CN110128933B - 一种聚氨酯三防漆及其制备方法 - Google Patents

一种聚氨酯三防漆及其制备方法 Download PDF

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CN110128933B
CN110128933B CN201910442561.XA CN201910442561A CN110128933B CN 110128933 B CN110128933 B CN 110128933B CN 201910442561 A CN201910442561 A CN 201910442561A CN 110128933 B CN110128933 B CN 110128933B
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刘兴江
李亚起
魏柳荷
孙爱灵
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Abstract

本发明公开了一种新型聚氨酯三防漆及其制备方法，属于涂料技术领域。以质量百分数计算，由下列组份组成：成膜树脂15.6～24.9份，助剂3.6～5.3份，溶剂70.7～81.5份。本发明制备的聚氨酯三防漆具有粘度小，表干速度快，不发生黄变以及附着性好的特点，具有优异的力学性能、耐溶剂性能、耐酸碱性能、耐高低温性、耐候性和电绝缘性能。而且不含甲苯、二甲苯等芳香烃类溶剂，符合欧盟RoHS环保要求。

Description

一种聚氨酯三防漆及其制备方法
技术领域
本发明涉及一种聚氨酯三防漆及其制备方法，属于涂料技术领域。
背景技术
电子行业常将产品的防潮湿、防盐雾、防霉菌技术称为“三防”技术，因此也常将电路板防护层称之为“三防漆”。三防漆(Conformal Coating)是一种特殊配方的涂料，具有良好的耐高低温性能，以及优越的绝缘、防潮、防漏电、防震、防尘、防腐蚀、防老化和耐电晕等性能。电路板三防漆，覆于线路板的表面，形成一层轻薄致密、坚韧绝缘的保护膜，用于线路板的防护，使其免受坏境的侵蚀，从而确保电子信息产品的安全性和可靠性，增加其安全系数，提高它们的使用寿命。由于电路板三防漆具有优良的电绝缘性能，因此允许更高的功率和更近的印刷间距，从而可满足元件小型化、轻量化的目的。聚氨酯三防漆具有优良的电绝缘性能、防潮性能、耐溶剂性能、耐盐雾腐蚀性能和抗化学品性能，耐磨性好、附着力好。但是单纯的聚氨酯耐高温性能比较差，在固化过程对水敏感，涂层抗热性差、易泛黄，因此现有聚氨酯型三防漆大都采用有机硅树脂或醇酸树脂对聚氨酯进行改性以提高产品的耐热性能。本发明制备的聚氨酯三防漆主要通过硅烷偶联剂和耐黄变剂对聚氨酯进行改性，同样也可以得到性能优良的聚氨酯三防漆，而且相对于现有聚氨酯三防漆来说工艺简单，操作方便，而且还具有价格优势，符合市场大众的需求。
发明内容
本发明的目的是提供一种新型聚氨酯三防漆及其制备方法。
本发明涉及的聚氨酯三防漆及由如下质量份数的原料组成：
成膜树脂 15.6～24.9份
助剂 3.6～5.3份
溶剂 70.7～81.5份
其中，所述成膜树脂是由多异氰酸酯、聚醚多元醇、低分子量二元醇和硅改性剂聚合得到，各组分及质量份数如下：
多异氰酸酯 24.5～29.7份
聚醚多元醇 50.8～59.1份
扩链剂 3.2～4.5份
改性剂 6.7～9.1份。
本发明所述的多异氰酸酯为甲苯二异氰酸酯(TDI)、二苯基甲烷二异氰酸酯(MDI)、异佛尔酮二异氰酸酯(IPDI)和六亚甲基二异氰酸酯(HDI)中的一种或多种混合物。
本发明所述的聚醚多元醇为聚醚二元醇和聚醚三元醇的混合物，聚醚多元醇为聚氧化丙烯醚、聚氧化乙烯醚、聚四亚甲基醚，数均分子量600～8000g/mol。
本发明所述的扩链剂为小分子的一缩二乙二醇(DEG)、1,4-丁二醇(BDO)、三羟甲基丙烷(TMP)、乙二胺(EN)和异佛尔酮二胺(IPDA)中的一种或多种混合物。本发明所述的改性剂为硅烷偶联剂A-189、A-1170、A-1110、Y-11542和Y-9669中的一种或多种混合物。
本发明所述的助剂中包括0.8～1.2份的流平剂Capstone FS-3100、Efka-3777、3772、KYC-626、546、EONLEO-2503、2603、TEGO Flow 300、BZ209F中的一种或多种混合物。
本发明所述的助剂中包括0.8～1.5份的荧光剂。
本发明所述的助剂中包括1.0～2.0份的潜固化剂Alt-101、102和SLD-910、JH-326、328中的一种或多种混合物。
本发明所述的助剂中包括0.5～1.0份的催化剂二丁基二氯化锡、二月桂酸二丁基锡、双吗啉基二乙基醚、N-甲基吗啉、环烷酸铅、环烷酸钴中的一种或多种混合物。
本发明所述的助剂中包括0.5～1.0份的耐老化剂BETTERSOL-1725、1534和1513中的一种或多种混合物。
本发明所述的溶剂为乙酸乙酯、乙酸丁酯、醋酸异戊酯、醋酸异丁酯、乙二醇甲醚醋酸酯和丙二醇甲醚醋酸酯中的一种或多种混合物。
具体实施方法
本发明所述的聚氨酯三防漆的制备方法如下：
