CN106190511B - 一种光催化混凝土脱模剂及其制备方法 - Google Patents
一种光催化混凝土脱模剂及其制备方法 Download PDFInfo
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Abstract
本发明涉及一种光催化混凝土脱模剂及其制备方法,制备该脱模剂的原材料包括以下重量百分含量的材料组分:动物油脂2~5%、硬脂酸3~6%、机油1~3%、氢氧化钠0.1~2%、磷酸三丁酯0.1~0.3%、聚羧酸减水剂0.1~1%、聚合硫酸铁0.1~0.5%、蒙脱石负载纳米TiO2光催化剂10~20%,余量为水。本发明制备的光催化混凝土脱模剂脱模效果好,并且具有良好的光催化性能,可有效降解空气污染物,并且制备成本低。另外,本发明提供的光催化混凝土脱模剂的制备方法工艺简单,反应条件温和,适于工业推广。
Description
技术领域
本发明属于建筑材料技术领域,涉及一种光催化混凝土脱模剂及其制备方法。
背景技术
光催化剂在光的刺激下发挥其光催化的作用,利用电子跃迁所得到的自由基,可将大量存在的有害物质如小分子氮氧化物以及有机污染物如汽车尾气中燃烧不完全的物质反应或降解,转换为环境安全物质。因为光催化剂所需紫外线强度不大,所以只要在室外光催化反应就会发生。现阶段空气污染问题日益严峻,考虑到大量混凝土结构建筑的墙体表面与空气接触,且接触面积较大,可将墙体表面附着一层光催化剂,起到空气净化的作用。
本发明将光催化剂与混凝土脱模剂相结合,制备出一种光催化型混凝土脱模剂涂抹在混凝土模板上,既达到脱模目的,又可使光催化剂大量粘附在混凝土结构表面,达到净化空气的作用。
发明内容
本发明所要解决的技术问题是针对现有技术中存在的上述不足,提供一种对混凝土构件脱模效果好、同时可以在混凝土构件表面附着一层光催化剂的光催化混凝土脱模剂及其制备方法,该光催化混凝土脱模剂能够起到脱模和光催化降解空气污染物(如甲醛、氮氧化物、硫化物等)的双重功效,并且所得混凝土表面光洁。
为解决上述技术问题,本发明提供的技术方案是:
提供一种光催化混凝土脱模剂,制备该脱模剂的原材料包括以下重量百分含量的材料组分:动物油脂2~5%、硬脂酸3~6%、机油1~3%、氢氧化钠0.1~2%、磷酸三丁酯0.1~0.3%、聚羧酸减水剂0.1~1%、聚合硫酸铁0.1~0.5%、蒙脱石负载纳米TiO2光催化剂10~20%,余量为水。
按上述方案,所述动物油脂包括猪油、羊油、牛油、鲸油、鱼油中的一种或多种。
按上述方案,所述聚羧酸减水剂分子结构式如下:
其中m:n=1:1.5,n=1-50,k=48-52。
按上述方案,所述蒙脱石负载纳米TiO2光催化剂的制备方法为:将钠蒙脱石、柱撑剂、去离子水按照质量比1:1:10混合,搅拌均匀后微波加热处理3~5min,随后过滤,将滤渣洗涤至洗涤液中无Br-,然后烘干、研磨、过200目筛得到柱撑蒙脱石,将所得柱撑蒙脱石用乙醇配制成悬浮液,向该悬浮液中逐滴加入钛酸乙酯的乙醇溶液,其中柱撑蒙脱石与酞酸丁酯的质量比为1:3,搅拌反应6~8h,再陈化3~6h,之后过滤,向所得滤渣中逐滴加入蒸馏水,使得滤渣完全悬浮在水中即可,搅拌均匀,水解陈化24h,然后经过滤、干燥、研磨,得到水合氧化钛/蒙脱石复合物,将水合氧化钛/蒙脱石复合物在400~450℃下加热3~5h,再研磨、过200目筛得到蒙脱石负载纳米TiO2光催化剂。
本发明所述机油为提炼石油过程中产生的矿物油或者合成机油。
本发明还提供上述光催化混凝土脱模剂的制备方法,其步骤如下:
a.将动物油脂、硬脂酸加入反应釜,开动搅拌器搅拌,并加热至80-105℃使之全部溶解后,加入机油和磷酸三丁酯搅拌均匀;
b.向反应釜中加入氢氧化钠,搅拌20min进行皂化反应,再加入水搅拌30min;
c.进一步向反应釜中加入蒙脱石负载纳米TiO2光催化剂,搅拌5min;
d.向反应釜中加入聚羧酸减水剂、聚合硫酸铁并搅拌20min,冷却得到光催化混凝土脱模剂。
本发明的有益效果在于:本发明制备的光催化混凝土脱模剂脱模效果好,并且具有良好的光催化性能,可有效降解空气污染物,并且制备成本低。本发明将脱模剂与光催化剂结合应用,涂抹在混凝土结构表面,达到脱模和光催化降解空气污染物的双重功效,符合材料绿色发展的理念。另外,本发明提供的光催化混凝土脱模剂的制备方法工艺简单,反应条件温和,适于工业推广。
具体实施方式
为使本领域技术人员更好地理解本发明的技术方案,下面结合实施例对本发明作进一步详细描述。
本发明实施例所用蒙脱石负载纳米TiO2光催化剂的制备方法为:将50g蒙脱石、50g柱撑剂、500g去离子水混合,搅拌均匀后微波加热处理3~5min,随后过滤,将滤渣洗涤至洗涤液中无Br-,然后烘干、研磨、过200目筛得到柱撑蒙脱石,将所得柱撑蒙脱石用乙醇配制成悬浮液,向该悬浮液中逐滴加入钛酸乙酯的乙醇溶液(其中,钛酸丁酯的加入量为150g),搅拌反应6~8h,再陈化3~6h,之后过滤,向所得滤渣中逐滴加入蒸馏水,使得滤渣完全悬浮在水中即可,搅拌均匀,水解陈化24h,然后经过滤、干燥、研磨,得到水合氧化钛/蒙脱石复合物,将水合氧化钛/蒙脱石复合物在400~450℃下加热3-5h,再研磨、过200目筛得到蒙脱石负载纳米TiO2光催化剂。
实施例1
制备光催化混凝土脱模剂,所用原料及其质量百分含量为:鱼油2%、硬脂酸3%、机油1%、氢氧化钠0.1%、磷酸三丁酯0.1%、聚羧酸减水剂0.1%、聚合硫酸铁0.1%、蒙脱石负载纳米TiO2光催化剂10%、水83.6%。
本实施例所用聚羧酸减水剂分子结构式如下:
其中,m=30,n=45,k=50。
具体制备方法如下:
a.将鱼油、硬脂酸加入反应釜,开动搅拌器搅拌,并加热至80-105℃使之全部溶解后,加入市售合成机油和磷酸三丁酯搅拌均匀;
b.向反应釜中加入氢氧化钠,搅拌20min进行皂化反应,再加入水搅拌30min;
c.进一步向反应釜中加入蒙脱石负载纳米TiO2光催化剂,搅拌5min;
d.向反应釜中加入聚羧酸减水剂、聚合硫酸铁并搅拌20min,冷却得到光催化混凝土脱模剂。
实施例2
制备光催化混凝土脱模剂,所用原料及其质量百分含量为:猪油2.5%、硬脂酸3.5%、机油1.58%、氢氧化钠0.5%、磷酸三丁酯0.5%、聚羧酸减水剂0.5%、聚合硫酸铁0.3%、蒙脱石负载纳米TiO2光催化剂12%、水78.62%。
制备方法与实施例1相同。
实施例3
制备光催化混凝土脱模剂,所用原料及其质量百分含量为:羊油5%、硬脂酸3%、机油1%、氢氧化钠0.5%、磷酸三丁酯0.3%、聚羧酸减水剂0.5%、聚合硫酸铁0.15%、蒙脱石负载纳米TiO2光催化剂10%、水79.55%。
制备方法与实施例1相同。
实施例4
制备光催化混凝土脱模剂,所用原料及其质量百分含量为:猪油3.55%、硬脂酸6%、机油1.32%、氢氧化钠2%、磷酸三丁酯0.3%、聚羧酸减水剂0.5%、聚合硫酸铁0.5%、蒙脱石负载纳米TiO2光催化剂15%、水70.83%。
制备方法与实施例1相同。
实施例5
制备光催化混凝土脱模剂,所用原料及其质量百分含量为:猪油2.5%、硬脂酸1.5%、机油1%、氢氧化钠1%、磷酸三丁酯0.2%、聚羧酸减水剂1%、聚合硫酸铁0.5%、蒙脱石负载纳米TiO2光催化剂20%、水72.3%。
