CN112309703B - 一种纳米晶磁芯的固化方法 - Google Patents

一种纳米晶磁芯的固化方法 Download PDF

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CN112309703B
CN112309703B CN202011206594.3A CN202011206594A CN112309703B CN 112309703 B CN112309703 B CN 112309703B CN 202011206594 A CN202011206594 A CN 202011206594A CN 112309703 B CN112309703 B CN 112309703B
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邓毕力
王玉川
罗顶飞
潘振海
晋立从
冯英杰
徐敏义
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Fuyang Normal University
Anhui Zhimagnetic New Material Technology Co Ltd
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Abstract

本发明公开了一种纳米晶磁芯的固化方法，属于磁芯材料制备技术领域。该方法步骤如下：首先，将40～60份聚氨酯改性环氧树脂、15～30份双酚A环氧丙烯酸酯、8～15份二丙二醇二丙烯酸酯、2～4份1‑羟基环己基苯基甲酮、0.2～1份消泡剂、0.3～1.5份润湿剂、0.5～1.5份流平剂进行混合并搅拌至均匀，形成胶液；然后，将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为30～60s；最后，将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25～30℃，固化时间为5～15s。本发明方法操作简单，成本低，可以大大降低固化后磁芯所受的应力，使固化后的磁芯保持较好的性能。

