CN111976164A - 聚四氟乙烯基金属基板的制备方法及金属基板 - Google Patents
聚四氟乙烯基金属基板的制备方法及金属基板 Download PDFInfo
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Abstract
本发明公开了提出聚四氟乙烯基金属基板的制备方法,包括以下步骤:S1:将悬浮聚四氟乙烯、无机填料和偶联剂混合均匀,其中,以重量计算,悬浮聚四氟乙烯40‑60份、无机填料40‑60份,偶联剂0‑2份,聚四氟乙烯的粒径不超过200μm,分子量为100万‑800万,无机填料的粒径不超过30μm;S2:将所得混合粉料填充到模具中压制成坯料;S3:烧结坯料,烧结温度是370℃‑390℃,烧结时间4‑5天;S4:将烧结产物车削成聚四氟乙烯膜片;S5:将至少一层膜片与金属箔叠加并热压合,制得金属基板。本发明制备方法所制备的金属基板具有优异的综合性能。
Description
技术领域
本发明涉及金属基板的制备领域,特别涉及聚四氟乙烯基金属基板的 制备方法及金属基板。
背景技术
聚四氟乙烯(PTFE)树脂具有优异的介电性能,应用于金属基板有利 于信号完整快速地传输,是制作高频微波金属基板的理想材料。PTFE的介 电系数单一,不能满足不同场合使用,其质地柔软,热膨胀系数(CTE) 较大,因此PTFE通常并不直接用在金属基板上。陶瓷粉料填充PTFE复合 材料具有相对介电常数可调、介质损耗小、耐化学腐蚀性好、降低了CTE 等优点。
发明内容
为了获得综合性能优异的金属基板,以满足商业微波以及射频应用, 根据本发明的一个方面,提出聚四氟乙烯基金属基板的制备方法,包括以 下步骤:
S1:将悬浮聚四氟乙烯、无机填料和偶联剂混合均匀,其中,以重量 计算,悬浮聚四氟乙烯40-60份、无机填料40-60份,偶联剂0-2份,聚四 氟乙烯的粒径不超过200μm,分子量为100万-800万,无机填料的粒径不 超过30μm;
S2:将所得混合粉料填充到模具中压制成坯料;
S3:烧结坯料,烧结温度是370℃-390℃,烧结时间4-5天;
S4:将烧结产物车削成聚四氟乙烯膜片;
S5:在膜片两贴热压贴附金属箔,制得金属基板。
本实施方式的有益效果在于:(1)本实施方式的方法所制得的金属基 板具有优异的综合性能,其介电常数在2.98-3.2,并保持低介电损耗、较高 的剥离强度和较低的热膨胀率;(2)聚四氟乙烯的粒径不超过200μm,无 机填料粒径不超过30μm,该粒径的树脂和填料彼此具有更好的分散性,有 利于混料均匀;(3)聚四氟乙烯的分子量为100万-800万,该分子量范围 的聚四氟乙烯树脂具有更好的成膜性和加工性。
在某些实施方式中,无机填料为二氧化硅、二氧化硅、氧化铁、氧化1 镁、氧化钙、二氧化钛、钛酸钡、钛酸锶、氮化硼和氮化铝中的一种或多 种的混合物。
在某些实施方式中,无机填料为二氧化硅。
在某些实施方式中,在步骤S2中,至少分三次加压,每次使用不同的 压力,并且在加压的之前将前段压力完全释放后再加压。本实施方式能够 使坯料压制得更精密,能够充分将原料中的空气排出,减少介电材料的孔 隙率。
在某些实施方式中,每次施加的压力为5-15MPa,保压时间为 10-30min。本实施方式的制备方法有利于保证压力坯料的紧实度和排出原 料中的空气。
在某些实施方式中,在步骤S3中,坯料置于模具中,二者一起放置在 烧结炉中烧结,且模具竖着放置。可预防烧结时材料变形,烧结时可使各 个角度受热均匀。
在某些实施方式中,车削转速6r/min,聚四氟乙烯膜片的厚度为 0.165mm。
在某些实施方式中,偶联剂为硅烷偶联剂。
根据本公开的另一个方面,提供一种金属基板,采用上述聚四氟乙烯 基金属基板的制备方法制备。
具体实施方式
为了获得综合性能优异的PTFE基金属基板,根据本发明的一个方面, 提出一种聚四氟乙烯基金属基板的制备方法,包括以下步骤:
S1:将悬浮聚四氟乙烯、无机填料和偶联剂混合均匀,其中,以重量 计算,悬浮聚四氟乙烯40-60份、无机填料40-60份,偶联剂0-2份,聚四 氟乙烯的粒径不超过200μm,分子量为100万-800万,无机填料的粒径不 超过30μm;
