58results about How to "The polymerization reaction is easy to control" patented technology

The present invention discloses a macromolecule bonding agent and a preparation method thereof, and belongs to the technical field of chemical synthesis and propellant applications, wherein the obtained product can be adopted as a propellant bonding agent. According to the present invention, N,N-dicyanopropyl aminoethyl acrylate, methyl methacrylate, butyl acrylate and hydroxyethyl acrylate are subjected to copolymerization, wherein a copolymer function chain contains two cyanoalkyl groups, such that an absorption effect is strong; during product preparation, a reactivity ratio of the function monomer is close to reactivity ratios of other copolymerization monomers, such that the reaction is easily controlled; a good bonding effect can be achieved in propellant applications so as to provide a good mechanical property; and advantages of easily-obtained raw materials, easily-achieved preparation process and easy promotion and application are provided.

The invention discloses a method for preparing a starch graft cationic type hyperbranched vinyl or allyl amide polymer. The method comprises the following steps: preparing a mixed phase and a branching reagent phase, preparing a cationic monomer phase, gelatinizing the mixed phase at 25-95 DEG C for 0.1-1 hour, and adjusting the temperature to 40-80 DEG C; then adding a reversible addition-fragmentation chain transfer (RAFT) agent in the gelatinized mixed phase, adding an initiator to initiate a polymerization reaction; and finally adding the cationic monomer phase in a hyperbranched polymer system prepared from the mixed phase, and continuously reacting for 1-24 hours to obtain the starch graft copolymerization cationic type hyperbranched vinyl or allyl amide polymer. The method adopts the RAFT polymerization method and the semi-continuous polymerization technology and uses the diene monomer and the chain transfer agent with a low molar ratio to prepare the starch graft cationic typehyperbranched vinyl or allyl amide polymer in a polar solvent system with high polymerization rate and conversion rate, the polymerization reaction is easy to control and the turbidity removal effectof the product is remarkable.

The invention relates to a preparation method of a methyl methacrylate-styrene copolymer. Firstly, 40-100 parts of main monomer methyl methacrylate, 5-60 parts of comonomer styrene, 10*10<-4>-150*10<-4> part of initiators and 0.1-0.5 part of chain transfer agents are taken and fully stirred till mixtures are evenly mixed, the mixtures are added into a reactor provided with a backflow condensation device, then oil-bath heating and temperature raising are performed, the reaction temperature is controlled between 90 DEG C and 150 DEG C, a reaction lasts for 7-11 h at the rotation speed of 300-500 r/min, a thick copolymer is formed, and finally the methyl methacrylate-styrene copolymer is formed through sedimentation, filtration and drying. According to the preparation method, polymerization is performed in a one-time feeding mode, operation is easy, a polymerization reaction is easy to control, a whole reaction system is stable and controllable, and the prepared methyl methacrylate-styrene copolymer is high in purity and has good light transmittance.

The invention discloses a method for preparing a starch grafted hyperbranched amide polymer. The method is characterized by: preparing a mixed phase and a branching reagent phase, gelatinizing the mixed phase for 0.1-1 hour at a temperature of 25-95 DEG C, then adjusting the temperature to 40-80 DEG C, adding a RAFT chain transfer agent to the gelatinized mixed phase, then adding a initiator to initiate a polymerization; during the polymerization, adding the branching reagent phase to the mixed phase in a dropwise manner within 1-10 hours, and sequentially carrying out the reaction for 0.5-4 hours after completing the adding, finally, carrying out a high-conversion preparation to prepare the starch grafted hyperbranched amide polymer. With the present invention, diene monomers and the chain transfer agent with low ratio are provided for high-polymerization rate and high- conversion preparation of the starch grafted hyperbranched amide polymer in a polar solvent system by using a semi-continuous polymerization process through a reversible addition and fragmentation chain transfer polymerization; the polymerization is easy to be controlled and turbidity removal effect of the productis significant.

The invention discloses a method for preparing a cation type hyperbranched ethylene or acrylamide polymer. The method comprises the following steps of: carrying out reversible addition-fragmentation transfer (RAFT) polymerization; and highly conversing in a polar solvent system by adopting a diene monomer and a chain transferring agent of the RAFT polymerization with low proportion through a semicontinuous operation process to prepare the cation type hyperbranched ethylene or acrylamide polymer. The polymerization process of the method is easily controlled, and molecular weights of a final product and distribution thereof can be controlled.

