772 results about "Creaming" patented technology

According to the stable organic silicon emulsion and the preparation method thereof provided by the invention, polyglycerol ricinoleate with different polymerization degrees, polydihydric alcohol oleate with different molecular weights and silicon polyether are introduced, so that the emulsifying capacity of the emulsion is improved, and the stability of the emulsion is improved; the polyglycerol ricinoleate serving as an emulsifier and a stabilizer can disperse water-soluble substances and oil-soluble substances, so that all the components are uniformly mixed, the emulsification is more sufficient, and the stability of the emulsion is improved; the emulsion enters the emulsification pump for emulsification under the condition of high rotating speed, so that the particle size of the emulsion is smaller, and the stability is better.

The invention discloses a high-stability endotoxin-free PHA nano-emulsion and a preparation method thereof, and belongs to the technical field of biodegradable high polymer material compositions and processing thereof. The nano-emulsion is characterized in that the endotoxin content is not higher than 0.10 EU / g, the median particle size d50 is 100-200 nm, and the PDI is not higher than 0.15, and the nano-emulsion is stable in long-term storage. The preparation method is a continuous solvent-free process and comprises the steps of melt extrusion, high-pressure thermal emulsification and deep endotoxin removal. By adopting the specific pH-insensitive cationic polymer emulsifier and the crystallization inhibitor, the chemical contradiction that an efficient alkaline purification process is incompatible with a nano-emulsion stable system is solved, physical aging is inhibited, and an unexpected technical effect is obtained. The invention also discloses an O / W type cream containing the nano emulsion.

The invention discloses a method for determining the critical safety diameter of an emulsion drop of a liquid energetic material synthesis reaction conveying pipeline, which comprises the following steps of: curing and heating a sampled emulsion, determining pyrolysis kinetic parameters of the detected emulsion, constructing a heat production and heat transfer heat insulation system model of a mixed solution of an acid ester emulsion and the emulsion drop by utilizing Comsol, and determining the critical safety diameter of the emulsion drop of the liquid energetic material synthesis reaction conveying pipeline. Calculating a temperature rise change rule of the mixed liquid heat insulation system under different emulsion droplet sizes, determining a function relationship between the emulsion droplet particle size and the temperature rise of the mixed liquid heat insulation system, and deriving to obtain the critical safety diameter of the emulsion droplet; the method comprises the following steps: adsorbing emulsified liquid by using a porous particle material, testing whether the emulsified liquid explodes due to collision and friction of emulsified liquid with different pore diameters at different rates in an impact tank-piston device to obtain the relationship among the movement rate of emulsified liquid drops, the particle size of the emulsified liquid drops and the explosion risk, and determining the explosion risk of the emulsified liquid drops under a specific conveying speed condition according to the relationship. The liquid energetic material is used for synthesizing the optimal size of emulsified liquid drops in a reaction mixed solution.

The invention relates to the field of hydrogel materials, in particular to a preparation process of intragastric volume hydrogel, a product and application. The preparation process comprises the following steps: S1, preparing a KGM filtrate: adding konjaku flour into an acid solution for swelling, performing high-temperature treatment after swelling, and then adding an alkali solution to terminate the reaction to obtain the KGM filtrate; s2, preparing an oil phase mixture; s3, preparing KGM particles: mixing the oil phase mixture and the KGM filtrate, stirring and emulsifying, and then adding a cross-linking agent for cross-linking reaction to obtain the KGM particles; s4, hydrogel preparation: washing the KGM particles, and freeze-drying to obtain KGM microspheres, namely a hydrogel product. According to the invention, the konjac flour is selected as a main raw material to prepare the intragastric volume hydrogel particles, and the obtained product has good hydrophilicity, different swelling characteristics and an adjustable degradation period, can prolong the emptying time of the hydrogel in the stomach, and has a wide application prospect.

The invention provides a pregabalin slow-release type dissolving microneedle patch based on PLGA microspheres as well as a preparation method and application thereof. The method comprises the following steps: dissolving pregabalin and hyaluronic acid in deionized water to form an inner water phase (W1); dissolving PLGA in dichloromethane to form an organic phase (O); performing ultrasonic emulsification on the internal water phase and the organic phase to form W / O primary emulsion; rapidly adding the primary emulsion into an external water phase (W2) containing PVA and NaCl to form a W1 / O / W2 type multiple emulsion, and then carrying out solvent evaporation curing, centrifugal washing and freeze drying to obtain PLGA (at) PG microspheres; and uniformly dispersing the PLGA (at) PG microspheres in a hyaluronic acid solution, adding into a microneedle mold, vacuumizing, centrifuging, drying, and demolding the microneedle to obtain the dissolution type microneedle patch. By optimizing microsphere preparation, drug sustained release and microneedle patch preparation technologies are realized, and an efficient, safe and continuous local delivery platform is provided.

