739 results about "Initiation" patented technology

The invention discloses a preparation method of a biodegradable carbon dioxide-based polyester-polycarbonate terpolymer. A commercialized, simple and efficient nonmetal triethyl boron/tetra-n-butyl ammonium chloride catalytic initiation system is used for catalyzing and initiating epoxypropane, carbon dioxide and phthalic anhydride to be subjected to a ternary polymerization reaction, and an aromatic polyester structure with the content of 10%-40% is successfully introduced into a main chain of polymethyl ethylene carbonate (PPC). The terpolymer can have different sequence structures; and haverandom and block structures and the like, the glass transition temperature and the thermal stability of PPC are improved, and a catalytic system does not contain metal components, so that the phthalic anhydride modified PPC has extremely high light transmittance, very high melt viscosity and good foaming performance on the premise of keeping the biodegradability of a PPC material. The method canbe used for synthesizing the modified PPC biodegradable material, and widens the application range of the PPC material.

The invention discloses a normal temperature self-crosslinked fluoro-containing polyacrylic acid microemulsion and its preparing process, wherein the microemulsion comprises the constituents of (methyl) acrylic ester, alkenyl carboxylic acid, alkenyl linking agent, ethenyl aromatic compound, alkenyl fluoro-containing alkyl ester, other olefins unsaturated monomer, initiating agent, buffering agent, emulsifying agent, neutralization agent and water. The preparation process comprises making seed emulsion under oxidation and reduction initiation system, then employing semi-continuous polymerization process to prepare the fluoro-containing polyacrylic acid microemulsion with good polymerization stability, small particle size, low film coating surface tension, and strong adhesion.

The invention discloses molecular imprinting polymer which belongs to the technical field of pesticide molecular imprinting and preparation method thereof. The molecular imprinting polymer is prepared by the following steps of: mixing a polymerization reaction monomer, a cross-linking agent, a hole inducing agent, an initiating agent and an imprinting molecule diethyl(3-methyluren)(phenyl)methyl phosphonate, carrying out in-situ polymerization reaction under the condition of thermal initiation and/or photo-initiation to obtain a polymer containing diethyl(3-methyluren)(phenyl)methyl phosphonate; washing the polymer till an imprinting molecule is not detected; and then washing by an organic solvent to neutrality and drying in vacuum to obtain the molecular imprinting polymer. The invention also discloses applications of the molecular imprinting polymer in aspects of separating, purifying and detecting organophosphorus pesticide in a sample. The applications of the polymer prevent the influence of target analyte template leakage on a following adsorption experiment, can simultaneously detect various target molecules and widen the detecting range of the target molecules.

There are provided a dip-molded product that has good resistance to organic solvents, good feeling, sufficient tensile strength, and high contact-state-sustaining performance, a dip-molding composition for forming the dip-molded product, and a dip-molding copolymer latex that can suitably be used for the dip-molding composition. The copolymer latex is a carboxylated acrylonitrile-butadiene copolymer latex that is produced by copolymerization of a monomer mixture of a specific composition comprising 1,3-butadiene, acrylonitrile and methacrylic acid, in which a part of the total amount of the acrylonitrile and a part of the total amount of the methacrylic acid are added to the polymerization reaction system at a specific time after the initiation of the polymerization, and the content of methyl ethyl ketone-insoluble components in the resulting polymer is in a specific range. The dip-molding composition comprises the latex, a vulcanizing agent and a vulcanization accelerator.

The invention discloses a preparation method for a high-slump-retention polycarboxylate water reducer. The preparation method comprises the following steps of: esterifying methoxylpolyethylene glycol monomethyl ethers with different molecular weights with methacrylic acid and a mixed polymerization inhibitor for a period of time under the action of a catalyst and at a certain temperature, then adding allyl alcohol in one time, further esterifying in the same conditions to obtain an esterified macromonomer MP containing crosslinking monomer allyl methacrylate; then performing aqueous solution polymerization on the MP, unsaturated sulfonate, (meth)acrylate unsaturated monomers and a chain transfer agent in a low-temperature condition and within a redox initiation system; and finally adding caustic soda liquid to neutralize, so as to obtain the polycarboxylate water reducer with a certain concentration. The high-slump-retention polycarboxylate water reducer prepared by the preparation method disclosed by the invention is a high-performance water reducer which is prepared at a low temperature by virtue of a molecular structure design, as well as is high in slump retention, excellent in dispersing performance, good in adaptability, simple in process, pollution-free, low in energy consumption, and easy to realize industrialized production.

