CN114703700B - 一种高克重云母纸的均匀抄造方法 - Google Patents
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Abstract
本发明公开了一种高克重云母纸的均匀抄造方法,该方法将云母原料处理后配制成粗云母浆料以及细云母浆料;将细云母浆料制得面纸;将粗云母浆料通过抄造工艺得到有矩形波剖面的芯纸;然后对部分面纸按照所述矩形波的剖面尺寸进行裁切,并沿芯纸的长度方向贴装于芯纸一侧的矩形波位置;在芯纸另一侧的矩形波位置中沿芯纸的长度方向喷导热颗粒物以及增强纤维;再在芯纸的两侧表面施胶,并将多层芯纸进行顺序叠放得到复合芯纸,在复合芯纸两侧表面覆面纸,在热压辊的热压作用下复合形成型并固化,固化完成后切边即得成品高克重云母纸。本发明可用于制备高克重云母纸,其制得的云母纸兼具物理强度和绝缘性能,并在平面内具有较佳的内部均匀性。
Description
技术领域
本发明涉及绝缘材料中的云母纸制备技术领域,具体涉及一种高克重云母纸的均匀抄造方法。
背景技术
云母是一类含水铝硅酸盐类的总称。其具有电气强度高,介质损耗低,表面电阻和体积电阻高的优点,具有高绝缘、抗电晕、耐酸碱、抗辐射、化学稳定性、富有弹性、高剥离性、耐剪切力和抗张强度大等优异性能。
作为云母的一类最广泛应用,云母纸通常由母矿物经过水力破碎制成云母料浆,在经过云母造纸机抄造而成的材料,其不仅保持了天然云母的优良性能,且厚度均匀、介电强度波动范围小、电晕起始电压高而稳定;其介质损耗的电压特性比片云母绝缘稳定得多,导热性良好,使用时温升低,而且云母纸已具备与片云母制品相对应的全部品种,在许多领域已取代天然片云母,广泛应用于电缆、大型机电设备中,且目前在大电机上几乎全部采用云母纸作主绝缘体。
目前,云母纸的种类,规格、品种、类别较多,与其他纸类产品类似,其通常也会以克重作为标记单位来进行区别,一般来说,云母纸纸张的克重越小,纸张越薄,其中,低克重云母纸的性能稳定性更好,而高克重的云母纸张则由于厚度优势,具有较高的物理强度和更优异的绝缘性。
考虑到圆网抄纸机中的抄纸板在纸浆中不能较好的模仿抄纸工人的抄纸动作,导致抄纸时纸浆分布不均匀,这样会使得直接在圆网抄纸机上获得的高克重云母纸(>200g/m2)在后期成型过程中容易形成内部缺陷,导致在实际使用过程中容易出现绝缘缺陷而导致击穿现象,导致相关设备运行受阻,影响相关设备正常运行,甚至造成设备损坏;基于上述原因,现有技术中生产高克重云母纸时都是先生产低克重云母纸,然后将低克重云母纸施胶后进行叠放,然后再热压成型,这种方式会牺牲云母纸的部分电学性能、散热性能,且容易在使用过程中因为热聚集而出现层间剥离,使得其难于满足高绝缘条件的工艺性要求。
发明内容
本发明所解决的技术问题在于提供一种高克重云母纸的均匀抄造方法,以解决上述技术背景中的缺陷。
本发明所解决的技术问题采用以下技术方案来实现:
一种高克重云母纸的均匀抄造方法,具体包括以下操作步骤:
S1将云母原料进行清理后利用水力破碎机进行破碎,得到不同粒径的云母鳞片,将云母鳞片筛分出-60目~+80目以及-160目~+200目两部分,将两部分云母鳞片分别加骨胶溶液配制成粗云母浆料以及细云母浆料;
S2将细云母浆料利用圆网造纸机抄造,得到具有平整表面的面纸,备用;
S3将粗云母浆料在圆网造纸机抄造成芯纸,其抄造过程利用具有矩形波剖面的抄造网面进行抄造成型,得到具有矩形波剖面的芯纸;
所述芯纸的矩形波剖面对应的深度为200~300μm、宽度为15~25mm;
S4对部分面纸按照所述矩形波的剖面尺寸进行裁切,并沿芯纸的长度方向贴装于芯纸一侧的矩形波位置;在芯纸另一侧的矩形波位置中沿芯纸的长度方向喷导热颗粒物以及增强纤维;