Description

一种纳米晶磁芯的固化方法
技术领域
本发明涉及一种纳米晶磁芯的固化方法，属于磁芯材料制备技术领域。
背景技术
纳米晶磁芯一般是由纳米晶合金带材绕制后热处理制得，常用于制作磁头、变压器、扼流线圈、高效电机、电抗器等。纳米晶合金带材在热处理时由于结构驰豫等原因开始脆化，韧性较差，当受到外力时，磁芯易碎，并且软磁性能随之下降，严重影响磁芯的后续应用。为了解决磁芯韧性差易碎问题，一般是先将热处理后的纳米晶磁芯浸胶固化然后再装入相应形状的保护盒内。传统的磁芯浸胶固化是以环氧树脂胶液作为磁芯的粘结剂在高温(大于100℃)下进行长时间烘烤固化，现有环氧树脂胶液固化后的收缩应力较大，容易使磁芯受力造成磁芯性能降低。
发明内容
针对现有技术中的问题，本发明提供一种纳米晶磁芯的固化方法，该方法通过设计胶液的配方并改善固化方法，可以大大降低固化后磁芯所受的内应力，使固化后的磁芯保持较好的性能。
为实现以上技术目的，本发明的技术方案是：
一种纳米晶磁芯的固化方法，包括以下步骤：
(1)将40～60份聚氨酯改性环氧树脂、15～30份双酚A环氧丙烯酸酯、8～15份二丙二醇二丙烯酸酯、2～4份1-羟基环己基苯基甲酮、0.2～1份消泡剂、0.3～1.5份润湿剂、0.5～1.5份流平剂进行混合并搅拌至均匀，形成胶液；以上份数以重量份数计；
(2)将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为30～60s；
(3)将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25～30℃，固化时间为5～15s。
优选地，步骤(1)中的胶液由以下质量份的成分组成：
聚氨酯改性环氧树脂50份
双酚A环氧丙烯酸酯25份
二丙二醇二丙烯酸酯12份
1-羟基环己基苯基甲酮3份
消泡剂0.6份
润湿剂1.2份
流平剂1.2份
优选地，步骤(1)所述的聚氨酯改性环氧树脂的制备步骤为：将10份聚酯多元醇加热至90℃回流脱水，降温，加入4份二苯基甲烷二异氰酸酯于55℃反应1h，冷却至室温，加入2份1,4-丁二醇和0.1份三羟甲基丙烷搅拌均匀得聚氨酯预聚体，再将120份双酚A环氧树脂加入到聚氨酯预聚体中反应1h，得聚氨酯改性环氧树脂；以上份数以重量份数计。
优选地，所述消泡剂采用Defom5300，润湿剂采用TEGO Wet KL 245，流平剂采用BYK-320。
从以上描述可以看出，本发明具备以下优点：
(1)本发明方法通过设计胶液的配方并改善固化方法，可以大大降低固化后磁芯所受的内应力，使固化后的磁芯保持较好的性能。
(2)本发明方法操作简单，可以在室温极短时间内完成磁芯的固化，节能又高效。
(3)本发明胶液中的聚氨酯改性环氧树脂结构中既具有环氧基团提供粘结能力，又有聚氨酯链段提供柔韧性，可以对固化后的磁芯起到增韧的效果，克服了磁芯韧性差易碎问题。
具体实施方式
下面结合具体的实施例来进一步说明本发明的特点，但不对本发明的权利要求做任何限定。
实施例1
一种纳米晶磁芯的固化方法，包括以下步骤：
(1)将10份聚酯多元醇加热至90℃回流脱水，降温，加入4份二苯基甲烷二异氰酸酯于55℃反应1h，冷却至室温，加入2份1,4-丁二醇和0.1份三羟甲基丙烷搅拌均匀得聚氨酯预聚体，再将120份双酚A环氧树脂加入到聚氨酯预聚体中反应1h，得聚氨酯改性环氧树脂；
(2)将50份步骤(1)制得的聚氨酯改性环氧树脂、25份双酚A环氧丙烯酸酯、12份二丙二醇二丙烯酸酯、3份1-羟基环己基苯基甲酮、0.6份消泡剂Defom5300、1.2份润湿剂TEGOWet KL 245、1.2份流平剂BYK-320进行混合并搅拌至均匀，形成胶液；以上份数均以重量份数计；
(3)将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为45s；
(4)将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25℃，固化时间为10s。
本实施例步骤(3)中所提及的纳米晶磁芯是按照公开号为CN109754973A的发明专利实施例1中的方法制备得到的经热处理后的铁芯，磁芯型号规格为15/21*10(内径15mm，外径21mm，高度10mm)。
实施例2
(1)将10份聚酯多元醇加热至90℃回流脱水，降温，加入4份二苯基甲烷二异氰酸酯于55℃反应1h，冷却至室温，加入2份1,4-丁二醇和0.1份三羟甲基丙烷搅拌均匀得聚氨酯预聚体，再将120份双酚A环氧树脂加入到聚氨酯预聚体中反应1h，得聚氨酯改性环氧树脂；
(2)将60份步骤(1)制得的聚氨酯改性环氧树脂、18份双酚A环氧丙烯酸酯、9份二丙二醇二丙烯酸酯、2份1-羟基环己基苯基甲酮、1份消泡剂Defom5300、1.5份润湿剂TEGOWet KL 245、1.5份流平剂BYK-320进行混合并搅拌至均匀，形成胶液；以上份数均以重量份数计；
(3)将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为45s；
(4)将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25℃，固化时间为10s。
本实施例步骤(3)中所提及的纳米晶磁芯是按照公开号为CN109754973A的发明专利实施例1中的方法制备得到的经热处理后的铁芯，磁芯型号规格为15/21*10(内径15mm，外径21mm，高度10mm)。
实施例3
(1)将10份聚酯多元醇加热至90℃回流脱水，降温，加入4份二苯基甲烷二异氰酸酯于55℃反应1h，冷却至室温，加入2份1,4-丁二醇和0.1份三羟甲基丙烷搅拌均匀得聚氨酯预聚体，再将120份双酚A环氧树脂加入到聚氨酯预聚体中反应1h，得聚氨酯改性环氧树脂；
(2)将43份步骤(1)制得的聚氨酯改性环氧树脂、29份双酚A环氧丙烯酸酯、15份二丙二醇二丙烯酸酯、4份1-羟基环己基苯基甲酮、0.4份消泡剂Defom5300、0.5份润湿剂TEGOWet KL 245、1.1份流平剂BYK-320进行混合并搅拌至均匀，形成胶液；以上份数均以重量份数计；
(3)将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为45s；
(4)将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25℃，固化时间为10s。
本实施例步骤(3)中所提及的纳米晶磁芯是按照公开号为CN109754973A的发明专利实施例1中的方法制备得到的经热处理后的铁芯，磁芯型号规格为15/21*10(内径15mm，外径21mm，高度10mm)。
对比例1
(1)将60份丙烯酸环氧树脂、18份双酚A环氧丙烯酸酯、9份二丙二醇二丙烯酸酯、2份1-羟基环己基苯基甲酮、1份消泡剂Defom5300、1.5份润湿剂TEGO Wet KL 245、1.5份流平剂BYK-320进行混合并搅拌至均匀，形成胶液；以上份数均以重量份数计；
(2)将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为45s；
(3)将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25℃，固化时间为10s。
本实施例步骤(2)中所提及的纳米晶磁芯是按照公开号为CN109754973A的发明专利实施例1中的方法制备得到的经热处理后的铁芯，磁芯型号规格为15/21*10(内径15mm，外径21mm，高度10mm)。
对比例2
采用与实施例1相同的方法，其区别仅在于，将双酚A环氧丙烯酸酯替换为聚氨酯丙烯酸酯。
对比例3
采用与实施例1相同的方法，其区别仅在于，将二丙二醇二丙烯酸酯替换为1,6-己二醇二丙烯酸酯。
对比例4
采用与实施例1相同的方法，其区别仅在于，将1-羟基环己基苯基甲酮替换为2-羟基-2甲基-1苯基-1-丙酮。
采用HT35磁芯测试仪(上海亨通磁电科技有限公司)测试各实施例和对比例中磁芯(型号规格为15/21*10)在固化前后的性能数据，其中，设定输入电流3mA，记录输出电压值(mV)并计算电压变化率，电压变化率(％)＝(固化后电压-固化前电压)/固化前电压*100，结果如表1所示。
表1
电压变化率(％)
实施例1 -4.87
实施例2 -5.22
实施例3 -5.16
对比例1 -17.68
对比例2 -14.30
对比例3 -12.94
对比例4 -12.77
由表1可以看到，固化前后磁芯性能数据下降率在4～5％之间，相比现有固化工艺下降10％的情况，经过本发明方法固化后的磁芯的性能提高了约5％。
可以理解的是，以上关于本发明的具体描述，仅用于说明本发明而并非受限于本发明实施例所描述的技术方案。本领域的普通技术人员应当理解，仍然可以对本发明进行修改或等同替换，以达到相同的技术效果；只要满足使用需要，都在本发明的保护范围之内。

