CN108395812B - 焦磷酸三聚氰胺-蛭石固化制备高交联环氧底漆的方法 - Google Patents
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Abstract
本发明公开了一种焦磷酸三聚氰胺‑蛭石固化制备高交联环氧底漆的方法,属于涂料化工技术领域。本发明的环氧固化剂由以下工艺制得:先将焦磷酸三聚氰胺溶解于由乙醇、正丁醇、醋酸丁酯组成的混合溶剂中,配制成混合液;再将蛭石矿粉和高岭土添加到上述混合液中,在30~50℃下搅拌5~6小时,研磨至80µm以下即得。该固化体系是一个双分子反应机理,因含给质子基团焦磷酸上的氢与环氧基上的氧形成氢键,使环氧基极化,有利于三聚氰胺上的N背面进攻,完成开环,从而使环氧树脂交联固化,提高了环氧底漆耐磨性、耐水性、抗冲击性等各项性能。
Description
技术领域
本发明涉及一种超支化环氧底漆的制备方法,尤其涉及一种焦磷酸三聚氰胺-蛭石固化制备高交联超支化环氧底漆的方法,属于涂料化工技术领域。
背景技术
超支化环氧树脂是一种具有低粘度、高环氧值、高活性、低voc的高分子量环氧树脂,可作为环氧树脂、环硫树脂等热固性树脂的稀释剂、增强增韧助剂;也可作为牙科修复材料、灌封涂料、电子封装涂料增强增韧助剂、消泡剂;也可作为合成其他功能高分子材料的中间体,应用于航空航天等高端领域的涂 料、热固性塑料、胶黏剂等。在超支化环氧环氧树脂的制备中,环氧固化剂起着决定性的作用。环氧固化剂的选择会直接影响超支化环氧树脂的固化速度、交联密度,从而影响超支化环氧树脂的各项性能。
发明内容
本发明的目的是提供一种焦磷酸三聚氰胺-蛭石固化制备高交联环氧底漆的方法。
一、环氧底漆的制备
本发明超支化高交联环氧底漆的制备方法,包括以下工艺步骤:
(1)环氧固化剂的制备
先将焦磷酸三聚氰胺溶解于由乙醇、正丁醇、醋酸丁酯组成的混合溶剂中,配制成混合液;再将蛭石矿粉和高岭土添加到上述混合液中,在30~50℃下搅拌5~6小时,研磨至80µm以下,得到环氧固化剂;
所述混合溶剂中,乙醇、正丁醇、醋酸丁酯的体积比为1:1:1~5:5:1;混合液中焦磷酸三聚氰胺的浓度为0.1~1g/mL;
蛭石矿粉和高岭土的的质量比为1:1~5:1;蛭石矿粉和高岭土以0.5~5g/mL的固液比添加到混合液中。
(2)环氧底漆的制备
组分的制备:将环氧树脂、轻质碳酸钙、氧化铁红、滑石粉、锌黄、混合溶剂进行复配,研磨,制成组分;其中各原料按以下重量份进行配比:环氧树脂20~30份,轻质碳酸钙20~30份,氧化铁红10-15份,滑石粉10-20份,锌黄5~10份,混合溶剂40~60份。混合溶剂由甲苯、丙酮、醋酸乙酯、醋酸丁酯按4:1:1:1~5:2:3:1的质量比混合;
二、环氧底漆的性能
将上述制备的双组份超支化环氧底漆涂刷在贴板上,实干后进行全项性能检测,结果见表1:
表1的结果显示,以蛭石、高岭土等为载体制备的环氧固化剂用于制备环氧底漆,有效提高了涂层的交联密度,从而提高了耐磨性、耐水性、抗冲击性等各项性能。
蛭石,是一种与蒙脱石相似的粘土矿物,无毒片状多层孔材料,由花岗岩水合产生,外形呈块、片状多孔结构,层间水含量取决于层间阳离子水合能力及环境温湿度。高湿度下,单位化学式可含4~5个水分子,游离水分子以氢键与结构层表面的桥氧相联,层间水分子以弱氢键连结,围绕层间阳离子形成配位八面体[Mg(H2O)6]2水合络离子,这种结构特点使蛭石具有较高的层电荷数,很强阳离子交换能力和吸附能力,故具有独特吸附性、催化性、离子交换性,离子选择性、耐酸性、热稳定性等,可做吸附剂、填料,用以制备涂料,尤其是底漆、腻子。高岭土是一种微小片、管、棒、纤维状簇生矿物,颗粒间存在大量微孔和空隙,添加到溶剂体系,具有较高粘性、粘结性、触变性、悬浮性和分散性,同时还具有从周围介质中吸附交换各种离子及杂质的能力,其主要作为增稠剂、触变剂、防尘剂用于制备涂料。本发明选择优质阻燃剂焦磷酸三聚氰胺,并将其溶解于由乙醇、正丁醇、醋酸丁酯组成的混合溶剂中,配制成混合液,再将蛭石矿粉和高岭土添加到上述混合液中,在30~50℃下搅拌,离子化反应5~6小时,利用孔道效应、吸附效应和溶剂化效应,使焦磷酸三聚氰胺能被均匀吸附到蛭石和高岭土的孔道表面,在醇和酯的作用下,依靠氢键和静电力作用,使晶层间距加大,焦磷酸三聚氰胺等物质被吸附,进入插层间,通过氢键桥接,获得有效的溶剂化,从而形成触变性凝胶体,提高涂料防沉性、触变性和固化效率。
