CN108884253A - 具有聚酰胺嵌段和聚醚嵌段的共聚物泡沫 - Google Patents

具有聚酰胺嵌段和聚醚嵌段的共聚物泡沫 Download PDF

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CN108884253A
CN108884253A CN201780008391.3A CN201780008391A CN108884253A CN 108884253 A CN108884253 A CN 108884253A CN 201780008391 A CN201780008391 A CN 201780008391A CN 108884253 A CN108884253 A CN 108884253A
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copolymer
polyamide
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克莱奥·科克特
昆廷·皮尼奥
卡琳娜·洛伊恩
弗朗索瓦·费尔南古特
海伦纳·凯米奈特
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Abstract

本发明涉及具有聚酰胺嵌段和聚醚嵌段的非交联共聚物泡沫,其中:所述共聚物的聚酰胺嵌段的平均摩尔质量为200g/mol至1500g/mol;所述共聚物的聚醚嵌段的平均摩尔质量为800g/mol至2500g/mol;并且所述共聚物的聚酰胺嵌段与聚醚嵌段的重量比为0.1至0.9。本发明还涉及用于制造所述泡沫的方法以及由所述泡沫制造的物品。

Description

具有聚酰胺嵌段和聚醚嵌段的共聚物泡沫
发明领域
本发明涉及由聚酰胺聚醚嵌段共聚物形成的泡沫以及其制造方法。
技术背景
各种聚合物泡沫特别地用于运动装备的领域,例如鞋底或鞋底组件、手套、球拍或高尔夫球、个人防护元件,尤其是用于运动练习(背心、内部头盔或船体部件...)。
此类应用需要一系列特定的物理性质,以确保回弹的能力、低压缩形变以及经受反复的冲击而不变形并且在之后恢复初始形状的能力。
文件EP 0405227和EP 0402883公开了由各种聚合物制造的泡沫及其在鞋底中的用途。
文件EP 1650255公开了由聚酰胺聚醚嵌段共聚物获得的交联泡沫。
就制造方法而言,交联泡沫具有表现出显著限制条件的缺点:通常制造时间长,通常制造必须仅以间歇模式进行,并且必须处理不期望的化学产物。
另外,交联泡沫在使用后难以再循环。
文件WO 2013/148841公开了各种聚合物(包括聚酰胺聚醚嵌段共聚物)的双层挤出方法。
文件WO 2015/052265公开了由任何热塑性弹性体聚合物制造膨胀的热塑性颗粒的方法。
此外,Zotefoams公司出售名称为ZOTEK@PEBA的由聚酰胺聚醚嵌段共聚物制造的交联泡沫。上文已经提及了交联的缺点。另外,产物的耐久性尚不完善。
还存在多种由热塑性聚氨基甲酸酯(TPU)或乙烯-乙酸乙烯酯(EVA)制造的泡沫。这些泡沫具有相对受限的操作温度范围,以及相对低的在相对短时间内的压缩形变,以及不完善的耐久性。它们的制造方法也是受限的。
因此需要提供具有一个或多个以下有利性质的低密度聚合物泡沫:在低的约束应力下恢复弹性能量的高能力;低的压缩形变;以及对压缩疲劳的高抗性。
