314results about How to "Low gas production" patented technology

The invention relates to a laser sintering sand, a preparation method thereof, a sand core and the preparation method thereof. The laser sintering sand consists of a first component and a second component which are evenly mixed, the first component consists of a first type of raw sand with the coefficient of angularity of less than 1.3, thermosetting resin and additives, wherein the thermosetting resin and the additives are coated on the surface of the first type of the raw sand; and the second component consists of a second type of raw sand with the coefficient of angularity of less than 1.1, a thermoplastic material and the additives, wherein the thermoplastic material and the additives are coated on the surface of the second type of the raw sand. The adoption of the laser sintering sand does not need to add an auxiliary support structure during the laser sintering process, thereby improving the molding efficiency and reducing the manual intervention; and the any complex sand core can be manufactured without using a mold, and the sand core simultaneously has high sintering initial strength and can meet the requirements on the thermal strength and the gas-generating capacity of the sand core during the metal casting process.

The invention discloses a preparation method of molding sand for gray iron casting, comprising the following three steps: preparing raw materials, preparing the molding sand, and mixing the molding sand. The preparation method has the advantages of simple process steps, easy operation, no use of coal dust, clean workshop, little pollution, and low cost and environmental protection by using straw powder, modified starch and other renewable raw materials. The prepared molding sand has small gas content, short drying time, good permeability and high baked tensile strength in casting, and can improve the releasability of the sand mold, further improving the fineness of casts.

A cohesion agent for casting module and making core is provided, which is characterized in that: the mass per centage ration of the main chemical component of the cohesion agent is SiO2, 23 to 31, K2O 0.5 to 28, Na2O 1 to 21, modifying agent 0.5 to 21 and excess water. Wherein, the modifying agent chooses one or two in sorbierite, xylitol, mannite, maltitol, glycol, propanediol, glycerol, pentaerythritol, diglycol, propylene glycol, carbowax, PPG and polyglycerol, the adding volume is 0.5 to 21 per cent. When using the cohesion agent to prepare sand mole core, the dosage is little, the old sand can be recycled and the prepared core has good collapse performance.

The invention relates to a centrifugal casting roller coating and a preparation method thereof. The centrifugal casting roller coating is characterized by comprising the following compositions in percentage by mass: 12 to 15 percent of zircon powder, 8 to 10 percent of quartz powder, 8 to 10 percent of bauxite, 0.3 to 0.6 percent of silica sol, 0.1 to 0.4 percent of sodium carboxymethyl cellulose, 0.15 to 0.35 percent of alkyl benzene sodium sulfonate, 0.15 to 0.35 percent of sodium sulfate, 0 to 0.02 percent of n-butyl alcohol, 0 to 0.02 percent of n-octyl alcohol, 0.10 to 0.18 percent of fatty alcohol polyethenoxy ether, and the balance being water, wherein the mass percentage of the zircon powder + the quartz powder + the bauxite is more than or equal to 30 percent and less than or equal to 35 percent, the mass percentage of the alkyl benzene sodium sulfonate + the sodium sulfate is more than or equal to 0.35 percent and less than or equal to 0.55 percent, and the mass percentage of the n-butyl alcohol + the n-octyl alcohol is more than or equal to 0.02 percent and less than or equal to 0.03 percent. The coating is used for centrifugal casting roller production after stirring, grinding and sieving, and has good use effect.

The invention relates to a sintering-strippable low-cost red water-based cast iron coating, which is prepared by the following raw materials in percent by mass: 20-45 percent of bauxite powder or powder quartz, 0-25 percent of mullite powder, 1-6 percent of talcum powder, 1-5 percent of iron trioxide powder, 1-3 percent of suspending agent, 1.5-4.5 percent of organic binding agent, 1.5-6 percent of inorganic binding agent, 0.01-0.05 percent of wetting agent, 0.02-0.05 percent of preservative, 0.02-0.1 percent of defoaming agent, 0-0.5 percent of water reducing agent and 30-42 percent of tap water. The sintering-strippable low-cost red water-based cast iron coating has the characteristics that the raw materials are cheap and the source is wide; the product is low-cost, safe, environmental-friendly and convenient to transport; the brushing property, the flowing resistance and the leveling property of the product are good, the suspension percentage, the coating strength and the crack resistance are high and the gas evolution is low; and the sintering-stripping performance is excellent, the most part of the coating can be vastly stripped after castings are taken out of a casting box and are cooled, the defects of sand sticking, sand inclusion, sand drop, voids and the like existing the castings can be effectively avoided, and the castings with excellent surface quality can be obtained.

