122 results about "Starch Microspheres" patented technology

The invention discloses a method for preparing starch microspheres, which comprises the following steps of: stirring 20 to 70 percent of plant starch emulsion at the constant temperature in the critical temperature of starch gelatinization for 10 to 30 minutes under the action of 2 to 15 percent of water-soluble thickening agent, standing, cooling naturally, removing supernate, washing, and drying to prepare the starch microspheres. The surfaces of the prepared starch microspheres are smooth, the inner part is hollow, one or more nano-scale micropores are distributed on the surface, the wall thickness is uniform, the grain diameter is between 10 and 100 micrometers, and the wall thickness is between 1 and 10 micrometers. The prepared starch microspheres have a simple preparation process and readily available materials, and are widely applied to fields of medicines, cosmetics, food modifiers, printing ink, papermaking and the like.

The invention discloses a preparation method of a small-crystalline-grain ZSM-22 (Zeolite Socony Mobil-22) molecular sieve. The preparation method comprises the following steps of uniformly mixing a silicon source, a aluminum source, an alkali source, a templating agent and deionized water, to form an initial gel mixture, and then adding one or several of active carbon, graphite, graphene, black carbon, a starch microsphere, chitosan and a polylactic acid microsphere into the initial gel mixture, uniformly agitating an obtained mixture, and then crystallizing the agitated mixture, filtering to separate a solid product, washing the solid product to be neutral by using the deionized water, and drying and roasting the washed solid product, to obtain the small-crystalline-grain ZSM-22 molecular sieve. The preparation method has the advantages that the activity of a catalyst is high; the large-scale industrial production can be realized; the operation charge is low.

The invention discloses a preparation method of a composite hard carbon sodium-ion battery cathode material. The preparation method comprises the steps that boron-doped hard carbon and a carbon source precursor is mixed to be ball-milled according to the mass ratio of (8.5-9.5):(0.5-1.5), a semi-finished product obtained after mixing and ball-milling is calcined at high temperature in a shielding gas atmosphere, and then the material is obtained, wherein boron-doped hard carbon is obtained by dispersing thermoplastic phenolic resin into absolute ethyl alcohol and then adding boric acid and a curing agent through carbonizing under gradual temperature increasing and grounding, and the carbon source precursor is crosslinked starch microspheres prepared by adopting a reverse emulsification method. Compared with the prior art, the preparation method of the composite hard carbon sodium-ion battery cathode material has the advantages that the technology is simple and convenient and easy to operate, the raw materials are wide in source and low in cost, the first-time charging and discharging efficiency is high, the electrochemical performance, the cycle performance and the safety are good, and the product properties are stable.

The invention relates to a preparation method and a refining method of medical hemostatic polysaccharide starch. With pretreated potato starch as a raw material and epichlorohydrin as a crosslinking agent, a microsphere adopting a three-dimensional network structure is synthesized by an emulsifying and crosslinking technology. The medical hemostatic polysaccharide starch is high in biocompatibility; the medical hemostatic polysaccharide starch is full with wrinkles on the surface, so that the particle surface area is increased, the water absorbing rate is significantly improved and the hemostatic time is greatly reduced; the medical hemostatic polysaccharide starch is especially applicable to large-area blood seepage, deep bleeding, and bleeding at a part difficult to reach by operative procedures.

The invention discloses a cross-linked starch microsphere preparation method, which comprises: (1) adding corn raw starch to saccharifying enzyme and alpha-amylase, and carrying out an enzymolysis reaction; and (2) carrying out a cross-linking reaction twice on the microporous starch obtained in the step (1) through inverse emulsion polymerization to obtain cross-linked starch microspheres. According to the present invention, the cross-linked starch microsphere is prepared by replacing the raw starch with the microporous starch with good adsorption through the inverse emulsion polymerization,wherein the cross-linking reaction is performed twice so as to improve the structural stability of the microporous starch microspheres, achieve the uniform particle size distribution, significantly improve the adsorption performance, and broaden the applications of microporous starch in food, medicine, cosmetics, food modifiers, industrial wastewater treatment and other industries.

