CN104693914A - 一种水性防腐涂料及其制备方法 - Google Patents

一种水性防腐涂料及其制备方法 Download PDF

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CN104693914A
CN104693914A CN201310655641.6A CN201310655641A CN104693914A CN 104693914 A CN104693914 A CN 104693914A CN 201310655641 A CN201310655641 A CN 201310655641A CN 104693914 A CN104693914 A CN 104693914A
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张森
刘兆东
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QINGDAO HUICHENG PETROCHEMICAL TECHNOLOGY Co Ltd
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Abstract

本发明提供了一种水性防腐涂料及其制备方法，属于涂料技术领域。包括有按重量百分比计的如下组分:10～45%的水性环氧树脂、5%～20%的硅溶胶、5%～15%的防腐颜料、20～40%的颜填料、0.5～5%的助剂和10～15%的水:上述的防腐颜料是磷酸锌、改性磷酸锌、钼酸锌一种或几种任意比例混合物:上述的助剂是由润湿剂、分散剂、成膜助剂、pH调节剂、消泡剂、流变助剂t主任意比例混合物。本水性防腐涂料与金属的附着力、防腐性能、硬度以及耐化学性能较优，耐盐雾性能超过1000小时。

Description

一种水性防腐涂料及其制备方法
技术领域
本发明涉及钢铁的腐蚀防护领域，具体为一种水性防腐涂料及其制备万法。
背景技术
辞铭涂层(达克罗涂层)是二十世纪五十年代发展并开始进入工业领域应用的金属防腐涂层，具有高防护性能、无氢脆等综合优质的特性，问世后得到了广泛和迅猛的发展。主要应用于汽车、机械、交通、隧道、军事、桥梁等行业，该处理技术成为电镀辞、热浸镀锌、磷化等多种传统表面处理技术的最佳替代工艺。但由于辞铭涂层高效的防护能力主要依赖涂层中的六价铭元素，其对环境的影响也随人们环保意识的增强逐渐显现。欧盟在2006年7月1日实施RoHS指令，即《电气、电子设备中限制使用某些有害物质指令))，出口欧盟的电子电气设备中禁止使用或含有六种有害物质，其中就包括六价铭。这成为我国产品出口欧盟的技术壁垒。所以不含六价铭等有害金属元素的防腐技术的研究开发就迫在眉睫，具有可观的经济和社会效益。
发明内容
本发明的目的在于克服现有技术存在的上述不足，提出→种环保无铭水性防腐涂料及其制备方法和应用。
本发明给出的技术方案是:这种水性防腐涂料，其特点是其组分按重量
百分数为:
成膜树脂3～50;
辞钼粉15～80;
添加剂3～10;
去离子水5～15;
分散剂8～30;
助剂1～3
本发明所选用的成膜树脂主要为水性树脂，可以是水性环氧树脂、水性氟树脂、水性醇酸树脂、水性有机硅树脂、水性聚氨醋中的一种或一种以上。成膜助剂为钦酸四丁醋、硅酸四乙醋、硅炕偶联剂174以及硅炕偶联剂151在涂料成膜过程中可分解帮助成膜，一般不超过成膜树脂质的2%。
本发明所选用的辞钼粉是片状辞钼粉，片径一般不大于20微米，厚度不大于0.2微米，其中辞:钼=7.5～8.5:1.5～2.5。其作用是通过阴极保护作用以及物理屏蔽作用来防护基体。
本发明所选用的添加剂为下述的一种或一种以上，它们分别是锡粉，超细钦粉，镇粉，棚酸，纳米二氧化钦，二氧化硅，纳米氧化钼，氧化镑，磷酸镑，其中锡粉、超细钦粉、保粉、纳米氧化钼的粒径均小于10微米或与铮钼粉的粒径相同。各种添加剂通过搅拌在金属粉中均匀分散，帮助填补涂层在成型过程中形成的缺陷，具有缓蚀作用。
本发明所选用的分散剂为广泛采用的醇类及其隧类，如异丙醇、叔丁醇、乙二醇及其瞠或丙二醇及其隧中的一种或一种以上，其作用是促进金属粉及添加剂的良好分散。
本发明给出的这种水性防腐涂料的制备方法为:
(1).按所述比例将助剂和少量去离子水加入到成膜树脂中，用分散机充分搅拌分散均匀;
(2).按所述比例将金属粉和添加物在搅拌条件下同时加入分散剂及助剂中，用分散机充分搅拌分散均匀:
(3).将上述步骤（1）和步骤(2)混合物在搅拌条件下缓慢混合，持续搅拌30分钟，得成品涂料。
本发明给出的这种水性防腐涂料的应用为:涂料为单组分，涂料的涂敷方式为刷涂、喷涂或浸涂:采用加热固化方式，先在70℃～80℃烘干30分钟左右，再在220℃～260℃进行固化。膜层表面光亮均匀，结合力好。
与现有技术相比，本发明的有益效果是:
1、本发明中使用的成膜物都是水溶性的，不含挥发性的二甲苯等有害物，也不含铭元素。涂料可以单组分存在，具有良好的稳定性:
2、本发明所选用的添加剂，能有效地降低涂层固化导致的微裂纹，增强涂层的耐蚀性能。
3、本发明中涂料的配制可在室温下进行，不需要温度条件的控制，降低施工成本。
4、本发明涂料在15微米的膜层厚度下，可以达到200小时的盐雾试验无锈点。
具体实施方式
实施例1
原料名称 用量（g）
水性氟树脂 20
去离子水 5
乙二醇甲醚 10
锌钼粉 60
偶联剂（有机硅烷174） 3
锡粉 2
超细钛粉 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为160小时。
实施例2:
与实施例1不同之处在于，该防腐涂料的基本配方为:
原料名称 用量(g)
水性醇酸树脂 20
去离子水 8
乙二醇丁醚 15
锌铝粉 70
钛酸四丁酯 3
纳米氧化铝 2
超细钛粉 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为200小时。
实施例3:
与实施例1不同之处在于，该防腐涂料的基本配方为：
原谅名称 用量（g）
水性有机硅树脂 25
去离子水 15
乙二醇乙醚 15
锌钼粉 50
钛酸四丁酯 3
硼酸 2
纳米氧化钼 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为190小时。
实施例4：
与实施例1不同之处在于，该防腐涂料的基本配方为：
原料名称 用量(g)
水性环氧树脂 25
去离子水 15
丙二醇 15
锌铝粉 50
钛酸四丁酯 3
硼酸 2
纳米氧化铝 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为185小时。
实施例5：
与实施例1不同之处在于，该防腐涂料的基本配方为：
原料名称 用量(g)
水性聚氨酯 25
去离子水 15
异丙醇 15
锌铝粉 50
偶联剂(174) 3
镍粉 2
纳米二氧化钛(锐钛矿相) 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为175小时。
实施例6：
与实施例1不同之处在于，该防腐涂料的基本配方为：
原料名称 用量(g)
水性醇酸树脂 25
去离子水 15
乙二醇丁醚 15
锌铝粉 50
偶联剂(174) 3
磷酸锌 2
二氧化硅 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为180小时。
实施例7:
与实施例1不同之处在于，该防腐涂料的基本配方为:
原料名称 用量(g)
水性环氧树脂 25
去离子水 15
丙二醇 15
锌铝粉 50
钛酸四丁酯 3
二氧化硅 2
锡粉 2
将上述原料按比例进行搅拌分散，配制成防腐涂料，喷涂于碳钢，涂层厚度15微米左右，中性盐雾试验出现红锈时间为190小时。