The invention discloses a zircon power alternative coating for casting, which is characterized in that a coating composition comprises carrier liquid consisting of isopropyl alcohol, toluene and ethanol, a suspending agent consisting of organobentonite and attapulgite, an adhesive consisting of thermoplastic phenolic resin and rosin, and refractory aggregate consisting of white alundum powder and andalusite powder. The coating composition comprises the following components by weight percent: 6-10 percent of isopropyl alcohol, 2-4 percent of toluene, 6-10 percent of ethanol, 0.5-1.5 percent of organobentonite, 1-2 percent of attapulgite, 0.2-1.0 percent of thermoplastic phenolic resin, 0.2-1.0 percent of rosin, 15-55 percent of white alundum powder and 15-55 percent of andalusite powder. Compared with the conventional common cast steel zircon power coating, the coating has high thixotropy and leveling property, is smooth and dense and has enough normal temperature and high-temperature strength, so that the casting roughness meets the quality requirement; and moreover, the zircon power alternative coating is low in gas outlet quantity and has proper shielding property, and the defects of the casting air holes can be obviously reduced.

The invention discloses casting coated sand suitable for selective laser sintering forming and a manufacturing method thereof. The coated sand is made from roughing sands, an organic binder, an inorganic binder, a coupling agent and a curing agent, further, additives, such as a lubricant, a light absorber and the like are not required; and the roughing sand is spherical pearl sand with the angular coefficient less than or equal to 1.1, wherein the sand grains consist of adjacent four-sieve sands or five-sieve sands. The manufacturing method of the casting coated sand comprises the following steps of: sieving the roughing sands to obtained the required four-sieve sands or five-sieve sands; carrying out thermal coating on the roughing sands by using phenolic resin powder, the coupling agentand the curing agent according to a certain proportion so as to obtain phenolic resin coated sand; and evenly mixing monoammonium phosphate fine powder and the phenolic resin coated sand which are ina certain proportion to obtain the casting coated sand suitable for the selective laser sintering forming. The coated sand laser sintering forming part has high preform strength, good forming accuracy and little gas forming amount and can be applied to a casting sand mold (core) with an intricate structure in laser fast forming, therefore, the fast trial-production and the manufacturing capacity of intricate castings are enhanced.

The invention discloses easy-to-fill precoated sand and a preparation method thereof. Raw materials comprise roughing sand, phenolic resin, curing agents, lubricating agents and additives. The preparation method comprises the following steps that the roughing sand is heated to 130 to 170 DEG C, then, the phenolic rein, a half quantity of the lubricating agents, the curing agents and the rest half quantity of lubricating agents are sequentially added, finally, the discharging is carried out, and then, crushing, sieving and package are carried out. Through the improvement on the raw material ingredients and the preparation process, the forming intensity of the precoated sand is high, the high-temperature intensity is high, the deformation quantity is small, the flowability is good, complicated sand cores can be produced, the surface smoothness of the molding sand is good, the collapsibility performance is excellent, castings can be easily subjected to the vibration sand falling treatment, the precoated sand gas producing quantity is reduced, and the high-temperature performance and other casting performance of the precoated sand are improved.

The invention relates to a precoated sand for a casting field, in particular to a 3D printing precoated sand. The 3D printing precoated sand comprises the following components: 5-8 wt% of cashew nut shells, 1-2 wt% of melamino-formaldehyde resins, 1-5 wt% of cashew nut shell liquid modified phenolic resins, 0.6-0.8 wt% of urotropin, 0.1-0.4 wt% of lubricant, 0.1-0.8 wt% of binding agents, 0.1-0.4 wt% of coupling agents, 0.5-1 wt% of dispersing agents, and the balance of crude sands. The prepared 3D printing precoated sand has high strength, high-temperature resistance, low gas generating amount and low expansion rate.

