纳米聚多巴胺六方氮化硼–二氧化硅/环氧树脂涂层对水泥砂浆抗碳化能力的影响

刘嘉源; 张宏亮; 左晓宝; 邹欲晓

纳米聚多巴胺六方氮化硼–二氧化硅/环氧树脂涂层对水泥砂浆抗碳化能力的影响

南京理工大学　理学院, 南京210094

基金项目: 国家自然科学基金(52078252；51778297)

详细信息

通讯作者:
左晓宝, 博士, 教授, 研究方向为混凝土材料与结构　E-mail：xbzuo@sina.com

中图分类号: TU593
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- 文章访问数: 196
- HTML全文浏览量: 113
- 被引次数: 0
出版历程
- 收稿日期: 2022-10-05
- 修回日期: 2022-11-13
- 录用日期: 2022-12-02
- 网络出版日期: 2022-12-19

Effect of nano polydopamine hexagonal boron nitride-functionalised silicon dioxide/epoxy coating for resistance carbonation ability of cement mortar

School of Science, Nanjing University of Science and Technology, Nanjing 210094, China

Funds: National Natural Science Foundation of China(52078252; 51778297)

摘要

摘要: 环氧树脂具有价格低、绝缘性好和附着力强等优点，研究表明，在环氧树脂中掺入纳米填料，涂覆在混凝土结构表面，能形成致密的防腐涂层，可显著提升混凝土结构的耐久性。但未经功能化处理的纳米填料与环氧树脂的相容性较差，所制备的涂层难以充分发挥对混凝土及其结构的防护作用。本文选用理化性质稳定、韧性强且具有绝缘性质的纳米六方氮化硼(hBN)，通过将纳米hBN片层和纳米二氧化硅 (SiO₂) 颗粒表面功能化处理，再经聚合制备出一种新型的纳米PDABN-fSiO₂材料，再将其掺入环氧树脂，获得了纳米聚多巴胺六方氮化硼–二氧化硅(PDABN-fSiO₂)/环氧树脂涂层，涂覆于水泥砂浆试件表面，以提高其抗碳化能力。纳米hBN片层与SiO₂颗粒的表面功能化处理，解决了纳米填料与环氧树脂相容性较差的问题，纳米PDABN-fSiO₂在环氧树脂中具有良好的分散性和“片层+颗粒”特殊结构，可有效填充涂层内部裂隙，增强涂层对水泥砂浆的防护性能，同无填料涂层相比，涂覆有纳米PDABN-fSiO₂/环氧树脂涂层的水泥砂浆试件，在碳化7、14和28天时的碳化深度分别下降了68.7%、72.9%和64.8%，其涂层在48h的透气性降低了34.7%。1掺入不同纳米填料的环氧树脂涂层的各项试验结果
- 纳米PDABN-fSiO₂ /
- 环氧树脂涂层 /
- 微观表征 /
- 碳化 /
- 透气性
Abstract: In order to obtain nanomaterials with better dispersal, filling and barrier properties, which were used as fillers to enhance the protection of the epoxy coatings for cement mortar, the polydopamine (PDA), which was prepared by self-polymerization of dopamine hydrochloride (DA) and silane coupling agent (KH550), was utilized to modify nano hexagonal boron nitride (hBN) and nano silicon dioxide (SiO₂), respectively, to obtain two nanomaterials PDABN and functionalised SiO₂(fSiO₂) by polymerization reactions. A new nanomaterial, polydopamine hexagonal boron nitride - functionalised silicon dioxide (PDABN-fSiO₂), was synthesized, and it was mixed with epoxy to prepare a modified coating. The coating was covered on the surface of cement mortar to enhance its carbonation resistance. The microscopic characteristics of nano materials were observed by FT-IR, SEM-EDS and XPS. The modified effect of epoxy coating by nano PDABN-fSiO₂ was analyzed by carbonation experiments and permeability tests. Results indicate that the prepared nano PDABN-fSiO₂ has a layer-particle structure and better dispersion in coating, which can effectively slow down the penetration of CO₂ in the coating. Compared with the blank coating, the carbonation depth of the cement mortar coated with nano PDABN-fSiO₂/epoxy coating is decreased by 68.7%, 72.9% and 64.8% at 7, 14 and 28 days of carbonation, respectively, and the permeability of its coating is decreased by 34.7% at 48 hours. Thus, the epoxy coating with nano PDABN-fSiO₂ can significantly improve the carbonation resistance of cement mortar and reduce its permeability.
- nano PDABN-fSiO₂ /
- epoxy coating /
- microscopic test /
- carbonation /
- permeability

HTML全文

图 1 掺入纳米聚多巴胺六方氮化硼–二氧化硅(PDABN-fSiO₂)的环氧树脂涂层制备流程

Figure 1. Preparation process of nano polydopamine hexagonal boron nitride - functionalised silicon dioxide (PDABN-fSiO₂) epoxy coating

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图 2 环氧树脂中纳米填料的分散过程

Figure 2. Dispersion process of nano fillers in epoxy resins

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图 3 涂层透气性试验装置示意图

Figure 3. Experimental diagram of the gas permeability of coatings

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图 4 各种纳米材料的FT-IR光谱

Figure 4. FT-IR spectra of various nano materials

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图 5 各种纳米填料的SEM图像及纳米PDABN-fSiO₂不同测试区域的EDS图谱

Figure 5. SEM images of various nano fillers and EDS spectra of nano PDABN-fSiO₂ about different areas

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图 6 各种环氧树脂涂层断面处SEM图像及其Mapping分析结果

Figure 6. SEM images and mapping analysis results of cross sectional about various epoxy coatings

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图 7 纳米PDABN-fSiO₂的XPS图谱与纳米PDABN-fSiO₂的XPS高分辨图谱

Figure 7. XPS spectra of nano PDABN-fSiO₂ and its high-resolution XPS spectra

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图 8 水泥砂浆表面涂覆掺入不同填料的环氧树脂涂层在7、14和28天时酚酞显色结果

Figure 8. Results of phenolphthalein color test on cement mortar coated with epoxy coatings with different fillers at 7, 14 and 28 days

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图 9 水泥砂浆表面涂覆掺入不同填料的环氧树脂涂层在7、14和28天时水泥砂浆试件碳化深度

Figure 9. Carbonization depth of cement mortar coated with epoxy coatings with different fillers at 7, 14 and 28 days

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图 10 干燥剂吸水量随时间变化曲线

Figure 10. Curve of water absorption of desiccant with time

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表 1 水泥的氧化物组成的质量分数(wt%)

Table 1. Oxide composition of cement (wt%)

Cement	CaO	SiO₂	Al₂O₃	Fe₂O₃	SO₃	MgO	K₂O	Na₂O	TiO₂
P.II 52.5	66.92	19.28	4.20	3.78	2.07	1.84	0.74	0.30	0.26

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表 2 制备各种含有填料的环氧树脂涂层所需材料与用量

Table 2. Materials and quantities required for the preparation of various epoxy coatings with fillers

Sample	Coating filler component	Epoxy dosage/g	Total amount of filler/g
Epoxy Coating	Blank	5	−
Nano SiO₂/Epoxy Coating	Nano SiO₂	5	0.05
Nano PDABN/Epoxy Coating	Nano PDABN	5	0.05
Nano PDABN-SiO₂/Epoxy Coating	Nano PDABN-fSiO₂	5	0.05

下载: 导出CSV

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