S2:将所得混合粉料填充到模具中压制成坯料;
S3:烧结坯料,烧结温度是370℃-390℃,烧结时间4-5天;
S4:将烧结产物车削成聚四氟乙烯膜片;
S5:在膜片两贴热压贴附金属箔,制得金属基板。
本实施方式的有益效果在于:(1)聚四氟乙烯的粒径不超过200μm, 无机填料粒径不超过30μm,该粒径的树脂和填料彼此具有更好的分散性; (2)聚四氟乙烯的分子量为100万-800万,该分子量范围的聚四氟乙烯树 脂具有更好的成膜性和加工性。
在某些实施方式中,无机填料为二氧化硅、氧化铝、氧化铁、氧化镁、 氧化钙、二氧化钛、钛酸钡、钛酸锶、氮化硼和氮化铝中的一种或多种的 混合物。
在某些实施方式中,无机填料为二氧化硅。
在某些实施方式中,在步骤S2中,至少分三次加压,每次使用不同的 压力,并且在加压的之前将前段压力完全释放后再加压。本实施方式能够 使坯料压制得更精密,能够充分将原料中的空气排出。
在某些实施方式中,每次施加的压力为5-15MPa,保压时间为 10-30min。本实施方式的制备方法有利于保证压力坯料的紧实度和排出原 料中的空气。
在某些实施方式中,在步骤S3中,坯料置于模具中,二者一起放置在 烧结炉中烧结,且模具竖着放置。可预防烧结时材料变形,烧结时可使各 个角度受热均匀。
在某些实施方式中,车削转速6r/min,聚四氟乙烯膜片的厚度为 0.165mm。
在某些实施方式中,偶联剂为硅烷偶联剂。
根据本公开的另一个方面,提供一种金属基板,采用上述聚四氟乙烯 基金属基板的制备方法制备。
实施例1
将40份悬浮聚四氟乙烯、60份二氧化硅加入到双行星搅拌器中混合均 匀,聚四氟乙烯的粒径不超过200μm,分子量为100万-800万,无机填料 的粒径不超过30μm;将所得混合粉料填满模具型腔,分三次施加压力进 行压制,第一加压压力为5MPa,保压时间10min,第一次加压的压力完全 释放后再第二次加压,第二次加压压力为10MPa,保压时间为15min,第 二次加压的压力完全释放后再第三次加压,第三次加压压力为15MPa,保 压时间为30min。加压结束后,将模具与混合料整体竖直放置在烧结炉中烧 结,烧结温度是370℃-390,烧结5天。烧结完成后自然冷却至室温,开模 取出所得材料快。将烧结所得材料块车削成膜片,其中切削转速6r/min, 聚四氟乙烯膜片的厚度为0.165mm。将膜片裁切成方形,两侧贴附铜箔并 热压合,形成金属基板。采用IPC-TM650标准方法检测其Dk、Df,抗剥离 强度、Z轴热膨胀系数,结果见表1。
实施例2
将50份悬浮聚四氟乙烯、50份二氧化硅、1份偶联剂加入到双行星搅 拌器中混合均匀,聚四氟乙烯的粒径不超过200μm,分子量为100万-800 万,无机填料的粒径不超过30μm;将所得混合粉料填满模具型腔,分三次 施加压力进行压制,第一次加压压力为10MPa,保压时间10min,第一次 加压的压力完全释放后再第二次加压,第二次加压压力为10MPa,保压时 间为10min,第二次加压的压力完全释放后再第三次加压,第三次加压压力 为15MPa,保压时间为30min。加压结束后,将模具与混合料整体竖直放 置在烧结炉中烧结,烧结温度是370℃-390,烧结4天。烧结完成后自然冷 却至室温,开模取出所得材料快。将烧结所得材料块车削成膜片,其中切 削转速6r/min,聚四氟乙烯膜片的厚度为0.165mm。将膜片裁切成方形, 两侧贴附铜箔并热压合,形成金属基板。采用IPC-TM650标准方法检测其 Dk、Df,抗剥离强度、Z轴热膨胀系数,结果见表1。
实施例3