发明概述
本发明首先涉及非交联聚酰胺聚醚嵌段共聚物的泡沫,其中:
-共聚物的聚酰胺嵌段的数均分子量为200g/mol至1500g/mol;
-共聚物的聚醚嵌段的数均分子量为800g/mol至2500g/mol;以及
-共聚物的聚酰胺嵌段与聚醚嵌段的质量比为0.1至0.9。
根据一个实施方案:
-共聚物的聚酰胺嵌段的数均分子量为400g/mol至1000g/mol,优选为600g/mol至850g/mol;
-共聚物的聚醚嵌段的数均分子量为1000g/mol至2000g/mol;以及
-共聚物的聚酰胺嵌段与聚醚嵌段的质量比为0.3至0.6。
根据一个实施方案,共聚物的聚酰胺嵌段是聚酰胺11的嵌段、或聚酰胺12的嵌段、或聚酰胺6的嵌段、或聚酰胺6.10的嵌段。
根据一个实施方案,共聚物的聚醚嵌段是聚乙二醇的嵌段或聚四氢呋喃的嵌段。
根据一个实施方案,泡沫的密度为小于或等于800kg/m3,优选为小于或等于600kg/m3,更特别优选为小于或等于400kg/m3,或者甚至小于或等于300kg/m3
根据一个实施方案,泡沫还含有一种或多种添加剂,优选地选自乙烯和乙酸乙烯酯的共聚物,乙烯和丙烯酸酯的共聚物,以及乙烯和烷基(甲基)丙烯酸酯的共聚物。
本发明还涉及制造这种泡沫的方法,包括将熔融状态的共聚物与膨胀剂并任选地与一种或多种添加剂混合的步骤,以及将共聚物与膨胀剂的混合物发泡的步骤。
在一个实施方案中,膨胀剂是物理膨胀剂,优选地选自双氮、二氧化碳、烃、氯氟烃、氢氯烃、氢氟烃和氢氯氟烃。
根据一个实施方案,所述方法包括将共聚物与膨胀剂的混合物注入模具中的步骤,其中通过开启模具来进行混合物的发泡。
本发明还涉及由以上泡沫组成的制品。
本发明还涉及包含至少一个由以上泡沫组成的元件的制品。
根据一个实施方案,本发明的制品选自运动鞋的鞋底、球、手套、个人防护装备、轨道衬垫、汽车部件、建筑部件以及电气和电子装备的部件。
本发明使得克服现有技术的缺点成为可能。更具体地,本发明提供了具有一个或多个以下有利性质的低密度聚合物泡沫:在低的约束应力下恢复弹性能量的高能力;低的压缩形变;以及对压缩疲劳的高抗性。
有利地,在宽的温度范围内,优选-20℃至50℃,或者甚至-30℃至80℃,获得这些性质。
这通过使用非交联的聚酰胺聚醚嵌段共聚物来实现,特征在于聚酰胺嵌段和聚醚嵌段的特定的分子量范围,以及聚酰胺嵌段与聚醚嵌段的特定的质量比。
附图简述
图1示出了对本发明的泡沫和对照泡沫进行疲劳测试后的压缩形变的测量结果(参见实施例2)。横坐标示出了弛豫时间(以小时计),并且在纵坐标表明了残余变形的百分比。
具体实施方式
本发明现在将更详细地进行描述,并且不限于以下描述。
本发明使用聚酰胺聚醚嵌段共聚物或“PEBA”。
PEBA由具有反应性末端的聚酰胺嵌段与具有反应性末端的聚醚嵌段的缩聚反应产生,除了其他以外,例如以下缩聚反应:
1)具有二胺链末端的聚酰胺嵌段与具有二羧基链末端的聚氧化烯嵌段的缩聚反应;
2)具有二羧基链末端的聚酰胺嵌段与具有二胺链末端的聚氧化烯嵌段的缩聚反应,所述具有二胺链末端的聚氧化烯嵌段例如通过被称为聚醚二醇的脂肪族聚氧化烯α,ω-二羟基化嵌段的氰乙基化和氢化来获得;
3)具有二羧基链末端的聚酰胺嵌段与聚醚二醇的缩聚反应,在这种特定情况下,所获得的产物是聚醚酯酰胺。