负载胺蛭石复合固化剂的固化机理:负载胺固化剂中含焦磷酸三聚氰胺是碱性固化剂。胺的固化机理为亲核加成,每一个活泼氢可以打开一个环氧基团,使之交联固化。在固化体系中含给质子基团的化合物焦磷酸三聚氰胺,更加促进胺类固化,即焦磷酸三聚氰胺是一个双分子反应机理,即给质子体焦磷酸上的氢首先与环氧基上的氧形成氢键,使环氧基进一步极化,有利于三聚氰胺上的N对环氧基的亲核进攻,同时完成氢原子的加成,促进固化;同时,焦磷酸自身也会发生酸固化交联,所进一步加快固化速度,提高了交联密度。如果固化温度是在100±20℃条件下进行,不仅发生环氧开环反应,还会进一步进行羟基间脱水的醚化反应,支化度和交联密度大幅度提高,硬度、冲击、耐水等性能也会随之提高。
负载胺固化剂交联固化的反应式如下:
具体实施方式
下面通过具体实施例对本发明焦磷酸三聚氰胺-蛭石固化制备高交联环氧底漆的方法和性能做进一步说明。
实施例一
1、环氧固化剂的制备
取6g焦磷酸三聚氰胺,加入到20ml 由乙醇、正丁醇、醋酸丁酯配成的混合溶剂(乙醇、正丁醇、醋酸丁酯分别为10ml、5ml,5 ml)中,配成混合液;
称取20g蛭石矿粉、10g高岭土,添加到上述混合液中,在35℃下搅拌5~6小时,研磨至80µm以下,即得复合固化剂。
2、超支化环氧底漆的制备
(1)组分的制备:取环氧树脂20g、轻质碳酸钙20g、氧化铁红10g、滑石粉10g、锌黄5g,溶解于40g混合溶剂,得组分;其中混合溶剂由甲苯、丙酮、醋酸乙酯、醋酸丁酯按4:1:1.5:1的质量比混合而成;
实施例二
1、环氧固化剂的制备
取4g 焦磷酸三聚氰胺,加入到20ml 由乙醇、正丁醇、醋酸丁酯配成的混合溶剂(乙醇、正丁醇、醋酸丁酯分别为5ml、10ml,5 ml)中,配成混合液;
称取15g蛭石矿粉、15g高岭土,添加到上述混合液中,在30℃下搅拌5~6小时,研磨至80µm以下,即得复合固化剂。
2、超支化环氧底漆的制备
其中混合溶剂由甲苯、丙酮、醋酸乙酯、醋酸丁酯按5:2:2.5:1的质量比混合而成。
实施例三
1、环氧固化剂的制备
取8g焦磷酸三聚氰胺,加入到30ml 由乙醇、正丁醇、醋酸丁酯配成的混合溶剂(乙醇、正丁醇、醋酸丁酯分别为20ml、5ml,5 ml)中,配成混合液;
称取12g蛭石矿粉、8g高岭土,添加到上述混合液中,在40℃下搅拌5~6小时,研磨至80µm以下,即得复合固化剂。
2、超支化环氧底漆的制备
Claims (4)
1.一种焦磷酸三聚氰胺-蛭石固化制备高交联环氧底漆的方法,包括以下工艺步骤:
(1)环氧固化剂的制备
先将焦磷酸三聚氰胺溶解于乙醇、正丁醇、醋酸丁酯的混合溶剂中,配制成混合液;再将蛭石矿粉和高岭土添加到上述混合液中,在30~40℃下搅拌5~6小时,研磨至80µm以下,得到环氧固化剂;所述混合溶剂由乙醇、正丁醇、醋酸丁酯按1:1:1~5:5:1的体积比混合;蛭石矿粉和高岭土的的质量比为1:1~5:1;
(2)环氧底漆的制备
组分的制备:将环氧树脂、轻质碳酸钙、氧化铁红、滑石粉、锌黄用混合溶剂进行复配,研磨,制成组分;其中各原料按以下重量份进行配比:环氧树脂20~30份,轻质碳酸钙20~30份,氧化铁红10-15份,滑石粉10-20份,锌黄5~10份,混合溶剂40~60份;
2.如权利要求1所述一种焦磷酸三聚氰胺-蛭石固化制备高交联环氧底漆的方法,其特征在于:环氧固化剂的制备中,混合液中焦磷酸三聚氰胺的浓度为0.1~1g/mL。
3.如权利要求1所述一种焦磷酸三聚氰胺-蛭石固化制备高交联环氧底漆的方法,其特征在于:环氧固化剂的制备中,蛭石矿粉和高岭土以0.5~5g/mL的固液比添加到混合液中。
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CN101786637A (zh) * | 2009-01-23 | 2010-07-28 | 中国科学院宁波材料技术与工程研究所 | 高阻燃性能有机插层层状粘土的材料及其制备方法 |
CN105219215A (zh) * | 2015-09-28 | 2016-01-06 | 洛阳双瑞防腐工程技术有限公司 | 一种工程机械用高性能环氧底漆的制备方法 |
Non-Patent Citations (1)
Title |
---|
Study on Curing Kinetics and Curing Mechanism of Epoxy Resin Based on Diglycidyl Ether of Bisphenol A and Melamine Phosphate;Wen-Yi Chen.etc;《Journal of Applied Polymer Science》;20041231;第29卷;第898-900页中Scheme 2-5 * |
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