The invention relates to a whitening and soothing composition, a nano microemulsion containing the same and a preparation method of the nano microemulsion. The whitening and soothing composition comprises a litchi fruit extract, a quercus root extract, a malt extract and palmitoyl tripeptide-5. According to the functional composition, the litchi fruit extract, the oak root extract, the malt extract and the palmitoyl tripeptide-5 are creatively combined for use, so that the functional composition has excellent skin whitening and soothing effects, and the four components have an obvious synergistic interaction effect in the aspects of whitening and soothing the skin; the functional composition can be widely applied to cosmetics with related functions. The nano micro-emulsion prepared from the functional composition is subjected to shearing emulsification and then high-pressure micro-jet treatment, so that the prepared nano micro-emulsion is better in stability and better in appearance property, and the nano micro-emulsion can stably play a role in whitening and relieving for a long time.

The invention relates to the technical field of functional materials, in particular to a chitosan nanocapsule as well as a preparation method and application thereof. The preparation method of the chitosan nanocapsule comprises the following steps: (a) mixing and emulsifying a chitosan solution, an oil-in-water emulsifier and essential oil to form an oil-in-water emulsion, adding an aqueous solution of sodium tripolyphosphate into the oil-in-water emulsion, and stirring to obtain a first mixture; (b) adding the first mixture into an oil phase solvent containing a water-in-oil emulsifier, and stirring to obtain a multiple emulsion; and (c) adding an aqueous solution of a dialdehyde cross-linking agent into the multiple emulsion, carrying out a cross-linking reaction, collecting a solid-phase substance, and drying. The physical / chemical double-crosslinking chitosan nanocapsule is obtained by utilizing physical crosslinking between the chitosan and the sodium tripolyphosphate and chemical crosslinking between the chitosan and the binary aldehyde crosslinking agent, so that the encapsulation efficiency and the encapsulation efficiency of the nanocapsule are remarkably improved; meanwhile, the nanocapsule also has pH responsiveness and has a slow release effect after pH response.

The invention provides a preparation method of a calcium emulsifying and embedding system with high bioaccessibility, which comprises the following steps: S1) heating and mixing biomacromolecules and an emulsifier in water to obtain a water phase; the biomacromolecules are protein colloids and / or polysaccharide colloids; the method comprises the following steps: heating and mixing a calcium source substance and anhydrous cream to obtain an oil-solid phase; and S2) mixing the oil-solid phase with a water phase, and emulsifying to obtain the calcium emulsifying and embedding system. Compared with the prior art, the preparation method has the advantages that the natural macromolecular protein and / or polysaccharide with high nutritional value is used as a carrier, the calcium source substance is embedded through a water-oil-solid three-phase emulsification technology, and the preparation method is simple, easy to operate, low in cost and environmentally friendly; in addition, a water-oil-solid three-phase homogenized emulsion is created, the problem that the dispersion stability of milk mineral salt in a liquid food matrix is poor is effectively solved, release of free calcium ions in the small intestine environment can be promoted, and the calcium bioaccessibility is remarkably improved.

The invention provides a water-blocking microcapsule, a fish oil composite hair beautifying ointment and a preparation method, and relates to the technical field of animal health products. The water-blocking microcapsule is a solid particle formed by a core material and a wall material coating the core material; the core material is fish oil emulsion subjected to bile salt emulsification treatment; the wall material sequentially comprises an inner-layer wall material and an outer-layer wall material from inside to outside; the inner-layer wall material is a wall material formed by solidifying alginate; and the outer-layer wall material is a water-blocking wall material which is arranged outside the inner-layer wall material and is made of nanocrystalline cellulose. The water-blocking microcapsule provided by the invention realizes multiple beneficial effects of efficient digestion and absorption of fish oil, improvement of palatability, enhancement of oxidation resistance and stability, fixed-point release of intestinal tracts and the like, provides an innovative technical scheme for development of animal health products, and has wide application prospects and market values.