具有二羧基链末端的聚酰胺嵌段来自,例如,聚酰胺前体在二羧酸链限制剂存在下的缩合反应。具有二胺链末端的聚酰胺嵌段来自,例如,聚酰胺前体在二胺链限制剂存在下的缩合反应。
可以有利地使用三种类型的聚酰胺嵌段。
根据第一种类型,聚酰胺嵌段来自二羧酸与脂肪族或芳香族二胺的缩合反应,所述二羧酸特别是具有4个至20个碳原子的那些二羧酸,优选具有6个至18个碳原子的那些二羧酸,所述脂肪族或芳香族二胺特别是具有2个至20个碳原子的那些脂肪族或芳香族二胺,优选具有6个至14个碳原子的那些脂肪族或芳香族二胺。
作为二羧酸的实例,可以提及1,4-环己基二甲酸、丁二酸、己二酸、壬二酸、辛二酸、癸二酸、十二烷二羧酸、十八烷二羧酸以及对苯二甲酸和间苯二甲酸,以及二聚的脂肪酸。
作为二胺的实例,可以提及四亚甲基二胺、六亚甲基二胺、1,10-十亚甲基-二胺、十二亚甲基二胺、三甲基六亚甲基二胺,双-(4-氨基环己基)-甲烷(BACM)、双(3-甲基-4-氨基环己基)甲烷(BMACM)和2-2-双(3-甲基-4-氨基环己基)丙烷(BMACP)、对-氨基-二-环己基甲烷(PACM)、异佛尔酮二胺(IPDA)、2,6-双(氨基甲基)-降冰片烷(BAMN)和哌嗪(PIP)的异构体。
有利地,使用聚酰胺嵌段PA 4.12、PA 4.14、PA 4.18、PA 6.10、PA 6.12、PA 6.14、PA 6.18、PA 9.12、PA 10.10、PA 10.12、PA 10.14和PA 10.18。在符号PA X.Y中,X表示来自二胺残基的碳原子数,并且Y表示以常规方式来自二酸残基的碳原子数。
根据第二种类型,聚酰胺嵌段由具有6至12个碳原子的一种或多种α,ω-氨基羧酸和/或一种或多种内酰胺在具有4个至12个碳原子的二羧酸或二胺存在下的缩合反应产生。作为内酰胺的实例,可以提及己内酰胺、庚内酰胺和月桂基内酰胺。作为α,ω-氨基羧酸的实例,可以提及氨基己酸、氨基-7-庚酸、氨基-11-十一烷酸和氨基-12-十二烷酸。
有利地,第二种类型的聚酰胺嵌段是PA 11(聚十一烷酰胺)、PA 12(聚十二烷酰胺)或PA 6(聚己内酰胺)的嵌段。在符号PA X中,X表示来自氨基酸残基的碳原子数。
根据第三种类型,聚酰胺嵌段由至少一种α,ω-氨基羧酸(或内酰胺)、至少一种二胺和至少一种二羧酸的缩合反应产生。
在这种情况下,聚酰胺PA嵌段通过以下的缩聚反应来制备:
-具有X个碳原子的直链脂肪族或芳香族二胺;
-具有Y个碳原子的二羧酸或酸;以及
-选自具有Z个碳原子的内酰胺和α,ω-氨基羧酸的共聚单体{Z}以及至少一种具有X1个碳原子的二胺与至少一种具有Y1个碳原子的二羧酸的等摩尔混合物,其中(X1,Y1)不同于(X,Y),
-相对于全部聚酰胺前体单体,以有利地多至50%、优选多至20%、甚至更有利地多至10%的重量比引入所述共聚单体{Z};
-在选自二羧酸的链限制剂存在下。
有利地,将相对于二胺的化学计量过量引入的具有Y个碳原子的二羧酸用作链限制剂。
根据这种第三种类型的变体,聚酰胺嵌段由具有6个至12个碳原子的至少两种α,ω-氨基羧酸或至少两种内酰胺或者不具有相同碳原子数的内酰胺和氨基羧酸在可能存在链限制剂下的缩合反应产生。作为脂肪族α,ω-氨基羧酸的实例,可以提及氨基己酸、氨基-7-庚酸、氨基-11-十一烷酸和氨基-12-十二烷酸。作为内酰胺的实例,可以提及己内酰胺、庚内酰胺和月桂基内酰胺。作为脂肪族二胺的实例,可以提及六亚甲基二胺、十二亚甲基-二胺和三甲基六亚甲基二胺。