CN106497317A - 一种钢结构用低表面处理水性环氧底漆及其制备方法 - Google Patents

一种钢结构用低表面处理水性环氧底漆及其制备方法 Download PDF

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CN106497317A
CN106497317A CN201610901143.9A CN201610901143A CN106497317A CN 106497317 A CN106497317 A CN 106497317A CN 201610901143 A CN201610901143 A CN 201610901143A CN 106497317 A CN106497317 A CN 106497317A
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Abstract

本发明公开一种钢结构用低表面处理水性环氧底漆,由以下重量份的原料组成:环氧树脂50‑70,腰果酚16‑21,甲醛溶液14‑23,异氟尔酮二胺18‑25,KH550 2‑4,凹凸棒土3‑8,1mol/L盐酸溶液适量,苄基三乙基氯化铵0.6‑1.5,30%的氢氧化钠溶液15‑20,去离子水适量,硬脂酰胺1‑2,环氧稀释剂1‑5,滑石粉3‑6,铁红2‑5,有机膨润土4‑8。本文利用凹凸棒土表面上的硅羟基与腰果酚发生醚化交联反应,再通过化学反应制备改性腰果酚醛胺固化剂,改性固化剂既具有一般腰果酚酰胺固化剂的优点,又兼具凹凸棒土的优点,制备的环氧涂料具有耐黄变性较好、可低温固化和防腐性能优异的特点。

