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4651 results about "Sodium polyacrylate" patented technology

Sodium polyacrylate, also known as waterlock, is a sodium salt of polyacrylic acid with the chemical formula [−CH₂−CH(CO₂Na)−]ₙ and broad application in consumer products. This superabsorbent polymer has the ability to absorb 100 to 1000 times its mass in water. Sodium polyacrylate is an anionic polyelectrolyte with negatively charged carboxylic groups in the main chain. While sodium neutralized polyacrylic acids are the most common form used in industry, there are also other salts available including potassium, lithium and ammonium.

Preparation method for coating anode material of lithium battery

The invention provides a preparation method for a coating anode material of a lithium battery. The preparation method comprises the following specific steps: (1) weighing a coating material and monomer sulfur; weighing the coating material and the monomer sulfur according to a mass ratio, wherein the mass ratio of the coating material to the monomer sulfur ranges from 1:1 to 1:100; (2) preparing a dispersion solution of the sulfur: dissolving the monomer sulfur into a sodium polyacrylate water solution with the mass percentage of 2%-10% at a room temperature to obtain the dispersion solution of the sulfur; (3) preparing a dispersion solution of the coating material: dissolving the coating material into a surfactant water solution at 20-45 DEG C to obtain the dispersion solution of the coating material; and (4) preparing the coating anode material of the lithium battery. According to the preparation method for the coating anode material of the lithium battery, self discharge of the battery is reduced effectively and the stability of the structure in a charging/discharging process of a sulfur electrode is kept; a sulfur active material prepared by the preparation method is used as a lithium-sulfur secondary battery anode material and the prepared lithium material has a high specific discharge capacity and a good circulating performance.
Owner:CHINA UNIV OF GEOSCIENCES (WUHAN)

Preparation process of wet-process superfine modified calcium carbonate

The invention discloses a preparation process of wet-process superfine modified calcium carbonate. The preparation process comprises the following steps: performing cleaning and screening, rough crushing, fine crushing, dry grinding and grading on calcite ores; collecting fine powder of 600 meshes and preparing slurry with water in such a manner that the solid content is 70%-80%; adding a modifier sodium stearate to the slurry for modification treatment and then performing wet grinding, and adding a grinding medium zirconium oxide microspheres and a dispersant sodium polyacrylate during grinding, wherein the volume ratio of the grinding medium to the slurry is 1: 1.5, and the dosage of the modifier is 0.6%-1.2% of the solid content; and putting the slurry obtained after the wet grinding through a vibrating screen, collecting the obtained wet-process superfine modified calcium carbonate slurry into a slurry barrel for flashing drying, collecting the finished product and packaging. The new preparation process is adopted; the wet grinding-modifying integrated technique and the flashing drying technique are adopted so that the production efficiency is high and the production cost is low; the product has the advantages of small particle size, low oil absorption value, high activity and the like; and the major product quality indices are at the international leading level.
Owner:江西科越科技有限公司

Medical chitosan transparent hydrogel wound dressing as well as preparation and application thereof

The invention relates to a chitosan transparent hydrogel wound dressing for medical use, comprising polyacrylic acid (PAA), polyvinyl ketopyrrolidine (PVP) and chitosan, the weight ratio thereof is 4-20:1.5-15:0.15-3; the wound dressing is transparent flake. The preparation method comprises the following steps: respectively configuring chitosan serum, PVP solution and polyacrylate sodium solution; mixing the 3 solutions and adding evocating agent and cross linking agent to the 3 solutions; pouring the mixture into a mould and obtaining the primary product after reaction at the temperature of 40-75 DEG C; adding preservative to the surface of the primary product and drying the product at the temperature of 40 DEG C; obtaining the wound dressing after cutting, ventilated membrane addition, encapsulation and gamma ray sterilization. The wound dressing can be applied to skin wounds, outside body wounds and tissue engineering. The hydrogel wound dressing of the invention has the characteristics of diminishing inflammation and stanching, and having good hydroscopic property, good conformity and the like, as a result, the wound dressing can partially replace the traditional gauze dressing; the preparation method thereof is simple in operation, low in cost, friendly to the environment and high in economic benefits.
Owner:DONGHUA UNIV

Fruit fresh-keeping paperboard and preparation method thereof

The invention provides a fruit fresh-keeping paperboard and a preparation method thereof. The fruit fresh-keeping paperboard consists of paperboard base paper and fresh-keeping coat which is spread on the surface of the paperboard base paper. The paperboard base paper is mainly made from the waste paper, and the base weight is 90 to 100 g/m2. The fresh-keeping coat mainly comprises the following components in part by weight: 1 part of cristobalite, 0.25 to 1.5 parts of kaolin, 0.005 to 0.01 part of sodium polyacrylate, 0.0003 to 0.0005 part of nisin, 0.0001 to 0.0003 part of natamycin, 0.2 to 0.5 part of oxidized starch and 1.0 to 2.0 parts of water, and the base weight is 5 to 30 g/m2. The waste paper is made into the paperboard base paper through, disintegration, high-consistency slag removal, defibering, low-consistency slag emoval and screening, the cristobalite, kaolin, the sodium polyacrylate, the nisin, the natamycin and water are added into a high-speed dispersion machine to be made into pigment dispersion liquid after being adequately dispersed and filtered, and the oxidized starch and the water are heated to be dissolved to obtain the oxidized starch liquid. The pigment dispersion liquid is mixed with the oxidized starch liquid to obtain the fresh-keeping paint liquid, after being filtered by 180 to 200-mesh sieve, the fresh-keeping paint liquid is spread onto the surface of the paperboard base paper through a spreading machine, and the paperboard base paper with the surface being coated with the fresh-keeping paint is secondarily dried, press finished and decorated to obtain the finished product. The fruit fresh-keeping paperboard has the advantages that the fresh-keeping effect is good, the environment compatibility is good, the fresh-keeping package and the storage and transportation package are integrated, and the continuous mass production can be realized on the papermaking machine.
Owner:ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY +1

