CN107756985A - 一种用于印刷电阻的层叠体及其制备方法 - Google Patents
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Abstract
本发明公开一种用于印刷电阻的层叠体及其制备方法，该层叠体由金属箔、粘合剂和绝缘基底组成，所述金属箔为铜镍合金箔，所述粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛构成，所述绝缘基底由纤维增强材料和热固性树脂热压形成，金属箔的与绝缘基底接触的一面沉积有一层FeSe颗粒。本发明还公开了该层叠体的制备方法。
Description
技术领域
一种用于印刷电阻的层叠体及其制备方法。
技术背景
绕线电阻是用康铜丝或锰铜丝绕在绝缘骨架上制成。它有很多优点：耐高温、精度高、功率大。但其调频特性差，这主要是由于其分布电感较大。在低频的精度仪表中被广泛应用。除了绕线电阻，还有一类电阻的应用也很广泛，即印刷电阻。它是采用印刷电路技术来制作电阻。首先将金属箔粘合在绝缘基底上形成层叠体，然后蚀刻掉部分金属箔，形成的金属图案即构成印刷电阻。通常为了使得金属箔能更好的粘合在绝缘基底上，在金属箔和绝缘基底之间会增加一层粘结剂层。按照上述方法制作的印刷电阻能够满足一般的需求，然而当需要应用在一些特殊环境下时，例如放置在汽车的油缸中测量汽油的实际含量，汽油的存在使得金属箔极易从绝缘基底上剥离。因此急需一种方法能够增强用于汽油中时金属箔在绝缘基底上的剥离强度。
发明内容
本发明的目的在于针对现有的印刷电阻应用于汽油中时其金属箔容易从绝缘基底上剥离的问题，提供一种能增强剥离强度的用于印刷电阻的层叠体及其制备方法。
本发明的层叠体由金属箔、粘合剂和绝缘基底组成，其特征在于，所述金属箔为铜镍合金箔，所述粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛构成，所述绝缘基底由纤维增强材料和热固性树脂热压形成，所述纤维增强材料指的是玻璃纤维，所述热固性树脂指的是环氧树脂，金属箔的与绝缘基底接触的一面沉积有一层FeSe颗粒。
上述层叠体的制备方法为：首先将0.025mm的铜镍合金箔浸泡于热碱溶液中以进行化学清洗，去除铜镍合金箔表面的沾污；然后通过脉冲激光溅射方法在铜镍合金箔表面沉积一层FeSe颗粒，所述沉积工艺为：将Fe：Se=1:1.5的Fe粉和Se粉研磨混合后压成13mm的小圆片，作为脉冲激光沉积的靶，铜镍合金箔与靶的距离为40 mm，通入氩气，维持反应腔内压强为10 Pa，采用的激光为355 nm激光，重复频率10 Hz，脉宽10ns，能量密度为2 J/cm2，沉积时间为0.5h；再在沉积的FeSe颗粒上方覆盖一层25 g/㎡的粘合剂，其中粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛组成；将铜镍合金箔的按上述方式处理过的一面朝下，与8层玻璃纤维（网眼：5mm*5mm,4mm*4mm；克重：165 g/㎡）和半固化态的环氧树脂（其中半固化态的环氧树脂占的重量比为40%，总重量指的是玻璃纤维和半固化态环氧树脂的重量）进行层叠。然后在压强为34 bar，温度为170℃的条件下进行压合，保持该条件一个小时后冷却到室温，再释放压力，从而获得约1.6 mm厚的层叠体。
与现有技术相比，本发明所述的层叠体具有以下的优点：通过在铜镍合金箔表面沉积一层FeSe颗粒，有助于提高铜镍合金箔在绝缘基底上的剥离强度，特别是有助于提高当层叠体浸泡在汽油中时的铜镍合金箔在绝缘基底上的剥离强度。
具体实施方式
以下结合具体实施例对本发明的实现进行详细的描述。
实施例