S5在芯纸的两侧表面施胶,并将多层芯纸进行顺序叠放得到复合芯纸,在复合芯纸两侧表面覆面纸,在热压辊的热压作用下复合形成型并固化,固化完成后切边即得成品高克重云母纸。
作为进一步限定,配制粗云母浆料时加入的骨胶粘度为12~15°E;
配制细云母浆料时加入的骨胶粘度为8~10°E;
配置粗云母浆料以及细云母浆料时加入的骨胶溶液中,骨胶溶液的加入质量比为15~25%,骨胶的添加量为云母鳞片质量的0.8~1.5%。
作为进一步限定,所述骨胶溶液在配制过程中利用100~160目筛筛除不溶杂质以及未溶解的骨胶胶料。
作为进一步限定,所述骨胶溶液在配制过程中利用GPES型聚醚型消泡剂进行消泡,其消泡剂的量为抄造浆池内云母原浆总质量的0.01%~0.03%。
作为进一步限定,所述面纸单张厚度为80~120μm。
作为进一步限定,所述芯纸的单张厚度为200~300μm。
作为进一步限定,在步骤S4中对矩形波区域喷导热颗粒物以及增强纤维的质量比为5:1~8:1。
作为进一步限定,所述导热颗粒物为六方氮化硼(HBN)、纳米Al2O3与石墨烯的混合物,且混合物中六方氮化硼(HBN)的质量比含量不少于17%。
作为进一步限定,所述增强纤维为经过偶联剂浸泡改性的芳香族聚噁二唑纤维(POD纤维),该改性聚噁二唑纤维的单丝直径为0.3~0.5dtex、单丝长度为0.5~2mm。
作为进一步限定,在步骤S5中进行复合热压成型时采用的热压温度为120~150℃,热压压力为15~20MPa,热压处理时长为30~45min。
作为进一步限定,芯纸的两侧表面施胶的胶层厚度为60~90μm,且胶层中采用的胶料包括:
脂肪酸量在60%~70%的长油度醇酸树脂75~80wt%、粘度为6~8°E的聚甲基乙烯基硅氧烷7~9wt%、二甘醇二苯甲酸酯3~5wt%、三羟甲基丙烷三辛酸酯1~3wt%以及余量的增强填充物;所述增强填充物为间位芳纶沉析纤维、白炭黑、纳米Al2O3的组合。
有益效果:本发明的高克重云母纸的均匀抄造方法利用具有矩形波剖面的粗粒径云母纸作为芯纸,其在芯纸分别进行处理,其一侧的矩形波槽内通过裁切后的面纸进行面填充、而另一侧的矩形波槽内通过导热颗粒物以及增强纤维进行填充,然后利用循环叠放的芯纸叠合出一定厚度,在利用制得细粒径云母纸作为面纸进行外侧面封闭后热压至一定厚度而成,这种方式可用以成型高克重的云母纸,且其用于成型克重范围在200~400g/m2的高克重云母纸时具有较佳的结构稳定性,在相同的厚度条件下,用本发明的方法制得的云母纸兼具物理强度和绝缘性能,并在平面内具有较佳的内部均匀性、结构稳定性也要更好,能有效减少湿法抄造方式直接成型高克重后云母纸所导致的形成内部缺陷,同时绝缘性能更好,制备的云母纸能在连续使用状态下保持尺寸持续稳定以及较佳的绝缘性,是发电机、电动机等电器设备的理想基础材料。
附图说明
图1为本发明的方法抄造的高克重云母纸的剖面细节图。
其中:1、第一面纸;2、胶层;3、芯纸;4、下填充部;5、第二面纸;6、上填充部。
具体实施方式
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解,下面结合具体图示,进一步阐述本发明。
本发明的高克重云母纸的均匀抄造方法的实施例中,通过该方法抄造出来的高克重云母纸具有如图1所示的剖面放大结构,其中,包括作为两侧表面封闭的第一面纸1以及第二面纸5,而在第一面纸1与第二面纸5之间叠放有四层芯纸单元,其每层芯纸单元结构一致,均包括芯纸3,该芯纸3通过具有矩形波剖面的抄造网面抄造成型,芯纸3的纸面上具有交错设置的矩形波空间,其朝下的矩形波空间为下填充部4,其内成型有导热颗粒物以及增强纤维,而朝上的矩形波空间为上填充部6,该上填充部6中成型有预裁切好的面纸。