The invention discloses application of a particle stabilizer, an oil-in-oil Pickering emulsion as well as a preparation method and application of the oil-in-oil Pickering emulsion, and relates to the technical field of emulsion preparation. The particle stabilizer is used for preparing the oil-in-oil Pickering emulsion, and the particle stabilizer is solid insoluble nanoparticles and is selected from one or more of inorganic nanoparticles, organic nanoparticles, composite oleophobic nanoparticles and stimuli-responsive nanoparticles. The preparation method of the oil-in-oil Pickering emulsion comprises the following steps: mixing the first oil phase, the second oil phase and the particle stabilizer, and carrying out an emulsification technology to obtain the oil-in-oil Pickering emulsion. According to the emulsion system prepared by the invention, the oil phase components with different polarity differences are reasonably matched, and the oil phase type is flexibly selected according to specific requirements of target application, so that the environmental adaptability and the function application range of the emulsion can be remarkably improved, and the emulsion system has a good application prospect.

The invention relates to Pickering emulsion, a preparation method and application thereof, and belongs to the technical field of emulsion preparation, and the preparation method comprises the following steps: S1, preparing a water phase: uniformly mixing and stirring gluten protein zymolyte obtained after gluten protein enzymolysis with polydextrose and a phosphoric acid buffer solution, heating in a water bath, and cooling to obtain the water phase; s2, preparation of an oil phase: dissolving fat-soluble active substances in edible oil to prepare the oil phase; s3, emulsion preparation: mixing the water phase and the oil phase, performing high-speed dispersion treatment, and homogenizing to obtain Pickering emulsion; the gluten protein zymolyte and the polydextrose conjugate are prepared by utilizing the Maillard reaction, and the emulsibility and the stability of the Pickering emulsion can be remarkably improved by taking the gluten protein zymolyte and the polydextrose conjugate as the emulsifier.

The invention provides moisturizing and anti-wrinkle cream and a preparation method thereof. The moisturizing and anti-wrinkle cream is prepared from the following raw materials in percentage by mass: 2%-10% of fibroin composite microsphere solution, 2%-5% of skin conditioner, 1%-2% of emollient, 8%-15% of humectant, 0.1%-1% of emulsifier, 1%-2% of emulsion stabilizer, 0.1%-0.2% of thickener and the balance of water. Wherein the fibroin composite microsphere is a spherical aggregate obtained by interpenetrating and entangling fibroin and poly-desoxyribonucleic acid in a cation environment and folding and compressing the fibroin and the poly-desoxyribonucleic acid; the composite microspheres can be percutaneously absorbed, and when the composite microspheres are applied to a formula of cream, the percutaneous permeation efficiency of the cream is greatly improved, and the moisturizing and anti-wrinkle effects of the cream are improved.

The application belongs to the technical field of plant raw material processing, and particularly relates to a preparation method of a blocky emulsion gel product simulating animal fat, which is formed based on a soybean protein and sodium alginate composite base and comprises the following steps: (1) mixing pure water, soybean protein and sodium alginate, then shearing at high speed, and dispersing and emulsifying in perilla oil; (2) adding gluconolactone, stirring and mixing, then immediately adding calcium carbonate while stirring, to form a first gel network; (3) after stirring, pouring into a mold for shaping, placing in a 4 DEG C refrigerator for gelation, forming a second protein network, and obtaining a simulated fat product with strong stability. The application forms a simulated fat with a complex double-network structure under the action of two kinds of inducing agents by constructing a protein-polysaccharide composite gel system, improves the stability and oiliness of the gel, and expands the cooking adaptability of the simulated fat.

The invention provides donepezil sustained-release microspheres and a preparation method, a pharmaceutical preparation and application thereof. The preparation method comprises the following steps: forming a water phase (containing a surfactant, an osmotic pressure regulator and water, and regulating the pH value with a pH regulator); forming an oil phase (comprising donepezil, a carrier material and an organic solvent); and adding the oil phase into the water phase, dispersing to form a pre-emulsion, performing membrane emulsification on the pre-emulsion to form an emulsion, and finally curing, washing and freeze-drying the emulsion to obtain the donepezil sustained-release microspheres. The preparation process is stable and controllable, the batch-to-batch repeatability is good, the surface of the microsphere is smooth and complete, the particle size distribution is uniform, the size is controllable, the microsphere has high drug loading capacity, long-term stable release can be realized, the injectability is excellent, the administration frequency can be reduced, and the adverse reaction of gastrointestinal tracts can be reduced.

