78results about How to "Fast polymerization" patented technology

The invention discloses a hydroxymethyl acrylamide-acrylate copolymer toughened and modified polylactic acid material and a preparation method thereof. The hydroxymethyl acrylamide-acrylate copolymer serving as a toughening agent accounts for 5 to 15 percent of the weight of the material; and the material is a transparent material of which the tensile strength is 36 to 50Mpa, the breaking elongation is 40 to 350 percent, and the Izod impact strength is 5 to 17KJ / m<2>. The invention also discloses a method for preparing the polylactic acid material. Because the hydroxymethyl acrylamide-acrylate copolymer serving as the toughening agent can form a fine granular disperse phase in polylactic acid to play a role in toughening similar to rubber particles, the material has the advantages of small additive amount, high toughening efficiency, little influence on the strength, high machining flowability, transparency, rigidity and heat resistance, quick polymerization reaction, short productioncycle, simple process control, low cost and easy industrial popularization and application.

The invention relates to the technical field of silicone rubber production, in particular to a continuous production system and production method of polysiloxane. The continuous production system of polysiloxane comprises: a pre-mixer; a polymeric twin-screw extruder connected to the discharge port of the pre-mixer; The first vacuum system that links to each other; the static mixer that links to each other with the discharge port of described polymerization type twin-screw extruder; The second vacuum system connected to the vacuum port of the strip-type devolatilizer; the devolatilization type twin-screw extruder connected to the outlet of the strip-type devolatilizer; the devolatilization type twin-screw extruder The third vacuum system connected to the vacuum port of the extruder. The final polysiloxane produced has higher viscosity and lower volatile content.

The invention relates to a green preparation method of a vinyl chloride / butyl acrylate copolymer used as a thermoplastic elastomer. The preparation method is based on a synthesis technology of a copolymer formed by interfacial free-radical polymerization of water / oil two-phases. Based on a copolymer synthesis technology through water / oil two-phase interfacial free-radical polymerization, a polyhydroxy polyamine surface active initiator and potassium persulphate are subjected to an oxidation reduction reaction at normal temperature, free radicals are repeatedly generated on the interface and independent polymerization of vinyl chloride and butyl acrylate is initiated. Through molecules of the initiator, two chain segments are connected in series so as to form a poly-segment copolymer. It is proved through experiments that pH of an aqueous medium is within the range of 4-4.5, feed ratio of a monomer is very consistent with composition ratio of the copolymer and content of the butyl acrylate chain segments in the copolymer is adjustable within the range of 10-42wt%. According to the mode of polymerization reaction, conditions are mild and controllable, energy consumption is low, other organic solvents or emulsifiers are not used, and the product is pure. The method completely meets the requirement of green chemistry.

The invention relates to an anionic surface active initiator and a preparation method thereof. The method comprises the steps that a tertiary amine compound containing sulfonate anion and dodecyl is synthesized, and the tertiary amine compound itself is surfactant; meanwhile, tertiary amine and potassium persulfate can be subjected to an oxidation-reduction reaction at room temperature, cationic free radicals are formed on nitrogen atoms and converted into carbon free radicals at adjacent positions, free radical generation can be repeated multiple times and controlled flexibly, multiphase concatenated polymerization of styrene and butyl acylate and styrene and acrylamide is initiated successively on a water or oil interface, and a segmented copolymer is obtained. It is provided through experiments that the feed ratio of a monomer and the component ratio of the copolymer are very consistent, it is illustrated that the initiation efficiency of the initiator is high, the polymerization reaction condition is mild and controllable, the energy consumption is low, other organic solvents and emulsifiers are not used, the product is pure, and the requirements of green chemistry are completely met.

The invention discloses a cationic polymerization method for vinyl monomer. In the method, a reaction medium, the vinyl monomer, an initiator, lewis acid and an additive are used, wherein the reaction medium is a mixed reaction medium comprising an organic solvent and water or completely water; the organic solvent is at least one selected from alkane, naphthenic hydrocarbon and halogenated hydrocarbon; the lewis acid is one or a mixture of substances which accord with a general formula of MXn or YRn-mXm; the additive is an oxygen atom and nitrogen atom-containing organic compound; the molar ratio of the lewis acid to the additive to the monomer is 1.0*10<-3> to 3.2*10<-2>:1.0*10<-3> to 3.0*10<-1>:1; and the materials are reacted at the temperature of between -100 and 50 DE C for 0.5 minute to 2 hours to form a polymerization product, namely polymer with molecular weight of 10<5>. The method can simplifies the process flow, saves the production cost, and has great significance and considerable market application value.

The invention relates to a bisbenzenesulfonate interface initiator and a preparation method thereof. Synthesize a tertiary amine compound containing bisbenzenesulfonate anion and didodecanyl, so that it exhibits the characteristics of a surfactant. At the same time, the tertiary amine can undergo a redox reaction with potassium persulfate at room temperature. Cationic free radicals are formed on the surface, and then converted into carbon free radicals at adjacent positions. The generation of free radicals can be repeated many times, flexibly controlled, and multi-phase series polymerization is realized. Styrene and acrylic acid are initiated sequentially on the water / oil interface. Polymerization of butyl ester and styrene and N,N-dimethylacrylamide to obtain a multi-block copolymer. Experiments have proved that the feed ratio of the monomer is very consistent with the composition ratio of the copolymer, indicating that the initiator has a higher initiation efficiency. , the polymerization reaction conditions of this mode are mild and controllable, the energy consumption is low, no other organic solvents and emulsifiers are used, and the product is pure, which fully meets the requirements of green chemistry.