CN109263172B - 一种波浪型碳毡电磁屏蔽结构体及其制备方法 - Google Patents
一种波浪型碳毡电磁屏蔽结构体及其制备方法 Download PDFInfo
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- CN109263172B CN109263172B CN201811327703.XA CN201811327703A CN109263172B CN 109263172 B CN109263172 B CN 109263172B CN 201811327703 A CN201811327703 A CN 201811327703A CN 109263172 B CN109263172 B CN 109263172B
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Abstract
一种波浪型碳毡电磁屏蔽结构体及其制备方法,所述结构体采用多层波浪型碳毡按照一定的角度组合,所述多层波浪型碳毡采用胶黏剂粘结,所述波浪型碳毡采用树脂为基体,碳纤维毡为功能体。本发明的电磁屏蔽结构体内部具有较大的内表面积,电磁波透射过表层碳毡之后,内层碳毡曲面可以对其进行多次反射,结合碳毡内部碳纤维对电磁波的多重散射作用,从而显著增强碳毡结构体对电磁波的损耗和吸收,提高电磁屏蔽效能,表层波浪型碳毡还显著降低对入射电磁波的反射作用,减少电磁波对周边设备和人员的影响,在某些应用领域可以起到隐身作用。
Description
技术领域
本发明涉及电磁屏蔽领域,具体涉及一种波浪型短切碳纤维毡电磁屏蔽结构体的设计和制备方法。
背景技术
电磁辐射污染是继大气污染、水污染以及噪音污染之后的第四大环境污染。随着现代电子工业的快速发展,各种电子设备广泛应用于航空航天、军事、医疗、交通等多个领域,其内部的电子器件运行时会向外辐射一定频率和能量的电磁波。由此产生的电磁辐射不仅威胁到电子设备的运行和信息安全,而且会对辐射区域内人员的身心健康造成危害,同时外部电磁辐射也会干扰电子器件本身的正常运行。因此需要对电磁辐射进行屏蔽,电磁屏蔽材料的使用必不可少。
常用的电磁屏蔽材料为金属材料,但是金属材料重量大、耐腐蚀性差等缺点使得对新型电磁屏蔽材料的需求日益迫切。碳纤维具有低密度、高强度、高模量、高导电、高导热等诸多优点,不但具有较高的电磁屏蔽效能,而且具有轻量化、耐腐蚀、多功能等优势,因此在电磁屏蔽领域中有巨大的应用前景。碳毡通常是由短切碳纤维粘结而成的布状物,厚度通常在100~600微米,其内部纤维相互搭接形成导电网络,对电磁波形成了较强的反射和吸收作用,电磁屏蔽性能高,此外碳毡还具有良好的柔性,便于进行曲面产品的设计,生产成本较低,便于大规模应用等优点。
经查询,国内目前和碳毡相关的电磁屏蔽专利有两个:(1)申请公布号CN108215385A(审中实审),多层的碳毡与绝缘粘合层交替堆叠后进行热压成型得到一种电磁屏蔽薄膜;(2)专利号CN103112222A,把掺有聚苯胺的树脂基体胶结剂均匀涂覆在碳毡表面得到复合物,然后对其进行预固化,重复涂覆和预固化操作得到多层复合物,最后对堆叠的多层复合物进行热压成型得到聚苯胺和碳毡复合屏蔽材料。
