CN102821941A - 由包含可发泡的反应性树脂的基材制成的泡沫和模制品 - Google Patents

由包含可发泡的反应性树脂的基材制成的泡沫和模制品 Download PDF

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CN102821941A
CN102821941A CN2011800157553A CN201180015755A CN102821941A CN 102821941 A CN102821941 A CN 102821941A CN 2011800157553 A CN2011800157553 A CN 2011800157553A CN 201180015755 A CN201180015755 A CN 201180015755A CN 102821941 A CN102821941 A CN 102821941A
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foam
mechanograph
base material
resin
melamine
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T·H·施泰克
H·褒姆伽特尔
K·哈恩
J-U·施尔霍尔兹
B·韦斯特尔
C·莫克
B·瓦特
P·尼塞尔
W·伦茨
D·A·冈萨雷斯
G·德勒辛德尔
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BASF SE
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Abstract

本发明涉及由发泡基材制成的泡沫和模制品,该基材选自聚氨酯树脂、聚酯树脂、环氧化物以及由矿物纤维、动物纤维、植物纤维和化学(天然/合成)纤维或其混合物构成的非织造织物、织造材料和开孔两维及三维网状物,且包含三聚氰胺/甲醛树脂作为可发泡的反应性树脂。

Description

由包含可发泡的反应性树脂的基材制成的泡沫和模制品
本发明涉及包含可发泡的三聚氰胺/甲醛树脂的基材的泡沫和模制品。
WO-A-2009/77616公开了其中基材例如由开孔泡沫,如开孔的三聚氰胺树脂泡沫、PIR(聚异氰脲酸酯)、聚酰亚胺泡沫或基于无机材料的泡沫构成的模制品。其中尤其已知的是其中基材为三聚氰胺树脂泡沫且可发泡的反应性树脂为聚氨酯树脂、聚酯树脂或环氧树脂的模制品。
然而,这类模制品仍有待提高。
因此,本发明目的为改进上述缺点。
因此,已经找到发泡基材的新型泡沫和模制品,该基材选自聚氨酯树脂、聚酯树脂、环氧化物及其混合物且包含三聚氰胺/甲醛树脂作为可发泡的反应性树脂。
基材与可发泡的反应性树脂的重量比通常为1-50重量%,优选5-30重量%,更特别的是10-20重量%。
适用于本发明泡沫和模制品的基材原则上为熟练技术人员已知且可用作载体、基质或台架的所有三维以及片状材料。它们原则上可呈任何所需形式或厚度。优选使用板状排列的片状基材,其中第三维(厚度)小于片状基材的第一维(长度)和第二维(宽度)。片状基材的长度和宽度可以是相同或不同的。
