CN116285670B - 一种β-半水磷石膏表面杂化纳米二氧化硅疏水自清洁涂层的制备方法 - Google Patents
一种β-半水磷石膏表面杂化纳米二氧化硅疏水自清洁涂层的制备方法 Download PDFInfo
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- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 title claims abstract description 92
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- ZOMBKNNSYQHRCA-UHFFFAOYSA-J calcium sulfate hemihydrate Chemical group O.[Ca+2].[Ca+2].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O ZOMBKNNSYQHRCA-UHFFFAOYSA-J 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/26—Calcium sulfate cements strating from chemical gypsum; starting from phosphogypsum or from waste, e.g. purification products of smoke
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
本发明提出了一种β‑半水磷石膏表面H‑PDMS‑PMHS‑OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,包括以下步骤:制备磷石膏样品,干燥待用;将NaOH、Na2SO4加入到去离子水中,搅拌混合后得到碱性溶液,然后将磷石膏样品浸入该碱性溶液,取出干燥后得到羟基化的磷石膏样品;采用原位聚合法将H‑PDMS、PMHS和催化剂DBTDL混合,然后溶于正己烷溶剂中,形成H‑PDMS‑PMHS溶液;在该溶液中加入OTS,得到H‑PDMS‑PMHS‑OTS溶液,在H‑PDMS‑PMHS‑OTS溶液中加入疏水性纳米二氧化硅,得到表面处理剂;采用浸渍法将羟基化的磷石膏样品在上述表面处理剂中浸泡90min。本发明能解决磷石膏的环境污染问题,实现磷石膏固体废弃物的综合利用。
Description
技术领域
本发明涉及磷石膏表面涂层制备技术领域,特别涉及一种β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法。
背景技术
磷石膏作为磷复肥工业的重要副产品,其环境保护和资源综合利用面临很大压力,磷石膏资源的综合利用已成为磷复肥工业亟待解决的问题之一。研究和促进磷石膏资源的综合利用,对实现磷复肥行业的健康、可持续发展具有重要意义。磷石膏建材产品质量轻,保温性能好,但表面亲水,产品耐水性较差,长期在潮湿环境中会发生蠕变和溶融,导致其力学性能降低,这大大限制了其在功能建材领域的大规模工业应用目前。
发明内容
针对上述现有技术中存在的问题,本发明旨在提供一种β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,可用于建筑材料、室内装饰材料、路缘和排水沟等领域具有防水要求的环保、节能、可持续的磷石膏材料表面,能解决磷石膏的环境污染问题,实现磷石膏固体废弃物的综合利用。
为了实现上述目的,本发明提出了一种β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,包括以下步骤:
S1、制备磷石膏样品,干燥待用;
S2、将NaOH、Na2SO4加入到去离子水中,搅拌混合后得到碱性溶液,然后将磷石膏样品浸入该碱性溶液中,取出干燥后得到羟基化的磷石膏样品;
