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The Application And The Synthesis Of Nanometer Zinc Borate Via Cooridination Homogeneous Precipitation Method

Posted on:2009-10-27Degree:MasterType:Thesis
Country:ChinaCandidate:T ChenFull Text:PDF
GTID:2121360245490270Subject:Applied Chemistry
Abstract/Summary:PDF Full Text Request
Inorganic flame retardant has become the goal of flame retardant beacanse of its fine property. Moreover, their action as smoke suppressants, afterglow suppressants, corrosion inhibitors, and synergistic agent has been pointed out. Zinc borate is a new type of inorganic flame retardant, which is also a series of compound of B and Zn oxide. Previous studies have demonstrated that they are commonly used as flame-retardant filler in PVC, PP, polyamides, epoxy resins, etc. The nano-sized particle and uniform dispersion is the trend of this kind of flame retardant.A new method, namely, coordination homogenious precipitation method was described to synthesize nanometer zinc borate powders with different shapes. Transmission electron microscope(TEM), powder X–ray diffraction(XRD), thermal analysis(TG-DTA), infrared absorption spectroscopy(IR), differential scanning calorimetry(DSC) were used to characterize the microstructure and morphology of the products, the surface modification of the product was studied in this paper, and the application of nanometer zinc borate as flame retardant was also investigated preliminarily.A new nano 2ZnO·2.2B2O3·3H2O (ZnO%=44.31%, B2O3%=40.92%, H2O%=14.77%), was prepared via coordination homogeneous precipitation method using zinc nitrate and borax as raw materials. The product appeared to have a flake-like shape and with the particle size of around 100–200nm; and a netlike nano zinc borate ZnO·yB2O3·zH2O (y=0.30.4, z=1.01.4) was prepared using zinc oxide and boric acid as raw materials, the product were composed of fibers with diameter about 15nm and length about hundreds of nanometers, some of which entangled each other to form dendritic or interconnected networks.Surface modification of the product (2ZnO·2.2B2O3·3H2O) was carried out using sodium dodecyl benzene sulfonate (SDBS) in this paper. It revealed that the zinc borate after modification transferred from hydrophilisity to lipophilicity, and the dispersion of the nanosized particles was greatly improved when they were modificated.The pilot study revealed that the product had better char formation effect than the commercial ZB2335 when it was introduced into polypropylene (PP) and high-density polyethylene (HDPE) as flame-retardant filler. The carbon residue ratio of PP and HDPE were about 65% when the sample content was about 12wt %.
Keywords/Search Tags:nanometer material, zinc borate, coordination homogenious precipitation method, surface modification, flame retardant performance
PDF Full Text Request
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