基材优选选自至少一种(可发泡的)聚氨酯树脂(PU树脂)、(可发泡的)聚酯树脂或(可发泡的)环氧树脂。更特别的是,基材为聚氨酯树脂。合适的聚氨酯树脂、聚酯树脂或环氧树脂是熟练技术人员已知的。这类树脂例如可在Encyclopedia of Polymer Science and Technology(Wiley)的以下章节中找到:a)Polyesters,unsaturated:第3版,第11卷,2004,第41-64页及随后各页;b)Polyurethanes:第3版,第4卷,2003,第26-72页及随后各页和c)Epoxy resins:第3版,第9卷,2004,第678-804页及随后各页。此外,Ullmann's Encyclopedia of Industrial Chemistry(Wiley)包含以下章节:a)Polyester resins,unsaturated:第6版,第28卷,2003,第65-74页及随后各页;b)Polyurethanes:第6版,第28卷,2003,第667-722页及随后各页和c)Epoxy resins:第6版,第12卷,2003,第285-303页及随后各页。
就本发明而言,聚氨酯树脂尤其为基于聚氨酯的树脂。它们主要由空气干燥油(甘油三酯,不饱和脂肪酸)获得,将其首先用甘油酯交换以产生甘油单酯和甘油二酯的混合物。然后使所得产物以≤1:1的异氰酸酯基与羟基的物质的量之比与二异氰酸酯,优选二异氰酸酯基甲苯反应,以产生不再含有任何异氰酸酯基且以与醇酸树脂相似的方式干燥并通过空气氧化固化的聚氨酯。或者,它们可由二异氰酸酯和用不饱和酸(如用妥儿油)部分酯化的多元醇(甘油、季戊四醇)制备。
就本发明而言,聚酯树脂优选为不饱和聚酯树脂。更特别的是,聚酯树脂为基于不饱和聚酯的反应性树脂,其由不饱和二元羧酸,如马来酸或富马酸,以及主要由二元醇,如乙二醇和丙烷-1,2-二醇制备,将其在施加过程中用聚合和交联固化以形成热固性材料。它们的制备可使用额外组分,如作为溶剂或稀释剂的可共聚的单体(苯乙烯、α-甲基苯乙烯、乙烯基甲苯、甲基丙烯酸甲酯等)、作为交联剂和固化剂(聚合引发剂,如过氧化物)的二官能团单体(如二乙烯基苯、邻苯二甲酸二烯丙酯)、促进剂、颜料、增塑剂、抗静电剂、填料和增强剂(基于有机物或无机物的纤维)。
就本发明而言,环氧树脂不仅优选为每分子具有超过一个环氧基,用于生产热固性材料的低聚化合物,而且优选为相应的热固性材料本身。将环氧树脂转变为热固性材料经由加聚反应用合适的固化剂或通过经由环氧基聚合而进行。环氧树脂优选通过双酚A(芳族二羟基化合物)与表氯醇在碱性介质中反应以形成链状化合物而生产。
聚合物泡沫优选为开孔的。为此,将常规的闭孔的泡沫后处理/网化。
网化为其中将泡沫材料的孔膜几乎完全除去的方法,其赋予泡沫几乎完美的开孔特性。
网化在钢腔中进行,其中整块泡沫堵塞,或在特定的滚筒反应器中,具有约1m直径的滚筒是封闭的。然后将空气抽出并由燃烧气体混合物替换。通过气体混合物的点燃,所得热量和压力波引起泡沫中最薄结构,即孔膜撕开并熔融至孔壁上,使后者变得更厚。由于网化,泡沫块的压缩强度降低约20%,但拉伸强度和伸长率值增加。
网化产生高的内部闭合温度,这类似于发泡后。因此,在网化后还需要冷却时间。网化泡沫具有实际上100%的开孔特性并因此表现出对气体或液体的最小流动阻力。最经常的应用为作为所有种类的过滤器。在本发明情况下,借助网化方法,将所选泡沫通过使其孔膨胀至每英寸孔20-40ppi的尺寸而增强。