制备方法与实施例1相同。
实施例6
测试实施例1-5所制备的光催化混凝土脱模剂的光催化效果:通过光催化反应器来检验,以NO2的降解率来表征光催化混凝土脱模剂的光催化效果。试验采用自制的流通管式光催化反应器,反应器材料为对紫外光透过性较好的耐热玻璃。圆柱形反应器的长度为500mm,内径为60mm,总体积为1413mL。试验选择黑光灯为光催化反应的紫外光源。试验所用的气源为采用N2与O2按比例稀释NO2标准气体配制而成。氮氧化物的检测方法按照GB17096-1997盐酸萘乙二胺分光光度法(以NO2浓度计),采用752型紫外光栅分光光度计,于540nm波长处比色测定。
本试验中,用于负载纳米TiO2的水泥混凝土的强度等级为C30,光催化混凝土脱模剂负载量约为144.34g/m2,负载深度为几个毫米。NO2的气体流量控制为0.5L/min,浓度为0.4mg/m3。通过测试进出口NO2气体浓度来衡量NO2的降解率并以此来表征光催化混凝土脱模剂的光催化效率,即其中C0为进口NO2浓度(mg/m3),C1为出口NO2浓度(mg/m3),η为光催化效率(%)。
根据上述实验测试方法,对实例1-5进行光催化效率检验,分别得到这五组光催化混凝脱模剂的催化效率如表1所示:
表1
可见,根据本发明专利的要求所制备的五组光催化混凝土脱模剂,对NO2气体显示出了良好的光催化效果,其光降解率均可达到40%以上,可为市政工程混凝土表面的光催化功能设计提供关键技术支撑,合成的脱模剂粉刷在混凝土模板上,拆模之后混凝土表面较为光滑,洁净。以上实践证明该混凝土脱模剂具有良好的光催化效果和脱膜效果。
Claims (4)
1.一种光催化混凝土脱模剂,其特征在于制备该脱模剂的原材料包括以下重量百分含量的材料组分:动物油脂2~5%、硬脂酸3~6%、机油1~3%、氢氧化钠0.1~2%、磷酸三丁酯0.1~0.3%、聚羧酸减水剂0.1~1%、聚合硫酸铁0.1~0.5%、蒙脱石负载纳米TiO2光催化剂10~20%,余量为水;
所述蒙脱石负载纳米TiO2光催化剂的制备方法为:将钠蒙脱石、柱撑剂、去离子水按照质量比1:1:10混合,搅拌均匀后微波加热处理3~5min,随后过滤,将滤渣洗涤至洗涤液中无Br-,然后烘干、研磨、过200目筛得到柱撑蒙脱石,将所得柱撑蒙脱石用乙醇配制成悬浮液,向该悬浮液中逐滴加入钛酸丁酯的乙醇溶液,其中柱撑蒙脱石与钛酸丁酯的质量比为1:3,搅拌反应6~8h,再陈化3~6h,之后过滤,向所得滤渣中逐滴加入蒸馏水,使得滤渣完全悬浮在水中即可,搅拌均匀,水解陈化24h,然后经过滤、干燥、研磨,得到水合氧化钛/蒙脱石复合物,将水合氧化钛/蒙脱石复合物在400~450℃下加热3~5h,再研磨、过200目筛得到蒙脱石负载纳米TiO2光催化剂。
2.根据权利要求1所述的光催化混凝土脱模剂,其特征在于:所述动物油脂包括猪油、羊油、牛油、鲸油、鱼油中的一种或多种。
4.一种根据权利要求1-3任一所述光催化混凝土脱模剂的制备方法,其特征在于步骤如下:
a.将动物油脂、硬脂酸加入反应釜,开动搅拌器搅拌,并加热至80-105℃使之全部溶解后,加入机油和磷酸三丁酯搅拌均匀;
b.向反应釜中加入氢氧化钠,搅拌20min进行皂化反应,再加入水搅拌30min;
c.进一步向反应釜中加入蒙脱石负载纳米TiO2光催化剂,搅拌5min;
d.向反应釜中加入聚羧酸减水剂、聚合硫酸铁并搅拌20min,冷却得到光催化混凝土脱模剂。
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