CN110697769A - 一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂及其制备方法 - Google Patents
一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂及其制备方法 Download PDFInfo
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- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 196
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- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 1
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- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
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Abstract
本发明涉及一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂及其制备方法,属于新型无机材料的技术领域。本发明充分利用了二氧化钛不同物相的紫外屏蔽性能特点,在钛醇盐的水热合成体系中,以廉价的无机钠盐为晶型导向剂,制备了锐钛矿/板钛矿复相二氧化钛紫外屏蔽材料。不仅弥补了锐钛矿型二氧化钛紫外区域光散射和反射差的缺点,同时也保障了复合屏蔽剂的可见光透射效果。该方法可通过调节晶型导向剂的用量,控制复相屏蔽剂中锐钛矿型TiO2与板钛矿型TiO2的比例,从而根据需要调节屏蔽剂在UVA和UVB区段的工作性能。同时,也可利用复相TiO2不同晶相晶粒之间的相互作用,抑制TiO2的晶粒生长,成功实现TiO2的纳米化控制,从而保障所得紫外屏蔽剂的优异性能。
Description
技术领域
本发明涉及一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂及其制备方法,属于新型无机紫外屏蔽材料的技术领域。
背景技术
根据太阳光的波长一般将其分为三个波段,UVC(200-280nm)、UVB(280-320nm)、UVA(320-400nm)。其中UVB,UVA对人的健康危害较大,而长时间的紫外光照也会对纺织品、高分子涂料等的强度、色泽等迅速退化。因此,制备户外使用的高分子材料、服装等都需要紫外屏蔽剂的保护。紫外屏蔽剂可分为无机和有机紫外屏蔽剂两种,常见的无机紫外线屏蔽材料主要包括金属氧化物(二氧化钛、氧化锌、氧化锡、氧化铈)、炭黑和滑石粉等,与有机紫外线吸收剂相比,无机紫外线阻滞剂毒性小,环保性强,成本优势明显,对紫外线表现出良好的吸收、反射和散射特性。【CN102515567A】介绍了一种具有紫外屏蔽性能的纳米CeO2薄膜的制备方法。首先将金属化合物按照一定的质量比加入到0.1~1mol/L铈盐溶液中,充分混合后向其中加入事先准备好的0.5~2mol/L沉淀剂与氟化剂的混合溶液,将溶液pH控制在6~9,在10~95℃温度下充分搅拌2~4小时后陈化2~30小时。进行过滤、洗涤、干燥,即获得掺杂氟离子和金属离子的氧化铈基纳米紫外屏蔽材料。该紫外屏蔽剂在紫外区具有较好的紫外屏蔽性能,而且在可见光区域也有较好的透过率,但是掺杂金属离子对样品的颜色有一定影响。
相比于其他光吸收型半导体屏蔽剂,纳米TiO2的成本显著低于稀土氧化物,且自身白度高、禁带宽度窄、比表面积高、具有优良的光吸收和散射特性,并可制作成胶体对目标材料进行涂覆防护,是一种颇具应用前景的高效紫外屏蔽材料。多年来,人们围绕不同晶型TiO2的合成、改性、纳米化控制及其紫外屏蔽性能开展了一定工作,但是能实现高效紫外屏蔽的纳米TiO2的合成与控制依然还存在技术经济性等问题,也限制了这种材料的推广应用。研究结果显示,TiO2虽然具有紫外吸收功能,但其三种晶型对紫外线的屏蔽能力有一定差别。锐钛矿型TiO2较容易在常温合成,但其光折射率较低,导致其紫外屏蔽性能也相对较弱。金红石型TiO2折光率最高,屏蔽效果也最为显著,但往往需要高温处理才能获得,此时TiO2颗粒生长已经较为显著,难以得到纳米级粉体,影响屏蔽剂涂覆后纺织品的手感,而且其屏蔽波谱范围较宽几乎覆盖全部可见光区,无法制成透明的紫外屏蔽膜。而板钛矿型TiO2具备较高的折光率和较好的紫外屏蔽性能,且可以在常温合成,但是合成纯相板钛矿型TiO2较为困难,因此其相关紫外屏蔽功能的报道也极少。