网化方法的另一选择或额外的是,可通过在泡沫中机械加工除了在任何情况下存在于泡沫中的孔之外的孔或凹槽而降低泡沫密度。
其它合适的基材包括矿物纤维(如玻璃、矿物棉、玄武岩)、动物纤维(如丝、羊毛)、植物纤维(如棉)、由天然聚合物制成的化学纤维(如纤维素)和由合成聚合物制成的化学纤维(如聚酰胺(PA 6.6-商标名Nylon、PA 6.0-商标名Perlon)、聚酯(PET(聚对苯二甲酸乙二醇酯)、PBT(聚对苯二甲酸丁二醇酯))、PVC(聚氯乙烯)、PP(聚丙烯)、PE(聚乙烯)、PPS(聚苯硫醚)、PAN(聚丙烯腈)、PI(聚酰亚胺)、PTFE(聚四氟乙烯,Teflon)、芳族聚酰胺(间位芳族聚酰胺,商标名如Nomex,对位芳族聚酰胺,商标名如Kevlar)、聚酰胺酰亚胺(Kermel))(Ullmann′s Encyclopedia of Industrial Chemistry,第13章,Fibers,2003,第323-652页)。
优选非织造物和织造物以及由上述纤维构成的两维和三维的开孔网状物。
作为基材,还可使用上述纤维的纤维混合物。还可利用具有相同类型材料但密度和/或定量不同的纤维的多层稀布。还可使用不同种类的具有相同密度或不同密度以及具有相互或不同厚度的纤维的多层稀布。
由包含可发泡的反应性树脂的基材生产的泡沫也被称作混成泡沫。需要的话,也可将两种或更多种不同的可发泡的反应性树脂掺入基材。
适合作为可发泡的反应性树脂的为三聚氰胺/甲醛树脂,其中更优选三聚氰胺/甲醛树脂导致密度≤25g/l,即1.6-25g/l,优选2-15g/l,更优选3-23g/l,更特别的是4-12g/l,和/或孔径大小为10-1000μm,优选50-300μm的开孔泡沫。
用于三聚氰胺/甲醛树脂及其泡沫的生产方法例如由WO-A-01/94436已知。
本发明泡沫和模制品可如下生产:
1.制备包含待生产泡沫的预缩合物以及任选其它添加组分(Z)的溶液或分散体,
2.将可发泡的三聚氰胺/甲醛树脂引入基材中,
3.通过将来自步骤(2)的溶液或分散体加热至发泡剂沸点温度以上的温度而使基材中的预缩合物发泡,以获得泡沫,以及任选的是,优选
4.使步骤(3)中获得的泡沫干燥。
各方法步骤以及各变化可能性在下文中详述。
三聚氰胺-甲醛预缩合物的甲醛与三聚氰胺的摩尔比通常为5:1-1.3:1,优选3.5:1-1.5:1。
除了三聚氰胺之外,这些三聚氰胺/甲醛缩合产物可包含至多50重量%,优选至多20重量%其它热固性树脂前体,以及除了甲醛之外,至多50重量%,优选至多20重量%呈缩合形式的其它醛类。然而,优选未改性的三聚氰胺/甲醛缩合产物。
有用的热固性树脂前体例如包括烷基和芳基取代的三聚氰胺、脲、氨基甲酸乙酯、羧酰胺、双氰胺、胍、硫酰胺、磺酰胺、脂族胺、二元醇、酚及其衍生物。
有用的醛类例如包括乙醛、三羟甲基乙醛、丙烯醛、苯甲醛、糠醛、乙二醛、戊二醛、苯二醛和对苯二醛。关于三聚氰胺/甲醛缩合产物的其它细节在Houben-Weyl,Methoden der organischen Chemie,第14/2卷,1963,第319-402页中找到。
在另一优选实施方案中,三聚氰胺/甲醛预缩合物以55-85重量%,优选63-80重量%的量存在于混合物中。
在三聚氰胺/甲醛预缩合物的制备过程中,可加入醇类,如甲醇、乙醇或丁醇,以获得部分或完全酯化的缩合物。醚基的形成可用于影响三聚氰胺/甲醛预缩合物的溶解性以及完全固化材料的机械性。