Claims (6)

1.一种水性防腐涂料，包括有按重量百分比计的如下组分:10～45%的水性环氧树脂、5%～20%的硅溶胶、5～15%的防腐颜料、20%～40%的颜填料、0.5%～5%的助剂和10%～15%的水;所述的防腐颜料是磷酸锌、改性磷酸锌、钼酸锌一种或几种任意比例混合物;所述的助剂是由润湿剂、分散剂、成膜助剂、pH调节剂、消泡剂、流变助剂按任意比例混合物。
2.根据权利要求1所述的水性防腐涂料，其特征在于:所述的颜填料是氧化铁红、铁白粉、硫酸钡、滑石粉、云母粉中的一种或几种任意比例的混合物。
3.根据权利要求1所述的水性防腐涂料，其特征在于:所述的防腐颜料中还含有三聚磷酸铝、钙离子交换颜料的任一种或两者的任意比例混合物。
4.根据权利要求1所述的水性防腐涂料，其特征在于:水性环氧树脂的重量是硅溶胶重量的1～9倍。
5.根据权利要求4所述的水性防腐涂料，其特征在于:水性环氧树脂的重量是硅溶胶重量的3～5倍。
6.一种制备水性防腐涂料的方法，包括以下步骤:将水性环氧树脂、硅溶胶、润湿剂、分散剂、成膜助剂、pH调节剂、消泡剂和水混合搅拌均匀;然后边搅拌边加入防腐颜料及颜填料，搅拌均匀;加入流变助剂，搅拌均匀，得水性防腐涂料。
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