The method for obtaining hollow microspheres |
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IPC classes for russian patent The method for obtaining hollow microspheres (RU 2138521):
The method of obtaining medicinal healing sponges / 2104008
The invention relates to pharmaceutical industry
 Absorbent polymer composition / 2091081
The invention relates to an improved particulate, absorbent, polymeric compositions
 Composition for microporous material krasavicaaaaa / 2057150
The invention relates to the production of PVC plastisols with coloured compounds, which serve as the basis for the manufacture of krasavitsa materials in the form of various rollers of printing machines, stamp pad, marking stamps, etc
 Powdered resin, the method of receiving the product / 2106153
The invention relates to a powdered crosslinked polymers, absorbent fluid and blood /superabsorbents with improved properties in respect of swelling and retention with respect to aqueous liquids under load; the method of obtaining these polymers and their use in absorbent products sanitation, as in baby diapers, incontinence /incontinence/ adult hygiene items for women, and also for covering wounds
Method of granulating blocked
 -caprolactam toluylene diisocyanate / 2080913
The invention relates to a technology for granulated blocked with e-caprolactam toluylene diisocyanate for use in the manufacture of tires, rubber products and other materials
Method of granulating polyolefins / 2015144
The invention relates to a method for granulating polyolefins and can be used in the production of granular polymers
Method of microencapsulation of solid materials and hydrophobic liquids / 2132224
The invention relates to methods of microencapsulation of various substances, in particular pigments and dyes, as well as their solutions in mineral and vegetable oils, organic solvents
 Pharmaceutical composition with lipid system / 2128505
The invention relates to pharmaceutical compositions that contain a defined lipid system of at least two lipid components, where at least one of the lipid components is aliphatic and polar and one nonpolar, in which the pharmaceutically active compound is heparin, its fragment or derivative
 Microcapsules, composition and method of treatment of oil wells / 2111049
The invention relates to compositions and methods for drilling wells
 Capsule dosed release / 2104084
 Discrete microsphere and the method for the discrete microspheres (options) / 2096453
The invention relates to the process of obtaining nutritional supplements feed containing beneficial microorganisms
 Device for dispersing and microencapsulation hydrophobic liquids / 2096074
The invention relates to dispersing equipment and can be used for the production of microcapsules containing a hydrophobic liquid with dissolved therein targeted supplements, such as color-forming components, drugs and other
 Method of making polymer beads / 2093865
 Device for capsulating granular material / 2091155
The invention relates to capsulerebel solids and can be used in construction, chemical, pharmaceutical, food and other industries
Method of producing coated heart-shaped particles / 2286845
Method comprises dispersing water emulsion of hydrophobic polymer in a liquid immiscible with water containing emulsifier, producing the emulsion with enriched phase that comprises water dispersed phase containing the hydrophobic polymer, and inducing inter-phase reaction of polycondensation at least of one of the reagents of the inter-phase polycondensation to produce polymeric film around the hydrophobic polymer.
Composition of microcapsulated binder (variants), method for preparation thereof, and substrate / 2293093
Invention relates to cross-linkable polymeric binders, in particular to microcapsulated binders and produce containing such microcapsulated binder, and discloses composition of microcapsulated binder characterized by that binder forms in situ in capsules and comprises: essentially water-insoluble binder-forming material of core, which core includes at least first addition-type prepolymer, vitrification temperature of homopolymer Tg being less than about 0°C, inflammation temperature at least 75°C, and boiling temperature at least 175°C (at atmospheric pressure); solvent for binder-forming material of core, said solvent being essentially water-soluble and not reacting with prepolymer material; essentially water-insoluble free-radical-initiating substance in amount high enough for efficient catalysis, said substance being, in particular, azo-type initiating substance with half-life period at least 1 h at 25°C, which is soluble in prepolymer material to be polymerized and in solvent. Microcapsules are prepared by composing aqueous mixture comprising colloidal dispersion of microcapsule wall-forming material. In order to obtain core material particles less than about 250 μm in size, aqueous solution is subjected to vigorous stirring. Stirring at a first temperature leads to formation of microcapsule wall from microcapsule wall-forming material, while heating to a second temperature provides polymerization of prepolymer material of the core to form binder in microcapsule. Formation of the binder in microcapsule as well as microcapsuled binder composition and substrate are also described.
