CN109501424A - 一种ptfe复合密封垫片及其制备工艺 - Google Patents
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- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
- B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
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Abstract
本发明公开了一种PTFE复合密封垫片及其制备工艺,包括:由PTFE车削板所构成的支承层,该支承层的厚度为0.8mm~1.2mm,优选厚度为1mm;以及与所述支承层侧面相邻的一层或多层PTFE密封层,该PTFE密封层由若干层PTFE微孔膜热压复合组成,每层PTFE微孔膜的厚度为0.01mm~0.03mm。本发明有效地解决了现有技术中所出现的泄漏问题。
Description
技术领域
本发明涉及复合密封垫片,更具体地说,涉及一种PTFE复合密封垫片及其制备工艺。
背景技术
PTFE复合密封垫片具有耐高温性,可在-20℃~200℃环境中使用,耐强氧化剂、耐油、耐酸碱。通常用于高温,高真空及高压环境中,也适宜于油类环境。由于其具有各种优异的性能,所以PTFE复合垫片广泛地用于石油、化工、航空、航天等部门。
现有常用的PTFE复合密封垫片有两种:一种是PTFE车削板,主要采用PTFE悬浮料压制后烧结成圆柱体的预制坯料,然后将预制坯料放置到车床上进行车削成型;另一种是PTFE膨体垫片,主要采用若干层PTFE微孔薄膜(每层厚度在0.01mm~0.03mm),在每层PTFE微孔薄膜涂上胶水后然后将每层PTFE微孔薄膜叠加复合成型。
流体的密封就是通过密封件和密封元件间的相互紧密接触,依靠密封元件的弹塑性变形,减小泄漏通道,以增加流动阻力来实现的。但是,上述的两种类型的密封垫片在使用过程中均会产生泄漏等不良现象,尤其是在高温高压的情况下,泄漏现象甚为严重。究其原因,第一种PTFE车削板与被密封件接触后,在遇到高温高压状况时,密封元件与被密封件接触面之间的间隙中产生泄漏,形成界面泄漏;而第二种PTFE膨体垫片其结构是由多层PTFE微孔膜复合组成,在遇到高温高压状况时,流体会通过PTFE微孔膜本体内部微孔而产生的渗透泄漏。
发明内容
针对现有技术中存在的上述缺陷,本发明的目的是提供一种PTFE复合密封垫片及其制备工艺,有效地解决了现有技术中所出现的泄漏问题。
为实现上述目的,本发明采用如下技术方案:
一方面,一种PTFE复合密封垫片,包括:
由PTFE车削板所构成的支承层,该支承层的厚度为0.8mm~1.2mm,优选厚度为1mm;以及
与所述支承层侧面相邻的一层或多层PTFE密封层,该PTFE密封层由若干层PTFE微孔膜热压复合组成,每层PTFE微孔膜的厚度为0.01mm~0.03mm。
所述支承层的密度为2.1g/cm3~2.2g/cm3。
所述PTFE密封层的密度为0.6g/cm3~0.8g/cm3。
另一方面,一种PTFE复合密封垫片的制备工艺,包括以下步骤:
1)将PTFE微孔膜进行正反卷绕,后再进行双边固定;
2)将步骤1)所得PTFE微孔膜卷放置于热压复合机上进行第一次烧结、复合,后再进行第二次烧结、复合,形成PTFE密封层;
3)将步骤2)所得PTFE密封层分别贴合于支承层的两侧面,并再一同放置于热压复合机上进行第三次烧结、复合。
所述每层PTFE微孔膜的厚度为0.01mm~0.03mm,孔隙率为50%~90%。
所述第一次烧结、复合,具体为:
升温至250℃时,保温1小时;
升温至330℃~350℃时,烧结2小时。
所述第二次烧结、复合,具体为:
升温至350℃~390℃时,烧结2~3小时。
所述第三次烧结、复合,具体为:
升温至300℃~350℃时,烧结1~2小时。
所述复合压力均为0.01kg~3kg,升温速度均为10℃~20℃/min。
在上述的技术方案中,本发明所提供的一种PTFE复合密封垫片及其制备工艺,该PTFE复合密封垫片采用不同类型的PTFE进行复合制成,使其的密度可达0.9g/cm3~1.3g/cm3,具有非常好的耐化学性能、耐高温和耐磨性,同时其还具有非常好的抗蠕变性,在高温高压环境下也不会产生变形。且该PTFE复合密封垫片在制备工艺中又很好的杜绝了微孔渗透的现象,从而从根本上解决了现有技术中出现的界面泄漏和渗透泄漏现象。
附图说明
图1是现有PTFE膨体垫片复合前进行紧固的示意图;
图2是本发明PTFE复合密封垫片的横截面侧视图;
图3是本发明PTFE复合密封垫片制备工艺的流程图。
具体实施方式
下面结合附图和实施例进一步说明本发明的技术方案。