The invention discloses a cation type hydrophobic association polymer and a preparation method and application thereof. Through adopting acrylamide, dimethyl diallyl ammonium chloride and butyl acrylate as synthesis monomer, the cation type hydrophobic association polymer is made through a common free radical micelle polymerization method and making use of a composite initiation system and additive auxiliary agent urea. Moreover, the cation type hydrophobic association polymer, which has the characteristics of high molecular weight, excellent product stability, strong adsorption bridging capacity of colloid matter, good flocculation effect, wide application scope, less generated sludge and hydrophobic association function, etc., can be widely used in the treatment of oil field oily wastewater.

To obtain a polymerization initiator (acid generating agent) having excellent power for initiation of cationic polymerization without containing arsenic or antimony. [Means for solution] Provided is a specific onium salt or transition metal complex salt of a fluorinated alkyl fluorophosphoric acid.

A mortar composition, curable by frontal polymerization after heat initiation, is described, wherein are contained a) at least one polymerizable monomer and/or at least one curable resin, b) at least one polymerization initiator, which can be activated and/or released thermally at a temperature above 30° C., for the polymerizable monomers and/or curing accelerator for the curable resin and c) optionally at least one filler, the nature and amount of polymerizable monomer or curable resin and polymerization initiator or curing accelerator being selected so that a polymerization front velocity of at least 10 cm/min results after the polymerization is initiated, as well as a method for fastening tie bars, reinforcing steel or the like in solid substrates.

The invention relates to a preparation method of high-strength nano-composite hydrogel capable of rapidly responding to pH and temperature. The preparation method taking dimethylaminoethyl methacrylate as a monomer, inorganic nanometer clay and N,N'-methylenebisacrylamide as co-crosslinking agents, and a nanometer cellulose whisker as a gel composite reinforcer comprises the following steps of: stirring the components, carrying out uniform ultrasonic oscillation, carrying out photo-initiation free radical polymerization in 0 DEG C ice-bath, then reacting at -18 DEG C for 24 hours to obtain the final gel product. The hydrogel prepared by the method has the dual responses of temperature and pH and excellent mechanical performance and can rapidly swell and deswell; and the lowest transformation temperature of the hydrogel is close to temperature of human bodies; raw materials are cheap; the preparation method is simple; and the high-strength nano-composite hydrogel has the potential of application in fields such as sustained release of medicines and tissue engineering.

Provided are: surface modification method for imparting slidability to surface of elastic body such as vulcanized rubber or thermoplastic elastomer without using expensive self-lubricating resin; surface-modified elastic body with polymer brush formed on its surface; and gasket for injector and injector formed of surface-modified elastic body. The surface modification method applies to surface of thermoplastic elastomer or vulcanized rubber. The surface modification method comprises the step of forming hydroxyl group on surface of to-be-modified object such as rubber so that water contact angle of the surface becomes 8 to 50 degrees smaller than original water contact angle in unmodified condition, the step of forming polymerization initiation site by subjecting the hydroxyl group to action of secondary or tertiary organic halide, and the step of growing polymer brush on the surface of to-be-modified object by subjecting monomer to radical polymerization at the polymerization initiation site acting as a point of initiation.

In order to overcome the phenomenon that the existing polycarboxylic acid water reducing agent is hypersensitive to slime contained in aggregate, the invention provides an assistant which can effectively inhibit the influence of the slime on the polycarboxylic acid water reducing agent and a preparation method thereof. The assistant for the polycarboxylic acid water reducing agent is a product obtained by the polymerization of an acrylamide monomer and an amine-alkene-containing monomer under the initiation effect of an initiator, wherein the amine-alkene-containing monomer specifically refers to one of dimethylallyl amine, diallyl amine, dimethylaminoethyl methacrylate or dimethylaminoethyl acrylate. The assistant provided by the invention can well inhibit the influence of the slime contained in aggregate on the polycarboxylic acid water reducing agent and keep a favorable working state. Besides, the preparation method provided by the invention has simple reaction conditions and is applicable to industrial production; and the obtained product contains no chloride ion.