Claims (3)

1.一种纳米晶磁芯的固化方法，其特征在于，包括以下步骤：
(1)将40～60份聚氨酯改性环氧树脂、15～30份双酚A环氧丙烯酸酯、8～15份二丙二醇二丙烯酸酯、2～4份1-羟基环己基苯基甲酮、0.2～1份消泡剂、0.3～1.5份润湿剂、0.5～1.5份流平剂进行混合并搅拌至均匀，形成胶液；以上份数以重量份数计；
(2)将热处理后的纳米晶磁芯浸泡至胶液中，浸泡时间为30～60s；
(3)将浸胶后的磁芯晾至表面无残余胶液后采用UV光固化仪对浸胶后的磁芯进行固化，固化温度为25～30℃，固化时间为5～15s；
步骤(1)所述的聚氨酯改性环氧树脂的制备步骤为：将10份聚酯多元醇加热至90℃回流脱水，降温，加入4份二苯基甲烷二异氰酸酯于55℃反应1h，冷却至室温，加入2份1,4-丁二醇和0.1份三羟甲基丙烷搅拌均匀得聚氨酯预聚体，再将120份双酚A环氧树脂加入到聚氨酯预聚体中反应1h，得聚氨酯改性环氧树脂；以上份数以重量份数计。
2.如权利要求1所述的纳米晶磁芯的固化方法，其特征在于，步骤(1)中的胶液由以下质量份的成分组成：
聚氨酯改性环氧树脂50份
双酚A环氧丙烯酸酯25份
二丙二醇二丙烯酸酯12份
1-羟基环己基苯基甲酮3份
消泡剂0.6份
润湿剂1.2份
流平剂1.2份。
3.如权利要求1所述的纳米晶磁芯的固化方法，其特征在于，所述消泡剂采用Defom5300，润湿剂采用TEGOWetKL245，流平剂采用BYK-320。
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