将60份悬浮聚四氟乙烯、40份二氧化硅、2份偶联剂加入到双行星搅 拌器中混合均匀,聚四氟乙烯的粒径不超过200μm,分子量为100万-800 万,无机填料的粒径不超过30μm;将所得混合粉料填满模具型腔,分三次 施加压力进行压制,第一加压压力为15MPa,保压时间10min,第一次加 压的压力完全释放后再第二次加压,第二次加压压力为15MPa,保压时间 为15min,第二次加压的压力完全释放后再第三次加压,第三次加压压力为 15MPa,保压时间为30min。加压结束后,将模具与混合料整体竖直放置在 烧结炉中烧结,烧结温度是370℃-390,烧结5天。烧结完成后自然冷却至 室温,开模取出所得材料快。将烧结所得材料块车削成膜片,其中切削转 速6r/min,聚四氟乙烯膜片的厚度为0.165mm。将膜片裁切成方形,两侧 贴附铜箔并热压合,形成金属基板。采用IPC-TM650标准方法检测其Dk、 Df,抗剥离强度、Z轴热膨胀系数,结果见表1。
对比实施例1
将30份悬浮聚四氟乙烯、70份二氧化硅、1份偶联剂加入到双行星搅 拌器中混合均匀;将所得混合粉料填满模具型腔施加压力为15MPa,保压 时间为30min。加压结束后,将模具与混合料整体竖直放置在烧结炉中烧结, 烧结温度是370℃-390,烧结5天。烧结完成后自然冷却至室温,开模取出 所得材料快。将烧结所得材料块车削成膜片,其中切削转速6r/min,聚四 氟乙烯膜片的厚度为0.165mm。将膜片裁切成方形,两侧贴附铜箔并热压 合,形成金属基板。采用IPC-TM650标准方法检测其Dk、Df,抗剥离强度、 Z轴热膨胀系数,结果见表1。
对比实施例2
将70份悬浮聚四氟乙烯、30份二氧化硅、2份偶联剂加入到双行星搅 拌器中混合均匀;将所得混合粉料填满模具型腔,施加压力为15MPa,保 压时间为30min。加压结束后,将模具与混合料整体竖直放置在烧结炉中烧 结,烧结温度是370℃-390,烧结5天。烧结完成后自然冷却至室温,开模 取出所得材料快。将烧结所得材料块车削成膜片,其中切削转速6r/min, 聚四氟乙烯膜片的厚度为0.165mm。将膜片裁切成方形,两侧贴附铜箔并 热压合,形成金属基板。采用IPC-TM650标准方法检测其Dk、Df,抗剥离 强度、Z轴热膨胀系数,结果见表1。
表1实施例1-3及对比实施例1-2的性能测试结果
以上所述的仅是本发明的一些实施方式。对于本领域的普通技术人员 来说,在不脱离本发明创造构思的前提下,还可以做出若干变形和改进, 这些都属于本发明的保护范围。
Claims (9)
1.聚四氟乙烯基金属基板的制备方法,其特征在于,包括以下步骤:
S1:将悬浮聚四氟乙烯、无机填料和偶联剂混合均匀,其中以重量计算,悬浮聚四氟乙烯40-60份、无机填料40-60份,偶联剂0-2份,聚四氟乙烯的粒径不超过200μm,分子量为100万-800万,无机填料的粒径不超过30μm;
S2:将所得混合粉料填充到模具中压制成坯料;
S3:烧结坯料,烧结温度是370℃-390℃,烧结时间4-5天;
S4:将烧结产物车削成聚四氟乙烯膜片;
S5:在膜片两贴热压贴附金属箔,制得金属基板。
2.根权利要求1所述的聚四氟乙烯基金属基板的制备方法,其特征在于,无机填料为二氧化硅、氧化铝、氧化铁、氧化镁、氧化钙、二氧化钛、钛酸钡、钛酸锶、氮化硼和氮化铝中的一种或多种的混合物。
3.根据权利要求1所述的聚四氟乙烯基金属基板的制备方法,其特征在于,所述无机填料为二氧化硅。
4.根据权利要求1所述的聚四氟乙烯基金属基板的制备方法,其特征在于,在所述步骤S2中,至少分三次加压,每次使用不同的压力,并且在加压的之前将前段压力完全释放后再加压。
5.根据权利要求4所述的聚四氟乙烯基金属基板的制备方法,其特征在于,每次施加的压力为5-15MPa,保压时间为10-30min。
6.根据权利要求1所述的聚四氟乙烯基金属基板的制备方法,其特征在于,在步骤S3中,所述坯料置于所述模具中,二者一起放置在烧结炉中烧结,且所述模具竖着放置。
7.根据权利要求1所述的聚四氟乙烯基金属基板的制备方法,其特征在于,车削转速6r/min,聚四氟乙烯膜片的厚度为0.165mm。
8.根据权利要求1所述的聚四氟乙烯基金属基板的制备方法,其特征在于,所述偶联剂为硅烷偶联剂。
9.一种金属基板,其特征在于,采用权利要求1-8任一项所述的聚四氟乙烯基金属基板的制备方法制备。
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