S3、采用原位聚合法将H-PDMS、PMHS和催化剂DBTDL混合,然后溶于正己烷溶剂中,搅拌混合后形成H-PDMS-PMHS溶液;
S4、在H-PDMS-PMHS溶液中加入OTS,得到H-PDMS-PMHS-OTS溶液,在H-PDMS-PMHS-OTS溶液中加入疏水性纳米二氧化硅,得到表面处理剂;
S5、采用浸渍法将羟基化的磷石膏样品在上述表面处理剂中浸泡30-90min,从而在β-磷石膏表面制得H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层。
上述方案中:在步骤S1中,制备磷石膏样品的水膏比为0.6,干燥采用鼓风干燥箱干燥,干燥温度50-80℃。
上述方案中:在步骤S2中,NaOH、Na2SO4,按质量比1:0.06添加,搅拌采用磁力搅拌,干燥采用鼓风干燥箱干燥,干燥温度50-80℃。
上述方案中:在步骤S3中,H-PDMS的质量为正己烷质量的10~12%,H-PDMS与PHMS的质量比为10:1(w/w),催化剂的用量为聚合物H-PDMS、PMHS总量的1wt%。
上述方案中:在步骤S4中,OTS用量为H-PDMS-PMHS溶液中溶剂质量的5%,疏水性纳米二氧化硅用量为H-PDMS-PMHS-OTS溶液中溶剂质量的2%。
上述方案中:在步骤S5中,浸泡时间为90min。
本发明的有益效果是:
1、采用聚硅氧烷原位聚合和浸渍法在β-磷石膏表面制备H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层,疏水涂层表面最大接触角为144.1°,对水滴附着力低,自洁性能好;从表面三维形貌和SEM图像可以看出,具有一定粗糙度的表面微纳疏水网络构建了磷石膏的疏水涂层。
2、XPS和FTIR测试表明,疏水涂层的碳元素和硅元素分别增加到48.82%和17.91%,原位反应生成的硅氧烷疏水网络通过氢键附着在磷石膏表面,使原本完全亲水的磷石膏表现出疏水性。
3、疏水涂层具有优异的化学稳定性,在强酸或强碱条件下,接触角可保持在135°以上;胶带粘接试验50次后,接触角仍为123.7°,经过100次磨损试验,接触角仍能保持在121.9°。
综上所述,H-PDMS-PMHS-OTS复合纳米二氧化硅疏水自洁涂料可用于建筑材料、室内装饰材料、路缘和排水沟等领域具有防水要求的环保、节能、可持续的磷石膏材料表面,对于解决磷石膏的环境污染问题,实现磷石膏固体废弃物的综合利用具有很大的潜力。
附图说明
图1为本发明的制作流程图。
图2为实施例1不同磷石膏样品的水接触角图。
图3为实施例1水滴在PGH-2表面、PGH-3表面的接触和脱离过程图。
图4为实施例1β-PG和PGH-3的自洁性能试验图。
图5为实施例1不同磷石膏样品的表面SEM图。
图6为实施例1不同磷石膏样品的表面FTIR光谱图。
图7为实施例1PGH-3分别浸入甲基橙染色的HCl溶液(PH=1)、MB染色的去离子水(PH=7)和罗丹明6G染色的NaOH溶液(PH=14)中的稳定性试验图。
图8为实施例1胶带粘接试验图。
图9为实施例1PGH-3随磨损时间的CA图、表面磨损试验示意图,以及PGH-3经0、50、100次磨损形貌的SEM图像。
具体实施方式
实施例1
一种β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,按照如下步骤制备:
S1、将半水磷石膏原料与水在搅拌器中充分混合(水膏比为0.6),得到磷石膏样品,将样品放置于鼓风干燥箱中50 -80℃下24h,使其完全干燥。
S2、将NaOH、Na2SO4按质量比1:0.06加入到去离子水中,且NaOH与去离子水的质量比为1:6,磁力搅拌10分钟后得到碱性溶液,将上述磷石膏样品浸入该碱性溶液中10分钟,然后置于鼓风干燥箱50-80℃中干燥24h,得到羟基化的磷石膏样品,即OH-PG。