Description

一种钢结构用低表面处理水性环氧底漆及其制备方法
技术领域
本发明属于涂料领域,特别涉及一种钢结构用低表面处理水性环氧底漆及其制备方法。
背景技术
近年来世界各国涂料行业加紧对低VOC排放的环保型涂料的研究,水性防腐涂料大大减少甚至完全消除了VOC排放,而且使用安全方便,以迅速发展。单组分水性防腐涂料采用的基料聚合物乳液多为热塑型,涂膜硬度、耐介质性、耐污染等性能难以达到溶剂型工业涂料水平。因而近年来人们开始致力于双组分水性防腐涂料的研究。双组分水性环氧防腐涂料可以室温交联固化,附着力强,机械强度高,耐化学介质性能好,其性能可以达到溶剂型环氧涂料水平,因而可以替代溶剂型环氧防腐涂料,应用于钢结构防腐。
聚酰胺类固化剂能与环氧树脂常温下固化成膜,固化后的漆膜具有良好的防腐性和柔韧性。但干燥时间长,其最大的缺点是低温固化性能较差,一般情况下,温度低于10℃时就无法进行正常施工,而我国大部分地区的冬天温度都在5℃以下,而大型钢结构基本在室外施工,这就限制了其在冬季的使用。
赵科明、王飞镝、邱清华等人在其《腰果酚改性胺类环氧地坪固化剂的合成及性能研究》一文中,以天然产物废弃物腰果壳提取的腰果酚为原料,同甲醛和多元胺(二乙烯三胺,三乙烯四胺,间苯二甲胺,异佛尔酮二胺)反应,合成胺系环氧地坪固化剂,既有脂肪胺的常温快速固化和优良的耐化学品性,又有低分子量聚酰胺的低毒、良好柔韧性。但由于腰果酚分子中的酚羟基-OH不参与反应,改性后的固化剂中含有弱酸的酚羟基,使其涂膜易被氧化且抗碱性不佳,容易吸收紫外光,发生共聚,固化的环氧涂料黄变现象特别严重。
因此,本文利用凹凸棒土表面上的硅羟基与腰果酚发生醚化交联反应,再通过化学反应制备改性腰果酚醛胺固化剂,改性固化剂既具有一般腰果酚酰胺固化剂的优点,又兼具凹凸棒土的优点,形成相对稳定的固化体系,明显改善了环氧树脂固化涂膜的耐黄变性能。
发明内容
针对现有技术的不足,本发明提供一种钢结构用低表面处理水性环氧底漆及其制备方法,提高环氧树脂固化涂膜的耐黄变性能。
一种钢结构用低表面处理水性环氧底漆,由以下重量份的原料组成:环氧树脂50-70份,腰果酚16-21份,甲醛溶液14-23份,异氟尔酮二胺18-25份,KH550 2-4份,凹凸棒土3-8份,1mol/L盐酸溶液适量,苄基三乙基氯化铵0.6-1.5份,30%的氢氧化钠溶液15-20份,去离子水适量,硬脂酰胺1-2份,环氧稀释剂1-5份,滑石粉3-6份,铁红2-5份,有机膨润土4-8份。
具体步骤如下:
(1)凹凸棒土改性的腰果酚:
①、将凹凸棒土加入到KH550的水溶液中,用1mol/L盐酸溶液调节pH至3-4,常温搅拌处理12-18小时,之后用去离子水洗涤,1500-2500r/min离心,真空干燥,粉碎,过100-200目筛,备用;
②、将腰果酚、苄基三乙基氯化铵以及改性处理后的凹凸棒土加入反应瓶中,在70-90℃条件下恒温搅拌3-5小时,冷却至50-70℃,加入30%的氢氧化钠溶液,在条件下恒温搅拌2-4小时,冷却至室温,洗涤至中性,分离浓缩,得到凹凸棒土改性的腰果酚;
(2)改性腰果酚醛胺固化剂的制备:
将装有电动搅拌器、冷凝管的四口烧瓶置于30-50℃恒温水浴中,加入步骤(1)制备的凹凸棒土改性的腰果酚,边搅拌边滴加异佛尔酮二胺,再加入甲醛溶液搅拌均匀,水浴锅升温90-100℃,恒温反应2-4小时,降温至60-75℃,控制压力在0.0085-0.0095MPa进行减压蒸馏,制得改性腰果酚醛胺固化剂;
(3)A组分制备:
①、先将部分步骤(2)得到的改性腰果酚醛胺固化剂与消泡剂、水预混,之后加入铁黑、沉淀硫酸钡、滑石粉,经砂磨机研磨至细度小于30μm,制得色浆;
②、在搅拌状态下,向色浆中加入剩余的改性腰果酚醛胺固化剂、硬脂酰胺,搅拌15-30分钟,过滤即得组分A;
(4)将环氧树脂、环氧稀释剂混合充分后,作为组分B单独包装。
其中,步骤(1)所述的KH550的水溶液浓度为5%。
与现有技术相比,本发明具有以下优点:
(1)本发明使用硅烷偶联剂处理后的凹凸棒土含有的大量硅羟基结构,与腰果酚的酚羟基发生醚化交联反应,替代酚羟基结构,从而得到耐黄变性能更好的腰果酚基醚,在改性腰果酚醛胺固化剂的基础上,开发了一种新型环氧涂料,具有耐黄变性较好、可低温固化和防腐性能优异的特点。
(2)本发明中改性后的凹凸棒土与腰果酚的酚羟基发生醚化交联反应,同时含有氢键,再与异氟尔酮二胺、甲醛反应制得改性腰果酚醛胺固化剂,既具有一般腰果酚酰胺固化剂的优点,又兼具凹凸棒土的优点,明显提高改性固化剂的交联程度,形成相对稳定的固化体系,改善了环氧树脂固化涂膜的韧性、耐冲击性和耐热性。
(3)有机膨润土在研磨色浆时添加有助于颜料湿润、分散,另外它还具有极佳的防沉降性,尤其对颜料分高的底漆或黏度较低的涂料均有卓效,可赋予涂料良好的贮存稳定性。
具体实施方式
一种钢结构用低表面处理水性环氧底漆,由以下重量份(公斤)的原料组成:环氧树脂58,腰果酚18,甲醛溶液20,异氟尔酮二胺22,KH550 3,凹凸棒土6,1mol/L盐酸溶液适量,苄基三乙基氯化铵1.2,30%的氢氧化钠溶液18,去离子水适量,硬脂酰胺2,环氧稀释剂4,滑石粉4,铁红3,有机膨润土6。
具体步骤如下:
(1)凹凸棒土改性的腰果酚:
①、将凹凸棒土加入到KH550的水溶液中,用1mol/L盐酸溶液调节pH至3.5,常温搅拌处理16小时,之后用去离子水洗涤,2000r/min离心,真空干燥,粉碎,过200目筛,备用;
②、将腰果酚、苄基三乙基氯化铵以及改性处理后的凹凸棒土加入反应瓶中,在80℃条件下恒温搅拌4小时,冷却至60℃,加入30%的氢氧化钠溶液,在条件下恒温搅拌3小时,冷却至室温,洗涤至中性,分离浓缩,得到凹凸棒土改性的腰果酚;
(2)改性腰果酚醛胺固化剂的制备:
将装有电动搅拌器、冷凝管的四口烧瓶置于40℃恒温水浴中,加入步骤(1)制备的凹凸棒土改性的腰果酚,边搅拌边滴加异佛尔酮二胺,再加入甲醛溶液搅拌均匀,水浴锅升温95℃,恒温反应3小时,降温至70℃,控制压力在0.0095MPa进行减压蒸馏,制得改性腰果酚醛胺固化剂;
(3)A组分制备:
①、先将部分步骤(2)得到的改性腰果酚醛胺固化剂与消泡剂、水预混,之后加入铁黑、沉淀硫酸钡、滑石粉,经砂磨机研磨至细度小于30μm,制得色浆;
②、在搅拌状态下,向色浆中加入剩余的改性腰果酚醛胺固化剂、硬脂酰胺,搅拌15-30分钟,过滤即得组分A;
(4)将环氧树脂、环氧稀释剂混合充分后,作为组分B单独包装。
其中,步骤(1)所述的KH550的水溶液浓度为5%。
性能测试结果:
附着力:1级;柔韧性:2mm;耐盐雾性/h:>500;耐汽油性:200h涂层完好。