The invention belongs to the field of casting, and particularly relates to high-strength, deformation-resisting and collapsible precoated sand and a preparation technology thereof. The precoated sand and the preparation technology aim to solve the technical problem that a sand core made of precoated sand according to a ratio is low in strength and prone to deformation. The high-strength, deformation-resisting and collapsible precoated sand is composed of crude sand, phenolic resin, curing agents, lubricants and disperser, wherein the crude sand is composed of 20%-30% of nice foundry sand and 70%-80% of quartz sand, the addition quantity of the phenolic resin is 0.9%-1.2% of the mass of the crude sand, the addition quantity of the curing agents is 9%-13% that of the phenolic resin, the addition quantity of the lubricants is 0.1%-0.15% of the mass of the crude sand, and the addition quantity of the disperser is 0.05%-0.4% of the mass of the crude sand. The invention further provides the preparation technology of the precoated sand. The precoated sand has the advantages of high temperature and normal temperature strength, high deformation resistance, good formability, easy collapsibility, good mobility and low gas-forming amount, and completely meets the production technology requirements of an engine with complex structure and high performance.

The invention discloses energy-saving type water group lost mould casting paint, which comprises a fireproof material, an adhesive, a suspension agent, an auxiliary agent and water, wherein the fireproof material is a composite fireproof material and comprises bauxite, zircon flour and pagodastone in parts by weight according to the mixture ratio of 20-40:60-80:5-10. The paint comprises the following components according to the mixture ratio, by weight percent: 60-80% of composite fireproof material, 0.5-3% of adhesive, 1-2% of suspension agent, 0.5-2% of auxiliary agent and the balance of water. The paint adopts the composite fireproof material under a precondition of ensuring the fire resistance of the paint, and the consumption of resource type materials in the lost mould paint is greatly reduced; the mixture ratio of the mixed paint of the invention can induce the high-temperature encrustation of the paint, the paint is easy to strip off from a cast, the energy consumption of sand removal is reduced, and the possibility of the generation of diversified defects at the surface of the cast is also reduced by the flaky stripping of a sintered paint layer during sand removal. Moreover, the pollution action of the components of the paint to the environment is also reduced greatly by adopting the phosphate auxiliary agent.

The invention belongs to the technical field of casting, and in particular, relates to high-temperature resistant precoated sand. The high-temperature resistant precoated sand comprises the following components in parts by weight: 100 parts of crude sand, 12-15 parts of adhesive, 2-5 parts of curing agent, 8-10 parts of coupling, 1-3 parts of lubricating agent, 5-10 parts of zirconium quartz powder and refractory fiber mixture, and 0.2-0.35 part of tantalum oxide. As the zirconium quartz powder and refractory fiber mixture is added in the precoated sand, and tantalum oxide serves as an additive, the total refractory durability and the self structure stability of the precoated sand are collaboratively improved, the tensile strength of the precoated sand is greatly improved above 8 MPa, the gas generating quantity is lower than 15, and the application prospect is broad.

The invention discloses molding sand for casting gray iron, and the molding sand comprises the following components in parts by weight: 93-95 parts of old sand, 2-4 parts of new sand, 0.3-0.8 part of bentonite, 3.6-6.5 parts of auxiliaries and 5-8 parts of water, wherein the preparation method of the auxiliaries comprises the following steps: weighing the following raw materials by weight percent: 60-70% of modified starch, 1.5-2.5% of glycerin, 2-5% of sodium bicarbonate, 10-15% of ferric oxide powder, 5-8% of straw powder and the balance of the water, adding the well weighed raw materials into a reaction kettle, stirring, mixing, heating to 80-85 DEG C, continuing for 1-2 hours, then pouring out the mixed materials in the reaction kettle, air-drying or drying and processing into powder so as to prepare the auxiliaries.

The invention relates to a regeneration method of casting wet type mixed old sand. The regeneration method comprises the following steps: preprocessing casting wet type mixed old sand; wiping with water; drying; preheating; roasting; and post-processing. In the invention, components, such as bentonite, coal dust and ashes, in wet type old sand are effectively removed by a water wiping process, and a residual resin film in mixed old sand is thoroughly decomposed by a roasting process. The regeneration cost is low, and the regeneration effect is great. Actual production and verification show that the performance indexes of regenerated sand reach or surpass those of new sand. The regeneration method is successively applied to the core making production of cold boxes and has remarkable economical and social benefits.