请结合图2所示,本发明所提供的一种PTFE复合密封垫片,包括:
由PTFE车削板所构成的支承层1,该支承层1的厚度为0.8mm~1.2mm,优选厚度为1mm;以及
与所述支承层1的两侧面相邻的一层或多层PTFE密封层2,该PTFE密封层2由若干层PTFE微孔膜通过热压复合组成,每层PTFE微孔膜的厚度为0.01mm~0.03mm。
较佳的,所述支承层1的密度在2.1g/cm3~2.2g/cm3之间,具有较高的硬度。
较佳的,所述PTFE密封层2的密度在0.6g/cm3~0.8g/cm3之间,具有一定的弹性。
请结合图3所示,本发明还提供了一种PTFE复合密封垫片的制备工艺,包括以下步骤:
1)将PTFE微孔膜先进行正反卷绕,后再进行双边固定,现有的PTFE膨体垫片在热复合前,是先将若干层PTFE微孔膜叠加后,采用螺栓四边紧固(如图1所示),而本发明工艺只需采用螺栓两边紧固即可;
2)将步骤1)所得PTFE微孔膜卷放置于热压复合机上进行第一次烧结、复合,后再进行第二次烧结、复合,形成PTFE密封层2,可直接省去现有技术工艺中的涂胶步骤;
3)将步骤2)所得PTFE密封层2分别贴合于支承层1的两侧面,并再一同放置于热压复合机上进行第三次烧结、复合,得到最终本发明的PTFE复合密封垫片。
较佳的,所述每层PTFE微孔膜的厚度在0.01mm~0.03mm之间,孔隙率在50%~90%之间。
较佳的,所述PTFE微孔膜卷放置于热压复合机上进行第一次烧结、复合时,具体为:
将热压复合机上的上、下模板升温至250℃时,保温1小时;
再将热压复合机上的上、下模板升温至330℃~350℃时,烧结2小时。
较佳的,所述PTFE微孔膜卷放置于热压复合机上进行第二次烧结、复合,具体为:
将热压复合机上的上、下模板升温至350℃~390℃时,烧结2~3小时。
较佳的,所述将PTFE密封层2分别贴合于支承层1的两侧面,并再一同放置于热压复合机上进行第三次烧结、复合,具体为:
将热压复合机上的上、下模板升温至300℃~350℃时,烧结1~2小时。
较佳的,所述三次复合压力均为0.01kg~3kg,热压复合机上的上、下模板升温速度均为10℃~20℃/min。
综上所述,本发明的PTFE复合密封垫片具有非常好的耐化学性能、耐高温和耐磨性,同时其还具有非常好的抗蠕变性,在高温高压环境下也不会产生变形,特别适用于化工领域。且本发明的PTFE复合密封垫片制备工艺比现有技术的制备更加自动化,从而节省了劳动力。
本技术领域中的普通技术人员应当认识到,以上的实施例仅是用来说明本发明,而并非用作为对本发明的限定,只要在本发明的实质精神范围内,对以上所述实施例的变化、变型都将落在本发明的权利要求书范围内。
Claims (9)
1.一种PTFE复合密封垫片,其特征在于,包括:
由PTFE车削板所构成的支承层,该支承层的厚度为0.8mm~1.2mm,优选厚度为1mm;以及
与所述支承层侧面相邻的一层或多层PTFE密封层,该PTFE密封层由若干层PTFE微孔膜热压复合组成,每层PTFE微孔膜的厚度为0.01mm~0.03mm。
2.如权利要求1所述的一种PTFE复合密封垫片,其特征在于:所述支承层的密度为2.1g/cm3~2.2g/cm3。
3.如权利要求1所述的一种PTFE复合密封垫片,其特征在于:所述PTFE密封层的密度为0.6g/cm3~0.8g/cm3。
4.一种如权利要求1-3任一项所述PTFE复合密封垫片的制备工艺,其特征在于,包括以下步骤:
1)将PTFE微孔膜进行正反卷绕,后再进行双边固定;
2)将步骤1)所得PTFE微孔膜卷放置于热压复合机上进行第一次烧结、复合,后再进行第二次烧结、复合,形成PTFE密封层;
3)将步骤2)所得PTFE密封层分别贴合于支承层的两侧面,并再一同放置于热压复合机上进行第三次烧结、复合。
5.如权利要求4所述的一种PTFE复合密封垫片的制备工艺,其特征在于:所述每层PTFE微孔膜的厚度为0.01mm~0.03mm,孔隙率为50%~90%。
6.如权利要求4所述的一种PTFE复合密封垫片的制备工艺,其特征在于:所述第一次烧结、复合,具体为:
升温至250℃时,保温1小时;
升温至330℃~350℃时,烧结2小时。
7.如权利要求4所述的一种PTFE复合密封垫片的制备工艺,其特征在于:所述第二次烧结、复合,具体为:
升温至350℃~390℃时,烧结2~3小时。
8.如权利要求4所述的一种PTFE复合密封垫片的制备工艺,其特征在于:所述第三次烧结、复合,具体为:
升温至300℃~350℃时,烧结1~2小时。
9.如权利要求6-8任一项所述的一种PTFE复合密封垫片的制备工艺,其特征在于:所述复合压力均为0.01kg~3kg,升温速度均为10℃~20℃/min。
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