04-15 |
US7767283B2 (en) | 2010-08-03 |
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