CN109843582B - 可热变形的片材 - Google Patents

可热变形的片材 Download PDF

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Publication number
CN109843582B
CN109843582B CN201780063595.7A CN201780063595A CN109843582B CN 109843582 B CN109843582 B CN 109843582B CN 201780063595 A CN201780063595 A CN 201780063595A CN 109843582 B CN109843582 B CN 109843582B
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component
film
curable
sheet
cured
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CN109843582A (zh
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曼弗雷德·欧博克夫勒
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Austria Senoplas GmbH
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Austria Senoplas GmbH
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  • Chemical & Material Sciences (AREA)
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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Laminated Bodies (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

一种可热变形的片材或膜,包括热塑性塑料片材或塑料膜(2、3)和设置于其上的具有至少两种组成部分的漆顶层(1),其特征在于,所述漆顶层(1)具有作为第一组成部分的可热成型的组分和作为第二组成部分的可热固化的组分。

Description

可热变形的片材
本发明涉及一种可热变形的片材或膜以及一种用于制造这种片材或膜的方法。此外,本发明涉及一种可热变形的片材以及这种片材的各种不同的应用。
背景技术
可热变形的片材使用在众多的应用领域中,比如在汽车工业中用于KFZ、LKW、有篷车、建筑机械、商用车的车身构件,在卫生领域中用于浴缸或淋浴盆,在家具工业中用于家具膜,在建筑行业针对E&E外壳用于休闲设备和运动设备,或者应用在铁路和航空工业中。虽然这种片材极好地可加工,但它们无法达到在相应的应用领域通常要求的特性。特别地,机械的和物理-化学的特性比如耐刮擦性、化学耐受性例如通常不足以用于汽车应用。
在现有技术中已经记载了各种不同的如何才能提高这种可热变形的片材的表面特性的方案。在EP 1 737 654 B1中例如介绍了一种“双重固化”系统,其中,通过滚压、刮涂或流动涂布将可分两阶段固化的漆涂覆到带状材料上,然后通过排出漆的溶剂进行物理干燥。然后对具有这种部分固化的漆层的片材进行热成型或热塑性变形。在变形之后,漆层通过UV辐射最终交联并完全固化。在该现有技术中产生了两个问题:首先,部分固化的片材经受不住堆叠,并且在存放时也不稳定。其次,在“阴影位置”,即由于片材或膜的3D几何形状而产生的并且对于UV辐射不可抵达的位置,难以进行UV固化。