The invention relates to a phosphate binder used for casting, which comprises the components by weight ratio: 45 to 55 percent of phosphoric acid, 33 to 45 percent of aluminium dihydrogen phosphate, 5 to 15 percent of boric acid and 6 to 12 percent of citric acid. The binder can also be mixedly matched with 0.5 to 2 percent of magnesium oxide curing agent by weight ratio. The binder adopts the phosphoric acid and the aluminium dihydrogen phosphate as a binder main body, and is added with the boric acid and citric acid for improving the bonding property, thus being one phosphate binder with good property used for casting. The binder has the advantages of low cost, little environmental pollution, high hot strength, good collapsibility and the like, can improve working environment to the utmost extent, and reduce production cost.

The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.

The invention discloses preparation of coated sand by the use of a phosphate inorganic binder and a molding method thereof. Preparation of the coated sand comprises the following steps: uniformly mixing the phosphate inorganic binder and quartz sand; heating and drying to a semi-dry state; adding calcium stearate with the granularity being 600 meshes and uniformly mixing; and drying and cooling so as to obtain the phosphate inorganic binder coated sand which is in a dry arenaceous state. During molding of the coated sand, the coated sand undergoes hydration only by high temperature steam, the binder is dissolved, sand grains are connected, and finally hot-air is blown for drying and curing molding. The hardening speed is fast. During preparation and curing molding of the coated sand, smell or any harmful gas or substance is not generated. The sand mould has low gas-forming property, is harmless to the health of workers, causes no pollution to the environment and is energy-saving and environmentally friendly. The coated sand provided by the invention has characteristics of high strength, high temperature resistance, low gas evolution, no curing agent required for molding and good storage stability.

The invention discloses a high-melting metal liquid die forging coating, a preparation method and a using method thereof, which can effectively solve the problem of short service life of a high-melting metal liquid die forging die. A bottom layer and a surface layer are consists of 100 portions of 200-500 mesh matrix, 100-300 portions of carrier, 2-25 portions of a cementing agent, 0.1-25 portions of suspending agent and 0.01-0.05 portion of foam suppressor. The matrix of the surface layer coating is forsterite or chromite, while the matrix of the bottom layer coating is processed diatomite. The suspending agent is the mixture of sodium bentonite and CMC sodium salt. The cementing agent of the surface layer coating is the mixture of aluminum phosphate and sodium hexametaphosphate, while the cementing agent of the bottom layer coating is the mixture of soluble glass and sodium hexametaphosphate. The components are evenly blended according to the proportion and stand for 3-8 hours to be ready for use. When in use, the bottom layer coating is coated on the surface of a metal die which is preheated to the temperature of 150-300 DEG C; after drying, the surface layer coating is coated on the bottom layer coating, and then liquid die forging is carried out after drying.

The invention relates to a mold releasing coating for a centrifugal casting and a painting method of the mold releasing coating, in particular to a mold releasing coating for a nuclear power station main pipe in the centrifugal casting and a painting method of the mold releasing coating. The mold releasing coating comprises a base coating and a surface coating, wherein the base coating is used for coating the surface of a cast mold, and the surface coating is used for coating the base coating layer on the surface of the cast mold. The base coating comprises a component A, a component B, a component C and a component D, wherein the component A is graphite powder, the component B is bauxite or kieselguhr, the component C is talcum powder, and the component D is silica solution or aluminum phosphate. The surface coating comprises a component E, a component F, a component G, a component H and a component I, wherein the component E is quartz powder or high-aluminum powder or zirconium oxide powder, the component F is zirconium silicate powder or zircon powder or emery powder or bauxite, the component G is silica powder or kieselguhr, the component H is boracic slag powder, and the component I is a hydroxymethyl cellulose water solution or polyacrylamide hydroxyl or sodium alginate.

The invention discloses a carbon fiber-based precoated sand material for selective laser sintering and a preparation method thereof. The carbon fiber-based precoated sand material comprises chopped carbon fibers, crude sand, an organic binder, a curing agent, a lubricant, a coupling agent and a dispersant. The preparation method comprises the following steps of carrying out surface modification treatment on the chopped carbon fibers, heating the crude sand, adding resin, adding a part of calcium stearate and a prepared coupling agent aqueous solution, adding a chopped fiber-containing urotropine curing agent, adding the rest of the calcium stearate, carrying out cooling and carrying out screening and sand discharge to obtain the product. The carbon fiber-based precoated sand material has the advantages that 1, the carbon fibers have thermal conduction effects, limit integral shrinkage of a sintered part to a certain degree and reduce warp phenomenon in molding, and 2, through laser sintering, the precoated sand substantially improves resin precoated sand thermostability, promotes curing reaction of phenolic resin at locals in the sintered layer and between the sintered layers and obviously improves laser sintering forming part blank strength.