可将阴离子、阳离子和非离子表面活性剂及其混合物用作分散剂/乳化剂。
有用的阴离子表面活性剂例如包括二苯醚磺酸盐、链烷基-和烷基苯磺酸盐、烷基萘磺酸盐、烯烃磺酸盐、烷基醚磺酸盐、脂肪醇硫酸盐、醚硫酸盐、α-磺基脂肪酸酯、酰基氨基链烷磺酸盐、酰基异硫代硫酸盐、烷基醚羧酸盐、N-酰基肌氨酸盐以及烷基和烷基醚磷酸盐。有用的非离子表面活性剂包括烷基酚聚二醇醚、脂肪醇聚二醇醚、脂肪酸聚二醇醚、脂肪酸链烷醇酰胺、氧化乙烯-氧化丙烯嵌段共聚物、氧化胺、甘油脂肪酸酯、脱水山梨糖醇酯和烷基多糖苷。有用的阳离子乳化剂例如包括烷基三铵盐、烷基苯甲基二甲基铵盐和烷基吡啶盐。
分散剂/乳化剂可基于三聚氰胺/甲醛预缩合物以0.2-5重量%的量加入。
分散剂/乳化剂和/或保护胶体原则上可在任何时间加入粗分散体中,但它们也可在引入微胶囊分散体时已存在于溶剂中。
作为固化剂,可使用催化三聚氰胺树脂的进一步缩合的酸性(酸)化合物。这些固化剂的量各自基于预缩合物通常为0.01-20重量%,优选0.05-5重量%。有用的酸性化合物包括有机和无机酸,例如选自盐酸、硫酸、磷酸、硝酸、甲酸、乙酸、草酸、甲苯磺酸、氨基磺酸、酸酐及其混合物。
取决于三聚氰胺/甲醛预缩合物的选择,混合物包含发泡剂。混合物中发泡剂的量通常取决于泡沫所需密度。
原则上,本发明方法可使用物理和化学发泡剂(Encyclopedia ofPolymer Science and Technology,第I卷,第3版,Additives,第203-218页,2003)。
“物理”或“化学”发泡剂是合适的。“物理”发泡剂此处为通过物理处理(如温度、压力)获得其发泡剂性能的挥发性液体或压缩气体。“化学”发泡剂此处为通过化学反应或化学降解并释放气体而获得其发泡剂性能的发泡剂。
有用的“物理”发泡剂例如包括呈液体形式的烃类,如戊烷、己烷,卤化,更特别的是氯化和/或氟化的烃,如二氯甲烷、氯仿、三氯乙烷、氢氯氟化碳、部分卤化的氢氯氟烃(H-CFC),醇类,如甲醇、乙醇、正丙醇、异丙醇,醚类,酮类和酯类,如甲酸甲酯、甲酸乙酯、乙酸甲酯或乙酸乙酯,或作为气体的空气、氮气或二氧化碳。
有用的“化学”发泡剂例如包括混有水的异氰酸盐,其释放二氧化碳作为活性发泡剂。进一步可使用混有酸的碳酸盐和碳酸氢盐,在该情况下又产生二氧化碳。偶氮化合物,如偶氮二甲酰胺也是合适的。
在本发明的优选实施方案中,混合物进一步包含至少一种发泡剂。该发泡剂以基于三聚氰胺/甲醛预缩合物0.5-60重量%,优选1-40重量%,更优选1.5-30重量%的量存在于混合物中。优选加入沸点为0-80℃的物理发泡剂。
在另一实施方案中,除了待生产泡沫的三聚氰胺-甲醛预缩合物和纳米颗粒之外,混合物还包含乳化剂以及任选固化剂和任选发泡剂。
在另一实施方案中,混合物不含其它添加的物质。然而,为此有利的是,可加入基于三聚氰胺/甲醛预缩合物0.1-20重量%,优选0.1-10重量%常规添加物质,如染料、阻燃剂、UV稳定剂、用于降低易燃气体毒性或促进碳化的试剂。
还可将添加物质加入三聚氰胺/甲醛预缩合物中。在一个实施方案中,耐磨泡沫包含至少一种选自染料、香料、荧光增白剂、UV吸收剂和颜料的添加物质。该添加物质优选在泡沫中均匀分布。
有用的颜料包括普通的无机天然颜料(如白垩)或合成颜料(如二氧化钛),以及有机颜料。