目前用于电磁屏蔽的碳纤维毡及其相关制品是二维结构,碳毡电磁屏蔽机制主要包括:(1)在碳毡/空气界面处的阻抗不匹配所带来的反射;(2)碳毡内部对电磁波的多重散射所导致的吸收。从碳毡相关研究来看,其反射系数大于吸收系数,说明大部分电磁辐射被反射,只有少量被碳毡吸收。而且,碳毡内部纤维间距较小,对电磁波的散射效果有限,从而限制了其吸收性能的进一步提高。发明人研究发现从碳毡的结构设计角度出发,通过调控碳毡的宏观形状来增强其对电磁波的吸收效果,进而提高电磁屏蔽效能。碳毡吸收效能的提升可以大幅降低电磁波二次反射对电子设备和人体健康的危害作用,同时能有效吸收电子设备泄露出的电磁波,降低电磁干扰,因此对信息安全也有重要的意义。
本专利从电磁屏蔽作用机制出发,并参考结构吸波材料的设计理念,提出波浪型碳毡电磁屏蔽结构体的设计思路和制备方法。二维碳毡首先通过波浪型模具定型得到波浪型碳毡,然后对多层的波浪型碳毡进行不同角度的堆叠粘结,最终得到一种多层波浪型碳毡电磁屏蔽结构体。这种电磁屏蔽结构体内部具有较大的内表面积,电磁波透射过表层碳毡之后,内层碳毡曲面可以对其进行多次反射,结合碳毡内部碳纤维对电磁波的多重散射作用,从而显著增强碳毡结构体对电磁波的损耗和吸收,提高电磁屏蔽效能,同时表层波浪型碳毡还可以显著降低对入射电磁波的反射作用,一方面减少电磁波对周边设备和人员的影响,另一方面在某些应用领域可以起到一定的隐身作用。
发明内容
本发明的主要目的是提供一种波浪型碳毡电磁屏蔽结构体的设计和制备方法,这种结构体保持轻质的同时具有优异的电磁屏蔽性能。具体方案如下:
一种波浪型碳毡电磁屏蔽结构体,所述结构体采用多层波浪型碳毡按照一定的角度组合,所述多层波浪型碳毡采用胶黏剂粘结,所述波浪型碳毡采用树脂为基体,碳纤维毡为功能体,采用相关工艺进行定型。
所述多层碳毡可以设计为如附图2所示的多种组合角度,不同角度的堆叠在多层波浪型碳毡内部形成多个空腔,电磁波进入空腔后通过多次内部反射被吸收。3层[0]3型波浪型碳毡结构体示意图如附图10所示,图中用箭头的粗细以及颜色深浅表示电磁波的强弱,由此可见,入射电磁波1在多层波浪型碳毡结构体中经过多次反射吸收后最终透射出射电磁波5的强度显著降低。
所述粘结多层波浪型碳毡的胶黏剂需根据所使用的基体树脂来确定。一般而言,对于热固性树脂可采用同种类的树脂实施粘结操作;对于热塑性树脂可采用一些特定的粘结剂,如聚丁二烯、有机硅、丙烯酸酯、聚氨酯、改性酚醛树脂、环氧聚氨酯。
所述波浪型碳毡的曲率半径不限,可根据需要屏蔽的电磁波频段进行相应的调整。波浪型碳毡的曲率半径与电磁波波长接近时,对电磁波的屏蔽作用更强。一般而言,电磁波频率较高,波长较短,采用的波浪型碳毡曲率半径较小;电磁波频率较低,波长较长,采用的碳毡曲率半径较大。
所述基体树脂可以是热固性树脂、热塑性树脂以及本征导电高分子。所述热固性树脂包括但不限于不饱和聚酯树脂、环氧树脂、酚醛树脂、三聚氰胺甲醛树脂、呋喃树脂、聚丁二烯树脂、有机硅树脂;所述热塑性树脂包括但不限于聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、聚酰胺、聚甲醛、聚碳酸酯、聚苯醚、聚砜;所述本征导电高分子包括但不限于聚吡咯、聚苯胺、聚乙炔。
通过在所述热固性树脂中加入固化剂,并控制温度、压力实现材料固化定型,这是本领域已经熟知的技术。具体的工艺参数以及加入固化剂种类和用量与选用的树脂有关。例如对于环氧树脂,可以选用咪唑、二乙烯三胺、三乙烯四胺、邻苯二甲酸酐、氟化硼络合物等作为固化剂。
所述碳毡可选用湿法成型的短切碳纤维毡,也可选用针刺方法、预氧丝毡碳化或聚丙烯腈纤维毡预氧化/碳化制备的碳纤维毡。同时也可以采用金属电镀的短切碳纤维制备的碳毡。对于短切碳纤维毡,其纤维长度、面密度等规格指标可以根据实际需求进行选择。