The invention provides a weatherproof heat-resistant flame-retardant resin composition and a preparation method thereof. The resin composition comprises 10-65 parts of halogen substituent maleimide heat-resistant flame-retardant resin, 30-55 parts of a graft polymer of acrylic ester elastomer graft aryl ethylene monomers and nitrile vinyl monomers and 5-35 parts of a binary copolymer of aryl ethylene monomers and the nitrile vinyl monomers. The prepared weatherproof heat-resistant flame-retardant resin composition has the advantages of nice appearance, good weatherability, high heat resistance and flame retardation, and the resin composition is a heat-resistant flame-retardant material with excellent properties. The prepared weatherproof heat-resistant flame-retardant resin can be widely used for modifying heat resistance and flame retardance of such materials as ABS, PC, PBT and the like. As a material with excellent heat-resistant and flame-retardant properties, the resin composition can be used alone for preparing high heat-resistant and flame-retardant parts of automobiles and household electrical appliances.

This invention discloses a method for synthesizing heat-resistant maleimide resin emulsion. The method comprises four steps: (1) adding emulsifier, part of aryl ethylene monomer, nitrile ethylene monomer and initiator into a reactor equipped with stirrer, and emulsifying to obtain primary emulsion A; (2) adding maleimide monomer, the rest aryl ethylene monomer and nitrile ethylene monomer into a mixing tank, and mixing to obtain homogeneous monomer solution B; (3) adding desalting water, initiator, emulsifier and B into an emulsification tank, and emulsifying to obtain monomer emulsion C; (4) adding C into the reactor, and polymerizing with A.. The obtained heat-resistant maleimide resin emulsion has good appearance, uniform composition and structure, good heat resistance, and high yield. The obtained heat-resistant maleimide resin emulsion can be used for modifying such materials as ABS, PC and PBT, and can also be used lonely for producing heat-resistant components of automobiles and home appliances.

The invention relates to a stationary phase of liquid chromatography. A zwitterionic polymer stationary phase is characterized by being constructed through a manner of anion-cation copolymerization. The zwitterionic polymer stationary phase has a structural formula which is described in the description. In the structural formula, Silica is silica gel; n or m is equal to an integer of 1 to 100; R1is one selected from the group consisting of H or CH3; -R2 is a side chain with a cation radical; and -R3 is a side chain with an anion radical. The zwitterionic polymer stationary phase is prepared by using a controllable anion-cation free radical copolymerization reaction. The method has the following advantages: the rate of the polymerization reaction is controlled through an RAFT reagent in the process of polymerization; reaction conditions are mild; and a polymer stationary phase prepared by using the method provided by the invention has controllable molecular weight, narrow distributionrange and uniform bonding density. The zwitterionic polymer stationary phase provided by the invention can be used as a separation material, and is widely applied to the fields of hydrophilic interaction chromatography, glycopeptide enrichment, heavy metal adsorption, etc.

The invention discloses a preparation method of a super absorbent resin. The preparation method of the super absorbent resin comprises (1) preparing acrylic acid, functional monomers, initiator, crosslinking agent and water-absorbent auxiliaries; (2) dispersing, by weight part, 35-85 parts of the acrylic acid into 20-40 parts of deionized water to obtain an acrylic acid solution; (3) dropwise adding alkaline solution into the acrylic acid solution to obtain a neutralized acrylic acid solution with a degree of neutralization of 30-85%; (4) sequentially dispersing the functional monomers, the initiator, the crosslinking agent and the water absorbent auxiliaries into the neutralized acrylic acid solution, and stirring the mixture for 5-20 minutes; (5) transferring the solution obtained in thestep (4) in an air-insolated mode to a container for standing for 3-5 hours to obtain a jelly, during which the temperature for standing is 50-90 DEG C; (6) drying and cracking the jelly obtained inthe step (5), screening out 20-140-mesh powder to obtain the super absorbent resin.

