采用ZnO晶须/纳米TiO_2复合粒子改善钢结构防火涂料的性能

Improvement of Performance of Steel Structural Fireproofing Dope with ZnO Whisker and Nanometer TiO_2

以氧化锌晶须和锐钛型纳米二氧化钛为添加剂来提高钢结构防火涂料的各项性能.系统研究了氧化锌晶须和纳米二氧化钛的改性,以及改性后晶须和纳米二氧化钛对防火涂料耐火性能、耐水性能、力学性能以及抗菌性等的影响,通过扫描电子显微镜(SEM)观察了复合材料的断面以及粒子在基体中的分散状况.研究表明,使用质量分数为0.5%的KH560改性后的氧化锌晶须具有较好的分散性,使用质量分数为6%的硅铝复合包膜改性后的纳米二氧化钛具有较好的分散性能;与单一的钢结构防火涂料相比,氧化锌晶须添加量的质量分数为5%时,改性钢结构防火涂料的性能有较大的提高,其耐火极限由96,min提高到118,min,耐水极限由28,h提高到37,h,黏结强度由0.45,MPa提高到1.12,MPa;纳米二氧化钛的加入可有效提高氧化锌晶须/防火涂料的抗菌性能,当纳米二氧化钛的添加量为0.5%时,防火涂料的灭菌率可达99.9%.

The performance of steel structural fireproofing dope was improved through adding the ZnO whisker and nanometer titanic dioxide （ TiO2 ） in this paper. The modification process of ZnO whisker and the influence of ZnO whisker on improving the performance of fireproofing dope, such as the fire-resisting performance, water-resisting performance, mechanics performance and anti-bacterium were studied in detail, and the nanometer TiO2 was studied in the same way as the ZnO whisker. The results show that the ZnO whisker modified with 0.5% （ mass fraction） KH560 possesses better dispersion characteristic, and the nanometer TiO2 powders modified with 6% Na2SiO3 and Al2 （SO4） 3 （ 1 ： 1 ） has better dispersion characteristic too. The performance of fireproofing dope with 5% modified ZnO whisker added was improved largely; The limit of fire resistance was improved from 96 min to 118 min; the limit of water resistance was improved from 28 h to 37 h; the intensity of felt was improved from 0.45 MPa to 1.12 MPa, too. The results also show that with 0.5% nanometer TiO2 added the anti-bacterium of fireproofing dope can reach 99.9%.