(a)在配有加热、机械搅拌和真空装置的四口烧瓶中，加入计算量的聚醚多元醇，抽真空(-0.1MPa)并加热到105～115℃保持2小时；
(b)停止加热，降温到80±2℃，向四口瓶中充入氩气解除真空，加入计算量的多异氰酸酯反应1小时；
(c)停止加热，降温到60±2℃，加入催化剂反应45分钟；
(d)加入计算量的扩链剂，80±2℃继续反应1小时；
(e)降温到40～50℃，加入改性剂反应30分钟即可得到所需成膜树脂；
(f)加入计算量的溶剂，再加入流平剂，荧光剂，耐老化剂，潜固化剂和快干催化剂等助剂，搅拌均匀，停止反应，降温出料即可得到聚氨酯三防漆。
实施例
实施例1
在配有加热、机械搅拌和真空装置的四口烧瓶中，加入59.13g聚醚三元醇F3050A，抽真空(-0.1MPa)加热到105～115℃保持2小时；停止加热，降温到80±2℃，向四口瓶中充入氩气解除真空，加入29.51g改性MDI 3133反应1小时；停止加热，降温到60±2℃，加入催化剂二丁基二氯锡盐0.2g反应45分钟；加入4.54g 1,4-丁二醇，80±2℃继续反应1小时；降温到40～50℃，加入6.82g硅烷偶联剂Y-9669反应30分钟；最后加入助剂：2.0g流平剂Efka-3777、4.0g(1:100)稀释的非离子含氟表面活性剂Capstone FS-3100、4.0g(1:100)稀释的荧光剂、4.0g(1:100)稀释的抗黄变剂Bettersol 1534、8.0g潜固化剂Alt-101、2.0g催化剂双吗啉基二乙基醚DMDEE和209.3g溶剂丙二醇甲醚醋酸酯PMA，搅拌均匀，降温出料即可得到聚氨酯三防漆。
实施例2
在配有加热、机械搅拌和真空装置的四口烧瓶中，加入59.36g聚醚三元醇F3050A，抽真空(-0.1MPa)加热到105～115℃保持2小时；停止加热，降温到80±2℃，向四口瓶中充入氩气解除真空，加入29.58g改性MDI 3133反应1小时；停止加热，降温到60±2℃，加入催化剂二丁基二氯锡盐0.2g反应45分钟；加入4.31g二乙二醇，80±2℃继续反应1小时；降温到40～50℃，加入6.75g硅烷偶联剂Y-9669反应30分钟；最后加入助剂：2.0g流平剂Efka-3777、4.0g(1:100)稀释的非离子含氟表面活性剂Capstone FS-3100、4.0g(1:100)稀释的荧光剂、4.0g(1:100)稀释的抗黄变剂Bettersol 1534、8.0g潜固化剂Alt-101、2.0g催化剂双吗啉基二乙基醚DMDEE和209.3g溶剂丙二醇甲醚醋酸酯PMA，搅拌均匀，降温出料即可得到聚氨酯三防漆。
实施例3
在配有加热、机械搅拌和真空装置的四口烧瓶中，加入41.67g聚醚三元醇C310和8.33g聚醚二元醇C210，抽真空(-0.1MPa)加热到105～115℃保持2小时；停止加热，降温到80±2℃，向四口瓶中充入氩气解除真空，加入40.5g改性MDI 3133反应1小时；停止加热，降温到60±2℃，加入催化剂二丁基二氯锡盐0.2g反应45分钟；加入3.62g 1,4-丁二醇，80±2℃继续反应1小时；降温到40～50℃，加入5.83g硅烷偶联剂Y-9669反应30分钟；最后加入助剂：2.0g流平剂Efka-3777、4.0g(1:100)稀释的非离子含氟表面活性剂Capstone FS-3100、4.0g(1:100)稀释的荧光剂、4.0g(1:100)稀释的抗黄变剂Bettersol 1534、8.0g潜固化剂Alt-101、2.0g催化剂双吗啉基二乙基醚DMDEE和209.3g溶剂丙二醇甲醚醋酸酯PMA，搅拌均匀，降温出料即可得到聚氨酯三防漆。
实施例4
在配有加热、机械搅拌和真空装置的四口烧瓶中，加入41.36g聚醚三元醇C310和8.27g聚醚二元醇C210，抽真空(-0.1MPa)加热到105～115℃保持2小时；停止加热，降温到80±2℃，向四口瓶中充入氩气解除真空，加入40.2g改性MDI 3133反应1小时；停止加热，降温到60±2℃，加入催化剂二丁基二氯锡盐0.2g反应45分钟；加入4.39g对苯二酚，80±2℃继续反应1小时；降温到40～50℃，加入5.79g硅烷偶联剂Y-9669反应30分钟；最后加入助剂：2.0g流平剂Efka-3777、4.0g(1:100)稀释的非离子含氟表面活性剂Capstone FS-3100、4.0g(1:100)稀释的荧光剂、4.0g(1:100)稀释的抗黄变剂Bettersol 1534、8.0g潜固化剂Alt-101、2.0g催化剂双吗啉基二乙基醚DMDEE和209.3g溶剂丙二醇甲醚醋酸酯PMA，搅拌均匀，降温出料即可得到聚氨酯三防漆。
本发明制备的聚氨酯三防漆具有粘度小，表干速度快，不发生黄变以及附着性好的特点，具有优异的力学性能、耐溶剂性能、耐酸碱性能、耐高低温性、耐候性和电绝缘性能。而且不含甲苯、二甲苯等芳香烃类溶剂，符合欧盟RoHS环保要求。
以上所述仅为本发明的实施例而已，并不用于限制本发明。本发明可以有各种合适的更改和变化。凡在本发明的精神和原则之内所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (8)

