CN105835429A - 微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料及其制备方法 - Google Patents
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Abstract
本发明公开了一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料,包括:聚氨酯泡棉层和膨体聚四氟乙烯微孔薄膜层,所述膨体聚四氟乙烯微孔薄膜层复合于聚氨酯泡棉层的一侧或两侧表面,两者之间通过粘结层连接;制备方法,包括以下步骤:制备膨体聚四氟乙烯微孔薄膜和聚氨酯泡棉;在聚氨酯泡棉上喷热熔胶粉或胶粘剂;将膨体聚四氟乙烯微孔薄膜覆盖在聚氨酯泡棉上,加热滚压使得两者贴合牢固。通过上述方式,本发明隔声降噪效果明显,没有新增重量,为实现工程机械的轻量化创造了节能和环保达标的条件;表面拒油拒水抗污染能力强,适合工程机械在恶劣的气候环境中使用,且能够充分发挥强吸声和隔声的效果。
Description
技术领域
本发明涉及吸声降噪领域,特别是涉及一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料及其制备方法。
背景技术
工程机械行业是我国改革开放以来发展最快、对国家基础设施建设影响最大的行业之一,其产品已成为出口创汇的主力产品之一,我国也已成为名副其实的工程机械制造大国。但我国工程机械产品的总体水平与发达国家相比仍然要落后10年~15年,尤其涉及工程机械安全防护、噪声排放、振动-人机工效学等方面的水平与世界工程机械制造强国还存在较大差距,产品难以批量进入这些发达地区的市场。
因此,限制和减少工程机械噪声,对安全、环保和操作者的听力健康、提高工程机械产品的市场竞争力都具有重要意义。由于工程机械的作业工况恶劣、动力和工作装置(发动机、液力系及传动系等)振动,故作业时会产生强烈的振动和噪声。随着现代化建设工程发展,工程机械愈来愈向着复杂化、大型化和高速化方向发展,其振动和噪声问题显得更加突出,建设施工的噪声已成为城市的主要噪声源之一。
分析发动机、液压传动系统、冷却风扇等这些噪声源的频谱及低、中、高频段的能量比率。结果表明,各声源最大声压级所在频段以中低频段最多。机械噪声无论是对人、动物、建筑物还是工程机械设备本身,都构成了一定的危害,它不仅污染环境,影响人们的日常生活,严重时还可能引起工程事故的发生。
目前工程上一般采用微穿孔板共振吸声结构和普通聚氨酯泡棉吸声降噪,这两种的降噪效果一般,工程机械的噪声还是在85dB以上,难以满足欧洲最新噪声限值标准及GB16710-2010 土方机械噪声限值标准要求。
发明内容
本发明主要解决的技术问题是提供一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料及其制备方法,能够治理工程机械产生的中低频段噪声污染将取得优秀的效果,降低噪声疲劳引发的事故,使得我国工程机械产品噪声符合欧洲和国标的排放标准。
为解决上述技术问题,本发明采用的一个技术方案是:提供一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料,包括:聚氨酯泡棉层和膨体聚四氟乙烯微孔薄膜层,所述膨体聚四氟乙烯微孔薄膜层复合于聚氨酯泡棉层的一侧或两侧表面,两者之间通过粘结层连接。
在本发明一个较佳实施例中,所述粘结层为胶粘层或热熔粘结层。
为解决上述技术问题,本发明采用的另一个技术方案是:提供一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备方法,包括以下步骤:
1)制备膨体聚四氟乙烯微孔薄膜和聚氨酯泡棉;
2)在聚氨酯泡棉上喷热熔胶粉或胶粘剂;
3)将膨体聚四氟乙烯微孔薄膜覆盖在聚氨酯泡棉上,加热滚压使得两者贴合牢固;
4)检验合格后收卷,则完成了微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备。
在本发明一个较佳实施例中,膨体聚四氟乙烯微孔薄膜的制备方法为:
1)将聚四氟乙烯分散树脂与液体助挤剂混合,并进行保温熟成;
2)将完成熟成的材料压成柱体毛坯,再将柱体毛坯制成薄片;
3)经加热脱去助挤剂,进行单向拉伸、双向拉伸、热定型、冷却后收卷则制得膨体聚四氟乙烯微孔薄膜。
在本发明一个较佳实施例中,还包括将膨体聚四氟乙烯微孔薄膜进行拒油拒水处理步骤:将完成制备的膨体聚四氟乙烯微孔薄膜放卷,对薄膜用全氟辛酸拒水拒油整理剂刷涂,进行化学改性处理,经50℃-80℃低温烘干,检验合格后收卷。
在本发明一个较佳实施例中,步骤1)中熟成的温度为30℃-35℃。
本发明的有益效果是:本发明将不同厚度的膨体聚四氟乙烯微孔薄膜与聚氨酯通过热熔粉或胶粘剂复合在一起,隔声降噪效果明显;没有新增重量,为实现工程机械的轻量化创造了节能和环保达标的条件。表面拒油拒水抗污染能力强,适合工程机械在恶劣的气候环境中使用,且能够充分发挥强吸声和隔声的效果。