作为脂环族二酸的实例,可以提及1,4-环己基二甲酸。作为脂肪族二酸的实例,可以提及丁二酸、己二酸、壬二酸、辛二酸、癸二酸、十二烷二甲酸和二聚的脂肪酸。这些二聚的脂肪酸优选具有至少98%的二聚体含量;它们优选地被氢化;例如,其为“CRODA”公司以商品名“PRIPOL”出售的产品,或者BASF公司以商品名EMPOL出售的产品,或者OLEON公司以商品名Radiacid出售的产品,以及聚氧化烯α,ω-二酸。作为芳香族二酸的实例,可以提及对苯二甲酸(T)和间苯二甲酸(I)。作为脂环族二胺的实例,可以提及双(4-氨基环己基)甲烷(BACM)、双(3-甲基-4-氨基环己基)甲烷(BMACM)和2-2-双-(3-甲基-4-氨基环己基)丙烷(BMACP)、以及对-氨基-二-环己基甲烷(PACM)的异构体。其他常用的二胺可以是异佛尔酮二胺(IPDA)、2,6-双(氨基甲基)-降冰片烷(BAMN)和哌嗪。
作为第三种类型的聚酰胺嵌段的实例,可以提及以下:
-PA 6.6/6,其中6.6表示与己二酸缩合的六亚甲基二胺单元,并且6表示由己内酰胺的缩合产生的单元;
-PA 6.6/6.10/11/12,其中6.6表示与己二酸缩合的六亚甲基二胺,6.10表示与癸二酸缩合的六亚甲基二胺,11表示由氨基十一烷酸的缩合产生的单元,并且12表示由月桂基内酰胺的缩合产生的单元。
符号PA X/Y、PA X/Y/Z等涉及共聚酰胺,其中X、Y、Z等表示如以上所述的均聚酰胺单元。
有利地,用于本发明的共聚物的聚酰胺嵌段包含聚酰胺嵌段PA 6、PA 11、PA 12、PA 5.4、PA 5.9、PA 5.10、PA 5.12、PA 5.13、PA 5.14、PA 5.16、PA 5.18、PA 5.36、PA 6.4、PA 6.9、PA 6.10、PA 6.12、PA 6.13、PA 6.14、PA 6.16、PA 6.18、PA 6.36、PA 10.4、PA10.9、PA 10.10、PA 10.12、PA 10.13、PA 10.14、PA 10.16、PA 10.18、PA 10.36、PA 10.T、PA 12.4、PA 12.9、PA 12.10、PA 12.12、PA 12.13、PA 12.14、PA 12.16、PA 12.18、PA12.36、PA 12.T、或其混合物或共聚物;并且优选地包含聚酰胺嵌段PA 6、PA 11、PA 12、PA6.10、PA 10.10、PA 10.12、或其混合物或共聚物。
聚醚嵌段由氧化烯单元组成。
聚醚嵌段可以特别地为PEG(聚乙二醇)嵌段,即,由环氧乙烷单元组成;和/或PPG(丙二醇)嵌段,即,由环氧丙烷单元组成;和/或PO3G(聚三亚甲基二醇)嵌段,即,由二醇聚三亚甲基醚单位组成,和/或PTMG嵌段,即,由四亚甲基二醇单元(也称为聚四氢呋喃单元)组成。PEBA共聚物可以在其链中包含若干类型的聚醚,其中共聚醚可以是嵌段或统计的。
还有可能使用通过双酚(例如,双酚A)的乙氧基化获得的嵌段。这些后面的产品特别地描述于文件EP 613919中。
聚醚嵌段也可以由乙氧基化的伯胺组成。作为乙氧基化的伯胺的实例,可以提及下式的产物:
其中,m和n是1至20的整数,并且x是8至18的整数。这些产物例如可从CECA公司以商品名商购获得,以及可从CLARIANT公司以商品名商购获得。