可通过熟练技术人员已知的任何方法,如通过用可发泡的反应性树脂浸渍基材而将可发泡的反应性树脂引入(步骤2)基材中。或者,也可将基材(表面)用可发泡的反应性树脂喷雾,以及需要的话,随后滚压入基材中(WO-A-2009/077616)。通常将可发泡的反应性树脂非常均匀地施加。可进行本发明方法,以使基材完全浸入包含可发泡的反应性树脂的浸渍溶液中,或仅将基材扁平侧浸入。
在一个优选实施方案中,可优选分批生产开孔泡沫和三聚氰胺/甲醛树脂泡沫的组合。
为此,在具有可变压力设置的发泡设备中,可将包含来自步骤(1)的预缩合物的溶液或分散体与基材组合。可存在不同组合:
1.引入基材并将可发泡的反应性树脂非常均匀地施加
2.将基材用可发泡的反应性树脂浸渍,然后放置在泡沫模具中
3.首先引入三聚氰胺/甲醛树脂,然后加入基材。
在另一优选实施方案中,基材与三聚氰胺/甲醛树脂泡沫的组合可优选以连续方法生产。
存在不同的组合基材和三聚氰胺/甲醛树脂的方式。可经由连续滚筒将基材供料至发泡设备。可将基材预先压缩,并因此在用三聚氰胺/甲醛树脂发泡时,基材达到完全泡沫重量(即基材的初始厚度)。此外,可使基材在发泡时膨胀,以使其沿着发泡方向撕裂并因此失去初始的复合结构。
1.可经由发泡设备底部供应基材。例如可使用触摸闭合胶带将基材连接在发泡设备的下侧。可从上面将稀浆施加至基材。
2.可将基材在三聚氰胺/甲醛树脂之前导入发泡设备中,以使三聚氰胺/甲醛树脂能够在发泡操作中渗入基材(并膨胀)。
3.可将三聚氰胺/甲醛树脂直接注入基材中并滚压。滚压例如可除去过量的可发泡反应性树脂,直至所需量的可发泡反应性树脂存在于基材中。
在方法步骤(3)中,为使预缩合物以及存在的话基材发泡,进行加热。通过将来自步骤(2)的溶液或分散体加热至所用发泡剂沸点以上的温度,可获得泡沫。用于施加的精确温度尤其取决于所用发泡剂(如其沸点)。步骤(3)中的加热例如可通过使用热气体(如空气或惰性气体)和/或通过高频辐照(如微波)进行。
能量可优选通过电磁辐照,如通过每kg所用混合物5-400kW,优选5-200kW,更优选9-120kW的高频辐照,以0.2-100GHz,优选0.5-10GHz的频率引入。适用于电解质辐照的辐照源为磁控管,在该情况下辐照可在一个或多个磁控管下同时进行。
总之,将所产生泡沫干燥,除去残留在泡沫中的发泡剂和水。
以这种操作产生的混成泡沫的性能由所用可发泡的三聚氰胺-甲醛树脂与基材的设定密度得出。
根据本发明生产的三聚氰胺树脂泡沫的密度通常为5-100g/l,更优选10-50g/l。
混成泡沫还可进一步包含添加剂。合适添加剂的实例包括阻燃剂,如膨胀性材料、碱金属硅酸盐、三聚氰胺、三聚氰胺聚磷酸盐、三聚氰胺氰尿酸盐、氢氧化铝、氢氧化镁、聚磷酸铵、有机磷酸盐或阻燃的卤素化合物。同样适合的添加剂为增塑剂,成核剂,IR吸收剂如碳黑和石墨,氧化铝粉末或Al(OH)3,可溶和不溶的着色剂,杀菌物质(如杀真菌剂)和颜料。
需要的话,也可将混成泡沫用其它有机或无机颗粒增强。这类颗粒优选以与可发泡的反应性树脂的共混物引入。合适增强填料的实例包括以下:短玻璃纤维、白垩或其它矿物质、纳米管、页硅酸盐或碳纤维。可将它们加入基材本身。
