| Various organosilicon-residues, which can be called high-boiling residues,low-boiling residues and abandon catalyst in synthesis of Methylvinyldichlorosilane,produce in the producing process of methylvinylcyclosiloxane. It would generates andreleases the corrosive gas of HCl, if it were exposed in the air. And it not only gives riseto a seriousness environment pollution, but also extremely wastes resource. Storingoutside, It can be burning spontaneously. And it would bring a serious hidden trouble ofthe life, assets, safety. The shortages of these, producing methylvinylcyclosiloxanewhich is an important step of organosilicon industry, have caused a maximum effect onthe development of industries. Therefore, it is extremely significance by researching therecycling utilizing technology of organosilicon residues. At last, The detail content ofthe study as following:1.The structure analysis of organosilicon by-products: Using elemental analyzer,energy-dispersive X-ray analysis and physical and chemical methods for qualitative andquantitative analysis, the elements of by-products are analyzed. The study has foundthat by-products consist of C, H, O, Si and Cl. Analysis the by-products by fouriertransform infrared(FTIR) spectroscopy and nuclear magnetic resonance(NMR)confirmed the formation of by-products’ groups. For example, foudingethenyl(-CH=CH2), methyl(-CH3), methylene(-CH2-), silicon-oxygen bond(Si-O-Si),et al. The result of the study indicated that residues is composed of the vinyl of thelinear-oligomer, two-dimensional and three-dimensional polymers.2.The property-testing of organosilicon by-products: It is not obvious phenomenonthat the samples was erosived. But it could be seen that the samples were slowlydissolved in the organic solution, especially, trichloromethane, xylene, phenixin et al,but not dissolved completely. It is a swelling character of the polymer.3.The study of thermal decomposition of organosilicon by-products: Comparingcurves of thermogravimetric analysis with a nitrogen atmosphere and air, Oxygenaccelerates the pyrolyzing reaction of the sample. On the contrary, the thermal stabilityof sample is promoted in a nitrogen atmosphere. The highest temperature of heatproofcan reach450℃. After1000℃burning, the content of samples’ash is tested at67.68%.Analyzing the sample by fourier transform infrared(FTIR) spectroscopy is found manycharacteristic absorption peaks before burning. The sample after burning can not appearthe characteristic absorption peaks at3055cm-1,2962cm-1,1597cm-1,1407cm-1,1259 cm-1and so on. And it just retains the peaks of Si-O-Si bond at1000~1100cm-1and790cm-1. Then, having been burned, samples transform into inorganic substance.4.The study of application of organosilicon by-products: Residues, which areregarded as the filter, are utilized to test the character of waterproof coating and siliconrubber. Coming to a consequence that it improves the waterproofness of coating, waterabsorbency rate drop to one five of the before. And its breathability is also well. It alsoenhances the reinforcing character of rubber, which is test, such as, tensile strength is15.5MPa, elongation at break is307%. While few silica is added in rubber systern, itcan be enhancing the reinforce of rubber. |
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