傅小明在《锐钛矿型TiO2纳米颗粒的水热水解法合成及其光吸收特性》介绍了一种以硫酸钛为钛源,浓氨水为沉淀剂,在pH=9条件下240℃水热48h,合成粒径约为20nm锐钛矿TiO2纳米颗粒的方法。但是纳米级锐钛矿型TiO2非常容易团聚,一旦在使用过程中发生团聚就难以达到预期的紫外屏蔽效果。
相比于锐钛矿型TiO2,金红石型TiO2的屏蔽效果更好。王兰武在《屏蔽紫外用金红石型纳米TiO2的制备》一文中介绍了一种以偏钛酸为钛源,用溶胶-凝胶法制备金红石型纳米二氧化钛紫外屏蔽剂的方法。制备的金红石型TiO2具备更窄的禁带宽度,和更高的折射率,对UVA和UVB吸收反射效果更好。但是由于金红石型TiO2属于热稳定相,制备金红石型TiO2往往需要在高温环境下进行,此时颗粒已经开始显著生长,无法将TiO2的晶型优势充分发挥出来。而且,金红石型TiO2的白度优异、散射效果过于明显,往往将大部分可见光也遮挡住,无法实现在光学基本透明的情况下屏蔽紫外线。
【CN1076004644A】介绍了一种TiO2/伊利石无机紫外屏蔽剂的制备方法。首先对伊利石原土进行提纯、分散,在超声分散好的伊利石原浆中,以硫酸钛为钛源,氨水做为沉淀剂,通过氨水调控体系pH值生成前驱体沉淀。待在磁力搅拌器搅拌2h后,将制备好的前驱体在烘箱中进行180℃水热反应12h,最后对样品进行离心、洗涤、干燥,即获得新型的TiO2/伊利石无机紫外屏蔽剂。该方法依托伊利石载体实现了锐钛矿型TiO2的纳米化控制,并辅以伊利石片层的光反射功能,从而在显著降低成本的同时保障了材料的紫外屏蔽性能,但该方法所得TiO2均为锐钛矿相,无法对负载的TiO2进行晶型调控。
【CN103030176A】介绍了控制纳米二氧化钛形貌和晶型转变的合成方法。以钛酸正四丁酯为钛源,L-半胱氨酸为晶型控制剂制备不同的晶型形貌的二氧化钛。首先将2mmolL-半胱氨酸与10ml氨水混合得模板剂溶液,然后向模板剂溶液中加入体积比为1:1的20ml蒸馏水与无水乙二胺混合溶液,经磁力搅拌一段时间后获得清亮溶液。将钛酸正四丁酯加入到该溶液中磁力搅拌30min后,在180℃温度下进行24小时的水热反应。待反应结束后离心、洗涤、干燥,获得了不同晶型的二氧化钛。但该方法需要使用昂贵的有机模板剂对TiO2的晶型进行控制,有机溶剂的用量也较大,成本较高。且该方法并未对所获得的不同晶型TiO2的紫外屏蔽性能或其在紫外屏蔽领域的应用进行报道。
针对锐钛矿型TiO2紫外吸收能力不足、金红石型TiO2纳米化困难且不透明、而板钛矿型TiO2纯相合成成本过高的问题,本发明将TiO2不同屏蔽性能的两种低温亚稳相进行了有效复合,提出了一种锐钛矿/板钛矿TiO2复相紫外屏蔽剂的制备方法。该方法使用廉价的无机钠盐做为晶型导向剂,在锐钛矿型TiO2的制备体系中诱导部分锐钛矿型二氧化钛转变为板钛矿型二氧化钛,从而利用板钛矿型二氧化钛本身白度高、光折射率高、对UVA的防护效能好等优点,弥补锐钛矿型二氧化钛紫外区域光散射和反射差的缺点,同时又保障了复合屏蔽剂的可见光透射效果。通过调节晶型诱导剂的用量,可以控制复相屏蔽剂中锐钛矿型TiO2与板钛矿型TiO2的比例,从而根据需要调节屏蔽剂在UVA和UVB区段的工作性能。同时,该方法也可利用复相TiO2不同晶相晶粒之间的相互作用,抑制TiO2的晶粒生长,从而成功实现TiO2的纳米化控制,保障了复相TiO2的紫外屏蔽效果。
发明内容
本发明的目的是通过以下技术方案实现的:
1)称取摩尔范围比为1:0.5~1:4的钛醇盐和三乙醇胺溶剂,在磁力搅拌器上充分搅拌30分钟,使其充分混合后记作a体系。
2)称取一定量的无机钠盐配制成0.2~2.5mol/L的水溶液,在磁力搅拌器上搅拌30分钟后,使其充分溶解记作溶液b。
3)将不同浓度的b溶液缓慢加入到a体系中,使得Ti4+:Na+摩尔范围比为1mol:0.2~10mol,并保持混合体系中Ti4+的浓度在0.25~1mol/L的范围。磁力搅拌器上搅拌2h~12h后,将上述配好的溶液加入到聚四氟乙烯内衬反应釜中,在160℃~200℃水热处理16~30h,待样品冷却后进行离心洗涤。将离心产物在60~90℃下烘干,研磨后得到锐钛矿/板钛矿复相二氧化钛无机紫外屏蔽剂。
