Papers by Keyword: HCHO

Abstract: Nanocrystalline cellulose (NCC) was used for improving the formaldehyde (HCHO) emission and bonding strength of urea formaldehyde (UF) resin adhesive in fiberboard and plywood. The original NCC was modified by 3-aminopropyltriethoxysilane (APTES) and the wetting property with UF resin adhesive was improved by 26.4%. The UF resin adhesive with modified NCC was characterized by X-ray powder diffraction (XRD), thermogravimetric analysis (TG) and Fourier transform infrared (FT-IR). The crystal region of UF resin adhesive was influenced by NCC and the diffraction intensity of the peak at 2θ = 22.82° was enhanced significantly. The thermal stability of UF resin adhesive with 1.0% modified NCC increased by 4.9%. And modified NCC led hydroxyl groups into the UF resin adhesive. HCHO emission and bonding strength of the UF resin adhesive with modified NCC were tested according to Chinese National Standards GB/T 17657-1999 and GB/T 9846-2004. The HCHO emission of fiberboard and plywood with 1.5% modified NCC decreased by 13.0% and 53.2%, respectively. The bonding strength of fiberboard increased by 158.3% (from 0.12 MPa of control group to 0.31 MPa of fiberboard with 1.5% modified NCC), while 1.5% modified NCC led to a 23.6% increase in the plywood.

Abstract: Mn-Ce-Fe Oxide catalysts were prepared by a co-precipitation method using precipitants NH4OH. The catalysts were characterized by Powder X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and BET study. It was found that the samples prepared with NH4OH as a precipitator show higher surface areas and s_{Subscript text}uperior catalytic performance at room temperature. The catalysts would reduce substantially indoor formaldehyde concentrations in the present of airstreams.

Abstract: 1) Upon comparing Ceramic products, which have been made into samples by the exactly same construction method as prefabbed wall of apartment, with the existing products, it is revealed that there would beno diminution effect on Pollutants like TVOC and HCHO. On the contrary, from the Ceramic applied prefab-wall, some pollutants, which were not seen from normal wall-panel, had been emitted additionally. 2) When we spreaded seven kinds of catalyst products on the surface of samples of MDF furniture and tested, two of those applied samples showed stronger tendency regarding the TVOC and HCHO emission than unapplied samples. Consequently, it is clarified that there's no effect of eliminating the pollutants like TVOC and HCHO from the application of catalysts as well as ceramic. In this regard, when we consider all the results collectively which were earned from these analysises up to now, using indiscreet after-treatment materials in residential place should be applied only after prudent examination.