本发明还要求保护上述的波浪型碳毡电磁屏蔽结构体的制备方法,所述相关成型工艺可采用模压成型、拉挤成型或者辊压成型。
模压成型工艺的主要流程为预处理、进模固化、脱模。首先裁剪材料保证其规格与模具相适应,在模具内表面均匀涂抹合适的脱模剂,然后把裁剪好的材料均匀浸润于基体树脂混合液中,或者用热塑树脂膜将材料铺叠为三明治结构,将预处理好的材料放进模具中,在一定的温度下模压固化一段时间以保证材料的完全定型,具体固化温度以及固化时间由具体材料所定。固化完成之后脱膜得到制品。
拉挤成型工艺的主要流程为预处理、预成型、加温固化、牵引以及切割。首先对需要固化的材料进行预处理,在树脂混合液将材料浸润均匀或者将热塑树脂与材料进行包覆。将预处理后的材料先后放入预成型模和成型固化模中间,在成型固化模中加热使其保持一定的固化温度并利用牵引设备进行固化成型,牵引速度、固化温度以及牵引力等工艺参数由具体材料决定。成型之后对材料进行切割处理,得到完全定型的制品。
辊压成型工艺的主要流程为预处理、预固化、辊压定型、切割。首先对需要定型的材料进行预处理,在树脂混合液将材料浸润均匀或者将热塑树脂与材料进行包覆通过预加热炉进行预固化。将预固化完成的材料放置在辊压模具中间,通过多重辊压进行定型,辊压速率、预固化温度等工艺参数由具体材料决定。成型之后对材料进行切割处理,得到完全定型的制品。
所述模压成型和拉挤工艺的模具为波浪型板状结构,如附图3所示;所述辊压成型工艺的模具为波浪状齿轮结构,如附图4所示。
所述脱模剂可以使用硅氧烷化合物、硅油、硅树脂甲基支链硅油、甲基硅油、乳化甲基硅油、含氢甲基硅油、硅脂、硅树脂、硅橡胶、合成石蜡、微晶石蜡、聚乙烯蜡。
本发明还要求保护上述的波浪型碳毡电磁屏蔽结构体的用途,所述结构体应用于方舱、屏蔽室墙面、屏蔽门领域。
本发明相比于现有技术的效果是:
(1)与普通的金属屏蔽材料相比,本发明具有密度低、屏蔽系数高的特点,相同屏蔽能力下可达到轻量化的效果;
(2)与平面型碳毡相比,本发明可显著提高电磁波屏蔽效能,并显著降低电磁波反射系数,可以有效实现电磁屏蔽并防止电磁波二次污染;
(3)本发明与连续碳纤维织物、碳纳米管、石墨烯类屏蔽材料相比,具有更低的成本和更好的工艺性;
(4)本发明所用材料为短切碳纤维,原料来源广泛,可从报废的碳纤维复合材料中进行回收利用,有利于实现碳纤维的循环使用,具有一定的环保优势;
(5)本发明具有较强的可设计性,可以满足多种用途的电磁屏蔽设备的屏蔽要求,满足宽频电磁波的屏蔽需求;
(6)本发明制备的多叠层体系的波浪型复合体内部中空,在厚度方向上具有优良的隔热性能,可以满足相关产品在特定工况下的隔热保温需求。
本发明制备的多层波浪型碳毡结构体可以应用于方舱、屏蔽室墙面、屏蔽门等多个领域,具有良好的应用前景。
附图说明
图1单层波浪型碳毡结构示意图;
图2(a)6层[0]6型波浪型碳毡组合体结构示意图;(b)6层[0/90]3型波浪型碳毡组合体结构示意图;(c)6层[0/45]3型波浪型碳毡组合体结构示意图;(d)8层[0/±45/90]2型波浪型碳毡组合体结构示意图:1为堆叠角度为0°的单层波浪型碳毡,2为堆叠角度为90°的单层波浪型碳毡,3为堆叠角度为-45°的单层波浪型碳毡,4为堆叠角度为45°的单层波浪型碳毡;
图3制备波浪型碳毡的平板模具示意图:1为加热棒,2为平板型模具的A模,3为二维碳毡,4为平板型模具的B模;
图4制备波浪型碳毡的齿轮型模具示意图;
图5模压成型制备波浪型碳毡流程示意图:(a)为碳毡的预处理;(b)为碳毡的模压成型;(c)为脱模取出的波浪型碳毡;