The invention belongs to the technical field of daily necessities, and particularly relates to a high-absorption side-leakage-preventing 3D liquid sanitary towel and a preparation method thereof. A high-absorption side-leakage-prevention 3D liquid sanitary towel sequentially comprises a surface layer, an absorption layer and a leakage-prevention layer from top to bottom. The preparation method of the absorption layer comprises the following steps: (1) introducing a first oil phase, a water phase A and a water phase B into a first continuous emulsification device to obtain a first emulsion; (2) introducing the second oil phase, the water phase C and the water phase D into a second continuous emulsification device to obtain a second emulsion; and (3) coating the upper surface of a non-woven fabric with the first emulsion, coating the lower surface of the non-woven fabric with the second emulsion, performing illumination and steam treatment, and then performing dehydration and drying to obtain the absorption layer. The absorption layer of the liquid sanitary towel is high in flow conductivity and liquid absorption capacity, and the absorption capacity and the side leakage prevention capacity of the liquid sanitary towel are improved.

The invention discloses fluticasone propionate emulsifiable paste and a preparation method thereof. The preparation method of the fluticasone propionate emulsifiable paste comprises the following steps: S1, mixing liquid paraffin, isopropyl myristate and other auxiliaries, and heating to obtain an oil phase; s2, purified water, propylene glycol, disodium hydrogen phosphate dodecahydrate and other auxiliaries are mixed to obtain a water phase; and S3, adding the oil phase into the water phase, adding fluticasone propionate and the like after complete emulsification, uniformly stirring, and standing to obtain the cream. Compared with the prior art, the fluticasone propionate emulsifiable paste prepared by the invention is not easy to layer at high and low temperatures, and the obtained emulsifiable paste has better stability and is very beneficial to transportation, storage and the like of the product.

The invention discloses a phase-change cream composite material and a preparation method thereof. The phase-change cream composite material comprises the following raw materials in percentage by weight: 10-60% of a phase-change material, 1.5-7% of an emulsifier, 0-2% of a thickening agent, 4-10% of an emulsion stabilizer, 0.5-4% of phase-change gel, 0.05-0.2% of a preservative and the balance of water, the cream composite material is an oil-in-water system; the phase change material exists in a cream system in the form of dispersed gel droplets, and forms a continuous cream composite material with a water phase. The phase-change cream composite material prepared by the invention is high in stability, good in dispersity, good in softness and small in flowability, and different product forms can be designed according to cold compress and hot compress parts of a human body.

The invention provides a preparation method of fusidic acid emulsifiable paste, and relates to the field of pharmaceutical preparations, and the preparation method comprises the following steps: step 1, preparation of fusidic acid nanoparticles, step 2, preparation of an oil phase of the emulsifiable paste, step 3, preparation of a water phase of the emulsifiable paste, step 4, emulsification, and step 5, mixing. According to the fusidic acid nanoparticles, firstly, a composite carrier is prepared, then fusidic acid, PLGA, the composite carrier and absolute ethyl alcohol are mixed, a nanoparticle oil phase is obtained, then PVA, PVP, sodium dodecyl glucoside sulfonate and dipotassium ethylenediaminetetraacetate are mixed with deionized water, a nanoparticle water phase is obtained, and finally a nanoparticle suspension is obtained through mixing. The fusidic acid emulsifiable paste prepared by the method can effectively solve the problems that the traditional emulsifiable paste bulk drugs are easy to agglomerate, the drug molecule particle size is large and the like, and the transdermal absorption rate and bioavailability of fusidic acid are improved, so that the antibacterial effect is enhanced.

The invention discloses water-soluble soldering paste and a preparation method thereof. A soldering flux A comprises a solvent A, a rosin-based material, a thixotropic agent A, an active agent A, a corrosion inhibitor and a surfactant; the rosin-based material comprises at least one of acrylic acid modified rosin, hydrogenated rosin or polyoxyethylene rosin; the soldering flux B comprises a solvent B, a rosin derivative, an active agent B and a thixotropic agent B; the solvent B is a hydrophobic solvent; the rosin derivative comprises at least one of polyoxyethylene rosin amine and polyoxyethylene polymerized rosin; and the soldering flux A and the soldering flux B are compounded into an emulsion structure. Refrigerating the soldering flux A, taking out the soldering flux B, returning to normal temperature, mixing, and emulsifying for 5-10 minutes at the stirring speed of more than 1000rpm to obtain the soldering flux C; and 85-92% of soldering powder is added into 8-15% of the soldering flux C, vacuum uniform mixing is carried out at the stirring speed of 20-40 rpm, and the water-soluble soldering paste is obtained.

