- Preparation method of tetrabromobisphenol S bis(2,3-dibromopropyl ether) flame retardant
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The invention provides a preparation method of a tetrabromobisphenol S bis(2,3-dibromopropyl ether) flame retardant. Bisphenol S used as a raw material and chloropropene undergo a substitution reaction to obtain a bisphenol S diallyl ether intermediate, and the bisphenol S diallyl ether and liquid bromine undergo addition and substitution reactions to obtain tetrabromobisphenol S bis(2,3-dibromopropyl ether). One-time bromination is adopted to introduce all eight bromine atoms into an aromatic ring and a side chain at the same time, so that the process route is shortened, the operation is simple, the safety is high, and the production cost is low. A solvent can be recycled in the process of preparing the bisphenol S diallyl ether intermediate, and the output of three wastes is greatly reduced, so the pollution to the environment is reduced, and the production cost is saved. The tetrabromobisphenol S bis(2,3-dibromopropyl ether) flame retardant prepared in the invention has high productpurity and improved application quality.
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Paragraph 0028; 0054-0065; 0066; 0069-0070
(2020/04/29)
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- Preparation method for octabromo S ether
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The invention relates to a preparation method for octabromo S ether. The invention aims to solve the technical problems of high process cost, low yield, long reaction route and high risk of the synthesis method for octabromo S ether in prior art. The prep
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Paragraph 0031; 0036-0038; 0043-0045; 0050-0052; 0057-0059;
(2019/07/01)
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- Bromine compound production method
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Method of producing a bromine compound having an aliphatic unsaturated bond which includes reacting a compound having an aliphatic unsaturated bond represented by the following general formula (1) with bromine: to produce a bromine compound represented by the following formula (2): wherein Ar1, Ar2 and Y are the same as defined in the above general formula (1) , and R3 and R4 are groups obtained by saturating the unsaturated groups of R1 and R2 in the above general formula (1) with bromine, respectively. The reaction is carried out in the presence of a solvent which is inactive in the reaction, and a substantial amount of the heat of reaction is removed from a reaction system by the vaporization of the solvent or bromine. A high-purity bromine compound in high yield which is useful as flame retardant, can be obtained.
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- Bromine compound production method
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A high-purity bromine compound which is useful as flame retardant, can be obtained industrially advantageously by a process comprising reacting bromine with an aliphatically unsaturated compound of formula (1) : R1-O-Ar1-Y-Ar2-O-R2to produce a bromine compound of formula (2): R3-O-Ar1-Y-Ar2-O-R4wherein in each formula Ar1and Ar2are independently a C5-16aromatic hydrocarbon or a C5-12saturated alicyclic hydrocarbon, and Y is a C1-6saturated hydrocarbon, a sulfone, sulfide, ketone or C2-6alkylene oxide or is a single bond; R1and R2are each independently a C2-11hydrocarbon group which is at least partially unsaturated; and R3and R4are groups obtained by saturating with a bromine atom the unsaturated groups of R1and R2respectively, wherein the reaction is carried out in the presence of a solvent which is inactive in the reaction, and a substantial amount (e.g. 80% or more) of reaction heat is removed from the reaction system by the vaporization heat of the solvent or bromine.
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- Isolation and identification of tetrabromobisphenol-S-bis-(2,3-dibromopropyl ether) as flame retardant in polypropylene
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Approximately 4% tetrabromobisphenol-S-bis-(2,3-dibromopropyl ether) and 0.44% antimony were found in the back wall of a TV cabinet. This is the first time a bromoorganic name retardant containing a sulfur linkage has been detected. No such compound has been previously mentioned in the analytical or environmental literature. Isolation from PP was performed by extraction and precipitation of coextracted polymer. After chromatographic separation (TLC, CC), the combination of 1H/13C-NMR, MS (EI), FT-IR and HPLC (UV/Vis, DAD and MS) indicated the TBBP-S derivative, which was verified by synthesis of reference material.
- Dettmer,Wichmann,De Boer,Bahadir
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p. 1523 - 1532
(2007/10/03)
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