S3、采用原位聚合法将H-PDMS(含氢聚二甲基硅氧烷)、PMHS(聚甲基氢硅氧烷)和催化剂DBTDL(二月桂酸二丁基锡)混合,然后溶于正己烷溶剂中,搅拌混合后形成H-PDMS-PMHS溶液;其中H-PDMS的质量为正己烷质量的10%,H-PDMS与PHMS的质量比为10:1(w/w),催化剂的用量为聚合物H-PDMS、PMHS总量的1wt%。
S4、在H-PDMS-PMHS溶液中加入OTS(十八烷基三氯硅烷),得到H-PDMS-PMHS-OTS溶液,在H-PDMS-PMHS-OTS溶液中加入疏水性纳米二氧化硅,得到表面处理剂。其中,OTS用量为H-PDMS-PMHS溶液中溶剂质量的5%,疏水性纳米二氧化硅用量为H-PDMS-PMHS-OTS溶液中溶剂质量的2%。
S5、采用浸渍法将羟基化的磷石膏样品在上述表面处理剂中浸泡90min,从而在β-磷石膏表面制得H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层。
实施例2
一种β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,按照如下步骤制备:
S1、将半水磷石膏原料与水在搅拌器中充分混合(水膏比为0.6),得到磷石膏样品,将样品放置于鼓风干燥箱中50 -80℃下24h,使其完全干燥。
S2、将NaOH、Na2SO4按质量比1:0.06加入到去离子水中,且NaOH与去离子水的质量比为1:6,磁力搅拌10分钟后得到碱性溶液,将上述磷石膏样品浸入该碱性溶液中10分钟,然后置于鼓风干燥箱50-80℃中干燥24h,得到羟基化的磷石膏样品,即OH-PG。
S3、采用原位聚合法将H-PDMS、PMHS和催化剂DBTDL混合,然后溶于正己烷溶剂中,搅拌混合后形成H-PDMS-PMHS溶液;其中H-PDMS的质量为正己烷质量的12%,H-PDMS与PHMS的质量比为10:1(w/w),催化剂的用量为聚合物H-PDMS、PMHS总量的1wt%。
S4、在H-PDMS-PMHS溶液中加入OTS(十八烷基三氯硅烷),得到H-PDMS-PMHS-OTS溶液,在H-PDMS-PMHS-OTS溶液中加入疏水性纳米二氧化硅,得到表面处理剂。其中,OTS用量为H-PDMS-PMHS溶液中溶剂质量的5%,疏水性纳米二氧化硅用量为H-PDMS-PMHS-OTS溶液中溶剂质量的2%。
S5、采用浸渍法将羟基化的磷石膏样品在上述表面处理剂中浸泡90min,从而在β-磷石膏表面制得H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层。
实施例2制得的疏水涂层与实施例1制得的疏水涂层接触角相近,其疏水涂层表面最大接触角为141.7°。
实验分析
上述步骤S3、S4、S5完成后的产物均可作为表面处理剂,将步骤S3得到的表面处理剂命名为P-1,将步骤S4得到的表面处理剂命名为P-2,将步骤S4得到的表面处理剂命名为P-3。以β-PG、P-1、P-2和P-3为不同磷石膏样品,进行对比实验。
图1为本发明的制作流程图。图2为不同磷石膏样品的水接触角图,改性时间对不同样品疏水性的影响如图所示,随着疏水改性时间的增加,样品的疏水性也有了很大的提高。PGH-1和PGH-2改性1.5h后接触角分别为114°和133.7°,PGH-3改性1.5h后接触角达到最大值144.1°。
图3展示了水滴在PGH-2表面的接触和脱离过程,以及水滴在PGH-3表面的接触和脱离过程。图4为β-PG和PGH-3的自洁性能试验图,(a)-(b)为铁粉,(c)-(d)为甲基橙染色的细沙粒。为了模拟抗污性,将铁粉和甲基橙染色的细沙颗粒作为涂抹剂撒在样品表面。
图5展示了疏水表面的自清洁特性。未处理的β-PG和疏水处理的磷石膏(在PGH-3的情况下)被放置在透明的塑料培养皿中作为比较,并在表面进行污染。如图5a和5c所示,在β-PGH磷石膏样品上滴入5ml去离子水。在β-PG磷石膏样品上滴入5ml去离子水。由于磷石膏表面的亲水性质,铁粉和细砂颗粒留在湿润的磷石膏表面,液滴在β-PG中完全饱和后向下滚动。如图5b和5d所示,水滴落在PGH-3表面后,由于附着力大,水和污垢相互聚集。在低表面能硅氧烷和疏水纳米二氧化硅的双重作用下,水滴可以保持球形,磷石膏材料表面的污垢被水滴的“卷净”效应迅速彻底去除,就像自然界中的荷叶一样。