The present invention relates to a method for synthesizing starch microsphere as adsorption agent, and it is characterized by that the starch microsphere can be synthesized at a certain temperature, in a certain reaction time, under the action of high-effective catalyst and surfactant in the dispersing agent, and the whole reaction can be made within 4 hr, and the sphere-forming time is within an hour. Said invented microsphere can be used as medicine carrier, adsorption agent of several substances of perfume compound, etc. reinforcing agent of weight-reducing food and paper and sewage treating agent, etc.

The invention provides a starch microsphere slow-release fertilizer and a preparation method thereof. The starch microsphere slow-release fertilizer takes a starch microsphere with characteristics of high adsorption capacity and slow-release dissolution as a slow-release material. The preparation method comprises the following steps of: adding starch to a chemical fertilizer water solution, and stirring and heating for gelatinization; synthesizing the starch microsphere loaded with the fertilizer by adopting a reverse emulsion method. The starch microsphere slow-release fertilizer provided by the invention is made from the biodegradable natural starch, is an excellent carrier type slow-release fertilizer with long nutrient release period, low cost, environmental friendliness and the like and has high market application value.

The invention relates to a profile modifying / water plugging agent for an oil well, in particular to grafted polymer microspheres for oil displacement modification and a preparation method thereof. The grafted polymer microspheres are prepared from etherified starch, acrylamide, N,N-methylene bisacrylamide and ammonium persulfate in the mass ratio of (1-2) to (0.5-1.5) to (0.04-0.2) to (0.1-0.5). The polymer microspheres have the advantages of controllable particle size, high homogeneity, high temperature resistance, high salt resistance, wide raw material source and low manufacturing cost, is not hydrolyzed in a severe saline environment, and is non-degradable; starch microspheres can further go deep into an oil reservoir after being swelled by absorbing water; meanwhile, the polymer microspheres have the rigid characteristic of starch micro molecules and the flexible changeability characteristic of the acrylamide, have high deepening and blocking performance, and are environmentally friendly; by adopting the grafted polymer microspheres, the non-homogeneity of a rock stratum is lowered, and the crude oil recovery factor is increased.

The invention provides a preparation method of modified starch styptic powder. The prepared modified starch styptic powder is starch microspheres modified through cross-linking. The preparation technology of the modified starch styptic powder comprises the steps that starch with the molecular weight ranging from 5,000 to 3 million is dissolved in water, the mass concentration ranges from 0.01% to 10%, gelatinization is conducted for 10-200 min at 30-100 DEG C at the stirring speed ranging from 100 rpm to 6,000 rpm, and after the solution is mixed to be uniform, a cross-linking agent is added, wherein the mass ratio of the cross-linking agent to the starch ranges from 100:1 to 10:1; stirring is continuously conducted for 0.5-5 h, spray drying is conducted, the airflow velocity of spray drying ranges from 1 L / min to 100 L / min, and the air temperature is 50-200 DEG C; modified starch particles subjected to spray drying are collected, and the modified starch styptic powder microspheres with the particle size ranging from 5 micrometers to 1,000 micrometers are obtained.

The invention discloses a porous magnetic starch microsphere and a preparation method thereof. The method is characterized in that organic peroxide-surface modified Fe3O4 magnetic particle is used as a nucleus, mineral oil is used as a continuous phase, starch molecules and the magnetic nucleus are combined through reversed-phase polymerization reaction to form a magnetic starch micro sol particle with a nuclear-shell structure, the starch molecules on a shell layer are subjected to cross-linking reaction under the action of cross-linking agent-epoxy chloropropane, so that the magnetic starch micro sol is gelatinized to obtain magnetic starch micro gel, then the magnetic starch micro gel is subjected to demulsification, washing, magnetic separation, supercritical CO2 extraction and drying to obtain the porous magnetic starch microspheres. The porous magnetic starch microsphere is round, has uniform particle size, narrow pore size distribution, large specific surface and high mechanical strength, and the porous magnetic starch has a magnetic guiding function and a flexible and strong adsorption loading function, and has wide application prospect in the fields of sewage treatment, targeted drugs, catalytic industry, environment monitoring, immobilized enzymes and the like.

