CN105482605A - 水溶性硅钢片绝缘漆及其制备方法 - Google Patents

水溶性硅钢片绝缘漆及其制备方法 Download PDF

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CN105482605A
CN105482605A CN201511009387.8A CN201511009387A CN105482605A CN 105482605 A CN105482605 A CN 105482605A CN 201511009387 A CN201511009387 A CN 201511009387A CN 105482605 A CN105482605 A CN 105482605A
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马苗
金丹华
袁李岩
徐伟
刘攀登
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Zhejiang Rongtai Technology Enterprise Co Ltd
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Abstract

一种水溶性硅钢片绝缘漆，按重量份，包括32～36水性树脂分散体、5～7酰肼固化剂、55～58无机填料和1～5助剂。本发明的水溶性硅钢片绝缘漆，以聚氨酯改性环氧树脂做为分散基体，由于聚氨酯具有附着性及柔韧性优异的特性，使得改性后的水溶性硅钢片漆漆膜附着性高，冲片震动或受外力作用时不易剥落，实现了良好的绝缘效果，电机使用寿命延长，可靠性高。

Description

水溶性硅钢片绝缘漆及其制备方法
技术领域
本发明涉及一种绝缘树脂，尤其涉及一种用于硅钢片的水溶性绝缘漆，具有粘度低、稳定性好和附着性高等特点。
背景技术
随着大电机容量的增大，对电机定子铁芯可靠性的要求也逐渐提升，这主要取决于制备电机铁芯的硅钢片表面涂层材料的性能。基于对环保、硅钢片热压收缩性、耐热性要求的不断提高，目前用于硅钢片表面绝缘的漆液大部分为含有填料的水溶性半无机硅钢片漆，然而这种硅钢片漆通常粘度高同时非挥发物含量低，漆液在短期储存过程易于沉降，且不能通过搅拌再次恢复均匀状态。此外，固化后的漆膜附着性差，受震动或外力后易于剥落，导致冲片间绝缘性损失。因而，研制一种粘度低同时非挥发物含量高，漆液存储稳定、不易沉降，固化后漆膜附着性高的水溶性半无机硅钢片绝缘漆是目前大电机绝缘领域之急需。
发明内容
本发明的一个目的在于提供一种水溶性硅钢片绝缘漆，利用附着性优异、柔韧性好的聚氨酯改性水溶性环氧作为分散体，通过不同粒径的填料复配，并添加高效润湿分散剂，解决了普通水溶性硅钢片漆粘度高、非挥发物含量低，存储稳定性差、易于沉降，漆膜附着力不良等问题。
本发明的另一个目的在于提供一种水溶性硅钢片绝缘漆的制取方法。
为实现上述发明目的，本发明提供的一种水溶性硅钢片绝缘漆，按重量份，包括：
本发明水溶性硅钢片绝缘漆，水性树脂分散体为聚氨酯改性水性环氧树脂。
一种制取聚氨酯改性水性环氧树脂的方法，包括如下步骤：
先将二异氰酸酯(如：4,4’-二苯基甲烷二异氰酸酯)和聚酯多元醇(如：分子量500～1,000)加入N-甲基吡咯烷酮中，异氰酸酯基团的摩尔量与羟基的摩尔量之比为1.3～1.8，于50℃～60℃反应至异氰酸酯基团的含量达到稳定值，得到聚氨酯预聚物；
然后，在氮气保护下，将环氧树脂和聚氨酯预聚物按羟基的摩尔量与异氰酸酯基团的摩尔量之比为1.4～2混合均匀，于60～80℃下反应2～3小时，得到聚氨酯改性环氧树脂；
接着，将聚氨酯改性环氧树脂和引发剂(如：过氧化苯甲酰)加入溶剂(如：异丁醇)，于100℃～120℃再加入甲基丙烯酸和丙烯酸丁酯，使得甲基丙烯酸、丙烯酸丁酯、聚氨酯改性环氧树脂的质量比为20～30∶30～40∶100(如：25∶35∶100)，反应进行3～5小时后，降温至40℃～60℃，调整pH值为7.5～9.5，用水稀释后得到聚氨酯改性水性环氧树脂分散体。
