50results about How to "Polymerization is easy" patented technology

The invention discloses a preparation method for synthesizing an ultra-slow-release polycarboxylate superplasticizer from high-activity polyether. The preparation method comprises the following steps:S1, uniformly mixing unsaturated carboxylic acid monomers, unsaturated carboxylic acid monobasic ester, unsaturated carboxylic acid dibasic ester, a chain transfer agent and deionized water to obtaina material A, and uniformly mixing a reducing agent and deionized water to obtain a material B; S2, adding deionized water and a high-activity polyether monomer into a reaction kettle, and carrying out stirring and dissolving at normal temperature; S3, adding an assistant into a solution obtained in the step S2 at 10-20 DEG C, carrying out stirring, starting to dropwise add the material A and thematerial B, and carrying out a curing reaction after the dropwise addition is finished; and S4, adding alkali liquor to adjust a pH value to obtain the ultra-slow-release polycarboxylate superplasticizer. The ultra-slow-release polycarboxylate superplasticizer prepared by the invention has a good slump maintaining function, and can continuously release carboxyl groups with a dispersing function in an alkaline cement paste environment, so a concrete mixture can maintain plasticity for a long time, slump maintaining time can reach more than 3 hours, and the demand for long-distance transportation and construction of concrete is met.

A method for producing a polymer, which contains: bringing a monomer containing a vinyl bond into contact with a compressive fluid and melting or dissolving the monomer containing a vinyl bond, followed by carrying out addition polymerization of the monomer containing a vinyl bond in the presence of an initiator.

The invention discloses an aliphatic polyester ionic polymer, which is prepared from aliphatic dibasic acid, aliphatic dihydric alcohol and a quaternary ammonium salt ionic monomer according to a mol ratio of 100:99.7:0.3-100:85:15 under the protection of nitrogen through esterification and polycondensation in sequence. The general structural formula of the aliphatic polyester ionic polymer is defined in the description. The aliphatic polyester ionic polymer has the intrinsic viscosity of 1.5-2.0 dL / g and the complex viscosity which is 1.6-3.1 times of that of pure aliphatic polyester at any appointed temperature in a range of 120-200 DEG C. The intrinsic viscosity and complex viscosity of the aliphatic polyester ionic polymer obtained in the invention are greatly improved, so that relatively high melt-strength, a low shear thinning effect, and excellent blow molding ability are ensured during a machine-shaping process, especially a blow molding process, and excellent foundation is laid in the application of extending the aliphatic polyester ionic polymer to the field of a film.

The invention discloses an amphiphilic polymer pigment wetting dispersant for a water-based coating and a preparation method thereof, and the preparation method comprises the following steps: polymerizing macromer or polyethylene glycol methyl ether methacrylate macromer with polymerizable double bonds with one or two hydrophobic (methyl) polyacrylate monomers in the presence of ARGET ATRP (activators regenerated by electron transfer-atom transfer radical polymerization) to obtain a comb-shaped polymer, and further introducing an anchoring functional group in the comb-shaped polymer for preparing the solid wetting dispersant; or polymerizing the macromer or the polyethylene glycol methyl ether methacrylate macromer with the polymerizable double bonds with the (methyl) polyacrylate monomer with the anchoring functional group in the presence of ARGET ATRP to obtain the comb-shaped polymer which is the solid wetting dispersant. By using the preparation method, the cost can be greatly reduced, the efficiency is improved, and the performances of the product can be greatly improved. The obtained wetting dispersant has good dispersion effect and bright color, and the stability of a dispersion system is high.

The invention relates to a preparation method for unsaturated polyester resin reinforced and toughened by modified natural plant fiber and a bio-based material. According to the invention, a bio-basedtoughening material is employed, modified soybean dreg fiber is adopted as a reinforcement, and thermosetting molding is performed to prepare a composite material. Soybean dregs are widely availableand low in cost, and can better bond with a polyester matrix after surface modification by a coupling agent. A biobased toughening improver is any one or a mixture of more selected from the group consisting of epoxidized soybean oil, epoxy ester and epoxy fatty acid ester. The method provided by the invention improves both the mechanical properties and the biodegradability of the unsaturated polyester composite material, and is simple in process and low in cost.

