Study On Modification Of Aluminum Hydroxide And Its Application In Fire-retardant Polypropylene

This paper is about to study on the surface modification of aluminum hydroxide and its application of flame retardant polypropylene,using contact angle, bulk density, particle size distribution analyzer, Energy Dispersive Spectrometer (EDS), X-ray powder diffraction (XRD), thermal gravimetric analysis(TG), Scanning Electron Microscope (SEM) and Fourier Transform Infrared Spectroscopy (FTIR), and other modern means of characterization tests to characterize the modified ATH. Finally, studying the effect of the modified ATH and with intumescent flame retardant for PP flame retardant effect and mechanical compatibility.The main contents and research results are as follows:1. Class of surfactant modification of ATH by wet process conditions was investigated. The results showed that the amount of such modifier, modifying temperature and time conditions have a significant influence on the modification effect of ATH, and there are differences between the surfactants of Span and the corresponding optimum conditions,especially S-60 which as a modifying agent, could been got the best modifying effect of ATH by an amount of 0.03 (the weight ratio of ATH), reaction temperature was 85℃, reaction time was 60 min. By modifying, ATH particle size distribution becomes more uniform, the surface wettability of the particles changes from hydrophilic to lipophilic. From analysis of these samples, the surface modification of ATH by the surfactants of Span are mainly achieved through physical adsorption, so the chemical structure of ATH has not changed, and the thermal stability is not significantly.2. Using melamine formaldehyde resin as wall material, the use of in-situ polymerization on the ATH-coated microcapsules were modified. The results show that, when the core wall ratio is 1:1, a temperature of 70℃,3% of emulsifier OP-10, maintaining the stirring rate 1000 r/min, after 2h the coating treatment, the particle size can be prepared distribution, and high thermal stability of the microcapsule-coated aluminum hydroxide (MFATH-g)3. Compared to unmodified ATH, the modified ATH and intumescent flame retardant PP compound was used as a flame retardant additive, after testing, flame retardant and mechanical compatibility can be significantly improved Especially,using MFATH-g, ammonium polyphosphate (APP) and pentaerythritol (PER) as a flame retardant additive system, when the ratio of the three is 1:1:1, total addition amount of 30%, limiting oxygen index (LOI) of PPcan be increased to 28.5%, the tensile strength of 21.675 MPa, and basic smokeless combustion generates.These can been able to meet the needs of certain areas.