CN101111365A - 塑料中空体,特别是塑料管 - Google Patents
塑料中空体,特别是塑料管 Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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Landscapes
- Engineering & Computer Science (AREA)
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Abstract
本发明涉及一种塑料中空体,特别是塑料管,其壁由相互连接的圆柱体状层构成,其中至少一个层是通过离心法由刚性体制成的层,并且至少一个层由塑性体组成。
Description
本发明涉及一种塑料中空体,特别是塑料管。
已知塑料管有着各种实施方式。例如它们可用于输送液体和气体。但是它们也可以满足建筑物理学任务的需要,或可以用于使电缆或类似物通过其中。
基于标准化的标称直径,用常规聚合材料制造的管道具有大的壁厚。实施这种壁厚的设计尤其要考虑下列因素如材料的性质、各自的操作压力、操作温度、安装条件、对于形变的安全性、期望的使用寿命等。大的管道壁厚在流动效率、管重量以及材料成本方面具有缺陷。特别是由于壁厚的原因管的生产速率同样受到限制。
在EP0360758B1中已知例如作为排水管的具有由圆柱体层相互连结的管壁结构的塑料管。管中所有的层包括聚酯树脂,即一种刚性体(Duromer)。内层仅由经固化的聚酯树脂组成,而管道外层则是由固化的聚酯树脂和填充物如石英砂的混合物形成。内层和外层间的层除了聚酯树脂外还可以包括不同比例的填充物和/或玻璃纤维。
已知的管道通过离心铸造工艺制得,这同样在EP0360758B1中有公开。在本发明内容中将其引作参考。
该工艺的本质特征是:为了形成各层,要将基础原料——即可固化的聚酯树脂、填充物以及玻璃纤维——以不同的质量比通过所谓的给料器供入到旋转模中。通过固化树脂,管随后具有稳定性。
由此可以制备得具有6米及以上长度的管(管件)。管直径可以很小(如10或30厘米),但是同样也可以达数米。
各层的数量和组成尤其可以取决于管的尺寸和其用途。现有技术示例性描述了液体在压力条件下流过其中的“压力管”与例如前面提及的排水管的“无压管”两者间的区别。
在大多数应用中管置于地下,并且受到不同机械应力的作用。这使得必须让这种本身坚固的管道具有一定的弹性,以例如避免冲击应力下造成的破坏。
在现有技术中,通过使管道的各层除了聚酯树脂外还具有不同的其他成分,从而就兼顾到了这些标准。依据EP0360758B1,一些层由聚酯树脂制成,其他一些由聚酯树脂和玻璃纤维构成,还有一些由聚酯树脂、玻璃纤维和填料构成。通过在制备过程中改变模具的旋转,可以在最终固化前使各个层密实。
除此之外,例如塑料压力软管也是公知的。其合成材料为如聚酯。为了达到加固的目的,可以通过混入芳酰胺织物作为配筋(加固体)。
具有由芳酰胺构成的配筋(加固体)纤维的聚烯烃管,或者具有钢丝加固的聚烯烃管同样属于现有技术。
本发明的目的在于提供一种所述类型的塑料管道,它应显示出在高材料强度下有着有利的延展性、抵抗形变的安全性,以及长期强度,以便可用于不同领域。
现有技术中已知的是由塑性体(Plastomer)构成的塑料管。这里,“塑性体”代表了未交联的并因此而具有塑性或可塑性的热塑性材料。因此,这些热塑性材料与前文所提到的、致密(engmaschig)交联且固化的热固性塑料的通称的“刚性体(Duromer)”是不同的。但是,由比如聚氯乙烯,聚丙烯或者聚乙烯的热塑性塑料制成的这些管,只具有相对小的强度,并且无法较为经济的用作在诸如市政供水和污水排放这类较大型的管。同时,所需的大壁厚也是不利因素。
相反的是,在本发明的大部分一般实施方案中,本发明设计了这样的塑料中空体,特别是塑料管,这种管的管壁是由互相连结的圆柱状层构成,其中至少一层由刚性体组成,并且至少一层另外的层由塑性体组成。
相应地,本发明的塑料管可以设计成复合管,其中热固性塑料层和热塑性塑料层交替排列。
通过这种方法,热固性塑料的有益特性可以和热塑性塑料的有益特性协同增效地结合起来。
可固化的合成树脂(例如可固化的聚酯树脂)可以作为刚性体来构成相应的层。
塑性体可以是选自下列的热塑性塑料:聚乙烯(PE),聚丙烯(PP),聚氯乙烯(PVC),聚苯乙烯(PS),聚苯醚(PPO),聚苯硫醚(PPS),聚苯砜(PSO,PES),聚酰亚胺(PI),聚酰胺(PA),聚甲醛(POM),聚丁烯(PB),聚对苯二甲酸乙二醇酯(PETP)。