The invention relates to a method for preparing sugar-containing polyamidoamine-modified nanoclusters, in particular to a method for synthesizing dendritic lactose-containing polyamidoamine-modified gold nanoclusters, and the prepared gold nanoclusters can be used as biosensors. Dendritic cystamine-containing polyamidoamines of different generations were synthesized by Michael addition reaction, and then functionalized with lactobionolactone to obtain glycosyl-functionalized dendritic polyamidoamine D m ‑Lac (m=1,2,3), and finally use the interaction of Au‑S to modify it on the surface of gold nanoclusters to obtain different algebraic dendritic gold nanoclusters modified with lactose-containing polyamidoamine (D m ‑Lac@AuNCs). The synthesis method of the invention is simple, and provides a convenient and effective method for preparing a high-efficiency biosensor with temperature sensitivity and targeting.

This invention relates to a preparation method for poly(butenedioic acid). Polymerization takes places in aqueous phase where there are monomers including one of several species of butenedioic acid and its derivatives, transition metal salts as catalysts and possibly hypophosphorous acid, phosphorous acid and their salts as well. It is initiated with the addition of guanyl isopropylazo hydrochloride and oxyol and the molecular weight of the polymers is over 800. Therefore, poly (butenedioic acid) with a high molecular weight can be prepared in this method and the common problems of low molecular weight and high molecular weight distribution that exist in current techniques can be effectively solved. And the consequent polymer product performs an active scale-inhibitory and corrosion-inhibitory effect and excellent properties of complex systems.

The invention discloses a method for preparing branched polyacrylonitrile and belongs to the field of macromolecular syntheses and functional polymer preparation. Methacrylic acid sulfhydryl propionyloxy ethyl ester is used as a branching monomer, azodiisobutyronitrile (AIBN) is used as an initiator and N, N'-dimethylformamide (DMF) or sodium thiocyanate aqueous liquid is used as a solvent to implement free radical polymerization with such monomers as acrylonitrile to successfully obtain the branched polyacrylonitrile. The degree of branching of the polymer is adjusted through adjusting molar ratio between the branched monomer and the polymer monomer. The methacrylic acid sulfhydryl propionyloxy ethyl ester with low cost and good storage stability and comprising polymerizable double bonds and chain transfer sulfhydryl is used as the branching monomer to successfully prepare the branched polyacrylonitrile under a conventional free radical polymerization condition. The polymerization is simple and easy; moreover, the monomer conversion rate is high and the degree of branching of the polymer is controllable.

The invention relates to a method which using new ionic liquor polymerization initiation systerm prepares macromolecular compound. The technical matters of this invention needs to settle is providing a bran-new initiation systerm of atom radical transfer free radical polymerization which using ionic liquor as polymerization medium. The characteristic of this invention's method is the polymerization initiation systerm made up of ionic liquor, initiator and catalysator; the general formula of initiation systerm is [mim][RCOO] / R1X / MXn, the [mim][RCOO] is methyl imidazole organic acid salt ionic liquor, R is alkyl group; R1X is initiator, R1 is alkyl, X is halogen; catalysator MXn is transient metal inorganic salt, n is valence number equal to transition metal; initiation systerm reacts whth monomer can prepare the macromolecular compound of this monomer.

The invention relates to a water-in-water type amphoteric polyacrylamide emulsion and a preparation method thereof. The method comprises: neutralizing acrylic acid with sodium hydroxide to obtain a mixture containing acrylic acid and sodium acrylate; mixing the mixture, an acrylamide monomer, a cationic monomer, a compound composed of a nonionic dispersant and an amphoteric dispersant Dispersant, surfactant, at least a part of inorganic salt, hydrophobic monomer, chelating agent and water are mixed uniformly to obtain a solution; the obtained solution is passed through nitrogen to remove oxygen, and then an initiator is added to initiate a polymerization reaction, and then subjected to aging and salting out treatment, A water-in-water type amphoteric polyacrylamide emulsion was prepared. The method of the invention is simple, the raw materials are easy to obtain, the cost is low, the required supporting equipment is less, the on-site operation is convenient, and it has huge economic benefits; the water-in-water type amphoteric polyacrylamide emulsion prepared by the method of the invention has good dispersibility and low apparent viscosity , high dilution viscosity, high active ingredient content, fast dissolution and storage resistance.