柔性聚醚嵌段可以包含具有NH2链末端的聚氧化烯嵌段,其中此类嵌段可以通过被称为聚醚二醇的脂肪族α,ω-二羟基化聚氧化烯嵌段的氰基乙酰基化来获得。更具体地,可以使用商品Jeffamine或Elastamine(例如D400、D2000、ED 2003、XTJ 542、Huntsman商品,也描述于文件JP 2004346274、JP 2004352794和EP 1482011中)。
将聚醚二醇嵌段原样使用并且与具有羧基末端的聚酰胺嵌段共聚缩合,或者被胺化以转化成聚醚二胺并且与具有羧基末端的聚酰胺嵌段缩合。两步制备在PA嵌段与PE嵌段之间具有酯键的PEBA共聚物的一般方法是已知的,并且在例如文件FR 2846332中进行了描述。制备在PA嵌段与PE嵌段之间具有酰胺键的本发明的PEBA共聚物的一般方法是已知的,并且在例如文件EP 1482011中进行了描述。聚醚嵌段也可以与聚酰胺前体和二酸链限制剂混合以制备含有具有统计学分布单元的聚酰胺嵌段和聚醚嵌段的聚合物(一步方法)。
当然,本发明描述中的PEBA名称还涉及由Arkema出售的出售的由EMS出售的由Sanyo出售的PEBA类型,或者来自其他供应商的任何其他PEBA。
如果以上所述的嵌段共聚物一般包含至少一种聚酰胺嵌段和至少一种聚醚嵌段,则本发明也涵盖包含两种、三种、四种(或甚至更多种)不同嵌段(其选自本说明书中描述的那些嵌段)的所有共聚物合金,因为这些嵌段包含至少聚酰胺和聚醚嵌段。
例如,本发明的共聚物合金可以包含含有三种不同类型的嵌段(或“三嵌段”)的嵌段分段共聚物,其由若干以上所述嵌段的缩合产生。所述三嵌段优选地选自共聚醚酯酰胺和共聚醚酰胺-氨基甲酸酯。
在本发明的上下文中特别优选的PEBA共聚物是包含以下嵌段的共聚物:
-PA 11和PEG;
-PA 11和PTMG;
-PA 12和PEG;
-PA 12和PTMG;
-PA 6.10和PEG;
-PA 6.10和PTMG;
-PA 6和PEG;
-PA 6和PTMG。
本发明的泡沫包含例如以上所述的PEBA共聚物,其中优选地仅使用一种此类共聚物。然而,有可能使用两种或多于两种以上所述的PEBA共聚物的混合物。
根据本发明,PEBA共聚物中的聚酰胺嵌段的数均分子量为200g/mol至1500g/mol;聚醚嵌段的数均分子量为800g/mol至2500g/mol;并且共聚物的聚酰胺嵌段与聚醚嵌段的质量比为0.1至0.9。
数均分子量由链限制剂的含量来固定。其可以根据以下关系式来计算:
在该式中,n单体表示单体的摩尔数,n二酸表示过量的二酸限制剂的摩尔数,MW重复单元表示重复单元的分子量,并且MW二酸表示过量的二酸的分子量。
根据具体的实施方案,共聚物由以下范围的数均分子量Mn来限定:
另外,根据本发明,共聚物的聚酰胺嵌段与聚醚嵌段的质量比为0.1至0.9。这种质量比可以通过将聚酰胺嵌段的数均分子量除以聚醚嵌段的数均分子量来计算。
根据具体的实施方案,该比例为0.1至0.2;或者0.2至0.3;或者0.3至0.4;或者0.4至0.5;或者0.5至0.6;或者0.6至0.7;或者0.7至0.8;或者0.8至0.9。
优选地,本发明使用的共聚物的瞬时硬度小于或等于40肖氏(Shore)D,更优选小于或等于35肖氏D。可以根据ISO 868标准来进行硬度测量。
将聚酰胺聚醚嵌段共聚物用于在无交联步骤的情况下形成泡沫。通过将熔融状态的共聚物与膨胀剂混合然后进行发泡步骤来形成泡沫。