附图说明
为了更清楚地说明本发明实施例中的技术方案,下面将对实施例描述中所需要使用的附图作简单地介绍,显而易见地,下面描述中的附图仅仅是本发明的一些实施例,对于本领域普通技术人员来讲,在不付出创造性劳动的前提下,还可以根据这些附图获得其它的附图,其中:
图1是本发明微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料一较佳实施例的结构示意图;
图2是本发明微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料另一较佳实施例的结构示意图;
图3是本发明中微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的优秀的中低频段吸声系数的图表;
图4是本发明中微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的中低频段兼具隔声效果的数据图表。
具体实施方式
下面将对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅是本发明的一部分实施例,而不是全部的实施例。基于本发明中的实施例,本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例,都属于本发明保护的范围。
请参阅图1和图2,本发明实施例包括:
一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料,包括:聚氨酯泡棉层3和膨体聚四氟乙烯微孔薄膜层1,如图1和图2所示,所述膨体聚四氟乙烯微孔薄膜层1复合于聚氨酯泡棉层3的一侧或两侧表面。
两者之间通过粘结层2连接。所述粘结层2为胶粘层或热熔粘结层。
膨体聚四氟乙烯高性能纤维的微孔膜,该多孔材料中92%以上是0~15微米孔径构成的细微的、互相连通的多层异形孔径的空腔,当噪声波传入这些微空腔后,这些微孔腔对其孔内振动着的空气分子与微纤维产生更大的粘滞阻力和摩擦力作用,使分子的振动动能转变为热能而使声能急剧大幅度衰减,大幅衰减后的噪声波紧接着传入聚氨酯泡棉内部有均匀的微型蜂窝状微孔腔内进一步衰减成热能,所以膨体聚四氟乙烯多层高性能纤维的微孔膜与聚氨酯泡棉复合后的组合新材料表现出了优秀的吸声降噪能力,实验表明对中低频段噪声降噪更佳。
聚氨酯泡棉具有超强耐冲击防震性能,内部有均匀的微型蜂窝状微孔腔和较高的排斥力,高变形条件仍具有优异的尺寸稳定性,不含污染性化学的和变形的可塑剂,不会对其它接触材料产生污染,保持高物理性,没有腐蚀性气体产生。有一般的吸声效果。
本发明将不同厚度的膨体聚四氟乙烯微孔薄膜与聚氨酯泡棉通过热熔粉或胶粘剂复合在一起用来治理工程机械产生的中低频段噪声污染将取得优秀的效果,使得人们在良好的环境中愉快的工作,降低噪声疲劳引发的事故,使得我国工程机械产品噪声符合欧洲和国标的排放标准,提高工程机械产品国际贸易竞争力的重要新材料保证。
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备方法,包括以下步骤:
1)制备膨体聚四氟乙烯微孔薄膜和聚氨酯泡棉;
2)在聚氨酯泡棉上喷热熔胶粉或胶粘剂;
3)将膨体聚四氟乙烯微孔薄膜覆盖在聚氨酯泡棉上,加热滚压使得两者贴合牢固;
4)检验合格后收卷,则完成了微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备。
其中,膨体聚四氟乙烯微孔薄膜的制备方法为:
1)将聚四氟乙烯分散树脂与液体助挤剂混合,并进行保温熟成,熟成的温度为30℃-35℃,优选为32℃;
2)将完成熟成的材料压成柱体毛坯,再将柱体毛坯制成薄片;
3)经加热脱去助挤剂,进行单向拉伸、双向拉伸、热定型、冷却后收卷则制得膨体聚四氟乙烯微孔薄膜。
还包括将膨体聚四氟乙烯微孔薄膜进行拒油拒水处理步骤:将完成制备的膨体聚四氟乙烯微孔薄膜放卷,对薄膜用全氟辛酸拒水拒油整理剂刷涂,进行化学改性处理,经50℃-80℃低温烘干,检验合格后收卷。
将不同厚度的膨体聚四氟乙烯微孔薄膜与聚氨酯通过热熔粉或胶粘剂复合在一起,按GB/T 18696.2-2002(ISO 10534-2:1998)《声学阻抗管中吸声系数和声阻抗的测量第2部分 传递函数法》制样和测量吸声系数,发现中低频段吸声系数优秀的组合材料,有针对性用来解决工程机械的中低频段的吸声降噪问题。
驻波管法测试仪器特点:
Z系列阻抗管用于测定垂直入射条件下吸声材料的吸声系数。整套系统由驻波管、高端传声器、数据采集卡、电脑等组成。测试仪软件根据测量到的峰声级值和谷声级值自动计算出吸声系数,并能生成吸声系数与频率的坐标曲线。仪器输出信号的频率和幅度在规定范围内可自由设定。由于只需少量的吸声材料作试件,所以对于吸声材料的参数研究和设计特别适合。