The present invention provides a method for preparing isobutene block copolymer by adopting sequence initiation. Said method successively includes the following steps: (1) first-stage polymerization: making styrene monomer (monomer A) implement 'controllable' or 'active' cationic homopolymerization or copolymerization; and (2) second-stage polymerization: using isobutene as monomer, using polymerization product of first-stage as macromolecular initiator, adding a novel Lewis acid as coinitiator and making homopolymerization of isobutene; or using isobutene as monomer, using polymerization product of first stage as macromolecular initiator, adding a novel Lewis acid as coinitiator and making copolymerization of copolymerization monomer of isobutene so as to obtain the invented block copolymer.

The invention discloses a method for preparing a quick-response temperature-sensitive hydrogel by adopting room-temperature eutectic solvent liquid frontal polymerization, and belongs to the technicalfield of preparation of functional polymer materials. The method comprises the following steps: mixing a polymerizable temperature-sensitive monomer, a hydrogen bond donor compound and a hydrogen bond acceptor compound, stirring at 80-100 DEG C until a transparent and clear liquid is formed, and cooling to room temperature to obtain a room-temperature eutectic solvent liquid; adding a cross-linking agent and an initiator into the room-temperature eutectic solvent liquid to form a mixture solution; transferring the formed mixture solution into a tubular reactor, initiating a reaction at the upper end or the lower end of the reactor by adopting a heat source or ultraviolet light, and removing the heat source or the ultraviolet light after the thermal initiation reaction is started until allthe raw materials in the whole reactor are converted into a polymer gel; and soaking and washing the obtained polymer gel with distilled water, and freeze-drying to obtain the target hydrogel. No extra liquid solvent is needed, the polymerization speed is high, the reaction time is short, and the energy consumption is low.

The invention provides a method for preparing a carbon nano-tube modified in-situ polymerization based on plasma initiation. The method takes a carbon nano-tube and acrylic acid, styrene or acrylamide monomers as raw materials for functional polymerization reaction preparation, and functional groups grafted to the surface of the carbon nano-tube accounts for 12 to 72 percent of the total amount. The obtained carbon nano-tube subjected to in-situ polymerization has good solubility and compatibility, can conveniently react with other compounds, and can be conveniently combined with other high polymers to prepare nano composite materials so as to have wide application prospect. The method is simple and practical, has high efficiency and mild reaction conditions, and does not need complex testing apparatuses.

The invention relates to a preparation method of heat-resistance and salt-tolerance anionic polyacrylamide for oil displacement and mainly solves the problems of low molecular weight and poor heat resistance as well as salt tolerance of polymers in the prior art. With the combination of a complex initiation system composition and a post-hydrolysis technology, the method provided by the invention comprises the following steps of: carrying out aqueous solution polymerization on acrylamide, crushing gel slug, mixing with a certain concentration of alkali lye for hydrolysis reaction, drying and crushing to obtain fine granular anionic polyacrylamide. The technical scheme greatly solves the problems and can be used in the industrial production of heat-resistance and salt-tolerance anionic polyacrylamide for oil displacement.

The invention discloses a reversible self-repair antibacterial acrylic coating and preparation and self-repair methods. The preparation method comprises the steps of adding methyl methacrylate, butyl acrylate, sulfonyl betaine methacrylate and acetoacetoxy methacrylate gylcol ester into an alcohol solvent, and performing free radical polymerization under the initiation of azodiisobutyronitrile to obtain linear acrylic resin; and dissolving the linear acrylic resin and amino-containing hyperbranched polysiloxane into the alcohol solvent, coating the surface of a base material, and drying, thus obtaining the reversible self-repair antibacterial acrylic coating. Efficient and mild repair of the coating is realized by using the characteristic of reversible reaction of vinylogous urethane bonds at room temperature and amino rich at the terminal of the hyperbranched polysiloxane, and the acrylic coating is endowed with excellent antibacterial property by the safe, nontoxic and non-specific sulfonyl betaine. The product has good applicability and strong practicability; the preparation method has the characteristics of wide raw material source, simple process and environment friendliness.