首先将0.025mm的铜镍合金箔浸泡于热碱溶液中以进行化学清洗，去除铜镍合金箔表面的沾污；然后通过脉冲激光溅射方法在铜镍合金箔表面沉积一层FeSe颗粒，所述沉积工艺为：将Fe：Se=1:1.5的Fe粉和Se粉研磨混合后压成13mm的小圆片，作为脉冲激光沉积的靶，铜镍合金箔与靶的距离为40 mm，通入氩气，维持反应腔内压强为10 Pa，采用的激光为355 nm激光，重复频率10 Hz，脉宽10ns，能量密度为2 J/cm2，沉积时间为0.5h；再在沉积的FeSe颗粒上方覆盖一层25 g/㎡的粘合剂，其中粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛组成；将铜镍合金箔的按上述方式处理过的一面朝下，与8层玻璃纤维（网眼：5mm*5mm,4mm*4mm；克重：165 g/㎡）和半固化态的环氧树脂（其中半固化态的环氧树脂占的重量比为40%，总重量指的是玻璃纤维和半固化态环氧树脂的重量）进行层叠。然后在压强为34bar，温度为170℃的条件下进行压合，保持该条件一个小时后冷却到室温，再释放压力，从而获得约1.6 mm厚的层叠体。
为了说明本实施例的技术效果，按照以下步骤制作层叠体作为本实施例的对比例：
首先将0.025mm的铜镍合金箔浸泡于热碱溶液中以进行化学清洗，去除铜镍合金箔表面的沾污；然后在铜镍合金箔表面覆盖一层25 g/㎡的粘合剂，其中粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛组成；将铜镍合金箔的按上述方式处理过的一面朝下，与8层玻璃纤维（网眼：5mm*5mm,4mm*4mm；克重：165 g/㎡）和半固化态的环氧树脂（其中半固化态的环氧树脂的重量比为40%）进行层叠。然后在压强为34 bar，温度为170℃的条件下进行压合，保持该条件一个小时后冷却到室温，再释放压力，从而获得约1.6 mm厚的层叠体。
剥离强度指的是单位宽度的合金箔从层叠体上进行剥离时所需要的最大力。首先测试通过上述实施例和对比例获得的层叠体在空气中的剥离强度，然后测试浸泡在国家汽油产品标准90号汽油中的剥离强度。获得的结果如表1所示。从表格中可以看出，通过对铜镍合金箔的表面沉积一层FeSe颗粒后，铜镍合金箔在空气中的剥离强度得到一定提升，在90号汽油中的剥离强度得到了显著提升。
| 空气中的剥离强度（N/m） | 90号汽油中的剥离强度（N/m） | |
| 实施例的层叠体 | 400 | 400 |
| 对比例的层叠体 | 300 | 0 |
需要声明的是，以上所述的仅是本发明的优选实施方式，本发明不限于以上实施例。可以理解，本领域技术人员在不脱离本发明的基本构思的前提下直接导出或联想到的其他改进和变化，均应认为包含在本发明的保护范围之内。
Claims (4)
1.一种用于印刷电阻的层叠体，该层叠体由金属箔、粘合剂和绝缘基底组成，其特征在于，所述金属箔为铜镍合金箔，所述粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛构成，所述绝缘基底由纤维增强材料和热固性树脂热压形成，所述纤维增强材料指的是玻璃纤维，所述热固性树脂指的是环氧树脂，金属箔的与绝缘基底接触的一面沉积有一层FeSe颗粒。
2.一种如权利要求1所述的用于印刷电阻的层叠体的制备方法，其特征在于包括如下步骤：首先将0.025mm的铜镍合金箔浸泡于热碱溶液中以进行化学清洗，去除铜镍合金箔表面的沾污；然后通过脉冲激光溅射方法在铜镍合金箔表面沉积一层FeSe颗粒；再在沉积的FeSe颗粒上方覆盖一层25 g/㎡的粘合剂，其中粘合剂由丁腈橡胶和具有热稳定性的苯酚甲醛组成；将铜镍合金箔的按上述方式处理过的一面朝下，与8层玻璃纤维和半固化态的环氧树脂进行层叠；然后在压强为34 bar，温度为170℃的条件下进行热压，保持该条件一个小时后冷却到室温，再释放压力，从而获得所述的层叠体。
3.如权利要求2所述的方法，其特征在于，所述沉积工艺为：将Fe：Se=1:1.5的Fe粉和Se粉研磨混合后压成13mm的小圆片，作为脉冲激光沉积的靶，铜镍合金箔与靶的距离为40mm，通入氩气，维持反应腔内压强为10 Pa，采用的激光为355 nm激光，重复频率10 Hz，脉宽10ns，能量密度为2 J/cm2，沉积时间为0.5h。
4.如权利要求2和3所述的方法，其特征在于，所述玻璃纤维的规格为：网眼：5mm*5mm,4mm*4mm，克重：165 g/㎡；所述半固化态的环氧树脂的重量比为40%。
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