硼酸对水玻璃基保温材料性能影响研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1830-1837.

硼酸对水玻璃基保温材料性能影响研究

冯静霞, 赵恒泽, 齐艺裴, 桑明明, 李晔

华北理工大学矿业工程学院,唐山 063210

收稿日期:2021-12-31 修回日期:2022-02-15 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 李晔,博士,副教授。E-mail:liye@ncst.edu.cn
作者简介:冯静霞(1996—),女,硕士研究生。主要从事无机多孔材料的研究。E-mail:3039368080@qq.com
基金资助:
国家自然科学基金青年基金(51802097);河北省自然科学基金青年基金(E2020209038)

Effect of Boric Acid on Properties of Thermal Insulation Material Fabricated by Sodium Silicate

FENG Jingxia, ZHAO Hengze, QI Yipei, SANG Mingming, LI Ye

School of Mines, North China University of Science and Technology, Tangshan 063210, China

Received:2021-12-31 Revised:2022-02-15 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 水玻璃基保温材料具有轻质、导热系数低的优点,但其耐水性较差的问题亟待改善。将硼酸作为改性剂加入到水玻璃中,采用中温烧结法制备保温材料,通过对样品微观结构的表征和物理性能的测试,以及耐水性浸出试验,研究硼酸对水玻璃基保温材料性能的影响效果。结果表明,硼酸能够调节材料中Si—O四面体的框架结构,有效降低结构中的羟基数量,并抑制溶液中硅酸根离子和钠离子的浸出,提高材料的软化系数和耐水性能。当硼酸质量添加量为1.00%时,软化系数从改性前的0.519增至0.701,增加了35%。同时,硼酸的加入能够使材料内部孔径分布更加均匀,提高材料的抗压强度,但是材料的导热系数和表观密度也会增加。经0.75%(质量分数)硼酸改性后的保温材料导热系数、表观密度和抗压强度分别为0.052 W/(m·K)、128 kg/m³和0.442 MPa,满足保温材料的性能要求。

关键词: 保温材料, 硼酸改性, 微观结构, 浸出试验, 软化系数, 耐水性

Abstract: The thermal insulation material fabricated by sodium silicate has the advantages of lightweight and low thermal conductivity, however, its poor water resistance needs to be improved. In this paper, the thermal insulation materials were fabricated by an intermediate-temperature sintering method with boric acid as a modifier, and the effects of boric acid dosage on the microstructure and properties of the materials were investigated. The results show that boric acid can adjust the frame structure of Si—O tetrahedron and effectively reduce hydroxyl groups in the thermal insulation material. In addition, it improves the softening coefficient of the thermal insulation material, and inhibits the leaching of silicate ions and sodium ions in the solution, which improves the water resistance of the material. When boric acid content is 1.00% (mass fraction), the softening coefficient increases from 0.519 to 0.701, increasing by 35%. At the same time, boric acid can make the pore size distribution of the thermal insulation material more uniform, and improve its compressive strength. But the thermal conductivity and apparent density of the thermal insulation material will increase slightly. The thermal conductivity, apparent density and compressive strength of the thermal insulation material modified by 0.75% boric acid are 0.052 W/(m·K), 128 kg/m³ and 0.442 MPa, respectively. And it satisfies the performance requirements of inorganic thermal insulation materials.

Key words: thermal insulation material, boric acid modification, microstructure, water leaching test, softening coefficient, water resistance

中图分类号:

TU55⁺1

冯静霞, 赵恒泽, 齐艺裴, 桑明明, 李晔. 硼酸对水玻璃基保温材料性能影响研究[J]. 硅酸盐通报, 2022, 41(5): 1830-1837.

FENG Jingxia, ZHAO Hengze, QI Yipei, SANG Mingming, LI Ye. Effect of Boric Acid on Properties of Thermal Insulation Material Fabricated by Sodium Silicate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1830-1837.

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