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(57) Abstract: Describes the method for obtaining hollow microspheres by mixing liquid rezol phenol-formaldehyde resin, poroporo and surfactant, heating the mixture until the temperature of the beginning of decomposition of porofor followed by sputtering in the hot gas environment, curing and drying of the resulting microspheres. Pre-mix porofor, surfactant, optionally enter the water as a dispersing agent in an amount of 0.01-150 wt.h. on 100 wt.h. poroporo, stirred until a finely dispersed state, the resulting mixture is introduced into a phenol-formaldehyde resin followed by heating, spraying, curing and drying of the resulting microspheres. The technical result - obtaining microspheres with lower density. 1 C.p. f-crystals, 1 table. The invention relates to methods of producing hollow microspheres (microspheres) on the basis of liquid phenol-formaldehyde resin (hereinafter FSF). Microspheres used to solve environmental problems as a sorbent spill of oil and oil products in water bodies; to facilitate the process of drilling oil and gas wells as a component of drilling mud; and materialov. In AVT. St. USSR N 806101, publ. G., a known method of producing microspheres by spraying under pressure, the composition of the liquid CFF, poroporo and surfactants (hereinafter - surfactant) in the hot gas environment, followed by curing and drying of the microspheres. Spraying carry out water vapor with a temperature of 120-140oC at a pressure of 0.6 to 1.0 ATM. However, application of this method is limited by the method of spraying only pneumatic action, in which the crushing factor in high-speed gas flow, characterized by a large variation in the size of the sprayed droplets and obtained from them microspheres. In the application of the RF N 95117566, publ. 97, provided the method of producing microspheres by spray drying, in which a liquid product is cured in the flow of gaseous drying agent with separation of solidified particles of the finished product from the spent drying agent in the wet. However, wet separation requires the introduction of the flow chart of the additional stage of drying of the microspheres and the additional cost of energy, which significantly increases the cost of the microspheres. In addition, the method is environmentally unfriendly, since the proposed method to image the CF N 1090432, publ. G., declared closest technical solution - a method of producing microspheres by spraying the composition consisting of the FSF, poroporo and surfactants, brought to foamy state, with a density of 0.4 to 0.9 g/cm3and the size of gas bubbles 5-140 μm in the hot gas environment, followed by curing and drying of the microspheres. Stage of homogenization of the composition, i.e., obtain a foam structure with small bubbles of gas specified size, is carried out in a mixing and dispersing agents by high-intensity mixing (the mixer rotation speed 2800 rpm and more). This method has several disadvantages. Sequential or simultaneous introduction of poroporo and surfactant directly to the FSF does not allow to achieve a uniform distribution of all components relative to each other, i.e., the dispersed state of the processed composition. This leads to the production of microspheres with large differences in density, namely, microspheres with a density of fine particles less than 60 microns in several times more than the density of large microspheres with a size of 150-200 microns, and more. In addition, to bring the mixture to a fine state this method requires the use of additional and complex the equipment is and permitted by the technical conditions of production fluctuations in the viscosity of the FSF such actuators must be adjustable, i.e. expensive. This method is limited to use for its implementation spray dryers with pneumothoraces. When implementing the method on modern boot with the disk and the combined dispersion in the finished product produces a significant proportion of defective microspheres monolithic or fully inflated particles. The technical objective of the proposed method is the creation of a technology in which the processed composition at the stage of mixing must be brought to a fine state that, in the end, allows to obtain microspheres with lower density. The technical result is achieved in that in the preparation of the composition of pre-mix porofor and surfactant and the mixture is further added water in an amount of 0.01-150 wt. hours at 100 wt. hours of poroporo, continuing the stirring until a finely dispersed state. The mixture of these three components is introduced into the FSF and under stirring and heated to prepare the original foam composition for spraying. In the application of the RF N 95119248, publ. G., provides that for purposes of more light microspheres, i.e., microspheres with lower density, in the FFS impose additional hydroxide of an alkali metal. Introduction readvariable mixing poroporo, Surfactants and water as a dispersing agent enables you to evenly distribute these components relative to each other, which cannot be achieved by the method declared in the prototype. With the introduction of water into the mixture of poroporo and surfactants porofor, powder-like structure which is prone to caking and clumping, moistened