图6拉挤工艺制备波浪型碳毡中加热固化成型示意图:1为热塑树脂膜,2为二维碳毡,3为预加热炉,4为滚轮,5为预固化完成的碳毡,6为加热棒,7为平板型模具的A模,8为平板型模具的B模,9为波浪型碳毡;
图7辊压成型制备波浪型碳毡流程示意图:1为热塑树脂膜,2为平面型碳毡,3为预处理加热炉,4为滚轮,5为上锻辊,6为下锻辊,7为波浪型碳毡;
图8平面型碳毡电磁屏蔽机理示意图:1为入射电磁波,2为透射电磁波,3为反射出射电磁波,4为内部一次反射电磁波,5为透射出射电磁波;
图9单层波浪型碳毡电磁屏蔽机理示意图:1为反射出射电磁波,2为一次反射电磁波,3为入射电磁波,4为透射出射电磁波;
图10多层波浪型碳毡电磁屏蔽机理示意图(以[0]n型多层为例):1为入射电磁波,2为反射出射电磁波,3为一次反射电磁波,4为透射电磁波,5为透射出射电磁波;
图11曲率半径1-4mm的波浪型碳毡(1-4)以及平面型碳毡(0)在X波段电磁屏蔽测试结果对比折线图;
图12曲率半径1-4mm的波浪型碳毡(1-4)以及平面型碳毡(0)在8.2GHz时电磁屏蔽的吸收和反射结果折线图;
图13曲率半径为1mm的波浪型碳毡与平面型碳毡在X波段的电磁屏蔽的吸收和反射对比图;
图14曲率半径为1mm的单层到4层波浪型碳毡在X波段的电磁屏蔽结果
具体实施方式
以下结合具体实施例进一步阐释本发明的技术方案,但不作为对本发明保护范围的限制。
本发明提供一种波浪型碳毡电磁屏蔽结构体的设计和制备方法,所述结构体由多层波浪型碳毡按照一定角度组合并使用胶黏剂粘接而成。
在本发明中,波浪型碳毡电磁屏蔽结构体可以设计为如附图2所示的多种组合角度。在附图2中,(a)6层[0]6型波浪型碳毡组合体结构示意图;(b)6层[0/90]3型波浪型碳毡组合体结构示意图;(c)6层[0/45]3型波浪型碳毡组合体结构示意图;(d)8层[0/±45/90]2型波浪型碳毡组合体结构示意图:1为堆叠角度为0°的单层波浪型碳毡,2为堆叠角度为90°的单层波浪型碳毡,3为堆叠角度为-45°的单层波浪型碳毡,4为堆叠角度为45°的单层波浪型碳毡。波浪型碳毡电磁屏蔽结构体的碳毡层数和组合角度可以根据实际需求进行调整和设计。
本发明中制备多层波浪型碳毡结构体分为单层波浪型碳毡的制备以及把单层波浪型碳毡按照一定角度粘结成结构体两步。
本发明制备单层波浪型碳毡的基体可以是热固性树脂、热塑性树脂或者本征导电高分子溶液。本发明制备单层波浪型碳毡的平面型碳毡可选用湿法成型的短切碳纤维毡,也可选用针刺方法、预氧丝毡碳化或聚丙烯腈纤维毡预氧化/碳化制备的碳纤维毡。同时也可以采用金属电镀的短切碳纤维制备的碳毡。
当制备单层波浪型碳毡的基体为热固性树脂或者本征高分子溶液时,可以使用模压成型工艺、拉挤工艺或者辊压工艺对碳毡进行成型,其中模压成型的制备流程如附图5所示:首先配制树脂基体溶液并对碳毡进行裁剪保证其规格与模具相适应,同时在如附图3所示的平板型模具内表面涂抹合适的脱模剂。然后把碳毡在基体溶液中浸渍均匀如附图5(a)所示,把处理好的碳毡置于平板型模具中间并利用加热棒保持一定的固化环境温度下模压一段时间如附图5(b)所示,最终得到完全固化的单层波浪型碳毡如附图5(c)所示。