已经发现本发明三聚氰胺树脂泡沫在以下领域中的应用:座位减震领域;建筑物和建筑物构件,更特别的是,墙壁、隔板、屋顶、外观、门、天花板和地板中的热、冷和/或声音保护或绝缘/密封;在陆地、水上、空中和太空中,无论用于运输货物还是人的任何类型交通工具,或在客车、卡车中的任何这类组合中,例如用于密封发动机舱(如发动机罩)或乘客舱;在轨道交通、轨道车和货物或乘客运输中,以及在机车中,在飞行器中,例如用于座舱内部、飞机座舱或货舱中;以及在太空旅行中,在载人或无人飞行物体如航天飞船和航天滑翔器、太空舱或卫星中,例如用于冷却装置,冰箱,冷库,用于任何所需液体,更特别的是,用于低至(-278℃)的油和气体或液体的储罐系统和容器的低温绝缘,用于存储和运输,用于作为“海绵”吸收以及完全或部分逆向释放低至(-273℃)的液体;在用于表面清洗的清洗工业中,例如以用任何种类的清洁剂饱和的海绵形式,尤其用于(全)自动洗涤设备的洗涤操作;用作减震或隔震包装材料;用于卫生用途(纸尿裤、卫生巾)以及用于纺织领域(服装)。
三聚氰胺/甲醛树脂泡沫在卫生领域中的应用实例例如在WO-A-02/26872和WO-A-02/26871中找到。
在本发明方法的一个特定实施方案中,可使包含可发泡的反应性树脂的基材(混成泡沫)经受压缩变形。三聚氰胺树脂泡沫的热引发变形已经由中EP-A-111 860已知。
用于由开孔、有弹性的热固性泡沫生产三维形状制品的方法,其中:
a)将泡沫在100-180℃的温度下用水沸腾或用蒸汽处理0.1-120分钟,然后在20-280℃下,在0.1-100巴压力下变形,或
b)使泡沫在1.5-15巴的压力下变形,然后在变形状态下,在100-180℃的温度下用蒸汽处理0.1-60分钟。
就本发明而言,术语“压缩变形”或“压缩变形步骤”指在升高的压力和升高的温度下处理包含可发泡的反应性树脂的基材(混成泡沫)。使用熟练技术人员已知且优选可加热的合适模具,其形状决定了待生产模制品的形状。此处例如可使用所谓的镶块或具有特定形状表面的模具,以生产具有广泛变化的不同外观和/或厚度的工件(模制品)。
升高的压力是指大于大气压力的任何压力(1巴)。根据本发明,该步骤通常通过将所获得的包含可发泡的反应性树脂的基材嵌入合适模具中,然后施加压力而进行。在本发明的一个优选实施方案中,压缩变形步骤在升高的温度下进行。在该优选实施方案中,也将其称作热成型步骤。此处原则为步骤中所用温度越高,则包含可发泡的反应性树脂的基材在模具中的停留时间就越短。
压缩变形优选在50-200℃的温度下和/或2-200巴的压力下进行。取决于所用体系,所完成的模制品可在数分钟后,如在0.5-2分钟后取出。需要的话,压缩变形步骤也可进行较长时间。
模制品通常为可用模具生产的任何尺寸、范围和形状的模制品,如星型、球形、立方体、长方体、环形、圆柱体、中空圆柱体、半壳、挤出物,例如意欲用于外壳、垫子、转子、用于飞行器和太空运载工具的机翼和机身,用于汽车、卡车、公共汽车和任何种类杂用车中乘客舱及其内部装饰,以及优选为片状模制品,即其中第三维(厚度)小于第一维(长度)和第二维(宽度)的那些模制品。
本发明进一步提供了包含这类模制品的面板,以及这些模制品和面板在交通工具构造,包括飞行器构造、铁路构造中或作为防火层,更特别的是,作为轻量组件的用途。
所得模制品的物理性能取决于压缩程度、所用基材、所用可发泡的反应性树脂以及反应性树脂在基材中的分数。可产生具有实际上不受限制的性能范围的部件。