根据一个实施方案,由此形成的泡沫基本上由以下组成,或者甚至由以下组成:以上所述的共聚物(或者多种共聚物,如果使用了共聚物的混合物)以及任选的膨胀剂,如果膨胀剂存在泡沫的孔中,特别是如果其为闭合孔的泡沫。
聚酰胺聚醚嵌段共聚物可以与各种添加剂结合,例如乙烯和乙酸乙烯酯的共聚物或者EVA(例如由Arkema以名称出售的那些添加剂),或者乙烯和丙烯酸酯的共聚物,或者乙烯和烷基(甲基)丙烯酸酯的共聚物,例如由Arkema以名称出售的那些共聚物。这些添加剂有可能调整所形成的块的硬度、其外观及其舒适度。相对于聚酰胺聚醚嵌段共聚物,添加剂可以以0至50重量%、优选5重量%至30重量%的含量来添加。
膨胀剂可以是化学试剂或物理试剂。优选地,膨胀剂为物理试剂,例如,双氮或二氧化碳、或烃、氯氟烃、氢氯烃、氢氟烃或氢氯氟烃(饱和或不饱和的)。例如,可以使用丁烷或戊烷。
将物理膨胀剂以液体形式或超临界形式与共聚物混合,然后在发泡步骤期间转化成气相。
根据优选的实施方案,将共聚物和膨胀剂的混合物注入模具中,并且通过开启模具来产生发泡。这种技术使得有可能直接产生具有复杂几何形状的三维发泡的物体。
这也是实施起来相对简单的技术,特别是相对于现有技术所描述的用于熔化发泡颗粒的某些方法:实际上,用发泡的聚合物颗粒填充模具,然后将颗粒熔化以确保部件的机械强度而不破坏泡沫的结构,是复杂的操作。
可以使用的其他发泡技术特别地是“间歇式”发泡和挤出发泡。
根据本发明产生的泡沫优选地具有50kg/m3至800kg/m3的密度,并且更优选地具有100kg/m3至600kg/m3的密度。可以通过调节制造过程的参数来实现密度控制。
优选地,根据ISO 8307标准,这种泡沫具有大于或等于55%的回弹性。
优选地,根据ISO 7214标准,这种泡沫具有小于或等于10%并且更优选小于或等于8%的压缩形变。
优选地,这种泡沫还具有疲劳抗性和阻尼的优异性质。
本发明的泡沫可以用于制造运动装备,例如运动鞋的鞋底;滑雪靴;鞋底夹层;鞋内底;或者功能性组件鞋底,作为鞋底不同部分(例如脚后跟或脚弓)的衬垫的形式;或者甚至鞋顶部的组件,作为增强件的形式;或者鞋上部结构中的衬垫,作为防护件的形式。
本发明的泡沫也可以用于制造球、运动手套(例如足球手套)、高尔夫球组件、球拍、防护元件(背心、头盔内衬或船体元件….)。
本发明的泡沫具有令人关注的防震、防振动和防噪音的性质,结合了适于装备商品的触觉性质。因此其也可以用于制造铁路轨道衬垫,或者用于汽车工业、运输、电气和电子装备、建筑或者制造工业中的各种部件。
本发明的泡沫物体的优点是,它们可以容易地回收,例如,通过将它们在装备有脱气出口的挤出机中熔化(任选地在将它们切割成块之后)。
实施例
以下实施例说明了本发明,但不限制本发明。
实施例1
测试了不同的PEBA共聚物,它们的特性概述于下表中:
Tf表示共聚物的熔化温度,并且Tc表示其结晶温度。对于所有的这些共聚物,聚醚嵌段是PTMG嵌段。
共聚物A至D是本发明的共聚物,并且共聚物E和F相当于比较例。
通过Arburg Allrounder 270C注射压机,使用Trexel系列II型物理膨胀剂注射系统,由共聚物A至F制备泡沫。操作参数如下:
-外壳温度:160℃至210℃。
-注射速度:112cm/s。
-开启模具前的保持时间:25s至40s。
-冷却时间:120s至180s。
-模具温度:60℃至80℃。
-模具开启长度:长达12mm。
-模具的开启速度:50mm/s.