所述的钛醇盐限定为:钛酸丁酯、钛酸乙酯、异丙醇钛中的任一种或两种。
所述的无机钠盐限定为:NaCl、NaNO3、Na2SO4中的任一种或几种的混合物。
有益效果:针对单一晶型二氧化钛紫外屏蔽剂在制备和使用中遇到的问题,本发明利用廉价无机钠盐对锐钛矿型二氧化钛的生成进行抑制,从而实现了锐钛矿型TiO2与板钛矿型TiO2在有机-无机水热合成体系中的制备与复合同步完成,并借此有效调控了锐钛矿/板钛矿复相二氧化钛中两种物相的比例,在实现屏蔽剂自身光谱调节的同时,也通过复相晶格间的相互作用保障了TiO2的纳米化及其紫外屏蔽性能。本发明通过同质异相复合的方式,解决了单一TiO2晶相对紫外线吸收性能差,光散射、反射效果不理想,吸收光谱单一等缺点。所得复相二氧化钛不仅具有白度高、折射率高、UVA屏蔽效果好等板钛矿型TiO2的优势,也兼具了锐钛矿型TiO2的成本优势,并通过复相单步合成实现了TiO2的纳米化控制,从而保障了锐钛矿/板钛矿复相二氧化钛的紫外屏蔽性能明显优于单一物相TiO2。与其他无机紫外屏蔽剂的制备方法相比,该方法制备工艺简单、重现性好、无需煅烧、能耗低、可实现晶粒的纳米化控制,所得锐钛矿/板钛矿复相二氧化钛的紫外屏蔽效果优异且屏蔽光谱范围可调,可广泛用于对纺织品以及其它紫外线易损的高分子材料的紫外防护。
附图说明
图1为实施例1、2、3、4中锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂的XRD衍射图谱;
图2为实施例1、2、3、4中锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂的UV-Vis紫外透射光谱。
具体实施方式
下面结合实施例和附图对本发明作进一步详细说明:
实施例1
称取10ml的钛酸丁酯,向其加入16ml三乙醇胺溶剂,在磁力搅拌器上充分搅拌30分钟,使其充分分散,然后称取1.17gNaCl加入到100ml蒸馏水中配制成0.2mol/l的NaCl溶液在磁力搅拌器上搅拌30分钟后。将分散好的25mlNaCl溶液缓慢加入到配制好的钛酸丁酯有机溶剂体系中,使得Ti4+浓度约为1mol/L。在磁力搅拌器上充分分散1h后,将上述配制好的溶液加入到聚四氟乙烯反应釜中,在160℃水热反应24h,待样品冷却后进行离心洗涤。将离心产物在100℃下烘干。最后用研钵研磨3分钟后,得到锐钛矿/板钛矿二氧化钛无机紫外屏蔽剂。对样品进行UV-Vis透射光谱分析,结果显示其可以屏蔽70%的UVA以及近87%的UVB、UVC。将制备好的样品配制成20g/l的悬浮液,加入表面活性剂后,磁力搅拌12h,然后将棉织物浸入到分散液中,超声处理15分钟后室温干燥,在紫外灯(185nm*2)下光照8h后,织物的断裂强力保留率为41.7%,相比于未涂层样品提升了63.1%。
实施例2
称取10ml的钛酸丁酯,向其加入8ml三乙醇胺溶剂,在磁力搅拌器上充分搅拌30ml分钟,使其充分分散,然后称取5.85gNaCl加入到100ml蒸馏水中配制成1mol/l的NaCl溶液在磁力搅拌器上搅拌30分钟后。将分散好的50mlNaCl溶液缓慢加入到配制好的钛酸丁酯有机溶剂体系中,使得Ti4+浓度在0.5mol/L左右。在磁力搅拌器上充分分散1h后,将上述配制好的溶液加入到聚四氟乙烯反应釜中,在180℃水热反应24h,待样品冷却后进行离心洗涤。将离心产物在100℃下烘干。最后用研钵研磨3分钟后,得到锐钛矿/板钛矿二氧化钛无机紫外屏蔽剂。板钛矿的含量达到了30%。对样品进行UV-Vis透射光谱分析,结果显示其可以屏蔽70%的UVA以及近92%的UVB、UVC。将制备好的样品配制成20g/l的悬浮液,加入表面活性剂后,磁力搅拌12h,然后将棉织物浸入到分散液中,超声处理15分钟后室温干燥,在紫外灯(185nm*2)下光照8h后,织物的断裂强力保留率为46.2%,相比于未涂层样品提升了68.4%。
实施例3
