6results about How to "High monomer conversion rate" patented technology

The invention relates to the technical field of building materials, in particular to a composite functional polycarboxylate superplasticizer with high synthesis conversion rate and a preparation method thereof. The molecular structure of the polycarboxylate superplasticizer is optimally designed from an initiation mechanism and raw materials to prepare the polycarboxylate superplasticizer with a novel molecular structure, so that the polycarboxylate superplasticizer has the characteristics of high monomer conversion rate and functional compounding; therefore, the product energy efficiency is improved, and the common problems of poor adaptability to concrete materials, sensitivity to the mixing amount and the like of the conventional polycarboxylate superplasticizer product at present are solved. Unsaturated functional active monomers containing structures such as carboxyl, carboxylate group, hydroxyl, double benzene rings, phosphate group, amide group, disilane and sulfonic acid group are introduced in molecular synthesis of the polycarboxylate superplasticizer, so that the synergistic effect of the monomers is fully exerted, and the multifunctional composite effect of the polycarboxylate superplasticizer is realized.

The present application relates to the technical field of polymer preparation, and in particular to a preparation method and application of a styrene acrylate polymer emulsion, the preparation method comprising the following steps: S1, adding a reactive cationic emulsifier into deionized water to obtain an emulsifier solution; S2, mixing styrene, acrylate, a co-stabilizer and an initiator, then adding the mixture into the emulsifier solution, ultrasonic treatment, and reacting at 60-70 DEG C for 5-7 h under the protection of inert gas to obtain the styrene acrylate polymer emulsion. The monomer conversion rate of the preparation method is high, the particle size distribution of the obtained styrene acrylate polymer emulsion is uniform, and the application range is wide.

The present invention provides a method for preparing polyvinyl alcohol with high polymerization degree by aqueous phase precipitation polymerization, wherein polyvinyl acetate is prepared by aqueous phase precipitation polymerization, and then the prepared polyvinyl acetate is subjected to alcoholysis to obtain polyvinyl alcohol with high polymerization degree; wherein the polyvinyl acetate is prepared by aqueous phase precipitation polymerization, wherein vinyl acetate and azobisisobutyronitrile are mixed as a mixed solution, and then the mixed solution is dripped into deionized water, the reaction temperature is maintained during the dripping process, and the reaction is continued to be stirred after the dripping is completed, and the solid product is collected to obtain polyvinyl acetate with high polymerization degree. The polyvinyl acetate polymerized product of the technical solution of the present invention is directly precipitated in water, and polyvinyl acetate with high polymerization degree can be obtained without post-treatment steps such as precipitating agent or removing organic reagent, and also has a significantly higher monomer conversion rate.

The application provides polybutene-1 and a preparation method thereof, a non-metallocene catalyst used in the preparation method and a preparation method of the non-metallocene catalyst, and the non-metallocene catalyst comprises the following formula I structure: wherein R1 and R2 are selected from hydrogen and a hydrocarbon group with 1-10 carbon atoms, R1 and R2 are the same or different, R3 is selected from hydrogen and a hydrocarbon group with 1-10 carbon atoms, R4 is selected from a methyl group, an ethyl group and a n-propyl group, and Ar is a phenyl group, a naphthyl group, a phenyl group substituted with an aliphatic hydrocarbon group or a naphthyl group substituted with an aliphatic hydrocarbon group. The non-metallocene catalyst of the application has a bridged pyridyl amine hafnium structure, is used for catalyzing synthesis of polybutene-1, has high catalytic activity, high monomer conversion rate, and the prepared polybutene-1 has high stereoregularity and narrow distribution.

The invention provides a dynamic micro-interface polymerization method of a two-dimensional polymer material and application of the dynamic micro-interface polymerization method in preparation of a quasi-solid electrolyte, and the dynamic micro-interface polymerization method comprises the following steps: adding a first reaction monomer into a solvent, and stirring to obtain a first monomer solution; adding a second reaction monomer into the solvent, and stirring to obtain a second monomer solution; adding the second monomer solution into the reaction container, injecting the first monomer solution into the second monomer solution under a stirring condition, and reacting to obtain a mixed system; and carrying out suction filtration, purification and drying on the mixed system to obtain the two-dimensional polymer material. According to the dynamic micro-interface polymerization method disclosed by the invention, a dynamic micro-interface reaction system with a huge specific surface area is constructed through external mechanical stirring, and a reaction place is expanded from a limited two-dimensional plane to a massive micron-scale interface in a three-dimensional space, so that the core defect of insufficient interface area in static interface polymerization is fundamentally overcome.

The invention discloses a solid-phase tackifying method and system for polyester. According to the solid-phase tackifying method of the polyester, the polyester polymer passes through the crystallization preheater and then is introduced into the polycondensation tower for solid-phase tackifying, while negative pressure is pumped into the polycondensation tower, process gas is continuously introduced in the whole solid-phase tackifying process, and under the action of the negative pressure, the flow rate of the gas entering the polycondensation tower is increased, so that the solid-phase tackifying effect is improved. Not only is the use amount of process gas saved, but also micromolecular monomers and oligomers can be taken away by gas flow, so that the purpose of quickly removing micromolecules is achieved, and the polymers grow towards the chain growth direction; the process gas flowing out of the polycondensation tower enters the gas purification device, the process gas with small molecules is subjected to spray cooling and gas-liquid separation through the gas purification device, monomers and oligomers are removed from the process gas and recycled, the process gas is purified, and the purified process gas can return to the gas supply port for cyclic utilization.