CN108372621A - 一种聚合物发泡成型装置 - Google Patents
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Abstract
本发明公开一种聚合物发泡成型装置,属于聚合物发泡成型设备技术领域;包括模具,所述模具包括上模和下模,所述上模和所述下模合模构成密闭的模腔,所述上模的外表面与所述下模的外表面上分别设置有射频电极A和射频电极B,还包括有射频电源,所述射频电极A和所述射频电极B经电缆分别与所述射频电源的正极和负极连接。与现有技术相比,本发明一种聚合物发泡成型装置,其加热均匀,加热速度快,高效发泡,节省发泡所需时间,提高生产效率,降低成本。
Description
技术领域
本发明涉及聚合物发泡成型设备技术领域,具体涉及的是一种利用射频加热方式实现聚合物发泡的装置。
背景技术
高分子聚合物发泡材料广泛应用于隔热、隔音、减震、制鞋等领域。目前常用的聚合物材料发泡方式有物理发泡和化学发泡。化学发泡法是指将化学发泡剂与聚合物材料共混后,在一定温度下,化学发泡剂受热分解,产生气体,膨胀,使聚合物材料发泡,目前加热方式主要还是电加热方式,由于电加热过程是通过热传导使聚合物材料加热,即首先通过电热板将模具加热,模具将热量再传递给模腔内的材料,存在能耗高,加热时间长,易出现局部加热温度过高而部分区域仍存在加热死角等问题。
鉴于此,本案发明人对上述问题进行深入研究,遂有本案产生。
发明内容
本发明的目的在于提供一种加热均匀,加热速度快,效率高的聚合物发泡成型装置。
为了达成上述目的,本发明的解决方案是:
一种聚合物发泡成型装置,包括模具,所述模具包括上模和下模,所述上模和所述下模合模构成密闭的模腔,所述上模的外表面与所述下模的外表面上分别设置有射频电极A和射频电极B,还包括有射频电源,所述射频电极A和所述射频电极B经电缆分别与所述射频电源的正极和负极连接。
优选的,所述射频电极A和所述射频电极B位于所述上模的外表面与所述下模的外表面上成相对设置。
优选的,所述电缆为具有屏蔽电池波功能的电缆。
优选的,所述上模和所述下模均为玻璃或塑料。
进一步优选的,所述上模和所述下模均具有多层结构,所述上模由多层玻璃和多层塑料粘合制成,所述下模由多层玻璃和多层塑料粘合制成。
采用上述技术方案,本发明的有益的效果是:
克服传统技术的缺陷,解决传统化学发泡中电加热过程中加热不均匀等技术问题,本发明加热均匀,加热速度快,高效发泡,节省发泡所需时间,提高生产效率,降低成本。
附图说明
为了易于说明,本发明由下述的具体实施方式及附图作以详细描述。
图1为本发明的结构示意图。
图中:
1-上模; 2-下模;
3-模腔;
4-射频电极A; 5-射频电极B;
6-电缆; 7-射频电源。
具体实施方式
为了进一步解释本发明的技术方案,下面通过具体实施例来对本发明进行详细阐述。
如图1所示,本发明的聚合物发泡成型装置,包括模具、射频电极A4、射频电极B5和射频电源7。所述上模1和所述下模2合模构成密闭的模腔3,射频电极A4和射频电极B5分别设置在所述上模1的外表面与所述下模2的外表面上,所述射频电极A4和所述射频电极B5经电缆6分别与所述射频电源7的正极和负极连接。本发明以室内电源或工业电源为射频电源7对射频电极A4和射频电极B5进行供电。
本发明中,优选的,所述射频电极A4和所述射频电极B5位于所述上模1的外表面与所述下模2的外表面上成相对设置。
本发明中,优选的,所述电缆6为具有屏蔽电池波功能的电缆6。电缆6也是常规的电力电缆中的一种,即:指常规电缆表面再裹一层金属网,起到电磁屏蔽作用的电缆。
上述中具体的:模具采用射频可以通过且无极性、不吸收射频的材料制成;由于所采用的模具无极性不会对射频电极A4和射频电极B5造成影响。该模具又不吸收射频,所以不会对射频电极A4和射频电极B5所产生的射频在通过模具时造成削减、削弱。本发明中,优选的,所述上模1和所述下模2均可以选用玻璃、塑料,还可以选用由玻璃和塑料粘合制成。当所述上模1和所述下模2选用由玻璃和塑料粘合制成时,所述上模1和所述下模2具有多层结构(即:所述上模1由多层玻璃和多层塑料粘合制成,所述下模2由多层玻璃和多层塑料粘合制成)。主要是因为聚合物材料在发泡时对模具有特殊的要求,必须是能够穿透微波的材料,才能用于制作模具,比如金属材料就不能作为模具使用,这就极大的限制了射频加热的应用,因为许多聚合物材料发泡成产品的过程中,要求模具由足够的耐压,耐温等性能。因此本发明中,模具选用玻璃、塑料或由玻璃和塑料制成的多层结构。所以更加安全。另外,本发明的结构比较简单、小巧,占用面积小,有效地节约空间。
本发明中,模具为塑料或由玻璃和塑料制成的多层结构时,塑料选用聚四氟乙烯,聚四氟乙烯(Teflon或PTFE),俗称“塑料王”,是由四氟乙烯经聚合而成的高分子化合物,具有优良的化学稳定性、耐腐蚀性、密封性、高润滑不粘性、电绝缘性和良好的抗老化耐力。用作工程塑料,可制成聚四氟乙烯管、棒、带、板、薄膜等。一般应用于性能要求较高的耐腐蚀的管道、容器、泵、阀以及制雷达、高频通讯器材、无线电器材等。