This invention relates to a synthetic method of hud type starch microsphere. First carry out fully microwave dispersing to titanium dioxide, sodium silicate and de-ionized water, obtain TiO2 gel; blend soluble starch and de-ionized water, gain starch solution; intensive mixing cyclohexane, initiator, emulsifying agent, add TiO2 gel, then add cross-linking agent N, N -methylene bisacrylamide and starch solution, take reaction for 3 to 4 hours; finally stop whip, cooling, standing, by centrifugal to remove oil phase; use ethyl acetate, acetone, dehydrated alcohol in turns and abundantly to wash obtained precipitate, gain white go as far as yellowish product, vacuum drying.

The invention discloses a preparation method of quaternary phosphonium cation starch microspheres. The method comprises the steps that: (1) starch, cation monomers, and acrylamide are weighed; (2) the starch is prepared into a paste by using water; the cation monomers and acrylamide are delivered into the paste; N,N'-methylenebisacrylamide is added to the mixture; an oxidizing agent is added to the mixture; the mixture is uniformly mixed, such that a dispersed phase is formed; (3) a disperse medium is adopted; an inverse suspending dispersing agent is added to the disperse medium; the mixtureis heated, such that the dispersing agent is dissolved; (4) the dispersed phase is added to the disperse medium, and the mixture is uniformly mixed by stirring, such that a water-in-oil suspension liquid is formed; nitrogen is delivered in for removing oxygen; or a reducing agent can be added, and a reaction is carried out for 0.5-5h under a temperature of 0-60 DEG C; (5) when the reaction is finished, the temperature is reduced, oil and water phases are separated; and the material is washed, such that the cation starch microspheres are obtained. The technology provided by the invention is simple, and is suitable for industrial productions. The cation starch microspheres provided by the invention is advantaged in high absorbency and good thermal stability.

The invention discloses a preparation method and applications of a hemostatic material. According to the invention, by using a microsphere surface modification method, the modified starch of a modified starch microsphere shell layer is activated and coupled with chitosan amino to obtain modified starch hemostatic microspheres with the surface modified with chitosan, wherein the modified starch microspheres have good water absorption performance and can rapidly absorb moisture in blood and concentrate blood coagulation factors so as to achieve the rapid hemostatic effect, the chitosan modification can enhance the hemostatic effect, activate blood coagulation factors and form blood coagulation blocks so as to promote blood coagulation, and chitosan has a certain antibacterial activity, so that the modification of the surface with chitosan can reduce the infection risk, the addition amount of chitosan can be reduced through surface modification, and the water absorption performance and the degradation and absorption performance of the modified starch microspheres are influenced to the minimum extent; and the hemostatic powder prepared by the invention can be used for quickly stoppingbleeding of bleeding parts such as body surfaces, in-vivo tissues, organs and the like, has a certain antibacterial function, and reduces the wound infection risk.

The invention provides a preparation method of magnetic cationic starch microspheres, which comprises the following steps: (1) synthesis of cationic starch: weighting starch, adding 2,3-epoxypropyltrimethyl ammonium chloride, stirring, mixing, then adding a sodium hydroxide solvent, stirring, reacting at the temperature of 70 DEG C, washing with absolute ethyl alcohol, performing vacuum drying in a dryer to obtain the cationic starch; (2) preparation of an iron salt solvent: adding ferric trichloride and ferrous chloride into water to obtain the iron salt solvent; (3) synthesis of the magnetic cationic starch microspheres: weighting a cationic starch sample, adding water, stirring uniformly to obtain a cationic starch solvent; adding the iron salt solvent obtained in the step (2) into the cationic starch solvent to react, filtering, washing with the absolute ethyl alcohol, drying, grinding, sieving to obtain the magnetic cationic starch microspheres. The invention is simple in operation, the distribution of the grain sizes of the prepared magnetic cationic starch microspheres is uniform; the magnetic cationic starch microspheres have the advantage of good adsorptive performance and the magnetic separation is easy to realize.

The invention discloses a novel HA (humic acid) / starch composite microsphere. HA is introduced into a starch microsphere, HA and soluble starch are taken as raw materials, MBAA (N,N-methylene bisacrylamide) is taken as a cross-linking agent, potassium peroxodisulfate / sodium hydrogen sulfite is taken as an initiator, Span-80 and Tween-20 in a certain mass ratio are taken as emulsifiers, liquid paraffin is selected as an oil-phase dispersing agent, and the HA / starch composite microsphere is prepared with an inverse emulsion polymerization synthesis method. The methods have the advantages that the raw materials are cheap and widely sourced, reaction conditions are mild, environmental friendliness is realized, and the operation method is simple.