模制品可以可自动化的方式生产,且通常具有较好的机械性能。因此,值得注意的是本发明泡沫和模制品的高压缩强度和抗撕裂延展性,以及高且稳定的可变形性。此外,它们具有低密度和轻量以及低的燃烧性,且因此可用作防火层。本发明模制品的特定优势的原因为经由本发明方法,它们能够轻易地呈任何所需形式且同时该形式非常稳定。
由于压缩变形步骤,所完成(如扁平)模制品的厚度通常小于或几乎等于所用基材的厚度。与所用基材厚度相比,压缩变形后模制品的厚度优选≤80%。在本发明的一个实施方案中,可将所完成模制品的厚度降低至所用基材厚度的10-50%。
在压缩变形之前或之后,优选在其之前,在本发明的一个实施方案中,可将外层施加至包含可发泡的反应性树脂的基材的至少一(扁平)侧。当外层在压缩变形之前施加时,将其施加至包含可发泡的反应性树脂的基材(混成泡沫)的一个或多个(扁平)侧(表面)。当外层在压缩变形之后施加时,将其施加至所完成模制品的一侧(表面)。优选将外层各自施加至包含可发泡的反应性树脂的基材的两个相对(扁平)侧。在该情况下所述材料可为相同材料或不同材料。需要的话,可将两个或更多个外层施加至混成泡沫或所完成模制品的至少一侧或两个相对侧。将在包含可发泡的反应性树脂的基材的至少一侧(表面)上具有外层的本发明模制品称作面板。当在包含可发泡的反应性树脂的基材的两个相对侧上均存在外层时,可使用术语夹心板。
原则上熟练技术人员已知的所用外层均适合作为外层。外层优选全部或至少部分由以下构成:金属,更特别的是铝,木材、绝缘材料、例如呈聚合物膜或塑料片形式的塑料、波纹金属片、其它金属片、玻璃纤维织物、玻璃纤维垫、石膏或刨花板。如果使用木材外层,则优选由胶合板构成;塑料外层还包括聚氨酯泡沫。外层更优选为铝、金属片、玻璃纤维织物、聚合物膜、塑料片或胶合板,特别优选铝。外层优选为箔/膜、玻璃纤维垫或两者均有。
优选在已将材料压平之后将外层施加至包含可发泡的反应性树脂的基材上,外层厚度优选小于基材厚度,优选小至少10倍。合适的外层例如为0.1mm厚的铝箔。在压缩变形的随后步骤中,优选将包含至少一个外层的模制品压缩至基材初始厚度的≤80%。混成泡沫和外层之间的粘性通常得自在压缩过程中从泡沫中挤出的可发泡的反应性树脂。
本发明进一步提供了一种包含至少一种可通过上述方法生产的本发明模制品的面板。就本发明而言,术语“面板”更特别的是指具有模制品(核)且在所述模制品上,在至少一个(扁平)侧上施加外层的那些制品。面板可为直的(未弯曲)或可具有一个(或需要的话两个或更多个点的)曲度(弯曲)。此外,面板也可有纹理。面板优选为夹心板,其中将外层施加至模制品的各相对(扁平)侧。合适的外层已经在上文中列出。需要的话,两个外层可为不同材料,但优选相同材料。更特别的是,两个外层选自铝、金属片、玻璃纤维织物、玻璃纤维垫、聚合物膜、塑料片或胶合板。
本发明进一步提供了一种生产这类包含至少一种本发明模制品的面板的方法。生产面板的方法原则上相应于上述生产本发明模制品的方法。
在模制品变形和固化过程中,不仅在外层和泡沫核之间产生摩擦连接,而且外层也可与泡沫核一起变形。
本发明进一步提供了本发明(扁平)模制品在运输工具构造或作为防火层的用途。本发明模制品优选用于交通工具构造中,更特别是用于汽车、卡车和公共汽车以及用于农业、林业和建筑机械,用于飞行器如飞机和飞船,用于飞行器和太空运载工具的构造或轨道交通工具如铁路的构造中。与本发明模制品在交通工具构造中的用途相关的特定优势在以基于生产方法的简单方式,尤其是通过热成型步骤将所述模制品变形为任何所需形状的可能性方面具有基础。这些形状又是高稳定性的,具有突出的机械性能,且还具有低的可燃性。本发明进一步提供了包含本发明模制品的面板在交通工具构造,更特别的是在飞行器或铁路中,或作为防火层的用途。
