CN110014709A - 聚氨酯弹性体声子晶体消音膜及其制造方法 - Google Patents
聚氨酯弹性体声子晶体消音膜及其制造方法 Download PDFInfo
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Abstract
本发明涉及一种聚氨酯弹性体声子晶体消音膜及其制造方法,其消音膜包括至少四个周期组元,每个周期组元由聚氨酯层和振子层组成,其中振子层由聚合物包覆大量微珠振子组成,微珠振子由金属微珠外覆盖一层软质弹性体构成;本发明的制作方法是由软质弹性体包覆金属微珠构成的微珠振子与聚合物粒料混合均匀后,由一个挤出单元熔融挤出,同时聚氨酯原料由另一个挤出单元熔融挤出,进入汇流单元,然后依次经过m个层叠单元,在每个层叠单元中的n个扭转流道进行n次分割、扭转、层叠,形成振子层与聚氨酯层交替排列的声子晶体。本发明消音膜的制造工艺非常简单,生产效率高,易于实现规模化生产,并且适用性强,可以覆盖在大型目标表面实现消音功能。
Description
技术领域
本发明属于新材料与先进制造技术领域,涉及一种聚氨酯弹性体声子晶体消音膜及其制造方法。
背景技术
随着航空航天、高速列车、输变电工程等的飞速发展,噪声问题日益严重,引起了人们的广泛关注。在日常生活中,噪声干扰着人们的正常生活和工作,长期暴露在高噪声环境下会对人的身体健康造成危害。在生产实践中,高噪声会影响仪器的使用精度甚至造成仪器失效或损坏。在军事国防领域,消声隐身是潜艇的关键技术。因此,噪声控制在民用和军事领域都是一项非常重要的工作。
采用传统的吸隔音技术,能够有效隔离噪声中的中高频成分。但对于低频噪声(2000Hz以下),由于受到质量密度定律控制,难以用轻质材料实现低频宽带隔音。然而声子晶体的出现使得轻质材料实现低频带宽隔音成为了可能。
声子晶体是由两种或两种以上弹性介质组成的具有周期结构和弹性波带隙特性的功能材料或结构。目前声子晶体的带隙机理有两种,分别是布拉格(Bragg)散射机理和局域共振机理。在布拉格散射机理作用下,带隙产生的主要原因是周期变化的材料特性与弹性波的相互耦合作用。因此,其最低带隙中心频率约为c/2a(其中c为基体材料中的弹性波波速,a为周期尺寸),即最低带隙中心频率对应的弹性波波长约为晶格常数的2倍。由于布拉格散射型声子晶体的带隙频率与周期尺寸紧密相关,因此难以在较小的周期尺寸(几厘米或更小)条件下得到低频(尤其是1KHz以下)的带隙,这对其在低频减振降噪方面的应用不利。2000年,刘正猷教授等人首次提出局域共振机理(Liu.Science,2000,289:1734-1736.),局域共振机理认为,在特定频率的弹性波激励下,各个散射体产生共振,并与弹性波长波行波相互作用,从而抑制其传播。由于局域共振带隙的产生取决于散射体自身共振特性与基体中长波行波的相互作用,因此,其带隙频率与单个散射体固有的振动特性密切相关。理论和实验结果表明,该声子晶体的带隙所对应的波长远大于晶格常数,突破了布拉格散射机理的限制。而且在散射体并非严格周期分布时,复合结构同样具有带隙。这为声子晶体的低频减振降噪应用开创了新的局面。尽管局域共振机理在低频降噪方面有巨大的潜力,目前仍不能有效进行实际应用。