5 results about "Ene reaction" patented technology

The present invention belongs to the technical field of preparation of water reducers, and the present invention discloses a low-temperature early-strength water reducer and a preparation method thereof. The present invention obtains a polyester macromonomer by first subjecting the monomer obtained by amidation reaction and esterification reaction to Michael addition reaction, and then undergoes free radical polymerization reaction with polyether macromonomer, carboxylic acid small monomer and sulfonic acid small monomer, and then sequentially undergoes functional modification by Hofmann degradation reaction and amidation reaction, and then undergoes Thiol-ene reaction with thiolated trehalose to synthesize a low-temperature early-strength water reducer. The low-temperature early-strength water reducer prepared by the present invention has the advantage of maintaining good dispersibility under low-temperature conditions, and the synthesis process is controllable, energy-saving and environmentally friendly, and can be effectively used in the field of concrete to solve the problems of poor concrete working performance and slow early strength development under low-temperature conditions, and has broad application prospects.

The application discloses a continuous Saucy-Marbet ketonization reaction process of allyl alcohol compounds. Specifically provided is a preparation method of compound II, which comprises the following steps: reacting compound I and 2-methoxy propylene in the presence of an acid in a tubular reactor to generate compound II; and the acid is added in the following manner: in the first stage, the molar ratio of the acid to the compound I is 0.005-0.015; in the second stage, the molar ratio of the acid to the compound I is 0.006-0.020; and in the third stage, the molar ratio of the acid to the compound I is 0.009-0.025. The preparation method disclosed by the application has one or more of the following advantages: (1) high yield, (2) high purity, (3) few side reactions, (4) simple operation and (5) low cost.

The invention belongs to the technical field of organic silicon chemistry and surfactants, and provides anionic silicon resin as well as a preparation method and application thereof in order to solve the problem that a traditional organic silicon surfactant is mainly non-ionic and is easy to hydrolyze. (Me3SiO0.5) a (R2Me2SiO0.5) b (Me2SiO) c (R2MeSiO) d (MeSiO1.5) e (R2SiO1.5) f (SiO2) g, in which a is 4 to 20, b is 0 to 15, c is 2 to 30, d is 0 to 15, e is 4 to 25, and f is 6 to 20; g is 20 to 50; r2 is (CH2) n + 1S (CH2) m + 3R1M, and R1 is SO3 <->, PO32 <-> or COO <->; m is Na < + >, K < + > or NH4 < + >; n = 0 or 2; and m = 0-9. The silicon resin is prepared by sulfydryl-alkene reaction, and has the core of silicon resin and excellent surface activity.

The invention belongs to the technical field of organic silicon polymer materials, and provides cationic organic silicon: (Me3SiO0.5) a (R2Me2SiO0.5) b (Me2SiO) c (R2MeSiO) d (MeSiO1.5) e (R2SiO1.5) f (SiO2) g, a being 7-12, b being 0-10, c being 4-30, d being 2-15, e being 4-15 and f being 6-30, aiming at the problems of poor hydrolysis resistance and antibacterial property of the existing organic silicon. G is 30 to 50; r2 is (CH2) n + 1S (CH2) m + 3R1M, and R1 is + N (CH3) 3, + N (C2H5) 3, + N (CH3) 2CH2CH2OH, a pyridine cation or an imidazole cation; m is Cl <->, Br <->, I <-> or BF4 <->; n = 0 or 2; and m = 0-9. And the sterilization effect can be improved by adopting sulfydryl-alkene reaction for preparation.