根据现有技术的另一种方案,采取事后将片材或膜上漆的策略。在这种情况下,塑料片材或膜被热成型,并且事后例如通过喷漆或流动涂布予以上漆。尽管这种方法本身提供了良好的结果,但它非常复杂,并且牵涉到大量的过喷和返工。另外,在该方法中会出现涂层条带;在喷漆中经常观察到并非所愿的橘皮,并且在流动涂布时经常观察到彩虹效应。在该方法中,在那些由于热成型片材的几何形状而难以接近的地方也存在涂漆的问题。
根据现有技术的第三种方案是所谓的双组分注塑(“2K注塑”)。在双组分注塑时,在注塑机中将液态多组分-反应系统引入到注塑机模具的模腔中,并且在随后的压花步骤中将涂层均匀地分布在模塑件的表面上。涂层在模具中固化,从而构件可以脱模。在取出构件之后,通过UV辐射对漆进行固化。该方法提供了非常耐刮擦的表面,但是成本非常高,只能用于小面积的构件,并且同样不适合于阴影位置。在合理的成本范围内难以实现车身应用。
简短的发明介绍
因此,根据现有技术的所有方法要么成本高昂、繁琐,要么不提供全面地一致的带漆层的涂层。
因此,本发明的目的是,提出一种可热变形的片材或膜,其中不会出现这些缺点。
该目的通过一种可热变形的片材或膜得以实现,其包括热塑性塑料片材或塑料膜和设置于其上的具有至少两种组成部分的漆顶层,其特征在于,所述漆顶层具有作为第一组成部分的可热成型的组分和作为第二组成部分的可热固化的组分。
这种片材或膜可以直接由热塑性塑料片材或塑料膜的制造商,通过把可分两阶段固化的漆涂覆到热塑性塑料片材或塑料膜上来提供。固化的第一阶段例如仍在热塑性塑料片材或塑料膜的制造商处进行,而第二阶段—漆的最终固化—在热成型工艺地点进行,确切地说,与热成型工艺同时进行。
漆顶层不应该被理解为它是两个分别具有两种组成部分之一的分开的层。确切地说,漆顶层应这样理解:漆顶层的两种组成部分彼此混合或搀和。
当涂覆到塑料膜或塑料片材上时,漆仍然是液态的。此后,进行第一组成部分的固化。固化了的第一组成部分是可热成型的,也就是说,在温度和压力的影响下,第一组成部分可以可逆地变形。在第一组成部分固化之后,漆顶层的硬度已经可以实现存放和堆叠所述片材或膜,或者可以实现这种片材或膜的随后的热成型,而不会影响到特别是整体的外观特性和表面品质。然而,漆顶层尚未完全固化或彻底固化。优选地,在第一组成部分固化之后并且在第二组成部分热固化之前,漆顶层对丙酮具有不到5分钟的化学耐受性。在第二组成部分固化之后,漆顶层对丙酮具有超过5分钟的化学耐受性。
因此规定,可热成型的第一组成部分固化,以便可以实现热成型。最初在涂覆漆顶层时,第一组成部分或第一组成部分的组分仍为液态且未固化。
优选地,在所述片材或膜热成型时,漆顶层的第二组成部分完全固化。有时可能还需要略微的优选热的后固化。固化是指如下过程:在该过程中,通过漆顶层中的单体和低聚物的聚合,引发聚合过程,从而漆顶层的硬度出现提高。
可热变形的片材或膜是指,该片材或膜可在压力和温度影响下变形。在这种变形中,漆顶层的第二组成部分固化。可热变形的片材或膜也可以热塑性地变形。
在另一方面中,本发明涉及一种用于制造可热变形的膜或片材的方法。
用于制造可热变形的塑料片材或塑料膜的该方法包括如下步骤:
(i)提供热塑性的塑料片材或塑料膜;
(ii)涂覆具有可固化的第一组成部分和可热固化的第二组成部分的漆,第一组成部分在固化状态下可热塑性地变形;
(iii)仅使得可固化的第一组成部分固化。
在一个方面中,本发明还涉及一种用于制造可变形的塑料片材或塑料膜的方法,其要么包括如下步骤:
(i)提供热塑性的塑料片材或塑料膜;
(ii)涂覆具有可固化的第一组成部分和可热固化的第二组成部分的漆,第一组成部分在固化状态下可热塑性地变形;