具有上述结构特征的高克重云母纸通过以下方式制备:
在实施例一中,高克重云母纸在制备时先将云母原料进行清理后除杂,并在除杂完成后利用水力破碎机进行破碎处理,得到不同粒径的云母鳞片,从不同粒径的云母鳞片中筛分出-60目~+80目的粗云母鳞片以及-160目~+200目的细云母鳞片,备用。
配制骨胶溶液:将骨胶胶料和水投入不锈钢容器中,采用130℃的蒸汽通入不锈钢容器中的溶液进行加热,并不断搅拌,使骨胶溶解于水中,然后利用100目筛筛除不溶杂质以及未溶解的骨胶胶料,得骨胶溶液。骨胶溶液配制两组,其中一组骨胶溶液采用粘度为14°E的骨胶胶料,得到第一骨胶溶液,而另一组骨胶溶液采用粘度为9°E的骨胶胶料,得到第二骨胶溶液。
利用粗云母鳞片以及第一骨胶溶液配置粗云母浆料,利用细云母鳞片以及第二骨胶溶液配置粗云母浆料,两种云母浆料的配制方式相同:
先将对应的云母鳞片加水混合打浆,然后将骨胶溶液、消泡剂(消泡剂采用GPES型聚醚型消泡剂,且消泡剂的量为抄造浆池内云母原浆总质量的0.02%)加入装有云母原浆的抄造浆池内进行调制并搅拌混合均匀,保证混合后骨胶溶液在浆料中的质量比15%,且骨胶的添加量为云母鳞片质量的1.2%,配制成粗云母浆料以及细云母浆料。
将粗云母浆料利用圆网造纸机抄造,得到具有平整表面、且单张厚度为100μm的面纸,备用。
将粗云母浆料在圆网造纸机抄造成芯纸,其抄造过程利用具有矩形波剖面的抄造网面进行抄造成型,得到芯纸,该芯纸的剖面形状如图所示,具有矩形波剖面,且单张芯纸的单张厚度为200μm;而芯纸的矩形波剖面对应的深度为200μm、宽度为15mm。
对部分面纸按照矩形波的剖面尺寸进行裁切,并沿芯纸的长度方向贴装于芯纸3上对应上填充部6的矩形波位置;在芯纸3另一侧的下填充部4对应矩形波位置中沿芯纸的长度方向喷导热颗粒物与增强纤维的混合物。其中,导热颗粒物中含有30wt%的六方氮化硼(HBN)、45wt%的纳米Al2O3以及25wt%的石墨烯,而增强纤维为经过偶联剂浸泡改性的芳香族聚噁二唑纤维(POD纤维)且该改性聚噁二唑纤维的单丝直径为0.3~0.5dtex、单丝长度为0.5~2mm;导热颗粒物以及增强纤维的混合质量为5:1;且在喷成型时充满下填充部4。
将芯纸3处理完成后,在芯纸3的两侧表面施胶,控制施胶的胶层2的厚度为60μm,以使得对应的胶层2在受压成型后的胶层能控制在35~40μm的状态,而胶层2中采用的胶料包括:
脂肪酸量在60%~70%的长油度醇酸树脂75wt%、粘度为6°E的聚甲基乙烯基硅氧烷7wt%、二甘醇二苯甲酸酯3wt%、三羟甲基丙烷三辛酸酯1wt%以及14wt%的芳纶沉析纤维作为增强填充物。
将四层按照上述方式处理好的芯纸3进行顺序叠放得到复合芯纸,在复合芯纸两侧表面覆面纸得到对应的第一面纸1以及第二面纸5,在热压辊的热压作用下复合形成型并固化,热固化处理时控制热压温度为120℃,热压压力为15MPa,热压处理45min,固化完成后降温后然后卸至半成品室降温平衡处理,使云母纸的含水量保持在4~7%切边整饰,最终得到成品高克重云母纸。
利用该方法制得的高克重云母纸的克重为260g/m2、厚度为1.14mm;其介电强度值为17.6~19.2KV/mm,平均介电强度为18.9KV/mm;抗张力范围为7.9~8.6N/cm,平均抗张力为8.3N/cm;其导热率为1.24~1.33W/m*K,平均导热率为1.29W/m*K;其兼备较佳的厚度、物理强度以及介电强度性能。
在实施例二中,