此外,本发明泡沫和模制品可作为吸声面板用于建筑中。此外,在包装领域中本发明泡沫适用于能量吸收。
实施例:
实施例1:
用聚酯(PET)纤维非织造物改性的泡沫的生产
将75重量份喷雾干燥的三聚氰胺/甲醛预缩合物(摩尔比例1:3)溶于25重量份水中。将该树脂溶液与在各情况下基于树脂3重量%甲酸、2重量%C12/C14烷基硫酸钠和20重量%戊烷混合。
将聚酯纤维非织造物(密度为800g/m2,基于树脂25重量%)用含水的三聚氰胺/甲醛混合物浸渍,然后通过注入微波能量在聚丙烯(发泡)模具中发泡。发泡之后,干燥30分钟。
结果总结在表1中。
实施例2:
用网化PU泡沫改性的泡沫的生产
将75重量份喷雾干燥的三聚氰胺/甲醛预缩合物(摩尔比例1:3)溶于25重量份水中。将该树脂溶液与在各情况下基于树脂3重量%甲酸、2重量%C12/C14烷基硫酸钠和20重量%戊烷混合。
将含水的三聚氰胺/甲醛树脂混合物引入聚丙烯(发泡)模具中,然后将开孔的PU泡沫(密度为30g/l)放置在稀浆上。发泡通过注入微波能量进行。发泡之后,干燥30分钟。
结果总结在表1中。
对比例A:
将75重量份喷雾干燥的三聚氰胺/甲醛预缩合物(摩尔比例1:3)溶于25重量份水中。将该树脂溶液与在各情况下基于树脂3重量%甲酸、2重量%C12/C14烷基硫酸钠和20重量%戊烷混合。然后将混合物搅拌并通过注入微波能量在聚丙烯(发泡)模具中发泡。发泡之后,干燥30分钟。
结果总结在表1中。
表1
Figure BDA00002187385800121
冲压测量:
三聚氰胺树脂的机械质量通过根据US-A-4 666 948进行的冲压测量评估。对于该测量,将直径为8mm,高度为10cm的圆柱状锤体在发泡方向上以90°角压入直径为11cm,高度为5cm的圆柱状样品中,直至样品撕裂。撕裂力[N/kN]提供了关于泡沫质量的信息。

Claims (7)

1.包含三聚氰胺/甲醛树脂作为可发泡的反应性树脂的基材的泡沫和模制品。
2.根据权利要求1的泡沫和模制品,其中将聚氨酯树脂、聚酯树脂、环氧化物或其混合物用作基材。
3.根据权利要求1的泡沫和模制品,其中将矿物纤维、动物纤维、植物纤维和化学天然或合成纤维以及包含这些纤维的非织造物和织造材料用作基材。
4.一种生产根据权利要求1-3中任一项的泡沫和模制品的方法,其中将可发泡的反应性树脂引入基材中并在发泡剂沸点温度以上的温度下发泡,且任选进行热处理。
5.根据权利要求1-4中任一项的泡沫和模制品作为减震品以及在热、冷和声音保护中的用途。
6.根据权利要求1-4中任一项的泡沫和模制品在对汽车、卡车、公共汽车的交通工具构造中、在农业和建筑机械中、在轨道交通工具中以及在飞行器和太空运载工具构造中的用途。
7.根据权利要求1-4中任一项的泡沫和模制品在对汽车、卡车、公共汽车的交通工具构造中、在农业和建筑机械中、在轨道交通工具中以及在飞行器和太空运载工具构造中的面板中的用途。
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