The invention discloses starch microsphere hemostatic powder with antibacterial activity and application thereof. The preparation method of the hemostatic powder comprises the following steps of adopting soluble starch as a raw material and sodium trimetaphosphate as a crosslinking agent for preparing starch microspheres with a three-dimensional network structure by means of a reverse emulsification crosslinking approach; adding the prepared starch microspheres into a lysozyme solution to obtain the lysozyme-loaded antibacterial starch microsphere hemostatic powder. The preparation method is simple, and the prepared lysozyme-loaded antibacterial starch microsphere hemostatic powder has excellent hemostatic performance, high bacteriostatic activity and high biocompatibility and can be degraded and absorbed by the human body.

The invention relates to the field of petroleum engineering oilfield chemistry and discloses a nanometer starch microsphere filtrate reducer for a water-based drilling fluid, a preparation method thereof and the water-based drilling fluid. The nanometer starch microsphere filtrate reducer is prepared by dropwise adding a starch-containing alkaline solution into a continuous phase containing continuous phase oil and emulgator under the existence of cross-linking agent and initiator, reacting and centrifugally separating. The nanometer starch microsphere filtrate reducer is characterized by average grain diameter of 50-1000nm, swelling degree of 200-600%, total pore space volume of 0.5-4mL / g and capacity of resisting against temperature at 150 DEG C or above. According to the invention, thenanometer starch microsphere is used as a filtrate reducer, so that the leak-off of drilling fluid can be more effectively controlled, and meanwhile, temperature resistance can be obviously promoted,influence on viscosity of drilling fluid is smaller, and an excellent blocking effect to micropores and cracks on floor can be achieved. The nanometer starch microsphere has the advantages of biodegradability, environment-friendly property, extensive source and simple preparation process.

The invention provides a full-starch degradable plastic. The full-starch degradable plastic is characterized in that the full-starch degradable plastic is composed of 25-80mass% of a rice starch microsphere, 5-10mass% of ethyl cellulose, 2-5mass% of a plasticizer dibutyl phthalate, 1-3mass% of a stabilizer sorbitol and 1-2mass% of a lubricant magnesium stearate. Rice starch is processed to prepare starch microspheres, and the starch microspheres are denatured starch prepared through a step of the appropriate cross-linking of a cross-linking agent with the hydroxy group on a raw material starch under the action of an initiator and a step of microspheroidization, and are a novel environmentally-friendly adsorption material developed in recent years. The starch microspheres have the advantages of good adsorptivity, good compressive property, good biodegradability and good biocompatibility.

The invention discloses a hydrocarbon reservoir protection material as well as a preparation method and application thereof. The hydrocarbon reservoir protection material comprises starch-containing microspheres and water-soluble modified starch, based on the total weight of the hydrocarbon reservoir protection material, the content of the starch-containing microspheres is 40-80 wt%, the content of the water-soluble modified starch is 20-60 wt%, and the preparation method comprises a step of uniformly mixing the starch-containing microspheres with the water-soluble modified starch to obtain the hydrocarbon reservoir protection material. The invention also relates to an application of the starch microspheres in a hydrocarbon reservoir protection temporary plugging agent. The hydrocarbon reservoir protection material has the advantages of simple components, efficient performance, environmental friendliness, low cost and the like.

The invention discloses a starch microsphere and a preparation method thereof. The starch microsphere comprises the following raw materials, in parts by mass: 3.04 to 3.35 parts of waxy corn starch, 0.010 to 0.027 part of a glucoamylase enzyme, 0.001 to 0.020 part of an alpha-amylase enzyme, 0.0015 to 0.0017 part of anhydrous calcium chloride, 0.01 to 0.12 part of citric acid, 0.02 to 0.18 part of sodium hydrogen phosphate, 0.07 to 0.61 part of N'N-methylene bisacrylamide, 0.014 to 0.181 part of ammonium ceric nitrate, 0.484 to 0.489 part of Span 60 and 0.322 to 0.326 part of Tween 60. The preparation method is that the waxy corn starch is used as the raw material, after an enzymatically hydrolyzed starch is prepared by a double enzymatic hydrolysis method, the enzymatically hydrolyzed starch is crosslinked by an inverse suspension emulsion method, and the starch microsphere with porous structure, large porosity and large surface area is obtained.