在实施例二中,高克重云母纸在制备时先将云母原料进行清理后除杂,并在除杂完成后利用水力破碎机进行破碎处理,得到不同粒径的云母鳞片,从不同粒径的云母鳞片中筛分出-60目~+80目的粗云母鳞片以及-160目~+200目的细云母鳞片,备用。
配制骨胶溶液:将骨胶胶料和水投入不锈钢容器中,采用120℃的蒸汽通入不锈钢容器中的溶液进行加热,并不断搅拌,使骨胶溶解于水中,然后利用150目筛筛除不溶杂质以及未溶解的骨胶胶料,得骨胶溶液。骨胶溶液配制两组,其中一组骨胶溶液采用粘度为13.5°E的骨胶胶料,得到第一骨胶溶液,而另一组骨胶溶液采用粘度为9.5°E的骨胶胶料,得到第二骨胶溶液。
利用粗云母鳞片以及第一骨胶溶液配置粗云母浆料,利用细云母鳞片以及第二骨胶溶液配置粗云母浆料,两种云母浆料的配制方式相同:
先将对应的云母鳞片加水混合打浆,然后将骨胶溶液、消泡剂(消泡剂采用GPES型聚醚型消泡剂,且消泡剂的量为抄造浆池内云母原浆总质量的0.03%)加入装有云母原浆的抄造浆池内进行调制并搅拌混合均匀,保证混合后骨胶溶液在浆料中的质量比20%,且骨胶的添加量为云母鳞片质量的1%,配制成粗云母浆料以及细云母浆料。
将粗云母浆料利用圆网造纸机抄造,得到具有平整表面、且单张厚度为100μm的面纸,备用。
将粗云母浆料在圆网造纸机抄造成芯纸,其抄造过程利用具有矩形波剖面的抄造网面进行抄造成型,得到芯纸,该芯纸的剖面形状如图所示,具有矩形波剖面,且单张芯纸的单张厚度为300μm;而芯纸的矩形波剖面对应的深度为350μm、宽度为20mm。
对部分面纸按照矩形波的剖面尺寸进行裁切,并沿芯纸的长度方向贴装于芯纸3上对应上填充部6的矩形波位置;在芯纸3另一侧的下填充部4对应矩形波位置中沿芯纸的长度方向喷导热颗粒物与增强纤维的混合物。其中,导热颗粒物中含有18wt%的六方氮化硼(HBN)、60wt%的纳米Al2O3以及22wt%的石墨烯,而增强纤维为经过偶联剂浸泡改性的芳香族聚噁二唑纤维(POD纤维)且该改性聚噁二唑纤维的单丝直径为0.3~0.5dtex、单丝长度为0.5~2mm;导热颗粒物以及增强纤维的混合质量为6:1;且在喷成型时充满下填充部4。
将芯纸3处理完成后,在芯纸3的两侧表面施胶,控制施胶的胶层2的厚度为70μm,而胶层2中采用的胶料包括:
脂肪酸量在60%~70%的长油度醇酸树脂80wt%、粘度为6°E的聚甲基乙烯基硅氧烷8wt%、二甘醇二苯甲酸酯4wt%、三羟甲基丙烷三辛酸酯2wt%以及6wt%的芳纶沉析纤维作为增强填充物。
将四层按照上述方式处理好的芯纸3进行顺序叠放得到复合芯纸,在复合芯纸两侧表面覆面纸得到对应的第一面纸1以及第二面纸5,在热压辊的热压作用下复合形成型并固化,热固化处理时控制热压温度为150℃,热压压力为20MPa,热压处理40min,固化完成后降温后然后卸至半成品室降温平衡处理,使云母纸的含水量保持在4~7%,切边整饰后得到成品高克重云母纸。
利用该方法制得的高克重云母纸的克重为310g/m2、厚度为1.51mm;其介电强度值为18.1~18.9KV/mm,平均介电强度为18.6KV/mm;抗张力范围为8.6~9.1N/cm,平均抗张力为8.9N/cm;其导热率为1.19~1.26W/m*K,平均导热率为1.24W/m*K;其兼备较佳的厚度、物理强度以及介电强度性能。
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解,本发明不受上述实施例的限制,上述实施例和说明书中描述的只是说明本发明的原理,在不脱离本发明精神和范围的前提下,本发明还会有各种变化和改进,这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等效物界定。
Claims (6)