射频是一种高频交流变化电磁波的简称,频率范围从300KHz~30GHz之间。其中,微波频段(300MHz-300GHz)又是射频的较高频段。传统的射频加热,主要利用高频段微波对物体作用从而达到加热的目的,具有加热速度快,受热均匀的特点。这种加热方式主要用于食物的加热灯,例如家用的微波炉。
聚合物材料发泡成型过程中,先将聚合物材料放入模具内,然后开启射频电源7,在射频电极A4和所述射频电极B5之间产生高频交变电场,模具内高分子材料中具有极性的分子将发生高频振动,摩擦生热,从而加热聚合物材料(对聚合物材料这种加热方式类似于微波炉加热食物)。当温度高于发泡剂分解温度时,发泡剂迅速分解、膨胀,促使聚合物材料发泡,实现对聚合物材料均匀且快速加热,所以可以减少所需的发泡时间。因此,本发明的聚合物发泡成型装置具有广阔的应用前景,尤其是在运动鞋发泡中底的制造领域,具有重要的应用价值。
本发明的聚合物发泡成型装置可广泛用于PU、TPU、EVA,PE,PP,SEBS(SEBS热塑性弹性体)以及其它弹性体材料或共混材料的发泡。即使对于不吸收射频或者极性弱的聚合物材料,也可以通过共混高极性的高分子材料或无机材料来充当射频吸收剂,从而实现射频加热。
SEBS是饱和型SBS,或称氢化SBS,是由特种线型SBS加氢使双键饱和而制得,SBS在催化剂存在下适度定向加氢,则使聚丁二烯链段氢化成聚乙烯(E)和聚丁烯(B)链鼓,故称为SEBS。同样,SIS氢化后使其中的聚异戊二烯转变为聚乙瞻(E)和聚丙烯链段,则得饱和型SIS(SEPS)。
以EVA为例说明本发明技术方案的使用方法,EVA为弱极性材料,共混少量聚乙二醇混合作为吸波材料,聚乙二醇为强极性材料,发泡步骤如下:
第一步,将100份EVA,2份AC发泡剂、1份助发泡剂、0.3份交联剂,0.5份抗氧剂、10份填料,1份聚乙二醇等进行共混均匀,得到待发泡母材;
第二步,将第一步得到的待发泡母材放置于模具内,并在模具上下施加压力将模具压紧(采用本领域内常规夹紧装置对模具进行夹紧,实现模具的合模);
第三步,开启射频电源7,在射频电极A4和所述射频电极B5间产生高频振荡电场,并产生射频,在高频振荡电场下,模具材料内部聚乙二醇极性分子会不停地随之转换方向,随着极性分子或官能团的不断转向,彼此发生碰撞,相互摩擦进而产生热量,进而使模腔3内的EVA共混材料温度升高,当温度高于AC发泡剂分解温度时,AC发泡剂迅速分解、膨胀,促使EVA发泡,并得到与模腔3形状相同的发泡聚合物材料。
上述实施例和图式并非限定本发明的产品形态和式样,任何所属技术领域的普通技术人员对其所做的适当变化或修饰,皆应视为不脱离本发明的专利范畴。
Claims (5)
1.一种聚合物发泡成型装置,包括模具,其特征在于:所述模具包括上模和下模,所述上模和所述下模合模构成密闭的模腔,所述上模的外表面与所述下模的外表面上分别设置有射频电极A和射频电极B,还包括有射频电源,所述射频电极A和所述射频电极B经电缆分别与所述射频电源的正极和负极连接。
2.根据权利要求1所述的一种聚合物发泡成型装置,其特征在于:所述射频电极A和所述射频电极B位于所述上模的外表面与所述下模的外表面上成相对设置。
3.根据权利要求1所述的一种聚合物发泡成型装置,其特征在于:所述电缆为具有屏蔽电池波功能的电缆。
4.根据权利要求1所述的一种聚合物发泡成型装置,其特征在于:所述上模和所述下模均为玻璃或塑料。
5.根据权利要求1所述的一种聚合物发泡成型装置,其特征在于:所述上模和所述下模均具有多层结构,所述上模由多层玻璃和多层塑料粘合制成,所述下模由多层玻璃和多层塑料粘合制成。
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JPH06315995A (ja) * | 1993-03-08 | 1994-11-15 | Teijin Ltd | 複合成形品の製造方法 |
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EP1053849A2 (de) * | 1999-05-11 | 2000-11-22 | Möller Plast GmbH | Verfahren und Vorrichtung zum Herstellen eines Kunststoffteils |
US20110206926A1 (en) * | 2010-02-22 | 2011-08-25 | Michel Marc | Composite Foam Product |
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