现有降噪消音技术仍然以布拉格散射机理为主,例如,专利(专利号:CN 102022222 B)提出了一种消声器,用于飞机辅助动力装置排气系统上的消声器。专利(专利号:CN 204340775 U)提出了一种广义声子晶体隔音罩,由金属层和非金属层构成周期组元,具有隔声量大、便于装拆等优点,但是应用范围较窄,且占用空间较大。专利(专利号:CN 106023975 A)提出了一种轻质低频宽带隔声组合结构,包括薄膜型声子晶体结构,局域共振型声子晶体结构以及他们之间的空腔,能实现较高的隔声量,但是该设计结构复杂,加工难度大。
目前基于声子晶体特性设计的消音结构普遍应用布拉格散射机理,对低频声波阻隔性能差;采用刚性骨架,应用范围较窄,适用性较低,并且不能够对大型目标进行有效隔音,例如列车、潜艇等。因此声子晶体的隔音能力还没有能够有效地开发利用。
发明内容
本发明针对传统隔音技术低频隔音效果低、声子晶体的隔音能力未能有效利用等问题,提出了聚氨酯弹性体声子晶体消音膜及其制造方法。
为了实现上述目的,本发明聚氨酯弹性体声子晶体消音膜,包括至少四个周期组元,每个周期组元由聚氨酯层和振子层组成,其中振子层由聚合物包覆大量微珠振子组成,微珠振子由金属微珠外覆盖一层软质弹性体构成;其制造方法所需的熔体层叠设备由挤出单元、汇流单元、层叠单元、机头单元组成,两个挤出单元分别与汇流单元连接,汇流单元后接一个或多个层叠单元,最后一个层叠单元与机头单元连接;汇流单元内有汇流流道,层叠单元内有层叠流道I和层叠流道Ⅱ等,机头单元内有机头流道;各流道彼此相连,其中,每个层叠单元内部的流道包含两个或多个扭转流道,每个扭转流道扭转后再汇合到一起。
本发明一种聚氨酯弹性体声子晶体消音膜制造方法为:由软质弹性体包覆金属微珠构成的微珠振子与聚合物粒料混合均匀后,由一个挤出单元熔融挤出,同时聚氨酯原料由另一个挤出单元熔融挤出,进入汇流单元的汇流流道汇流成上下两层的膜结构Ⅰ,然后依次经过m个层叠单元,在每个层叠单元中的n个扭转流道进行n次分割、扭转、层叠,形成由nm个周期组元构成的振子层与聚氨酯层交替排列的声子晶体。n和m通常都为大于或等于2的整数。
本发明一种聚氨酯弹性体声子晶体消音膜及其制造方法,软质弹性体优先选择质软的橡胶,且其耐高温性能较好,可采用硅橡胶。
本发明一种聚氨酯弹性体声子晶体消音膜及其制造方法,金属微珠优先选择密度高的金属,可采用如铅、铜、钢铁等,微珠的粒径可达1-2mm。
本发明一种聚氨酯弹性体声子晶体消音膜及其制造方法,聚合物可选用环氧树脂。环氧树脂加工温度低,对微珠振子的包覆层没有影响,并且环氧树脂能够很好地粘附微珠振子,环氧树脂与微珠振子混合形成的混合物的流动性也较好。
本发明一种聚氨酯弹性体声子晶体消音膜及其制造方法,聚氨酯层可特别地采用发泡聚氨酯。
本发明一种聚氨酯弹性体声子晶体消音膜及其制造方法,金属微珠可特别地采用两种或多种不同尺寸规格,并形成不同规格的微珠振子。
本发明的有益效果是:聚氨酯层与振子层的周期性排布,形成了一维声子晶体,根据布拉格散射机理,对高频范围的声音具有良好的阻隔效应;振子层中微珠振子的存在,利用了局域共振机理,可以阻隔低频范围的声波;采用熔融层叠设备的聚氨酯弹性体声子晶体消音膜的制造方法,其制造工艺非常简单,生产效率高,易于实现规模化生产,并且适用性强,可以覆盖在大型目标表面实现消音功能,例如,音乐厅、教室、会议室、家居墙体等,还可应用于舰艇的消声瓦。
