- Preparation method of theic
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The invention relates to the field of organic chemical industry, in particular to a preparation method of tris (2-hydroxyethyl) isocyanurate. According to the method, a chloroethanol route is used, iodide ions are used as a catalyst, a proper feeding mode and a purification method are adopted, and the defects that the method is complex in process, long in reaction period and inconvenient in excessive recovery of chloroethanol are overcome. Iodine ions are used as a catalyst so that the temperature during the reaction of chloroethanol and cyanuric acid is reduced. Meanwhile, the equivalent chloroethanol is added in a dropwise adding manner so that the self reaction of the chloroethanol and the generation of impurities generated by the reaction of the theic and the chloroethanol are reduced,the operation is simple, the purification is convenient, and the industrial prospect is better.
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Paragraph 0041-0067
(2021/02/10)
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- Piperidyl organosiloxanes and polymer substrates light-stabilized therewith
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Novel piperidyl organosiloxanes, well adapted for the light/UV-stabilization of a wide variety of polymer substrates, e.g., polyolefins and polyalkadienes, have the structural formula (I): STR1
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- Application of the study of reactivity of alkaline salts of isocyanuric acid to the synthesis of mono and trisubstituted isocyanurates
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Reactivity of alkaline salts of isocyanuric acid has been studied. It has been established that the nucleophilic substitution is not selective because of the protonic exchanges between salts and substituted derivatives. The synthesis of mono or trisubstituted derivative is due to secondary reactions and to solvent effects. With this study, it has been possible to settle a method to prepare mono and trisubstituted derivatives of isocyanuric acid.
- Chiron-Charrier,Caubere
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p. 2659 - 2672
(2007/10/02)
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