四硼酸钠改性水玻璃制备保温材料及其性能研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (10): 3708-3716.

• 耐火材料 • 上一篇

四硼酸钠改性水玻璃制备保温材料及其性能研究

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:2022-07-05 修回日期:2022-07-29 出版日期:2022-10-15 发布日期:2022-10-26
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。主要从事多孔无机耐火材料的研究。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)

Properties of Thermal Insulation Materials Prepared by Sodium Silicate with Sodium Tetraborate Modification

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

College of Mining Engineering, North China University of Science and Technology, Tangshan 063210, China

Received:2022-07-05 Revised:2022-07-29 Online:2022-10-15 Published:2022-10-26

摘要/Abstract

摘要： 单一水玻璃发泡制备得到的保温材料具有不燃、质轻及导热系数低的优点,但耐水性较差制约了其实际应用。本文利用四硼酸钠改性水玻璃,采用低温烧结的方式制备得到保温材料。通过对该材料化学结构和物理性能的表征及离子浸出试验,研究四硼酸钠对材料性能的影响效果。结果表明:四硼酸钠能够有效降低材料中—OH的数量,并使Si—O结构更加复杂,从而提高材料的耐水性。当四硼酸钠的添加量为1%(质量分数,下同)时,其对材料中钠离子及硅酸根离子浸出的抑制效果最显著,两者的离子浓度分别降低65.33%和45.02%。当四硼酸钠的添加量为3%时,材料的软化系数可提高84.6%,其抗压强度、导热系数和表观密度分别为0.46 MPa、0.046 W/(m·K)和123.1 kg/m³。

关键词: 保温材料, 水玻璃, 四硼酸钠, 浸出试验, 耐水性, 软化系数

Abstract: The thermal insulation material prepared by sodium silicate has many advantages such as incombustibility, light weight and low thermal conductivity, but the poor water resistance restricts its application. Therefore, sodium tetraborate was chosen as the modifying agent and added into sodium silicate solution to prepare thermal insulation material by low temperature sintering. The chemical structure and physical properties of the material were characterized and ion leaching experiments were carried out to investigate the effects of sodium tetraborate. The results show that sodium tetraborate can effectively reduce the number of —OH groups in the material, and make Si—O structure more complex, which can improve the water resistance of the material. When the content of sodium tetraborate is 1% (mass fraction, the same bellow), it has the most significant inhibitory effect on the leaching of sodium ion and silicate ion in the material, and the ion concentrations of the two are reduced by 65.33% and 45.02%, respectively. When the sodium tetraborate content is 3%, the softening coefficient of the material is increased by 84.6%, and its compressive strength, thermal conductivity and apparent density are 0.46 MPa, 0.046 W/(m·K) and 123.1 kg/m³, respectively.

Key words: insulation material, sodium silicate, sodium tetraborate, leaching experiment, water resistance, softening coefficient

中图分类号:

TU55⁺1

冯静霞, 赵恒泽, 齐艺裴, 桑明明, 李晔. 四硼酸钠改性水玻璃制备保温材料及其性能研究[J]. 硅酸盐通报, 2022, 41(10): 3708-3716.

FENG Jingxia, ZHAO Hengze, QI Yipei, SANG Mingming, LI Ye. Properties of Thermal Insulation Materials Prepared by Sodium Silicate with Sodium Tetraborate Modification[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(10): 3708-3716.

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四硼酸钠改性水玻璃制备保温材料及其性能研究

Properties of Thermal Insulation Materials Prepared by Sodium Silicate with Sodium Tetraborate Modification

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