Preparation method of aragonite crystal form calcium carbonate

The invention relates to a preparation method of aragonite crystal form calcium carbonate, comprising the following steps: lime is sent into a digestion equipment and added with water for digestion treatment, water and quick lime are added slowly according to the ratio of 3:1 to 5:1, calcium hydroxide emulsion is obtained by filtrating, the calcium hydroxide emulsion is sent into a carbonization equipment, magnesium hydroxide needle crystal is added as a seed crystal, CO2 is injected in the materials which are mixed at the same time, aragonite crystal form light calcium carbonate is obtained by carbonization reaction; the light calcium carbonate screened pulp is sent into a filtration device for dehydrating and calcium carbonate filter cake is obtained; the sodium polyacrylate is added as a dispersant and light calcium carbonate with particle size distribution of 1-2 mum is obtained after grinding, thus obtaining a dispersion liquid product which reachs 70% of solid content or the liquid product is sent into a drying device for drying to obtain light calcium carbonate dry powder. The preparation method enjoys cheap price, simple preparation process and perfect performance, thus being applicable to the industrialized production. The obtained aragonite crystal form calcium carbonate is suitable to be a papermaking coating.
Owner:董承智

Polymeric hydrogel fever cooling patch for children and preparation method thereof

InactiveCN104337796AEffective treatment for feverEffectively treats headaches and relieves heatHydroxy compound active ingredientsAntipyreticSide effectBiocompatibility Testing
The invention discloses a polymeric hydrogel fever cooling patch for children, which is composed of a backing layer, an anti-sticking layer and a hydrogel layer, wherein the backing layer is made from non-woven fabric; the anti-sticking layer is a PET film, a PC film or a PU film; the hydrogel layer comprises the following raw materials in percentage: a macromolecular substance, a moisturizing factor, menthol, borneol, distilled water and ethanol; the macromolecular substance is one or more of sodium polyacrylate, sodium alginate, polyvinylpyrrolidone, sodium carboxymethylcellulose and polyvinyl alcohol; and the moisturizing factor is one or more of glycerol, propylene glycol, polyethylene glycol and olive oil. The fever cooling patch disclosed by the invention, by loading mass water and little natural freshener in polymeric gel, can achieve effects of cooling and relieving fever; the fever cooling patch integrates functions of physical cooling and cooling through the natural refresher, and has excellent biocompatibility; the fever cooling patch is free from toxic and side effects, safe and reliable, capable of physically cooling and relieving pain, remarkable in fever relieving effect, and simple and feasible in preparation process.
Owner:ZHEJIANG OYEAH TECH CO LTD

Composite flocculating agent for processing radioactive elements iron, cobalt, manganese and silver in nuclear waste water and processing method

The invention discloses a composite flocculating agent for processing radioactive elements iron, cobalt, manganese and silver in nuclear waste water and a processing method, which belongs to the technical field of the nuclear waste water treatment. The composite flocculating agent consists of a chemical precipitator and an organic polymer flocculating agent, wherein the chemical precipitator is one or combination of more than one of potassium permanganate, sodium sulfide, sodium carbonate and sodium hydroxide; the organic polymer flocculating agent is polyacrylamide, sodium polyacrylate and / or dimethyl diallyl ammonium chloride; and the processing method comprises the following steps of configuring the composite flocculating agent, charging the composite flocculating agent, regulating a pH value of the solution, mixing, flocculating and filtering. Due to the adoption of the composite flocculating agent and the processing method, multiple radioactive element ions of ultralow trace concentration in the nuclear waste water can be efficiently removed, and advantages such as rapidness and high efficiency in reaction process, charging in one step and little dangerous chemical sludge can be realized.
Owner:NANJING UNIV YIXING ENVIRONMENTAL PROTECTION RES INST

Temporary plugging agent for staged fracturing of horizontal well and preparation method thereof

ActiveCN102199420ALow differential pressureDrilling compositionSodium bicarbonateCross-link
The invention relates to a temporary plugging agent for the staged fracturing of a horizontal well and a preparation method thereof. The temporary plugging agent consists of the following components of guar gum, aluminum oxide, magnesium oxide, an ammonium persulfate microcapsule gel breaker, sodium polyacrylate spherule and sodium bicarbonate according to a mass ratio of 48:107:193:(11-42):24:1.26. The preparation method comprises the following steps of: mixing the guar gum, the aluminum oxide, the magnesium oxide, the ammonium persulfate microcapsule gel breaker, the sodium polyacrylate spherule and the sodium bicarbonate which serve as raw materials uniformly at room temperature according to the ratio, adding the mixture into water slowly with stirring, and stirring for 5 minutes to obtain the temporary plugging agent for the staged fracturing of the horizontal well. The temporary plugging agent is subjected to a cross-linking reaction at the well temperature of between 60 and 80 DEG C to form a rubber plug with a certain strength, the strength of tolerant differential pressure exceeds 30 MPa, and after fracturing construction is performed, the ammonium persulfate microcapsule gel breaker dissolves out and breaks a cross-linking structure of a guar gum cross-linking system.
Owner:PETROCHINA CO LTD
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