半水磷石膏水化产物表面的微观结构决定了磷石膏的宏观疏水性能,通过分析不同处理方法处理1.5h后样品的SEM图像,进一步从微观角度解释PGH-1、PGH-2、PGH-3的疏水机理。对照样品β-PG如图5a-c所示,其中半水硫酸钙水化后形成二水硫酸钙晶体。长棒状晶体相互搭接交错,存在大量孔隙。水不仅渗透到孔隙中产生双向压力,使磷石膏内部产生内应力,而且溶解磷石膏硬化体的结晶接触点,使其再结晶,使其强度降低
PGH-1表面显微图像如图5d-f所示。磷石膏二水晶体表面完全被网状物质覆盖,这种物质是交联的H-PDMS-PMHS通过氢键在磷石膏表面形成疏水涂层。
由于OTS(图5g-h)的加入,OTS进一步参与了硅氧烷之间的缩合反应,磷石膏表面的疏水涂层呈现不规则排列的微米/纳米结构,网状结构提供了大量的空心大孔隙,起到了屏障作用,阻止了水与二水硫酸钙晶体的接触。
聚合物网格中纳米二氧化硅的加入(图5j-l)进一步降低了表面涂层的表面能,硫酸钙晶体和聚合物网络中的孔隙也被杂化的纳米二氧化硅填充。
图6为不同磷石膏样品表面的FTIR光谱。
不同磷石膏样品的FTIR结果对比如图6a所示。β-PG(CaSO4·2H2O),在3548和3408cm-1处的吸附峰是由于结晶水在CaSO4·2H2O中的对称拉伸。1689和1623cm-1附近的波峰是水合硫酸钙中结晶水的弯曲振动。位于1111cm-1的吸收峰被认为是SO4 2-的反对称拉伸。671和615cm-1处的峰被认为是SO4 2-的反对称弯曲,而471cm-1附近的峰被认为是SO4 2-的对称弯曲。
疏水处理后的磷石膏样品中也出现了上述峰,说明涂层没有改变磷石膏的基本结构。但与对照曲线β-PG相比,其他三个光谱由于表面涂层的包裹而出现了一些新的峰。2965、1265和872cm-1处的峰分别来自-CH3在硅氧烷中的拉伸振动和对称变形,以及Si-O的振动。图6b显示了PGH-2和PGH-3在2959-2788cm-1范围内的局部红外光谱。两种处理在2851cm-1和2919cm-1处均有明显的振动吸收峰,分别属于OTS长链烷基-ch2的对称拉伸模式和不对称拉伸模式。由此推测,OTS-C18H37的长烷基链成功参与了交联反应,进一步增加了表面疏水甲基的数量。由此,FTIR光谱表明PG表面存在紧密排列的聚合物疏水网络,降低了磷石膏的表面能,为疏水改性提供了必要条件。
图7为PGH-3分别浸入甲基橙染色的HCl溶液(PH=1)、MB染色的去离子水(PH=7)和罗丹明6G染色的NaOH溶液(PH=14)中的稳定性试验图。化学稳定性是评价磷石膏表面疏水性的关键因素。为了证明PGH-3在一定范围的腐蚀溶液中保持疏水性的能力,研究了PGH-3在不同pH(pH=1-14)溶液中的接触角。如图7所示,在PH=1~PH=10范围内,接触角大于140°,保持了良好的疏水性能。在PH=11-14时,接触角有一定程度的减小,小于140°,但仍大于136°,这可能是由于二氧化硅纳米颗粒在碱性介质中的部分溶解。将PGH-3浸泡在不同pH值的染色溶液中,去除后,其表面仍能保持干燥,不被水浸湿。
图8为胶带粘接试验图。胶带粘接试验是检测疏水涂层力学强度的有效方法。如图所示,经过50次粘附实验后,PGH-3表面仍能保持123.7°的接触角。
图9为PGH-3随磨损时间的CA图、表面磨损试验示意图,以及PGH-3经0、50、100次磨损形貌的SEM图像。
磨损实验过程如图9b所示,为了进一步研究表面疏水涂层的耐磨性,将100g重物放在PGH-3上,在400#砂纸表面以5cm/s的速度移动,每移动一定记为一次。结合接触角随磨损次数的变化(图9a),观察和分析磨损形貌的SEM(图9c,d,e)图像。
