44992-01-0Relevant academic research and scientific papers
METHOD FOR PREPARING A BIOCIDAL, BACTERIOCIDAL AND/OR BACTERIOSTATIC MATERIAL
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, (2022/03/02)
A process for preparing a biocidal, bactericidal and/or bacteriostatic material including the preparation of a polymer precursor solution that has (a) at least one monomer A having a porphyrin group and at least one radical polymerizable function, (b) at least one radical polymerizable monomer B, a photoinitiator, and (c) at least one of the monomers chosen from a monomer C having a quaternary amine and a radical polymerizable function; and/or a monomer D having copper and a radical polymerizable function. Also, the material obtainable by the process and its uses.
Organic monomer for synthesizing amphoteric polycarboxylic superplasticizer and preparation method
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Paragraph 0027; 0028; 0029; 0030; 0031; 0032; 0033, (2016/11/21)
The invention discloses an organic monomer for synthesizing an amphoteric polycarboxylic superplasticizer, which has a molecular structure shown in the description. The invention further discloses a preparation method of the organic monomer for synthesizing the amphoteric polycarboxylic superplasticizer and comprises the following steps: preparing a dimethylaminoethyl acrylate intermediate and a cationic active organic monomer; adopting one-time charging at the normal temperature; and selecting a reasonable type of catalyst to prepare the organic monomer. The method has reduced cost, plays an important part in process simplification, and has characteristics of high reaction conversion rate, high yield, and high purity. Compared with an anionic polycarboxylic superplasticizer sold in the market, under a condition of a relatively low mixing amount, the amphoteric polycarboxylic superplasticizer enables neat cement paste or concrete to have excellent performance of good water reduction, high dispersion, good plasticity preservation, and high early-stage compressive strength.
PROCESS FOR UNSATURATED QUATERNARY AMMONIUM SALT
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Page/Page column 5, (2011/02/18)
An unsaturated quaternary ammonium salt is produced by a process that includes reacting methyl chloride in a first vessel with a stoichiometric excess of an unsaturated tertiary amine in the presence of water to form a reaction mixture that includes the unsaturated quaternary ammonium salt and residual unsaturated tertiary amine. The reaction mixture is transferred to a second vessel and phase separated to yield a first fraction in which the unsaturated quaternary ammonium salt is concentrated, and a second fraction in which the residual unsaturated tertiary amine is concentrated. At least a portion of the second fraction is recycled from the second vessel to the first vessel for use in the reaction with methyl chloride. The process, which is preferably operated continuously, allows the use of reduced reaction pressures compared to processes utilizing a stoichiometric excess of methyl chloride, and it also reduces or eliminates the problems associated with recycling methyl chloride and removing methyl chloride from the unsaturated quaternary ammonium salt product.
CONTINUOUS PRODUCTION OF DMAEA QUATERNARY SALTS
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Page/Page column 3-4, (2011/08/04)
The invention provides a method of continuously producing high quality quaternized N,N-dialkylaminoethyl (meth)acrylates (DMAEA.MCQ) that has a long shelf life and which is stable in water. The method involves placing starting materials into a continuously stirred tank reactor in the presence of less than 6% water. This low amount of water causes two liquid phases to form and prevents unwanted side reactions. The denser liquid phase contains DMAEA.MCQ and the lighter phase contains the starting materials. Liquid from the denser phase is removed from a position where little of the lighter phase has been mixed in. The removed liquid then has any last traces of the starting materials reacted into DMAEA.MCQ and strips away any starting materials with a gas flow. The resulting liquid is high purity DMAEA.MCQ. Water can then safely be added to ease in the transport and use of the produced DMAEA.MCQ.
Method for making aqueous solutions of unsaturated quaternary ammonium salts
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Page/Page column 4-5, (2008/06/13)
The invention concerns a method for making aqueous solutions of unsaturated quaternary ammonium salts of formula (I) by reacting, in the presence of water, N,N-dimethylaminoethyl acrylate with a quaternizing agent of formula (II): R—Cl, said method is characterized in that it consists in: (a) in a closed reactor containing 5 60 wt. % of N,N-dimethylaminoethyl acrylate required for the reaction and which has been pressurized with air or depleted air at 0.5 to 3 bars, carrying out the reaction by continuously introducing, at a temperature ranging between 35 to 65° C., the quaternizing agent (II), and water, and finally the remaining N,N-dimethylaminoethyl acrylate, until the desired concentration of salt (I) in the water is reached, the water being introduced only when 0–20 wt. % of the amount required for the quaternizing agent (II) reaction has been added; the introduction of the remaining N,N-dimethylaminoethyl acrylate starting only when 20–80 wt. % required for the quaternizing agent (II) reaction has been added; and the pressure at the end of the reaction capable of reaching 9 bars; then (b) in depressurizing while maintaining the oxygen content constant by simultaneous introduction of air and, after returning to atmospheric pressure, eliminating the residual quaternizing agent. In formule (I) and (II). R=methyl or benzyl.
METHOD FOR PRODUCING UNSATURATED QUATERNARY AMMONIUM SALT
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Page/Page column 10-11, (2008/06/13)
PROBLEM TO BE SOLVED: To provide a method for producing an unsaturated quaternary ammonium salt, capable of producing the salt in a short time, without causing deposition of crystals, nor formation of slurry, in reaction of quarternizing a vinyl monomer having a tertiary amino group with a halogenated alkyl. SOLUTION: This method for producing the unsaturated quaternary ammonium salt expressed by formula (3) comprises sequentially conducting processes (a) to (c) as follows: (a) a process for feeding a reactor with the vinyl monomer having the tertiary amino group and water in an amount of 0-20% based on the total amount of the water to be supplied; (b) a process (reaction former process) for continuously or intermittently supplying the reactor with the water and the halogenated alkyl in a mass ratio X of the water to the halogenated alkyl (provided that, X > 0); and (c) a process (reaction latter process) for continuously or intermittently supplying the reactor with the water and the halogenated alkyl in such a mass ratio X of the water to the halogenated alkyl as to be larger than in the process (b).
METHOD FOR PRODUCING UNSATURATED QUATERNARY AMMONIUM SALT AQUEOUS SOLUTION
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Page/Page column 7-8, (2008/06/13)
PROBLEM TO BE SOLVED: To provide a method for producing an unsaturated quaternary ammonium salt aqueous solution that causes no blockade of a pipe for feeding a halogenated alkyl, when the quaternary ammonium salt is produced. SOLUTION: This invention is a method for producing the unsaturated quaternary ammonium salt aqueous solution by using a (meth)acrylic alkylaminoester, a halogenated alkyl and water, as starting materials, wherein the halogenated alkyl is directly introduced through the halogenated alkyl-introducing pipe into the (meth)acrylic alkylaminoester only or into a mixed solution containing the (meth)acrylic alkylaminoester. In addition, the water is added through the halogenated alkyl-introducing pipe, as the reaction advances.