Claims (3)

1. 一种钢结构用低表面处理水性环氧底漆,其特征在于,由以下重量份的原料组成:环氧树脂50-70份,腰果酚16-21份,甲醛溶液14-23份,异氟尔酮二胺18-25份,KH550 2-4份,凹凸棒土3-8份,1mol/L盐酸溶液适量,苄基三乙基氯化铵0.6-1.5份,30%的氢氧化钠溶液15-20份,去离子水适量,硬脂酰胺1-2份,环氧稀释剂1-5份,滑石粉3-6份,铁红2-5份,有机膨润土4-8份。
2.根据权利要求书1所述的一种钢结构用低表面处理水性环氧底漆的制备方法,其特征在于,具体步骤如下:
(1)凹凸棒土改性的腰果酚:
①、将凹凸棒土加入到KH550的水溶液中,用1mol/L盐酸溶液调节pH至3-4,常温搅拌处理12-18小时,之后用去离子水洗涤,1500-2500r/min离心,真空干燥,粉碎,过100-200目筛,备用;
②、将腰果酚、苄基三乙基氯化铵以及改性处理后的凹凸棒土加入反应瓶中,在70-90℃条件下恒温搅拌3-5小时,冷却至50-70℃,加入30%的氢氧化钠溶液,在条件下恒温搅拌2-4小时,冷却至室温,洗涤至中性,分离浓缩,得到凹凸棒土改性的腰果酚;
(2)改性腰果酚醛胺固化剂的制备:
将装有电动搅拌器、冷凝管的四口烧瓶置于30-50℃恒温水浴中,加入步骤(1)制备的凹凸棒土改性的腰果酚,边搅拌边滴加异佛尔酮二胺,再加入甲醛溶液搅拌均匀,水浴锅升温90-100℃,恒温反应2-4小时,降温至60-75℃,控制压力在0.0085-0.0095MPa进行减压蒸馏,制得改性腰果酚醛胺固化剂;
(3)A组分制备:
①、先将部分步骤(2)得到的改性腰果酚醛胺固化剂与消泡剂、水预混,之后加入铁黑、沉淀硫酸钡、滑石粉,经砂磨机研磨至细度小于30μm,制得色浆;
②、在搅拌状态下,向色浆中加入剩余的改性腰果酚醛胺固化剂、硬脂酰胺,搅拌15-30分钟,过滤即得组分A;
(4)将环氧树脂、环氧稀释剂混合充分后,作为组分B单独包装。
3.根据权利要求书2所述的一种钢结构用低表面处理水性环氧底漆的制备方法,其特征在于,步骤(1)所述的KH550的水溶液浓度为5%。
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