The invention aims to provide a method of controlling the grain size of starch microspheres so as to further prepare monodisperse nano starch microspheres in different grain sizes. The technical scheme provided by the invention is as follows: the preparation method comprises the following steps: preparing a starch solution; adding a water soluble surfactant and inorganic salt into the starch solution to obtain a water phase matter; adding an oil soluble surfactant and a co-surfactant into an organic solvent to obtain an oil phase matter; and mixing the water phase matter with the oil phase matter to obtain a water in oil starch microemulsion, cross-linking and solidifying, collecting precipitates, and washing and drying the precipitates to obtain white-to-yellowish powder which is the monodisperse nano starch microspheres. According to the preparation method provided by the invention, the grain size of the starch microspheres can be precisely controlled within a certain range (20-200nm) through selection of reaction raw materials and control of technical conditions, and the grain size is distributed in a monodisperse mode. The starch microspheres can be used as a carrier of a medicine, has better targeting and is oriented to a special organ or focus part.

The invention discloses a preparation method of efficient-adsorption modified starch microspheres, adsorptive modified starch microspheres prepared by the method and an application method of the modified starch microspheres. According to the preparation method, starch, carbamide and phosphoric acid are synthesized at a certain reaction condition to obtain phosphoric acid-starch carbamate, thus greatly improving the adsorbing capacity; meanwhile, a urethane group is introduced, so that the water solubility of the phosphoric acid-starch carbamate is improved, thereby influencing the separation between the phosphoric acid-starch carbamate and a water solution. According to the preparation method, starch microspheres are prepared firstly, and then phosphoric acid-starch carbamate starch microspheres are prepared through a one-step method by taking the starch microspheres, carbamide, phosphoric acid and sodium citrate as raw materials. Due to the adoption of microsphere molecules, the adsorbing capacity is greatly improved. The modified starch microspheres prepared by the method is especially applicable to adsorption treatment of printing and dyeing wastewater.

The invention provides porous starch and a preparation method thereof. Since the sweet potato starch content is as high as about 30%, sweet potatoes serve as a raw material, an enzymatic degradation process is adopted, and by adjusting preparation process conditions and adding appropriate additives to control starch microsphere grain sizes and micropore structures, the porous sweet potato starch is prepared. The porous starch is low in production cost and easy to industrialize.

The invention discloses a method for methylene blue dye wastewater treatment. Mung bean starch is treated by using anhydride to prepare pretreated starch; porous starch microspheres are prepared through an epoxy chloropropane cross-linking method; the surfaces of the porous starch microspheres are coated with silicon oxide through an in-situ reaction method, and the porous silicon oxide coated starch microspheres are prepared; a ferric trichloride solution and the porous silicon oxide coated starch microspheres are cross-linked under the action of a glutaraldehyde solution, and a composite adsorbent is prepared; the prepared composite adsorbent is added into methylene blue wastewater with the dye molecule concentration being 50-110 mg / L, the pH value of the wastewater is adjusted to 7-11, stirring is conducted for 30-40 minutes, then the composite adsorbent is separated, the separated wastewater meets emission standards, and the composite adsorbent absorbing methylene blue dye molecules is recycled after desorption. According to the method, the methylene blue dye molecules in the wastewater can be effectively removed, the decoloring effect is good, the adsorption capacity of the adsorbent in use is large, and no secondary pollution is caused to a water body.

The invention discloses a method for preparing hydroxypropyl-beta-cyclodextrin by catalysis of starch microsphere supported calcium hydroxide. The method comprises the following steps of: adding beta-cyclodextrin, propylene oxide, a catalyst and water serving as a reaction solvent into reaction equipment, and reacting under certain pressure condition, wherein the reaction temperature is controlled to effectively improve the yield and the purity of the product; quickly drying the reaction product by using a spray dryer to obtain the finished product hydroxypropyl-beta-cyclodextrin. The product has the advantages of low water content, uniform particle size distribution, high whiteness, moderate substitution degree, moderate fleeciness feeling and the like, the purity of the product reaches over 99 percent, and the total yield of the reaction is over 95 percent.