附图说明
图1是本发明聚氨酯弹性体声子晶体消音膜及其制造方法的制备演化图。
图2是本发明聚氨酯弹性体声子晶体消音膜及其制造方法的装置示意图。
图3是本发明聚氨酯弹性体声子晶体消音膜及其制造方法的熔体流道示意图。
图中:1-微珠振子,2-金属微珠,3-软质橡胶,4-聚氨酯,5-膜结构Ⅰ,6-膜结构Ⅱ,7-膜结构Ⅲ,8-周期组元,9-聚氨酯层,10-振子层,11-聚合物,12-挤出单元,13-汇流单元,14-层叠单元,15-机头单元,16-汇流流道,17-层叠流道Ⅰ,18-层叠流道Ⅱ,19-机头流道,20-扭转流道。
具体实施方式
本发明聚氨酯弹性体声子晶体消音膜,包括至少四个周期组元8,每个周期组元8由聚氨酯层9和振子层10组成,其中振子层10由聚合物11包覆大量微珠振子1组成,微珠振子1由金属微珠2外覆盖一层软质弹性体3构成;其制造方法所需的熔体层叠设备由挤出单元12、汇流单元13、层叠单元14、机头单元15组成,两个挤出单元12分别与汇流单元13连接,汇流单元13后接一个或多个层叠单元14,最后一个层叠单元14与机头单元15连接;汇流单元13内有汇流流道16,层叠单元14内有层叠流道I 17和层叠流道Ⅱ18等,机头单元15内有机头流道19;各流道彼此相连,其中,每个层叠单元14内部的流道包含两个或多个扭转流道20,每个扭转流道20扭转后再汇合到一起。
本发明一种聚氨酯弹性体声子晶体消音膜制造方法为:由软质橡胶3包覆金属微珠2构成的微珠振子1与聚合物11粒料混合均匀后,由一个挤出单元12熔融挤出,同时聚氨酯4原料由另一个挤出单元12熔融挤出,进入汇流单元13的汇流流道16汇流成上下两层的膜结构Ⅰ5,然后依次经过m个层叠单元14,在每个层叠单元14中n个扭转流道20中进行n次分割、扭转、层叠,形成由nm个周期组元8构成的振子层10与聚氨酯层9交替排列的声子晶体。
图3聚氨酯弹性体声子晶体消音膜及其制造方法的熔体流道示意图中,每个层叠单元3内部包含n=4个扭转流道20,层叠单元14的个数为m=2个,相应的层叠流道个数也是2个,分别是层叠流道Ⅰ17,层叠流道Ⅱ18。聚氨酯弹性体声子晶体消音膜的制备演化图1,为图3所示扭转流道20个数为4、层叠单元14个数为2的熔体流道对应装置制造的消音膜的制备演化过程。熔体经过汇流流道16后,形成上下两层的膜结构Ⅰ5,随后经过层叠流道Ⅰ17,经过四个扭转流道20的分流扭转作用,形成8层的膜结构Ⅱ6,再经过层叠流道Ⅱ18四个扭转流道20的分流扭转作用,形成32层的膜结构Ⅲ7。最终熔体经机头流道19挤出,形成振子层10与聚氨酯层9交替的32层结构的消音膜。
聚氨酯层与振子层的周期性排布,形成了一维声子晶体,根据布拉格散射机理,弹性波带隙的产生及其特性与复合介质的材料参数(密度和弹性常数)以及结构参数(晶格结构、周期尺寸及填充率等)均紧密相关。一般来说,声子晶体中各组分的弹性常数和密度差异越大,越容易产生带隙,因此弹性材料选用聚氨酯,有利于带隙的形成。一维声子晶体的周期结构对于高频范围的声音具有良好的阻隔效应,而对低频范围的声波的阻隔效果较弱。振子层中金属微珠与软质橡胶构成了微珠振子,形成声波的散射体,基于局域共振原理,这种散射体有助于阻隔高频声波。