1.一种聚氨酯三防漆，其特征在于，由如下质量份数的原料组成：
成膜树脂15.6～24.9份
助剂3.6～5.3份
溶剂70.7～81.5份
其中，所述成膜树脂是由多异氰酸酯、聚醚多元醇、低分子量扩链剂和改性剂聚合得到，各组分及质量份数如下：
多异氰酸酯24.5～29.7份
聚醚多元醇50.8～59.1份
扩链剂3.2～4.5份
改性剂6.7～9.1份；
所述的聚醚多元醇为聚醚二元醇和聚醚三元醇的混合物，聚醚多元醇为聚氧化丙烯醚、聚氧化乙烯醚、聚四亚甲基醚，数均分子量600～8000g/mol；
所述的扩链剂为小分子的一缩二乙二醇、1,4-丁二醇、三羟甲基丙烷、乙二胺和异佛尔酮二胺中的一种或多种混合物；
所述的改性剂为硅烷偶联剂A-189、A-1170、A-1110、Y-11542和Y-9669中的一种或多种混合物；
所述的溶剂为乙酸乙酯、乙酸丁酯、醋酸异戊酯、醋酸异丁酯、乙二醇甲醚醋酸酯和丙二醇甲醚醋酸酯中的一种或多种混合物。
2.根据权利要求1所述的聚氨酯三防漆，其特征在于，所述多异氰酸酯为甲苯二异氰酸酯、二苯基甲烷二异氰酸酯、异佛尔酮二异氰酸酯和六亚甲基二异氰酸酯中的一种或多种混合物。
3.根据权利要求1所述的聚氨酯三防漆，其特征在于，所述的助剂中包括0.8～1.2份的流平剂。
4.根据权利要求1所述的聚氨酯三防漆，其特征在于，所述的助剂中包括0.8～1.5份的荧光剂。
5.根据权利要求1所述的聚氨酯三防漆，其特征在于，所述的助剂中包括1.0～2.0份的潜固化剂。
6.根据权利要求1所述的聚氨酯三防漆，其特征在于，所述的助剂中包括0.5～1.0份的催化剂二丁基二氯化锡、二月桂酸二丁基锡、双吗啉基二乙基醚、N-甲基吗啉、环烷酸铅、环烷酸钴中的一种或多种混合物。
7.根据权利要求1所述的聚氨酯三防漆，其特征在于，所述的助剂中包括0.5～1.0份的耐老化剂。
8.如权利要求1所述的聚氨酯三防漆的制备方法如下：
(a)在配有加热、机械搅拌和真空装置的四口烧瓶中，加入计算量的聚醚多元醇，抽真空并加热到105～115℃保持2小时；
(b)停止加热，降温到80±2℃，向四口瓶中充入氩气解除真空，加入计算量的多异氰酸酯反应1小时；
(c)停止加热，降温到60±2℃，加入催化剂反应45分钟；
(d)加入计算量的扩链剂，80±2℃继续反应1小时；
(e)降温到40～50℃，加入改性剂反应30分钟即可得到所需成膜树脂；
(f)加入计算量的溶剂，再加入流平剂，荧光剂，耐老化剂，潜固化剂和催化剂助剂，搅拌均匀，降温出料即得到聚氨酯三防漆。
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