(iii)仅使得可固化的第一组成部分固化,也就是说,第二组成部分不固化;
(iv)使得塑料片材热成型为所希望的三维形状,同时使得可热固化的组分固化;
要么包括如下步骤:
(a)提供前述类型的可热塑性地变形的片材或膜;
(b)使得塑料片材热成型为所希望的三维形状,同时使得可热固化的组分固化。
这种片材或膜的应用领域例如包括汽车工业、铁路和航空工业;家具工业;建筑行业;卫生领域;休闲和运动。
在汽车工业中,在铁路和航空工业中,例如考虑采用外部区域,如KFZ、LKW、有篷车、建筑机械、商用车的车身构件,比如车顶模块、装饰面板、保险杠、行李箱盖;全面的车身部件或内部区域,如面板、装饰板、装饰条、显示器、功能性操作单元等。在家具工业中,可以示范性地提及家具膜、家具零件等。在卫生领域可提及浴缸或淋浴盆。一般来说,这种膜可以作为外壳应用在所有的工业领域中,用于箱包或设备壳体等,或者应用在建筑行业,用于E&E外壳,用于休闲和运动设备。特别地,机械特性和物理-化学特性比如耐刮擦性、化学耐受性在现有技术中通常不足以用于汽车应用,因此对根据本发明的膜或片材存在很大的需求。
详细的发明介绍:
下面详述本发明的优点和细节。
术语“膜”或“塑料膜”和“片材”或“塑料片材”在本专利申请的范畴内同义地使用,即使只提到一个膜或片材,同样也指多个膜和片材。
塑料膜或塑料片材:
热塑性塑料片材或膜是漆顶层的载体,并且它可热变形。热塑性塑料膜可以单层地或多层地构造。在多层热塑性塑料片材或膜的情况下,其优选是共挤出物。优选地,热塑性塑料片材或膜是平面的多层复合体,该多层复合体包括衬底层和至少一个其它层。
作为热塑性塑料片材或膜的主要组成部分,采用热塑性材料比如热塑性聚合物。热塑性材料在本发明的范畴内是指一种塑料,该塑料可以在一定的温度范围内热塑性地变形。热塑性的变形是一种可逆的过程,从而热塑性材料可以通过冷却和加热到可变形的状态任意频繁地复原。热塑性材料包括纯塑料(均聚物、杂聚物或共聚物)和塑料混合物(不同塑料的混合物)。
作为热塑性材料,可以提及聚烯烃、苯乙烯聚合物、聚碳酸酯(PC)、聚丙烯酸酯、聚酯等。在聚烯烃的组中,可以例如提及聚乙烯或聚丙烯。在苯乙烯聚合物组中,可以例如提及丙烯腈-丁二烯-苯乙烯三元共聚物(ABS)、聚苯乙烯(PS)、抗冲击改性聚苯乙烯(HI-PS)、丙烯睛-苯乙烯-丙烯酸酯(ASA)、其它包括共聚物的苯乙烯单元。对于聚酯,应提及聚对苯二甲酸乙二醇酯(PET)或改性的共聚物比如乙二醇改性的聚对苯二甲酸乙二醇酯(PETG)。聚丙烯酸酯的最重要的代表物包括聚甲基丙烯酸甲酯(PMMA)和抗冲击改性聚甲基丙烯酸甲酯(HI-PMMA)。此外,热塑性材料可以例如是热塑性弹性体(TPE)、基于烯烃的热塑性弹性体(TPO)或热塑性聚氨酯(TPU)。
此外,也可以存在塑料混合物作为热塑性材料,或者可能需要添加附加的物质,以便实现所希望的特性。作为前述塑料的混合物,可以例如提及ABS/PMMA或ABS/PC。
如果热塑性塑料片材或膜多层地构造,则各个层同样可以含有前述聚合物。值得一提的是PMMA与ABS或者PC与PMMA的组合,比如塑料膜,其带有ABS或PC作为承载层主要组分,且带有PMMA作为塑料膜的其它层。然后把漆层涂覆到塑料膜(例如PMMA)的上层上。
这些层有时可以含有研磨料、再循环料或再生料(例如来自先前的生产步骤或者来自对挤出设备的调节或者来自边缘修整)。也可以添加着色剂和/或UV-添加剂。
也可以添加消光剂,其通常是添加剂,该添加剂影响涂层表面,使得其光泽度降低。这通常牵涉到表面粗糙度增大,其在层压后续工艺中表现出改善的加工特性。合适的消光剂对于本领域技术人员来说是已知的,并且例如包括无机的填充物,特别是硅酸或珠状交联聚合物(“聚合物珠”),优选丙烯酸酯珠。添加量优选介于0.1%(重量)与5%(重量)之间。
