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189results about How to "High molecular weight" patented technology

Environment-friendly polyurethane water shutoff material and preparation method thereof

ActiveCN103694676AHigh molecular weightLow steam pressurePrepolymerIsocyanate
The invention belongs to the field of high polymer materials and particularly relates to an environment-friendly polyurethane water shutoff material. The environment-friendly polyurethane water shutoff material is prepared from a polyurethane prepolymer and an additive, wherein the polyurethane prepolymer is prepared from the following raw materials: polyethylene-polypropylene glycol a (functionality: 3-4 and hydroxyl value: 300-500), polyethylene-polypropylene glycol b (functionality: 2-3 and hydroxyl value: 200-400), polyethylene-polypropylene glycol c (functionality: 2-3 and hydroxyl value: 100-200), a water remover and isocyanate; the additive is prepared from the following raw materials: a plasticizing agent, a diluent, a flame retardant, a catalyst and a surfactant. When being injected to a hole or crack, the polyurethane water shutoff material is diffused and solidified in the crack to generate foam with certain strength; molecules of a gel contain a great number of polar groups, so that the environment-friendly polyurethane water shutoff material is high in bonding strength and capable of shutting off the crack, thus playing the water shutoff and consolidation effects. The invention also provides a preparation method of the environment-friendly polyurethane water shutoff material. The preparation method is reasonable in process and easy for industrial production.
Owner:SHANDONG INOV NEW MATERIALS CO LTD

Hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent and preparation method thereof

The invention discloses a hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent. The hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent is characterized by being obtained by carrying out hydrolysis reaction onto graft carboxymethyl cellulose under alkali condition, wherein the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent has the structure shown in the specification; the mass of polyacrylamide is 5%-65% of that of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent; and the mass of the polyacrylic acid is 5%-70% of the that of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent. The hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent disclosed by the invention has the triple characteristic of carboxymethyl anionic group, polyacrylamide and polyacrylic acid. Moreover, the carboxymethyl anionic group, polyacrylamide and polyacrylic acid are linked by chemical bonds, so that the molecular weight of carboxymethyl cellulose is improved and the bonding and bridging flocculation is enhanced. Besides, the soluble pH range of the hydrolysis graft strengthened anionic carboxymethyl cellulose flocculating agent is expanded due to the existence of the grafting chain, and therefore, the pH sensitivity of the flocculation effect of carboxymethyl cellulose is effectively restrained.
Owner:NANJING UNIV

Synthetic method of modified high-toughness epoxy vinyl ester resin

ActiveCN103304749AHigh molecular weightEasy to operatePolyphenyl isocyanateVinyl ester
The invention relates to a synthetic method of modified high-toughness epoxy vinyl ester resin, belonging to the technical field of high-molecular polymers. The synthetic method is characterized by comprising the following steps of: (1) sequentially adding 40%-50% of bisphenol A type epoxy resin, 8%-20% of unsaturated monocarboxylic acid, 2.5%-11% of long-chained saturated dicarboxylic acid, 0.1%-1.0% of catalyst A, and 0.01%-0.1% of polymerization inhibitor into a reaction kettle; (2) controlling the temperature to be 100-130 DEG C to measure an acid value until the acid value is reduced to 10mgKOH/g below; and (3) cooling to about 100 DEG C, then adding 28%-40% of crosslinking agent, 1.0-5.0% of polymethylene polyphenyl isocyanate, and 0.05%-0.5% of catalyst B, and controlling the temperature to be 60-80 DEG C until the measured isocyanato concentration is zero, thus achieving the reaction endpoint. The synthetic method has the advantages that the long-chained saturated dicarboxylic acid is used for partially replacing an unsaturated monocarboxylic acid to react, dilution is carried out before the polymethylene polyphenyl isocyanate is added for chain extension, the chain extension reaction is thorough, and the toughness effect is good. The synthetic method is simple in technology, clear in endpoint, less in side effects, and free from generation of three wastes, and the quality is stable.
Owner:HUACHANG POLYMER EAST CHINA UNIV OFSCI & TECH +1

Polymeric titanium sulfate-PDMDAAC (poly dimethyl diallyl ammonium chloride) composite coagulant as well as preparation and application methods thereof

The invention discloses a polymeric titanium sulfate-PDMDAAC (poly dimethyl diallyl ammonium chloride) composite coagulant as well as preparation and application methods thereof. The preparation method comprises the following steps: 1, preparing a titanium sulfate solution with certain concentration by adding water, placing the titanium sulfate solution in a mixing kettle, dropwise adding a sodium hydroxide solution by controlling certain speed, performing polymerization reaction, stopping adding the materials when the basicity (B) is 0.5-2.5, and continuously stirring for 0.5-1.5h after finishing adding, so as to prepare a colorless and transparent polymeric titanium sulfate solution; 2, placing the prepared polymeric titanium sulfate solution in a mixing reaction kettle, matching according to the fact that the mass ratio of Ti to PDMDAAC is (4-10):1, adding branched-chain PDMDAAC colloid or dry powder under the normal temperature or heating condition; 3, stirring the mixed solution at the normal temperature for 2-4 h, and filtering away insoluble substances, so as to obtain the polymeric titanium sulfate-PDMDAAC inorganic composite coagulant and polymeric titanium sulfate-PDMDAAC organic composite coagulant. The polymeric titanium sulfate-PDMDAAC composite coagulant can be widely applied to fields such as water supply, waste water treatment, papermaking, textile dyeing and printing, and daily-use chemical industry, and has good water treatment effect.
Owner:TONGJI UNIV
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