称取10ml的钛酸丁酯,向其加入2ml三乙醇胺溶剂,在磁力搅拌器上充分搅拌30ml分钟,使其充分分散,然后称取21.25gNaNO3加入到100ml蒸馏水中配制成2.5mol/l的NaNO3溶液在磁力搅拌器上搅拌30分钟后。将分散好的100mlNaNO3溶液缓慢加入到配制好的钛酸丁酯有机溶剂体系中,使得Ti4+浓度在0.25mol/L左右。在磁力搅拌器上充分分散1h后,将上述配制好的溶液加入到聚四氟乙烯反应釜中,在160℃水热反应30h,待样品冷却后进行离心洗涤。将离心产物在100℃下烘干。最后用研钵研磨3分钟后,得到锐钛矿/板钛矿二氧化钛无机紫外屏蔽剂。得到锐钛矿/板钛矿二氧化钛无机紫外屏蔽剂。然乎对样品进行UV-Vis透射光谱分析,然乎对样品进行UV-Vis透射光谱分析,结果显示其可以屏蔽65%的UVA以及近80%的UVB、UVC。将制备好的样品配制成20g/l的悬浮液,加入表面活性剂后,磁力搅拌12h,然后将棉织物浸入到分散液中,超声处理15分钟后室温干燥,在紫外灯(185nm*2)下光照8h后,织物的断裂强力保留率36.3%,相比于未涂层样品提升了57.8%。
实施例4
称取2.3ml的钛酸乙酯,向其加入8ml三乙醇胺溶剂,在磁力搅拌器上充分搅拌30分钟,使其充分分散,然后称取14.2g Na2SO4加入到100ml蒸馏水中配制成1mol/l的Na2SO4溶液在磁力搅拌器上搅拌30分钟后。将分散好的100mlNa2SO4力搅拌器上充分分散1h后,将上述配制好的溶液加入到聚四氟乙烯反应釜中,使得Ti4+浓度在0.25mol/L左右在200℃水热反应24h,待样品冷却后进行离心洗涤。将离心产物在100℃下烘干。最后用研钵研磨3分钟后,得到锐钛矿/板钛矿二氧化钛无机紫外屏蔽剂。得到锐钛矿/板钛矿二氧化钛无机紫外屏蔽剂。然乎对样品进行UV-Vis透射光谱分析,然乎对样品进行UV-Vis透射光谱分析,结果显示其可以屏蔽62%的UVA以及近78%的UVB、UVC。将制备好的样品配制成20g/l的悬浮液,加入表面活性剂后,磁力搅拌12h,然后将棉织物浸入到分散液中,超声处理15分钟后室温干燥,在紫外灯(185nm*2)下光照8h后,织物的断裂强力保留率32.1%,相比于未涂层样品提升了52.5%。
Claims (5)
1.一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂,其特征在于,所述的锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂以钛醇盐作为钛源,以廉价的无机钠盐作为晶型导向剂,经有机-无机水热反应同质异相复合而成,所得复合物中仅含有锐钛矿型和板钛矿型二氧化钛,且物相比例及光谱屏蔽特征可调可控。
2.按照权利要求1所述的一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂,其特征在于,板钛矿型二氧化钛含量占复相二氧化钛总质量的60~15wt%。
3.按照权利要求1所述的一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂,其特征在于,所述的钛醇盐为钛酸丁酯、钛酸乙酯、异丙醇钛中的任一种或两种的混合物。
4.按照权利要求1所述的一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂,其特征在于,所述的无机钠盐为NaCl、NaNO3、Na2SO4中的任一种或几种的混合物。
5.按照权利要求1所述的一种锐钛矿/板钛矿复相二氧化钛紫外屏蔽剂的制备方法,其特征在于,包括以下步骤:
1)称取摩尔比为1:0.5~1:4的钛醇盐和三乙醇胺溶剂,搅拌使其充分混合后记作a体系;
2)将一定浓度的无机钠盐水溶液缓慢加入到a体系中,使得Ti4+:Na+摩尔范围比为1:0.2~1:10,并保持混合体系中Ti4+的浓度在0.25~1mol/L的范围,磁力搅拌均匀后转入反应釜中,在160℃~200℃水热处理一定时间,待样品冷却后进行离心、洗涤、烘干、研磨,最终得到锐钛矿/板钛矿复相二氧化钛无机紫外屏蔽剂。
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CN115974147A (zh) * | 2022-12-09 | 2023-04-18 | 江南大学 | 一种手性二氧化钛及其制备方法与应用 |
CN115974147B (zh) * | 2022-12-09 | 2023-09-29 | 江南大学 | 一种手性二氧化钛及其制备方法与应用 |
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