36results about How to "Controllable molecular structure" patented technology

The invention provides a block poly-carboxylic acid concrete high-efficiency water reducing agent with an ordered structure and a preparation method thereof. The block poly-carboxylic acid is prepared by using atom transfer radical polymerization, the structural regularity and the molecular weight distribution of the poly-carboxylic acid are controlled effectively, and the water reducing agent is used in a cement dispersing process. By adoption of the block poly-carboxylic acid concrete high-efficiency water reducing agent and the preparation method thereof, the problems of uncontrollable molecular weight of the poly-carboxylic acid, wider molecular weight distribution, un-designable molecular structure and the like are solved.

The invention provides a fluorine-containing waterproofing agent for textiles and a method for preparing the same, belonging to the chemical material field. A self-emulsifying fluorine-containing acrylate block copolymer is synthesized by means of ARGETATRP (Activators Regenerated by Electron Transfer for Atom Transfer Radical Polymerization); and the self-emulsifying fluorine-containing acrylate block copolymer can be directly used after being emulsified and diluted. The self-emulsifying fluorine-containing acrylate block copolymer prepared by the method has excellent pH stability, chemical stability, diluting stability and storage stability; and the fluorine-containing structure units are distributed in form of blocks on the polymeric chain of the fluorine-containing acrylate block copolymer so that the fluorine-containing chain segments can be effectively utilized. Compared with a random fluorocarbon resin, the fluorine-containing acrylate block copolymer is capable of achieving the same performance and the usable amount of fluorine-containing monomers is very low. Moreover, textiles finished by the fluorine-containing waterproofing agent have excellent waterproofness; and compared with the similar products, the fluorine efficiency is improved and the cost is reduced.

The invention relates to a three-arm efficient water reducing agent and a preparation method thereof, and belongs to the technical field of building concrete additives. The efficient water reducing agent is prepared through the step that an AB-type double-block copolymer of a three-arm structure is obtained through step-by-step polymerization by adopting three atom transferring radical polymerization reaction steps. The water reducing agent has the advantages of being controllable in chemical structure and molecular weight, narrow in molecular weight distribution and simple in process, is high in water reducing rate and good in slump retaining property, can obviously improve the concrete flowability and is low in sensitivity degree to mud. Compared with a traditional comb-shaped polycarboxylic water reducing agent, the problems that the polycarboxylic water reducing agent is sensitive to the mud in concrete, and the performance is reduced due to existence of the mud can be solved to a certain degree, and the three-arm efficient water reducing agent is especially suitable for the concrete with the high mud content.

The invention discloses long-chain alkyl phenyl fluorosilicone oil and a preparation method thereof. The preparation method comprises the following steps: under the protection of inert gas, a self-made polyfunctional group substituted hybrid siloxane ring body is used as a reaction raw material, a corresponding end-capping reagent is added, and a strong acid or strong base ring-opening reaction is carried out to prepare high-molecular-weight long-chain alkyl phenyl fluorosilicone oil. The preparation method is low in cost and mild in reaction condition, the molecular structure and organic group content of the product are easy to control, the organic group in the synthesized product is more uniform in distribution, the synthesized product is low in viscosity and good in heat resistance, and the lubricating property requirements within a wide temperature range are met; at the same time, the long-chain alkyl phenyl fluorosilicone oil can be used as an additive and used in a compounding manner with the synthetic oil or mineral oil, so that the lubricating properties of the synthetic oil or mineral oil are improved.

The invention discloses a method for preparing water-soluble graft polymers through active/controllable radical polymerization. The method can be used for controllable radical polymerization of various water-soluble monomers of a (methyl) acrylamide monomer, (methyl) acrylic acid, (methyl) acrylate and the like, so as to prepare the water-soluble graft polymers with different molecular weights. The preparation method is particularly realized through the following steps: firstly, preparing a water-soluble polyfunctional macroinitiator by adopting a chemical modification manner; secondly, initiating active/controllable radical polymerization of the water-soluble monomers by the macroinitiator under the heating or visible light/ultraviolet light irradiation condition, and preparing the molecular weight and chemical constitution controllable water-soluble graft polymers. The method is simple in synthetic route, low in production cost and safe and convenient to operate; the prepared macroinitiator is high in dissolution rate in water phase and high in initiating activity, and can be used for preparing the chemical constitution and molecular weight controllable water-soluble graft polymers.