着色剂是指颜料、染料或效果颜料。与染料相反,颜料不溶于载体介质中。载体介质是掺入颜料的物质,例如漆或塑料。染料和颜料一起属于着色剂,可以是无机或有机的,有色的或无色的。
太阳光的紫外线部分会导致光降解。为了防止或延迟这种效应,可以添加UV添加剂。根据这些UV添加剂的作用方式,分为UV吸收剂和UV稳定剂。UV吸收剂导致UV辐射的吸收,UV辐射穿过聚合物并将其转化为热能。UV稳定剂抑制由UV辐射照射产生的自由基,并阻止进一步分解。
衬底层的厚度优选地在50μm和5mm之间。可能的附加层优选具有介于5μm和1mm之间的厚度。
漆顶层:
用于漆顶层的漆最初是多组分漆(至少双组分清漆),或含有至少两种不同地固化的组分的漆。具体而言,多组分漆是单体与以不同方式聚合(=固化)的低聚物的混合物。
在当前情况下规定了两种可以彼此独立地固化的组成部分。第一种组成部分在成品(可热变形的片材或膜)中已经固化。例如,第一种组成部分同样可以是可热固化的组分。在这种情况下,第二种组成部分必须在比第一种组成部分更高的温度下固化。
优选地,漆中的第一种组成部分是借助UV-光可固化的组分,即在成品中借助UV-光可固化的组成部分。
可能的借助UV-光可固化的组分可以例如包括丙烯酸酯低聚物,比如氨基甲酸酯(甲基)丙烯酸酯-低聚物,例如巴斯夫的
Figure BDA0002027382750000051
UA 9072。其它成分为反应性稀释剂、光引发剂、任选的消泡剂和UV-添加剂。
优选地规定,可UV光固化的组分包含丙烯酸酯低聚物优选氨基甲酸酯(甲基)丙烯酸酯-低聚物、反应性稀释剂和光引发剂。光引发剂是化学化合物,其在用UV-光照射后经历光解,于是形成诸如基的反应性物质,并且可以引起聚合。反应性稀释剂是降低漆粘度并且在随后的漆固化时通过共聚合变成漆的一部分的物质。例如考虑环氧化物、苯乙烯或丙烯酸酯。
在本发明的范畴内,UV-光是指波长在约380nm~10nm范围内的辐射。
与传统的双组分-漆体系相反,该配方没有适用期。
可热固化的组分优选包含封端的(或被封端的)异氰酸酯和多元醇。封端异氰酸酯是高反应性异氰酸酯例如与醇(“氨基甲酸酯”)或与胺(“脲”)的加成化合物。在较高温度下,随后又释放这些异氰酸酯,以便然后与作为反应物的多元醇发生聚合反应。作为多元醇,例如可以提及芳族聚酯多元醇,比如Huntsman的Terol
Figure BDA0002027382750000061
多元醇。
通过将漆涂覆到基材上并部分固化来制备漆顶层。部分固化仅涉及第一组分,而不涉及第二组分。通过使用0.01~5%(重量)的UV-添加剂(UV-吸收剂和UV-稳定剂),保护在位于其下面的各层中使用的材料和着色剂免受UV-辐射,从而显著改善在UV-光照射情况下在使用期间的颜色稳定性以及保持恒定的材料特性。此外,顶层或UV-漆可以是透明的,或者设有不同的着色剂。在漆层中还可以含有纳米颗粒,以便改善各种性能。
已知有许多涂覆涂层的方法。于是可提及刷涂、滚涂、喷涂、流动涂布、浇注、刮涂、滚转、刮抹和滚压。通过这些方法覆设通常含有有机溶剂或水或两者的漆体系。溶剂在涂层过程之后通常在干燥室中蒸发,因此存在大的能量需求和空间需求。
优选地,漆基本上不含溶剂,因为溶剂对环境有害。而且,含有溶剂的漆具有其它缺点,这些缺点的产生方式例如为,由于漆的蒸发会出现漆层厚度波动。
漆顶层既可以有光泽地设计,或者无光泽地设计。
由于很多塑料,如PMMA/ABS或PC/PMMA共挤出物可在140℃和210℃之间热成形,封端的异氰酸酯优选是在140℃和210℃之间、优选在160℃~190℃、更优选在165℃~185℃之间释放出异氰酸酯的物质。作为封端的异氰酸酯,可以例如加入芳族异氰酸酯(例如单体二苯基甲烷二异氰酸酯)和/或脂族异氰酸酯(例如异佛尔酮二异氰酸酯)。通过合适的添加剂如封端剂,可以设定第二组成部分固化的温度。
