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Chlorination of Model of Natural Rubber Latex 2-Methyl-2-Butene

Author: XingMingXiang
Tutor: ChenYongPing
School: Hainan University
Course: Materials Science
Keywords: 2 - methyl -2-butene 2 - methyl -2 - butene emulsion Chlorination Infrared Spectroscopy GC-MS analysis
CLC: TQ330.1
Type: Master's thesis
Year: 2011
Downloads: 5
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Abstract

Chlorinated rubber (CR) is made by the chlorination reaction in the degradation of the natural rubber or synthetic rubber by a white or pale yellow powder. According to the provisions of the Montreal Protocol, the production of carbon tetrachloride as a solvent, chlorinated rubber has been completely eliminated. Are using advanced technology abroad, mainly represented by Japanese manufacturers in the water phase chlorination technology and the German company Bayer solvent exchange technology and China Fenghua the Yulon Chemical's water phase chlorinated rubber technology. Bayer AG, Germany have adopted this technology in 1996, and the annual output reached 10,000 tons. And our breakthrough in this technology in recent years and there is the annual output is not high drawbacks. According to the survey, is now all of our manufacturers actual annual output of less than 2,000 tons, while the country's annual requirement of nearly 10,000 tons. The latex Law process is simple, little pollution and low cost outstanding advantages, shows strong vitality and bright prospects for development. Therefore, the use of natural latex as a raw material for the production of an important impact on the the chlorinated rubber industry in China. In this thesis, mainly small molecule model compounds of natural rubber latex, 2 - methyl-2 - butene emulsion chlorinated of simulated natural latex chloride process, simplify the research system, in-depth system affecting the main factors of natural latex chlorination reaction, the use of modern analytical tools to track its chlorination process analysis, proven chlorinated products of different stages. First, prepare a stable 2 - methyl -2 - butene-emulsion, in order to adequately simulate the environment of the natural rubber latex, the main factor is the choice of an emulsifier extremely dosage. The comparison of the two non-ionic showed Tween 80 and peregal 0 Tween 80 as the best option. Through the influence of the chlorine content of the chlorinated products on temperature, time, and presence or absence of ultraviolet irradiation, to identify suitable conditions allowing the chlorine content of the product reached about 65 percent. Reaction temperature of 50 ° C, the reaction time up to 7 hours of UV irradiation conditions can reach about 65% of the industrial production of chlorinated natural rubber. Different stages chloride 2 - methyl-2 - butene emulsion infrared spectroscopy, we know its chlorinated products are very complex. Absorption peak at 2874 cm-1 at the absorption peak of the C (O)-H at 3560 cm-1-OH absorption peaks in 1725 cm-1 rear left at the characteristics of the carbonyl group-containing chlorinated product a large number of aldehydes, ketones and esters, also can see that there are three peaks at 650cm-1 ~ 800 cm-1, is chlorine in the characteristic peaks in the primary, secondary and tertiary carbon. And 2 - methyl -2 - butene different stages chloride Infrared Spectra comparative analysis can be known, 2 - methyl-2 - butene to the chlorinated product and found no C = O, C (O) - H and-OH of the characteristic absorption peak at 650cm-1 ~ 800 cm-1, there are also three absorption peaks, its reaction and the oxidation reaction or oxidation occurs rarely. The analysis of the results of the 2 - methyl-2 - butene and 2 - methyl-2 - butene emulsion of different chlorination stage product temperament. The gas chromatogram and MS detection result can be: at the 2 - methyl -2 - butene Chloride initial emulsion, even at a lower temperature, the reaction is fast, in the initial chlorination substitution reaction accompanied by the transfer of the C = C bond, after the transfer of the product may continue to occur chloride, but will occur with the number of oxidation, therefore, most of the double bonds will break or oxide chloride, or chlorinated. Emulsion 2 - methyl -2 - butene as the double bond-containing material there are also the generation of cleavage products. Some double bonds and is not broken, but oxidation has occurred and generates a carboxyl group or ester material. Through the 2 - methyl -2 - butene chlorinated product comparison shows that, although the material of the pure organic phase there are ketones, aldehydes, but should be small, to see in the infrared spectrum. But equally has Chloride substituted, and is accompanied by a transfer of the double bond, as well as the breakage of a double bond. Product in more depth chlorination chlorination. But its stability than the emulsion method chloride 2 - methyl-2 - butene better.

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