当制备单层波浪型碳毡的基体为热塑性树脂时,可以使用模压成型、拉挤工艺或者辊压工艺对碳毡进行成型,其中拉挤成型工艺中加热固化成型如附图6所示:首先对碳毡进行预处理,把热塑树脂膜与碳毡进行包覆形成的三明治结构放置在如附图6中3所示的加热炉中进行预处理,然后把预处理完成的碳毡放入的平板型模具中间并利用加热棒保持一定的固化温度进行牵引固化成型。在附图6中,1为热塑树脂膜,2为平面型碳毡,9为波浪型碳毡。辊压成型工艺中辊压成型如附图7所示:首先对碳毡进行预处理,把热塑树脂膜与碳毡进行包覆形成的三明治结构放置在如附图7中3所示的加热炉中进行预处理,然后把预处理完成的碳毡放入辊压模具中通过三重辊压成型得到波浪型碳毡结构如附图7中6所示,最后通过切断得到所需尺寸的波浪型碳毡。在附图7中,1为热塑性树脂膜,2为平面碳毡,6为固化完成的波浪型碳毡。
使用模压成型工艺、拉挤工艺或者辊压工艺得到多个单层波浪型碳毡,然后使用一定的胶黏剂把多个单层波浪型碳毡按照设计的角度进行粘结得到多层波浪型碳毡屏蔽结构体。
实施例1
本实施例采用纤维长度6mm,单位面积重量10g/m2的碳毡作为功能体,采用环氧树脂作为基体,使用模压成型法制备5层单元波浪碳毡曲率半径为4mm的电磁屏蔽结构体,铺层角度为附图2(a)中的[0]6。胶黏剂为环氧树脂,脱模剂选用二甲基硅油。
步骤一:树脂固化剂的制备
按照质量比环氧树脂:咪唑=100:3来称量相应质量的环氧树脂和咪唑,将上述两种一定质量的溶液常温混合并不断搅拌直至溶液呈均相。
步骤二:碳毡及模具的预处理
按照附图3所示平板型模具的合适尺寸裁剪碳毡。将裁剪好的碳毡浸渍在配制好的树脂溶液中,保证树脂溶液在碳毡表面浸渍均匀。在附图3所示曲率半径为4mm的平板型模具内表面用二甲基硅油涂抹均匀。
步骤三:单层碳毡的模压成型
把浸渍有树脂溶液的碳毡放置在图3所示A模与B模之间,在0.1MPa压力下合模压制,调整加热棒温度为120℃压制三分钟进行固化成型。固化完成后取出并脱模得到单层波浪形碳毡待用。
步骤四:多层波浪型碳毡结构体的制备
采用快速固化环氧树脂作为胶黏剂,按照附图2(a)所示组合方式对六层波浪形碳毡进行粘结,最终得到[0]6型五层波浪型碳毡结构体。
使用该方法得到的波浪型碳毡在经过波导法测试后,对数据进行分析可以发现,波浪型碳毡的曲率半径越大屏蔽效果越显著,如附图11所示;同时吸收增强反射减少,如附图12所示;与平面型碳毡相比,波浪型碳毡对电磁波的吸收显著升高并且发射减少,如附图13所示;波浪型碳毡的层数越多其屏蔽效果越好,其中曲率半径为1mm的[0]4型四层碳毡结构在X波段的屏蔽效能为54-62dB,如附图14所示。使用该方法得到的多层碳毡结构达到高屏蔽效能、高吸收、低反射的效果。
实施例2
本实施例采用纤维长度8mm,单位面积重量5g/m2的碳毡作为功能体,采用聚乙烯作为基体,使用拉挤工艺制备6层单元波浪碳毡曲率半径为4mm的电磁屏蔽结构体,铺层角度为附图2(c)中的[0/90]3。胶黏剂为聚丁二烯。
步骤一:碳毡的预处理
基体树脂使用聚氯乙烯,用两层聚氯乙烯膜包覆碳毡形成三明治结构如附图6所示。然后把包覆好的碳毡和树脂膜放入如附图6中3所示的加热炉中进行预固化辊压,预固化温度为140℃。
步骤二;单层波浪型碳毡的拉挤工艺成型
在平板型模具中间放入预处理完成的碳毡与树脂膜,调节加热棒使固化温度为150℃,同时调节牵引速率为800mm/min。固化完成后取出单层波浪形碳毡裁剪成所需尺寸待用。
步骤三:多层波浪型结构碳毡的制备
使用聚丁二烯胶,按照附图2(b)所示组合方式对六层波浪形碳毡进行粘结,最终得到[0/90]3型六层波浪型碳毡结构体。
使用该方法得到的多层碳毡结构的屏蔽效能有着与实施例1相类似的规律,同时使用拉挤工艺成型效率更高。
实施例3
本实施例采用纤维长度8mm,单位面积重量5g/m2的碳毡作为功能体,采用聚乙烯作为基体,使用辊压成型工艺制备6层单元波浪碳毡曲率半径为4mm的电磁屏蔽结构体,铺层角度为附图2(b)中的[0/45]3。胶黏剂为聚丁二烯。