将得到的聚氨酯改性水性环氧树脂分散体，按比例将聚氨酯改性水性环氧树脂分散体、酰肼固化剂M-16和助剂混合均匀，加入复合无机填料分散均匀即得水溶性硅钢片绝缘漆。
本发明水溶性硅钢片绝缘漆，酰肼固化剂如：型号为M-16，产自嘉兴荣泰雷帕司绝缘材料有限公司。
本发明水溶性硅钢片绝缘漆，无机填料如：但不仅限于二氧化钛和硫酸钡等。一种无机填料，按重量份，包括5份D50≤0.3微米的二氧化钛、25份D50≤100纳米的硫酸钡和70份D50≤2微米的硫酸钡复配而成。
本发明水溶性硅钢片漆，助剂如：但不仅限于消泡剂、流平剂及润湿分散剂(如：SN-5027)等，在漆液中的质量百分含量均为0.2w/w％～3.5w/w％。润湿分散剂为SN-5027(日本诺普科)以有效降低粘度。
本发明技术方案实现的有益效果：
本发明提供的水溶性硅钢片漆，以聚氨酯改性环氧树脂做为分散基体，由于聚氨酯具有附着性及柔韧性优异的特性，使得改性后的水溶性硅钢片漆漆膜附着性高，冲片震动或受外力作用时不易剥落，实现了良好的绝缘效果，电机使用寿命延长，可靠性高。
本发明水溶性硅钢片漆，采用不同粒径的硫酸钡和纳米二氧化钛复配制得无机填料，漆液在存储过程均匀稳定，填料不发生沉降。
本发明水溶性硅钢片漆，还采用了高效润湿分散剂如：SN-5027，有效实现了树脂和填料的浸润与分散，从而使得填料含量至少达到了55％，非挥发物含量达到了75％，同时粘度不大于130s。
具体实施方式
以下详细描述本发明的技术方案。本发明实施例仅用以说明本发明的技术方案而非限制，尽管参照较佳实施例对本发明进行了详细说明，本领域的普通技术人员应当理解，可以对发明的技术方案进行修改或者等同替换，而不脱离本发明技术方案的精神和范围，其均应涵盖在本发明的权利要求范围中。
实施例1
将100g4,4’-二苯基甲烷二异氰酸酯与250g分子量为1000聚己内酯二元醇溶于50gN-甲基吡咯烷酮中，于60℃反应至异氰酸酯基(-NCO)含量达到稳定值，得到聚氨酯预聚物，记为PU-1。
在氮气保护下，将100g环氧树脂E51和60g聚氨酯预聚物PU-1混合均匀，在75℃下反应3小时后，加入异丁醇及2％过氧化苯甲酰，于110℃将40g甲基丙烯酸和56g丙烯酸丁酯滴入聚氨酯改性环氧树脂体系中，0.5小时滴完后，保温反应4.5小时后，降温至50℃，用ANP-95中和至pH值为9.1，加入水，得到聚氨酯改性水性环氧树脂分散体，非挥发物含量为46.12％。
将36份上述聚氨酯改性水性环氧分散体、5份M-16、3份助剂混合均匀，加入56份复合无机填料分散均匀。润湿分散剂SN-5027(日本诺普科)的添加量为1.5份。
实施例2
在氮气保护下，将100g环氧树脂E51和48g聚氨酯预聚物PU-1混合均匀，在80℃下反应2.5小时后，加入异丁醇及2％过氧化苯甲酰，于110℃将37g甲基丙烯酸和51.8g丙烯酸丁酯滴入聚氨酯改性环氧树脂体系中，0.5小时滴完后，保温反应4小时后，降温至50℃，用ANP-95中和至pH值为8.4，加入适量水，得到聚氨酯改性水性环氧树脂分散体，非挥发物含量为43.34％。
将33份上述聚氨酯改性水性环氧分散体、6份M-16、4份助剂混合均匀，加入57份复合无机填料分散均匀。润湿分散剂SN-5027的添加量为2份。
实施例3
在氮气保护下，将100g环氧树脂E51和75g聚氨酯预聚物PU-1混合均匀，在80℃下反应3小时后，加入异丁醇及2％过氧化苯甲酰，于115℃将43.75g甲基丙烯酸和61.25g丙烯酸丁酯滴入聚氨酯改性环氧树脂体系中，1小时滴完后，保温反应4.5小时后，降温至50℃，用ANP-95中和至pH值为8.9，加入适量水，得到聚氨酯改性水性环氧树脂分散体，非挥发物含量为47.58％。
将35.5份上述聚氨酯改性水性环氧分散体、5.5份M-16、3.5份助剂混合均匀，加入55.5份复合无机填料分散均匀。润湿分散剂SN-5027的添加量为1.5份。
按上述实施例所制备的硅钢片漆及固化后的漆膜性能均能达到表1的性能指标，其中漆膜按GB/T1727-1992方法制备。
表1
按上述实施例所制备的硅钢片漆与市售漆的比较见表2。
表2