The invention is directed to a method of making a small crystal SSZ-32 zeolite, known as SSZ-32X. The catalyst is suitable for use in a process whereby a feed including straight chain and slightly branched paraffins having 10 or more carbon atoms is dewaxed to produce an isomerized product, with increased yield of isomerized material and decreased production of light ends.

The invention discloses shelling resistant pre-coated sand and a preparation method thereof. The shelling resistant pre-coated sand is characterized by comprising raw sand, a bonding agent the weight of which is 1-4% that of the raw sand, a curing agent the weight of which is 1-15% that of the bonding agent, 0.1-0.5% of coupling agent and 0.1-1.0% of additive. By adding the additive, the curing speed of the curing agent to the bonding agent is increased, the hardening rate of the pre-coated sand is improved and the shelling tendency is reduced; by optimizing the content of each component, the overall strength of the pre-coated sand is improved, the gas evolution amount of the pre-coated sand is greatly reduced and the defect of core piercing is alleviated; the shelling resistant pre-coated sand has strong shell resistance, is high in strength and low in gas evolution amount, is capable of remarkably alleviating or eliminating defects such as shelling and core piercing and effectively improving qualities of the inner and outer surface of a shell core, and is suitable for production of shell core sand cores.

The invention discloses pre-coated sand with high strength and a low gas evolution rate and a preparation method thereof. The pre-coated sand with high strength and low gas evolution rate is prepared from the following raw materials in parts by weight: 60-80 parts of quartz sand, 15-20 parts of celestite, 5-10 parts of wollastonite, 0.4-0.8 parts of ethenyl tri(beta-methoxyethyoxyl) silane, 4-6 parts of pentaerythritol oleate, 3-5 parts of epoxy soybean oil, 2-3 parts of nano magnesium oxide, 0.5-1.5 parts of bisphenol A epoxy resin, 1-2 parts of thermosetting phenol resin, 3-6 parts of diaminodiphenyl methane, 5-10 parts of urotropine, 4-8 parts of calcium stearate and 3-5 parts of composite powder. Compared with the conventional pre-coated sand, the pre-coated sand disclosed by the invention is not only high in strength, good in heat resistance, good in mobility and small in roughness, but also good in gas permeability and low in gas evolution rate, so that a casting piece can be effectively prevented from generating defects such as pin holes, nitrogen gas holes and burnt-on sand, and therefore, the yield of the casting piece is greatly improved.

The invention relates to a process for roasting waste sand into a precoated sand material. The process comprises the steps of shakeout, magnetic separation, crushing, screening, magnetic separation, roasting, dedusting, cooling and storage. When crushed and magnetically separated sand is roasted, the sand is required to be fed into a preheater for preheating, and then is fed into a roasting furnace for roasting. A passage for bearing the sand is stepped when the sand is in the preheater, the sand in the stepped passage is in a flocculated flow state, and when the sand is roasted, natural gas is jetted from three direction-adjustable jet tips in the roasting furnace to process the sand. Before being roasted, the sand is required to be preheated, so that the high-temperature heat exchange time of the sand in the roasting furnace is short, and the roasting efficiency and the roasting quality are improved. The sand is roasted at high temperature by the natural gas, so that the generation of an inert gas during the roasting is avoided. In addition, the three adjustable natural gas jet tips are adopted, so that the sand can be uniformly heated when roasted.

The invention discloses alcohol-group dry powder sand mould foundry coating, which comprises the following components in percentage by weight: 60-75% of bauxite, 2-10% of amorphous graphite, 3-15% of lamellar graphite, 2-10% of iron oxide red, 1-5% of attapulgite, 0.5-1.5% of sodium bentonite, 1-5% of polyvinyl butyral, 0.1-0.5% of surfactant and 0.1-0.5% of dispersing agent. The dry powder coating has the advantages of simple preparation technology, convenience in use and good high-temperature sand adhesiveness resistance.