漆必须在第二组成部分热固化之前可热成型。在热固化之后(即在第二组成部分也固化之后),漆始终都可以热塑性地变形,但它也可以热固性地设计。
还可以在部分交联的漆层上覆设保护膜,以便保护表面,用于运输过程以及进一步加工。这种保护膜通常由聚乙烯或PET构成,它们可以在背面具有附着层。
顶层的厚度优选介于1μm和100μm之间,优选约5~20μm。
第一组成部分与第二组成部分之间的混合比例优选介于3:1和1:3之间(按质量份额)。
可热固化的组分包括热固化所需的所有成分,而UV-光可固化的组分包括所有通过UV-光固化的成分。
本发明的范例和其它优点:
图1示意性地示出根据该范例的可热变形的片材的结构;
图2a、2b示出FT-IR光谱,其表明了温度对顶层的固化的影响,其中,图2b示出了在750~1050cm-1范围内的详图。
本发明的一个优点是,要么省去事后上漆的加工步骤,要么省去UV-固化。带有部分固化的漆层的片材的堆叠强度也优于现有技术。另一个优点在于三维成形构件的更均匀的固化。
可热变形的片材可以用保护膜变形,这在传统的双重固化体系中是不可能的,因为仅仅物理交联。由此在加工过程中和在其它加工步骤中或在运输中附加地保护表面。可以在通常的设备上进行热成型。在第一组成部分固化之后(并且在第二组成部分固化之前),漆顶层-表面是触指干的、耐堆叠且存放稳固。漆层是弹性的且可拉伸。
在如下各表格中,借助范例列出所实现的与热成型参数相关的性能。这里涉及具有以下结构的复合体:
具有层结构的复合体(见图1):
Figure BDA0002027382750000071
层2~6被共挤出,并且借助辊把漆作为漆顶层(层1)覆设到层2上。漆的构成部分包括在表格1中归纳的组分的混合物:
表格1:漆顶层的漆的构成部分:
Figure BDA0002027382750000072
Figure BDA0002027382750000081
根据表格1的漆的组成部分1~3形成具有丙烯酸组分的第一组成部分。组成部分1~3借助UV-光固化,并且所得到的组分在固化之后可热塑性地变形。
组分4~7的混合物形成漆顶层的第二组成部分。这些组分在第二步骤中固化。在随后的表格2中研究了通过热成型热处理使得第一种组分固化之后(“在变形之前”)和第二种组分固化之后的漆顶层的性质。热成型温度为180℃。
表格2:在第一种组成部分固化之后和在第二种组成部分固化之前或之后对漆层的研究。
Figure BDA0002027382750000082
a进行的试验:
指甲测试,根据BMW集团的标准GS 97034-2
指甲测试的塑料=PMMA
直径=16mm;厚度为1mm
盘片边缘的圆度半径=0.5mm
硬度=肖氏D85
试验速度=200(+/-20)mm/s;试验载荷=20N
根据指甲测试的结果的评估:
注1:看不到痕迹(表面无变化)
注2:能看到略微的/轻微的痕迹
注3:能看到明显的痕迹。
根据丙酮测试的结果的评估:
按照下述的分类代码,根据DIN EN 12720:2009-07的分类代码,通过与每种液体的参考面的比较来评估试验区:
5=看不到变化(无损伤)
4=轻微的光泽度或颜色(反射)变化,或者可看到分隔标记
3=可从多个视角看到轻微的标记,例如几乎完整的圆或圆面
2=明显的标记(边缘),但表面结构在很大程度上未改变
1=明显的标记,表面结构改变,或者表面材料完全地或部分地损毁,或者纸张附着在表面上。
对根据GMW14445的防晒霜测试的评估:
1=无变化
2=轻微的光泽度或颜色变化,略微鼓起或其它能容忍的效应/变化