A composite oil phase and composite emulsion matrix for site-mixed emulsion explosive and preparation methods therefor. The composite oil phase is divided into material A and material B, wherein in the material A, a high-viscosity polyisobutylene maleic anhydride amine esterification derivative is used as a primary emulsifier to increase the strength and thickness of an emulsification film of an emulsion matrix, thereby improving the stability of the emulsion matrix; in the material B, a low-viscosity polyisobutylene maleic anhydride amine esterification derivative and SP-80 are used as primary emulsifiers to regulate the ammonium nitrate dissolution rate of the emulsion matrix, thereby improving the sensitization characteristic of the emulsion matrix; and the emulsion matrix prepared from two composite oil phases can effectively improve the water resistance of the emulsion matrix while the problems of high-temperature over-sensitization and low-temperature insensitivity are solved, so that the explosion quality is guaranteed.

Emulsion explosives with gas bubbles that are resistant to in-borehole migration or coalescence are disclosed herein. Such emulsions can be sensitized by mechanically-introducing gas bubbles into the emulsion. Resistance to gas bubble migration and coalescence can be achieved by homogenization, without the need for bubble stabilization agents.

The invention discloses a ceramide-containing composition as well as a preparation method and application thereof, and belongs to the technical field of daily chemical products and medicines. The composition comprises 0.1%-5.0% of ceramide, 1.8%-2.7% of an emulsifier, 1.2%-2.5% of an emulsion stabilizer, 8%-14% of a solvent, 3%-5% of an emollient and 0.7%-0.95% of a stabilizing aid, the composition obtained by compounding the components has high stability, and the phenomena of particle precipitation, oil-water separation and the like are avoided; meanwhile, all the components are mutually matched and have a synergistic effect, and the effects of fading, repairing and resisting wrinkles can be achieved.

The invention discloses a long-acting cool and refreshing lingering paste based on compound matrix slow release and a preparation method thereof, and belongs to the technical field of cosmetics. The ointment body comprises 20-24 parts of beewax, 35-40 parts of a substance with an HLB (Hydrophile-Lipophile Balance) value of 12-15, 28-35 parts of a freshener and 5-7 parts of a plant extract composition. The plant extract is embedded into the matrix in the form of nano emulsion by combining staged temperature control with a nano emulsion technology. The invention has the following effects: by regulating and controlling the proportion of the beewax and the esters with high HLB (Hydrophile Lipophile Balance) value, a honeycomb porous structure is formed, and the body temperature triggered slow release of high-concentration cooling components is realized; through a low-temperature gradient process, staged temperature control (melting-> 40 DEG C emulsification) is combined with a nano-emulsification technology, and the activity of volatile components is retained (the retention rate gt is 98%). The product provided by the invention has the advantages that the cooling feeling lasts for 4-6 hours, the irritation is obviously lower than that of similar products, and the product is suitable for non-face resident type cooling and refreshing nursing for adults.

The invention discloses a preparation method of a fluoride-free oil-proof agent for paper pulp molding, and relates to the field of oil-proof agent preparation. The preparation method comprises the following steps: adding a nonionic and cationic surfactant, a thickening agent, a bio-based functional additive, a cross-linking agent and a polymerizable siloxane coupling agent into water, heating and stirring, emulsifying with molten wax, homogenizing at high pressure, then adding a preservative and an anti-settling agent, and reacting at room temperature to obtain the wax emulsion with small particle size and stable structure. The prepared product has excellent storage stability, oil-proof performance and washable performance, does not stratify after centrifugation and long-term storage, and meets the green and environment-friendly requirements.

The embodiment of the invention provides narrow-distribution PLA (polylactic acid) microspheres as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving a PLA material in an organic solvent to obtain a dispersed phase; based on the total volume of the dispersion phase, the concentration of the PLA material in the dispersion phase is 60-300 mg / mL; dissolving polyvinyl alcohol in hot water to obtain a continuous phase; the mass concentration of the polyvinyl alcohol in the continuous phase is 1.5-5% by taking the total weight of the hot water as 100%; enabling the dispersed phase and the continuous phase to form a stable primary emulsion by adopting a porous membrane tube through a membrane emulsification method; stirring the primary emulsion under an ice bath condition at the temperature of 10 + / -2 DEG C to obtain a cured emulsion; and sequentially centrifuging, screening, collecting and freeze-drying the cured emulsion to obtain the narrow-distribution PLA microspheres. The PLA microspheres prepared by the preparation method provided by the invention are smooth and regular in surface, free of cracks, not easy to adhere, narrow in particle size distribution and high in yield.