步骤一:碳毡的预处理
基体树脂使用聚氯乙烯,用两层聚氯乙烯膜包覆碳毡形成三明治结构如附图7所示,然后把包覆好的碳毡和树脂膜放入如附图7中3所示的加热炉中进行预固化辊压,预固化温度为140℃。
步骤二;单层波浪型碳毡的辊压成型
如附图7所示在上下锻辊中间放入预处理完成的碳毡与树脂膜,调整辊压速率为6000mm/min。固化完成后取出单层波浪形碳毡裁剪成所需尺寸待用。
步骤三:多层波浪型结构碳毡的制备
使用聚丁二烯胶,按照附图2(b)所示组合方式对六层波浪形碳毡进行粘结,最终得到[0/45]3型六层波浪型碳毡结构体。
使用该方法制备的多层波浪型碳毡结构的屏蔽效能有着和实施例1相类似的规律,同时辊压成型工艺有生产效率高、材料利用率高、模具可更换、成本低、适合大规模生产等优势。
以上以附图说明的方式对本发明作了描述,本领域的技术人员应当理解,本公开不限于以上描述的实施例,在不偏离本发明的范围的情况下,可以做出各种变化、改变和替换。
Claims (10)
1.一种波浪型碳毡电磁屏蔽结构体,其特征在于,所述结构体采用多层波浪型碳毡按照一定的角度组合,所述多层波浪型碳毡采用胶黏剂粘结,所述波浪型碳毡以树脂为基体,碳纤维毡为功能体;所述树脂是热固性树脂、热塑性树脂以及本征导电高分子中的一种或多种。
2.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,所述热固性树脂为不饱和聚酯树脂、环氧树脂、酚醛树脂、三聚氰胺甲醛树脂、呋喃树脂、聚丁二烯树脂、有机硅树脂中的一种或多种;所述热塑性树脂为聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、聚酰胺、聚甲醛、聚碳酸酯、聚苯醚、聚砜中的一种或多种;所述本征导电高分子为聚吡咯、聚苯胺、聚乙炔中的一种或多种。
3.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,当所述树脂采用热固性树脂时,采用同种类的树脂作为胶黏剂;当所述树脂采用热塑性树脂时,所述胶黏剂选自聚丁二烯、有机硅、丙烯酸酯、聚氨酯、改性酚醛树脂、环氧聚氨酯中的一种或多种。
4.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,波浪型碳毡的曲率半径与电磁波波长接近。
5.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,所述碳毡选用湿法成型的短切碳纤维毡。
6.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,所述碳毡选用针刺法制备的碳纤维毡。
7.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,所述碳毡选用预氧化丝毡碳化法制备的碳纤维毡。
8.根据权利要求1所述的波浪型碳毡电磁屏蔽结构体,其特征在于,所述碳毡选用聚丙烯腈纤维毡预氧化/碳化法制备的碳纤维毡。
9.权利要求1-8任一项所述的波浪型碳毡电磁屏蔽结构体的制备方法,其特征在于,所述结构体采用模压成型、拉挤成型或者辊压成型。
10.权利要求1-8任一项所述的波浪型碳毡电磁屏蔽结构体的用途,其特征在于,所述结构体应用于方舱、屏蔽室墙面或屏蔽门领域。
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