Claims (12)

1.一种水溶性硅钢片绝缘漆，其特征在于，按重量份，包括：
2.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的水性树脂分散体为聚氨酯改性水性环氧树脂。
3.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的水性树脂分散体为聚氨酯改性水性环氧树脂，制取所述的聚氨酯改性水性环氧树脂方法如下：
先将二异氰酸酯和聚酯多元醇加入N-甲基吡咯烷酮中，异氰酸酯基团的摩尔量与羟基的摩尔量之比为1.3～1.8，于50℃～60℃反应至异氰酸酯基团的含量达到稳定值，得到聚氨酯预聚物；
然后，在氮气保护下，将环氧树脂和聚氨酯预聚物按羟基的摩尔量与异氰酸酯基团的摩尔量之比为1.4～2混合均匀，于60～80℃下反应2～3小时，得到聚氨酯改性环氧树脂；
接着，将聚氨酯改性环氧树脂和引发剂加入溶剂，于100℃～120℃再加入甲基丙烯酸和丙烯酸丁酯，使得甲基丙烯酸、丙烯酸丁酯、聚氨酯改性环氧树脂的质量比为20～30∶30～40∶100，反应进行3～5小时后，降温至40℃～60℃，调整pH值为7.5～9.5，用水稀释后得到聚氨酯改性水性环氧树脂分散体。
4.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的二异氰酸酯为4,4’-二苯基甲烷二异氰酸酯。
5.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的聚酯多元醇分子量为500～1,000。
6.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的引发剂为过氧化苯甲酰。
7.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的溶剂为异丁醇。
8.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的无机填料，按重量份，包括5份D50≤0.3微米的二氧化钛、25份D50≤100纳米的硫酸钡和70份D50≤2微米的硫酸钡。
9.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的助剂包括消泡剂、流平剂及润湿分散剂。
10.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的助剂包括消泡剂、流平剂及润湿分散剂，所述的润湿分散剂为SN-5027。
11.根据权利要求1所述的水溶性硅钢片绝缘漆，其特征在于所述的助剂包括0.2w/w％～3.5w/w％消泡剂、0.2w/w％～3.5w/w％流平剂及0.2w/w％～3.5w/w％润湿分散剂。
12.一种制取权利要求1所述的水溶性硅钢片绝缘漆的方法，包括如下步骤：
先将二异氰酸酯和聚酯多元醇加入N-甲基吡咯烷酮中，异氰酸酯基团的摩尔量与羟基的摩尔量之比为1.3～1.8，于50℃～60℃反应至异氰酸酯基团的含量达到稳定值，得到聚氨酯预聚物；
然后，在氮气保护下，将环氧树脂和聚氨酯预聚物按羟基的摩尔量与异氰酸酯基团的摩尔量之比为1.4～2混合均匀，于60～80℃下反应2～3小时，得到聚氨酯改性环氧树脂；
接着，将聚氨酯改性环氧树脂和引发剂加入溶剂，于100℃～120℃再加入甲基丙烯酸和丙烯酸丁酯，使得甲基丙烯酸、丙烯酸丁酯、聚氨酯改性环氧树脂的质量比为20～30∶30～40∶100，反应进行3～5小时后，降温至40℃～60℃，调整pH值为7.5～9.5，用水稀释后得到聚氨酯改性水性环氧树脂分散体；
按重量份，将32～36聚氨酯改性水性环氧树脂分散体、5～7酰肼固化剂和1～5助剂混合均匀，加入55～58无机填料分散均匀即得。
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CN106867390A (zh) * 2017-03-13 2017-06-20 哈尔滨理工大学 水溶性聚氨酯免洗针脚绝缘漆及其制备方法
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