The Study’s Chemical Interaction of the Sodium Silicate Solution with Extender Pigments to Investigate High Heat Resistance Silicate Coating

Cuong Manh Le,Thu-Huong Le,Tien Duc Pham

doi:10.1155/2021/5510193

Abstract

Silicate coating is water-based paint with many advantages and wide applications in many different industries. However, there are still some problems with silicate coating: how to increase its resistance to heat at high temperatures and prolong the life of the coating. Silicate paints have high durability and longevity dependent mainly on the chemical interaction of the silicate binder with extender pigments. Therefore, our groups have studied the geopolymerization process of the sodium silicate solution with extender pigments to investigate high heat resistance silicate coating. The effect of curing time on the chemical interaction between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) was investigated by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analysis (TGA), and X-ray diffraction (XRD). The shift of antisymmetric stretching vibration of the Si-O-Si bond (1060 cm−1) to low frequency and increase of the intensity of the Si-O-Si stretching as curing time increases from 1 to 20 days are due to the increased chemical interaction between extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) and sodium silicate solution. Moreover, TG results of ZnO-silicate, TiO2-silicate, CaCO3-silicate, Na2SiF6-silicate, and Fe2O3-silicate coating at 1 and 20 days of curing show high residual geopolymer about 69–90% at 800°C. Thus, we proposed that the geopolymerization process between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) increases when the curing time from 1 to 20 days leads to forming geopolymer silicate with high thermal stability. In addition, the optimal mixing ratio between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) is as follows: 25% binder (sodium silicate solution), 8% ZnO; 5% TiO2, 5% Fe2O3, 1% Na2SiF6, 21% CaCO3, 34% H2O, and 1% additives to make high heat resistance silicate coating with temperature resistance at 1000°C.

Highlights

Vietnam is a country that has a tropical climate with high humidity and high temperature
Fourier transform infrared spectroscopy (FT-IR) measurements were conducted on a Nicolet 380 spectrometer (Waltham, MA, USA) operated in the mid-IR range of 4000–400 cm−1, with spectra obtained at a spectral resolution of 8 cm−1 in transmittance mode. ermogravimetric analysis (TGA) and derivative thermogravimetry (DTG) were performed using a METTLER TOLEDO SDTA851e
As the discussion in FT-IR results, the shift of antisymmetric stretching vibration of the Si-O-Si bond (1060 cm−1) to low frequency and increase of the intensity of the Si-O-Si stretching as curing time increases from 1 to 20 days are due to the chemical interaction between extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) and sodium silicate solution to form new bonds. erefore, we proposed that the geopolymerization process between sodium silicate solution and extender pigments (ZnO, TiO2, Fe2O3, CaCO3, and Na2SiF6) increases when the curing time increases from 1 to 20 days leading to forming geopolymer silicate with high thermal stability

Summary

Introduction

Vietnam is a country that has a tropical climate with high humidity and high temperature. Coating technology is used as a film to protect buildings from chemical attack and corrosion of the environment. E organic coating such as epoxy resin shows good mechanical performance, chemical resistance, and anticorrosive effect [2]. Organic-inorganic hybrid materials are materials in which organic (epoxy resin) and inorganic (rice husk silica [4, 5], nano-glass fiber, and silanized coal fly ash [6]) components are mixed to enhance the mechanical and fracture toughness of epoxy resin. E inorganic coating is the main component of cross-linked inorganic binders such as silicon resin [7], water- and solvent-based silicates [8], silanes [9], and a mixture of the organic binder with silicate [10].

Methods

Results

Conclusion