-总循环时间:145s至220s。
使用的发泡剂是以多至0.6重量%引入的双氮。
Infinergy牌的热塑性聚氨基甲酸酯泡沫(BASF)和交联的EVA泡沫也用作对照。
评估了所获得的泡沫的各种性质:
-密度:根据ISO 845标准;
-回弹性:根据ISO 8307标准(将16.8g且直径16mm的钢球从500mm的高度坠落至泡沫样品上,因此回弹性相当于返回至球的能量的百分比,或者回弹的球达到的初始高度的百分比);
-压缩形变:由以下来进行测量,即将样品以一定的变形速率进行压缩持续给定的时间,然后释放松弛应力,并且在恢复时间后记录残余变形;所述测量改编自ISO 7214标准,使用50%的变形,22h的保持时间,23℃的温度,并且在恢复30min后进行测量,并且在恢复24h后进行另一次测量。
聚合物 密度(kg/m3) 回弹性(%) 30min时的CS(%) 24h的CS(%)
PEBA N°A 200 61.5 4.5
PEBA N℃ 220 64 2.5
PEBA N°B 200 65 7.5 4.5
PEBA N°B 300 66 8 5
PEBA N°B 400 61 6 5
PEBA N°D 220 63 4
PEBA N°E 280 51 5
PEBA N°F 240 54 4.5
TPU 140 63 18 1
EVA 160 34 24
实施例2
在本实施例中,对使用200kg/m3的PEBA编号B制造的泡沫和对照TPU泡沫进行压缩疲劳测试。
对50mm直径且约15mm厚的样品以1.5Hz的频率进行疲劳测试。通过液压测力计(MTS810)施加应力,其根据0kPa至360kPa或0kPa至720kPa的正弦信号来变化。
在350,000次循环之后,测量样品厚度的演变,其随着时间恢复至初始形状。理想的材料会立即恢复至其初始形状。目前使用的泡沫在松弛几天后具有10%量级的残余变形。
这种疲劳测试很好地重现了泡沫样品经受的机械应力,尤其是在诸如运动鞋的鞋底的应用中。
结果示于图1中。标有白色正方形的曲线对应于以720kPa测试的对照泡沫。标有白色圆圈的曲线对应于以720kPa测试的本发明的泡沫。标有黑色圆圈的曲线对应于以360kPa测量的对照泡沫。标有灰色叉的曲线对应于以360kPa测试的本发明的泡沫。
发现本发明的泡沫比对照泡沫更迅速地恢复至其初始形状(最小残余变形水平)。

Claims (12)

1.非交联的聚酰胺聚醚嵌段共聚物的泡沫,其中:
-所述共聚物的聚酰胺嵌段的数均分子量为200g/mol至1500g/mol;
-所述共聚物的聚醚嵌段的数均分子量为800g/mol至2500g/mol;以及
-所述共聚物的聚酰胺嵌段与聚醚嵌段的质量比为0.1至0.9。
2.如权利要求1所述的泡沫,其中:
-所述共聚物的聚酰胺嵌段的数均分子量为400g/mol至1000g/mol,优选为600g/mol至850g/mol;
-所述共聚物的聚醚嵌段的数均分子量为1000g/mol至2000g/mol;以及
-所述共聚物的聚酰胺嵌段与聚醚嵌段的质量比为0.3至0.6。
3.如权利要求1或2所述的泡沫,其中所述共聚物的聚酰胺嵌段是聚酰胺11的嵌段、或聚酰胺12的嵌段、或聚酰胺6的嵌段、或聚酰胺6.10的嵌段。
4.如权利要求1至3中任一项所述的泡沫,其中所述共聚物的聚醚嵌段是聚乙二醇的嵌段或聚四氢呋喃的嵌段。
5.如权利要求1至4中任一项所述的泡沫,其密度小于或等于800kg/m3,优选小于或等于600kg/m3,更特别优选小于或等于400kg/m3,或者甚至小于或等于300kg/m3
6.如权利要求1至5中任一项所述的泡沫,其还含有一种或多种添加剂,所述添加剂优选地选自乙烯和乙酸乙烯酯的共聚物、乙烯和丙烯酸酯的共聚物、以及乙烯和烷基(甲基)丙烯酸酯的共聚物。
7.用于制造权利要求1至6中任一项所述的泡沫的方法,包括将熔融状态的所述共聚物与膨胀剂并任选地与一种或多种添加剂混合的步骤,以及将所述共聚物和膨胀剂的混合物发泡的步骤。
8.如权利要求7所述的方法,其中所述膨胀剂是物理膨胀剂,所述物理膨胀剂优选地选自双氮、二氧化碳、烃、氯氟烃、氢氯烃、氢氟烃和氢氯氟烃。
9.如权利要求7或8中任一项所述的方法,包括将所述共聚物和膨胀剂的混合物注入模具中的步骤,其中通过开启所述模具来进行所述混合物的发泡。
10.由权利要求1至6中任一项所述的泡沫组成的制品。
11.包含至少一个由权利要求1至6中任一项所述的泡沫组成的元件的制品。
12.如权利要求10或11中任一项所述的制品,其选自运动鞋的鞋底、球、手套、个人防护装备、轨道衬垫、汽车部件、建筑部件以及电气和电子装备的部件。
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