根据一个实施方案,塑料管(比如常规的基于聚酯树脂的离心塑料管)由多个层构成,例如3至20层,其中由刚性体构成的层规则或无规则地交替分布在塑性体构成的层之间或正好相反。每层的厚度可以为0.1mm至50mm,其可以限制在≤10mm或≤2mm。
优选使塑料管的外层或内层由塑性体构成。较外部的塑性体层可以针对冲击应力提供良好保护,而较内的塑性体层则可以降低摩擦并且对于通过管道传输的饮用水来说也是没有问题的。
本发明不单单局限为使用不同的材料对来构造各层。更多情况下还可以同时进行进一步优化。比如使一个或多个层具有配筋(加固体)。这种配筋可以比如由热塑性和高拉伸的带材组成。这些带材上可以施涂以偶联剂(Haftvermittler),用以使其与周围的塑料材料的粘结性最优化。这些带材可以是扁平带或者是模压带(Profilbnder)。备选或累积地,也可使用纤维作为配筋。这些纤维可以是短切纤维。它们可以随机或者有序的混入并分散于各层的塑料材料中。其中的关键是要使得纤维材料或带材与包覆的塑料材料相结合。
根据ISO 527测定,加固材料的拉伸强度(23℃下测定)>250MPa。加固体的弹性模量应至少是需加固层的1.5倍,最好是至少≥5或≥10倍。
加固体也可以是螺旋状的,网状的,网格状的,筛状的或者条带状的。加固材料可以是经纺的或者经编结的。扁平的或者模压成形的部分也可以由层叠粘结的条或带材构成。预成形的加固体可以置于已经成形的管道层之上,或者被压入其中。相反的,也可以例如由网状加固体出发加工成圆柱体形,并接着用所需的塑料“浸渍”该结构体,这样加固体中或加固部件之间的空隙就被填充物至少部分地填满。根据本发明一个重要的实施方案,要给至少一层热固性层配筋,或者加固体在两种热固性层之间。
在这种情况下,热塑性加固材料,例如高拉伸强度聚乙烯也是合适的。同样合适的还有例如聚丙烯,聚酰胺和其他在权利要求4中提到的材料。加固体或加固层也可由多种加固元素,例如多种栅格网络构成,并且用于构成塑料管的多个层。为了使配筋与周围的塑料材料之间获得良好的结合,加固体内的开孔(Durchbrechung)或相邻的加固部件之间的间隙的大小应能使相应的粘性形式的塑料材料能渗入并刻完全包裹住加固体。但是也可以选择“栅格间距”,以便管壁材料在应用时能抵抗最大的内部压力。
从外向内看,可以例如构成以下的层结构,其中包含有刚性体的层以下称为D,而包含有塑性体的层以下称为P。B代表配筋(加固体)。加固体部分或全部分布在内部或外部相邻的层内。
实例1 P-D-D-B-D-P-D-P-P-D
实例2 P-D-P-B-D-P-D-P
实例3 P-D-D-P-D-P
实例4 P-P-D-B-P-D-P-D
实例5 P-D-D-D-P-D-D-P。
各层可以通过摩擦和/或材料连接相互结合在一起。这种摩擦结合可以例如在相邻的D层之间以如下方式很容易的实现,其中在离心法中依次施加这些D层,使得在随后的热固性塑料固化过程中可以使相邻的层材料连接。离心法技术也为已知(例如EP 0 360 758 B1)。其内容也引入作为参考。
通过在两个层之间施加偶联剂也可以使得含有不同塑料的两个层之间实现摩擦结合。这对于D层和P层的连接尤其有效,但也可以应用在P层的相互连结上。类似地,如上所述对于B层同样如此。这种偶联剂可以是,比如,粘结膜或者所谓的熔膜。作为偶联剂也可以使用化学偶联剂,比如可聚合的聚酯或者橡胶衍生物。它们可以例如作为粘性粉末的形式涂覆在层的表面,然后再施加下一层。由于热固性塑料在固化时放热,偶联剂的粘结作用会最优化。马来酸酐也可以作为偶联剂,其优选用来粘合D层和P层或者B层。
相邻层之间的粘合也可以通过表面热处理(加热)或者高能辐射来实现。粘合物质也可以由比如LLDPE(线型低密度聚乙烯)和PP(聚丙烯)的混合物组成。在加热过程中,LLDPE会和相邻的PE层例如发生热合(VerschweiBung),而物质中的PP成分会与另一相邻的PP层实现良好的连接。
通过前面所述的例子可以看出,含有相同塑料基材的层可以设计成含有不同的其他组分的不同形式。因此,由刚性体构成的至少一层可以含有至少一种下列成分:石英砂,基于SiO2、MgO、CaO、Al2O3、MgCO3、CaCO3、Al(OH)3、CaSO4、BaSO4、滑石、高岭土或者是它们混合物的填料,玻璃纤维。根据前述的第一个实施例来进一步阐述本发明,现示例性说明如下:
实施例1a,P1-D1-D2-B-D3-P1-D3-P1-P2-D4
且
D1:由1重量份的固化聚酯树脂和3重量份的石英砂组成的层。
D2:由1重量份的固化聚酯树脂和2重量份的颗粒尺寸<0.3mm的碳酸钙填料组成的层。
B:由高拉伸强度PE带组成的加固体,其具有栅格状圆筒形,表面涂有含丙烯酸酯和马来酸酐的无规三元共聚物。