and thoroughly frays. The addition of water reduces the strength of adhesion and friction between particles of poroporo and poroporo and surfactants for their distribution relative to each other to fine mass. This fine mass, consisting of poroporo, surfactant and water with fixed content, is well combined with the FSF, forming a stable system. In this system, when heated to the temperature of the beginning of decomposition of poroporo (70-90)oC due to decomposition of poroporo and gas evolution appears a lot of evenly distributed in the total mass of small bubbles of gas. Due to the presence of surfactants, the composition becomes stable foam structure. Preparation of original compositions can be carried out in vessels with simple low shear mixers anchor or frame types. This ensures getting homogeneous composition is AI every drop of this song becomes a model of the entire original composition ratio of the components: CFF - porofor - water - surfactant or CFF - porofor - water - surfactant is an alkali metal hydroxide. In the drops more accurately maintained the initial ratio of the composition compared to the prototype. When inflating the small droplets have the same conditions to blow that big, and once cured, they form microspheres over inflated, i.e., with lower density. Liquid CFF is an aqueous solution polycondensation products of phenol and formaldehyde and contains the limit (maximum at room temperature) of water. Adding water directly to the resin, and prepared the prototype composition even in small quantities leads to stratification of the system and, when followed by stirring to obtain unwanted emulsion. Thus, the technology of preparation of the composition of the prototype does not allow introduction of water into the resin or composition. The inventive method allows you to enter in the composition of the water without subsequent stratification and the formation of the emulsion: when bringing the composition to fine condition formed surface forces, physically connecting the water with all of the components of the composition, resulting in the processing of ptx2">The number of additionally introduced into the composition of water is determined by the properties of the feedstock. In the case of low-viscosity surfactant, at their big content in the composition, and in the case of porofor with high humidity the necessity of introduction of the water decreases. As increasing the viscosity of the applied surfactant increases the required amount added to the composition of water. In the case of PAHs in the solid state the need for the introduction of water maximum. But the introduction of more water (more than 150 wt.h. 100 mass.h. poroporo) is impractical due to the beginning of the stratification system on water and resin parts. As surface-active substances are used as ionic and nonionic PAV s, for example, nonionic mixture of polyethylene glycol ethers of mono - and dialkylphenols technical grade OP-4 (TU 6-02-997-75), and ionic, for example, a mixture of benzosulfimide methyl-diethylaminomethyl derivatives of polyethylene glycol ethers of ALKYLPHENOLS technical grade Equalizer And (GOST 9600-78). As porofor use azodiisobutyronitrile somaclonal acid technical grade 3-57 (TU 6-03-365-78). Example 1. In capacity is brand BJ-3 GOST 4559-78) and pre-mixed for 20 min with 5 wt.h. poroporo 3-57, 1 wt.h. Surfactant OP-4 and 5 wt.h. water in a low-speed mixer with rotary speed of 60 rpm Composition in the vessel is stirred for 0.5-1.5 h while heating to a temperature of 30-40oC. After that, to obtain a foamy structure composition serves a pump-coil heat exchanger and heated to a temperature of 70 - 90oC and then fed into the atomizer mounted in the drying chamber. The foam composition is sprayed into the heated environment of the combustion gases, the temperature at the inlet into the drying chamber set 380-420oC. Cured and dried in the drying chamber unloaded microspheres and analyze the indicators adopted for assessing the quality of the microspheres: a density based method, the particle size distribution by the method of wet sieve analysis. Examples 2, 3, 4, 5, 6, 7, 8 carried out analogously to example 1. The number and ratio of components, and the properties of the obtained microspheres are shown in table. As can be seen from the table, the obtained microspheres by the present method have a density of 1.10-1.25 times lower than the microspheres obtained according to the method described in the prototype, and 1,10-1.28 times lower when additional vvedennoi phenol-formaldehyde resin, poroporo and surfactant, heating the mixture until the temperature of the beginning of decomposition of porofor followed by sputtering in the hot gas environment, curing and drying of the obtained microspheres, wherein the pre-mix porofor, surfactant, optionally enter the water as a dispersing agent in an amount of 0.01 - 150 wt.h. on 100 wt.h. poroporo, stirred until a finely dispersed state, the resulting mixture is introduced into a phenol-formaldehyde resin followed by heating, spraying, curing and drying of the obtained microspheres. 2. The method according to p. 1, characterized in that the liquid rezol phenol-formaldehyde resin is further added alkali metal hydroxide.
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