3=明显的光泽度或颜色变化,明显的鼓起、起泡、脱落或其它不可容忍的效应/变化
4=非常明显的光泽度或颜色变化,非常明显的鼓起、起泡、脱落或其它不可容忍的效应/变化
图1示意性地示出了该范例的可热变形的片材的横截面,其包括顶层1和热塑性的塑料片材,该塑料片材包括总共五层2、3、4、5、6。在此,衬底层5占据主要部分。剩余的层2、3、4、6可以有助于附加的机械的和/或光学的特性。在所示的范例中,在漆顶层1的表面上示出了保护膜10。当然,塑料膜或片材并非必须包含5层,例如也可以只有一层,或者具有两层或更多层。
图2示出了根据本发明的漆顶层1的FT-IR光谱。实线表示在漆覆设到塑料片材上并且第一组成部分(在所示范例中为丙烯酸组分1~3)固化之后的漆顶层。然后,将该片材在70℃下预干燥24小时,以便去除塑料片材的残留水分。漆面漆的FT-IR光谱以虚线示出。在70℃/24小时情况下的存放之前测量的差异很小。
在片材的热成型(点划线)之后,FT-IR光谱显著变化,特别地,大约在900cm-1处,特征带的透射率明显更高。在第二组成部分固化后,漆面漆表面的物理-化学特性在此显著改善。令人惊讶的是,热固化作为塑料的漆顶层的最终固化步骤提供了与作为最终步骤的UV-固化相同的表面质量(物理和化学)。在塑料上的漆的热固化中,通常绝不会实现这样的结果。

Claims (9)

1.一种可热变形的片材或膜,包括热塑性塑料片材或塑料膜(2、3)和设置于其上的具有至少两种组成部分的漆顶层(1),其特征在于,所述漆顶层(1)具有作为第一组成部分的已经固化的可热成型的组分和作为第二组成部分的可热固化的组分,其中,已经固化的可热成型的组分是通过UV-光固化的组分,其中,所述可热固化的组分经过选取,从而它在所述热塑性塑料片材或塑料膜(2、3)可热成型的温度下固化。
2.如权利要求1所述的可热变形的片材或膜,其特征在于,通过UV-光固化的组分是聚合物,其包括丙烯酸酯低聚物、反应性稀释剂和光引发剂。
3.如权利要求2所述的可热变形的片材或膜,其特征在于,所述可热固化的组分包括封端的异氰酸酯和多元醇。
4.如权利要求3所述的可热变形的片材或膜,其特征在于,在漆顶层(1)上设置了保护膜(10)。
5.一种可变形的片材或膜,包括根据权利要求1~4中任一项所述的可热变形的片材或膜,其中,可热固化的组分固化。
6.一种构件,包括根据权利要求5的可变形的片材或膜。
7.如权利要求6所述的构件,其特征在于,所述构件是车身构件、卫生构件、家具构件或外壳。
8.一种用于制造根据权利要求1~4中任一项所述的可热变形的片材或膜的方法,包括如下步骤:
(i)提供热塑性的塑料片材或塑料膜(2、3);
(ii)涂覆具有可通过UV-光固化的第一组成部分和可热固化的第二组成部分的漆,第一组成部分在固化状态下可热塑性地变形,所述可热固化的组分经过选取,从而它在所述热塑性塑料片材或塑料膜(2、3)可热成型的温度下固化;
(iii)通过UV-光仅使得所述可固化的第一组成部分固化。
9.一种用于制造根据权利要求5的可变形的片材或膜的方法,其特征要么在于如下步骤:
(i)提供热塑性的塑料片材或塑料膜(2、3);
(ii)涂覆具有可通过UV-光固化的第一组成部分和可热固化的第二组成部分的漆,第一组成部分在固化状态下可热塑性地变形;
(iii)通过UV-光仅使得可固化的第一组成部分固化;
(iv)使得塑料片材或塑料膜热成型为所希望的三维形状,同时使得可热固化的组分固化;
要么在于如下步骤:
(a)提供根据权利要求1~4中任一项所述的可热变形的片材或膜;
(b)使得塑料片材或塑料膜热成型为所希望的三维形状,同时使得可热固化的组分固化。
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