The invention discloses an inverse emulsion drag reduction agent for fracturing a shale gas by using quick water and a preparation method thereof, and relates to the technical field of petroleum engineering. The inverse emulsion drag reduction agent is a macromolecular water soluble polymer which is prepared from acrylamide, sodium acrylate and dodecyl methacrylate copolymerized in an inverse emulsion, and azo diisobutyl hydrochloride and sodium hydrogen sulfite as complex initiation systems. A long-chain hydrophobic monomer is introduced into the drag reduction agent, so that the shear resistance of the drag reduction agent in a high displacement pump injection process is improved, meanwhile, the drag reduction agent is prepared from the inverse emulsion in a polymerization manner, the product is a liquor and instant, the liquor demands of a continuous mixed construction technology for fracturing the shale gas are met, the dosage for field use is 0.06-0.8% of mass of clean water, and the drag reduction rate can be up to 73%.

The invention discloses a preparation method of a pH-responsive graphene /polymer nanometer hybrid material. The preparation method comprises the following steps: under the protection of inert gas of argon or nitrogen, carrying out an esterification reaction by using a reversible addition-breakage chain transfer polymerization chain transfer agent of hydroxyl and terminal carboxyl on the surface of graphene oxide to obtain a macromolecular chain transfer agent for reversible addition-breakage chain transfer polymerization; and then, carrying out reversible addition-breakage chain transfer polymerization under initiation of azodiisobutyronitrile to obtain the pH-responsive grapheme/polymethylacrylic acid-N,N-lignocaine ethyl ester nanometer hybrid material. The graphene oxide/polymer nanometer hybrid material not only ensures that the dispersibility of graphene in water is greatly improved but also has pH responsiveness, and can be widely applied to the fields of drug controlled release carriers, biosensors, intelligent nanometer materials and the like. The preparation method is simple and easy, and industrial production of materials can be realized, so that the method has good popularization and application values.

The invention discloses a preparation method of a hollow porous microsphere adsorbent and belongs to the technical field of environment-friendly functional material preparation. ZIF-8 nanoparticles are used as stable particles of a Pickering emulsion and are dispersed into a solution so as to be used as a water phase. Dodecane is used as an oil-phase solvent, and crosslinking agents azodiisobutyronitrile, styrene and vinyl benzene are mixed to be used as an oil phase. The water phase and the oil phase are mixed to form a stable Pickering emulsion. The hollow porous microsphere adsorbent is prepared by carrying out a thermal initiation reaction and is applied to the adsorption and separation of amoxicillin in a water solution. The product has large specific surface area and good stability and is beneficial to the adsorption of target molecules, porous ZIF-8 attached to the outer parts of the hollow microspheres provides a great number adsorption sites for the material, and the ZIF-8 nanoparticles stably attached to the hollow microspheres are more conveniently recycled as comparison with ZIF-8 particles in discrete distribution.

The invention relates to a photo-initiation type polycarboxylic acid water reducing agent and a preparation method thereof. The preparation method comprises the following steps: dissolving the following components into water in parts by weight: 72 to 90 parts of a big polyether monomer, 10 to 27 parts of an unsaturated poly-monomer, 0.2 to 0.9 part of a molecular weight modifier and 0.3 to 1.0 part of a photoinitiator, so as to obtain a mixed monomer solution; continuously performing ultraviolet irradiation on the mixture in a photo-initiation reactor, then performing aging reaction in a reaction kettle for 0.2 to 2 h, and neutralizing to reach the PH of 6.5 to 7.5 so as to obtain a finished product. The preparation method can be carried out under room temperature, and even low temperature, so that the energy consumption is low; the reaction is fast, and the production efficiency is high; the whole reaction process is short in time. The process method is simple and is easy to operate, and the production efficiency of the polycarboxylic acid water reducing agent can be greatly improved, so that the product has higher market competitiveness.

The invention discloses an organic-inorganic composite up-conversion photoluminescence film and a preparation method thereof, and belongs to the technical field of optical functional composite film. According to the preparation method, ultraviolet light polymerization is adopted, urethane acrylate (UA) modified with methyl methacrylate (MMA) is taken as an organic polymer monomer, polymerization is realized under initiation of a photoinitiator, and at the same time inorganic up-conversion photoluminescence crystalline particles are dispersed in an obtained polymer uniformly so as to obtain the organic-inorganic composite up-conversion photoluminescence film. The organic-inorganic composite up-conversion photoluminescence film possesses flexibility, self-sustaining performance, up-conversion photoluminescence performance, certain transparency, and a promising application prospect. The preparation method is simple; heat treatment is not needed; film preparation efficiency is high; preparation conditions are easy to control; and the preparation method is suitable for large-scale production.