CN106752847A - 一种多彩沥青路面太阳热反射涂层及其制备方法 - Google Patents
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Abstract
本发明公开一种多彩沥青路面太阳热反射涂层,由以下重量份的原料组成:甲苯二异氰酸酯40‑60份,聚醚二元醇16‑35份,环氧树脂12‑20份,1,4‑二丁醇3‑7份,二羟甲基丙酸3‑6份,二乙胺2‑5份,N‑甲基吡咯烷酮适量,丙酮适量,纳米二氧化钛3‑9份,三乙醇胺1‑3份,去离子水适量,三乙胺3‑8份,氧化铁红1‑3份,氧化铬绿1‑2份,聚羟酸铵盐0.4‑1份。本发明将纳米二氧化钛接枝在聚氨酯预聚体上,之后与开环环氧树脂反应得到二氧化钛接枝聚氨酯‑环氧树脂复合乳液,形成很强的交联结构,大大提高涂层的耐水、耐溶剂性能,同时制备的热反射涂层的折光率明显提高,吸收率减小,对路面的降温效果显著。
Description
技术领域
本发明涉及水性聚氨酯涂层,具体为一种多彩沥青路面太阳热反射涂层及其制备方法。
背景技术
随着我国城镇化进程加快,道路设施的建设水平较以往有很大的改善。相对于水泥混凝土路面,沥青路面维修方便,施工周期短,易养护,因此被越来越广泛地应用于新建或改造道路。沥青是一种吸热材料,它对太阳光辐射的吸收率很高,达0.85-0.95,在夏季会造成路面温度远远高于气温,由此引发严重的车辙危害,同时也加剧城市的热岛效应。
在沥青路面涂布一层热反射率高的物质,能有效提高路面的反射率,并降低吸收率,可有效降低沥青路面的温度,以解决沥青路面热稳性损害以及缓解城市热岛效应。常用的丙烯酸树脂、聚氨酯树脂、有机硅树脂、环氧树脂等不仅透明度高,且折光指数一般都在1.45-1.50之间,满足路用热反射涂料的应用要求。
龚立祝、张旭东等人在其《封闭型聚氨酯-环氧树脂复合乳液的合成与防腐性能研究》一文中,先对双酚A型环氧树脂开环,将环氧基转化为羟基,消除环氧基对乳液稳定性的影响;然后用甲乙酮肟(MEKO)封闭聚氨酯预聚体的部分端-NCO基团,再将环氧树脂接枝到聚氨酯分子链中,大幅提高环氧树脂的改性用量,明显改善聚氨酯乳液的稳定性。环氧树脂改性水性聚氨酯能够对涂膜的机械性能和硬度给予充分的提升,具有非常好的耐溶剂性能以及极好的耐水性。
但对于路用热反射涂料仅树脂的使用对路面的降温效果影响较小,因此,本发明在水性聚氨酯涂料中添加二氧化钛,使得涂料折光指数增大,吸收率减小,涂层的降温效果明显。
发明内容
针对现有技术的不足,本发明提供一种多彩沥青路面太阳热反射涂层及其制备方法。
一种多彩沥青路面太阳热反射涂层,由以下重量份的原料组成:甲苯二异氰酸酯40-60份,聚醚二元醇16-35份,环氧树脂12-20份,1,4-二丁醇3-7份,二羟甲基丙酸3-6份,二乙胺2-5份,N-甲基吡咯烷酮适量,丙酮适量,纳米二氧化钛3-9份,三乙醇胺1-3份,去离子水适量,三乙胺3-8份,氧化铁红1-3份,氧化铬绿1-2份,聚羟酸铵盐0.4-1份。
具体步骤如下:
(1)纳米二氧化钛的表面修饰:
将纳米二氧化钛在超声波作用下分散在去离子水中,然后在搅拌情况下加入三乙醇胺,调节pH值在7-9之间,在高速行星式球磨机中球磨2-3小时,即得纳米二氧化钛的水性分散浆,备用;
(2)环氧树脂开环:
在装有搅样器、冷凝回流管和温度计的四口烧瓶中加入环氧树脂和N-甲基吡咯烷酮与丙酮的混合溶剂(质量比1:1),完全溶解后在30分钟内滴加二乙胺,升温至60-70℃继续反应5-7小时,真空下抽除多余的二乙胺,冷却出料,备用;
(3)端-NCO基聚氨酯预聚体反应液的制备:
在装有搅拌器、冷凝回流管和温度计的四口烧瓶中加入甲苯二异氰酸酯和聚醚二元醇,70-80℃下反应1-3小时,降温至65-70℃下逐步与1,4-二丁醇、二羟甲基丙酸反应2-4小时,制得端-NCO基聚氨酯预聚体反应液;
(4)二氧化钛接枝聚氨酯-环氧树脂复合乳液:
①、向上述聚氨酯预聚体反应液中加入步骤(2)纳米二氧化钛的水性分散浆,在水浴温度65-80℃下反应25-40分钟,将二氧化钛接枝在聚氨酯预聚体上;
②、之后加入步骤(1)已开环的环氧树脂,在60-70℃下与剩余的-NCO基完全反应,降温至40℃以下,加入丙酮稀释降低粘度,再加入三乙胺中和搅拌15-25分钟,得到二氧化钛接枝聚氨酯-环氧树脂复合乳液;
(5)将氧化铁红、氧化铬绿混合研磨过100-200目筛,之后将混合物加入去离子水中,再加入聚羟酸铵盐,超声分散20-40分钟,得到混合着色颜料;
(6)将步骤(4)复合乳液蒸馏脱除有机溶剂,加入步骤(5)混合着色颜料,之后加入去离子水调节粘度至60000cps/25℃,在7000-8000rpm强剪切下搅拌至均匀,封装得一种多彩沥青路面太阳热反射涂层。
与现有技术相比,本发明具有以下优点:
(1)本发明使用多羟基化合物三乙醇胺为桥基,对纳米二氧化钛表面进行修饰,增加纳米二氧化钛粒子表面的-OH,之后与聚氨酯预聚体上的-NCO基团反应,将纳米二氧化钛接枝在聚氨酯预聚体上,一方面提高了二氧化钛粒子在涂层基料中的分散性,不易发生团聚现象,另一方面纳米二氧化钛可作为封闭剂使用,对聚氨酯预聚体上的-NCO基团进行部分封端,使其不能参与反应,在高温下可解封将-NCO基团释放出来,与环氧树脂上剩余的-OH基团完全反应,进一步形成交联结构,大大提高涂层的耐水、耐溶剂性能,同时制备的热反射涂层的折光率明显提高,吸收率减小,对路面的降温效果显著。
(2)本发明先对环氧树脂进行开环处理,一个环氧基转化为了三个羟基,之后与聚氨酯预聚体反应形成聚氨酯-环氧树脂复合乳液,形成很强的交联结构,提高路面涂层的耐水性能、抵抗水破坏的能力,提高涂层的使用寿命,同时环氧树脂的引入充分提升涂层的机械性能与耐久性,且本发明涂层中无有机溶剂,对环境无污染。
(3)本发明中添加氧化铁红、氧化铬绿作为着色颜料,与二氧化钛组合作用使多彩粒子达到很高的太阳光反射比,可减少沥青路面的吸热量、缓解城市“热岛效应”、美化道路景观,提高热反射涂层的使用寿命。
具体实施方式
一种多彩沥青路面太阳热反射涂层,由以下重量份的原料组成:甲苯二异氰酸酯55份,聚醚二元醇26份,环氧树脂15份,1,4-二丁醇6份,二羟甲基丙酸5份,二乙胺4,N-甲基吡咯烷酮适量,丙酮适量,纳米二氧化钛8份,三乙醇胺2份,去离子水适量,三乙胺6份,氧化铁红3,氧化铬绿2,聚羟酸铵盐0.8。
具体步骤如下:
(1)纳米二氧化钛的表面修饰:
将纳米二氧化钛在超声波作用下分散在去离子水中,然后在搅拌情况下加入三乙醇胺,调节pH值在8之间,在高速行星式球磨机中球磨2小时,即得纳米二氧化钛的水性分散浆,备用;
(2)环氧树脂开环:
在装有搅样器、冷凝回流管和温度计的四口烧瓶中加入环氧树脂和N-甲基吡咯烷酮与丙酮的混合溶剂(质量比1:1),完全溶解后在30分钟内滴加二乙胺,升温至65℃继续反应6小时,真空下抽除多余的二乙胺,冷却出料,备用;
(3)端-NCO基聚氨酯预聚体反应液的制备:
在装有搅拌器、冷凝回流管和温度计的四口烧瓶中加入甲苯二异氰酸酯和聚醚二元醇,75℃下反应1-3小时,降温至70℃下逐步与1,4-二丁醇、二羟甲基丙酸反应3小时,制得端-NCO基聚氨酯预聚体反应液;
(4)二氧化钛接枝聚氨酯-环氧树脂复合乳液:
①、向上述聚氨酯预聚体反应液中加入步骤(2)纳米二氧化钛的水性分散浆,在水浴温度75℃下反应35分钟,将二氧化钛接枝在聚氨酯预聚体上;
②、之后加入步骤(1)已开环的环氧树脂,在65℃下与剩余的-NCO基完全反应,降温至40℃以下,加入丙酮稀释降低粘度,再加入三乙胺中和搅拌20分钟,得到二氧化钛接枝聚氨酯-环氧树脂复合乳液;
(5)将氧化铁红、氧化铬绿混合研磨过200目筛,之后将混合物加入去离子水中,再加入聚羟酸铵盐,超声分散20-40分钟,得到混合着色颜料;
(6)将步骤(4)复合乳液蒸馏脱除有机溶剂,加入步骤(5)混合着色颜料,之后加入去离子水调节粘度至60000cps/25℃,在8000rpm强剪切下搅拌至均匀,封装得一种多彩沥青路面太阳热反射涂层。
按照具体实施例制备的热反射涂层,对其进行性能测试,结果如下:
粘附性能测试:拉拔强度0.55Mp;
测试涂层在太阳光照下的降温效果,结果表明在夏季高温时,涂层的表面降温极限可达13-19℃;
耐水性测试:热反射涂层在水中浸泡7天后,并无发白、失光、起泡、脱落等现象发生;
耐磨性测试:经18个月车辆轮胎的不断磨损后,沥青路面太阳热反射涂层面积还保留80%以上。
Claims (2)
1.一种多彩沥青路面太阳热反射涂层,其特征在于,由以下重量份的原料组成:甲苯二异氰酸酯40-60份,聚醚二元醇16-35份,环氧树脂12-20份,1,4-二丁醇3-7份,二羟甲基丙酸3-6份,二乙胺2-5份,N-甲基吡咯烷酮适量,丙酮适量,纳米二氧化钛3-9份,三乙醇胺1-3份,去离子水适量,三乙胺3-8份,氧化铁红1-3份,氧化铬绿1-2份,聚羟酸铵盐0.4-1份。
2.根据权利要求书1所述的一种多彩沥青路面太阳热反射涂层的制备方法,其特征在于,具体步骤如下:
(1)纳米二氧化钛的表面修饰:
将纳米二氧化钛在超声波作用下分散在去离子水中,然后在搅拌情况下加入三乙醇胺,调节pH值在7-9之间,在高速行星式球磨机中球磨2-3小时,即得纳米二氧化钛的水性分散浆,备用;
(2)环氧树脂开环:
在装有搅样器、冷凝回流管和温度计的四口烧瓶中加入环氧树脂和N-甲基吡咯烷酮与丙酮的混合溶剂(质量比1:1),完全溶解后在30分钟内滴加二乙胺,升温至60-70℃继续反应5-7小时,真空下抽除多余的二乙胺,冷却出料,备用;
(3)端-NCO基聚氨酯预聚体反应液的制备:
在装有搅拌器、冷凝回流管和温度计的四口烧瓶中加入甲苯二异氰酸酯和聚醚二元醇,70-80℃下反应1-3小时,降温至65-70℃下逐步与1,4-二丁醇、二羟甲基丙酸反应2-4小时,制得端-NCO基聚氨酯预聚体反应液;
(4)二氧化钛接枝聚氨酯-环氧树脂复合乳液:
①、向上述聚氨酯预聚体反应液中加入步骤(2)纳米二氧化钛的水性分散浆,在水浴温度65-80℃下反应25-40分钟,将二氧化钛接枝在聚氨酯预聚体上;
②、之后加入步骤(1)已开环的环氧树脂,在60-70℃下与剩余的-NCO基完全反应,降温至40℃以下,加入丙酮稀释降低粘度,再加入三乙胺中和搅拌15-25分钟,得到二氧化钛接枝聚氨酯-环氧树脂复合乳液;
(5)将氧化铁红、氧化铬绿混合研磨过100-200目筛,之后将混合物加入去离子水中,再加入聚羟酸铵盐,超声分散20-40分钟,得到混合着色颜料;
(6)将步骤(4)复合乳液蒸馏脱除有机溶剂,加入步骤(5)混合着色颜料,之后加入去离子水调节粘度至60000cps/25℃,在7000-8000rpm强剪切下搅拌至均匀,封装得一种多彩沥青路面太阳热反射涂层。
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