The present invention provides a cheese product and a preparation method thereof, and relates to the technical field of dairy products. The protein cheese product of the present invention comprises the following components by mass: 50-90 parts of cheese, 1-10 parts of protein components, 0.5-5 parts of starch, 0.1-1 parts of emulsifying salts, 0.1-0.5 parts of fermented whey powder, 0-0.5 parts of guar gum, 0.1-0.5 parts of locust bean gum, 0.05-0.3 parts of emulsifiers, 0.05-0.5 parts of cream and 3-30 parts of raw milk. The protein cheese product prepared by the present invention meets the needs of consumers for healthy diets while maintaining the flavor and taste of cheese.

The invention relates to the technical field of colloid and interface chemistry, in particular to an oil-in-water-in-oil double emulsion, a one-step preparation method of the oil-in-water-in-oil double emulsion and application of the oil-in-water-in-oil double emulsion. A water phase and an oil phase are sheared and stirred at a high speed of 6000-12000 r / min through a one-step process to form an emulsion with a droplet diameter of 1-100 [mu] m. According to the invention, the tedious process of respectively stabilizing the inner and outer oil-water interfaces of the double emulsion through two emulsifiers with different hydrophilic and oleophylic properties in a traditional two-step method is effectively improved, and the O / W / O double emulsion is directly obtained through a one-step process, so that the purpose of simultaneously stabilizing the inner and outer emulsion interfaces of the double emulsion through a single emulsifier is achieved; the method has a huge potential application prospect in the fields of food packaging, drug sustained release and the like.

The invention relates to the field of essence preparation, in particular to microcapsule essence and a preparation method thereof.The microcapsule essence is prepared from, by mass, 30-50 parts of essential oil, 20-30 parts of spice, 15-25 parts of wall materials, 5-10 parts of emulsifier and 3-5 parts of auxiliaries. The preparation method comprises the following steps: modifying spices, compounding composite Arabic gum and composite gelatin according to a specific ratio to obtain a wall material, mixing an oil phase, preparing a wall material solution, preparing an emulsified wall material solution, forming an emulsion, adding auxiliaries, stirring, spraying or freeze-drying to obtain the finished microcapsule essence. The product disclosed by the invention is excellent in aroma retention, particle size, thermal stability and oxidation resistance, effectively solves the problems of volatilization, processing loss, short aroma retention and the like of the traditional essence due to cooperation of a reasonable raw material formula and a fine process, is widely applied to the fields of foods, daily chemicals, textiles and the like, and has a great application prospect.

The application discloses a preparation method of a high internal phase emulsion stabilized only by proteins, which mixes a completely hydrated protein solution as a water phase with an oil phase, and controls the hydrodynamic characteristics of a shearing emulsification process to obtain the high internal phase emulsion stabilized only by proteins. The preparation method of the application can obtain the high internal phase emulsion stabilized only by food-grade proteins through one-step shearing emulsification without other measures. The prepared high internal phase emulsion has good gel characteristics, stability and high safety, and can be used as a substitute for partially hydrogenated vegetable oil and saturated fatty acids. Meanwhile, the method is simple in operation, low in preparation cost and suitable for large-scale industrial promotion.

The invention relates to the field of welding solder paste, and discloses high-connection-strength lead-free solder paste and a preparation method thereof. The high-connection-strength lead-free solder paste is prepared from 88 wt%-92 wt% of soldering tin powder and 8 wt%-12 wt% of scaling powder. The scaling powder is prepared from 10 wt%-20 wt% of rosin auxiliaries, 8 wt%-15 wt% of organic acid active agents, 5 wt%-8 wt% of thixotropic agents, 3 wt%-6 wt% of surface active agents, 2 wt%-5 wt% of antioxidants and the balance solvent. The rosin additive is prepared from polymerized rosin, hydrogenated rosin pentaerythritol ester and hydrogenated abietinol; the thixotropic agent is prepared from modified hydrogenated castor oil and ethylene bis lauramide. The preparation method comprises the following steps: S1, emulsifying and grinding the rosin aid, the organic acid active agent, the thixotropic agent, the surfactant, the solvent and the antioxidant to obtain the soldering flux; and S2, the soldering tin powder and the soldering flux are stirred and dispersed. The welding solder paste prepared by the invention has relatively good connection strength and stability, is not easy to break, and is suitable for fine chip packaging.