CN112831035A - 一种高性能水性醇酸树脂及其制备方法与应用 - Google Patents
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Abstract
本发明提供的一种高性能水性醇酸树脂,本发明还提供了上述高性能水性醇酸树脂的制备方法,还提供了该改性醇酸树脂在醇酸树脂涂料中的应用。本发明提供的水性醇酸树脂利用特殊的单体制得超低VOC、高固含水性醇酸树脂,实现水性涂料高固低黏的技术,突破高固体分溶剂型涂料无法水性化的技术难题,进一步减少VOC排放。
Description
技术领域
本发明涉及涂料材料领域,特别涉及一种高性能水性醇酸树脂及其制备方法与应用。
背景技术
醇酸树脂是由脂肪酸、多元醇及多元酸通过聚酯反应合成的树脂,具有原料易得、性能优良等优点,在涂料工业中应用广泛。随着工业的发展,环境污染问题越来越受到 重视。由于传统溶剂型有机涂料中挥发性有机物(VOC)含量高,在其施工以及干燥的 过程中会释放大量的有机溶剂,对环境及人类的健康造成极大威胁。再加上各国的现行 的环保法规对VOC排放量的规定也越来越严格,因此,减少和控制涂料中的VOC含量, 发展环保型涂料是保护环境的一项必要举措。
通常要降低涂料的VOC含量有以下几种方法:发展高固体份溶剂型涂料;开发无溶剂粉末涂料;发展水性涂料,以水取代全部或大部分有机溶剂。其中水性涂料是目前 最实际有效的办法。而要发展水性涂料,首先就要实现涂料中成膜物质的水性化,也就 是发展能够以水稀释的树脂水性树脂。目前,国内水性醇酸及其涂料的发展已经得到了 很大的进步,但是与国外的技术水平相比依然存在较大差距。因此,改进已有的合成方 法并开发新工艺,利用国内现有原料生产出适合中价廉物美的水性醇酸树脂,对我国涂 料工业的发展意义重大。
虽然与传统溶剂型醇酸树脂相比,水性醇酸树脂满足了当今社会环保低害的要求, 但是其发展却相对缓慢。其主要原因是水性体系与溶剂型体系相比,具有其独特的性能,这决定了水性醇酸树脂的生产必然存在许多问题:(1)水的蒸发潜热大,延长了漆 膜的干燥时间;(2)水的表面张力大,对颜料的分散和涂布性能等造成不利影响,耐沾 污性能也相对较差;(3)对涂覆的材质有一定的限制,较难应用在对水敏感的基材上; (4)水性醇酸树脂一般需要经过加胺中和成盐后才具有水溶性,因此通常呈弱碱性, pH约等于7.5~8.0,而树脂中的酯键在碱性条件下容易发生水解,从而影响涂料的贮存 稳定性及其他涂膜性能;(5)分子链中过多的亲水性基团会增加涂膜的吸水率,影响耐 水性,缩短漆膜的使用寿命。
要解决这些问题,在不影响水分散性能及乳液稳定性的同时,改善水性醇酸树脂的 干燥性能、贮存稳定性、耐水性以及耐沾污性等,还需要对醇酸树脂进行改性。通过引入环氧树脂、丙烯酸树脂、聚氨酯等具有特殊结构的树脂,可在一定程度上提高水性醇 酸树脂的性能。然而,目前醇酸树脂的性能仍有进一步提高的需求。
发明内容
技术问题:为了解决现有技术的缺陷,本发明提供了一种高性能水性醇酸树脂及其 制备方法与应用。
技术方案:本发明提供的一种高性能水性醇酸树脂,其结构式如式I或式II所示:
本发明还提供了上述高性能水性醇酸树脂的制备方法,包括以下步骤:
(1)蓖麻油酸、过量的三羟甲基丙烷、过量的4,5-二甲氧基邻苯甲酸酐聚合 反应,即得;反应式如下:
(2)在BBr3存在下,式(I)所示的化合物脱甲氧基,得到式(II)所示的化合物; 反应式如下:
优选地,步骤(1)具体为:蓖麻油酸、三羟甲基丙烷、催化剂、溶剂投入到 装有分水器、温度计及搅拌的三口烧瓶中,升温至210℃保持1h,继续升温至 230-245℃,保持酸值低于8mg KOH/g,降温至145℃以下,再加入4,5-二甲氧基 邻苯甲酸酐,升温至175℃,反应至酸值41-45mg KOH/g,降温,抽真空去除溶 剂,即得。
更优选地,蓖麻油酸、三羟甲基丙烷、4,5-二甲氧基邻苯甲酸酐的摩尔比为1: (2-3):(2-3)。
优选地,步骤(2)具体为:在-83℃至0℃下,氮气保护下,逐滴加入BBr3, 从滴加开始至反应完毕时间为1-2h,即得。
更优选地,步骤(2)中,反应温度在0℃以下,优选-83℃至0℃,更优选-20℃ 至-10℃,反应时间为1-2h。
本发明还提供了上述高性能水性醇酸树脂在醇酸树脂涂料中的应用。
有益效果:本发明提供的水性醇酸树脂利用特殊的单体制得超低VOC、高固含水性醇酸树脂,实现水性涂料高固低黏的技术,突破高固体分溶剂型涂料无法水性化的技术 难题,进一步减少VOC排放。
附图说明
图1为式(I)所示的化合物的氢谱图。
图2为式(II)所示的化合物的氢谱图。
具体实施方式
下面对本发明作出进一步说明。
实施例1
高性能水性醇酸树脂的制备方法,包括以下步骤:
(1)蓖麻油酸、三羟甲基丙烷、催化剂、溶剂投入到装有分水器、温度计及 搅拌的三口烧瓶中,升温至210℃保持1h,继续升温至245℃,保持酸值低于8mg KOH/g,降温至145℃以下,再加入4,5-二甲氧基邻苯甲酸酐,升温至175℃,反 应至酸值41-45mg KOH/g,降温,抽真空去除溶剂,即得式(I)所示的化合物; 蓖麻油酸、三羟甲基丙烷、4,5-二甲氧基邻苯甲酸酐的摩尔比为1:2:3;
得反应产物249.6g,m/z=842.45,氢谱见图1。
(2)在0℃下,氮气保护下,逐滴加入BBr3,从滴加开始至反应完毕时间为 1h,即得式(II)所示的化合物。
得反应产物210.3g,m/z=800.43,氢谱见图2。
实施例2
高性能水性醇酸树脂的制备方法,包括以下步骤:
(1)蓖麻油酸、三羟甲基丙烷、催化剂、溶剂投入到装有分水器、温度计及 搅拌的三口烧瓶中,升温至210℃保持1h,继续升温至230℃,保持酸值低于8mg KOH/g,降温至145℃以下,再加入4,5-二甲氧基邻苯甲酸酐,升温至175℃,反 应至酸值41-45mg KOH/g,降温,抽真空去除溶剂,即得式(I)所示的化合物; 蓖麻油酸、三羟甲基丙烷、4,5-二甲氧基邻苯甲酸酐的摩尔比为1:3:2;
得反应产物198.6g。
(2)在-10℃下,氮气保护下,逐滴加入BBr3,从滴加开始至反应完毕时间 为2h,即得式(II)所示的化合物。
得反应产物176.3g。
实施例3
高性能水性醇酸树脂的制备方法,包括以下步骤:
(1)蓖麻油酸、三羟甲基丙烷、催化剂、溶剂投入到装有分水器、温度计及 搅拌的三口烧瓶中,升温至210℃保持1h,继续升温至240℃,保持酸值低于8mg KOH/g,降温至145℃以下,再加入4,5-二甲氧基邻苯甲酸酐,升温至175℃,反 应至酸值41-45mg KOH/g,降温,抽真空去除溶剂,即得式(I)所示的化合物; 蓖麻油酸、三羟甲基丙烷、4,5-二甲氧基邻苯甲酸酐的摩尔比为1:2.5:2.5;
得反应产物295.3g。
(2)在-20℃下,氮气保护下,逐滴加入BBr3,从滴加开始至反应完毕时间 为1.5h,即得式(II)所示的化合物。
得反应产物267.4g。
实施例4高固含水性醇酸树脂涂料的制备
制得一批水性醇酸树脂涂料,其配方如下表。
测试上述水性醇酸树脂涂料的性能,结果见下表。
样品1 | 样品2 | 样品3 | 对比例1 | 对比例2 | 对比例3 | |
外观(目测) | 透明 | 透明 | 透明 | 透明 | 透明 | 透明 |
色泽(Fe-C0) | 10 | 10 | 10 | 10 | 10 | 10 |
不挥发份(%) | 84 | 80 | 82 | 71 | 67 | 73 |
粘度(涂-4杯,s) | 20 | 24 | 26 | 142 | 167 | 48 |
酸值mg KOH/g | ≤12 | ≤12 | ≤12 | ≤12 | ≤12 | ≤12 |
表干25℃(h) | 1.5 | 1.5 | 1.5 | 6 | 6 | 1.5 |
实干25℃(h) | 5 | 5.5 | 5.5 | 18 | 18 | 5.5 |
硬度(摆杆) | 0.5 | 0.5 | 0.5 | 0.2 | 0.25 | 0.5 |
一次涂膜厚度 | 161 | 147 | 149 | 112 | 101 | 121 |
VOC | 97 | 99 | 98 | 156 | 167 | 107 |
Claims (7)
3.根据权利要求2所述的一种高性能水性醇酸树脂的制备方法,其特征在于:步骤(1)具体为:蓖麻油酸、三羟甲基丙烷、催化剂、溶剂投入到装有分水器、温度计及搅拌的三口烧瓶中,升温至210℃保持1h,继续升温至230-245℃,保持酸值低于8mg KOH/g,降温至145℃以下,再加入4,5-二甲氧基邻苯甲酸酐,升温至175℃,反应至酸值41-45mg KOH/g,降温,抽真空去除溶剂,即得。
4.根据权利要求2所述的一种高性能水性醇酸树脂的制备方法,其特征在于:蓖麻油酸、三羟甲基丙烷、4,5-二甲氧基邻苯甲酸酐的摩尔比为1:(2-3):(2-3)。
5.根据权利要求2所述的一种高性能水性醇酸树脂的制备方法,其特征在于:步骤(2)具体为:在-83℃至0℃下,氮气保护下,逐滴加入BBr3,从滴加开始至反应完毕时间为1-2h,即得。
6.根据权利要求2所述的一种高性能水性醇酸树脂的制备方法,其特征在于:步骤(2)中,反应温度在0℃以下,优选-83℃至0℃,更优选-20℃至-10℃,反应时间为1-2h。
7.权利要求1所述的高性能水性醇酸树脂在醇酸树脂涂料中的应用。
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