Z系列阻抗管系统依据国家标准GB/T18696.2-2002《阻抗管中吸声系数和声阻抗声学的测量第2部分:传递函数法》及ISO10534-2:1998,测试常用建筑吸声材料、汽车内饰材料、工业吸声材料等各种材料的吸声系数。相对于驻波管的驻波比法有测试时间短、频谱连续、重复性好等特点。尤其是进行材料研究时可大大提高对比实验的效率。
使用特点:
1、可同时测试全频段的吸声和隔声系数;
2、采用高档喇叭产生稳定、持续的声源信号;
3、直接生成1/3倍频程的吸声系数频谱图;
4、采用高端1/4英寸高匹配相位传声器,可自动校准传声器;
5、可直接生产测试报告,并进行比对;
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的优秀的中低频段吸声系数图表成果:
上述试验参数图表表明,膨体聚四氟乙烯微孔薄膜与聚氨酯通过热熔粉或胶粘剂复合的组合材料在中低频段具有先进的吸声系数,吸声系数已远高于国外著名厂商的技术指标。
2)将不同厚度的膨体聚四氟乙烯微孔薄膜与聚氨酯通过热熔粉或胶粘剂复合在一起,按GB/T 18696.2-2002(ISO 10534-2:1998)《声学阻抗管中吸声系数和声阻抗的测量第2部分 传递函数法》制样和测量隔声系数,发现中低频段吸声系数优秀的组合材料在隔声方面的性能,有针对性用来解决工程机械的中低频段的吸声隔声降噪问题。
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的中低频段兼具隔声效果如图表所示:
上述试验参数图表表明,膨体聚四氟乙烯微孔薄膜与聚氨酯通过热熔粉或胶粘剂复合的组合材料在中低频段具有明显的隔声效果。
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的吸声降噪性能已超过国外的先进水平。
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的兼具明显的隔声降噪效果 。
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料没有新增重量,为实现工程机械的轻量化创造了节能和环保达标的条件。
微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的表面拒油拒水抗污染能力强,适合工程机械在恶劣的气候环境中使用,且能够充分发挥强吸声和隔声的效果。
以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书内容所作的等效结构或等效流程变换,或直接或间接运用在其它相关的技术领域,均同理包括在本发明的专利保护范围内。
Claims (6)
1.一种微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料,其特征在于,包括:聚氨酯泡棉层和膨体聚四氟乙烯微孔薄膜层,所述膨体聚四氟乙烯微孔薄膜层复合于聚氨酯泡棉层的一侧或两侧表面,两者之间通过粘结层连接。
2.根据权利要求1所述的微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料,其特征在于,所述粘结层为胶粘层或热熔粘结层。
3.根据权利要求1所述的微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备方法,其特征在于,包括以下步骤:
1)制备膨体聚四氟乙烯微孔薄膜和聚氨酯泡棉;
2)在聚氨酯泡棉上喷热熔胶粉或胶粘剂;
3)将膨体聚四氟乙烯微孔薄膜覆盖在聚氨酯泡棉上,加热滚压使得两者贴合牢固;
4)检验合格后收卷,则完成了微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备。
4.根据权利要求3所述的微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备方法,其特征在于,膨体聚四氟乙烯微孔薄膜的制备方法为:
1)将聚四氟乙烯分散树脂与液体助挤剂混合,并进行保温熟成;
2)将完成熟成的材料压成柱体毛坯,再将柱体毛坯制成薄片;
3)经加热脱去助挤剂,进行单向拉伸、双向拉伸、热定型、冷却后收卷则制得膨体聚四氟乙烯微孔薄膜。
5.根据权利要求4所述的微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备方法,其特征在于,还包括将膨体聚四氟乙烯微孔薄膜进行拒油拒水处理步骤:将完成制备的膨体聚四氟乙烯微孔薄膜放卷,对薄膜用全氟辛酸拒水拒油整理剂刷涂,进行化学改性处理,经50℃-80℃低温烘干,检验合格后收卷。
6.根据权利要求4所述的微孔膜与聚氨酯泡棉复合的中低频段高吸声降噪材料的制备方法,其特征在于,步骤1)中熟成的温度为30℃-35℃。
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