The invention discloses a hydrocarbon reservoir protection material as well as a preparation method and application thereof. The hydrocarbon reservoir protection material comprises starch-containing microspheres and water-soluble modified starch, based on the total weight of the hydrocarbon reservoir protection material, the content of the starch-containing microspheres is 40-80 wt%, the content of the water-soluble modified starch is 20-60 wt%, and the preparation method comprises a step of uniformly mixing the starch-containing microspheres with the water-soluble modified starch to obtain the hydrocarbon reservoir protection material. The invention also relates to an application of the starch microspheres in a hydrocarbon reservoir protection temporary plugging agent. The hydrocarbon reservoir protection material has the advantages of simple components, efficient performance, environmental friendliness, low cost and the like.

The present invention provides a special fruit detergent preparation method, which comprises: weighing cassava starch to a proper amount of water, adding 0.1 mol / L sodium hydroxide to adjust the pH value to about 8, adding castor oil and an appropriate amount of sorbitol fatty acid ester, carrying out stirring dissolving, adding a mixture of polyethylene glycol 600 and glycerin (4:1), carrying out a reaction for a certain time, standing, carrying out centrifugation, washing, drying to obtain light yellow starch microspheres, and uniformly mixing 30-90% by mass of the starch microspheres, 5-10% by mass of sodium chloride, and a proper amount of water to obtain the detergent. According to the present invention, the starch microsphere technology is adopted to prepare the nature detergent, chemical surfactants and detergent components do not exist, the detergent is pure nature, and starch has an unique absorption characteristic so as to effectively remove difficultly cleaning fruits; and the raw materials are easy to obtain, the cost low, the price is low, and the method is suitable for commercial promotion use.

The invention discloses a hydrocarbon reservoir protection material as well as a preparation method and application thereof. The hydrocarbon reservoir protection material comprises starch-containing microspheres and water-soluble modified starch, based on the total weight of the hydrocarbon reservoir protection material, the content of the starch-containing microspheres is 40-80 wt%, the content of the water-soluble modified starch is 20-60 wt%, and the preparation method comprises a step of uniformly mixing the starch-containing microspheres with the water-soluble modified starch to obtain the hydrocarbon reservoir protection material. The invention also relates to an application of the starch microspheres in a hydrocarbon reservoir protection temporary plugging agent. The hydrocarbon reservoir protection material has the advantages of simple components, efficient performance, environmental friendliness, low cost and the like.

The invention discloses micron-order crosslinked starch microspheres and a preparation method and application thereof. The raw materials of the starch microspheres comprise: 100 parts of deionized water, 1-20 parts of starch, 10-50 parts of triethanolamine, 0.105-14.6 parts of epichlorohydrin, 200-1000 parts of an alkane compound, 8-250 parts of an emulsifier, 0.05-10 parts of a zwitterionic surfactant, 0.5-200 parts of an inorganic salt solution and 200-1000 parts of an organic solvent. The starch microspheres have a particle diameter of 0.1 to 500 [mu]m and have a polydispersity characteristic that the particle sizes are uniformly distributed.

The invention discloses a preparation method of efficient fertilizer capable of improving downy mildew resistance of cucumbers. A traditional Chinese medicine extract and a bactericide are subjected to ultrasonic dispersion treatment by the aid of soluble micromolecular chitosan and starch microspheres, slow-release disease control factors easy to absorb and use are obtained, long-term absorptionand utilization of the slow-release disease control factors are facilitated in the cucumber growth process, the planting workload due to repeated fertilization is avoided, and the resistance of cucumbers to downy mildew can be improved; the slow-release disease control factors are dried into powder with a freeze drying technology, drying is quick, granules are fine and cannot agglomerate to form cakes, and active ingredients are not damaged. Composted animal waste and edible fungus waste are mixed and added, the nutrient elements of the efficient fertilizer are enriched, the fermentation speedof the efficient fertilizer can be increased, the fermentation composting time can be shortened, and the preparation efficiency of the efficient fertilizer is improved.