The invention relates to a maleimide heat-resistant resin composition and a preparation method thereof. The resin composition comprises 10-65 parts of maleimide heat-resistant resin, 30-55 parts of a graft polymer of a conjugated diene rubber graft aryl ethylene unit and a nitrile vinyl unit and 5-35 parts of a binary copolymer of aryl ethylene monomers and nitrile vinyl monomers. The maleimide heat-resistant resin composition prepared by the method has the advantages of nice appearance and high heat resistance, and the resin composition is a heat-resistant material with excellent properties. The prepared heat-resistant resin can be widely used in heat resistance and modification of such materials as ABS, PC, PBT and the like. As a material with excellent heat-resistant property, the resin composition can be used alone for preparing high heat-resistant parts of automobiles and household electrical appliances.

The invention relates to a method for preparing high molecular weight modified polymethyl methacrylate. The method includes the steps that firstly, the raw materials of 80-100 parts of monomer methyl methacrylate, 5-30 parts of copolymerization modified monomer, 10*10-4-150*10-4 parts of initiator and 0.1-0.5 part of chain transfer agent are taken and fully stirred so that the raw materials can be mixed evenly; the mixture is put into a reactor provided with a backflow condensing device, oil bath heating and temperature rising are conducted, the reaction temperature is controlled to range from 80 DEG C to 150 DEG C, a stirring reaction is conducted for 6-10 h under the rotating speed of 300-500 r/min, a viscous copolymerization product is formed, and finally the modified polymethyl methacrylate is prepared after aftertreatment. According to the method, polymerization is conducted in a one-time feeding mode, operation is simple, the polymerization reaction is easy to control, the polymerization rate is high, and the prepared polymer has high molecular weight.

The invention relates to a heat-resistant resin composition and a preparation method thereof. The resin composition comprises the following: 10 to 65 portions of maleimide heat-resistant resin, 30 to 55 portions of graft polymer of conjugated diene rubber grafted aryl ethylene unit body and nitrile vinyl unit, and 5 to 35 portions of biopolymer of aryl ethylene monomer and nitrile vinyl monomer. The heat-resistant resin composition prepared by the method for preparing the maleimide heat-resistant resin composition has the advantages of good appearance and high heat resistance, and is a heat-resistant material with good performance. The prepared heat-resistant resin can be widely used for heat-resistant modification of materials, such as ABS, PC, PBT and the like. As a material with excellent heat-resistant performancs, the resin composition can be independently used, and can also be used for preparing high heat-resistant parts of automobiles and home appliances.

The invention relates to a method for preparing a polyether polycarboxylic acid type high-efficiency water reducing agent from polyethylbenzene tower bottom high-boiling residues. The polyether polycarboxylic acid type high-efficiency water reducing agent is prepared by free radical polymerization of arone olefin, a double-bond-containing macromonomer and a micromolecular monomer, and the arone olefin is prepared by catalytic acylation of poly-ethylbenzene sulfonic acid and unsaturated acylate by using a bifunctional molecular sieve encapsulated catalyst. The bifunctional molecular sieve encapsulated catalyst is prepared by one-step hydrothermal reaction of sodium metaaluminate, sodium hydroxide, modified silicon dioxide, N,N,N-trimethyl-1-amantadine, carbon nanotubes and (2,2'-bipyridine) nickel diiodide. The polyethylbenzene sulfonic acid is prepared by sulfonating the high-boiling residues at the bottom of a polyethylbenzene tower. According to the method, the polyethylbenzene tower bottom high-boiling residues serve as raw materials, polyether polycarboxylic acid type high-efficiency water reducing agent molecules are prepared through the steps of sulfonation, acylation, free radical polymerization and the like, and the polyether polycarboxylic acid type high-efficiency water reducing agent is practically applied to the building field and has important significance in resourceful treatment of the ethylbenzene tower bottom high-boiling residues.