The invention provides a high molecular weight unsaturated polyether macromonomer which is characterized in that the polyether macromonomer is at a liquid state at normal temperature, and the structural formula (I) thereof is expressed in the specification, wherein R<1> is same or different, and represents a hydrogen atom or alkyl with 1-20 carbon atoms; R<2> represents alkyl with 1-20 carbon atoms; R<3> represents alkyl or carbonyl with 1-10 carbon atoms; R<5> represents a hydrogen atom or alkyl with 1-20 carbon atoms; R<4>O is different, and represents oxyalkenyl with 2-18 carbon atoms; n represents the average addition mole number of the oxyalkenyl, and 5<=n<=300; and X, Y and Z are same or different, and represent -N, -O or H. By optimally designing the molecular structure, the high molecular weight unsaturated polyether macromonomer provided by the invention ensures the liquid state thereof at normal temperature while the molecular polymerization reaction activity is ensured. Besides, a preparation method of the high molecular weight unsaturated polyether macromonomer provided by the invention is simple, and the conditions are easy to control; and the product does not need slicing post-treatment, the production cost is low, and the economic benefits are increased.

The invention provides a semi-aromatic polyamide polyester copolymer, which is characterized in that: the structural formula of the semi-aromatic polyamide polyester copolymer is (AB)n, wherein m1 is an integer from 1 to 500; m2 is an integer from 1 to 500; and n is an integer from 10 to 500. The invention also provides a method for preparing the semi-aromatic polyamide polyester copolymer. The semi-aromatic polyamide polyester copolymer has high heat resistance, water absorbability and mechanical properties; and the preparation method is simple, molecular structures are controllable, a few side reactions are carried out, and the conversion rate of the product is high.

The invention discloses a preparation method of monoethanol diisopropanolamine. The monoethanol diisopropanolamine is prepared by mixing and reacting diisopropanolamine and epoxyethane in a reaction kettle. The method does not adopt the traditional synthesis reaction of liquid ammonia with epoxyethane and epoxypropane, but creatively reacts the raw material diisopropanolamine with epoxyethane to obtain the product. The invention has the advantages of high yield, short reaction time, mild reaction conditions and controllable process; one active position on the ammonia molecule is substituted by epoxyethane, so that the molecular structure of the product can be controlled more easily; and by using the high-content diisopropanolamine as the raw material, the product has better smell, color and reaction time than that of an ammonia process.

The invention relates to a polyquinoline polymer material and a preparation method thereof, and belongs to the field of polymer material preparation. The structural formula of the polymer is shown indescription, wherein R1 refers to an aromatic ring functional group without strong electron absorption, R2 refers to an aliphatic functional group and n refers to an integer selected from 3 to 80. Thepreparation method of the polyquinoline polymer material includes the following steps that, an alkyne-aldehyde derivative monomer, an aniline derivative monomer, a catalyst and a solvent are added ina reaction container, reaction is conducted at 80-120 DEG C for 12-48 minutes, the mixture is cooled to the room temperature, and an intermediate product is obtained; the intermediate product is added in a precipitation agent to obtain a precipitate, filtration and drying are conducted, and the polyquinoline polymer material is obtained. The polymer is directly obtained by one step, no metal catalysts are needed in the reaction process, the reaction condition is mild, the strict water-free and oxygen-free condition is not needed, operation is simple, and the material is easy to synthesize.

The invention discloses a preparation method of a three-arm block polycarboxylic acid water reducing agent. The preparation method comprises that triol, an alkali, CS2 and benzyl bromide in a molar ratio of 1: 3-4: 2-5: 2-7 undergo a reaction to produce a three-arm chain transfer agent, under the action of the three-arm chain transfer agent and an initiator, isoamyl alcohol polyoxyethylene ether and acrylic acid undergo an RAFT polymerization reaction to produce a three-arm block compolymer, and the compolymer is treated to form the three-arm block polycarboxylic acid water reducing agent. Thewater reducing agent has a controllable chemical structure, controllable molecular weight, narrow molecular weight distribution, simple processes, a high water-reducing rate and good moisture retention effects, can obviously improve concrete fluidity, has low sensitivity to mud, can meet higher construction requirements and has broad application prospects.

The invention relates to the field of polymers and discloses an H-shaped polymer and a preparation method thereof. The method for preparing the H-shaped polymer comprises the following steps: (1) a first monomer is subjected to bidirectional anionic polymerization in the presence of a double anion initiator and a solvent, an end-capping reaction is performed with an epoxy compound, dihalo acyl halide is added for an acylation reaction, and a prepolymer is obtained; (2) in the presence of a catalyst and a complexing agent, the prepolymer is used for initiating an active free radical polymerization reaction of a second monomer. The H-shaped polymer with controllable molecular structure and controllable molecular weight can be prepared through conversion from bidirectional anionic polymerization to the active free radical polymerization reaction.