D3:由1重量份的固化聚酯树脂和0.3重量份长度<60mm的玻璃纤维组成的层。
P1:由聚丙烯组成的层。
P2:由聚苯硫醚组成的层。
D4:由固化聚酯树脂组成的层,该层D4中的聚酯树脂与其他D层中的聚酯树脂区别如下:
D4层中的弹性模量(根据ISO 527测定)为200MPa,而其他的D层弹性模量为2500MPa。D4层的断裂伸长率(根据ISO527,ISO178)为约50%,其他层仅为约5%。在实施例1a中,内侧可以有利地紧跟另一P层(P1)。
刚性体壁层起到了承载管(刚性)和从外将负荷施加到管子上的作用。因此,外部的刚性体层是非常重要的。在中间层或者内层中的上述方式的加固体可以明显提高内部抗压强度。内压可以为20bar且更大。而“内层”和“外层”在这里分别指代的是管壁厚中心(中间层)的两侧。
特别是当其设计有内和/或外的包覆层时,塑性体壁层起保护其免受机械冲击的作用。它们具有足够的冲击韧性和耐磨性。由于塑性体材料对饮用水无害性,特别有利地用作内层。同时热塑性材料还可以耐受化学试剂,紫外光,光和温度。
根据开头所述的离心法涂覆D层,而P层可通过不同的方式插入。B层的构造已经描述过。
在第一个实施方式中,热塑性塑料层是由软管构成,该软管借助于偶联剂热装在已经制好的热固性塑料层上。
在第二个实施方式例中,同样也是从已经至少有一层在使用热固性塑料条件下在离心法中得到的层的情况出发的。该层也可以是“软”的。接着将挤出的、预先褶皱的热塑性塑料制成的管导入模具中。随后使管“伸展(aufspringen)”,并由此重新呈现圆柱形,并且使其形成所需尺寸使得外层贴附在先前已经成型的热固性塑料层的内面上。如果外层还是“柔软”的(未固化),则这种结合力是特别强的。在此实施方式中,D层和P层之间的粘合通过偶联剂来支持。接下来的D层又可通过离心法施加。
在第三个实施方式中,热塑性塑料喷涂到已成形的层上。喷涂可以从外开始也可以从内进行,用以构成外的或内的其他层。
在第四个实施方式中,将热塑性塑料注射到位于先前已经构成的热固性塑料层和与此间隔的模板之间的环状空间中。接着撤掉模板。
在第五个实施方式中,为了构成热塑性的包覆层(被覆层),将热塑性膜热装或缠绕在现有层上。这里,塑料薄膜或薄片的缠绕可以采用直接挤出到现有层的方式进行。同样,也可以将热塑性外壳材料直接以环形挤出在管体上。
在第六个方案中,热塑性层通过“烧结”施加。为此,要将热塑性材料以粉末状材料涂覆并接着在温度作用下熔融。
本发明范畴内还可用填料或其他成分来完善含有热塑性塑料的层。这些“其他组分”包括,例如玻璃纤维,纺纱或者其他配筋材料。同样,热塑性层,特别是外层包覆层还可以发泡,从而能同时形成绝热层。
相邻两层之一的表面可以被型压,例如起绒,由此便利于粘结/固定。
同现有技术制得的塑料管相比,本发明所述的“复合管”即使在小的壁厚条件下也具有高的长期内部抗压强度。另外需要强调的是该管体具有有益的延展特性,同时还有足够的径向和轴向强度,此外还有防扩散性,断裂韧性以及抗化学物质性。根据各管的使用要求可以计算和调整各层的壁厚。同样的,对于可能的加固体种类、层数和厚度也可以如此。例如,管的延展性可以总体上通过不同的栅格状配筋的网眼间距来改变。
如果加固材料是具有开孔的圆筒状,即有网状的护套结构,则其就可以类似于第二实施方式地(如上所述)导入。当褶皱的圆筒伸展后,加固体就可以至少部分的混入到可变形的刚性体层中。
本发明同时还提出了设计其他功能性中间层的可能,比如,对于氧气或者水蒸气的阻隔层等。
Claims (19)
1.塑料中空体,特别是塑料管,其壁由相互连接的圆柱体状层构成,其中至少一个层是通过离心法由刚性体制成的层,并且至少一个层由塑性体组成。
2.根据权利要求1中的塑料中空体,其中刚性体为固化的合成树脂。
3.根据权利要求1中的塑料中空体,其中刚性体为固化的聚酯树脂。
4.根据权利要求1中的塑料中空体,其中塑性体是选自下列的热塑性塑料:聚烯烃、聚乙烯、聚丙烯、聚氯乙烯、聚苯乙烯、聚苯醚、聚苯硫醚、聚亚苯基砜、聚酰亚胺、聚酰胺、聚甲醛、聚丁烯、聚对苯二甲酸乙二醇酯。
5.根据权利要求1的具有多个层的塑料中空体,其中由刚性体组成的层规则或不规则地交替分布在由塑性体组成的层之间。
6.根据权利要求1的具有多个层的塑料中空体,其中由塑性体组成的层规则或不规则地交替分布在由刚性体组成的层之间。
7.根据权利要求1的塑料中空体,其中至少一层包含加固体。
8.根据权利要求1的塑料中空体,其中至少一个由刚性体组成的层含有加固体。
9.根据权利要求1的塑料中空体,其中至少一层包含螺旋状、网状或栅格状、筛状或条状的加固体。
10.根据权利要求7的塑料中空体,其中加固体由栅格状圆柱体构成。