The present invention is a preparation method for a halogen substitute maleimide Imide-like anti-heat resin emulsion: a reactor is added with emulsifier, some aryl vinyl monomer, cyano-ethylene monomer, and oil-soluble thermal decomposition initiator and other agents for emulsification so as to generate primary emulsion (a); the remained maleimide monomer, aryl vinyl monomer, cyano-ethylene monomer, and oil-soluble thermal decomposition initiator and other agents are added into a mixing trough so as to generate homogeneous monomer mixed liquid(b); the emulsifier and (b) are added into the emulsifier and are stirred for emulsion so as to generate monomer emulsion (c); the monomer emulsion (c) is added into the reactor to mix with (a) for polymerization reaction which generates heat-resistant polymer resin emulsion (d). The anti-heat resin emulsion obtained by the present invention has the advantages of good appearance, even composition and structure, high heat-resistant effectiveness, high fire-retardant and polymerization efficiency and so on. The anti-heat flame-retardant resin emulsion can be widely used in the improvement of anti-heat and flame-retardant effectiveness of ABS, PC, PBT and other materials. When used alone, the anti-heat flame-retardant resin emulsion can also be used in the anti-heat and flame-retardant components of automobiles and domestic appliances.

This invention discloses a method for synthesizing heat-resistant maleimide resin emulsion. The method comprises: (1) adding the emulsifier, part of arylethylene monomer, part of nitrilethylene monomer and the initiator into a reactor equipped with a stirrer, and emulsifying to obtain a primary emulsion; (2) adding maleimide monomer, the rest nitrilethylene monomer and the rest arylethylene monomer into a mixing tank to form a homogeneous mixed solution of the monomers; (3) adding desalted water, the initiator, the emulsifier and the mixed solution into an emulsator, and emulsifying to obtain a monomer emulsion; (4) adding the emulsion to the reactor, and polymerizing with the primary emulsion to obtain the heat-resistant resin emulsion. The heat-resistant resin emulsion has such advantages as good appearance, uniform composition and structure, good heat resistance and high yield. The heat-resistant resin emulsion can be used for heat-resistant modification of ABS, PC and PBT, and for manufacturing high heat-resistant elements of vehicles and electric appliances.

The invention relates to the technical field of logo manufacturing of tempered glass, in particular to a technology for printing a color-variable logo through 3D magnetic printing ink. The technologyincludes the following steps that firstly, the tempered glass is taken out, and cleaning and inspecting are conducted on the tempered glass; secondly, the 3D magnetic printing ink is adopted for screen printing of the logo on the tempered glass; and thirdly, the tempered glass on which the 3D magnetic printing ink is printed in a screen printing manner is baked and inspected. By means of the technology for printing the color-variable logo through 3D magnetic printing ink, the 3D magnetic printing ink is used for printing the color-variable logo to the product, the variable-color logo can havea strong 3D visual effect, different color changes can be seen from different angles, the logo can be printed on a tempered glass production film and has good adhesive force, corrosion resistance andwear resistance, the hardness is high, disengagement is not likely to happen, and the service life is long. By means of the technology, operation control is convenient, the production efficiency is high, the production cost is low, the product quality is stable, and industrial mass production is facilitated.

The invention provides a maleimide heat-resistant resin composition with improved lustrousness. The heat-resistant resin composition comprises the following raw materials based on 100 mass portions: 10 to 65 portions of maleimide heat-resistant resin, 30 to 55 portions of graft polymer of conjugated diolefine rubber graft aryl vinyl monomer, nitrile grouping vinyl monomer or/and copolymerizable acrylic ester monomer of which copolymerizable acrylic ester monomer accounts for 0 to 10 mass percent, and 5 to 35 portions of biopolymer of aryl ethylene monomer and nitrile vinyl monomer. The heat-resistant composition prepared by a preparation method of the maleimide heat-resistant composition has the advantages of excellent comprehensive performance, attractive appearance, high heat resistance and good lustrousness. The prepared heat-resistant resin can be widely applied in the aspect of heat resistance and modification of ABS, PC, PBT and other materials, can be used as a material with excellent heat-resistant performance, can be independently used, and can be used for preparing high heat-resistant parts of automobiles and household electrical appliances.

The invention belongs to the field of petroleum and natural gas well cementation projects and particularly relates to an oil well cement sedimentation stabilizer suitable for oil and gas well cementation, a preparation method thereof and a cementing slurry. The oil well cement sedimentation stabilizer contains structural unit A shown as formula (I), structural unit B shown as formula (II) and structural unit C shown as formula (III). The molar ratio of the structural units A, B and C is x:y:z=1:(0.07-0.22):(0.03-0.11); in the formulas, R1, R2 and R3 are H, or C1-C4 is substituted or non-substituted alkyl group, and m is 15, 17, 19 or 21. The oil well cement sedimentation stabilizer allows zero thickening at low temperature and thickening at high temperature; the problem that the cementingslurry settles and loses stability is effectively solved.