在无磨损的初始状态下(图9c),磷石膏表面完全被与纳米二氧化硅杂交的硅氧烷覆盖,二水合硫酸钙长棒状晶体被完全包裹,接触角为144.1°。磨损50次后(图9d),由于杂化聚集态结构被破坏,部分长棒状晶体暴露在空气中,接触角进一步减小至129.3°。磨损100次后(图9e),虽然磷石膏表面覆盖层逐渐消失,呈现交错叠接的石膏晶体,但由于二氧化硅颗粒在微结构孔隙中完全分散,石膏晶体表面存在尖状微纳米突起,表面接触角仍能保持在121.9°。
实验结论
综上所述,采用聚硅氧烷原位聚合和浸渍法在β-磷石膏表面制备了H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层。研究了不同疏水处理PG样品的表面润湿性、自清洁性能、微观形貌、表面粗糙度、表面化学信息以及涂层的稳定性和耐久性,其结论如下:
1、采用聚硅氧烷原位聚合和浸渍法在β-磷石膏表面制备H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层,疏水涂层表面最大接触角为144.1°,对水滴附着力低,自洁性能好;从表面三维形貌和SEM图像可以看出,具有一定粗糙度的表面微纳疏水网络构建了磷石膏的疏水涂层。
2、XPS和FTIR测试表明,疏水涂层的碳元素和硅元素分别增加到48.82%和17.91%,原位反应生成的硅氧烷疏水网络通过氢键附着在磷石膏表面,使原本完全亲水的磷石膏表现出疏水性。
3、疏水涂层具有优异的化学稳定性,在强酸或强碱条件下,接触角可保持在135°以上;胶带粘接试验50次后,接触角仍为123.7°,经过100次磨损试验,接触角仍能保持在121.9°。
因此,H-PDMS-PMHS-OTS复合纳米二氧化硅疏水自洁涂料可用于建筑材料、室内装饰材料、路缘和排水沟等领域具有防水要求的环保、节能、可持续的磷石膏材料表面,对于解决磷石膏的环境污染问题,实现磷石膏固体废弃物的综合利用具有很大的潜力。
Claims (3)
1.一种β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,其特征在于,包括以下步骤:
S1、制备磷石膏样品,干燥待用;
S2、将NaOH、Na2SO4加入到去离子水中,搅拌混合后得到碱性溶液,然后将磷石膏样品浸入该碱性溶液中,取出干燥后得到羟基化的磷石膏样品;
S3、采用原位聚合法将H-PDMS、PMHS和催化剂DBTDL混合,然后溶于正己烷溶剂中,搅拌混合后形成H-PDMS-PMHS溶液;
S4、在H-PDMS-PMHS溶液中加入OTS,得到H-PDMS-PMHS-OTS溶液,在H-PDMS-PMHS-OTS溶液中加入疏水性纳米二氧化硅,得到表面处理剂;
S5、采用浸渍法将羟基化的磷石膏样品在上述表面处理剂中浸泡30-90min,从而在β-磷石膏表面制得H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水涂层;
在步骤S2中,NaOH、Na2SO4按质量比1:0.06添加,搅拌采用磁力搅拌,干燥采用鼓风干燥箱干燥,干燥温度50-80℃;
在步骤S3中,H-PDMS的质量为正己烷质量的10~12%,H-PDMS与PHMS的质量比为10:1(w/w),催化剂的用量为聚合物H-PDMS、PMHS总量的1wt%;
在步骤S4中,OTS用量为H-PDMS-PMHS溶液中溶剂质量的5%,疏水性纳米二氧化硅用量为H-PDMS-PMHS-OTS溶液中溶剂质量的2%。
2.根据权利要求1所述的β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,其特征在于:在步骤S1中,制备磷石膏样品的水膏比为0.6,干燥采用鼓风干燥箱干燥,干燥温度50-80℃。
3.根据权利要求1所述的β-半水磷石膏表面H-PDMS-PMHS-OTS杂化纳米二氧化硅疏水自清洁涂层的制备方法,其特征在于:在步骤S5中,浸泡时间为90min。
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