The invention relates to a wear-resisting alloy hammer head and a preparation method thereof. The hammer head is characterized in that a strip-shaped gap is formed in the middle of an end part of the hammer head; the strip-shaped gap is as long as a hammer end and is 12-20 mm wide; and the depth of the strip-shaped gap is equal to the distance from the top of the hammer end to the bottom of the hammer end and is 25-30 mm. Since the end part of the hammer head is hollowed out in a thickness direction to form a 12-20 mm space, when the hammer head crushes materials, fine materials can easily pass through the space; and if large materials are embedded in the space, the effect that materials strike materials can be realized, and accordingly the crushing efficiency is improved. A wear-resisting high-Cr white cast iron piece can be embedded in the 12-20 mm space to form a composite hammer head, so that the service life of the wear-resisting alloy hammer head can be further prolonged.

The present invention is technological process of producing artificial casting sand and its application. The artificial casting sand is produced with bauxite ore containing Al2O3 in 45-90 % as material in an arc furnace. Bauxite ore material is first smelted in an arc furnace, and the outflow liquid is applied with air pressure of 3.0-8.0 kg / sq cm to be crushed, so that spherical casting sand with smooth surface is obtained. The artificial casting sand may be used for molding together with furan resin, phenolic resin, water glass, etc. The present invention has the features of environment friendship, high heat resistance, high strength, low heat expansion, low production cost, etc.

Mud core moulding sand for casting is prepared by the following raw materials including, by weight, 200-240 parts of quartz sand, 30-35 parts of attapulgite, 50-55 parts of perlite, 30-35 parts of sepiolite, 12-17 parts of glass fibers, 30-40 parts of alumina, 2-3 parts of aminopropyltriethoxysilane, 10-12 parts of cellulose gum, 1-2 parts of stearoyl-rac-glycerol, 2-3 parts of epoxidized triglyceride and water in proper amount. By using quartz sand, attapulgite and perlite and through calcining, rich holes are provided, and air permeability is good; by combining with grinding of sepiolite, alumina, cellulose gum and the like, the moulding sand is enabled to have excellent cohesiveness, plasticity and thermal stability; by adding the glass fibers, strength of the moulding sand is enabled to be greatly improved. The mud core moulding sand for casting has the advantages of high dry and wet strength, good air permeability, low gas evolution, quickness in calcining and curing and low mud core scrappage.

The invention discloses a paint formula, particularly discloses a lost foam steel-casting paint formula and a technology method thereof. The lost foam steel-casting paint formula comprises the following components: 40-60% of bauxite, 30-50% of zirconium sand powder, 1-3% of phenolic resin, 1-5% of white emulsion, 1-5% of silica sol, 1-5% of lithium bentonite, 0.1-0.5% of isopropanol, 0.5-2% of CMC and 0.1-0.5% of JFC. The technology method of the lost foam steel-casting paint formula comprises the following steps: 1, in the ratio of paint powder to water of 1:0.7, putting the paint powder and the water into a stirrer for stirring for 1-1.5 hours, then measuring baume degree, and controlling the baume degree between 65 and 70 through dilution with water; 2, according to production requirements, dip-coating for two times or three times; and 3, the thickness of a coating layer being 1-2 mm. White molds of the paint formula have good wettability, good coating and hanging properties, high strength and good air permeability.

The invention relates to casting sand core repairing paste and a preparation method of the casting sand core repairing paste. The casting sand core repairing paste comprises the following components in percentage by weight: 65%-70% of washed-out sand, 8%-10% of fine sand, 3%-5% of pregelatinized starch, 2%-3% of sodium bentonite, 0.2%-0.5% of cellulose, 0.1%-0.5% of fatty alcohol-polyoxyethylene ether and the balance of water. The preparation method comprises the following steps: preparing cellulose turbid solution from the cellulose and the water; preparing sodium bentonite solution from the sodium bentonite and the water, and adding the cellulose turbid solution, so as to prepare a suspension solution; adding the prepared suspension solution, the water and the pregelatinized starch into a high-speed stirring kettle, uniformly stirring, adding the fine sand, the washed-out sand and the alcohol-polyoxyethylene ether into the high-speed stirring kettle, and uniformly stirring, so as to obtain the casting sand core repairing paste. The preparation method has the advantages that the preparation process is simple, raw materials are easily available, the gas evolution is low, pores are reduced, the repairing paste and a sand core are synchronously scattered, castings are easy to clean, and a sand adhering phenomenon is prevented.