A catalyst for preparing branched polyethylene from ethylene is composed of main catalyst prepared by carrying Ti compoud-Ni compound on the MgCl2 ZnCl2, or SiO2 and the co-catalyst which is composite alkylaluminium (AlEt2Cl-AlR3). It is prepared by dipping reaction.

The invention belongs to the technical field of organic synthesis, and particularly relates to a preparation method of bio-based polyester. Terephthalic acid and derivatives thereof are synthesized into high-molecular-weight polyester compounds by adopting a two-step method. By adopting the method disclosed by the invention, efficient, mild and controllable polymerization reaction is realized, introduction of any metal in a catalytic polymerization reaction process is completely avoided, a depolymerization reaction of the catalyst in a secondary (or subsequent) process is avoided, polymer molecules with a predetermined structure are constructed, and design and control of the performance of a polymer material are realized.

The present invention relates to the synthesis method of a halogen substitute maleimide Imide-like anti-heat flame-retardant resin emulsion. The synthesis process can be divided into four steps. The components and the operating condition of the present invention are: emulsifier, some aryl ethylene monomer, cyano-ethylene monomer, initiator and other agents are added into a reactor for emulsification so as to generate the primary emulsion (a); the halogen substitute maleimide monomer, the remained aryl ethylene monomer and cyano-ethylene monomer are added into a mixing trough to form homogeneous monomer mixture (b); desalination of water, initiator, emulsifier, and (b) are added into a emulsifier for emulsification so as to generate monomer emulsion (c); when (a) is formed,(c) is added into the reactor to mix with (a) for polymerization reaction. The anti-heat flame-retardant resin emulsion obtained by the present invention has the advantages of good appearance, even composition and structure, high heat-resistant effectiveness, high fire-retardant and polymerization efficiency and so on. The anti-heat flame-retardant resin emulsion can be widely used in the improvement of anti-heat and flame-retardant effectiveness of ABS, PC, PBT and other materials. When used alone, the anti-heat flame-retardant resin emulsion can also be used in the anti-heat and flame-retardant components of automobiles and domestic appliances.

The invention belongs to the technical field of catalysts, and particularly relates to a carbon-based double-confinement interface loaded monatomic catalyst and a preparation method thereof. The preparation method comprises the following steps: synthesizing a PDA-GO-PDA composite material in which graphene oxide (GO) is coated with polydopamine (PDA); synthesizing an NC-RGO-CN double-confinement interface composite material in which reduced graphene oxide (RGO) is coated with nitrogen-doped carbon (NC); and synthesizing the M1/NC-RGO-CN double-confinement interface monatomic catalyst of the NC-RGO-CN double-confinement interface composite material loaded with the metal monatomic (M1). By improving the whole process flow and the reaction conditions and parameters of each key process step, the dispersity, the catalyst activity and the cycling stability of metal single atoms can be effectively improved.

The present invention is a preparation method for a halogen substitute maleimide Imide-like anti-heat flame-retardant resin emulsion. The halogen substitute maleimide Imide monomer, aryl vinyl monomer, cyano-ethylene monomer and other initiators are added into a mixing trough, and are mixed and stirred to generate homogeneous monomer mixture (a); emulsifier and other agent are added into a emulsifier, wherein (a) is also added for emulsification so as to generate monomer emulsion (b); desalination water and (b) are added to a reactor for added to the reactor polymerization reaction at the temperature of 60 DEG C to 90 DEG C; then anti-heat flame-retardant resin emulsion (c) is obtained. The anti-heat flame-retardant resin emulsion obtained by the present invention has the advantages of good appearance, even composition and structure, high heat-resistant effectiveness, high fire-retardant and polymerization efficiency and so on. The anti-heat flame-retardant resin emulsion can be widely used in the improvement of anti-heat and flame-retardant effectiveness of ABS, PC, PBT and other materials. When used alone, the anti-heat flame-retardant resin emulsion can also be used in the anti-heat and flame-retardant components of automobiles and domestic appliances.