1.一种高克重云母纸的均匀抄造方法,其特征在于,用于成型克重范围在200~400g/m2的高克重云母纸,方法具体包括以下操作步骤:
S1将云母原料进行清理后利用水力破碎机进行破碎,得到不同粒径的云母鳞片,将云母鳞片筛分出-60目~+80目以及-160目~+200目两部分,将两部分云母鳞片分别加骨胶溶液配制成粗云母浆料以及细云母浆料;
其中,配制粗云母浆料时加入的骨胶粘度为12~15°E;
配制细云母浆料时加入的骨胶粘度为8~10°E;
配置粗云母浆料以及细云母浆料时加入的骨胶溶液中,骨胶溶液的加入质量比为15~25%,骨胶的添加量为云母鳞片质量的0.8~1.5%;
S2将细云母浆料利用圆网造纸机抄造,得到具有平整表面的面纸,备用;
S3将粗云母浆料在圆网造纸机抄造成芯纸,其抄造过程利用具有矩形波剖面的抄造网面进行抄造成型,得到具有矩形波剖面的芯纸;
所述芯纸的单张厚度为200~300μm、芯纸上矩形波剖面对应的深度为200~300μm、宽度为15~25mm;
S4对部分面纸按照所述矩形波的剖面尺寸进行裁切,并沿芯纸的长度方向贴装于芯纸一侧的矩形波位置;在芯纸另一侧的矩形波位置中沿芯纸的长度方向喷导热颗粒物以及增强纤维;
所述导热颗粒物为六方氮化硼、纳米Al2O3与石墨烯的混合物,且混合物中六方氮化硼的质量含量不少于17%;
所述增强纤维为经过偶联剂浸泡改性的芳香族聚噁二唑纤维,该改性聚噁二唑纤维的单丝直径为0.3~0.5dtex、单丝长度为0.5~2mm;
步骤中对矩形波区域喷导热颗粒物以及增强纤维的质量比为5:1~8:1,且在喷成型时充满整个矩形波区域;
S5在芯纸的两侧表面施胶,并将多层芯纸进行顺序叠放得到复合芯纸,在复合芯纸两侧表面覆面纸,在热压辊的热压作用下复合形成型并固化,固化完成后切边即得成品高克重云母纸。
2.根据权利要求1所述的高克重云母纸的均匀抄造方法,其特征在于,所述骨胶溶液在配制过程中利用100~160目筛筛除不溶杂质以及未溶解的骨胶胶料。
3.根据权利要求1所述的高克重云母纸的均匀抄造方法,其特征在于,所述骨胶溶液在配制过程中利用GPES型聚醚型消泡剂进行消泡,其消泡剂的量为抄造浆池内云母原浆总质量的0.01%~0.03%。
4.根据权利要求1所述的高克重云母纸的均匀抄造方法,其特征在于,所述面纸单张厚度为80~120μm。
5.根据权利要求1所述的高克重云母纸的均匀抄造方法,其特征在于,在步骤S5中进行复合热压成型时采用的热压温度为120~150℃,热压压力为15~20MPa,热压处理时长为30~45min。
6.根据权利要求1所述的高克重云母纸的均匀抄造方法,其特征在于,芯纸的两侧表面施胶的胶层厚度为60~90μm,且胶层中采用的胶料包括:
脂肪酸量在60%~70%的长油度醇酸树脂75~80wt%、粘度为6~8°E的聚甲基乙烯基硅氧烷7~9wt%、二甘醇二苯甲酸酯3~5wt%、三羟甲基丙烷三辛酸酯1~3wt%以及余量的增强填充物;所述增强填充物为间位芳纶沉析纤维、白炭黑、纳米Al2O3的组合。
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CN111501401B (zh) * | 2020-04-10 | 2022-04-19 | 北京倚天凌云科技股份有限公司 | 一种树脂复合型绝缘云母纸及其制备方法 |
CN111485456B (zh) * | 2020-04-25 | 2022-04-29 | 霸州市卓源云母科技有限公司 | 一种高强度复合云母纸及其制备方法 |
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