在特定频率的弹性波激励下,各个散射体产生共振,并与弹性波长波行波相互作用,从而抑制其传播。由于局域共振带隙的产生取决于散射体自身共振特性与基体中长波行波的相互作用,因此,其带隙频率与单个散射体固有的振动特性密切相关。基于局域共振机理,由微珠振子与聚合物构成的振子层所形成的带隙所对应的波长远大于周期性一维声子晶体的晶格常数,即能够阻隔低频声波的传播。通过这种将布拉格散射机理与局域共振机理结合的方法,能够实现对较大频率范围内声波的阻隔。
特别地,聚氨酯可以通过加入发泡剂的方法,使最终形成的聚氨酯层由发泡聚氨酯构成,更低密度、更加柔软的聚氨酯层更有利于声子晶体带隙的形成。微珠振子可以由两种或多种不同规格尺寸的金属微珠制成,不同规格的微珠振子的振动特性不同,可以进一步拓宽所阻隔声波的频率范围。
此外,采用熔融层叠设备的聚氨酯弹性体声子晶体消音膜的制造方法,其制造工艺非常简单,生产效率高,易于实现规模化生产,并且适用性强,可以覆盖在大型目标表面实现消音功能,例如,音乐厅、教室、会议室、家居墙体等,还可应用于舰艇的消声瓦。
以上所述为本发明的聚氨酯弹性体声子晶体消音膜及其制造方法,配合各图予以说明。但是本发明并不局限于以上所述的具体设备及工艺过程,任何基于上述所说的对于相关消音膜及其制造方法的修改或替换,任何基于上述所说的对于相关工艺的局部调整,只要在本发明的精神领域范围内,均属于本发明。
Claims (7)
1.聚氨酯弹性体声子晶体消音膜,其特征在于:包括至少四个周期组元,每个周期组元由聚氨酯层和振子层组成,聚氨酯层与振子层周期性排布,形成了一维声子晶体,其中振子层由聚合物包覆大量微珠振子组成,微珠振子由金属微珠外覆盖一层软质弹性体构成。
2.根据权利要求1所述的聚氨酯弹性体声子晶体消音膜,其特征在于:软质弹性体选择质软的硅橡胶。
3.根据权利要求1所述的聚氨酯弹性体声子晶体消音膜,其特征在于:金属微珠的材料选择铅、铜或钢铁。
4.根据权利要求1所述的聚氨酯弹性体声子晶体消音膜,其特征在于:金属微珠采用两种或多种不同尺寸规格,并形成不同规格的微珠振子。
5.根据权利要求1所述的聚氨酯弹性体声子晶体消音膜,其特征在于:聚合物选用环氧树脂。
6.根据权利要求1所述的聚氨酯弹性体声子晶体消音膜,其特征在于:聚氨酯层可采用发泡聚氨酯。
7.聚氨酯弹性体声子晶体消音膜的制造方法,其特征在于:由软质弹性体包覆金属微珠构成的微珠振子与聚合物粒料混合或液体均匀后,由一个挤出单元熔融挤出,同时聚氨酯原料由另一个挤出单元熔融挤出,进入汇流单元的汇流流道汇流成上下两层的膜结构Ⅰ,然后依次经过m个层叠单元,在每个层叠单元中的n个扭转流道进行n次分割、扭转、层叠,形成由nm个周期组元构成的振子层与聚氨酯层交替排列的声子晶体,所需的熔体层叠设备由挤出单元、汇流单元、层叠单元、机头单元组成,两个挤出单元分别与汇流单元连接,汇流单元后接一个或多个层叠单元,最后一个层叠单元与机头单元连接;汇流单元内有汇流流道,层叠单元内有层叠流道I和层叠流道Ⅱ等,机头单元内有机头流道;各流道彼此相连,其中,每个层叠单元内部的流道包含两个或多个扭转流道,每个扭转流道扭转后再汇合到一起,n和m都为大于或等于2的整数。
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