11.根据权利要求1的塑料中空体,其中至少一层设计为网状或栅格状形式,并且网络或栅格中的开孔至少部分地为塑料材料填充。
12.根据权利要求1的塑料中空体,其中各层靠摩擦力彼此连接。
13.根据权利要求1的塑料中空体,其中通过偶联剂靠摩擦力彼此连接。
14.根据权利要求1的塑料中空体,其中至少一层由刚性体组成的层含有至少一种以下的其他组分:石英砂,基于SiO2、MgO、CaO、Al2O3、MgCO3、CaCO3、Al(OH)3、CaSO4、BaSO4、滑石、高岭土或者它们混合物的填料,玻璃纤维。
15.根据权利要求1的塑料中空体,其外被覆层由塑性体组成。
16.根据权利要求1的塑料中空体,其内被覆层由塑性体组成。
17.根据权利要求7的塑料中空体,其中加固体具有至少一种以下的形式:带材、长丝、型材、栅格、纤维。
18.根据权利要求7的塑料中空体,其中加固体由选自下列的至少一种材料组成:PE、PP、PET、PA。
19.根据权利要求7的塑料中空体,其中,加固体涂覆以至少一种下列材料:偶联剂、PE、PP。
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JP2004330559A (ja) * | 2003-05-06 | 2004-11-25 | Ube Nitto Kasei Co Ltd | 繊維強化中空構造体の製造方法 |
-
2004
- 2004-12-03 AT AT0088004U patent/AT8149U1/de not_active IP Right Cessation
-
2005
- 2005-10-27 CN CNA2005800476182A patent/CN101111365A/zh active Pending
- 2005-10-27 AU AU2005312130A patent/AU2005312130B2/en not_active Ceased
- 2005-10-27 JP JP2007543715A patent/JP2008521650A/ja active Pending
- 2005-10-27 WO PCT/EP2005/011500 patent/WO2006058585A1/de active Application Filing
- 2005-10-27 US US11/792,177 patent/US8137780B2/en not_active Expired - Fee Related
- 2005-10-27 RU RU2007124693/12A patent/RU2007124693A/ru unknown
- 2005-10-27 EP EP05806345A patent/EP1827811A1/de not_active Withdrawn
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2007
- 2007-07-03 KR KR1020077015228A patent/KR100917943B1/ko not_active IP Right Cessation
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN105881989A (zh) * | 2014-10-21 | 2016-08-24 | 廖树汉 | 抗虫蚁不怕水浸泡的木夹管壁管 |
Also Published As
Publication number | Publication date |
---|---|
AT8149U1 (de) | 2006-02-15 |
JP2008521650A (ja) | 2008-06-26 |
AU2005312130A1 (en) | 2006-06-08 |
KR20070092257A (ko) | 2007-09-12 |
US20080187696A1 (en) | 2008-08-07 |
KR100917943B1 (ko) | 2009-09-21 |
RU2007124693A (ru) | 2009-01-10 |
EP1827811A1 (de) | 2007-09-05 |
US8137780B2 (en) | 2012-03-20 |
WO2006058585A1 (de) | 2006-06-08 |
AU2005312130B2 (en) | 2011-01-06 |
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